Luminous substrate, backlight module and display device

Abstract

The present disclosure provides a light-emitting substrate, a backlight module and a display device. The light-emitting substrate includes: a base substrate, including a first surface and a second surface opposite to each other, and a plurality of groove groups are arranged on the second surface; the groove groups include a first groove and a second groove located around the first groove; a plurality of light-emitting devices, the light-emitting devices include a first electrode, a second electrode and a light-emitting body arranged therebetween, the light-emitting body emitting a first color light; at least part of the light-emitting devices is arranged in the first groove; a plurality of color conversion units, at least part of the color conversion units is arranged in the second groove; the first electrode and the second electrode are both reflective electrodes, used to reflect the first color light to the color conversion unit; the color conversion unit converts the first color light into a second color light, and the two lights have different colors; the light-emitting device has a third surface away from the first surface, and the color conversion unit has a fourth surface away from the first surface, and the fourth surface is not higher than the third surface.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a light-emitting substrate, a backlight module and a display device. Background Art

[0002] LED backlight refers to the use of LEDs (Light Emitting Diodes) as the backlight source for liquid crystal displays. Compared with traditional CCFL (Cold Cathode Fluorescent Lamp) backlights, LED backlights have the characteristics of low power consumption, low heat generation, high brightness, and long life. LED backlight is generated by three separate LEDs, providing a color spectrum that is closely matched to the color filter of the LCD (Liquid Crystal Display) pixel. Therefore, LED backlights can also improve the color performance of LCD displays. Summary of the Invention

[0003] The present disclosure provides a light-emitting substrate, comprising:

[0004] The substrate comprises a first surface and a second surface opposite to each other, wherein a plurality of groove groups are provided on the second surface; the groove groups include first grooves and second grooves spaced apart from each other;

[0005] a plurality of light-emitting devices, each comprising a first electrode, a second electrode, and a light-emitting body disposed therebetween, the light-emitting body being configured to emit light of a first color; at least a portion of each of the light-emitting devices being disposed in the first groove;

[0006] a plurality of color conversion units, at least a portion of the color conversion units being disposed in the second groove;

[0007] The material of the first electrode and the material of the second electrode both include reflective metal, and the first electrode and the second electrode are used to reflect the light emitted by the light-emitting body to the color conversion unit; the color conversion unit is used to convert the first color light into a second color light, and the first color light and the second color light have different colors;

[0008] The light emitting device has a third surface away from the first surface, and the color conversion unit has a fourth surface away from the first surface, wherein the fourth surface is not higher than the third surface.

[0009] In some embodiments, the first electrode is located on a side of the light-emitting body close to the first surface, and the light-emitting body includes a light-emitting layer;

[0010] The minimum distance between the first electrode and the second electrode in the thickness direction of the substrate is greater than the thickness of the light-emitting layer, and the minimum distance from the surface of the second electrode facing the substrate to the first surface is greater than the distance from the surface of the light-emitting layer facing away from the substrate to the first surface.

[0011] In some embodiments, the closest distance from the surface of the first electrode away from the substrate to the first surface is greater than the minimum distance from the color conversion unit to the first surface, and the minimum distance from the surface of the second electrode close to the substrate to the first surface is less than the maximum distance from the color conversion unit to the first surface.

[0012] In some embodiments, among the plurality of cross sections of the color conversion unit parallel to the first surface, in at least two cross sections, an area of ​​the cross section relatively close to the first surface is smaller than an area of ​​the cross section relatively far from the first surface.

[0013] In some embodiments, the cross-sectional area of ​​the color conversion unit gradually decreases along a direction approaching the first surface.

[0014] In some embodiments, the light-emitting substrate further comprises:

[0015] A reflective layer covers the color conversion unit and is disposed on the same layer as the first electrode.

[0016] In some embodiments, the color conversion unit is entirely located in the second groove; and the light-emitting substrate further comprises:

[0017] A first encapsulation layer, at least a portion of which is located on a side of the color conversion unit away from the base substrate, and is used to encapsulate the color conversion unit.

