Backlight module and display device

Abstract

The invention discloses a backlight module and a display device, and relates to the technical field of display. Due to the fact that part of the light rays of the first color emitted by the light emitting diode in the backlight module can be converted into the light rays of the second color through the color conversion structure, the light rays emitted by the backlight module are the other part of combined light rays of the light rays of the first color and the light rays of the second color which are not converted. Namely, the backlight module realizes light emission in a mode of combining 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, due to the fact that the color conversion structure is located in the first containing groove of the substrate, namely, the color conversion structure is embedded into the substrate, the overall thickness of the backlight module can be reduced, thinning of the display device can be achieved conveniently, and the competitiveness of the display device in the display field is improved.

Description

Technical Field

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

[0002] 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 to realize display.

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

[0004] However, the backlight module in the related art is relatively thick, which makes it difficult to achieve thinning of the display device and has low competitiveness in the display field. Summary of the invention

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

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

[0007] A substrate, wherein a first side of the substrate has a first receiving groove;

[0008] A plurality of light emitting diodes, the plurality of light emitting diodes being configured to emit light of a first color;

[0009] a color conversion structure, the color conversion structure being located in the first receiving groove and being used for converting part of the light of the first color into light of a second color, the second color being different from the first color;

[0010] Wherein, the 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 receiving groove and on the first side of the substrate; and the backlight module further includes:

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

[0013] The second reflective layer is located on the first side of the substrate and between the substrate and the plurality of light-emitting diodes. The second reflective layer has an opening for allowing light of a first color emitted by the light-emitting diode to pass through the opening and illuminate the color conversion structure in the first receiving groove.

[0014] Optionally, the first color is blue;

[0015] The color conversion structure comprises a plurality of first color conversion parts and a plurality of second color conversion parts which are spaced apart, the color conversion material of the first color conversion part is red, and the first color conversion part is used to convert part of the blue light into red light, the color conversion material of the second color conversion part is green, and the second color conversion part is used to convert part of the blue light into green light; or, the color conversion structure comprises a first color conversion layer and a second color conversion layer which are stacked, the first color conversion layer is closer to the light emitting diode 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] or,

[0017] The color conversion structure includes a plurality of third color conversion parts arranged at intervals, the color conversion material of the third color conversion parts is yellow, and the third color conversion parts are used to convert 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 to convert 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 at 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 micron.

[0020] Optionally, the first color is blue; the color conversion structure comprises a fourth color conversion part and a fifth color conversion part which are arranged at intervals, the color conversion material of the fourth color conversion part is red, the fourth color conversion part is used to convert part of the blue light into red light, the color conversion material of the fifth color conversion part is green, the fifth color conversion part is used to convert part of the blue light into green light;

[0021] The backlight module also includes: a scattering structure located in the first receiving groove and between the fourth color conversion part and the fifth color conversion part, wherein light irradiated to the scattering structure can be transmitted by the scattering structure to the area where the fourth color conversion part or the fifth color conversion part is located.

[0022] Optionally, the opening has a first area and a second area, an orthographic projection of the first area on a reference plane covers an orthographic projection of the fourth color conversion portion on the reference plane, an orthographic projection of the second area on the reference plane covers an orthographic projection of the fifth color conversion portion on the reference plane, and the reference plane is parallel to a carrying surface of the substrate;

[0023] The backlight module also includes: a second grating structure and a third grating structure, each of the second grating structure and the third grating structure has a plurality of grating slits, the second grating structure is located in the first region, and the grating period of the second grating structure is 430 to 470, the third grating structure is located in the second region, and the grating period of the third grating structure is 400 to 430, and the grating period is used to indicate the number of grating slits set within a length range of 1 micron.

[0024] Optionally, the first accommodating groove includes 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 color conversion structure close to the first side of the substrate and a surface of the first side of the substrate to a depth of the first groove is in a range of 1 / 5 to 3 / 5;

[0025] Wherein, the plurality of light emitting diodes are located outside the first containing groove and on the first side of the substrate.

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

[0027] Optionally, the first color is blue;

[0028] The color conversion structure includes a plurality of sixth color conversion parts and a plurality of seventh color conversion parts, each of the first grooves is provided with one of the plurality of sixth color conversion parts and the plurality of seventh color conversion parts, the color conversion material of the sixth color conversion part is red, and the sixth color conversion part is used to convert part of the blue light into red light, the color conversion material of the seventh color conversion part is green, and the seventh color conversion part is used to convert part of the blue light into green light;

[0029] or,

[0030] The color conversion structure has a plurality of eighth color conversion parts, one of the plurality of eighth color conversion parts is disposed in each of the first grooves, the color conversion material of the eighth color conversion part is yellow, and the eighth color conversion part is used to convert part of the 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 includes a plurality of second grooves arranged at intervals, and the color conversion structure is located in the plurality of second grooves; the backlight module further includes: a third reflective layer;

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

[0033] Optionally, the backlight module further includes: an encapsulation layer;

[0034] The packaging layer is located on the first side of the substrate and covers the plurality of second grooves and the plurality of second receiving slots.

