Light-emitting structure, backlight source and display apparatus

Abstract

A light-emitting structure, a backlight source and a display apparatus. The light-emitting structure comprises a substrate (01), and, located on the substrate (01), light-emitting units (100) and light-transmitting protection structures (200), each light-transmitting protection structure (200) being configured to wrap each light-emitting unit (100). The outer surface of each light-transmitting protection structure (200) comprises a first portion (210) and a second portion (220) surrounding the first portion (210), and a boundary position of the first portion (210) and the second portion (220) comprises a first position (201) in the light-transmitting protection structure (200) that is farthest from the substrate (01). Each first portion (210) comprises a recessed portion (211) that is bent towards the side close to each light-emitting unit (100), and the recessed portion (211) comprises a second position (202) in the first portion (210) that is closest to the substrate (01). The thickness of each light-transmitting protection structure (200) at each first position (201) is H, and a maximum thickness of each light-emitting unit (100) in a first direction perpendicular to the substrate (01) is h, H and h satisfying the relationship: 1<H / h<17. By configuring the shape of each light-transmitting protection structure to comprise a recessed portion and configuring the relationship between the maximum thickness of the light-transmitting protection structure and the maximum thickness of a light-emitting unit, the brightness right above the light-emitting unit is reduced, thus achieving uniform picture display.

Description

Light-emitting structure, backlight source, and display device

[0001] This application claims priority to Chinese patent application No. 202310786990.5 filed on June 29, 2023, and the contents of the above-mentioned Chinese patent application disclosure are hereby incorporated by reference in their entirety as a part of this application. Technical Field

[0002] Embodiments of the present disclosure relate to a light-emitting structure, a backlight source, and a display device. Background Art

[0003] Compared to traditional LED backlights, direct-lit sub-millimeter light-emitting diode (Mini LED) backlights enable more partitioning, resulting in high-definition, high-brightness, and detailed image displays. Consequently, Mini LEDs are gaining popularity in the display field, particularly in televisions, and are gaining popularity with a growing number of consumers.

[0004] Summary of the Invention

[0005] The present disclosure provides a light-emitting structure, a backlight source and a display device. The light-emitting structure includes: a substrate, a plurality of light-emitting units located on the substrate and at least one light-transmitting protective structure. The at least one light-transmitting protective structure is configured to wrap at least one light-emitting unit. Each light-transmitting protective structure wraps a light-emitting unit, and the outer surface of the light-transmitting protective structure includes a first portion and a second portion surrounding the first portion. The boundary position between the first portion and the second portion includes a first position in the light-transmitting protective structure that is farthest from the substrate. The first portion includes a recessed portion that is bent toward a side close to the light-emitting unit. The recessed portion includes a second position in the first portion that is closest to the substrate. The thickness of the light-transmitting protective structure at the first position is H, and the maximum thickness of the light-emitting unit in a first direction perpendicular to the substrate is h. H and h satisfy the relationship: 1 <H / h<17。

[0006] For example, according to an embodiment of the present disclosure, in a second direction parallel to the substrate, the distance between the first position and the second position is W, the size of the light-emitting unit in the second direction is L, the maximum size of the light-transmitting protective structure in the second direction is D, and W, L, and D satisfy the relationship: L / 2 <W<D / 2。

[0007] For example, according to an embodiment of the present disclosure, the orthographic projection of the second position on the substrate is located within the orthographic projection of the light emitting unit on the substrate.

[0008] For example, according to an embodiment of the present disclosure, the orthographic projection of the light-emitting unit on the substrate has a first shape, and the shortest distance between the second position and a straight line passing through the light-emitting center of the light-emitting unit and perpendicular to the substrate is greater than or equal to 0 and less than or equal to half the size of the first shape.

[0009] For example, according to an embodiment of the present disclosure, the difference between H and the thickness of the light-transmitting protective structure at the second position is Hm, and Hm / H<0.5.

[0010] For example, according to an embodiment of the present disclosure, the dimension of the portion of the light-transmitting protection structure with a thickness of H / 2 along the second direction is D', and D' and L satisfy the relationship: 3.5≤D' / L≤12.5.

[0011] For example, according to an embodiment of the present disclosure, D and L satisfy the relationship: 3≤D / L≤13.5.

[0012] For example, according to an embodiment of the present disclosure, the light-emitting unit includes a light-emitting diode chip, and the outer surface of the light-transmitting protection structure covering the light-emitting unit includes a free-form surface.

[0013] For example, according to an embodiment of the present disclosure, the outer surface of the light-transmitting protection structure between the second position and the first position includes at least one curved surface and / or at least one flat surface.

[0014] For example, according to an embodiment of the present disclosure, the at least one light-transmitting protective structure includes a plurality of light-transmitting protective structures, and each of at least some of the light-emitting units of the plurality of light-emitting units is wrapped by a light-transmitting protective structure; the substrate includes a first area and a second area located on at least one side of the first area, and the at least some of the light-emitting units include a first light-emitting unit located in the first area and a second light-emitting unit located in the second area. The plurality of light-transmitting protective structures include a first light-transmitting protective structure wrapping the first light-emitting unit and a second light-transmitting protective structure wrapping the second light-emitting unit. A straight line passing through the light-emitting center of the first light-emitting unit and perpendicular to the substrate passes through the second position of the first light-transmitting protective structure, and the positive projection of the second light-emitting unit on the substrate has a second shape. The shortest distance between the second position and the straight line passing through the light-emitting center of the second light-emitting unit and perpendicular to the substrate is greater than 0 and less than or equal to half the size of the second shape.

[0015] For example, according to an embodiment of the present disclosure, the shape of the positive projection of at least one light-emitting unit on the substrate includes a rectangle, and two adjacent sides of the rectangle extend along the second direction and the third direction respectively; the light-transmitting protection structure includes a second position and multiple first positions, and the multiple first positions surround the one second position. The ratio of the distance between the second position and the first position in the second direction to the distance between the second position and the first position in the third direction is 0.8 to 1.2, and the ratio of the distance between different first positions and the substrate is 0.8 to 1.2.

[0016] For example, according to an embodiment of the present disclosure, the distances between the plurality of first positions and the substrate are all the same.

[0017] For example, according to an embodiment of the present disclosure, the plurality of first positions form a circle or an ellipse along a clockwise line.

[0018] For example, according to the embodiment of the present disclosure, Hm satisfies: 0 mm <Hm≤1.2mm。

[0019] For example, according to an embodiment of the present disclosure, H satisfies: 0.5 mm ≤ H ≤ 2 mm.

[0020] For example, according to an embodiment of the present disclosure, D satisfies: 7 mm ≤ D ≤ 10 mm.

[0021] For example, according to an embodiment of the present disclosure, the light-emitting structure further includes a reflective layer located on a side of the substrate where the light-emitting units are located. The reflective layer includes a plurality of openings, each corresponding to each of the light-emitting units. A dimension of at least one of the openings is D0, and D0 and D satisfy the relationship: 1.2 ≤ D0 / D ≤ 1.5.

[0022] For example, according to an embodiment of the present disclosure, the material of the light-transmitting protective structure includes organic silicone, the refractive index of the light-transmitting protective structure is 1.3 to 1.7, and the transmittance is greater than 80%.

[0023] For example, according to an embodiment of the present disclosure, the light emitting unit has a light emission wavelength of 430 to 480 nanometers, and the light-transmitting protective structure includes an inorganic light-emitting material.

[0024] Another embodiment of the present disclosure provides a backlight source including any of the above-mentioned light-emitting structures.

[0025] Another embodiment of the present disclosure provides a display device, comprising any of the above-mentioned light-emitting structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, rather than limiting the present disclosure.

[0027] FIG1 is a schematic diagram of a partial cross-sectional structure of a light-emitting structure.