[0018] In some embodiments, the light-emitting substrate further comprises: a passivation layer, the passivation layer covering the light-emitting body, and a via hole being provided on the passivation layer;

[0019] The second electrode is arranged on a side of the passivation layer away from the base substrate, and the second electrode is electrically connected to the light-emitting body through the via hole.

[0020] In some embodiments, the light-emitting substrate further comprises:

[0021] A connecting layer is connected to the second electrodes of the plurality of light-emitting devices to form a whole layer structure; the connecting layer is located on a side of the color conversion unit away from the first surface.

[0022] In some embodiments, in the same groove set, the second groove surrounds the first groove.

[0023] In some embodiments, a distance between the first groove and the second groove is less than or equal to 2 μm.

[0024] In some embodiments, the material of the color conversion unit includes quantum dot material.

[0025] The present disclosure also provides a backlight module, comprising the light-emitting substrate described in the above embodiments.

[0026] The present disclosure also provides a display device, comprising the backlight module described in the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0028] Figure 1 This is a schematic structural diagram of a light-emitting substrate provided in an embodiment of the present disclosure.

[0029] Figure 2 A schematic diagram of a light-emitting substrate provided in an embodiment of the present disclosure.

[0030] Figure 3 A schematic diagram of the partial structure of a light-emitting device provided in an embodiment of the present disclosure.

[0031] Figure 4 This is a top view of the positional relationship between a first groove and a second groove provided in an embodiment of the present disclosure.

[0032] Figure 5 This is a flow chart of a method for manufacturing a light-emitting substrate provided in an embodiment of the present disclosure.

[0033] Figures 6A to 6F This is a flowchart of a manufacturing process of a light-emitting substrate provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0034] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0035] In this specification, for convenience, words and phrases indicating orientation or positional relationships, such as "middle," "upper," "lower," "front," "back," "vertical," "horizontal," "top," "bottom," "inside," and "outside," are used to illustrate the positional relationships of constituent elements with reference to the accompanying drawings. This is only for the purpose of facilitating the description of this specification and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as a limitation of the present disclosure. The positional relationships of the constituent elements may be appropriately changed according to the direction in which each constituent element is described. Therefore, the words and phrases described in the specification are not limited and may be appropriately replaced according to the circumstances.

[0036] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should have the usual meanings understood by people with ordinary skills in the field to which the present disclosure belongs. The words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The terms "install", "connect" and "connect" should be understood in a broad sense. For example, it can be fixedly connected, or detachably connected, or connected in one piece; it can be mechanically connected or connected; it can be directly connected, or indirectly connected through an intermediate piece, or the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0037] Figure 1 This is a schematic structural diagram of a light-emitting substrate provided in an embodiment of the present disclosure. Figure 2 A schematic diagram of a light-emitting substrate provided in an embodiment of the present disclosure is shown in FIG. Figure 1 and Figure 2 As shown, the light-emitting substrate includes a base substrate 1, a plurality of light-emitting devices 3, and a plurality of color conversion units 2. The base substrate 1 can be made of glass. The base substrate 1 includes a first surface 101 and a second surface 102 facing each other. A plurality of groove groups are provided on the second surface 102. The groove groups include first grooves 11 and second grooves 10 spaced apart.

[0038] At least a portion of the light-emitting device 3 is disposed in the first groove 11 , and the light-emitting device 3 includes a first electrode 301 , a second electrode 303 , and a light-emitting body 302 disposed therebetween, configured to emit light of a first color. At least a portion of the color conversion unit 2 is disposed in the second groove 10 .

