Light-emitting structure, backlight source and display device

Abstract

The invention discloses a light-emitting structure, a backlight source and a display device. The light-emitting structure comprises a substrate, and a light-emitting unit and a light-transmitting protection structure which are located on the substrate, wherein the light-transmitting protection structure is configured to wrap the light-emitting unit. The outer surface of the light-transmitting protection structure comprises a first part and a second part surrounding the first part, the boundary position of the first part and the second part comprises a first position farthest from the substrate in the light-transmitting protection structure, and the first part comprises a concave part bent towards one side close to the light-emitting unit; the concave part comprises a second position closest to the substrate in the first part, the thickness of the light-transmitting protection structure at the first position is H, the maximum thickness of the light-emitting unit in the first direction perpendicular to the substrate is h, and H and h meet the relation: 1lt; h / hlt; 17). The shape of the light-transmitting protection structure is set to comprise the concave part, and meanwhile, the relationship between the maximum thickness of the light-transmitting protection structure and the maximum thickness of the light-emitting unit is set, so that the brightness over the light-emitting unit is reduced, and uniform picture display is achieved.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a light-emitting structure, a backlight source, and a display device. Background Art

[0002] Compared with traditional LED backlight, direct-type sub-millimeter light-emitting diode (Mini LED) backlight can realize more partitions, thus achieving high-definition, high-brightness and refined picture display. As a result, sub-millimeter light-emitting diode (Mini LED) is increasingly developing in the display field, especially in the field of television (TV), and is favored by more and more consumers. Summary of the invention

[0003] 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 of 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 of 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, and H and h satisfy the relationship: 1 <H / h<17。

[0004] 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 protection structure in the second direction is D, and W, L and D satisfy the relationship: L / 2 <W<D / 2。

[0005] 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.

[0006] 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.

[0007] For example, according to an embodiment of the present disclosure, the difference between H and the thickness of the light-transmitting protection structure at the second position is Hm, and Hm / H<0.5.

[0008] 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.

[0009] For example, according to an embodiment of the present disclosure, D and L satisfy the relationship: 3≤D / L≤13.5.

[0010] 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.

[0011] 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.

[0012] For example, according to an embodiment of the present disclosure, the at least one light-transmitting protection structure includes a plurality of light-transmitting protection structures, and each of at least some of the plurality of light-emitting units is wrapped by a light-transmitting protection 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, and the plurality of 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, and 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 the size of the second shape.

[0013] 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, and 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.

[0014] 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.

[0015] 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.

[0016] For example, according to the embodiment of the present disclosure, Hm satisfies: 0 mm <Hm≤1.2mm。

[0017] For example, according to an embodiment of the present disclosure, H satisfies: 0.5 mm ≤ H ≤ 2 mm.

[0018] For example, according to an embodiment of the present disclosure, D satisfies: 7 mm ≤ D ≤ 10 mm.

[0019] 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 unit is disposed. The reflective layer includes a plurality of openings, the plurality of openings are disposed one-to-one 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.

[0020] For example, according to an embodiment of the present disclosure, the material of the light-transmitting protection structure includes organic silica gel, the refractive index of the light-transmitting protection structure is 1.3-1.7, and the transmittance is greater than 80%.

[0021] 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.

[0022] Another embodiment of the present disclosure provides a backlight source, comprising any of the above-mentioned light-emitting structures.

[0023] Another embodiment of the present disclosure provides a display device, comprising any of the above-mentioned light-emitting structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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, but are not intended to limit the present disclosure.

[0025] Figure 1 It is a schematic diagram of a partial cross-sectional structure of a light-emitting structure.

[0026] Figure 2 It is a schematic diagram of a partial cross-sectional structure of a light-emitting structure provided according to an embodiment of the present disclosure.

[0027] Figure 3 for Figure 2 A plan view of a light-emitting unit in the light-emitting structure and a light-transmitting protective structure wrapping the light-emitting unit.

[0028] Figure 4 It is the light intensity distribution diagram of the light-emitting unit in different settings.

[0029] Figure 5Schematic diagram of the structure of the light-transmitting protection structure at the second position at different thicknesses.