[0028] FIG2 is a schematic diagram of a partial cross-sectional structure of a light-emitting structure provided according to an embodiment of the present disclosure.

[0029] FIG3 is a plan view of a light-emitting unit in the light-emitting structure shown in FIG2 and a light-transmitting protective structure wrapping the light-emitting unit.

[0030] FIG4 is a diagram showing the light intensity distribution of the light emitting unit in different settings.

[0031] FIG5 is a schematic structural diagram of the light-transmitting protective structure at the second position at different thicknesses.

[0032] FIG. 6 is a light pattern curve of light emitted from the light-transmitting protective structure of different thicknesses shown in FIG. 5 .

[0033] FIG. 7 is a planar structure of a light emitting structure provided according to another example of an embodiment of the present disclosure.

[0034] FIG8 is a schematic diagram of a partial cross-sectional structure taken along line AA′ shown in FIG7 .

[0035] FIG9 is a schematic diagram of a partial structure of a light-emitting structure provided according to another example of an embodiment of the present disclosure.

[0036] FIG10 is a schematic diagram of a partial cross-sectional structure of a backlight source provided according to another embodiment of the present disclosure.

[0037] FIG11 is a schematic diagram of a partial cross-sectional structure of a display device according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0039] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the ordinary meaning understood by a person of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are simply used to distinguish different components. The terms "include" or "comprises" and similar terms mean that the element or object preceding the term includes the elements or objects listed after the term and their equivalents, without excluding other elements or objects. The characteristics of "parallel," "perpendicular," and "same" used in the embodiments of this disclosure include the characteristics of "parallel," "perpendicular," and "same" in the strict sense, as well as "approximately parallel," "approximately perpendicular," and "approximately the same" that include certain errors, taking into account the errors associated with the measurement of specific quantities (for example, the limitations of the measurement system), and represent the acceptable deviation range for a specific value determined by a person of ordinary skill in the art. For example, "approximately" can mean within one or more standard deviations, or within 10% or 5% of the stated value. When the number of a component is not specifically specified below in the embodiments of this disclosure, it means that the component can be one or more, or can be understood as at least one. "At least one" means one or more, and "a plurality" means at least two.

[0040] Direct-lit backlights utilize multiple light-emitting diodes (LEDs), such as mini LEDs, to achieve uniform display across the entire screen. The performance of a display device with a direct-lit backlight depends not only on the optical mixing distance (OD) and the pitch of adjacent LEDs within the backlight, but also on the LED light pattern.

[0041] Figure 1 is a schematic diagram of a partial cross-sectional structure of a light-emitting structure. As shown in Figure 1, during the manufacturing process of a backlight source using Mini LEDs, Mini LEDs 12 are soldered to a substrate 11 through die bonding. For example, Mini LEDs 12 include soldering metal 14, such as pins, which are connected to pads 15 on substrate 11. To prevent the Mini LED chips from being exposed to the air and damaged by dirt, a convex or roughly dome-shaped silicone rubber 13 is typically provided on the surface of each Mini LED. Because silicone rubber has a certain refractive index, such as 1.5, which is greater than that of air, light emitted by the Mini LED is refracted when passing through the silicone rubber into air or other media, causing the secondary light pattern of the light emitted by the LED to change when it exits the silicone rubber.

[0042] During research, the inventors of this application discovered that in television (TV) backlight design, in order to maintain a certain optical mixing distance (OD: Optical distance), costs can be controlled by increasing the arrangement distance (Pitch) of adjacent LEDs. At a certain pitch, the thickness of the backlight module can be reduced by reducing the OD. Under certain combinations of OD and Pitch, the top LED lights will be bright and the middle LED lights will be dark, resulting in bright and dark stripes on the entire backlight screen, making it impossible to achieve a uniform picture display. Through the analysis of the secondary light type of the LED, it can be seen that the light intensity of the LED at the intermediate angle is not small enough.

[0043] The present disclosure provides a light-emitting structure, a backlight source, and a display device. The light-emitting structure includes a substrate, a plurality of light-emitting units located on the substrate, and at least one light-transmitting protective structure, wherein the at least one light-transmitting protective structure is configured to wrap at least one light-emitting unit. Each light-transmitting protective structure wraps a light-emitting unit, and the outer surface of the light-transmitting protective structure includes a first portion and a second portion surrounding the first portion. The boundary position between the first portion and the second portion includes a first position in the light-transmitting protective structure that is farthest from the substrate, the first portion includes a recessed portion that is bent toward a side close to the light-emitting unit, and the recessed portion includes a second position in the first portion that is closest to the substrate. The thickness of the light-transmitting protective structure at the first position is H, and the maximum thickness of the light-emitting unit in a first direction perpendicular to the substrate is h. H and h satisfy the relationship: 1 <H / h<17。

[0044] The light-emitting structure provided by the present disclosure, by setting the shape of the light-transmitting protective structure that wraps the light-emitting unit to include a recessed portion, and setting the relationship between the maximum thickness of the light-transmitting protective structure and the maximum thickness of the light-emitting unit, is conducive to realizing a specific secondary light-type design of the light-emitting unit, reducing the brightness directly above the light-emitting unit, thereby reducing the brightness difference above the light-emitting unit and between adjacent light-emitting units, and achieving uniform picture display.

[0045] The light emitting structure, backlight source and display device provided by the embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0046] FIG2 is a schematic diagram of a partial cross-sectional structure of a light-emitting structure provided according to an embodiment of the present disclosure. FIG3 is a plan view of a light-emitting unit in the light-emitting structure shown in FIG2 and a light-transmitting protective structure encapsulating the light-emitting unit. As shown in FIG2 , the light-emitting structure includes a substrate 01, a plurality of light-emitting units 100 located on the substrate 01, and at least one light-transmitting protective structure 200, wherein the at least one light-transmitting protective structure 200 is configured to encapsulate at least one light-emitting unit 100. FIG2 schematically illustrates two light-emitting units 100 arranged along the Y direction, but is not limited thereto. The light-emitting structure may include more light-emitting units arranged along the Y direction.

[0047] For example, as shown in FIG2 , the substrate 01 may be a printed circuit board (PCB) or glass, plastic, polyimide, polymethyl methacrylate, etc. with circuits.

[0048] For example, as shown in FIG2 , a buffer layer (Buffer) 02 is provided on a substrate 01. For example, a pad 310 is provided on a side of the buffer layer 02 away from the substrate 01. The light-emitting unit 100 includes a pin 110 and a light-emitting body 120. The pin 110 of the light-emitting unit 100 is electrically connected to the pad 310. For example, a passivation layer (PVX) 03 is further provided on a side of the buffer layer 02 away from the substrate 01. For example, the material of the passivation layer 03 includes an insulating material, and the passivation layer 03 includes an opening that exposes the pad 310 so that the pin 110 of the light-emitting unit 100 can be electrically connected to the pad 310 exposed by the passivation layer 03.

[0049] As shown in Figure 2, each light-transmitting protective structure 200 wraps a light-emitting unit 100. For example, the light-transmitting protective structure 200 can wrap the portion of the light-emitting unit 100 except for the surface where the pin 110 is electrically connected to the pad 310, so as to encapsulate and protect the unpackaged light-emitting unit. For example, the light-transmitting protective structure 200 is in direct contact with the light-emitting unit 100, such as the surface and side surface of the light-emitting unit 100 away from the substrate 01 are in direct contact with the light-transmitting protective structure 200. For example, there may be no gap between the light-transmitting protective structure 200 and the light-emitting unit 100 to avoid light reflection between the light-emitting unit and the light-transmitting protective structure. For example, the light-transmitting protective structure 200 can be in contact with the surface of the passivation layer 03 away from the substrate 01, such as the surface of the light-transmitting protective structure 200 closest to the substrate 01 can be the surface of the light-transmitting protective structure 200 in contact with the passivation layer 03. Of course, the embodiments of the present disclosure are not limited to this, and other film layers can also be provided on the side of the passivation layer away from the substrate, and the light-transmitting protective structure can be in contact with the surface of the other film layer away from the substrate. For example, the light emitted by the light-emitting unit 100 is refracted by the light-transmitting protection structure 200 and then emitted. The shape of the light-transmitting protection structure 200 may determine the secondary light pattern of the light-emitting unit 100 .

