Light-emitting substrate, backlight source and display device

Abstract

The invention discloses a light-emitting substrate, a backlight source and a display device. The light-emitting substrate comprises a substrate (01), a plurality of light-emitting units (100) and a light-transmitting protection structure (20), wherein the light-emitting units (100) and the light-transmitting protection structure (20) are located on the substrate. The substrate (01) comprises a plurality of dimming subareas (10); the light-transmitting protection structure (20) wraps the plurality of light-emitting units (100) except for the portions in contact with the substrate. The light-transmitting protection structure (20) comprises a plurality of dimming subareas (10), each dimming subarea comprises at least one light-emitting unit (100), the light-transmitting protection structure (20) comprises a plurality of sub-protection structure groups (200) which are arranged in one-to-one correspondence with the plurality of dimming subareas (10), each sub-protection structure group (200) wraps the light-emitting unit (100) in one dimming subarea (10), and adjacent sub-protection structure groups (200) corresponding to at least two adjacent dimming subareas (10) are integrally arranged. A sub-protection structure group (200) is correspondingly arranged in each dimming subarea (10), and the adjacent sub-protection structure groups (200) corresponding to at least two adjacent dimming subareas (10) are integrally arranged, so that the pitch of the light emitting unit (100) is not limited by the size of the light-transmitting protection structure (20); modulation of emergent light rays of each dimming subarea (10) in all directions and optimization control of the overall light pattern are achieved, and the light uniformizing effect is improved.

Description

Light-emitting substrate, backlight source, and display device Technical Field

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

[0002] In backlight products that use sub-millimeter light-emitting diodes (Mini LEDs) as light-emitting elements, an optical structure can be set on the light-emitting side of the light-emitting element to optimize the light-emitting light pattern of the light-emitting element.

[0003] Summary of the Invention

[0004] The present disclosure provides a light-emitting substrate, a backlight source, and a display device.

[0005] The present disclosure provides a light-emitting substrate, comprising a substrate, a plurality of light-emitting units located on the substrate, and a light-transmitting protective structure. The substrate comprises a plurality of dimming sub-zones; the light-transmitting protective structure encapsulates the plurality of light-emitting units except for portions in contact with the substrate. Each dimming sub-zone comprises at least one light-emitting unit, and the light-transmitting protective structure comprises a plurality of sub-protection structure groups corresponding to the plurality of dimming sub-zones, each sub-protection structure group encapsulating a light-emitting unit in a dimming sub-zone, and adjacent sub-protection structure groups corresponding to at least two adjacent dimming sub-zones are integrally arranged.

[0006] For example, according to an embodiment of the present disclosure, each sub-protective structure group includes at least one sub-protective structure, the number of the sub-protective structures is the same as the number of the multiple light-emitting units and is arranged in a one-to-one correspondence, and at least some of the sub-protective structures are arranged in an integrated manner.

[0007] For example, according to an embodiment of the present disclosure, the sub-protection structure corresponding to the same dimming zone is integrated.

[0008] For example, according to an embodiment of the present disclosure, the distance between the orthographic projection of the point on the substrate where the surface of one side of the sub-protection structure is the largest from the substrate and the center of the orthographic projection of the light-emitting unit covered by the sub-protection structure on the substrate does not exceed 2% of the maximum size of the orthographic projection of the light-emitting unit.

[0009] For example, according to an embodiment of the present disclosure, the surface of the integrated adjacent sub-protection structure away from the substrate includes a recessed portion bent toward the side close to the light-emitting unit, and the recessed portion is located between adjacent light-emitting units.

[0010] For example, according to an embodiment of the present disclosure, the outline of the orthographic projection of the light-transmitting protective structure on the substrate includes a plurality of curve segments connected in sequence, each curve segment bends toward a side away from the center of the orthographic projection of the light-transmitting protective structure, and the distance between at least one endpoint of the curve segment and the center of the orthographic projection of the light-transmitting protective structure is less than the distance between other points on the curve segment and the center of the orthographic projection of the light-transmitting protective structure.

[0011] For example, according to an embodiment of the present disclosure, at least one curve segment is an arc segment, the radius of the circle where the arc segment is located is r, the distance between the centers of adjacent light-emitting units is L, and L and r satisfy the relationship: L / 2≤r≤L.

[0012] For example, according to an embodiment of the present disclosure, at least some of the curved segments are arc segments, and the radius of the circle in which the arc segments are located is r; the plurality of light-emitting units are arranged in an array along a first direction and a second direction, the first direction is perpendicular to the second direction, the pitch of the light-emitting units arranged along the first direction is a first pitch p1, and the pitch of the light-emitting units arranged along the second direction is a second pitch p2, and the first pitch is not less than the second pitch, then p1 and r satisfy the relationship: {[(p1) 2 +(p2) 2 ] 1 / 2} / 2≤r≤p1.

[0013] For example, according to an embodiment of the present disclosure, the multiple light-emitting units are arranged in an array along a first direction and a second direction, the first direction intersects with the second direction, the minimum distance between the recessed portion set between adjacent light-emitting units arranged along the first direction and the substrate is a first distance, and the minimum distance between the recessed portion set between adjacent light-emitting units arranged along the second direction and the substrate is a second distance, and the ratio of the first distance to the second distance is 0.95 to 1.05.

[0014] For example, according to an embodiment of the present disclosure, the multiple light-emitting units include adjacent light-emitting units arranged along a third direction, the first direction and the second direction both intersect with the third direction, the minimum distance between the recessed portion between the adjacent light-emitting units arranged along the third direction and the substrate is a third distance, and the first distance is greater than the third distance.

[0015] For example, according to an embodiment of the present disclosure, the multiple light-emitting units are arranged in an array along a first direction and a second direction, and the spacing between the multiple light-emitting units in the first direction is equal to the spacing between the multiple light-emitting units in the second direction, the multiple sub-protective structures are an integrated structure, and the surface of the light-transmitting protection structure away from the substrate side includes a free curved surface.

[0016] For example, according to an embodiment of the present disclosure, in at least some dimming partitions, a gap is set between adjacent sub-protection structure groups corresponding to adjacent dimming partitions, and the same sub-protection structure group includes a recessed portion bent toward the side close to the light-emitting unit on the surface of the side away from the substrate, and the recessed portion is located between adjacent light-emitting units.

[0017] For example, according to an embodiment of the present disclosure, the plurality of light-emitting units include peripheral light-emitting units closest to the outline of the positive projection of the light-transmitting protection structure on the substrate, and the number of the plurality of curve segments is the same as the number of the peripheral light-emitting units.

[0018] For example, according to an embodiment of the present disclosure, the curve segment includes an arc segment, and the central angle of the circle where the arc segment is located is not greater than 280 degrees.

[0019] For example, according to an embodiment of the present disclosure, the light-emitting substrate further includes a reflective pattern including an opening and a reflective layer surrounding the opening. The opening is configured to expose the light-emitting unit, and along a direction perpendicular to the substrate, the reflective layer overlaps the light-transmitting protective structure and is located between the light-transmitting protective structure and the substrate.

[0020] For example, according to an embodiment of the present disclosure, the light-emitting substrate further includes a driving chip configured to control at least one dimming zone, and the reflective layer covers the driving chip.

[0021] 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%.

[0022] 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.

[0023] For example, according to an embodiment of the present disclosure, the light-emitting unit includes an unpackaged light-emitting diode chip, and the maximum dimension of the unpackaged light-emitting diode chip in a direction parallel to the substrate is no more than 500 micrometers.

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

[0025] Another embodiment of the present disclosure provides a display device, comprising any of the above-mentioned light-emitting substrates. 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] FIG. 1A is a plan view of a dimming zone in a general light-emitting substrate.

[0028] FIG. 1B is a brightness distribution diagram of a dimming zone shown in FIG. 1A .

[0029] FIG. 1C is a partial plan view of a general light-emitting substrate including a plurality of dimming partitions shown in FIG. 1A .

[0030] FIG. 1D is a diagram showing brightness distribution of multiple dimming zones shown in FIG. 1C .

