Light-emitting substrate, backlight module and display device

Abstract

The invention provides a light-emitting substrate, a backlight module and a display device, and the light-emitting substrate comprises a substrate which comprises a first surface and a second surface which are opposite to each other, and the second surface is provided with a plurality of groove groups; the groove group comprises a first groove and a second groove positioned at the periphery of the first groove; each light-emitting device comprises a first electrode, a second electrode and a light-emitting main body arranged between the first electrode and the second electrode, and the light-emitting main bodies emit first color light; at least part of the light-emitting device is arranged in the first groove; at least part of the color conversion units are arranged in the second grooves; the first electrode and the second electrode are reflecting electrodes and are used for reflecting the first color light to the color conversion unit; the color conversion unit converts the first color light into second color light, and the two kinds of light are different in color; the light-emitting device has a third surface away from the first surface, 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 LED (Light Emitting Diode) as the backlight source of the liquid crystal display. Compared with the traditional CCFL (Cold Cathode Fluorescent Lamp) backlight source, LED backlight source has the characteristics of low power consumption, low heat generation, high brightness, and long life. In addition, LED backlight is generated by three separate LEDs, providing a color spectrum that is quite consistent with the LCD (Liquid Crystal Display) pixel filter itself. Therefore, LED backlight can also enhance the color performance of LCD display. Summary of the invention

[0003] The present disclosure provides a light-emitting substrate, the 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 arranged on the second surface; the groove groups comprise first grooves and second grooves arranged at intervals;

[0005] A plurality of light-emitting devices, each of which comprises a first electrode, a second electrode and a light-emitting body disposed therebetween, wherein the light-emitting body is used to emit light of a first color; at least a portion of the light-emitting device is 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] Wherein, the material of the first electrode and the material of the second electrode both include reflective metal, 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;

[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 far 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 the reflective layer 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 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 covers the light-emitting body, and a via is 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 embodiment. 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 specific embodiments, 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 It is a schematic structural diagram of a light-emitting substrate provided in an embodiment of the present disclosure.

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

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

[0031] Figure 4 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 The present invention is a flow chart of a method for manufacturing a light-emitting substrate provided in an embodiment of the present disclosure.

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

[0034] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0035] In this specification, for the sake of convenience, the words and phrases indicating the orientation or positional relationship such as "middle", "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like are used to illustrate the positional relationship of the constituent elements with reference to the 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, and therefore cannot be understood as a limitation of the present disclosure. The positional relationship of the constituent elements is appropriately changed according to the direction in which each constituent element is described. Therefore, it is not limited to the words and phrases described in the specification and can be appropriately replaced according to the situation.

[0036] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be 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, 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 is a schematic structural diagram of a light-emitting substrate provided in an embodiment of the present disclosure, Figure 2 Schematic diagram of a light-emitting substrate provided in an embodiment of the present disclosure, such as 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, wherein the base substrate 1 may be made of glass. The base substrate 1 includes a first surface 101 and a second surface 102 opposite to each other, and a plurality of groove groups are arranged on the second surface 102, and the groove groups include first grooves 11 and second grooves 10 arranged at intervals.

[0038] At least part 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, and the light emitting body 302 is used to emit light of a first color. At least part of the color conversion unit 2 is disposed in the second groove 10 .

[0039] In the embodiment of the present disclosure, the first electrode 301 and the second electrode 303 are respectively used to receive different voltage signals, and the materials of the first electrode 301 and the second electrode 303 include 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 with a single layer or two or more layers. The first electrode 301 and the second electrode 303 are used to reflect the light emitted by the light-emitting body 302 to the color conversion unit 2, and the color conversion unit 2 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.

[0040] In some embodiments, the material of the color conversion unit 2 may include quantum dot material. For example, the light-emitting devices 3 are all blue light-emitting devices, and each color conversion unit 2 includes red quantum dot material, green quantum dot material and scattering material. Wherein, the red quantum dot material and the green quantum dot material emit red light and green light respectively under the excitation of blue light, and the scattering material scatters the blue light emitted by the blue light-emitting device 3, and the red light, green light, and blue light emitted by the color conversion unit 2 are mixed to obtain white light. For another example, the light-emitting substrate includes a plurality of light-emitting groups, each of which includes a plurality of color conversion units 2 and a scattering unit. In the same light-emitting group, each color conversion unit 2 emits a single color of light, such as red or green; wherein, the plurality of color conversion units 2 in the same 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 light, green light and blue light emitted by the plurality of color conversion units 2 and the scattering unit in the same light-emitting group are mixed to obtain 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 group compounds, III-V group compounds, IV-VI group compounds, IV group elements, IV group 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)2Si5N8, CASN (CaAlSiN3), CaMoO4 and Eu2Si5N8; the green fluorescent material may be yttrium aluminum garnet (YAG), (Ca, Sr, Ba)2SiO4, SrGa2S4, BAM, α-SiAlON, β-SiAlON, Ca3Sc2Si3O 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 part of the color conversion unit 2 is disposed in the second groove 10, and the color conversion unit 2 has a fourth surface 204 away from the first surface 101. The fourth surface 204 is not higher than the third surface 304, and this arrangement can prevent the color conversion unit 2 from being squeezed and damaged.