[0035] Optionally, the first color is blue;

[0036] The color conversion structure includes 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 to convert part of the blue light into red light, the color conversion material of the tenth color conversion part is green, the tenth color conversion part is used to convert part of the blue light into green light;

[0037] or,

[0038] The color conversion structure includes a plurality of eleventh color conversion parts, one of which is disposed in each of the second grooves, the color conversion material of the eleventh color conversion part is yellow, and the eleventh color conversion part is used to convert part of the blue light into yellow light.

[0039] Optionally, the backlight module further includes: a first signal wiring and a second signal wiring, and the light emitting diode includes a first electrode and a second electrode;

[0040] Among them, the first signal line is connected to the first electrode and is used to provide a first signal to the first electrode. The second signal line is connected to the second electrode and is used to provide a second signal to the second electrode. The light-emitting diode is used to emit light under the joint drive of the first signal and the second signal.

[0041] Optionally, the backlight module further includes: 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 0.1 mm to 0.3 mm.

[0044] On the other hand, a display device is provided, comprising: the backlight module as described in the above aspect, and a display module located at a light emitting side of the backlight module;

[0045] Wherein, the backlight module is used to provide backlight for the display module.

[0046] The beneficial effects of the technical solution provided by this application include at least:

[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 a combination of the light of the first color and the light of the second color that have not been converted. That is, the backlight module realizes light emission by combining the light emitting diode and the color conversion structure, so the color gamut of the backlight module can be improved, and then the color gamut of the display device can be improved, and the display effect of the display device can be guaranteed. At the same time, since the color conversion structure is located in the first receiving groove of the substrate, that is, embedded in the interior of the substrate, the overall thickness of the backlight module can be reduced, which is convenient for realizing the thinning of the display device and improving the competitiveness of the display device in the display field. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

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

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

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

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

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

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

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

[0057] Fig. 9 It is a schematic diagram of a light path provided in an embodiment of the present application;

[0058] Fig.10 is a structural schematic diagram of another backlight module provided in an embodiment of the present application;

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

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

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

[0062] Fig.14 is a structural schematic diagram of another backlight module provided in an embodiment of the present application;

[0063] Fig.15 is another optical path schematic diagram provided in an embodiment of the present application;

[0064] Fig.16 is a structural schematic diagram of another backlight module provided in an embodiment of the present application;

[0065] Fig.17 is a structural schematic diagram of another backlight module provided in an embodiment of the present application;

[0066] Fig.18 is a top view of a color conversion structure provided in an embodiment of the present application;

[0067] Fig.19 is a top view of a light-emitting area and a color conversion structure of a light-emitting diode provided in an embodiment of the present application;

[0068] Fig. 20 This is another optical path schematic diagram provided in an embodiment of the present application;

[0069] Fig.21 is a structural schematic diagram of another backlight module provided in an embodiment of the present application;

[0070] Fig. 22 is a structural schematic diagram of another backlight module provided in an embodiment of the present application;

[0071] Fig.23 is a top view of a light emitting area and a color conversion structure of another light emitting diode provided in an embodiment of the present application;

[0072] Fig.24 It is a structural schematic diagram of another backlight module provided in an embodiment of the present application. DETAILED DESCRIPTION

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

[0074] Figure 1 Schematic diagram of the structure of a backlight module provided in an embodiment of the present application. Figure 1 It can be seen that the backlight module 10 includes: 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 receiving groove 101a. The plurality of light-emitting diodes 102 are used to emit light of a first color, the color conversion structure 103 is located in the first receiving groove 101a, and the color conversion structure 103 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. Optionally, the first color can be blue.

[0075] The light of the first color emitted by the LED 102 may directly irradiate the color conversion structure 103 , or the light of the first color emitted by the LED 102 may be irradiated to the color conversion structure 103 after being reflected or refracted by the surrounding structure.

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

[0077] In the embodiment of the present application, the side of the light emitting diodes 102 and the color conversion structure 103 are arranged at intervals in the target direction X, and the target direction X is perpendicular to the supporting surface of the substrate 101. The side of the light emitting diodes 102 and the color conversion structure 103 are arranged at intervals in the target direction X, which means that the light emitted by the light emitting diodes 102 passes through a certain distance in the target direction X before being irradiated on the color conversion structure 103.

[0078] For example, refer to Figure 1 , the side of the light emitting diode 102 and the side of the color conversion structure 103 receiving light are arranged opposite to each other and are spaced apart in the target direction X, so that the light emitted by the light emitting diode 102 is irradiated onto the color conversion structure 103 after passing a certain distance in the target direction X. Alternatively, the side of the light emitting diode 102 and the side of the color conversion structure 103 receiving light face the same side, and a reflective layer is designed on the side of the light emitting diode 102, and the reflective layer and the light emitting diode 102 are spaced apart in the target direction X, so that the light emitted by the light emitting diode 102 is reflected by the reflective layer and irradiated onto the color conversion structure 103.