[0031] FIG. 1E is a superimposed diagram of the plurality of dimming subareas shown in FIG. 1C and the brightness distribution diagram of the dimming subareas shown in FIG. 1D corresponding to the dimming subareas shown in FIG. 1C .

[0032] FIG2 is a schematic diagram of a planar structure of a light-emitting substrate provided according to an embodiment of the present disclosure.

[0033] FIG3 is a schematic diagram of a partial cross-section structure taken along line AA′ shown in FIG2 .

[0034] FIG. 4 is a schematic diagram of a partial cross-sectional structure taken along line BB′ shown in FIG. 2 .

[0035] FIG. 5 is a schematic diagram of a partial cross-sectional structure taken along line CC′ shown in FIG. 2 .

[0036] FIG6 is a schematic diagram of a partial planar structure of a light-emitting substrate provided according to another example of an embodiment of the present disclosure.

[0037] FIG. 7 is a schematic diagram of a partial cross-sectional structure taken along line EE′ shown in FIG. 6 .

[0038] FIG8 is a schematic plan view of a light-emitting substrate provided according to another example of an embodiment of the present disclosure.

[0039] FIG. 9 is a brightness distribution diagram of a dimming zone shown in FIG. 8 .

[0040] FIG. 10 is a diagram showing the brightness distribution of the plurality of dimming zones shown in FIG. 8 .

[0041] FIG. 11 is a superimposed diagram of the brightness distribution diagram of the dimming subareas shown in FIG. 9 and FIG. 10 corresponding to the dimming subareas shown in FIG. 1C .

[0042] FIG12 is a partial cross-sectional view of a light emitting substrate provided according to another example of an embodiment of the present disclosure.

[0043] FIG13 is a schematic diagram of a partial cross-sectional structure of a backlight source provided according to another embodiment of the present disclosure.

[0044] FIG14 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

[0045] 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.

[0046] 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.

[0047] Figure 1A is a plan view of a dimming partition 010 in a general light-emitting substrate. As shown in Figure 1A, the light-emitting substrate includes a light-emitting element 011 and a first packaging portion 012 covering the light-emitting element, a driving element 013 that drives the light-emitting element to emit light, and a second packaging portion 014 covering the driving element 013. Figure 1B is a brightness distribution diagram of a dimming partition shown in Figure 1A. Figure 1C is a partial plan view of a general light-emitting substrate including multiple dimming partitions shown in Figure 1A. Figure 1D is a brightness distribution diagram of multiple dimming partitions shown in Figure 1C. Figure 1E is an overlay of multiple dimming partitions shown in Figure 1C and Figure 1D and the corresponding brightness distribution diagrams. In each brightness distribution diagram in the present disclosure, the lighter the color, the stronger the brightness of the position, and the darker the color, the weaker the brightness of the position. For example, in each diagram, the closer to the edge of the detection area, the weaker the brightness.

[0048] During the study, the inventors of the present application found that: in order to ensure that the light pattern of the light emitted by a single light-emitting element after passing through the first packaging part is complete, it is necessary to ensure that the first packaging part corresponding to each light-emitting element and the first packaging part corresponding to the adjacent light-emitting element have no overlapping design. When the driving element is covered by the second packaging part, in order to achieve the complete light pattern of the light emitted by a single light-emitting element after passing through the first packaging part, it is necessary to ensure that the first packaging part corresponding to each light-emitting element and the second packaging part corresponding to the driving element have no overlap. For example, Figure 1A schematically shows that the orthographic projection of the second packaging part 014 is circular, but is not limited to this. The shape of the orthographic projection of the second packaging part 014 can also be an ellipse, a polygon, etc., and can also be similar to the shape of the orthographic projection of the driving element 013, as long as the second packaging part 014 can cover the driving element 013. For example, the maximum dimension in the orthographic projection of the second packaging part 014 can be smaller than the maximum dimension in the orthographic projection of the first packaging part 012.

[0049] As shown in Figures 1A and 1C, the material of the first packaging portion 012 is, for example, transparent silicone. Specifically, a highly thixotropic transparent silicone solution can be sprayed onto the area where the light-emitting element is located using a dispensing machine and then cured to form the first packaging portion 012. Since each light-emitting element corresponds to a first packaging portion, in order to avoid interference between adjacent first packaging portions and affecting the light output pattern of a single light-emitting element, it is necessary to limit the pitch P of adjacent light-emitting elements. Therefore, the above design cannot cope with a light-emitting substrate having multiple light-emitting elements arranged in an array with a smaller pitch P. The above pitch refers to the length of a line connecting the centers of two adjacent light-emitting elements arranged along the X direction or the Y direction, such as the distance between their geometric centers.

[0050] For example, as shown in FIG1A , the size of the light-emitting element 011 in the X direction is a, the size in the Y direction is b, the orthographic projection of the first packaging portion 012 is a circle, the radius of the circle is R, and the pitch between adjacent light-emitting elements 011 arranged along the X direction and adjacent light-emitting elements 011 arranged along the Y direction is P. If the driving element 013 is not provided in the light-emitting substrate, a, b, R, and P satisfy the relationship: {[(a) 2 +(b) 2 ] 1 / 2} / 2≤R≤P / 2; If a driving element 013 is provided on the light-emitting substrate, and the driving element 013 is located in the area where the light-emitting elements 011 are arranged in a 2*2 array, and the orthographic projections of the second packaging portion 014 and the first packaging portion 012 are circles with the same radius, a, b, R, and P satisfy the relationship: {[(a) 2 +(b) 2 ] 1 / 2} / 2≤R≤(2 1 / 2 *P) / 4.

[0051] The present disclosure provides a light-emitting substrate, a backlight source, and a display device. The light-emitting substrate includes a substrate, a plurality of light-emitting units located on the substrate, and a light-transmitting protective structure. The substrate includes a plurality of dimming sub-zones; the light-transmitting protective structure encapsulates the plurality of light-emitting units except for the portions in contact with the substrate. Each dimming sub-zone includes at least one light-emitting unit, and the light-transmitting protective structure includes a plurality of sub-protection structure groups arranged in a one-to-one correspondence with the plurality of dimming sub-zones. Each sub-protection structure group encapsulates a light-emitting unit in a dimming sub-zone, and adjacent sub-protection structure groups corresponding to at least two adjacent dimming sub-zones are arranged in an integrated manner.

[0052] In the light-emitting substrate provided by the present invention, each dimming partition corresponds to a sub-protection structure group that wraps the light-emitting unit within the dimming partition, and the adjacent sub-protection structure groups corresponding to at least two adjacent dimming partitions are integrated. This can ensure that the pitch of the light-emitting unit is not restricted by the size of the transparent protection structure to have a higher degree of design freedom, while achieving modulation of the light output of each dimming partition in various directions and optimized control of the overall light type, and can match the dynamic dimming partition algorithm, thereby making the light-emitting substrate have a better uniform light effect.

[0053] The light-emitting substrate, backlight source and display device provided by the embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0054] Figure 2 is a schematic diagram of a planar structure of a light-emitting substrate according to an embodiment of the present disclosure. Figure 3 is a schematic diagram of a partial cross-sectional structure taken along line AA' shown in Figure 2 .

[0055] As shown in Figures 2 and 3, the light-emitting substrate includes a substrate 01 and a plurality of light-emitting units 100 and a transparent protective structure 20 located on the substrate 01. The substrate 01 includes a plurality of dimming partitions 10; the transparent protective structure 20 wraps the plurality of light-emitting units 100 except for the portion in contact with the substrate 01. Each dimming partition 10 includes at least one light-emitting unit 100, and the transparent protective structure 20 includes a plurality of sub-protection structure groups 200 arranged in a one-to-one correspondence with the plurality of dimming partitions 10. Each sub-protection structure group 200 wraps the light-emitting unit 100 in a dimming partition 10, and the adjacent sub-protection structure groups 200 corresponding to at least two adjacent dimming partitions 10 are integrated. For example, there is no gap between the adjacent sub-protection structure groups 200 corresponding to at least two adjacent dimming partitions 10, and they are completely connected. The dimming partition 10 in this embodiment can be the same partition as the dimming partition 010 shown in Figure 1C.