[0039] In the disclosed embodiment, the first electrode 301 and the second electrode 303 are respectively configured to receive different voltage signals. The material of the first electrode 301 and the second electrode 303 includes a reflective metal. Preferably, the reflective metal can be a metal such as Ag, Ni, Al, Cr, Rh, Pd, Ir, Ru, Mg, Zn, Pt, or Au, and can be used as a structure having a single layer or two or more layers. The first electrode 301 and the second electrode 303 are configured to reflect light emitted by the light-emitting body 302 to the color conversion unit 2. The color conversion unit 2 is configured to convert the first color light into the second color light, and the first color light and the second color light are different colors.

[0040] In some embodiments, the material of the color conversion unit 2 may include quantum dot material. For example, all light-emitting devices 3 are blue light-emitting devices, and each color conversion unit 2 includes red quantum dot material, green quantum dot material, and a scattering material. The red quantum dot material and the green quantum dot material, respectively, emit red and green light when excited by blue light. The scattering material scatters the blue light emitted by the blue light-emitting device 3, and the red, green, and blue light emitted by the color conversion unit 2 mix to produce white light. For another example, the light-emitting substrate includes multiple light-emitting groups, each of which includes multiple color conversion units 2 and scattering units. Within a light-emitting group, each color conversion unit 2 emits light of a single color, such as red or green. The multiple color conversion units 2 within a light-emitting group include a red color conversion unit and a green color conversion unit. The red color conversion unit includes a red quantum dot material, the green color conversion unit includes a green color conversion material, and the scattering unit includes a scattering material. The red, green, and blue light emitted by the multiple color conversion units 2 and scattering units within the same light-emitting group mix to produce white light.

[0041] Among them, the above-mentioned quantum dot materials can be one or more of ZnCdSe2, CdSe, CdTe, InP, InAs; quantum dots can be not limited to the above-mentioned materials, and can be selected from II-VI compounds, III-V compounds, IV-VI compounds, IV elements, IV compounds and / or their combinations.

[0042] In other embodiments, the material of the color conversion unit 2 may include a fluorescent material and a phosphorescent material, for example, a red phosphorescent material and a green fluorescent material, the red phosphorescent material may be at least one of (Ca, Sr, Ba) S, (Ca, Sr, Ba) 2 Si 5 N 8, CASN (CaAlSiN 3), CaMoO 4 and Eu 2 Si 5 N 8; the green fluorescent material may be yttrium aluminum garnet (YAG), (Ca, Sr, Ba) 2 SiO 4, SrGa 2 S 4, BAM, α-SiAlON, β-SiAlON, Ca 3 Sc 2 Si 3 O 12 、Tb3Al5O12 , BaSiO4, CaAlSiON and (Sr 1-x Ba x )At least one material among Si2O2N2, where x can be a number between 0 and 1.

[0043] like Figure 1 As shown, the light-emitting device 3 has a third surface 304 away from the first surface 101. At least a portion of the color conversion unit 2 is disposed in the second groove 10. The color conversion unit 2 also has a fourth surface 204 away from the first surface 101. The fourth surface 204 is not higher than the third surface 304. This arrangement prevents the color conversion unit 2 from being squeezed and damaged.

[0044] In the disclosed embodiment, a first groove 11 and a second groove 10 are provided on the base substrate 1, and a light-emitting device 3 and a color conversion unit 2 are disposed in the first and second grooves 11 and 10. This allows the first color light emitted by the light-emitting device 3 to be fully directed to the color conversion unit 2 in the lateral second groove 10, thereby enabling the color conversion unit 2 to convert the first color light into the second color light. This arrangement not only maximizes the utilization of the first color light emitted by the light-emitting device 3 but also prevents the color conversion unit 2 from being squeezed and damaged. Furthermore, placing the color conversion unit 2 in the second groove 10 reduces the thickness of the light-emitting substrate, thereby making the entire backlight module thinner and lighter.