[0079] In summary, the embodiment of the present application provides a backlight module. Since part of the light of the first color emitted by the light emitting diode in the backlight module can be converted into the light of the second color by the color conversion structure, the light emitted by the backlight module is a combination of the light of the first color and the light of the second color that have not been converted. That is, the backlight module realizes light emission by combining the light emitting diode and the color conversion structure, so the color gamut of the backlight module can be improved, and then the color gamut of the display device can be improved, and the display effect of the display device can be guaranteed. At the same time, since the color conversion structure is located in the first receiving groove of the substrate, that is, embedded in the interior of the substrate, the overall thickness of the backlight module can be reduced, which is convenient for realizing the thinning of the display device and improving the competitiveness of the display device in the display field.

[0080] As a first optional implementation, refer to Figure 1 The plurality of light emitting diodes 102 are located outside the first receiving groove 101a and on the first side of the substrate 101 . Thus, the plurality of light emitting diodes 102 and the color conversion structure 103 are arranged at intervals in the target direction X. The backlight module 10 further includes: a first reflective layer 104 and a second reflective layer 105 .

[0081] The first reflective layer 104 is located in 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, and the opening 105a is used for allowing the light emitted by the light emitting diode 102 to pass through and irradiate the color conversion structure 103 in the first receiving groove 101a.

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

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

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

[0085] In addition to the light converted by the first color conversion unit 1031a and the second color conversion unit 1032a, the blue light also includes the light not converted by the first color conversion unit 1031a or the second color conversion unit 1032a. That is, there are blue light, red light and green light between the first reflection layer 104 and the second reflection layer 105. The three colors of light are combined with each other and are emitted from the second side of the substrate 101 after multiple reflections between the first reflection layer 104 and the second reflection layer 105. In addition, the blue light, the red light and the green light can be combined to form white light.

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

[0087] The blue light includes not only the light converted by the third color conversion unit 1031b, but also the light not converted by the third color conversion unit 1031b. That is, there are blue light and yellow light between the first reflection layer 104 and the second reflection layer 105. 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 reflection layer 104 and the second reflection layer 105. The blue light and the yellow light can combine to form white light.

[0088] In the above schemes 1 and 2, each color conversion part is a patterned structure, and its shape can be circular, rectangular or other shapes. The embodiment of the present application does not limit the shape of each color conversion part. Figure 4 Taking the first solution as an example, the first color conversion portion 1031a and the second color conversion portion 1032a are spaced and evenly arranged in the first receiving groove 101a.

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

[0090] Scheme 3 (color conversion structure 103), reference 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, it is assumed 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, the first part of the blue light can be converted into red light by the first color conversion layer 1031c, the second part of the blue light that is not converted by the first color conversion layer 1031c can be converted into green light by the second color conversion layer 1032c, and the third part of the blue light that is 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 unconverted third part of the blue light are combined 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. Among them, the blue light, the red light and the green light can be combined to form white light.

[0092] Assume 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, and the second part of the blue light that is not converted by the first color conversion layer 1031c, and the third part of the converted green light can be converted into red light by the second color conversion layer 1032c. In addition, the fourth part of the blue light that 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 that is not converted by the second color conversion layer 1032c is still green light. Therefore, the converted red light, the unconverted fifth part of the green light, and the unconverted fourth part of the blue light are combined with each other and are reflected multiple times between the first reflection layer 104 and the second reflection layer 105, and then emitted from the second side of the substrate 101. Among them, the combination of blue light, red light and green light can form white light.

[0093] Scheme 4 (color conversion structure 103), reference Figure 6 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. The third color conversion layer 1031d is used to convert part of the blue light into yellow light.

[0094] In addition to the light converted by the third color conversion layer 1031d, the blue light also includes the light not converted by the third color conversion layer 1031d. That is, there are blue light and yellow light between the first reflection layer 104 and the second reflection layer 105. 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 reflection layer 104 and the second reflection layer 105. In addition, the blue light and the yellow light can be combined to form white light.

[0095] In the above schemes 3 and 4, each color conversion layer is a large film structure. Optionally, 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. In addition, 5% to 15% of scattering particles (such as titanium oxide, etc.) can be mixed into the color conversion material of each color conversion layer to scatter light.

[0096] In the examples of this application, refer 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 receiving groove 101a to fill the first receiving groove 101a. Optionally, the material of the filling layer 106 can be a resin material, such as acrylic resin and epoxy resin.

[0097] In the embodiment of the present application, the material of the first reflective layer 104 may be a metal reflective material, or may be a resin material with a high concentration of scattering particles. The thickness of the first reflective layer 104 ranges from 100 nm (nanometer) to 5 μm. Since the thickness of the resin material is generally about 10 μm, and the thickness of the metal reflective material may be about 100 nm, in order to avoid the first reflective layer 104 being too thick, the material of the first reflective layer 104 may preferably be a metal reflective material, for example, the material of the first reflective layer 104 may 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 the color conversion structure 103, so the design of the opening 105a can correspond to the color conversion structure 103. For example, in the schemes 1 and 2 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 the reference plane covers the orthographic projection of a color conversion portion on the reference plane, and the reference plane is parallel to the supporting surface of the substrate 101. In the schemes 3 and 4 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 the reference plane exposes a part of the color conversion layer.

