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) and a plurality of light-emitting units (200) located on the substrate (01). The substrate (01) at least comprises a first region (110) and a second region (120), the first region (110) comprises the center of the substrate (01), and the second region (120) is located at the edge of the substrate (01). The plurality of light-emitting units at least comprise a plurality of first light-emitting units (210) and a plurality of second light-emitting units (220), the plurality of first light-emitting units (210) are located in the first area (110), and the plurality of second light-emitting units (220) are located in the second area (120). The distance (D1) between at least two adjacent first light emitting units (210) is greater than the distance (D2) between at least two adjacent second light emitting units (220), or the light intensity of the first light emitting units (210) is less than the light intensity of the second light emitting units (220), which is beneficial for improving the brightness uniformity of a display picture when the light emitting substrate is used for displaying, and improving the product performance; and moreover, the undesirable phenomena of darkening or bluing of the edge and the like can be solved, the product assembly difficulty is reduced, the assembly efficiency is improved, and the cost is reduced.

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] Liquid crystal display devices consist of a backlight and an LCD panel. Direct-lit backlights can be used to achieve zoned light control and reduce light leakage. Direct-lit backlights utilize sub-millimeter light-emitting diodes (Mini LEDs) as light-emitting elements, enabling ultra-thin LCDs with exceptionally high contrast and vividness, making them increasingly popular with consumers.

[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 and a plurality of light-emitting units located on the substrate. The substrate comprises at least a first region and a second region, wherein the first region comprises the center of the substrate and the second region is located at an edge of the substrate; the plurality of light-emitting units are located on the substrate. The plurality of light-emitting units comprises at least a plurality of first light-emitting units and a plurality of second light-emitting units, wherein the plurality of first light-emitting units are located in the first region and the plurality of second light-emitting units are located in the second region, and the distance between at least two adjacent first light-emitting units is greater than the distance between at least two adjacent second light-emitting units, or the light intensity of the first light-emitting unit is less than the light intensity of the second light-emitting unit.

[0006] For example, according to an embodiment of the present disclosure, the ratio of the illuminance at any point in the second zone to the illuminance at any point in the first zone is 0.6-1.

[0007] For example, according to an embodiment of the present disclosure, the second area surrounds the first area, and the minimum distance between the edge of the second area close to the center of the substrate and the edge of the light-emitting area of ​​the light-emitting substrate is no more than 30 mm.

[0008] For example, according to an embodiment of the present disclosure, the edge of the first area is connected to the edge of the second area, the multiple first light-emitting units in the first area are arranged at equal intervals, and at least some of the multiple second light-emitting units in the second area are arranged at non-equal intervals.

[0009] For example, according to an embodiment of the present disclosure, the second zone includes at least a first sub-zone and a second sub-zone, the first sub-zone is located between the second sub-zone and the first zone, and the distance between at least two adjacent second light-emitting units in the second sub-zone is smaller than the distance between at least two adjacent second light-emitting units in the first sub-zone.

[0010] For example, according to an embodiment of the present disclosure, the shape of the first area is a quadrilateral, and the multiple light-emitting units are arranged in an array in a direction parallel to the first side and the second side connected to each other of the quadrilateral, and the distance between the second light-emitting units gradually decreases along the direction from the center of the substrate to the edge and parallel to at least one of the first side and the second side.

[0011] For example, according to an embodiment of the present disclosure, the light-emitting substrate further includes: a plurality of light-transmitting protective structures, disposed in a one-to-one correspondence with the plurality of light-emitting units and enclosing the portions of the plurality of light-emitting units excluding those in contact with the substrate. The light-transmitting protective structures corresponding to the second light-emitting units within at least a portion of the second region are provided with an inorganic luminescent material, and at least a portion of the second region includes a region of the second region farthest from the center of the substrate.

[0012] For example, according to an embodiment of the present disclosure, the second region includes at least a first sub-region and a second sub-region, the first sub-region is located between the second sub-region and the first region, and the light-transmitting protective structure corresponding to at least part of the second light-emitting units in at least the second sub-region is provided with the inorganic light-emitting material.

[0013] For example, according to an embodiment of the present disclosure, the concentration of the inorganic luminescent material provided in at least one of the light-transmitting protection structures in the second sub-region is greater than the concentration of the inorganic luminescent material provided in at least one of the light-transmitting protection structures in the first sub-region.