[0045] In some embodiments, as Figure 2 As shown, the first electrode 301 is located on a side of the light-emitting body 302 close to the first surface 101. The light-emitting substrate further includes a passivation layer 6, wherein the passivation layer 6 covers the light-emitting body 302 and is provided with a via 9. The material of the passivation layer 6 may include a silicon compound, such as silicon oxide, silicon nitride, or silicon oxynitride. The second electrode 303 is located on a side of the passivation layer 6 away from the base substrate 1 and is electrically connected to the light-emitting body 302 through the via 9.

[0046] In some embodiments, as Figure 2 As shown, the light-emitting body 302 includes a light-emitting layer 302a. The minimum distance D3 between the first electrode 301 and the second electrode 303 in the thickness direction of the base substrate 1 is greater than the thickness D4 of the light-emitting layer 302a. The minimum distance D5 between the surface of the second electrode 303 facing the base substrate 1 and the first surface 101 is greater than the distance D6 between the surface of the light-emitting layer 302a facing away from the base substrate 1 and the first surface 101. This arrangement allows some light emitted by the light-emitting layer 302a to be directed directly to the color conversion unit 2 without being reflected by the electrodes, thereby improving light efficiency.

[0047] like Figure 2As shown, the first electrode 301 includes a first main portion 301b and a first edge portion 301a. The orthographic projection of the first main portion 301b on the first surface 101 is overlapped by the orthographic projection of the light-emitting body 302 on the first surface 101, and the first edge portion 301a surrounds the first main portion 301b. The second electrode 303 includes a second main portion 303a and a second edge portion 303b. The orthographic projection of the second main portion 303a on the first surface 101 is overlapped by the orthographic projection of the light-emitting body 302 on the first surface 101, and the second edge portion 303b surrounds the second main portion 303a. The minimum distance D3 between the first electrode 301 and the second electrode 303 in the thickness direction of the substrate 1 is the minimum distance between the second edge portion 303b and the first edge portion 301a in the thickness direction of the substrate 1. The minimum distance D5 between the surface of the second electrode 303 facing the substrate 1 and the first surface 101 is the minimum distance between the surface of the second edge portion 303b facing the substrate 1 and the first surface 101.

[0048] For example, in one embodiment, during operation of the light-emitting device 3, light emitted by the light-emitting layer 302a will diffuse in all directions. This diffused light can be reflected by the first electrode 301 and the second electrode 302 and ultimately emitted through the gap between the first edge portion 301a and the second edge portion 303b to the color conversion unit 2. The distance between the surface of the light-emitting layer 302a away from the first electrode 301 and the first electrode 301 is 5 μm, and D3 is greater than 5 μm. Therefore, some light emitted by the light-emitting layer 302a does not need to be reflected, but can instead directly pass through the gap between the first edge portion 301a and the second edge portion 303b to the color conversion unit 2, thereby improving light efficiency.

[0049] Figure 3 A schematic diagram of a partial structure of a light emitting device provided in an embodiment of the present disclosure is shown in FIG. Figure 2 and Figure 3 As shown, the light emitting body 302 includes a first semiconductor layer 302b, a second semiconductor layer 302c, and a light emitting layer 302a located between the first semiconductor layer 302b and the second semiconductor layer 302c, wherein the first semiconductor layer 302b is electrically connected to the first electrode 301, and the second semiconductor layer 302c is electrically connected to the second electrode 303. One of the first semiconductor layer 302b and the second semiconductor layer 302c is an N-type semiconductor layer, which may be an N-type semiconductor layer. x Al y Ga 1-x-yAn n-type nitride semiconductor layer with an N(0≤x<1, 0≤y<1, 0≤x + y<1) composition, where the n-type impurity can be silicon. For example, the first semiconductor layer 302b can include n-type GaN. The other of the first semiconductor layer 302b and the second semiconductor layer 302c is a p-type semiconductor layer, and the p-type semiconductor layer can be a layer containing In x Al y Ga 1-x-y A p-type nitride semiconductor layer with an N(0≤x<1, 0≤y<1, 0≤x + y<1) composition, where the p-type impurity can be magnesium. For example, the second semiconductor layer 302c can be a single-layer structure, but in some exemplary embodiments, it can have a multi-layer structure containing different compositions.