[0050] As shown in Figure 2, the outer surface of the transparent protective structure 200 includes a first part 210 and a second part 220 surrounding the first part 210. For example, the first part 210 and the second part 220 are an integrated structure. For example, the geometric center of the orthographic projection of the transparent protective structure 200 on the substrate 01 can be located within the orthographic projection of the first part 210 on the substrate 01. For example, the shape of the orthographic projection of the first part 210 on the substrate 01 can be circular or elliptical, and the shape of the orthographic projection of the second part 220 on the substrate 01 can be annular, such as a circular ring or an elliptical ring. For example, the annular orthographic projection of the second part 220 on the substrate 01 can be a shape with a uniform ring width, but is not limited to this. According to product requirements, the ring width of the annular orthographic projection of the second part on the substrate can also be set to be larger in some positions and smaller in some positions.

[0051] As shown in Figures 2 and 3, the boundary between the first portion 210 and the second portion 220 includes the first position 201 in the light-transmitting protective structure 200 that is farthest from the substrate 01. For example, the boundary between the first portion 210 and the second portion 220 can be a circle of first positions 201. For example, the first position 201 is the position in the first portion 201 that is farthest from the substrate 01, and the first position 201 is also the position in the second portion 220 that is farthest from the substrate 01. For example, the position in the second portion 220 that is closest to the substrate 01 is the edge position of the light-transmitting protective structure 200. For example, the light-transmitting protective structure 200 includes a circle of raised structures, and the circle of raised structures includes a circle of highest points, such as a circle of highest points including multiple first positions 201.

[0052] In some examples, as shown in Figures 2 and 3, the light-transmitting protective structure 200 includes a second position 202 and a plurality of first positions 201 surrounding the second position 202, wherein the ratio of the distances between different first positions 201 and the substrate 01 is 0.8 to 1.2. For example, the different first positions 201 can be different points, and a line connecting all the first positions 201 in a clockwise direction forms a circle of first positions 201. For example, the ratio of the distances between different first positions 201 and the substrate 01 is 0.9 to 1.1.

[0053] In some examples, as shown in Figures 2 and 3, the distances between different first positions 201 and the substrate 01 are the same, which not only facilitates the production of the light-transmitting protection structure, but also helps the light-transmitting protection structure to perform basically the same secondary light pattern change on the light emitted by the light-emitting unit in at least some directions, such as in two directions.

[0054] In some examples, as shown in FIG. 2 and FIG. 3 , the plurality of first positions 201 are connected along a clockwise line to form a circle or an ellipse.

[0055] As shown in FIG. 2, the first part 210 includes a recessed portion 211 that is bent toward the side closer to the light-emitting unit 100. The recessed portion 211 includes a second position 202 that is the closest to the substrate 01 in the first part 201. The thickness of the light-transmitting protection structure 200 at the first position 201 is H, and the maximum thickness of the light-emitting unit 100 in the first direction perpendicular to the substrate 01, such as the X direction, is h. H and h satisfy the relationship: 1 < H / h < 17. For example, H and h satisfy the relationship: 2 < H / h < 10. For example, the thickness of the light-transmitting protection structure 200 at the first position 201 may refer to the distance between the first position 201 and the surface of the light-transmitting protection structure 200 closest to the substrate 01, that is, the surface of the light-transmitting protection structure 200 in contact with the passivation layer 03 shown in FIG. 2. It can be understood that there should be a certain distance between the second position 202 and the surface of the light-emitting unit 100 away from the substrate 01, that is, the distance between the second position 202 and the substrate 01 is greater than the distance between the surface of the light-emitting unit 100 away from the substrate 01 and the substrate 01.

[0056] In the optical structure provided by the present disclosure, the light-transmitting protection structure that wraps the light-emitting unit serves as a secondary optical light distribution lens for the light-emitting unit. By setting the shape of the light-transmitting protection structure to include a recessed portion and setting the relationship between the maximum thickness of the light-transmitting protection structure and the maximum thickness of the light-emitting unit, it is beneficial to achieve a specific secondary light pattern design of the light-emitting unit, reduce the brightness directly above the light-emitting unit, and reduce the brightness difference between the area above the light-emitting unit and adjacent light-emitting units, thereby achieving a uniform picture display.

[0057] FIG. 2 schematically shows that a light-transmitting protection structure 200 including a recessed portion is provided on the side of each light-emitting unit 100 away from the substrate 01. However, this is not limited thereto. There may also be at least one light-emitting unit (such as the light-emitting units in a certain area of the light-emitting structure) whose light-transmitting protection structure provided on the side away from the substrate does not include a recessed portion. For example, the shape of the light-transmitting protection structure may be substantially dome-shaped like the silicone 13 shown in FIG. 1. For example, the light-emitting structure includes a plurality of light-transmitting protection structures, and the plurality of light-transmitting protection structures include a first sub-light-transmitting protection structure and a second sub-light-transmitting protection structure. The first sub-light-transmitting protection structure includes the above-mentioned recessed portion, and the second sub-light-transmitting protection structure includes a dome shape. The first sub-light-transmitting protection structure is distributed in the first sub-area of the light-emitting structure, and the second sub-light-transmitting protection structure is distributed in the second sub-area of the light-emitting structure. For example, the first sub-area may be the central area including the geometric center of the substrate, and the second sub-area is the area surrounding the first sub-area; or, the second sub-area may be the central area including the geometric center of the substrate, and the first sub-area is the area surrounding the second sub-area.

[0058] Figure 4 shows the light intensity distribution of the light-emitting unit in different settings. As shown in Figure 4, the horizontal axis represents the light-emitting unit's luminous angle, with 0° representing the exact center of the light-emitting unit. The angle of light emitted by the light-emitting unit is negative if it is directed toward the negative pole of the two pins, and positive if it is directed toward the positive pole of the two pins. The vertical axis represents the normalized intensity of the light emitted by the light-emitting unit at the corresponding angle.

[0059] For example, as shown in Figure 4, LD1 represents the light intensity distribution of the light-emitting unit in the light-emitting structure shown in Figure 2 when it is not wrapped by the transparent protective structure, LD2 represents the light intensity distribution of the light-emitting unit in the light-emitting structure shown in Figure 2 when it is wrapped by the dome-shaped transparent protective structure shown in Figure 1, and LD3 represents the light intensity distribution of the light-emitting unit in the light-emitting structure shown in Figure 2 when it is wrapped by the transparent protective structure 200 shown in Figure 2.

[0060] For example, as shown in Figure 4, the light-emitting surface of the light-emitting unit 100 can be provided with a dimming structure, such as a reflective film, to reduce the light intensity directly above the light-emitting unit 100. For example, the light intensity at a 0-degree emitting angle of the light-emitting unit 100 is lower than the light intensity at a 70-degree emitting angle. For example, the light intensity distributions shown in LD1, LD2, and LD3 all exhibit a batwing light distribution characteristic. For example, a batwing light distribution characteristic is defined as a light distribution with a luminous intensity greater than 0 degrees within the optical axis passing through the geometric center of the light-emitting unit 100 as 0 degrees.

[0061] For example, as shown in FIG4 , the light intensity of LD3 within ±70 degrees is smaller than the light intensity of LD1 and LD2 within the light emitting angle range.