[0044] In the disclosed embodiment, by setting the first groove 11 and the second groove 10 on the base substrate 1, and setting the light-emitting device 3 and the color conversion unit 2 in the first groove 11 and the second groove 10, the first color light emitted by the light-emitting device 3 is completely introduced into the color conversion unit 2 in the lateral second groove 10, so that the color conversion unit 2 converts the first color light into the second color light. This arrangement can not only maximize the use of the first color light emitted by the light-emitting device 3, but also avoid the problem of the color conversion unit 2 being squeezed and damaged. In addition, by setting the color conversion unit 2 in the second groove 10, the thickness of the light-emitting substrate can be reduced, thereby making the entire backlight module thinner and lighter.

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

[0046] In some embodiments, 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, and the minimum distance D5 from the surface of the second electrode 303 facing the base substrate 1 to the first surface 101 is greater than the distance D6 from the surface of the light-emitting layer 302a facing away from the base substrate 1 to the first surface 101. This arrangement allows part of the light emitted by the light-emitting layer 302a to be directly emitted to the color conversion unit 2 without being reflected by the electrode, thereby improving the light efficiency.

[0047] like Figure 2As shown, the first electrode 301 includes: a first main body portion 301b and a first edge portion 301a, the orthographic projection of the first main body portion 301b on the first surface 101 is covered 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 body portion 301b. The second electrode 303 includes a second main body portion 303a and a second edge portion 303b, the orthographic projection of the second main body portion 303a on the first surface 101 is covered 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 body portion 303a. The minimum distance D3 between the first electrode 301 and the second electrode 303 in the thickness direction of the substrate 1 refers to 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 from the surface of the second electrode 303 facing the substrate 1 to the first surface 101 refers to the minimum distance from the surface of the second edge portion 303b facing the substrate 1 to the first surface 101.

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

[0049] Figure 3 is a partial structural diagram of a light emitting device provided in an embodiment of the present disclosure, such as 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, and the N-type semiconductor layer can be an N-type semiconductor layer. x Al y Ga 1-x-yAn n-type nitride semiconductor layer of the composition N(0 ≤ x < 1, 0 ≤ y < 1, 0 ≤ x + y < 1), and the n-type impurity can be silicon. For example, the first semiconductor layer 302b can include n-type GaN. The other one 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 an IN-containing x Al y Ga 1-x-y A p-type nitride semiconductor layer of the composition N(0 ≤ x < 1, 0 ≤ y < 1, 0 ≤ x + y < 1), and 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), in which 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 x Al y Ga 1-x- y Different compositions of N(0 ≤ x ≤ 1, 0 ≤ y ≤ 1, 0 ≤ x + y ≤ 1). In one example, the quantum well layer can include IN x Ga 1-x The composition of N(0 < x ≤ 1), 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, in at least two of the multiple cross-sections of the color conversion unit 2 parallel to the first surface, the area of the cross-section relatively close to the first surface 101 is smaller than the area of the cross-section far from the first surface 101.

[0053] Furthermore, along the direction close 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. Herein, 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 section of the color conversion unit 2 may also be 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 the reflective layer 8 is disposed in the same layer as the first electrode 301. It should be noted that in the present disclosure, "the same layer" of two structures means that the two structures are formed in the same film or prepared by the same patterning process, or 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 it from the first surface, thereby improving the light utilization rate.