[0056] FIG2 schematically shows six rows and six columns of light emitting units 100, but is not limited thereto. The number of light emitting units 100 can be greater. FIG2 schematically shows that one dimming zone 10 includes four light emitting units 100, but is not limited thereto. One dimming zone 10 can include other numbers of light emitting units 100, such as one light emitting unit 100, two light emitting units 100, an even number of light emitting units 100, a row of light emitting units 100, a column of light emitting units 100, or n 2 light emitting units 100, etc.

[0057] In the light-emitting substrate provided by the present disclosure, each dimming zone 10 corresponds to a sub-protection structure group 200 that wraps the light-emitting unit 100 within the dimming zone 10, and the adjacent sub-protection structure groups 200 corresponding to at least two adjacent dimming zones 10 are integrated, so that the pitch of the light-emitting unit 100 is not limited by the size of the transparent protection structure 20. For example, there is no need to consider the overlap of the transparent protection structures 20 corresponding to adjacent light-emitting units 100, so as to have a higher degree of design freedom while realizing the modulation of the light output of each dimming zone 10 in various directions and the optimization control of the overall light type, and can match the local dimming algorithm, so that the light-emitting substrate has a better uniform light effect.

[0058] For example, the regional dimming algorithm can adjust the brightness of the light-emitting unit 100 by region to achieve effects such as weak halo, high picture uniformity, high contrast and high brightness. The sub-protection structure group 200 set in the dimming zone 10 covers the light-emitting unit 100 in the dimming zone 10 as a whole to modulate the light emitted by each dimming zone in various directions to optimize the control of the overall light type while matching the regional dimming algorithm, which is beneficial to further improve the uniform light effect of the light-emitting substrate.

[0059] For example, as shown in FIG2 , the embodiment of the present disclosure is described by taking the same number of light-emitting units 100 set in different dimming zones 10 as an example, but is not limited thereto. Different numbers of light-emitting units 100 can be set for dimming zones 10 at different positions according to product conditions.

[0060] For example, as shown in FIG3 , the substrate 01 may be a printed circuit board (PCB) or glass, plastic, polyimide, polymethyl methacrylate, etc. with circuits.

[0061] For example, as shown in FIG3 , a buffer layer 02 (Buffer) is provided on the substrate 01. For example, a pad 130 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 130. For example, a passivation layer 03 (Passivation layer, PVX) 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 that exposes at least the pad 130 so that the pin 110 of the light-emitting unit 100 can be electrically connected to the pad 130 exposed by the passivation layer 03. The light-emitting unit 100 can be an upright light-emitting diode or an inverted light-emitting diode. FIG3 schematically shows only the buffer layer 02 and the passivation layer 03 between the light emitting unit 100 and the substrate 01 , but is not limited thereto. Other film layers may be included between the light emitting unit 100 and the substrate 01 , such as other film layers may be included between the buffer layer 02 and the passivation layer 03 .

[0062] In some examples, as shown in FIG3 , the light-emitting substrate further includes a reflective pattern 140. The reflective pattern 140 includes an opening 142 and a reflective layer 141 surrounding the opening 142. The opening 142 is configured to expose the light-emitting unit 100. In a direction perpendicular to the substrate 01, the reflective layer 141 overlaps with the light-transmitting protective structure 20 and is located between the light-transmitting protective structure 20 and the substrate 01. For example, the reflective layer 141 is located on the side of the passivation layer 03 away from the substrate 01. For example, the light-transmitting protective structure 20 covers the reflective layer 141. For example, the material of the reflective layer 141 includes white ink and / or silicone white glue. For example, the light-transmitting protective structure 20 covers the edge of the opening 142.

[0063] For example, as shown in FIG3 , the light emitting diode may be a sub-millimeter light emitting diode (Mini LED) or a micro light emitting diode (Micro LED).

[0064] In some examples, as shown in FIG2 , the light-emitting unit 100 includes an unpackaged light-emitting diode chip, where the maximum dimension of the unpackaged light-emitting diode chip in a direction parallel to the substrate 01 is no greater than 500 microns. 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.

[0065] 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 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.

[0066] For example, as shown in FIG2 , the outline 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 length of 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 100 on the substrate 01 may be a circle, and the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 may be the diameter of the light-emitting unit 100. For example, the outline of the orthographic projection of the light-emitting unit 100 on the substrate 01 may be an ellipse, and the maximum dimension of the light-emitting unit 100 in a direction parallel to the substrate 01 may be the length of the long axis of the light-emitting unit 100. However, the planar shape of the light-emitting unit 100 is not limited to this, and the side length of the planar shape of the light-emitting unit 100 is also not greater than 500 microns.

[0067] For example, as shown in FIG3 , the light-transmitting protective structure 20 can wrap the portion of the light-emitting unit 100 other than the surface where the pin 110 is electrically connected to the pad 130, so as to encapsulate and protect the unpackaged light-emitting unit 100. For example, the light-transmitting protective structure 20 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 20. For example, there may be no gap between the light-transmitting protective structure 20 and the light-emitting unit 100 to avoid light from being reflected between the light-emitting unit 100 and the light-transmitting protective structure 20. For example, the light-transmitting protective structure 20 may be in contact with a portion of the surface of the reflective layer 141 away from the substrate 01. Of course, the embodiments of the present disclosure are not limited thereto, and other film layers may be provided on the side of the reflective layer 141 away from the substrate 01, and the light-transmitting protective structure 20 may be in contact with the surface of the other film layer away from the substrate 01.

[0068] In some examples, as shown in Figures 2 and 3, the material of the light-transmitting protective structure 20 includes organic silicone, and the refractive index of the light-transmitting protective structure 20 is 1.3 to 1.7, and the transmittance is greater than 80%. For example, the refractive index of the light-transmitting protective structure 20 is 1.47 to 1.53. For example, the transmittance of the light-transmitting protective structure 20 is greater than 90%. For example, the transmittance of the light-transmitting protective structure 20 is greater than 95%. For example, the material of the light-transmitting protective structure 20 can be transparent silicone. For example, the light emitted by the light-emitting unit 100 is refracted by the light-transmitting protective structure 20 and then emitted. The shape of the light-transmitting protective structure 20 can determine the secondary light type of the light emitted by the light-emitting unit 100. In the light-emitting substrate provided by the present disclosure, the light-transmitting protective structure 20 covering the light-emitting unit 100 can serve as a lens for optimizing the light-emitting angle of the light-emitting unit 100. Since the organic silicone has a certain refractive index, such as a refractive index greater than that of air, the light emitted by the light-emitting unit 100 is refracted when passing through the organic silicone to the air or other media, causing the secondary light type of the light emitted by the light-emitting unit 100 to change when it is emitted from the organic silicone.

[0069] In some examples, as shown in Figures 2 and 3, each sub-protection structure group 200 includes at least one sub-protection structure 210, the number of sub-protection structures 210 is the same as the number of the multiple light-emitting units 100 and is arranged in a one-to-one correspondence, and at least some of the sub-protection structures 210 are arranged in an integrated manner. For example, each dimming partition 10 includes multiple light-emitting units 100, and each sub-protection structure group 200 includes multiple sub-protection structures 210. At least some of the sub-protection structures 210 arranged in an integrated manner can be sub-protection structures 210 corresponding to the same dimming partition 10, or can be sub-protection structures 210 corresponding to different dimming partitions 10. For example, the multiple sub-protection structures 210 included in the same sub-protection structure group 200 can be integrated structures. For example, the sub-protection structures 210 included in different sub-protection structure groups 200 can be integrated structures. The above-mentioned "integrated structure" can mean that two sub-protection structures overlap in space (not just edge overlap) and are connected to form a complete monomer structure. For example, the two sub-protection structures are made of the same material or are prepared in the same process.

[0070] In some examples, as shown in FIG2 and FIG3 , the sub-protective structures 210 corresponding to the same dimming zone 10 are integrated. For example, the sub-protective structures 210 included in the same sub-protective structure group 200 are integrated. For example, the multiple sub-protective structures 210 included in the same sub-protective structure group 200 are completely connected without any gaps.