[0030] Figure 6 For Figure 5 The light type curves of the light emitted by the light-transmitting protection structures with different thicknesses are shown.

[0031] Figure 7 A planar structure of a light emitting structure provided according to another example of an embodiment of the present disclosure.

[0032] Figure 8 For along Figure 7 The schematic diagram of the local cross-section structure taken along line AA' is shown.

[0033] Fig. 9 A schematic diagram of a partial structure of a light-emitting structure provided according to another example of an embodiment of the present disclosure.

[0034] Fig.10 It is a schematic diagram of a partial cross-sectional structure of a backlight source provided according to another embodiment of the present disclosure.

[0035] Fig.11 It is a schematic diagram of a partial cross-sectional structure of a display device provided according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than 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.

[0037] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "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. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The features such as "parallel", "vertical" and "same" used in the embodiments of the present disclosure include the features such as "parallel", "vertical", "same" in the strict sense, and "approximately parallel", "approximately vertical", "approximately the same" and other situations containing certain errors, taking into account the measurement and the errors related to the measurement of a specific amount (for example, the limitations of the measurement system), indicating the acceptable deviation range for a specific value determined by ordinary technicians in the field. For example, "approximately" can be expressed within one or more standard deviations, or within 10% or 5% of the value. When the number of a component is not particularly indicated in the following of the embodiments of the present disclosure, it means that the component can be one or more, or can be understood as at least one. "At least one" refers to one or more, and "multiple" refers to at least two.

[0038] A direct-type backlight source is provided with multiple light-emitting diodes (LEDs), such as multiple mini LEDs, which mix the light emitted by adjacent LEDs to achieve uniform display of the entire image. The display effect of a display device including a direct-type backlight source is not only related to the optical mixing distance (OD: Optical distance) in the backlight source and the arrangement distance (Pitch) of adjacent LEDs, but also closely related to the light pattern of the LED.

[0039] Figure 1 FIG. 1 is a schematic diagram of a partial cross-sectional structure of a light-emitting structure. Figure 1 As shown, in the manufacturing process of the backlight source using Mini LED, Mini LED 12 is soldered on the substrate 11 by die bonding, such as Mini LED 12 includes soldering metal 14, such as pins, which are connected to pads 15 on the substrate 11. In order to prevent the Mini LED chip from being exposed to the air and damaged by dirt, etc., a convex or roughly dome-shaped silicone 13 is usually provided on the surface of each Mini LED. Since the silicone has a certain refractive index, such as a refractive index of 1.5, which is greater than the refractive index of air, the light emitted by the Mini LED is refracted when it passes through the silicone to the air or other media, so that the secondary light type of the light emitted by the LED changes when it is emitted from the silicone.

[0040] During the research, the inventor of the present application found that in the design of TV backlight, in order to control the cost at a certain optical mixing distance (OD: Optical distance), by increasing the arrangement distance (Pitch) of adjacent LEDs. At a certain pitch, by reducing the OD, the thickness of the backlight module can be reduced. Under some combinations of OD and Pitch, the LED lights will be bright and the LED lights will be dark, resulting in bright and dark stripes on the entire backlight screen, and the problem of not being able to achieve a uniform picture display. Through the secondary light type analysis of the LED, it can be seen that the light intensity of the LED at the middle angle is not small enough.

[0041] 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, and 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, and H and h satisfy the relationship: 1 <H / h<17。

[0042] The light-emitting structure provided by the present disclosure, by setting the shape of the light-transmitting protective structure wrapping 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, so as to reduce the brightness difference above the light-emitting unit and between adjacent light-emitting units, and realizing uniform picture display.

[0043] The light emitting structure, backlight source and display device provided by the embodiments of the present disclosure are described below in conjunction with the accompanying drawings.

[0044] Figure 2 It is a schematic diagram of a partial cross-sectional structure of a light-emitting structure provided according to an embodiment of the present disclosure. Figure 3 for Figure 2 A plan view of a light-emitting unit in the light-emitting structure and a light-transmitting protective structure encapsulating the light-emitting unit. Figure 2 As shown, the light emitting structure includes a substrate 01 and a plurality of light emitting units 100 and at least one light-transmitting protective structure 200 located on the substrate 01 . The at least one light-transmitting protective structure 200 is configured to wrap at least one light emitting unit 100 . Figure 2Two light emitting units 100 arranged along the Y direction are schematically shown, but the present invention is not limited thereto. The light emitting structure may include more light emitting units arranged along the Y direction.