[0062] Compared with not setting a light-transmitting protective structure, or setting the shape of the light-transmitting protective structure that wraps the light-emitting unit to the dome shape shown in Figure 1, the optical structure provided by the present disclosure can further reduce the light intensity at the middle angle of the light-emitting unit by setting a recessed portion in the first portion directly opposite the light-emitting unit, and setting the thickness relationship between the light-emitting unit and the light-transmitting protective structure, which is beneficial to reducing the light intensity at the middle angle of the light-emitting unit, such as helping to reduce the light intensity within ±50 degrees in the light emitted by the light-emitting unit after passing through the light-transmitting protective structure, thereby reducing the light intensity difference between the light-emitting unit directly above and the adjacent light-emitting unit, solving the problem of bright and dark stripes when the light-emitting structure is used for display, and improving the light output uniformity of the optical structure to achieve uniform picture display.

[0063] For example, as shown in Figure 2, H and h satisfy the relationship: 2≤H / h≤5. For example, H and h satisfy the relationship: 3≤H / h≤7. For example, H and h satisfy the relationship: 4≤H / h≤6. For example, H and h satisfy the relationship: 3.5≤H / h≤8.

[0064] For example, as shown in FIG. 2, in the present disclosure, the maximum thickness h of the light-emitting unit 100 may refer to the dimension in the direction perpendicular to the plane of the substrate, including the light-emitting body 120 and the pins 110. Of course, the present disclosure is not limited thereto, and the maximum thickness of the light-emitting unit may also refer to the part of the light-emitting unit 100 that does not include the pins 110, such as the maximum thickness of the light-emitting body.

[0065] For example, as shown in FIG. 2, the thickness h of the light-emitting unit 100 may be no greater than 2 mm. For example, it may be 1 mm, 0.75 mm, 0.6 mm, 0.15 mm, or 0.1 mm. For example, the thickness h of the light-emitting unit 100 may be 70 μm to 180 μm.

[0066] In some examples, as shown in FIG. 2, the maximum thickness H of the light-transmitting protection structure 200 satisfies: 0.5 mm ≤ H ≤ 2 mm. For example, H satisfies: 0.6 mm ≤ H ≤ 1.5 mm. For example, H satisfies: 0.7 mm ≤ H ≤ 1.8 mm. For example, H satisfies: 1 mm ≤ H ≤ 1.2 mm. For example, H satisfies: 0.8 mm ≤ H ≤ 1.7 mm.

[0067] In some examples, as shown in FIG. 2, the difference between H and the thickness of the light-transmitting protection structure 200 at the second position 202 is Hm, and Hm / H < 0.5.

[0068] For example, as shown in FIG. 2, the distance between the plane of the second position 202 (the plane perpendicular to the X direction) and the plane of the first position 201 (the plane perpendicular to the X direction) may be Hm. For example, Hm / H < 0.48. For example, Hm / H < 0.45. For example, Hm / H < 0.4. For example, Hm / H < 0.35. For example, Hm / H < 0.3.

[0069] In some examples, as shown in FIG. 2, Hm satisfies: 0 mm < Hm ≤ 1.2 mm. For example, 0.1 mm ≤ Hm ≤ 0.5 mm.

[0070] FIG. 5 is a schematic structural diagram of the light-transmitting protection structure at the second position with different thicknesses. FIG. 6 is a light pattern curve of the light emitted from the light-transmitting protection structures with different thicknesses shown in FIG. 5.

[0071] For example, as shown in Figures 2, 5 and 6, the light intensity of the light emitting unit 100 (such as a bare core) without a light-transmitting protective structure 200 on the light-emitting side at 0° is greater than the light intensity of the light emitting unit 100 with a light-transmitting protective structure 200 on the light-emitting side at 0°. For example, compared to the case where no light-transmitting protective structure is provided on the light-emitting side of the light-emitting unit 100, by providing a light-transmitting protective structure 200 with a recessed portion 211 on the light-emitting side of the light-emitting unit 100, the brightness directly above the light-emitting unit can be reduced while the angle of the position of the maximum light intensity of the light emitted from the light-transmitting protective structure 200 can be expanded by at least 10 degrees, thereby increasing the light intensity of the area between adjacent light-emitting units. For example, by providing a light-transmitting protective structure 200 with a recessed portion 211 on the light-emitting side of the light-emitting unit 100, the brightness directly above the light-emitting unit can be reduced while the angle of the position of the maximum light intensity of the light emitted from the light-transmitting protective structure 200 can be expanded by at least 15 degrees. For example, by providing a light-transmitting protective structure 200 having a recessed portion 211 on the light-emitting side of the light-emitting unit 100, the brightness directly above the light-emitting unit can be reduced while the angle of the position where the light intensity of the light emitted from the light-transmitting protective structure 200 is maximum can be expanded by at least 20 degrees.

[0072] For example, as shown in Figures 5 and 6, the height difference Hm between the first position 201 and the second position 202 of the light-transmitting protective structure 200-1 is 0.1 mm, the height difference Hm between the first position 201 and the second position 202 of the light-transmitting protective structure 200-2 is 0.2 mm, the height difference Hm between the first position 201 and the second position 202 of the light-transmitting protective structure 200-3 is 0.3 mm, the height difference Hm between the first position 201 and the second position 202 of the light-transmitting protective structure 200-4 is 0.4 mm, and the height difference Hm between the first position 201 and the second position 202 of the light-transmitting protective structure 200-5 is 0.5 mm. For example, the light intensity of the light emitted from the light-transmitting protective structure 200-5 is the lowest at 0°.

[0073] In some examples, as shown in FIG. 2 , the outer surface of the light-transmitting protection structure 200 covering the light-emitting unit 100 includes a free-form surface.

[0074] In some examples, as shown in FIG2 , the outer surface of the light-transmitting protective structure 200 between the second position 202 and the first position 201 includes at least one curved surface and / or at least one flat surface. For example, the surface of the light-transmitting protective structure 200 between the second position 202 and the first position 201 may be an annular curved surface. For example, the distance between the surface and the substrate 01 gradually increases from the second position 202 to the first position 201.

[0075] For example, Figure 2 schematically shows that the section of the surface between the first position 201 and the second position 202 cut by the XY plane is a curve that bends toward the side away from the substrate 01, but is not limited to this. For example, the shape of the section of the surface between the first position and the second position cut by the XY plane can be a straight line, a broken line, or a curve that bends toward the side close to the substrate, etc., which can be set according to actual light type requirements.

[0076] For example, Figure 2 schematically shows that there is a peak (first position 201) between the second position 202 and the edge of the light-transmitting protective structure 200, but is not limited to this. There may also be two or more peaks between the second position and the edge of the light-transmitting protective structure. Among the multiple peaks, the peak farthest from the substrate is the peak where the first position is located, or the distances between the multiple peaks and the substrate may be equal, then the peak closest to the center of the light-transmitting protective structure among the multiple peaks is the peak where the first position is located.

[0077] For example, as shown in FIG. 2 , a straight line passing through the second position 202 and perpendicular to the substrate 01 is used as the central axis of the light-transmitting protection structure 200 , and cross sections of the light-transmitting protection structure 200 taken along the XY plane are symmetrically distributed relative to the central axis.

[0078] For example, as shown in FIG2 , the second position 202 may be a point on the surface of the light-transmitting protective structure 200, such as the lowest point of the recessed portion 211. However, the second position is not limited thereto and may also be a plane, such as one with a very small area, such as less than 10% of the area of ​​the light-emitting unit.

[0079] In some examples, as shown in Figures 2 and 3, the orthographic projection of the second position 202 on the substrate 01 is located within the orthographic projection of the light-emitting unit 100 on the substrate 01. By arranging the orthographic projection of the second position of the light-transmitting protective structure that encloses at least a portion of the light-emitting unit on the substrate within the orthographic projection of the light-emitting unit on the substrate, it is advantageous to achieve substantially symmetrical modulation of light emitted from at least a portion of the light-transmitting protective structure.