[0071] Each dimming zone 10 in the light-emitting substrate provided by the present invention includes multiple light-emitting units 100. By integrating the multiple sub-protection structures 210 in the sub-protection structure group 200 corresponding to each dimming zone 10, not only can the multiple sub-protection structures 210 corresponding to a single dimming zone 10 be designed as a whole, so as to effectively modulate the light output types of the multiple light-emitting units 100 in the dimming zone 10 while matching the dynamic dimming zone (Local Dimming) algorithm of the dimming zone 10, but also there is no need to consider the overlapping problem of adjacent sub-protection structures. The pitch of the light-emitting unit 100 can be designed to be smaller, with higher design freedom. The light-emitting substrate provided by the present invention can be implemented in Mini LED backlight products with higher partitions.

[0072] In some examples, as shown in Figures 2 and 3 , the surfaces of adjacent integrally arranged sub-protective structures 210 on the side away from the substrate 01 include a recessed portion 211 that curves toward the side closer to the light-emitting unit 100, and the recessed portion 211 is located between adjacent light-emitting units 100. For example, the recessed portion 211 may include raised portions 212 on both sides of the transparent protective structure in the X or Y direction, which are farthest from the substrate 01. For example, the recessed portion 211 may be a point on the surface of the transparent protective structure 20 on the side away from the substrate 01. For example, the raised portion 212 may be a point on the surface of the transparent protective structure 20 on the side away from the substrate 01, which is farthest from the substrate 01.

[0073] For example, as shown in FIG3 , the raised portions 212 and the recessed portions 211 may be arranged alternately. For example, the raised portions 212 and the recessed portions 211 may be arranged at equal intervals. For example, the raised portions 212 and the recessed portions 211 may be arranged at equal intervals along the X direction or the Y direction. For example, the thickness of the sub-protective structure 210 at the location of the recessed portions 211 (e.g., the dimension of the sub-protective structure 210 in a direction Z perpendicular to the substrate 01) is less than the thickness at the location of the raised portions 212.

[0074] For example, as shown in FIG3 , each sub-protective structure 210 includes a raised portion 212, and adjacent sub-protective structures 210 are connected as a whole at the position of the recessed portion 211. For example, the ratio of the distance between the raised portion 212 and the substrate 01 in different sub-protective structures 210 can be 0.9 to 1.1. For example, the distance between the raised portion 212 and the substrate 01 in different sub-protective structures 210 can be equal. For example, the distance between different recessed portions 211 and the substrate 01 can be the same or different. For example, the distance between the recessed portions 211 and the substrate 01 arranged in the same direction, such as the X direction or the Y direction, can be the same, and the distance between the recessed portions 211 and the substrate 01 arranged in different directions can be different.

[0075] 3 , in a direction perpendicular to the substrate 01 , such as the Z direction, the protrusion 212 overlaps the light emitting unit 100 . For example, in a direction perpendicular to the substrate 01 , the depression 211 overlaps the reflective layer 141 .

[0076] In some examples, as shown in FIG3 , at the point where the distance between the sub-protective structure 210 and the substrate 01 is greatest, such as at the location of the raised portion 212, the distance between the orthographic projection of the sub-protective structure 210 on the substrate 01 and the center of the orthographic projection of the light-emitting unit 100 covered by the sub-protective structure 210 on the substrate 01 does not exceed 2% of the maximum dimension of the orthographic projection of the light-emitting unit 100. For example, the distance between the orthographic projection of the sub-protective structure 212 on the substrate 01 and the center of the orthographic projection of the light-emitting unit 100 covered by the sub-protective structure 210 on the substrate 01 does not exceed 1% of the maximum dimension of the orthographic projection of the light-emitting unit 100. For example, the orthographic projection of the raised portion 212 on the substrate 01 coincides with the center of the orthographic projection of the light-emitting unit 100 on the substrate 01. For example, a straight line passing through the raised portion 212 and perpendicular to the substrate 01 passes through the geometric center of the main body of the light-emitting unit 100. For example, the orthographic projection of the recessed portion 211 on the substrate 01 coincides with the center of the space between the light-emitting units 100. For example, in a direction perpendicular to the substrate 01 , the protrusion does not overlap with the pin 110 of the light emitting unit 100 .

[0077] In some examples, as shown in Figures 2 and 3, multiple light-emitting units 100 are arranged in an array along a first direction and a second direction, where the first direction intersects the second direction, such as being perpendicular to the second direction. For example, the first direction may be an X direction and the second direction may be a Y direction, but the present invention is not limited thereto. The first direction and the second direction may be interchangeable. The spacing between the multiple light-emitting units 100 in the first direction is equal to the spacing between the multiple light-emitting units 100 in the second direction, and the multiple sub-protective structures 210 are integrated.

[0078] In the light-emitting substrate provided by the present disclosure, the light-transmitting protection structure 20 that protects all the light-emitting units 100 is provided as an integrated structure, so as to perform an integrated light uniforming design on the light-emitting substrate, which is conducive to achieving high-quality display image quality.

[0079] For example, as shown in Figures 2 and 3, the plurality of sub-protective structures 210 include a plurality of raised portions 212 arranged in an array along the first direction and the second direction, and arranged at equal intervals along the first direction and the second direction. For example, the recessed portions 211 arranged along the first direction are arranged at equal intervals, and the recessed portions 211 arranged along the second direction are arranged at equal intervals.

[0080] In some examples, as shown in FIG3 , the surface of the light-transmitting protective structure 20 covering the multiple light-emitting units 100 includes a free-form surface. For example, the surface of each sub-protective structure 210 facing away from the substrate 01 can be a spherical surface. For example, the surface of at least some of the sub-protective structures 210 facing away from the substrate 01 can have the same surface shape. For example, the surface areas of different sub-protective structures 210 facing away from the substrate 01 can be the same or different. For example, the surface areas of some sub-protective structures 210 facing away from the substrate 01 can be the same.

[0081] In some examples, as shown in FIG2 , the outline of the orthographic projection of the light-transmitting protective structure 20 on the substrate 01 includes a plurality of sequentially connected curved segments 220, each curved segment 220 curving away from the center of the orthographic projection of the light-transmitting protective structure 20, and the distance between at least one endpoint of the curved segment 220 and the center of the orthographic projection of the light-transmitting protective structure 20 is less than the distance between other points on the curved segment 220 and the center of the orthographic projection of the light-transmitting protective structure 20. For example, the entire light-transmitting protective structure 20 is an integrated structure, and the outline of the orthographic projection of the light-transmitting protective structure 20 on the substrate 01 is composed of a plurality of sequentially connected curved segments 220 end to end. For example, the shapes of different curved segments 220 can be the same or different. For example, the connection point of adjacent curved segments 220 can be located between adjacent light-emitting units 100, such as corresponding to the midpoint of a line connecting the centers of adjacent light-emitting units 100.

[0082] In some examples, as shown in FIG2 , the plurality of light-emitting units 100 include a peripheral light-emitting unit 101 closest to the outline of the orthographic projection of the light-transmitting protection structure 20 on the substrate 01, and the number of the plurality of curved segments 220 can be the same as the number of the peripheral light-emitting units 101. For example, the number of the plurality of curved segments 220 can be the same as the number of the peripheral light-emitting units 101.

[0083] For example, as shown in FIG2 , the plurality of light-emitting units 100 include a peripheral ring of light-emitting units 101, which is located near the curved segment 220 of the light-transmitting protective structure 20. For example, the peripheral light-emitting units 101 surround the other light-emitting units 102. For example, some of the light-emitting units 100 within a dimming zone 10 are peripheral light-emitting units 101. For example, all of the light-emitting units 100 within a dimming zone 10 are peripheral light-emitting units 101. For example, the light-emitting units 100 within a dimming zone 10 do not include peripheral light-emitting units 101.