[0045] For example, Figure 2 As shown, the substrate 01 may be a printed circuit board (PCB) or glass, plastic, polyimide, polymethyl methacrylate, etc. with circuits.

[0046] For example, Figure 2 As shown, a buffer layer (Buffer) 02 is provided on the substrate 01. For example, a pad 310 is provided on the side of the buffer layer 02 away from the substrate 01, and the light-emitting unit 100 includes a pin 110 and a light-emitting body 120, and the pin 110 of the light-emitting unit 100 is electrically connected to the pad 310. For example, a passivation layer (Passivation layer, PVX) 03 is also provided on the 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 exposing 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.

[0047] like Figure 2 As shown, 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 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 .

[0048] like Figure 2As shown, the outer surface of the light-transmitting protective structure 200 includes a first portion 210 and a second portion 220 surrounding the first portion 210. For example, the first portion 210 and the second portion 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 portion 210 on the substrate 01. For example, the shape of the orthographic projection of the first portion 210 on the substrate 01 can be circular or elliptical, and the shape of the orthographic projection of the second portion 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 portion 220 on the substrate 01 can be a shape with a uniform ring width, but is not limited thereto. According to product requirements, the ring width of the annular orthographic projection of the second portion on the substrate can also be set to be larger at some positions and smaller at some positions.

[0049] like Figure 2 and Figure 3 As shown, the boundary position between the first part 210 and the second part 220 includes the first position 201 in the light-transmitting protection structure 200 that is farthest from the substrate 01. For example, the boundary position between the first part 210 and the second part 220 can be a circle of first positions 201. For example, the first position 201 is the position in the first part 201 that is farthest from the substrate 01, and the first position 201 is also the position in the second part 220 that is farthest from the substrate 01. For example, the position in the second part 220 that is closest to the substrate 01 is the edge position of the light-transmitting protection structure 200. For example, the light-transmitting protection structure 200 includes a circle of protruding structures, and the circle of protruding structures includes a circle of highest points, such as a circle of highest points including multiple first positions 201.

[0050] In some examples, such as Figure 2 and Figure 3 As shown, the light-transmitting protection structure 200 includes a second position 202 and a plurality of first positions 201 surrounding the second position 202, and the ratio of the distances between different first positions 201 and the substrate 01 is 0.8 to 1.2. For example, different first positions 201 may be different points, and all first positions 201 are connected clockwise to form 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.

[0051] In some examples, such as Figure 2 and Figure 3 As shown, the distances between different first positions 201 and the substrate 01 are the same, which can facilitate the manufacture of the light-transmitting protection structure and help the light-transmitting protection structure to perform substantially 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.

[0052] In some examples, such as Figure 2 and Figure 3As shown, a plurality of first positions 201 are connected in a clockwise direction to form a circle or an ellipse.

[0053] As Figure 2 shown, the first part 210 includes a recessed part 211 that bends towards the side close to the light-emitting unit 100. The recessed part 211 includes a second position 202 that is the closest to the substrate 01 among the first parts 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 can refer to the distance between the first position 201 and the surface of the light-transmitting protection structure 200 closest to the substrate 01, such as Figure 2 the surface of the light-transmitting protection structure 200 in contact with the passivation layer 03 as shown. 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.

[0054] 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 part 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, so as to reduce the brightness difference between above the light-emitting unit and adjacent light-emitting units, and achieve a uniform picture display.

[0055] Figure 2 Schematically shown that on the side of each light-emitting unit 100 away from the substrate 01, there is a light-transmitting protection structure 200 including a recessed part, but not limited to this. There may also be a light-transmitting protection structure on the side of at least one light-emitting unit (such as the light-emitting units in a certain area of the light-emitting structure) away from the substrate that does not include a recessed part. For example, the shape of this light-transmitting protection structure can be Figure 1 the roughly dome shape of the silica gel 13 as shown. 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 part, 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 can 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 can be the central area including the geometric center of the substrate, and the first sub-area is the area surrounding the second sub-area.