[0099] Optionally, the material of the second reflective layer 105 is a metal reflective material, or may be a resin material with a 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 generally about 10 μm, and the thickness of the metal reflective material may be about 100 nm, in order to avoid the second reflective layer 105 being too thick, the material of the second reflective layer 105 may preferably be a metal reflective material, for example, the material of the second reflective layer 105 may be a high reflective material such as silver (Ag).

[0100] In the examples of this application, refer to Figures 2 to 3 5 to 6, the backlight module 10 further includes: 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 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. This ensures that the light of the backlight module 10 can be emitted from the second side of the substrate 101. Figure 7 , the orthographic projection of the first grating structure 107 on the reference plane is located at the orthographic projection of the first receiving groove 101a on the reference plane.

[0101] The law of refraction of light satisfies: n1*sinθ1=n2*sin90°. n1 may 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 may range from 1.3 to 1.5. θ1 may be the angle of the light irradiated onto the first grating structure 107. n2 may be the refractive index of the first grating structure 107, for example, the refractive index n2 may range from 1.8 to 2.5. 90° may be used to indicate that the angle of the refracted light is 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, and the grating period is used to indicate the number of grating slits set within a length range of 1 micron. The height range of the first grating structure 107 is 70nm to 100nm, and the duty cycle is 0.5. Among them, the duty cycle of the first grating structure 107 refers to the proportion of the slit area and the non-slit area. The first grating structure 107 is used to transmit blue light and can block the transmission of light of other colors. The first grating structure 107 can be called a blue light grating, and the first grating structure 107 can be a transmission grating.

[0103] In the embodiment 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 450nm to 480nm. In addition, the width range of the light emitting diode 102 can be 20μm to 300 microns, the thickness range can be 5μm to 10μm, and the brightness range can be 1000nit (nit) to 200000nit.

[0104] Optionally, the light emitting diode 102 has a light emitting region 102a and a non-light emitting region 102b. 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 signal lines.

[0105] refer to Figure 8The light emitting diode 102 includes a substrate 1021, and a first doping layer 1022, a light emitting layer 1023, a second doping layer 1024, an insulating layer 1025, a first electrode 1026, and a second electrode 1027 located on the substrate 1021. The first doping layer 1022 has a first target area a1 and a second target area a2, and the light emitting layer 1023 and the second doping layer 1024 are stacked on the first target area a1 and the first doping layer 1022. The insulating layer 1025 is located on a side of the second doping layer 1024 away from the substrate 1021, and the insulating layer 1025 has a first via hole and a second via hole, the first via hole is used to expose a part of the second doping layer 1024, and the second via hole is used to expose a part of the second target area a2. The first electrode 1026 included in the light emitting diode 102 is electrically connected to the second doping 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 region 102 a of the light-emitting diode 102 may be a region between the first electrode 1026 and the second electrode 1027 , and the non-light-emitting region 102 b may include a region where the first electrode 1026 and the second electrode 1027 are located.

[0107] refer to Figures 1 to 3 ,as well as Figure 5 to Figure 6 The backlight module 10 further includes: a first signal line 108 and a second signal line 109. The first signal line 108 is connected to the first electrode 1026, and is used to provide a first signal to the first electrode 1026. The second signal line 109 is connected to the second electrode 1027, and is used to provide a second signal to the second electrode 1027. The light-emitting diode 102 is used to emit light under the common drive 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 signal can be a negative signal.

[0108] Optionally, the first signal trace 108 and the second signal trace 109 may be made of a conductive material, such as copper (Cu). The first signal trace 108 and the second signal trace 109 may have a thickness ranging from 2 μm to 5 μm and a width ranging from 3 μm to 50 μm.

[0109] refer to Figures 2 to 3 as well as Figure 5 to Figure 6 The backlight assembly 10 further includes a protective layer 110 located on the side of the second reflective layer 105 away from the substrate 101. The protective layer 110 mainly plays a role of flatness and protection, and its material can be an epoxy resin material with a transmittance greater than 99% and a thickness ranging from 1 μm to 3 μm.

[0110] Furthermore, the backlight assembly 10 further 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 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 orthographic projection of the lens 111 on the reference plane covers the orthographic projection of the opening 105a in the second reflective layer 105 on the reference plane.

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

[0112] The backlight assembly 10 further includes a white oil layer 112 located on a side of the plurality of light emitting diodes 102 away from the substrate 101 and used to cover the plurality of light emitting diodes 102 to prevent light leakage.

[0113] In the first optional implementation method described above, refer to Fig. 9 , the light emitted by the light emitting diode 102 is converged by the lens 111 and passes through the first grating structure 107. Part of the light of the first color that passes through is converted by the color conversion structure 103. After the light is converted and combined, it is 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. Fig. 9 In order to facilitate the illustration of the light path arrow, Fig. 9 Label each structure in the.