[0084] For example, as shown in FIG2 , a plurality of curved segments 220 can be provided in a one-to-one correspondence with the peripheral light-emitting units 101. For example, the midpoints of some of the curved segments 220 can be substantially parallel to the first direction or the second direction along a line connecting the geometric centers of the corresponding light-emitting units 100. For example, the curved segments 220 include a plurality of first curved segments 221 and a plurality of second curved segments 222. The plurality of second curved segments 222 include two second curved segments 222 arranged end-to-end in the X direction and connected end-to-end, and another two second curved segments 222 arranged end-to-end in the Y direction. The plurality of first curved segments 221 can include four first curved segments 221, each of which includes a first end and a second end. The first end of each first curved segment 221 is connected to one end of a second curved segment 222 arranged in the X direction and located at the outermost edge, and the second end of each first curved segment 221 is connected to one end of a second curved segment 222 arranged in the Y direction and located at the outermost edge. For example, each first curved segment 221 is used to connect the two second curved segments 222 that are closest to each other and arranged in the X and Y directions, respectively. For example, multiple second curved segments 222 are sequentially connected between two first curved segments 221 arranged in the first direction, and multiple second curved segments 222 are sequentially connected between two first curved segments 221 arranged in the second direction. For example, the two endpoints of each first curved segment 221 are respectively connected to two second curved segments 222, and the two endpoints of some second curved segments 222 are both connected to a second curved segment 222. For example, the length of the first curved segment 221 is greater than the length of the second curved segment 222. For example, the ratio of the lengths of different first curved segments 221 is 0.95 to 1.01, such as 1. For example, the ratio of the lengths of different second curved segments 222 is 0.95 to 1.01, such as 1.

[0085] In some examples, as shown in FIG2 , the curve segment 220 includes an arc segment, and the central angle subtended by the arc segment is no greater than 280 degrees. For example, the central angle of the first curve segment 221 is greater than the central angle of the second curve segment 222. For example, the central angle of the first curve segment 221 is no greater than 250 degrees, such as no greater than 220 degrees, such as no greater than 180 degrees, such as greater than 90 degrees, such as greater than 100 degrees, such as greater than 110 degrees, such as greater than 120 degrees. For example, the central angle of the second curved segment 222 is not greater than 180 degrees, such as not greater than 160 degrees, such as not greater than 150 degrees, such as not greater than 130 degrees, such as not greater than 120 degrees, such as not greater than 110 degrees, such as not greater than 100 degrees, such as not greater than 90 degrees, such as not greater than 80 degrees, such as not greater than 70 degrees, such as greater than 5 degrees, such as greater than 10 degrees, such as greater than 15 degrees, such as greater than 20 degrees, such as greater than 25 degrees, such as greater than 30 degrees, such as greater than 45 degrees, such as greater than 60 degrees.

[0086] For example, as shown in FIG2 , the ratio of the central angles of different first curve segments 221 is 0.95-1.01, such as 1. For example, the ratio of the central angles of different second curve segments 222 is 0.95-1.01, such as 1.

[0087] In some examples, as shown in FIG2 , a plurality of light emitting units 100 are arranged in an array along a first direction and a second direction, wherein the first direction is perpendicular to the second direction. For example, the first direction may be an X direction and the second direction may be a Y direction, but the first direction and the second direction may be interchangeable.

[0088] Fig. 4 is a schematic diagram of a partial cross-section structure taken along line BB' shown in Fig. 2. Fig. 5 is a schematic diagram of a partial cross-section structure taken along line CC' shown in Fig. 2.

[0089] In some examples, as shown in Figures 2 to 4, the minimum distance between the recessed portion 211 provided between adjacent light-emitting units 100 arranged along the first direction and the substrate 01 is a first distance D1, the minimum distance between the recessed portion 211 provided between adjacent light-emitting units 100 arranged along the second direction and the substrate 01 is a second distance D2, and the ratio of the first distance to the second distance is 0.95 to 1.05. For example, the first distance and the second distance are equal. For example, the minimum distance between the recessed portion 211 provided between adjacent light-emitting units 100 arranged along the first direction and the reflective layer 141 is a first sub-distance, the minimum distance between the recessed portion 211 provided between adjacent light-emitting units 100 arranged along the second direction and the reflective layer 141 is a second sub-distance, and the ratio of the first sub-distance to the second sub-distance is 0.95 to 1.05. For example, the first sub-distance and the second sub-distance are equal.

[0090] In some examples, as shown in FIG2 , the plurality of light emitting units 100 include adjacent light emitting units 100 arranged along a third direction, and both the first direction and the second direction intersect the third direction. For example, the angle between the third direction and the first direction can be 30 to 60 degrees, such as 45 degrees.

[0091] In some examples, as shown in Figures 2 to 5, the minimum distance between the recessed portion 211 and the substrate 01 between adjacent light-emitting units 100 arranged along the third direction is a third distance D3, and the first distance D1 is greater than the third distance D3. For example, the second distance is greater than the third distance. For example, the minimum distance between the recessed portion 211 and the reflective layer 141 between adjacent light-emitting units 100 arranged along the third direction is a third sub-distance, such as the third sub-distance being close to zero.

[0092] For example, as shown in Figures 2 to 4 , the distance between adjacent light-emitting units 100 arranged along the third direction is greater than the distance between adjacent light-emitting units 100 arranged along the first direction, and the distance between the recessed portion 211 located between adjacent light-emitting units 100 arranged along the third direction and the substrate 01 is less than the distance between the recessed portion 211 located between adjacent light-emitting units 100 arranged along the first direction and the substrate 01. For example, the greater the distance between adjacent light-emitting units 100, the smaller the distance between the recessed portion 211 between the adjacent light-emitting units 100 and the substrate 01. For example, the distance between adjacent light-emitting units 100 arranged along different directions is different, and the distance between the recessed portion 211 located between adjacent light-emitting units 100 arranged along different directions and the substrate 01 is different. For example, the recessed portion 211 may contact a layer closest to the light-transmitting protective structure 20, such as the reflective layer 141.

[0093] In some examples, as shown in FIG2 , the curve segment 220 is an arc segment, the radius of the circle where the arc segment is located is r, the distance between the centers of adjacent light-emitting units 100 is L, and L and r satisfy the relationship: L / 2≤r≤L.

[0094] This description uses as an example a case where the distance between the centers of adjacent light-emitting units 100 is approximately equal to the distance between adjacent light-emitting units 100 when the size of the light-emitting unit 100 differs significantly from the size of the sub-protective structure 210. If the size of the light-emitting unit 100 is considered, for example, a is the size of the light-emitting unit 100 in the direction in which the adjacent light-emitting units 100 are arranged, then L, a, and r satisfy the relationship: L / 2≤r≤(La / 2).

[0095] By setting the curved segment 220 of the contour edge of the light-transmitting protective structure 20 as an arc segment and limiting the relationship between the radius of the circle where the arc segment is located and the distance between the light-emitting units 100, it is possible to achieve an integrated setting of the sub-protective structure 210 corresponding to the adjacent light-emitting units 100 in any direction while preventing the sub-protective structure 210 from covering the light-emitting units 100 other than the light-emitting units 100 corresponding to it and changing its light output pattern.

[0096] For example, as shown in FIG2 , the distance L between the centers of the adjacent light-emitting units 100 may be the pitch Pitch of the adjacent light-emitting units 100. For example, L and r satisfy the relationship: 0.6*L≤r≤0.9*L. For example, L and r satisfy the relationship: 0.7*L≤r≤0.8*L. For example, the distances between adjacent light-emitting units 100 arranged in different directions may be the same, both L. FIG2 schematically shows that L may be the distance between the centers of two adjacent light-emitting units 100 arranged in a first direction, but is not limited thereto. L may also be the distance between the centers of two adjacent light-emitting units 100 arranged in a second direction, or the distance between the centers of two adjacent light-emitting units 100 arranged in a third direction.

[0097] For example, as shown in Figures 2 and 3, the orthographic projection of each sub-protective structure 210 on substrate 01 is located within a circular area, and the orthographic projection of the center of the surface of the sub-protective structure 210 on the side away from substrate 01 on substrate 01 substantially coincides with the center of the circular area. The radius of the circular area is the radius r of the circle within which the arc segment lies. For example, the center of the orthographic projection of the light-emitting unit 100 on substrate 01 substantially coincides with the center of the circular area. This substantial coincidence means that, taking into account process variations, the ratio of the distance between the two points to the radius r is no greater than 0.05, such as no greater than 0.02, and the distance between the two points is infinitely close to zero.