[0056] Figure 4 is the light intensity distribution diagram of the light-emitting unit in different settings. Figure 4 As shown, the horizontal axis represents the luminous angle of the light-emitting unit, 0° represents the exact center of the light-emitting unit, and among the light rays emitted by the light-emitting unit, the luminous angle toward the negative pole of the two pins is negative, and the luminous angle toward the positive pole of the two pins is positive; the vertical axis represents the normalized luminous intensity of the light-emitting unit at the corresponding angle.

[0057] For example, Figure 4 As shown, LD1 indicates Figure 2 The light intensity distribution of the light-emitting unit in the light-emitting structure shown in the figure is not wrapped by the light-transmitting protective structure. LD2 represents Figure 2 The light-emitting unit in the light-emitting structure shown is provided with Figure 1 The light intensity distribution under the dome-shaped light-transmitting protective structure shown, LD3 represents Figure 2 The light-emitting unit in the light-emitting structure shown is Figure 2 The light intensity distribution wrapped by the light-transmitting protection structure 200 is shown.

[0058] For example, Figure 4 As shown, 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, such as the light intensity of the light emitting unit 100 at a 0-degree light emitting angle is lower than the light intensity at a 70-degree light emitting angle. For example, the light intensity distributions shown in LD1, LD2, and LD3 all have batwing light distribution characteristics. For example, the batwing light distribution characteristic is defined as taking the optical axis passing through the geometric center of the light emitting unit 100 as 0 degrees, and having a light intensity distribution with a light intensity stronger than 0 degrees within an angle where the absolute value of the light distribution angle is greater than 0 degrees.

[0059] For example, Figure 4 As shown, the light intensity of LD3 within ±70 degrees is less than the light intensity of LD1 and LD2 within the light-emitting angle range.

[0060] Compared with not setting a light-transmitting protective structure, or setting the shape of the light-transmitting protective structure wrapping the light-emitting unit to Figure 1 As shown in the dome shape, the optical structure provided by the present invention 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 to 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 uniformity of the optical structure to achieve uniform picture display.

[0061] For example, Figure 2As shown, 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.

[0062] For example, as Figure 2 As shown, 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.

[0063] For example, as Figure 2 As shown, the thickness h of the light-emitting unit 100 may be not 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.

[0064] In some examples, as Figure 2 As shown, wherein, 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.

[0065] In some examples, as Figure 2 As shown, 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.

[0066] For example, as Figure 2 As shown, 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.

[0067] In some examples, as Figure 2 As shown, Hm satisfies: 0 mm < Hm ≤ 1.2 mm. For example, 0.1 mm ≤ Hm ≤ 0.5 mm.

[0068] Figure 5 It is a schematic structural diagram of the light-transmitting protection structure at different thicknesses at the second position. Figure 6 It is from Figure 5 The light pattern curve of the light emitted from the light-transmitting protection structure with different thicknesses as shown.

[0069] For example, Figure 2 , Figure 5 and Figure 6 As shown, the light intensity of the light emitted at 0° by the light-emitting unit 100 (such as a bare core) without a light-transmitting protective structure 200 on the light-emitting side is greater than the light intensity of the light emitted at 0° by the structure with a light-transmitting protective structure 200 on the light-emitting side of the light-emitting unit 100. For example, relative 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 maximum position of the light intensity of the light emitted from the light-transmitting protective structure 200 can be expanded by at least 10 degrees to increase 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 maximum position of the 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 maximum light intensity position of the light emitted from the light-transmitting protective structure 200 can be expanded by at least 20 degrees.