[0050] In some embodiments, the light-emitting layer 302a can have a multi-quantum well (MQW) structure (not shown), where the quantum well layers and the quantum barrier layers are stacked alternately with each other. For example, the quantum well layers and the quantum barrier layers can respectively include In[[ID=A]] x [[ID=B]]Al[[ID=C]] y [[ID=D]]Ga[[ID=E]] 1-x- [[ID=F]] y N(0≤x≤1, 0≤y≤1, 0≤x + y≤1) with different compositions. In one example, the quantum well layer can include In x Ga 1-x N(0<x≤1) composition, and the quantum barrier layer can include GaN or AlGaN. The light-emitting layer 302a is not limited to the MQW structure and can have a single quantum well (SQW) structure.

[0051] In some embodiments, as Figure 2 shown, the minimum distance D9 from the surface of the first electrode 301 away from the substrate 1 to the first surface 101 is greater than the minimum distance D7 from the color conversion unit 2 to the first surface 101, and the minimum distance D5 from the surface of the second electrode 303 close to the substrate 1 to the first surface 101 is less than the maximum distance D8 from the color conversion unit 2 to the first surface 101. This setting can make as much of the first color light emitted by the light-emitting layer 302a as possible be emitted onto the color conversion unit 2, thereby improving the conversion efficiency of the first color light.

[0052] In some embodiments, among at least two cross-sections in the plurality of cross-sections of the color conversion unit 2 parallel to the first surface, the area of the cross-section relatively closer to the first surface 101 is smaller than the area of the cross-section farther from the first surface orte101.

[0053] Furthermore, along the direction closer to the first surface 101, the area of the cross-section of the color conversion unit 2 gradually decreases. For example, the longitudinal cross-section of the color conversion unit 2 can be an inverted trapezoidal structure. Here, the longitudinal cross-section of the color conversion unit 2 refers to the cross-section of the color conversion unit 2 in the direction parallel to the thickness of the substrate 1.

[0054] Of course, the longitudinal cross-section of the color conversion unit 2 may also have other structures that meet this definition.

[0055] In some embodiments, the light-emitting substrate further includes a reflective layer 8. The reflective layer 8 covers the color conversion unit 2 and is disposed in the same layer as the first electrode 301. It should be noted that, in this disclosure, "two structures disposed in the same layer" means that they are formed in the same film or produced by the same patterning process, are in direct contact with the same film layer, or are at the same distance from a reference plane.

[0056] The reflective layer 8 is used to reflect the second color light emitted by the color conversion unit 2 toward the first surface, and then emit the second color light from the first surface, thereby improving light utilization efficiency.

[0057] In some embodiments, the color conversion unit 2 is entirely located within the second groove 10, and the light-emitting substrate further includes a first encapsulation layer 5. At least a portion of this first encapsulation layer 5 is located on a side of the color conversion unit 2 away from the base substrate 1, thereby encapsulating the color conversion unit 2. The first encapsulation layer 5 can be made of a material such as silicone or white oil, and serves to protect the color conversion unit 2. The height of the color conversion unit 2 can be the same as the depth of the second groove 10, meaning that the color conversion unit 2 fills the second groove 10. Of course, the height of the color conversion unit 2 can be less than the depth of the second groove 10. For example, the sum of the height of the color conversion unit 2 and the thickness of the first encapsulation layer 5 can equal the depth of the second groove 10.

[0058] Among them, the first encapsulation layer 5 can only cover the color conversion unit 2 in the second groove 10, or a portion of it can be set on the color conversion unit 2 in the second groove 10 to cover the color conversion unit 2, and the other portion can be set on the inner surface of the first groove 11, thereby forming a whole layer structure. When the first encapsulation layer 5 is a whole layer structure, there is no need to compose the first encapsulation layer 5, thereby simplifying the manufacturing process.