[0057] In some embodiments, the color conversion unit 2 is entirely located in the second groove 10, and the light-emitting substrate further includes a first encapsulation layer 5, at least part of which is located on a side of the color conversion unit 2 away from the base substrate 1, for encapsulating the color conversion unit 2. The material of the first encapsulation layer 5 may be an encapsulation material such as silica gel or white oil, and the first encapsulation layer 5 plays a role in protecting the color conversion unit 2. The height of the color conversion unit 2 may be the same as the depth of the second groove 10, that is, the color conversion unit 2 fills the second groove 10. Of course, the height of the color conversion unit 2 may 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 is equal to 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 part 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 part is 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 9, 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 may be a glass cover plate or a cover plate 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 connection layer 7, which is connected to the second electrodes 303 of the plurality of light-emitting devices 3 to form a whole layer structure, and the connection layer 7 is located on the side of the color conversion unit 2 away from the first surface 101. In practical applications, part of the first color light passes through the color conversion unit 2 and is not reflected by the reflection layer 8, and after the connection layer 7 is provided, the light that is not reflected by the reflection layer 8 can be reflected 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 allows 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 to the color conversion unit 2 to the maximum extent, thereby improving the light utilization rate 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 may be a rectangle, and the orthographic projection of the second groove 10 on the first surface 101 may be an annular shape, and the shapes of the inner edge and outer edge of the annular shape are the same as the orthographic projection shape of the first groove 11. In another example, the orthographic projection of the first groove 11 on the first surface 101 may be a circle, and the orthographic projection of the second groove 10 on the first surface 101 may be a circular ring, and the shapes of the inner edge and outer edge of the circular ring are the same as the orthographic projection shape 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 may also be other shapes, and the shapes of the inner edge and outer edge of the orthographic projection of the second groove 10 on the first surface 101 may be the same as or different from the orthographic projection shape of the first groove 11. For example, the orthographic projection of the first groove 11 on the first surface 101 may be a circle, and the orthographic projection of the second groove 10 on the first surface 101 may be an annular shape, in which case the shapes of the inner edge and outer edge of the orthographic projection of the second groove 10 on the first surface 101 are different from the orthographic projection shape of the first groove 10.

[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 a plurality of sections spaced apart from each other, and the plurality of sections are arranged around the first groove 11 .

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

[0065] In some embodiments, 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 may 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 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 shortest 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 A flow chart of a method for manufacturing a light-emitting substrate provided in an embodiment of the present disclosure is shown in FIG. Figure 5 As shown, the method for manufacturing the light-emitting substrate comprises the following steps:

[0071] S1. A plurality of groove groups are formed 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 , wherein at least a portion of the color conversion units 2 are disposed in the second groove 10 .

[0073] S3, forming a plurality of light-emitting devices 3, wherein 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 used for emitting a first color light, and at least a portion of the light-emitting devices 3 is disposed in the first groove 11.

[0074] The materials of the first electrode 301 and the second electrode 303 both include reflective metal and are used to reflect the light emitted by the light-emitting body 302 to 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 not higher than the third surface 304. The first color light and the second color light have different colors.

[0075] 6A to 6F FIG. 1 is a schematic diagram of a structure of a light-emitting substrate during the manufacturing process provided in an embodiment of the present disclosure, such as 6A to 6F As shown, the production method includes:

[0076] S101, such as Fig. 6A As shown, a plurality of first grooves 11 and a plurality of second grooves 10 are etched on the 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 6 and a plurality of first electrodes 301 are formed in sequence. One first electrode 301 is disposed 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 Fig.6D As shown, a passivation layer 6 is formed.

[0080] S105, such as Fig. 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 Fig. 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, including the backlight module in the above embodiment. The display device can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, etc. The display device using the above backlight module can improve the light extraction efficiency and the display effect of the display device.

[0084] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these 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 arranged on the second surface; the groove groups comprise first grooves and second grooves arranged at intervals; A plurality of light-emitting devices, each of which comprises a first electrode, a second electrode and a light-emitting body disposed therebetween, wherein the light-emitting body is used to emit light of a first color; at least a portion of the light-emitting device is 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; Wherein, the material of the first electrode and the material of the second electrode both include reflective metal, 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, characterized in that: 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, characterized in that: The minimum distance from the surface of the first electrode far 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.

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, and the area of ​​the cross section relatively close to the first surface is smaller than the area of ​​the cross section relatively far from the first surface.

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

6. The light emitting substrate according to any one of claims 1 to 3, characterized in that: The light-emitting substrate further comprises: A reflective layer covers the color conversion unit and is disposed in 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 comprises: A first encapsulation layer, at least a portion of which is located on a side of the color conversion unit away from the 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 comprises: a passivation layer, the passivation layer covers the light-emitting body, and a via 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 comprises: 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, characterized in that: 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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