[0014] For example, according to an embodiment of the present disclosure, the light-emitting substrate further comprises: a light conversion layer located on a side of the plurality of light-transmitting protective structures away from the substrate. The plurality of light-emitting units emit blue light, the light conversion layer is configured to convert the blue light emitted by the plurality of light-emitting units into white light, and the inorganic luminescent material is configured to convert the blue light emitted by the second light-emitting unit into white light.

[0015] For example, according to an embodiment of the present disclosure, the light conversion layer includes at least one of a quantum dot material and a fluorescent material.

[0016] For example, according to an embodiment of the present disclosure, the light intensity of the first light-emitting unit is less than the light intensity of the second light-emitting unit, the multiple light-emitting units are arranged in an array, and the multiple light-emitting units are arranged at equal intervals in at least one arrangement direction.

[0017] For example, according to an embodiment of the present disclosure, the light-emitting substrate further includes: a reflective layer located on a side of the substrate where the plurality of light-emitting units are disposed. The reflective layer includes a plurality of openings, and the plurality of openings are disposed in a one-to-one correspondence with the plurality of light-emitting units.

[0018] 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%.

[0019] 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.

[0020] An embodiment of the present disclosure provides a backlight source, comprising any of the above-mentioned light-emitting substrates.

[0021] An embodiment of the present disclosure provides a display device, comprising any of the above-mentioned light-emitting substrates. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] FIG1 is a schematic diagram of a planar structure of a light-emitting substrate provided according to an embodiment of the present disclosure.

[0024] FIG2 is a schematic diagram of the illumination distribution of a light-emitting substrate according to an embodiment of the present disclosure.

[0025] 3 and 4 are simplified diagrams of the illumination distribution light of the light-emitting substrate provided according to an embodiment of the present disclosure.

[0026] FIG5 shows different illumination curves corresponding to different spacings of the second light-emitting units in the second area.

[0027] 6 to 8 are schematic diagrams of partial cross-sectional structures taken along line AA′ shown in FIG. 1 according to different examples of the embodiment of the present disclosure.

[0028] FIG9 is a schematic diagram of a planar structure of a light-emitting substrate provided according to another example of an embodiment of the present disclosure.

[0029] FIG10 is a schematic block diagram of a backlight source according to another embodiment of the present disclosure.

[0030] FIG11 is a schematic diagram of a partial cross-sectional structure of a display device according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] During the study, the inventors of the present application found that: At present, some liquid crystal display devices that are backlit by direct-type backlight sources have the phenomenon of darkening or bluish edges when displaying pictures, which affects the overall viewing experience of users. The reasons for the darkening or bluish edges of the above-mentioned display pictures include that the direct-type backlight source includes a light-emitting panel and an optical film group located on the light-emitting side of the light-emitting panel. A plurality of light-emitting diodes are arranged in an array on the light-emitting panel, wherein the brightness distribution of each light-emitting diode is a Gaussian function. Taken together, the backlight brightness provided by the light-emitting panel as a whole to the center area of ​​the display picture is greater than the backlight brightness provided to the edge area of ​​the display picture. Therefore, the brightness of the edge area of ​​the display picture is less than the brightness of the center area, and the edge area will have a significant darkening phenomenon relative to the center area. The darkening of the edge of the display device affects the user's viewing experience, so the difference between the edge brightness and the center brightness is usually an important indicator for evaluating the display effect of the display device.

[0034] For example, to improve the brightness of the edge display screen, reflective sheets can be attached to the edge of the display screen, edge structural components such as the inner plastic frame can be tilted at a certain angle, or the edge of the film material can be processed to increase the reflectivity of the edge of the light-emitting panel in the backlight source. However, these improvements require additional components (such as reflective sheets) or special design of structural components, which increases the difficulty of structural assembly and the cost of the entire product.

[0035] During their research, the inventors of this application also discovered that currently, light conversion films used in optical film assemblies to convert blue light into white light, such as quantum dot (QD) films, suffer from edge failure. For example, compared to LEDs located in the center of the backlight panel, blue light emitted by LEDs located at the edge of the backlight panel cannot be fully converted to white light after passing through the quantum dot film, resulting in a risk of blue tinting at the edge.