[0114] As a second optional implementation, refer to Fig.10 The color conversion structure 103 includes a fourth color conversion part 1031e and a fifth color conversion part 1032e which are 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.

[0115] And, reference Fig.10 The backlight module 10 further includes a scattering structure 113 located in the first receiving 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 by the scattering structure 113 to the area where the fourth color conversion portion 1031e or the fifth color conversion portion 1032e is located.

[0116] In the embodiment of the present application, the blue light includes not only the light converted by the fourth color conversion unit 1031e and the fifth color conversion unit 1032e, but also the light not converted by the fourth color conversion unit 1031e or the fifth color conversion unit 1032e. That is, there are blue light, red light and green light between the first reflection layer 104 and the second reflection layer 105. The three colors of light are combined with each other and are emitted from the second side of the substrate 101 after multiple reflections between the first reflection layer 104 and the second reflection layer 105. Among them, the blue light, the red light and the green light can be combined to form white light.

[0117] refer to Fig.11 , the orthographic projection of the light emitting region 102a of the light emitting diode 102 on the reference plane covers the orthographic projection of the fourth color conversion portion 1031e, the scattering structure 113 and the fifth color conversion portion 1032e on the reference plane. For example, the shape of the light emitting region 102a of the light emitting diode 102 is circular, the shape of the fourth color conversion portion 1031e and the shape of the fifth color conversion portion 1032e may be similar to a semicircle, and the shape of the scattering structure 113 may be a strip.

[0118] Optionally, the scattering structure 113 can be resin scattering particles (the content of 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 orthographic projection of the first area on the reference plane covers the orthographic projection of the fourth color conversion portion 1031e on the reference plane, and the orthographic projection of the second area on the reference plane covers the orthographic projection of the fifth color conversion portion 1032e on the reference plane. Thus, a portion of the light emitted by the light emitting diode 102 can be irradiated to the fourth color conversion portion 1031e through the first area, and another portion of the light can be irradiated to the fifth color conversion portion 1032e through the second area.

[0120] For further reference, Fig.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. Fig.11 and Fig.12The second grating structure 114 is located in the first region, that is, the orthographic projection of the second grating structure 114 on the reference plane covers the orthographic projection of the fourth color conversion portion 1031e on the reference plane. The third grating structure 115 is located in the second region, that is, the orthographic projection of the third grating structure 115 on the reference plane covers the orthographic projection of the fifth color conversion portion 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 the red light from penetrating into 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 the green light from penetrating into 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 Fig.10 and Fig.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. Fig.13 There is a gap between the second grating structure 114 and the third grating structure 115 , and it is only necessary to ensure that the second grating structure 114 completely covers the fourth color conversion portion 1031 e and the third grating structure 115 completely covers the fifth color conversion portion 1032 e.

[0123] In a second optional implementation, the related designs of the substrate 101, the first receiving 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 wiring 108, the second signal wiring 109, the protective layer 110, the lens 111, and the white oil layer 112 can all refer to the above-mentioned first optional implementation, and the embodiments of the present application will not be repeated here.

[0124] Of course, reference Fig.14 In the second optional implementation, the backlight module 10 may not be designed with the protective layer 110 and the lens 111, and the embodiment of the present application does not limit this.

[0125] In the above second optional implementation, refer to Fig.15, the light emitted by the light emitting diode 102 is irradiated from the second grating structure 114 to the fourth color conversion part 1031e, or is irradiated from the third grating structure 115 to the fifth color conversion part 1032e. And the light irradiated to the scattering structure 113 is transmitted to the fourth color conversion part 1031e or the fifth color conversion part 1032e by the scattering structure 113. After the light is converted by the fourth color conversion part 1031e and the fifth color conversion part 1032e, the converted light is combined with the unconverted light, and then reflected multiple times between the first reflection layer 104 and the second reflection layer 105, and then emitted from the second side of the substrate 101.

[0126] As a third optional implementation, refer to Fig.16 , a plurality of light-emitting diodes 102 are located outside the first receiving groove 101a and on the first side of the substrate 101. The first receiving groove 101a includes a plurality of first grooves C1 arranged at intervals, and the color conversion structure 103 is located in the first groove C1. The first groove C1 may be a groove with a relatively deep depth, so that when the color conversion structure 103 is arranged in the first groove C1, the distance between the surface of the color conversion structure 103 close to the first side of the substrate 101 and the light-emitting diode 102 may be relatively large. In this way, the heat generated when the light-emitting diode 102 emits light can be prevented from affecting the performance of the color conversion structure 103.

[0127] Optionally, the ratio of the distance between the surface of the color conversion structure 103 close to 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] Solution 1 (color conversion structure 103), reference Fig.16 The color conversion structure 103 includes a plurality of sixth color conversion parts 1031f and a plurality of seventh color conversion parts 1032f. Each first groove 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.