[0059] In addition to the above-mentioned first encapsulation layer 5, the light-emitting substrate may also include a second encapsulation layer 4 and a protective layer (not shown). The second encapsulation layer 4 is arranged on the side of the second electrode 303 away from the base substrate 1, and the second encapsulation layer 4 may include a first inorganic encapsulation layer, a second inorganic encapsulation layer, and an organic encapsulation layer located therebetween. The second encapsulation layer 4 is used to encapsulate the light-emitting device 3 to prevent water vapor and / or oxygen in the external environment from corroding the light-emitting device 3, thereby improving the reliability of the light-emitting device 3. The protective layer is arranged on the side of the second encapsulation layer 4 away from the base substrate 1, and the protective layer can be a glass cover plate or a cover plate made of other materials, which is used to protect other structures in the light-emitting substrate.

[0060] In some embodiments, the light-emitting substrate further includes a connecting layer 7, which is connected to the second electrodes 303 of the plurality of light-emitting devices 3 to form a single layer. The connecting layer 7 is located on the side of the color conversion unit 2 away from the first surface 101. In actual applications, some first color light may pass through the color conversion unit 2 without being reflected by the reflective layer 8. The provision of the connecting layer 7 can reflect the light not reflected by the reflective layer 8 toward the first surface 101, thereby improving light utilization.

[0061] Figure 4 Schematic diagram of the positional relationship between a first groove and a second groove provided in an embodiment of the present disclosure, such as Figure 4 As shown, in some embodiments, in the same groove group, the second groove 10 surrounds the first groove 11. This arrangement enables the color conversion unit 2 to form a ring structure, so that the first color light emitted by the light-emitting device 3 in the first groove 11 can be directed toward the color conversion unit 2 to the maximum extent, thereby improving the light utilization efficiency of the light-emitting device 3.

[0062] In one example, if Figure 4 As shown, the orthographic projection of the first groove 11 on the first surface 101 can be a rectangle, and the orthographic projection of the second groove 10 on the first surface 101 can be an annular shape, and the inner and outer edge shapes of the annular shape are the same as the orthographic projection of the first groove 11. In another example, the orthographic projection of the first groove 11 on the first surface 101 can be a circle, and the orthographic projection of the second groove 10 on the first surface 101 can be an annular shape, and the inner and outer edge shapes of the annular shape are the same as the orthographic projection of the first groove 11. Of course, in other examples, the orthographic projections of the first groove 11 and the second groove 10 on the first surface 101 can also be other shapes, and the inner and outer edge shapes of the orthographic projection of the second groove 10 on the first surface 101 can be the same as or different from the orthographic projection of the first groove 11. For example, the orthographic projection of the first groove 11 on the first surface 101 can be a circle, and the orthographic projection of the second groove 10 on the first surface 101 can be an annular shape. In this case, the inner and outer edge shapes of the orthographic projection of the second groove 10 on the first surface 101 are different from the orthographic projection of the first groove 11.

[0063] In some examples, the second groove 10 may be a continuous annular structure (a circular ring or a rectangular ring, etc.). In other examples, the second groove 10 may also include multiple segments spaced apart from each other, and the multiple segments are arranged around the first groove 11.

[0064] In some examples, such as Figure 4As shown, each groove set includes a first groove 11 and a second groove 10, with the second groove 10 surrounding the first groove 11. In other examples, the number of first grooves 11 and second grooves 10 in a groove set may also be other. For example, a groove set includes a second groove 10 and multiple first grooves 11, with one second groove 10 surrounding multiple first grooves 11.

[0065] In some embodiments, as Figure 1 and Figure 2 As shown, the distance L between the first groove 11 and the second groove 10 is less than or equal to 2 μm. For example, the distance L between the first groove 11 and the second groove 10 can be 0.5 μm, 1 μm, 1.5 μm, or 2 μm. The distance L between the first groove 11 and the second groove 10 is less than or equal to 2 μm, which can make the color conversion unit 2 more efficient in converting the first color light into the second color light.