[0080] In some examples, as shown in Figures 2 and 3, the orthographic projection of the light-emitting unit 100 on the substrate 01 has a first shape, and the shortest distance between the second position 202 and a line passing through the light-emitting center of the light-emitting unit 100 and perpendicular to the substrate 01 is greater than or equal to 0 and less than or equal to half the size of the first shape. For example, the size of the first shape can be a size along the Y direction, or a size along the Z direction, and the size can be a size along the extension direction of the line connecting the second position and the line passing through the light-emitting center of the light-emitting unit. For example, when the first shape is a polygon, the size of the first shape is the length of the diagonal of the polygon or the length of any side of the polygon; when the first shape is a circle, the size of the first shape is the diameter of the circle; when the first shape is an ellipse, the size of the first shape is the major axis or minor axis of the ellipse.

[0081] For example, as shown in Figures 2 and 3, a straight line passing through the light emitting center of the light emitting unit 100 and perpendicular to the substrate 01 passes through the second position 202. For example, the light emitting center of the light emitting unit 100 may be the center of the light emitting surface of the light emitting unit 100, such as the optical axis of the light emitting unit 100 perpendicular to the substrate 01 passes through the light emitting center of the light emitting unit 100 and the second position 202 of the light-transmitting protective structure 200.

[0082] By arranging the second position of the light-transmitting protection structure to be directly opposite to the light-transmitting center of the light-emitting unit, it is advantageous to perform substantially completely symmetrical modulation on the light emitted from the light-transmitting protection structure.

[0083] In some examples, as shown in FIG2 , in a second direction parallel to the substrate 01 , such as the Y direction, the distance between the first position 201 and the second position 202 is W, the size of the light-emitting unit 100 in the second direction is L, and the maximum size of the light-transmitting protective structure 200 in the second direction is D. W, L, and D satisfy the relationship: L / 2 <W<D / 2。

[0084] By setting the relationship between the size of the light-emitting unit in the direction parallel to the substrate, the distance between the highest point and the lowest point of the first part of the light-transmitting protective structure in the direction parallel to the substrate, and the size of the light-transmitting protective structure in the direction parallel to the substrate, the light type of the light emitted by the light-emitting unit after passing through the light-transmitting protective structure can be adjusted, which is beneficial to reducing the light intensity within ±50 degrees in the light emitted by the light-emitting unit after passing through the light-transmitting protective structure, thereby reducing the light intensity difference between the light-emitting unit directly above and the adjacent light-emitting unit, solving the problem of bright and dark stripes when the light-emitting structure is used for display, and improving the light uniformity of the optical structure to achieve uniform picture display.

[0085] For example, as shown in FIG2 , W, L, and D satisfy the relationship: 0.4*L <W<0.45*D。

[0086] In some examples, as shown in Figure 2, D and L satisfy the relationship: 3 ≤ D / L ≤ 13.5. By setting the maximum value of D / L to no greater than 8, the reflector can be maximized to maintain a certain reflectivity. By setting the minimum value of D / L to no less than 3, the uniform light effect of the light-emitting structure can be maximized.

[0087] For example, as shown in Figure 2, D and L satisfy the relationship: 3.5 ≤ D / L ≤ 5. For example, D and L satisfy the relationship: 4 ≤ D / L ≤ 7. For example, D and L satisfy the relationship: 4.5 ≤ D / L ≤ 6. For example, D and L satisfy the relationship: 3.5 ≤ D / L ≤ 8.

[0088] In some examples, as shown in FIG2 , D satisfies: 4 mm ≤ D ≤ 10 mm. For example, D satisfies: 5 mm ≤ D ≤ 9.5 mm. For example, D satisfies: 6 mm ≤ D ≤ 13.5 mm. For example, D satisfies: 5 mm ≤ D ≤ 7.5 mm.

[0089] For example, as shown in FIG2 , D satisfies: 8 mm ≤ D ≤ 9.5 mm. For example, D satisfies: 7.5 mm ≤ D ≤ 9 mm.

[0090] In some examples, as shown in FIG2 , the portion of the light-transmitting protection structure 200 having a thickness of H / 2 in a first direction, such as the X direction, has a dimension D' along a second direction, such as the Y direction, where D' and L satisfy the relationship: 3.5≤D' / L≤12.5. For example, D' and L satisfy the relationship: 3.5≤D' / L≤5.

[0091] By setting the relationship between the size of the light-emitting unit in a direction parallel to the substrate, the distance between the highest point and the lowest point of the first part of the light-transmitting protective structure in a direction parallel to the substrate, and the size relationship between the light-emitting unit and the light-transmitting protective structure at a position where the thickness is half in a direction parallel to the substrate, the light type of the light emitted by the light-emitting unit after passing through the light-transmitting protective structure can be adjusted, which is beneficial to reducing the light intensity within ±50 degrees in the light emitted by the light-emitting unit after passing through the light-transmitting protective structure, thereby reducing the light intensity difference between the light-emitting unit directly above and the adjacent light-emitting unit, solving the problem of bright and dark stripes when the light-emitting structure is used for display, and improving the uniformity of light output of the optical structure to achieve uniform picture display.

[0092] For example, as shown in Figure 2, D' and L satisfy the relationship: 3.7≤D' / L≤4.5. For example, D' and L satisfy the relationship: 4≤D' / L≤4.8. For example, D' and L satisfy the relationship: 3.5≤D' / L≤12.5.

[0093] In some examples, as shown in FIG2 , the light-emitting unit 100 includes a light-emitting diode chip. For example, the light-emitting unit 100 may be an unpackaged light-emitting diode chip. For example, the light-emitting diode may be a sub-millimeter light-emitting diode (Mini LED) or a micro light-emitting diode (Micro LED). For example, each light-emitting unit 100 may include a p-electrode, a p-type semiconductor layer, an n-electrode, an n-type semiconductor layer, and a light-emitting layer. Holes and electrons are injected from the n-electrode and the p-electrode into the n-type semiconductor layer and the p-type semiconductor layer, respectively, and recombine in the light-emitting layer, releasing energy in the form of photons. The emission wavelength depends on the band gap width of the light-emitting material.

[0094] For example, as shown in FIG2 , the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 is no greater than 3 mm. For example, the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 is no greater than 500 microns. For example, the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 is no greater than 300 microns. For example, the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 is no greater than 250 microns. For example, the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 is no greater than 220 microns. For example, the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 is no greater than 200 microns. For example, the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 is no greater than 150 microns.

[0095] For example, as shown in FIG3 , the outline of the orthographic projection of the light-emitting unit 100 on the substrate 01 can be a rectangle, and the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 can be the diagonal of the light-emitting unit 100. Of course, the embodiments of the present disclosure are not limited to this. For example, the outline of the orthographic projection of the light-emitting unit on the substrate can be a circle, and the maximum dimension of the light-emitting unit in a direction parallel to the substrate can be the diameter of the light-emitting unit; for example, the outline of the orthographic projection of the light-emitting unit on the substrate can be an ellipse, and the maximum dimension of the light-emitting unit in a direction parallel to the substrate can be the long axis of the light-emitting unit. However, the planar shape of the light-emitting unit is not limited to this, and the side length of the planar shape of the light-emitting unit is also not greater than 3 mm.

[0096] In some examples, as shown in Figures 2 and 3, the orthographic projection of at least one light-emitting unit 100 on the substrate 01 includes a rectangular shape, with two adjacent sides of the rectangle extending along a second direction, such as the Y direction, and a third direction, such as the Z direction. For example, the orthographic projection of the light-emitting unit 100 on the substrate 01 may be a rectangular shape, but the embodiments of the present disclosure are not limited thereto, and the orthographic projection of the light-emitting unit on the substrate may also be a square shape.