[0129] In addition to the light converted by the sixth color conversion unit 1031f and the seventh color conversion unit 1032f, the blue light also includes the light not converted by the sixth color conversion unit 1031f or the seventh color conversion unit 1032f. That is, there are blue light, red light and green light between the first reflection layer 104 and the second reflection layer 105. The three colors of light are combined with each other and emitted from the second side of the substrate 101. The blue light, the red light and the green light can be combined to form white light.

[0130] Solution 2 (color conversion structure 103), reference Fig.17 The color conversion structure 103 includes a plurality of eighth color conversion parts 1031g. Each first groove C1 is provided with one of the plurality of eighth color conversion parts 1031g. The color conversion material of the eighth color conversion part 1031g is yellow, and the eighth color conversion part 1031g is used to convert part of the blue light into yellow light.

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

[0132] In the above schemes 1 and 2, the shape of each color conversion portion can be the same as the shape of the first groove C1. Fig.18 The sixth color conversion part 1031f and the seventh color conversion part 1032f may be circular, rectangular or other shapes. The embodiment of the present application does not limit the shape of each color conversion part and the first groove C1. Optionally, the thickness of each color conversion part ranges from 2 μm to 20 μm. In addition, 5% to 15% of scattering particles (such as titanium oxide, etc.) may be mixed into the color conversion material of each color conversion part to scatter light.

[0133] In the embodiment of the present application, the backlight assembly 10 further includes a lens 111, which is located between the plurality of light-emitting diodes 102 and the color conversion structure 103, specifically located in the first groove C1 and located on the side of the color conversion portion close to the first side of the substrate 101. 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. Furthermore, 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] refer to Fig.18, the sixth color conversion part 1031f and the seventh color conversion part 1032f are evenly distributed, and the first grooves C1 on the corresponding substrate 101 can be evenly distributed. Fig.19 , the orthographic projection of the light emitting area 102a of each light emitting diode 102 on the reference plane can cover the orthographic projection of the color conversion part in the first groove C1 on the reference plane. In addition, the first signal line 108 and the second signal line 109 providing signals to the light emitting diode 102 can also overlap with the color conversion part. In addition, Fig.19 There are connection pads at the locations where the first signal wiring 108 and the second signal wiring 109 are connected to the light emitting diode 102, and the connection pads and the signal wiring can be an integrated structure.

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

[0136] In the third optional implementation method described above, refer to Fig. 20 The light emitted by the light emitting diode 102 is focused by the lens 111 and irradiated onto the color conversion part. After the irradiated light is converted by the color conversion part, the converted light is combined with the unconverted light and then emitted from the second side of the substrate 101. Fig. 20 In order to facilitate the illustration of the light path arrow, Fig. 20 Each structure is annotated in Fig. 20 Only part of the light path is drawn.

[0137] As a fourth optional implementation, refer to Fig.21 , the first side of the substrate 101 also has a plurality of second receiving grooves 101b, and each light-emitting diode 102 is located in a second receiving groove 101b. That is, the light-emitting diode 102 is embedded in the substrate 101. 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 second groove C2. In addition, the backlight module 10 also includes: a third reflective layer 116 located on the second side of the substrate 101, and the third reflective 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 may be a metal reflective material, or may be a resin material with a high concentration of scattering particles. The thickness of the third reflective layer 116 ranges from 100 nm (nanometer) to 5 μm. Since the thickness of the resin material is generally about 10 μm, and the thickness of the metal reflective material may 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 may preferably be a metal reflective material, for example, the material of the third reflective layer 116 may be a high reflective material such as silver (Ag).

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

[0140] Furthermore, a filling material may be designed in the second receiving groove 101b to fill the second receiving groove 101b. Optionally, the filling material may be a resin material, such as acrylic resin and epoxy resin.

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

[0142] Among them, the blue light includes not only the light converted by the ninth color conversion part 1031g and the tenth color conversion part 1032g, but also the light not converted by the ninth color conversion part 1031g and the tenth color conversion part 1032g. That is, the second side of the third reflective layer 116 close to the substrate 101 has blue light, red light and green light. The three colors of light are combined with each other and emitted from the second side of the substrate 101. Among them, the blue light, the red light and the green light can be combined to form white light.

[0143] Solution 2 (color conversion structure 103), reference Fig. 22The color conversion structure 103 includes a plurality of eleventh color conversion parts 1031h. Each second groove C2 is provided with one of the plurality of eleventh color conversion parts 1031h. 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.

[0144] The blue light includes not only the light converted by the eleventh color conversion unit 1031h, but also the light not converted by the eleventh color conversion unit 1031h. That is, the second side of the third reflective layer 116 close to the substrate 101 has blue light and yellow light. The two colors of light combine with each other and are emitted from the second side of the substrate 101. The blue light and the yellow light can combine to form white light.

[0145] In the above schemes 1 and 2, each color conversion portion is a patterned structure, and its shape can be the same as the shape of the second groove C2. Fig.23 The ninth color conversion part 1031g and the tenth color conversion part 1032g are both strip-shaped and staggered. The embodiment of the present application does not limit the shape of each color conversion part. Optionally, the thickness of each color conversion part ranges from 2 μm to 5 μm. In addition, 5% to 15% of scattering particles (such as titanium oxide, etc.) can be mixed into the color conversion material of each color conversion part to scatter light.