[0066] It should be noted that the distance L between the first groove 11 and the second groove 10 refers to the distance between the orthographic projections of the first groove 11 and the second groove 10 on the first surface 101 .

[0067] The width D1 and depth H1 of the first groove 11 can be reasonably set according to the size of the light-emitting device 3. For example, the depth H1 of the first groove 11 can be less than the thickness of the light-emitting device 3, and the width of the first groove 11 is greater than or equal to 10 μm. For example, the depth H2 of the second groove 10 is greater than or equal to 20 μm, and the width D2 of the second groove 10 is greater than or equal to 50 μm.

[0068] In some embodiments, the plurality of groove groups may be arranged in an array. In one example, the spacing between two adjacent groove groups in the same row may be the same as or approximately the same as the spacing between two adjacent groove groups in the same column. The spacing between two adjacent groove groups refers to the closest distance between the two adjacent groove groups.

[0069] It should be noted that the groove groups may also be arranged according to other rules.

[0070] Figure 5 This is a flow chart of a method for manufacturing a light-emitting substrate provided in an embodiment of the present disclosure, such as Figure 5 As shown, the method for manufacturing the light-emitting substrate includes the following steps:

[0071] S1. Form a plurality of groove groups on the second surface of the base substrate 1. The groove groups include a first groove 11 and a second groove 10 located around the first groove 11. The base substrate 1 also includes a first surface 101 opposite to the second surface 102.

[0072] S2 . Form a plurality of color conversion units 2 , at least part of which is disposed in the second groove 10 .

[0073] S3. Form a plurality of light-emitting devices 3. The light-emitting devices 3 include a first electrode 301, a second electrode 303, and a light-emitting body 302 disposed therebetween. The light-emitting body 302 is configured to emit light of a first color. At least a portion of the light-emitting devices 3 is disposed in the first groove 11.

[0074] The first electrode 301 and the second electrode 303 are both made of reflective metal and are used to reflect light emitted by the light-emitting body 302 toward the color conversion unit 2. The color conversion unit 2 is used to convert the first color light into the second color light. The first color light-emitting device 3 has a third surface 304 away from the first surface 101. The color conversion unit 2 has a fourth surface 204 away from the first surface 101, and the fourth surface 204 is no higher than the third surface 304. The first color light and the second color light have different colors.

[0075] Figures 6A to 6F This is a structural diagram of a light-emitting substrate during the manufacturing process provided in an embodiment of the present disclosure, such as Figures 6A to 6F As shown, the production method includes:

[0076] S101、 Figure 6A As shown, a plurality of first grooves 11 and a plurality of second grooves 10 are etched on the base substrate 1 by laser etching or ICP or other methods.

[0077] S102, such as Figure 6B As shown, the color conversion unit 2 is filled in the second groove 10, and then the first encapsulation layer 5 and a plurality of first electrodes 301 are formed in sequence. One first electrode 301 is provided in each first groove 11.

[0078] S103, such as Figure 6C As shown, the light emitting body 302 is disposed on the first electrode 301 through a die bonding process.

[0079] S104, such as Figure 6D As shown, a passivation layer 6 is formed.

[0080] S105, such as Figure 6E As shown, a via hole 9 is formed on the passivation layer 6 , and a second electrode 303 of the light emitting device 3 is formed, and the second electrode 303 is electrically connected to the light emitting body 302 through the via hole 9 .

[0081] S106, such as Figure 6F As shown, a second encapsulation layer 4 is formed.

[0082] The present disclosure also provides a backlight module, comprising the light-emitting substrate in the above embodiment.

[0083] The present disclosure also provides a display device comprising the backlight module described in the above embodiments. The display device can be any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigation system. A display device employing the above backlight module can improve light extraction efficiency and enhance the display quality of the display device.