[0097] In some examples, as shown in Figures 2 and 3, the ratio of the distance W1 between the second position 202 and the first position 201 in the second direction to the distance W2 between the second position 202 and the first position 201 in the third direction is 0.8 to 1.2. For example, the ratio of the distance W1 between the second position 202 and the first position 201 to the distance W2 between the second position 202 and the first position 201 is 0.9 to 1.1. For example, the distance W1 between the second position 202 and the first position 201 is equal to the distance W2 between the second position 202 and the first position 201, which facilitates the light-transmitting protective structure to achieve substantially the same secondary light pattern change on the light emitted by the light-emitting unit in the above two directions.

[0098] For example, when the shape of the positive projection of the light-emitting unit 100 on the substrate 01 is a rectangle, and the above-mentioned distance W1 and distance W2 are set to be equal, the light type difference of the light-emitting unit in the long side direction and the short side direction of the rectangle can be compensated by controlling the arrangement spacing of multiple light-emitting units along the long side direction and the short side direction of the light-emitting unit.

[0099] For example, as shown in Figures 2 and 3, the difference between the thickness at first position 201 located on one side of second position 202 in the second direction and the thickness at second position 202 is Hm1, and the difference between the thickness at first position 201 located on one side of second position 202 in the third direction and the thickness at second position 202 is Hm2. The ratio of Hm1 to Hm2 is 0.8 to 1.2. For example, the ratio of Hm1 to Hm2 is 0.9 to 1.1. For example, Hm1 and Hm2 are the same.

[0100] For example, as shown in Figures 2 and 3 , the orthographic projection of at least one light-transmitting protective structure 200 on substrate 01 is circular. However, this is not limiting. For example, the orthographic projection of at least one light-transmitting protective structure on substrate 01 may be elliptical. For example, the orthographic projection of the annular first position 201 on substrate 01 may be the same as the orthographic projection of the light-transmitting protective structure 200 on substrate 01.

[0101] Fig. 7 is a planar structure of a light emitting structure provided according to another example of an embodiment of the present disclosure. Fig. 8 is a schematic diagram of a partial cross-sectional structure taken along line AA' shown in Fig. 7 .

[0102] In some examples, as shown in Figures 7 and 8, the at least one light-transmitting protective structure 200 includes a plurality of light-transmitting protective structures 200, and each light-emitting unit 100 in at least some of the light-emitting units 100 is wrapped by one light-transmitting protective structure 200. For example, each light-emitting unit 100 in all the light-emitting units 100 is wrapped by one transparent protective structure 200.

[0103] In some examples, as shown in FIG7 , substrate 01 includes a first region 011 and a second region 012 located on at least one side of first region 011. For example, first region 011 may be a region including the geometric center of substrate 01. For example, first region 011 may be a regular shape such as a rectangle or a circle, or an irregular shape. For example, second region 012 may be a region of substrate 01 excluding first region 011. For example, second region 012 surrounds first region 011.

[0104] In some examples, as shown in Figure 7, the light-emitting unit 100 includes a first light-emitting unit 101 located in the first area 011 and a second light-emitting unit 102 located in the second area 012, and the multiple light-transmitting protection structures 200 include a first light-transmitting protection structure 221 wrapping the first light-emitting unit 101 and a second light-transmitting protection structure 222 wrapping the second light-emitting unit 102.

[0105] For example, as shown in Figure 7, the shape of the orthographic projection of the first light-transmitting protection structure 221 on the substrate 01 can be the same as the shape of the orthographic projection of the second light-transmitting protection structure 222 on the substrate 01, but is not limited to this. The shape of the orthographic projection of the first light-transmitting protection structure on the substrate can be different from the shape of the orthographic projection of the second light-transmitting protection structure on the substrate to change the secondary light type of the light-emitting units in different areas.

[0106] For example, as shown in Figure 7, the relative positional relationship between the orthographic projection of the first light-transmitting protection structure 221 on the substrate 01 and the orthographic projection of the first light-emitting unit 101 on the substrate 01 is the same as the relative positional relationship between the orthographic projection of the second light-transmitting protection structure 222 on the substrate 01 and the orthographic projection of the second light-emitting unit 102 on the substrate 01.

[0107] In some examples, as shown in Figures 7 and 8, the second region 012 can be an area located at the edge of the substrate 01. A straight line passing through the luminous center of the first light-emitting unit 101 and perpendicular to the substrate 01 passes through the second position 202 of the first light-transmitting protective structure 221. The orthographic projection of the second light-emitting unit 102 on the substrate 01 has a second shape. The shortest distance between the second position 202 and the straight line passing through the luminous center of the second light-emitting unit 102 and perpendicular to the substrate 01 is greater than 0 and less than or equal to half the size of the second shape, which is conducive to improving light utilization. For example, when the second shape is a polygon, the size of the second shape is the length of the diagonal of the polygon or the length of any side of the polygon; when the second shape is a circle, the size of the second shape is the diameter of the circle; when the second shape is an ellipse, the size of the second shape is the major axis or minor axis of the ellipse.

[0108] For example, as shown in Figures 7 and 8, the straight line L0 passing through the light-emitting center of the second light-emitting unit 102 and perpendicular to the substrate 01 is located on the second position 202 of the second light-transmitting protective structure 222 close to the side of the first area 011, which can deflect the light emitted by the light-emitting unit located at the edge toward the middle, thereby improving the light utilization rate of the light-emitting unit located in the edge area of ​​the optical structure.

[0109] For example, as shown in FIG7 , the relative positional relationships between the second light-emitting units 102 at different locations and the second positions 202 in the corresponding second light-transmitting protective structure 221 can be different. For example, the second region 012 can include two regions located on either side of the first region 011 in the second direction, and the second positions 202 of the second light-transmitting protective structure 221 located in these two regions are closer to the first region 011 than the corresponding straight line L0. For example, the second region 012 includes a corner region and a side length region. The corner region can be regions near the four corners of the substrate 01, and the side length region can include regions near straight edges extending in the Y direction and regions near straight edges extending in the Z direction of the substrate 01. The relative positional relationship between the second light-emitting units 102 located in the corner regions and the second positions 202 in the corresponding second light-transmitting protective structure 221 is different from the relative positional relationship between the second light-emitting units 102 located in the side length regions and the second positions 202 in the corresponding second light-transmitting protective structure 221. For example, the direction indicated by the arrow in the Y direction is to the left, and the direction indicated by the arrow in the Z direction is to the upward direction. Taking the upper left corner area as an example, the center of the second light-emitting unit 102 located in the upper left corner area is offset to the right and downward by a certain distance relative to the second position 202 of the second light-transmitting protection structure 222; the center of the second light-emitting unit 102 located in the left side length area is only offset to the right by a certain distance relative to the second position of the second light-transmitting protection structure 222.

[0110] In some examples, as shown in FIG2 , the light-emitting structure further includes a reflective layer 400 located on a side of the substrate 01 where the light-emitting unit 100 is disposed. The reflective layer 400 includes a plurality of openings 410 . The plurality of openings 410 are disposed in a one-to-one correspondence with the plurality of light-emitting units 100 . At least one opening 410 has a size D0 , where D0 and D satisfy the relationship: 1.2 ≤ D0 / D ≤ 1.5 . For example, D0 and D satisfy the relationship: 1.32 ≤ D0 / D ≤ 1.4 . For example, D0 and D satisfy the relationship: 1.38 ≤ D0 / D ≤ 1.45 . For example, D0 and D satisfy the relationship: 1.25 ≤ D0 / D ≤ 1.35 . For example, each of the plurality of openings 410 has a size D0 .

[0111] For example, as shown in FIG2 , the orthographic projection of the light-emitting unit 100 on the substrate 01 does not overlap with the orthographic projection of the reflective layer 400 on the substrate 01. For example, the orthographic projection of the light-transmitting protective structure 200 on the substrate 01 does not overlap with the orthographic projection of the reflective layer 400 on the substrate 01. For example, the light-transmitting protective structure 200 is located within the opening 410 of the reflective layer 400.