[0070] For example, Figure 5 and Figure 6 As shown, the height difference Hm between the first position 201 and the second position 202 in the light-transmitting protection structure 200-1 is 0.1 mm, the height difference Hm between the first position 201 and the second position 202 in the light-transmitting protection structure 200-2 is 0.2 mm, the height difference Hm between the first position 201 and the second position 202 in the light-transmitting protection structure 200-3 is 0.3 mm, the height difference Hm between the first position 201 and the second position 202 in the light-transmitting protection structure 200-4 is 0.4 mm, and the height difference Hm between the first position 201 and the second position 202 in the light-transmitting protection structure 200-5 is 0.5 mm. For example, the light intensity of the light emitted from the light-transmitting protection structure 200-5 is the smallest at 0°.

[0071] In some examples, such as Figure 2 As shown, the outer surface of the light-transmitting protection structure 200 covering the light-emitting unit 100 includes a free-form surface.

[0072] In some examples, such as Figure 2 As shown, the outer surface of the light-transmitting protection structure 200 from the second position 202 to 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 protection structure 200 from the second position 202 to the first position 201 may be an annular curved surface. For example, the distance between the surface of the second position 202 and the first position 201 and the substrate 01 gradually increases.

[0073] For example, Figure 2 It is schematically shown that the section line of the surface between the first position 201 and the second position 202 cut by the XY plane is a curve bending toward the side away from the substrate 01, but is not limited to this. For example, the shape of the section line 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 bending toward the side close to the substrate, etc., which can be set according to actual light type requirements.

[0074] For example, Figure 2 It is schematically shown that there is a peak (first position 201) between the second position 202 and the edge of the light-transmitting protection structure 200, but it is not limited to this. There may also be two or more peaks between the second position and the edge of the light-transmitting protection 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 among the multiple peaks closest to the center of the light-transmitting protection structure is the peak where the first position is located.

[0075] For example, Figure 2 As shown, a straight line passing through the second position 202 and perpendicular to the substrate 01 is taken as the central axis of the light-transmitting protection structure 200 , and the cross sections of the light-transmitting protection structure 200 cut by the XY plane are symmetrically distributed relative to the central axis.

[0076] For example, Figure 2 As shown, the second position 202 may be a point on the surface of the light-transmitting protection structure 200, such as the lowest point of the recessed portion 211. However, the second position may also be a plane, such as a plane with a very small area, such as less than 10% of the area of ​​the light-emitting unit.

[0077] In some examples, such as Figure 2 and Figure 3 As shown, 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 envelops 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 beneficial to perform substantially symmetrical modulation on the light emitted from at least a portion of the light-transmitting protective structure.

[0078] In some examples, such as Figure 2 and Figure 3As shown, 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 the straight 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 of the size of the first shape. For example, the size of the first shape may be a size along the Y direction, or a size along the Z direction, and the size may be a size along the extension direction of the line connecting the second position and the straight 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.

[0079] For example, Figure 2 and Figure 3 As shown, 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 an 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.

[0080] 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.

[0081] In some examples, such as Figure 2 As shown, 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, the maximum size of the light-transmitting protection structure 200 in the second direction is D, and W, L and D satisfy the relationship: L / 2 <W<D / 2。

[0082] 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 protection structure in a direction parallel to the substrate, and the size of the light-transmitting protection structure 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 protection 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 protection 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.

[0083] For example, Figure 2 As shown, W, L and D satisfy the relationship: 0.4*L <W<0.45*D。

[0084] In some examples, such as Figure 2 As shown, D and L satisfy the relationship: 3≤D / L≤13.5. By setting the maximum value of D / L to no more than 8, the reflector can be made to have a larger area 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 improved as much as possible.

[0085] For example, Figure 2 As shown, 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.

[0086] In some examples, such as Figure 2 As shown, D satisfies: 4mm≤D≤10mm. For example, D satisfies: 5mm≤D≤9.5mm. For example, D satisfies: 6mm≤D≤13.5mm. For example, D satisfies: 5mm≤D≤7.5mm.

[0087] For example, Figure 2 As shown, D satisfies: 8 mm ≤ D ≤ 9.5 mm. For example, D satisfies: 7.5 mm ≤ D ≤ 9 mm.

[0088] In some examples, such as Figure 2 As shown, the transparent protection structure 200 has a thickness of H / 2 in the first direction, such as the X direction, and a dimension D' along the 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.