[0098] For example, as shown in FIG2 , each curved segment 220 of the light-transmitting protective structure 20 is an arc segment, and the radius of the circle in which each arc segment lies is substantially equal. The aforementioned substantially equal means that, taking into account process variations, the ratio of the radii of the circles in which different arc segments lie is 0.95 to 1.05, which is infinitely close to 1.

[0099] In some examples, as shown in FIG2 , the pitch of the light emitting units 100 arranged along the first direction is a first pitch p1, and the pitch of the light emitting units 100 arranged along the second direction is a second pitch p2. The first pitch is not less than the second pitch, and p1 and r satisfy the relationship: {[(p1) 2 +(p2) 2 ] 1 / 2} / 2≤r≤p1.

[0100] Here, the pitch of adjacent light-emitting units 100 is approximately equal to the distance between adjacent light-emitting units 100 when the size of the light-emitting unit 100 is significantly different from the size of the sub-protective structure 210. If the size of the light-emitting unit 100 is taken into consideration, such as the size of the light-emitting unit 100 in the first direction is a and the size in the second direction is b, then p1, p2, a, b, and r satisfy the relationship: {[(p1) 2 +(p2) 2 ] 1 / 2} / 2≤r≤(p1-a / 2).

[0101] By setting the curved segment 220 of the contour edge of the light-transmitting protective structure 20 as an arc segment and limiting the relationship between the radius of the circle where the arc segment is located and the distance between the light-emitting units 100, it is possible to achieve an integrated setting of the sub-protective structure 210 corresponding to the adjacent light-emitting units 100 in any direction while preventing the sub-protective structure 210 from covering the light-emitting units 100 other than the light-emitting units 100 corresponding to it and changing its light output pattern.

[0102] For example, as shown in Figure 2, when the first pitch and the second pitch are equal and both are p, p and r satisfy the relationship: 2 1 / 2*p / 2≤r≤p. For example, the plurality of light emitting units 100 are arranged at equal intervals along the first direction and the second direction.

[0103] Figure 6 is a schematic diagram of a partial planar structure of a light-emitting substrate provided according to another example of an embodiment of the present disclosure. Figure 7 is a schematic diagram of a partial cross-sectional structure taken along line EE' in Figure 6. The light-emitting substrate shown in Figure 6 differs from the light-emitting substrate shown in Figure 2 in that the light-transmitting protective structure 20 is different.

[0104] In some examples, as shown in Figures 6 and 7 , in at least some dimming subzones 10, gaps 011 are provided between adjacent sub-protective structure groups 200 corresponding to adjacent dimming subzones 10, and the surface of the same sub-protective structure group 200, facing away from the substrate 01, includes a recessed portion 211 that curves toward the side closer to the light-emitting unit 100, with the recessed portion 211 located between adjacent light-emitting units 100. Figure 6 schematically illustrates a dimming subzone 10 including four light-emitting units 100, but the present invention is not limited thereto. The number of light-emitting units 100 in a dimming subzone 10 can be set as needed.

[0105] For example, as shown in Figures 6 and 7, each sub-protection structure group 200 includes at least one sub-protection structure 210, the number of sub-protection structures 210 is the same as the number of multiple light-emitting units 100 and is arranged one-to-one, and the multiple sub-protection structures 210 corresponding to the same dimming zone 10 are integrated.

[0106] For example, as shown in Figures 6 and 7, adjacent sub-protection structure groups 200 may be an integrated structure in some areas, while having a gap 011 in another area. Of course, the embodiments of the present disclosure are not limited thereto, and the adjacent sub-protection structure groups 200 are completely spaced apart. Figure 6 schematically shows that gaps are provided between adjacent sub-protection structure groups arranged along the X direction and adjacent sub-protection structure groups arranged along the Y direction. However, the embodiments of the present disclosure are not limited thereto, and gaps may be provided between adjacent sub-protection structure groups arranged along one of the X direction and the Y direction, and there may be no gaps at all between adjacent sub-protection structure groups arranged along the other of the X direction and the Y direction, such as adjacent sub-protection structure groups are connected to form an integrated structure at all positions.

[0107] For example, as shown in Figures 6 and 7, multiple light-emitting units 100 located in the same dimming zone 10 can be evenly distributed, and multiple dimming zones 10 can be evenly distributed. For example, the distance D02 between adjacent light-emitting units 100 located in the same dimming zone 10 is less than the distance D01 between adjacent light-emitting units 100 located in different dimming zones 10. For example, within the same dimming zone 10, the distance between adjacent light-emitting units 100 arranged along the X direction can be the same as the distance between adjacent light-emitting units 100 arranged along the Y direction. For example, the distance between two adjacent light-emitting units 100 located in two adjacent dimming zones 10 arranged along the X direction can be the same as or different from the distance between two adjacent light-emitting units 100 located in two adjacent dimming zones 10 arranged along the Y direction.

[0108] For example, as shown in Figures 6 and 7, the size of the gap 011 between adjacent sub-protective structure groups 200 arranged along the first direction in the first direction can be the same as the size of the gap 011 between adjacent sub-protective structure groups 200 arranged along the second direction in the second direction. For example, the size of the gap 011 between adjacent sub-protective structure groups 200 arranged along the third direction in the third direction is larger than the size of the gap 011 between adjacent sub-protective structure groups 200 arranged along the first direction in the first direction.

[0109] For example, as shown in Figures 6 and 7, at the point where the distance between the sub-protective structure 210 and the substrate 01 is greatest, such as the location of the raised portion 212, the distance between the orthographic projection of the sub-protective structure 210 on the substrate 01 and the center of the orthographic projection of the light-emitting unit 100 covered by the sub-protective structure 210 on the substrate 01 does not exceed 2% of the maximum size of the orthographic projection of the light-emitting unit 100. For example, the orthographic projection of the raised portion 212 on the substrate 01 coincides with the center of the orthographic projection of the light-emitting unit 100 on the substrate 01.

[0110] For example, as shown in Figures 6 and 7 , in some regions, the orthographic projections of different sub-protective structure groups 200 on the substrate 01 can have the same shape and area. For example, if the light-emitting substrate includes different regions, the sub-protective structure groups 200 located in different regions can have different shapes. For example, the distances between the recesses 211 and the substrate 01 in different sub-protective structure groups 200 can be substantially equal.

[0111] For example, as shown in FIG6 , the outline of the orthographic projection of each sub-protective structure group 200 on the substrate 01 includes a plurality of sequentially connected curved segments 220, each curved segment 220 curving toward a side away from the center of the orthographic projection of the sub-protective structure group 200, and the distance between at least one endpoint of the curved segment 220 and the center of the orthographic projection of the sub-protective structure group 200 is less than the distance between other points on the curved segment 220 and the center of the orthographic projection of the sub-protective structure group 200. For example, the lengths of different curved segments 220 can be the same or different.

[0112] For example, as shown in FIG6 , the curve segment 220 includes an arc segment, and the degree of the central angle of the arc segment is not greater than 280 degrees. For example, the radius of the circle where the arc segment is located is r, and the distance between the centers of adjacent light-emitting units 100 is L, and L and r satisfy the relationship: L / 2≤r≤L. For example, multiple light-emitting units 100 located in the same dimming zone 10 are arranged in an array along a first direction X and a second direction Y, and the pitch of the light-emitting units 100 arranged along the first direction is a first pitch p1, and the pitch of the light-emitting units 100 arranged along the second direction is a second pitch p2, and the first pitch is not less than the second pitch, then p1 and r satisfy the relationship: {[(p1) 2 +(p2) 2 ] 1 / 2 In this example, the relationship between r and L and the relationship between r and p1 and p2 can refer to the corresponding relationships in the substrate shown in the above example.