[0084] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A light-emitting substrate, characterized in that: The light-emitting substrate comprises: The substrate comprises a first surface and a second surface opposite to each other, wherein a plurality of groove groups are provided on the second surface; the groove groups include first grooves and second grooves spaced apart from each other; a plurality of light-emitting devices, each comprising a first electrode, a second electrode, and a light-emitting body disposed therebetween, the light-emitting body being configured to emit light of a first color; at least a portion of each of the light-emitting devices being disposed in the first groove; a plurality of color conversion units, at least a portion of the color conversion units being disposed in the second groove; The material of the first electrode and the material of the second electrode both include reflective metal, and the first electrode and the second electrode are used to reflect the light emitted by the light-emitting body to the color conversion unit; the color conversion unit is used to convert the first color light into the second color light, and the first color light and the second color light have different colors; The light emitting device has a third surface away from the first surface, and the color conversion unit has a fourth surface away from the first surface, wherein the fourth surface is not higher than the third surface.

2. The light-emitting substrate according to claim 1, wherein The first electrode is located on a side of the light-emitting body close to the first surface, and the light-emitting body includes a light-emitting layer; The minimum distance between the first electrode and the second electrode in the thickness direction of the substrate is greater than the thickness of the light-emitting layer, and the minimum distance from the surface of the second electrode facing the substrate to the first surface is greater than the distance from the surface of the light-emitting layer facing away from the substrate to the first surface.

3. The light-emitting substrate according to claim 2, wherein: The minimum distance between the surface of the first electrode away from the substrate and the first surface is greater than the minimum distance between the color conversion unit and the first surface, and the minimum distance between the surface of the second electrode close to the substrate and the first surface is less than the maximum distance between the color conversion unit and the first surface.

4. The light-emitting substrate according to any one of claims 1 to 3, characterized in that Among the plurality of cross sections of the color conversion unit parallel to the first surface, there are at least two cross sections, the areas of the cross sections relatively close to the first surface being smaller than the areas of the cross sections relatively far from the first surface.

5. The light-emitting substrate according to claim 4, characterized in that The cross-sectional area of ​​the color conversion unit gradually decreases in a direction approaching the first surface.

6. The light-emitting substrate according to any one of claims 1 to 3, characterized in that The light-emitting substrate further includes: A reflective layer covers the color conversion unit and is provided on the same layer as the first electrode.

7. The light-emitting substrate according to any one of claims 1 to 3, characterized in that The color conversion unit is entirely located in the second groove; the light-emitting substrate further includes: A first encapsulation layer, at least a portion of which is located on a side of the color conversion unit away from the base substrate, and is used to encapsulate the color conversion unit.

8. The light-emitting substrate according to any one of claims 1 to 3, characterized in that The light-emitting substrate further includes: a passivation layer, the passivation layer covers the light-emitting body, and a via hole is provided on the passivation layer; The second electrode is arranged on a side of the passivation layer away from the base substrate, and the second electrode is electrically connected to the light-emitting body through the via hole.

9. The light-emitting substrate according to any one of claims 1 to 3, characterized in that The light-emitting substrate further includes: A connecting layer is connected to the second electrodes of the plurality of light-emitting devices to form a whole layer structure; the connecting layer is located on a side of the color conversion unit away from the first surface.

10. The light emitting substrate according to any one of claims 1 to 3, characterized in that In the same groove group, the second groove surrounds the first groove.

11. The light-emitting substrate according to claim 10, wherein: A distance between the first groove and the second groove is less than or equal to 2 μm.

12. The light-emitting substrate according to any one of claims 1 to 3, characterized in that: The material of the color conversion unit includes quantum dot material.

13. A backlight module, characterized in that: The light-emitting substrate comprises the light-emitting substrate according to any one of claims 1 to 12.

14. A display device, characterized in that: Including the backlight module described in claim 13.

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