[0089] 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 protection structure in a direction parallel to the substrate, and the size relationship between the light-emitting unit and the light-transmitting protection structure at a position where the thickness is half in the direction parallel to the substrate, the light type of the light emitted from the light-emitting unit after passing through the light-transmitting protection structure can be adjusted, which is beneficial to reducing the light intensity within ±50 degrees of the light emitted from the light-emitting unit after passing through the light-transmitting protection 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 emission from the optical structure to achieve uniform picture display.

[0090] For example, Figure 2 As shown, 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.

[0091] In some examples, such as Figure 2 As shown, 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 (MiniLED) 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 are recombined in the light-emitting layer, and energy is released in the form of photons. The emission wavelength depends on the bandgap width of the light-emitting material.

[0092] For example, Figure 2 As shown, the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 is not greater than 3 mm. For example, the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 is not greater than 500 microns. For example, the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 is not greater than 300 microns. For example, the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 is not greater than 250 microns. For example, the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 is not greater than 220 microns. For example, the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 is not greater than 200 microns. For example, the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 is not greater than 150 microns.

[0093] For example, Figure 3 As shown, the outline shape of the orthographic projection of the light-emitting unit 100 on the substrate 01 may be a rectangle, and the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 may be the diagonal of the light-emitting unit 100. Of course, the embodiments of the present disclosure are not limited thereto. For example, the outline shape of the orthographic projection of the light-emitting unit on the substrate may be a circle, and the maximum dimension of the light-emitting unit in a direction parallel to the substrate may be the diameter of the light-emitting unit; for example, the outline shape of the orthographic projection of the light-emitting unit on the substrate may be an ellipse, and the maximum dimension of the light-emitting unit in a direction parallel to the substrate may be the long axis of the light-emitting unit. However, it is not limited thereto, and the side length of the planar shape of the light-emitting unit is also not greater than 3 mm.

[0094] In some examples, such as Figure 2 and Figure 3 As shown, the shape of the orthographic projection of at least one light emitting unit 100 on the substrate 01 includes a rectangle, and two adjacent sides of the rectangle extend respectively along the second direction, such as the Y direction, and the third direction, such as the Z direction. For example, the shape of the orthographic projection of the light emitting unit 100 on the substrate 01 may be a rectangle, 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.

[0095] In some examples, such as Figure 2 and Figure 3 As shown, 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 is conducive to the light-transmitting protection structure to perform substantially the same secondary light pattern change on the light emitted by the light-emitting unit in the above two directions.

[0096] For example, when the shape of the orthographic 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 difference in light pattern 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.

[0097] For example, Figure 2 and Figure 3 As shown, the difference between the thickness at the first position 201 located on one side of the second position 202 in the second direction and the thickness at the second position 202 is Hm1, the difference between the thickness at the first position 201 located on one side of the second position 202 in the third direction and the thickness at the second position 202 is Hm2, and 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 is the same as Hm2.

[0098] For example, Figure 2 and Figure 3 As shown, the shape of the orthographic projection of at least one light-transmitting protection structure 200 on the substrate 01 is circular. However, it is not limited thereto. For example, the shape of the orthographic projection of at least one light-transmitting protection structure on the substrate includes an ellipse. For example, the shape of the orthographic projection of the annular first position 201 on the substrate 01 is the same as the shape of the orthographic projection of the light-transmitting protection structure 200 on the substrate 01.

[0099] Figure 7 A planar structure of a light emitting structure provided according to another example of an embodiment of the present disclosure. Figure 8 For along Figure 7 The schematic diagram of the local cross-section structure taken along line AA' is shown.

[0100] In some examples, such as Figure 7 and Figure 8As shown, at least one transparent protective structure 200 includes a plurality of transparent protective structures 200, and each of at least some of the plurality of light-emitting units 100 is wrapped by a transparent protective structure 200. For example, each of all the light-emitting units 100 is wrapped by a transparent protective structure 200.

[0101] In some examples, such as Figure 7 As shown, the substrate 01 includes a first area 011 and a second area 012 located at least on one side of the first area 011. For example, the first area 011 may be an area including the geometric center of the substrate 01. For example, the shape of the first area 011 may be a regular shape such as a rectangle or a circle, or an irregular shape. For example, the second area 012 is an area of ​​the substrate 01 other than the first area 011. For example, the second area 012 surrounds the first area 011.