[0113] The light-emitting substrate provided in this example is advantageous in that a corresponding sub-protection structure group 200 is separately set for each dimming zone 10, and a gap 011 is set between adjacent sub-protection structure groups 200, which is conducive to adaptively and flexibly adjusting the light output type for different dimming zones 10. For example, the shape of the sub-protection structure group 200 corresponding to the dimming zones 10 at different positions can be specially set according to the light output requirements.

[0114] Each dimming zone 10 in the light-emitting substrate provided by the present invention includes multiple light-emitting units 100. By integrating the multiple sub-protection structures 210 in the sub-protection structure group 200 corresponding to each dimming zone 10, it is possible to realize an integrated design of the multiple sub-protection structures 210 corresponding to a single dimming zone 10, so as to effectively modulate the light output types of the multiple light-emitting units 100 in the dimming zone 10 while matching the dynamic dimming zone (Local Dimming) algorithm of the dimming zone 10.

[0115] FIG8 is a schematic plan view of a light-emitting substrate provided according to another example of an embodiment of the present disclosure.

[0116] In some examples, as shown in FIG8 , the light-emitting substrate further includes a driver chip 300 (IC), which is configured to control at least one dimming zone 10. A packaging structure is provided between the driver chip 300 and the light-transmitting protective structure 20. Specifically, the packaging structure can be used to prevent the driver chip 300 from falling due to scratches during the manufacturing process. The surface of the packaging structure can be made of a reflective material (such as white ink and / or silicone white glue), thereby improving the utilization rate of the emitted light of the surrounding light-emitting units 10. The shape of the orthographic projection of the packaging structure can be circular, elliptical, polygonal, etc., and can also be similar to the shape of the orthographic projection of the driver chip 300, as long as the packaging structure can cover the driver chip 300.

[0117] FIG8 schematically illustrates that a driver chip 300 is provided in each driver zone, so that each driver chip 300 is configured to control the brightness of the light-emitting unit 100 in one dimming zone. However, the embodiments of the present disclosure are not limited thereto, and one driver chip 300 may be configured to control the brightness of the light-emitting unit 100 in at least two dimming zones.

[0118] For example, FIG8 schematically shows that the driver chip 300 is located near the center of each dimming zone 10, but it is not limited to this. The driver chip 300 can also be moved upwards to between two adjacent light-emitting units 100, or downwards, leftwards or rightwards to between two adjacent light-emitting units 100, as long as it does not interfere with the light-emitting units 100. In order to ensure the light extraction efficiency of the light-emitting unit 100, a packaging structure will be provided on the driver chip 300, for example, the driver chip 300 is covered with a white silicone material on the side away from the substrate 01; in this way, the specific position of the driver chip 300 will basically have no effect on the overall light extraction effect of the light-emitting substrate. Generally, for a dimming zone 10, the brightness at the position corresponding to its geometric center is higher, and in the embodiment provided in the present disclosure, the thickness of the light-transmitting protective structure 20 in the central area of ​​the dimming zone 10 is thinner, and the driver chip 300 can be avoided as much as possible in the central area of ​​the dimming zone 10.

[0119] Figure 9 is a brightness distribution diagram for one dimming zone 10 shown in Figure 8. Figure 10 is a brightness distribution diagram for multiple dimming zones 10 shown in Figure 8. Figure 11 is an overlay of the multiple dimming zones 10 shown in Figures 9 and 10 and their corresponding brightness distribution diagrams. The horizontal axis (X) and vertical axis (Y) in each brightness distribution diagram represent the size of the area detected by the detector.

[0120] For example, as shown in FIG1B and FIG9, compared to a general light-emitting substrate in which each light-emitting unit 100 in each dimming zone 10 is provided with a separate lens and the lenses cannot overlap, the light-emitting substrate provided by the present disclosure has the maximum brightness at the center point when the sub-protection structure 210 is provided as an integrated structure in each dimming zone 10, and the area of ​​uniform brightness distribution in the area outside the center point is larger, thereby providing a better optical effect of the dimming zone provided by the present application. Similarly, as shown in FIG1D and FIG10, when detecting multiple dimming zones 10, the brightness uniformity in the light-emitting substrate provided by the present disclosure is significantly improved compared to the structure shown in FIG1C.

[0121] Figure 1E is a superimposed diagram of the multiple dimming zones shown in Figure 1C and the brightness distribution diagram of Figure 1D corresponding to the dimming zone shown in Figure 1C. Figure 1E schematically shows the corresponding relationship between the bright and dark areas in the brightness distribution diagram and the positions of the light-emitting unit and the driver chip.

[0122] For example, as shown in Figure 1E , in the center area of ​​the light-emitting substrate, the location of the light-emitting unit 011 is very bright, while the area between adjacent light-emitting units 011 is darker. Furthermore, there is a significant difference in brightness between the center area and the edge areas of the light-emitting substrate. For example, as shown in Figure 1E , the brightness of the light-emitting unit 100 located in the very center of the light-emitting substrate is the highest, followed by the light-emitting units 100 located in non-corner locations, and the light-emitting units 100 located at the four corners are the darkest. Therefore, a light-emitting substrate designed with a single light-emitting unit covered by a corresponding first encapsulation portion exhibits distinct bright and dark areas, resulting in poor brightness uniformity.

[0123] Fig. 11 is a superimposed diagram of the brightness distribution diagram of the dimming subareas shown in Fig. 9 and the dimming subareas shown in Fig. 10 corresponding to the dimming subareas shown in Fig. 1C. Fig. 11 schematically shows the positional relationship between the bright spot area and the light emitting unit 100 in the brightness distribution diagram.

[0124] For example, as shown in Figure 11, in the light-emitting substrate provided by the embodiment of the present disclosure, the brightness is relatively bright, both at the location of the light-emitting unit 100 and in the area between adjacent light-emitting units 100, and the brightness difference between the central area and the edge area of ​​the light-emitting substrate is relatively small. Therefore, compared with the brightness distribution diagram shown in Figure 1E, the light-emitting substrate provided by the embodiment of the present disclosure can significantly improve brightness uniformity by providing a light-transmitting protective structure covering all light-emitting units in at least one dimming zone.

[0125] FIG12 is a partial cross-sectional view of a light emitting substrate provided according to another example of an embodiment of the present disclosure.

[0126] In some examples, as shown in FIG12 , the light emitting unit 100 emits light at a wavelength of 430 to 480 nanometers, and the light-transmitting protective structure 20 includes an inorganic luminescent material 230. For example, the light emitting unit 100 includes a blue light emitting chip to emit blue light. For example, the light emitting unit 100 may emit light at a wavelength of 440 to 460 nanometers, or 450 to 470 nanometers.

[0127] For example, the inorganic luminescent material 230 may be uniformly dispersed in the light-transmitting protective structure 20 , or gathered on the light-emitting side of the light-transmitting protective structure 20 .

[0128] For example, as shown in FIG12 , the inorganic luminescent material 230 can be 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 SrBaSiO25: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 230 powder or nanoparticle inorganic luminescent material 230 powder. Another suitable class of inorganic particles is the so-called quantum dot inorganic luminescent material 230, which is made of semiconductor nanoparticles and includes: silicon (Si), germanium (Ge), cadmium sulfide (CdS), cadmium selenide (CdSe), cadmium telluride (CdTe), zinc sulfide (ZnS), zinc selenide (ZnSe), zinc telluride (ZnTe), lead sulfide (PbS), lead selenide (PbSe), lead telluride (PbTe), indium nitride (InN), indium phosphide (InP), indium arsenide (InAs), aluminum nitride (AlN), aluminum phosphide (AlP), aluminum arsenide (AlAs), gallium nitride (GaN), gallium phosphide (GaP), gallium arsenide (GaAs), and combinations thereof. Generally, the surface of each quantum dot is at least partially covered with organic molecules to prevent agglomeration and improve compatibility with the binder. In some cases, the semiconductor quantum dot can be composed of several layers of different materials within a core-shell structure. Suitable organic molecules include fluorescent dyes. The phosphor layer may be composed of a mixture of different types of phosphors 230 in a single layer or multiple layers, each layer containing one or more phosphors 230. The phosphor 230 particles in the phosphor layer may have different sizes (eg, diameters) and may be separated.