[0146] refer to Fig.21 and Fig. 22 It can also be seen that the backlight assembly 10 further includes: an encapsulation layer 117 located on the first side of the substrate 101. The encapsulation layer 117 covers the plurality of second grooves C2 and the plurality of second receiving grooves 101b. That is, the encapsulation layer 117 can protect the color conversion portion in the second groove C2 and the light-emitting diode 102 in the second receiving groove 101b.

[0147] Optionally, the encapsulation layer 117 may be a three-layer structure, wherein the material of the first layer is silicon nitride (SiNx) with a thickness of 1000nm, the material of the second layer is epoxy resin with a thickness of 10μm, and the material of the third layer is aluminum oxide (Al3O2) with a thickness of 100nm. That is, the encapsulation layer 117 may be 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 routing 108, and the second signal routing 109 can all refer to the above-mentioned first optional implementation, and the embodiments of the present application will not be repeated here.

[0149] In the fourth optional implementation method described above, refer to Fig.24 The light emitted by the light emitting diode 102 irradiates the third reflective layer 116 and is reflected to the color conversion unit by the third reflective layer 116. After the light irradiated to the color conversion unit is converted by the color conversion unit, the converted light and the unconverted light are combined and then emitted from the second side of the substrate 101. Fig.24 In order to facilitate the illustration of the light path arrow, Fig.12 The marking of each structure and the filling pattern of the substrate 101 are performed, and Fig.24 Only part of the light path is drawn.

[0150] In summary, the embodiment of the present application provides a backlight module. Since part of the light of the first color emitted by the light emitting diode in the backlight module can be converted into the light of the second color by the color conversion structure, the light emitted by the backlight module is a combination of the light of the first color and the light of the second color that have not been converted. That is, the backlight module realizes light emission by combining the light emitting diode and the color conversion structure, so the color gamut of the backlight module can be improved, and then the color gamut of the display device can be improved, and the display effect of the display device can be guaranteed. At the same time, since the color conversion structure is located in the first receiving groove of the substrate, that is, embedded in the interior of the substrate, the overall thickness of the backlight module can be reduced, which is convenient for realizing the thinning of the display device and improving the competitiveness of the display device in the display field.

[0151] The embodiment of the present application also provides a display device, which includes: the backlight module 10 provided in the above embodiment, and a display module located at 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 may be a liquid crystal display (LCD) display device. The display device may be any appropriate display device, including but not limited to any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, and an e-book.

[0153] Since the display device can have substantially the same technical effects as the backlight module structure tube described in the previous embodiment, the technical effects of the backlight module will not be repeatedly described here for the purpose of brevity.

[0154] The terms used in the embodiments of this application are only used to explain the embodiments of this application, and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of this application should be the common meanings understood by people with general skills in the field to which this application belongs.

[0155] The terms used in the implementation mode 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 implementation mode of the present application should be the common meanings understood by people with ordinary skills in the field to which the present application belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limit, but indicate that there is at least one. Words such as "include" or "include" and similar words mean that the elements or objects appearing in front of "include" or "include" include the elements or objects listed after "include" or "include" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0156] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A backlight module, characterized in that: The backlight module (10) comprises: A substrate (101), wherein a first side of the substrate (101) has a first receiving groove (101a); A plurality of light emitting diodes (102), the plurality of light emitting diodes (102) being configured to emit light of a first color; a color conversion structure (103), the color conversion structure (103) being located in the first containing groove (101a), and the color conversion structure (103) being used to convert part of the light of the first color into light of a second color, the second color being different from the first color; Wherein, the side of the plurality of light emitting diodes (102) emitting light and the color conversion structure (103) are arranged at intervals in the target direction (X), and the target direction (X) is perpendicular to the supporting surface of the substrate (101).

2. The backlight module according to claim 1, characterized in that: The plurality of light-emitting diodes (102) are located outside the first receiving groove (101a) and on a first side of the substrate (101); The backlight module also includes: a first reflective layer (104), the first reflective layer (104) being located in the first containing groove (101a) and between the color conversion structure (103) and the bottom of the first containing groove (101a); A second reflective layer (105), the second reflective layer (105) is located on a first side of the substrate (101) and between the substrate (101) and the plurality of light-emitting diodes (102), the second reflective layer (105) having an opening (105a), the opening (105a) being used for allowing light of a first color emitted by the light-emitting diode (102) to pass through and then irradiate the color conversion structure (103) in the first receiving groove (101a).