[0102] In some examples, such as Figure 7 As shown, 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 plurality of 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 .

[0103] For example, Figure 7 As shown, 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.

[0104] For example, Figure 7 As shown, 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.

[0105] In some examples, such as Figure 7 and Figure 8As shown, the second area 012 may 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, and the orthographic projection of the second light-emitting unit 102 on the substrate 01 has a second shape, and 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 is less than or equal to half of the size of the second shape, which is conducive to improving the utilization rate of light. 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.

[0106] For example, Figure 7 and Figure 8 As shown, 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 protection structure 222 close to 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.

[0107] For example, Figure 7 As shown, the relative positional relationship between the second light-emitting unit 102 at different positions and the second position 202 in the corresponding second light-transmitting protective structure 221 may be different. For example, the second area 012 may include two partial areas located on both sides of the first area 011 in the second direction, and the second position 202 of the second light-transmitting protective structure 221 located in these two partial areas are closer to the first area 011 than the corresponding straight line L0. For example, the second area 012 includes a corner area and a side length area, the corner area may be an area near the four corners of the substrate 01, the side length area may include an area near the straight edge extending along the Y direction and an area near the straight edge extending along the Z direction of the substrate 01, and the relative positional relationship between the second light-emitting unit 102 located in the corner area and the second position 202 in the corresponding second light-transmitting protective structure 221 is different from the relative positional relationship between the second light-emitting unit 102 located in the side length area and the second position 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.

[0108] In some examples, such as Figure 2As shown, the light-emitting structure further includes a reflective layer 400, which is located on the side of the substrate 01 where the light-emitting unit 100 is provided. The reflective layer 400 includes a plurality of openings 410, and the plurality of openings 410 are arranged one-to-one with the plurality of light-emitting units 100, and the size of at least one opening 410 is D0, and 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, the size of each opening of the plurality of openings 410 is D0.

[0109] For example, Figure 2 As shown, 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 protection 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 protection structure 200 is located in the opening 410 of the reflective layer 400.

[0110] For example, Figure 2 As shown, the reflective layer 400 may include a reflective sheet. Figure 2 The reflective layer 400 is schematically shown as a reflective sheet, and the multiple openings 410 included in the reflective layer 400 are all openings of the reflective sheet, and the opening size of the reflective sheet is larger than the maximum size of the light-transmitting protective structure. However, it is not limited to this, and the reflective layer may also include a white ink layer (not shown in the figure), the light-transmitting protective structure overlaps with the white ink layer, and the opening included in the white ink layer is used to expose the pad.

[0111] In some examples, such as Figure 2 As shown, the material of the light-transmitting protection structure 200 includes organic silica gel, the refractive index of the light-transmitting protection structure 200 is 1.3-1.7, and the transmittance is greater than 80%. For example, the refractive index of the light-transmitting protection structure 200 is 1.47-1.53. For example, the transmittance of the light-transmitting protection structure 200 is greater than 90%.

[0112] Fig. 9 A schematic diagram of a partial structure of a light-emitting structure provided according to another example of an embodiment of the present disclosure. Fig. 9 The light emitting structure shown is Figure 2 The light emitting structures shown are different in that the light-transmitting protection structure 200 comprises different materials. Fig. 9 The structures other than the light-transmitting protection structure and the light-emitting unit in the light-emitting structure shown can be Figure 2 The structures other than the light-transmitting protection structure and the light-emitting unit in the light-emitting structure shown have the same features, which will not be described in detail here. Fig. 9 The position and size relationship between the light-transmitting protection structure and the light-emitting unit can be Figure 2The position and size relationship of the light-transmitting protection structure shown have the same characteristics as those of the light-emitting unit, which will not be described in detail here.

[0113] In some examples, such as Fig. 9 As shown, the light emitting unit 100 has a light emission wavelength of 430-480 nanometers, and the light-transmitting protection 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.

[0114] 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 .

[0115] For example, Fig. 9 As shown, the inorganic luminescent material 250 is composed of a fluorescent material. The fluorescent material can be an inorganic particle, an organic particle, or an organic molecule 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, 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, and each layer contains 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.