[0129] The embodiments of the present disclosure are not limited thereto. The light-emitting unit 100 may further include a red light-emitting chip and a green light-emitting chip. In this case, the inorganic light-emitting material 230 may not be provided in the light-transmitting protection structure 20 .

[0130] There are many processes for forming the light-transmitting protective structure 20 provided in the embodiment of the present disclosure, such as any one of photolithography, printing, spray printing, pad printing, embossing, molding, coating, etc.

[0131] Fig. 13 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 Fig. 13 , the backlight source includes the light-emitting substrate 1000 in any of the above examples.

[0132] For example, as shown in FIG13 , the backlight further includes a light diffusion structure 1001 located on the light-emitting side of the light-emitting substrate 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 diffuser film with a microstructure on its surface. However, this is not limiting and the light diffusion structure may include multiple diffusion layers.

[0133] For example, the backlight source may further include film layers (not shown) such as a diffusion layer, a brightness enhancement film, and a color conversion layer. For example, 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 substrate. For example, the brightness enhancement film may be a prism layer that functions as a light collector to increase the brightness of light emitted from a straight-angle view. For example, the color conversion layer may convert light from the light-emitting unit 100 from one color to another. For example, when the light-emitting unit 100 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 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 structure. For example, the partially reflective structure (also referred to as a dichroic structure or a dichroic filter structure) 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 230 shown in FIG. 12 may not be provided in the light-transmitting protective structure 20. For example, when the inorganic luminescent material 230 shown in FIG. 12 is provided in the light-transmitting protection structure 20 , the color conversion layer may not be provided in the backlight source.

[0134] FIG14 is a partial cross-sectional view of a display device according to another embodiment of the present disclosure. As shown in FIG14 , the display device includes the light-emitting substrate 1000 of any of the above examples. For example, as shown in FIG14 , the display device includes the backlight source shown in FIG13 .

[0135] For example, as shown in FIG14 , the display device further includes a display panel 2000 stacked with the light-emitting substrate 1000. For example, the display panel 2000 is located on the light-emitting side of the light-emitting substrate, and the light-emitting substrate is configured to provide backlight for 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.

[0136] 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.

[0137] 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.

[0138] There are a few points to note:

[0139] (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.

[0140] (2) In the absence of conflict, features in the same embodiment and different embodiments of the present disclosure may be combined with each other.

[0141] 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 substrate, comprising: A substrate including a plurality of dimming zones; A plurality of light-emitting units are located on the substrate; a light-transmitting protective structure, wrapping the plurality of light-emitting units except for the portions in contact with the substrate, Among them, each dimming zone includes at least one light-emitting unit, and the light-transmitting protection structure includes a plurality of sub-protection structure groups arranged one-to-one corresponding to the plurality of dimming zones, each sub-protection structure group wraps a light-emitting unit in a dimming zone, and adjacent sub-protection structure groups corresponding to at least two adjacent dimming zones are integrated.

2. The light-emitting substrate according to claim 1, wherein: Each sub-protection structure group includes at least one sub-protection structure, the number of the sub-protection structures is the same as the number of the plurality of light-emitting units and they are arranged in one-to-one correspondence, and at least some of the sub-protection structures are arranged in an integrated manner.

3. The light-emitting substrate according to claim 2, wherein: The sub-protection structure corresponding to the same dimming zone is integrated.

4. The light-emitting substrate according to claim 2 or 3, wherein: The distance between the orthographic projection of the point on the substrate where the surface of the sub-protection structure away from the substrate is the largest and the center of the orthographic projection of the light-emitting unit covered by the sub-protection structure on the substrate does not exceed 2% of the maximum size of the orthographic projection of the light-emitting unit.

5. The light-emitting substrate according to any one of claims 2 to 4, wherein: The surface of the integrated adjacent sub-protection structure on the side away from the substrate comprises a recessed portion bent toward the side close to the light emitting unit, and the recessed portion is located between adjacent light emitting units.

6. The light-emitting substrate according to any one of claims 1 to 5, wherein: The outline of the orthographic projection of the light-transmitting protection structure on the substrate includes a plurality of curve segments connected in sequence, each curve segment bends toward a side away from the center of the orthographic projection of the light-transmitting protection structure, and the distance between at least one endpoint of the curve segment and the center of the orthographic projection of the light-transmitting protection structure is smaller than the distance between other points on the curve segment and the center of the orthographic projection of the light-transmitting protection structure.

7. The light-emitting substrate according to claim 6, wherein: At least one curve segment is an arc segment, the radius of the circle where the arc segment is located is r, the distance between the centers of adjacent light-emitting units is L, and L and r satisfy the relationship: L / 2≤r≤L.

8. The light emitting substrate according to claim 6, wherein: At least some of the curve segments are arc segments, and the radius of the circle where the arc segment lies is r; The plurality of light-emitting units are arranged in an array along a first direction and a second direction, the first direction is perpendicular to the second direction, the pitch of the light-emitting units arranged along the first direction is a first pitch p1, the pitch of the light-emitting units arranged along the second direction is a second pitch p2, the first pitch is not less than the second pitch, then p1 and r satisfy the relationship: {[(p1) 2 +(p2) 2 ] 1 / 2 } / 2≤r≤p1.

9. The light emitting substrate according to claim 5, wherein: The plurality of light emitting units are arranged in an array along a first direction and a second direction, wherein the first direction intersects with the second direction. The minimum distance between the recessed portion arranged between adjacent light-emitting units arranged along the first direction and the substrate is a first distance, and the minimum distance between the recessed portion arranged between adjacent light-emitting units arranged along the second direction and the substrate is a second distance, and the ratio of the first distance to the second distance is 0.95 to 1.

05.

10. The light emitting substrate according to claim 9, wherein: The multiple light-emitting units include adjacent light-emitting units arranged along a third direction, the first direction and the second direction both intersect with the third direction, the minimum distance between the recessed portions between the adjacent light-emitting units arranged along the third direction and the substrate is a third distance, and the first distance is greater than the third distance.

11. The light-emitting substrate according to any one of claims 2 to 5, wherein: The multiple light-emitting units are arranged in an array along a first direction and a second direction, and the spacing between the multiple light-emitting units in the first direction is equal to the spacing between the multiple light-emitting units in the second direction. The multiple sub-protective structures are integrated structures, and the surface of the light-transmitting protection structure away from the substrate side includes a free-form surface.

12. The light emitting substrate according to claim 1, wherein: In at least some dimming partitions, gaps are provided between adjacent sub-protection structure groups corresponding to adjacent dimming partitions, and the same sub-protection structure group includes a recessed portion bent toward the side close to the light-emitting unit on a surface away from the substrate, and the recessed portion is located between adjacent light-emitting units.

13. The light emitting substrate according to claim 6, wherein: The plurality of light emitting units include peripheral light emitting units that are closest to a contour of an orthographic projection of the light-transmitting protection structure on the substrate, and the number of the plurality of curve segments is the same as the number of the peripheral light emitting units.

14. The light emitting substrate according to claim 13, wherein: The curve segment includes an arc segment, and the degree of the central angle of the circle where the arc segment is located is not greater than 280 degrees.

15. The light-emitting substrate according to any one of claims 1 to 14, further comprising: a reflective pattern comprising an opening and a reflective layer surrounding the opening, The opening is configured to expose the light-emitting unit, and along a direction perpendicular to the substrate, the reflective layer overlaps with the light-transmitting protective structure and is located between the light-transmitting protective structure and the substrate. 16 . The light-emitting substrate according to claim 15 , further comprising a driving chip configured to control at least one dimming zone, wherein the reflective layer covers the driving chip.

17. The light-emitting substrate according to any one of claims 1 to 16, 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%.

18. The light emitting substrate according to claim 17, 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.

19. The light-emitting substrate according to any one of claims 1 to 18, wherein: The light-emitting unit comprises an unpackaged light-emitting diode chip, wherein the maximum dimension of the unpackaged light-emitting diode chip in a direction parallel to the substrate is no greater than 500 micrometers.

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

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

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