[0112] For example, as shown in FIG2 , the reflective layer 400 may include a reflective sheet. FIG2 schematically illustrates the reflective layer 400 as a reflective sheet. The multiple openings 410 included in the reflective layer 400 are all openings in the reflective sheet, and the opening size of the reflective sheet is larger than the maximum size of the light-transmitting protective structure. However, the reflective layer may also include a white ink layer (not shown), with the light-transmitting protective structure overlapping the white ink layer, and the openings included in the white ink layer are used to expose the solder pads.

[0113] In some examples, as shown in FIG2 , the material of the light-transmitting protective structure 200 includes organic silicone, and the refractive index of the light-transmitting protective structure 200 is 1.3 to 1.7, and the transmittance is greater than 80%. For example, the refractive index of the light-transmitting protective structure 200 is 1.47 to 1.53. For example, the transmittance of the light-transmitting protective structure 200 is greater than 90%.

[0114] FIG9 is a schematic diagram of a partial structure of a light-emitting structure provided in accordance with another example of an embodiment of the present disclosure. The light-emitting structure shown in FIG9 differs from the light-emitting structure shown in FIG2 in that the light-transmitting protective structure 200 comprises a different material. The structure of the light-emitting structure shown in FIG9 , except for the light-transmitting protective structure and the light-emitting unit, may have the same features as the structure of the light-emitting structure shown in FIG2 , except for the light-transmitting protective structure and the light-emitting unit, and will not be repeated here. The position and size relationship between the light-transmitting protective structure and the light-emitting unit shown in FIG9 may have the same features as the position and size relationship between the light-transmitting protective structure and the light-emitting unit shown in FIG2 , and will not be repeated here.

[0115] 9 , the light emitting unit 100 has a light emission wavelength of 430-480 nanometers, and the light-transmitting protective structure 200 includes an inorganic light emitting material 250. For example, the light emitting unit 100 includes a blue light emitting chip to emit blue light.

[0116] For example, the inorganic luminescent material 250 may be uniformly dispersed in the light-transmitting protection structure 200 , or gathered on the light-emitting side of the light-transmitting protection structure 200 .

[0117] For example, as shown in FIG9 , the inorganic luminescent material 250 is composed of a fluorescent material. The fluorescent material can be inorganic particles, organic particles, or organic molecules, or a combination thereof. Suitable inorganic particles include doped garnets (such as YAG:Ce and (Y,Gd)AG:Ce), aluminates (such as Sr2Al14O25:Eu and BAM:Eu), silicates (such as SrBaSiO:Eu), sulfides (such as ZnS:Ag, CaS:Eu and SrGa2S4:Eu), oxysulfides, oxynitrides, phosphates, borates, and tungstates (such as CaWO4). These materials can be in the form of conventional inorganic luminescent material powders or nanoparticle inorganic luminescent material powders. Another class of suitable inorganic particles is so-called quantum dot inorganic luminescent materials, which are made of semiconductor nanoparticles, including: Si, Ge, CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, PbS, PbSe, PbTe, InN, InP, InAs, AlN, AlP, AlAs, GaN, GaP, GaAs and combinations thereof. Generally speaking, the surface of each quantum dot is at least partially covered by organic molecules to prevent agglomeration and improve compatibility with adhesives. In some cases, semiconductor quantum dots can be composed of several layers of different materials in a core-shell structure. Suitable organic molecules include fluorescent dyes. The phosphor layer can be composed of a mixture of different types of inorganic luminescent materials in a single layer or multiple layers, each layer containing one or more inorganic luminescent materials. The inorganic luminescent material particles in the phosphor layer can have different particle sizes (e.g., diameters) and can be separated.

[0118] The embodiments of the present disclosure are not limited thereto, and the light-emitting unit may further include a red light-emitting chip and a green light-emitting chip, in which case the inorganic light-emitting material may not be provided in the light-transmitting protective structure.

[0119] There are many processes for forming the light-transmitting protective structure provided by the embodiments of the present disclosure, such as any one of photolithography, printing, spray printing, pad printing, embossing, molding, coating, etc.

[0120] For example, the process of forming the light-transmitting protection structure 200 shown in FIG. 2 may specifically include the following steps:

[0121] Step S1: using a dispensing device to form a light-transmitting protective structural layer.

[0122] For example, the dispensing equipment includes at least one nozzle. For example, the nozzle diameter can be 0.1 to 0.3 mm. For example, when the temperature of the equipment forming the light-transmitting protective structure layer is 80°C, the nozzle movement speed is 8 mm / s, and the dispensing trajectory is set in a three-point circular pattern. Three circles are drawn in total to form the light-transmitting protective structure layer, such as a concave protective adhesive. For example, the diameters of the three circles can be the same, such as 2 to 3 mm, or 2.55 mm.

[0123] Step S2: After the dispensing is completed, the light-transmitting protective structure layer is allowed to stand in an environment of, for example, 10°C to 30°C for 1 hour, then allowed to stand at an equipment temperature of 60°C for 1 hour, and finally enters a heating furnace at 170°C to cure the protective glue to form a light-transmitting protective structure 200 with a recessed portion.

[0124] For example, a CCD camera can be used to capture a backlight image of a backlight source including a light emitting structure, and the captured image can be calculated. For example, a CCD camera captures the brightness of two adjacent light emitting units, and the brightness values ​​of the two light emitting units are calculated to be L max and L min , the brightness difference between the two light-emitting units is L max The ratio of (L max -L min ) / L max <2%, the human eye cannot distinguish the obvious brightness difference of the backlight source. max The ratio of (L max -L min ) / L max If the brightness difference between the two light-emitting units is 5% to 6%, the human eye can see obvious light shadows. max The ratio of (L max -L min ) / L max If it is greater than 6%, the lamp shadow is serious.

[0125] Figure 10 is a schematic diagram of a partial cross-sectional structure of a backlight source provided according to another embodiment of the present disclosure. As shown in Figure 10 , the backlight source includes a light emitting structure 1000 in any of the above examples.

[0126] For example, as shown in FIG10 , the backlight further includes a light diffusion structure 1001 located on the light-emitting side of the light-emitting structure 1000. For example, the light diffusion structure 1001 may include at least one light diffusion layer. For example, the light diffusion structure 1001 may include a first light diffusion layer and a second light diffusion layer. One of the first light diffusion layer and the second light diffusion layer may be a particle diffuser plate, and the other of the first light diffusion layer and the second light diffusion layer may be a diffusion film with a microstructure on its surface.

[0127] For example, the backlight source may further include layers such as a diffusion layer, a brightness enhancement film, and a color conversion layer (not shown), with the diffusion layer, brightness enhancement film, and color conversion layer all located on the side of the light diffusion structure away from the light emitting structure. For example, the brightness enhancement film may be a prism layer that focuses light and increases the brightness of light emitted from a straight-angle view. For example, the color conversion layer may convert light from a light-emitting unit from one color to another. For example, when the light-emitting unit emits blue light, the color conversion layer may include a phosphor layer that converts the blue light into white light. For example, the phosphor layer may include quantum dots that convert the blue light into red and green light. For example, in addition to the phosphor layer, the color conversion layer may include a partially reflective layer. For example, the partially reflective layer (also referred to as a dichroic layer or dichroic filter layer) may reflect all red and green light and partially reflect blue light. When a color conversion layer is provided in the backlight source, the inorganic luminescent material 250 shown in FIG. 9 may not be provided in the light-transmitting protective structure. For example, when the inorganic luminescent material 250 shown in FIG. 9 is provided in the light-transmitting protective structure, the color conversion layer may not be provided in the backlight source.

[0128] FIG11 is a partial cross-sectional view of a display device according to another embodiment of the present disclosure. As shown in FIG11 , the display device includes the light emitting structure 1000 of any of the above examples. For example, as shown in FIG11 , the display device includes the backlight source shown in FIG10 .