3. The backlight module according to claim 2, characterized in that: The first color is blue; The color conversion structure (103) comprises a plurality of first color conversion parts (1031a) and a plurality of second color conversion parts (1032a) which are spaced apart, the color conversion material of the first color conversion part (1031a) being red, and the first color conversion part (1031a) being used to convert a portion of blue light into red light, the color conversion material of the second color conversion part (1032a) being green, and the second color conversion part (1032a) being used to convert a portion of blue light into green light; or, the color conversion structure (103) comprises a first color conversion layer (1031c) and a second color conversion layer (1032c) which are stacked, the first color conversion layer (1031c) being 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) being one of red and green, and the color conversion material of the second color conversion layer (1032c) being the other of red and green; or, The color conversion structure (103) comprises a plurality of third color conversion parts (1031b) arranged at intervals, the color conversion material of the third color conversion parts (1031b) is yellow, and the third color conversion parts (1031b) are used to convert part of the blue light into yellow light; or, the color conversion structure (103) comprises 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 part of the blue light into yellow light.

4. The backlight module according to claim 2, characterized in that: The backlight module (10) further comprises: a first grating structure (107); The first grating structure (107) is located at the opening (105a), and the first grating structure (107) 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 arranged within a length range of 1 micron.

5. The backlight module according to claim 2, characterized in that: The first color is blue; the color conversion structure (103) comprises a fourth color conversion portion (1031e) and a fifth color conversion portion (1032e) which are 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; The backlight module (10) further comprises: a scattering structure (113) located in the first receiving groove (101a) and between the fourth color conversion portion (1031e) and the fifth color conversion portion (1032e), wherein light irradiated to the scattering structure (113) can be transmitted by the scattering structure (113) to the area where the fourth color conversion portion (1031e) or the fifth color conversion portion (1032e) is located.

6. The backlight module according to claim 5, characterized in that: The opening (105a) has a first area and a second area, the orthographic projection of the first area on a reference plane covers the orthographic projection of the fourth color conversion portion (1031e) on the reference plane, and the orthographic projection of the second area on the reference plane covers the orthographic projection of the fifth color conversion portion (1032e) on the reference plane, and the reference plane is parallel to the supporting surface of the substrate (101); The backlight module (10) further comprises: a second grating structure (114) and a third grating structure (115), wherein the second grating structure (114) and the third grating structure (115) both have a plurality of grating slits, the second grating structure (114) is located in the first region, and the grating period of the second grating structure (114) is 430 to 470, the third grating structure (115) is located in the second region, and the grating period of the third grating structure (115) is 400 to 430, and the grating period is used to represent the number of grating slits arranged within a length range of 1 micrometer.

7. The backlight module according to claim 1, characterized in that: The first accommodating groove (101a) comprises a plurality of first grooves (C1) arranged at intervals, the color conversion structure (103) is located in the plurality of first grooves (C1), and the ratio of the distance between the surface of the color conversion structure (103) close to 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) is in a range of 1 / 5 to 3 / 5; Wherein, the plurality of light-emitting diodes are located outside the first containing groove (101a) and are located on the first side of the substrate (101).

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

9. The backlight module according to claim 7, characterized in that: The first color is blue; The color conversion structure (103) comprises 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 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 blue light into green light; or, The color conversion structure (103) has a plurality of eighth color conversion parts (1031g), and each of the first grooves (C1) is provided with one of the plurality of eighth color conversion parts (1031g). The color conversion material of the eighth color conversion part (1031g) is yellow, and the eighth color conversion part (1031g) is used to convert part of the blue light into yellow light.

10. The backlight module according to claim 1, characterized in that: The first side of the substrate (101) further comprises a plurality of second accommodating grooves (101b), and each of the light-emitting diodes (102) is located in one of the second accommodating grooves (101b); the first accommodating groove (101a) comprises 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 comprises: 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).

11. The backlight module according to claim 10, characterized in that: The backlight module further comprises: a packaging layer (117); The packaging 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).

12. The backlight module according to claim 10, characterized in that: The first color is blue; The color conversion structure (103) comprises a plurality of ninth color conversion parts (1031g) and a plurality of tenth color conversion parts (1032g), each of the second grooves (C2) is provided with one of the plurality of ninth color conversion parts (1031g) and the plurality of tenth color conversion parts (1032g), the color conversion material of the ninth color conversion part (1031g) is red, and the ninth color conversion part (1031g) is used to convert part of blue light into red light, the color conversion material of the tenth color conversion part (1032g) is green, and the tenth color conversion part (1032g) is used to convert part of blue light into green light; or, The color conversion structure (103) comprises a plurality of eleventh color conversion parts (1031h), one of the plurality of eleventh color conversion parts (1031h) is arranged 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.

13. The backlight module according to any one of claims 1 to 12, characterized in that: The backlight module further comprises: a first signal wiring (108) and a second signal wiring (109); the light emitting diode (102) comprises a first electrode (1026) and a second electrode (1027); The first signal wiring (108) is connected to the first electrode (1026) to provide a first signal to the first electrode (1026); the second signal wiring (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 common drive of the first signal and the second signal.

14. The backlight module according to any one of claims 1 to 9, 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 12, 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 comprises: the backlight module according to any one of claims 1 to 15, and a display module located at the light emitting side of the backlight module; Wherein, the backlight module is used to provide backlight for the display module.

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