[0116] 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 protection structure.

[0117] There may be a variety of 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.

[0118] For example, forming Figure 2 The process of the light-transmitting protection structure 200 may specifically include the following steps:

[0119] Step S1: using a dispensing device to form a light-transmitting protective structure layer.

[0120] For example, the dispensing device 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 device for forming the light-transmitting protective structure layer is 80°C, the nozzle movement speed is 8 mm / s, and the dispensing track is set in a 3-point circle drawing manner, and a total of 3 circles are drawn to point out the light-transmitting protective structure layer, such as the shape of a concave protective glue. For example, the diameters of the 3 circles can be the same, such as 2 to 3 mm, such as 2.55 mm.

[0121] Step S2: After the glue 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.

[0122] For example, a CCD camera may be used to capture a backlight image of a backlight source including a light emitting structure, and the captured image may 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 and L respectively. max and L min , the brightness difference between the two light-emitting units is related to 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.

[0123] Fig.10 FIG. 1 is a schematic diagram of a partial cross-sectional structure of a backlight source provided according to another embodiment of the present disclosure. Fig.10 As shown, the backlight source includes the light emitting structure 1000 in any of the above examples.

[0124] For example, Fig.10As shown, the backlight source further includes a light diffusion structure 1001 located at 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 diffusion 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 the surface.

[0125] For example, the backlight source may further include film layers such as a diffusion layer, a brightness enhancement film, and a color conversion layer (not shown), and the diffusion layer, the brightness enhancement film, and the color conversion layer are 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, which plays a role in focusing light and improving 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 color. 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 includes quantum dots that convert blue light into red and green light. For example, in addition to the phosphor layer, the color conversion layer may include a partial reflective layer. For example, the partial reflective layer (also referred to as a dichroic layer or a 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 light-transmitting protection structure may not be provided. Fig. 9 The inorganic luminescent material 250 shown. For example, when the light-transmitting protective structure is provided Fig. 9 When the inorganic luminescent material 250 is shown, a color conversion layer may not be provided in the backlight source.

[0126] Fig.11 FIG. 1 is a schematic diagram of a partial cross-sectional structure of a display device provided according to another embodiment of the present disclosure. Fig.11 As shown, the display device includes the light emitting structure 1000 in any of the above examples. Fig.11 As shown, the display device includes Fig.10 Backlight shown.

[0127] For example, Fig.11 As shown, the display device further includes a display panel 2000 stacked with the light emitting structure 1000. For example, the display panel 2000 is located at 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.

[0128] For example, the side of the array substrate facing the opposite 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 cross-arranged to define a plurality of pixel units arranged in an array, and 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 of the thin film transistor to control the opening or closing 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, and the data line inputs a voltage signal required for displaying the picture to the pixel electrode through the thin film transistor to realize the display of the array substrate.

[0129] For example, the opposing substrate may be a color filter substrate, and a color filter layer corresponding to the pixel unit and a black matrix covering structures such as gate lines and data lines located in a non-display area may be provided on the side of the color filter substrate facing the array substrate. For example, a common electrode arranged opposite to the pixel electrode may also be provided on the side of the color filter substrate facing the array substrate, and the common electrode is configured to apply a common voltage to generate an electric field with the pixel electrode to drive the liquid crystal molecules in the liquid crystal layer to deflect. The liquid crystal molecules change the transmittance of the liquid crystal layer by deflection, thereby realizing the display of a desired grayscale image. For example, the common electrode and the pixel electrode may both be located on the array substrate.

[0130] There are a few points to note:

[0131] (1) In the drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are involved, and other structures can refer to the general design.

[0132] (2) In the absence of conflict, features in the same embodiment or in different embodiments of the present disclosure may be combined with each other.

[0133] The above description is merely an exemplary embodiment of the present disclosure and is not intended to limit the protection scope of the present disclosure. The protection scope 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, 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 4, 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, 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 4, wherein: H satisfies: 0.5mm≤H≤2mm.

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

17. The light emitting structure according to claim 2, 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 4, 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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