[0129] For example, as shown in FIG11 , the display device further includes a display panel 2000 stacked with the light emitting structure 1000. For example, the display panel 2000 is located on the light-emitting side of the light emitting structure 1000, and the light emitting structure 1000 is configured to provide backlight to the display panel 2000. For example, the display panel 2000 is a liquid crystal display panel. The liquid crystal display panel may include an array substrate (not shown), an opposing substrate (not shown), and a liquid crystal layer (not shown) located between the array substrate and the opposing substrate.

[0130] For example, a side of the array substrate facing the opposing substrate may include a plurality of gate lines extending in one direction and a plurality of data lines extending in another direction. The plurality of gate lines and the plurality of data lines are intersectingly arranged to define a plurality of pixel units arranged in an array. The plurality of pixel units may be arranged into a pixel array. Each pixel unit may include a pixel electrode and a thin film transistor. The gate line is connected to the gate electrode of the thin film transistor to control the on or off state of the thin film transistor. The pixel electrode is connected to one of the source and drain electrodes of the thin film transistor. The data line is connected to the other of the source and drain electrodes of the thin film transistor. The data line inputs a voltage signal required for displaying an image to the pixel electrode through the thin film transistor to realize display on the array substrate.

[0131] For example, the opposing substrate may be a color filter substrate. The side of the color filter substrate facing the array substrate may be provided with a color filter layer corresponding to the pixel units and a black matrix covering structures located in the non-display area, such as gate and data lines. For example, the side of the color filter substrate facing the array substrate may also be provided with a common electrode disposed opposite the pixel electrodes. The common electrode is configured to apply a common voltage to generate an electric field with the pixel electrodes that drives the liquid crystal molecules in the liquid crystal layer to deflect. The liquid crystal molecules undergo deflection, thereby changing the transmittance of the liquid crystal layer, thereby displaying a desired grayscale image. For example, both the common electrode and the pixel electrodes may be located on the array substrate.

[0132] There are a few points to note:

[0133] (1) The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures can refer to general designs.

[0134] (2) In the absence of conflict, features in the same embodiment and different embodiments of the present disclosure may be combined with each other.

[0135] The foregoing description is merely an exemplary embodiment of the present disclosure and is not intended to limit the scope of protection of the present disclosure. The scope of protection of the present disclosure is determined by the appended claims.

Claims

1. A light-emitting structure, comprising: substrate; A plurality of light-emitting units are located on the substrate; at least one light-transmitting protective structure, configured to wrap at least one light-emitting unit, Wherein, each light-transmitting protective structure wraps a light-emitting unit, the outer surface of the light-transmitting protective structure includes a first portion and a second portion surrounding the first portion, the boundary position between the first portion and the second portion includes a first position in the light-transmitting protective structure that is farthest from the substrate, the first portion includes a recessed portion bent toward a side close to the light-emitting unit, and the recessed portion includes a second position in the first portion that is closest to the substrate, the thickness of the light-transmitting protective structure at the first position is H, the maximum thickness of the light-emitting unit in a first direction perpendicular to the substrate is h, and H and h satisfy the relationship: 1 <H / h<17。 2. The light emitting structure according to claim 1, wherein: In a second direction parallel to the substrate, the distance between the first position and the second position is W, the size of the light-emitting unit in the second direction is L, the maximum size of the light-transmitting protection structure in the second direction is D, and W, L and D satisfy the relationship: L / 2 <W<D / 2。 3. The light emitting structure according to claim 1 or 2, wherein: The orthographic projection of the second position on the substrate is located within the orthographic projection of the light emitting unit on the substrate.

4. The light emitting structure according to claim 3, wherein: The orthographic projection of the light emitting unit on the substrate has a first shape, and the shortest distance between the second position and a straight line passing through the light emitting center of the light emitting unit and perpendicular to the substrate is greater than or equal to 0 and less than or equal to half the size of the first shape.

5. The light emitting structure according to any one of claims 1 to 4, wherein: The difference between H and the thickness of the light-transmitting protection structure at the second position is Hm, and Hm / H<0.

5.

6. The light emitting structure according to claim 2, wherein: The dimension of the portion of the light-transmitting protection structure with a thickness of H / 2 along the second direction is D', and D' and L satisfy the relationship: 3.5≤D' / L≤12.

5.

7. The light emitting structure according to claim 2, wherein: D and L satisfy the relationship: 3≤D / L≤13.

5.

8. The light emitting structure according to any one of claims 1 to 7, wherein: The light-emitting unit includes a light-emitting diode chip, and the outer surface of the light-transmitting protection structure covering the light-emitting unit includes a free-form surface.

9. The light emitting structure according to claim 8, wherein: The outer surface of the light-transmitting protection structure between the second position and the first position includes at least one curved surface and / or at least one flat surface.

10. The light emitting structure according to any one of claims 1 to 3, wherein: The at least one light-transmitting protective structure comprises a plurality of light-transmitting protective structures, and each light-emitting unit in at least part of the plurality of light-emitting units is wrapped by a light-transmitting protective structure; The substrate includes a first area and a second area located on at least one side of the first area, the at least part of the light-emitting units include a first light-emitting unit located in the first area and a second light-emitting unit located in the second area, the multiple light-transmitting protection structures include a first light-transmitting protection structure wrapping the first light-emitting unit and a second light-transmitting protection structure wrapping the second light-emitting unit, a straight line passing through the light-emitting center of the first light-emitting unit and perpendicular to the substrate passes through the second position of the first light-transmitting protection structure, the orthographic projection of the second light-emitting unit on the substrate has a second shape, and the shortest distance between the second position and the straight line passing through the light-emitting center of the second light-emitting unit and perpendicular to the substrate is greater than 0 and is less than or equal to half of the size of the second shape.

11. The light emitting structure according to claim 2, 6 or 7, wherein: The shape of the orthographic projection of at least one light-emitting unit on the substrate comprises a rectangle, and two adjacent sides of the rectangle extend along the second direction and the third direction respectively; The light-transmitting protection structure includes a second position and multiple first positions, the multiple first positions surround the one second position, the ratio of the distance between the second position and the first position in the second direction to the distance between the second position and the first position in the third direction is 0.8 to 1.2, and the ratio of the distances between different first positions and the substrate is 0.8 to 1.

2.

12. The light emitting structure according to claim 11, wherein: The distances between the plurality of first positions and the substrate are all the same.

13. The light emitting structure according to claim 11, wherein: The plurality of first positions are connected along a clockwise line to form a circle or an ellipse.

14. The light emitting structure according to claim 5, wherein: Hm meets: 0mm <Hm≤1.2mm。 15. The light emitting structure according to any one of claims 1 to 14, wherein: H satisfies: 0.5mm≤H≤2mm.

16. The light emitting structure according to claim 2, 6 or 7, wherein: D satisfies: 4mm≤D≤10mm.

17. The light emitting structure according to claim 2, 6 or 7, further comprising: a reflective layer, located on a side of the substrate where the light-emitting unit is disposed, The reflective layer includes a plurality of openings, the plurality of openings are arranged in one-to-one correspondence with the plurality of light-emitting units, and a size of at least one opening is D0, and D0 and D satisfy the relationship: 1.2≤D0 / D≤1.

5.

18. The light emitting structure according to any one of claims 1 to 17, wherein: The material of the light-transmitting protective structure includes organic silica gel, the refractive index of the light-transmitting protective structure is 1.3-1.7, and the transmittance is greater than 80%.

19. The light emitting structure according to claim 18, wherein: The light emitting unit has a light emission wavelength of 430-480 nanometers, and the light-transmitting protective structure includes an inorganic light-emitting material.

20. A backlight source, comprising the light-emitting structure according to any one of claims 1 to 19.

21. A display device comprising the light emitting structure according to any one of claims 1 to 19.

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