[0036] Generally, the risk of blueing at the edge can be solved by attaching a strip light conversion structure to the edge of the light-emitting panel. For example, the blue light emitted by the light-emitting diode located at the edge of the light-emitting panel is converted into white light through the strip light conversion structure, which can improve the efficiency of converting blue light at the edge into white light. However, this method requires an additional attachment process, which increases the difficulty in assembling the backlight source and increases the cost of the entire product. In addition, the core material in the strip light conversion structure is phosphor. During the production process of the strip light conversion structure, the phosphor concentration and particle density will affect the efficiency of converting blue light into white light. In the actual development process, continuous experimentation, testing, and adjustment are required, resulting in a longer product development cycle. In addition, because the strip light conversion structure is attached to the corresponding area, as the product is used for a longer time, the risk of the strip light conversion structure falling off due to aging increases.

[0037] The embodiments of the present disclosure provide a light-emitting substrate, a backlight source, and a display device. The light-emitting substrate includes a substrate and a plurality of light-emitting units located on the substrate. The substrate includes at least a first area and a second area, the first area includes the center of the substrate, and the second area is located at the edge of the substrate. The plurality of light-emitting units include at least a plurality of first light-emitting units and a plurality of second light-emitting units, the plurality of first light-emitting units are located in the first area, the plurality of second light-emitting units are located in the second area, and the distance between at least two adjacent first light-emitting units is greater than the distance between at least two adjacent second light-emitting units, or the light intensity of the first light-emitting unit is less than the light intensity of the second light-emitting unit.

[0038] The light-emitting substrate provided by the present disclosure reduces the brightness difference between the first and second regions of the light-emitting substrate by setting the distance between adjacent first light-emitting units to be greater than the distance between adjacent second light-emitting units, or by setting the light intensity of the first light-emitting units to be less than the light intensity of the second light-emitting units. This improves the brightness uniformity of the display screen when the light-emitting substrate is used, thereby enhancing product performance. Furthermore, it eliminates undesirable phenomena such as darkening or bluish edges, reduces product assembly difficulty, improves assembly efficiency, and reduces costs.

[0039] 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.

[0040] Figure 1 is a schematic diagram of the planar structure of a light-emitting substrate provided according to an embodiment of the present disclosure. As shown in Figure 1 , the light-emitting substrate includes a substrate 01 and a plurality of light-emitting units 200 located on substrate 01. Substrate 01 includes at least a first region 110 and a second region 120. First region 110 comprises the center of substrate 01, and second region 120 is located at the edge of substrate 01. The center of the substrate refers to the geometric center of the substrate's principal plane parallel to the XY plane shown in Figure 1.

[0041] For example, as shown in Figure 1 , the center of substrate 01 may be the center of first region 110, but this is not limiting. The center of the substrate 01 may be relatively close to the center of the first region. For example, second region 120 may include an area surrounding first region 110, such as light-emitting units 200 located at the outermost edge of substrate 01. For example, the shape of first region 110 may be a quadrilateral, such as a parallelogram or rectangle, or a regular shape such as an ellipse or circle, or an irregular shape. For example, second region 120 may be annular. For example, Figure 1 schematically illustrates that the boundary of second region 120 near the center of substrate 01 coincides with the boundary of first region 110, but this does not limit the boundary to this. The boundary of second region 120 near the center of substrate 01 may not coincide with the boundary of first region 110, and a certain distance may exist between them. It is understood that the boundary of first region 110 may not overlap with any light-emitting unit 200, and the boundary of second region 120 may not overlap with any light-emitting unit 200.

[0042] As shown in FIG1 , the plurality of light-emitting units 200 includes at least a plurality of first light-emitting units 210 and a plurality of second light-emitting units 220. The plurality of first light-emitting units 210 are located in the first region 110, and the plurality of second light-emitting units 220 are located in the second region 120. For example, the boundary between the first region 110 and the second region 120 may be located between the first light-emitting units 210 and the second light-emitting units 220.

[0043] For example, as shown in FIG1 , different first light-emitting units 210 have the same characteristics, such as size, model, light intensity distribution, etc. For example, at least some of the plurality of second light-emitting units 220 have the same characteristics, such as size, emitted light intensity, etc. For example, in one example, the first light-emitting unit 210 and the second light-emitting unit 220 have the same characteristics.

[0044] 1 , the distance between two adjacent first light-emitting units 210 is not equal to the distance between two adjacent second light-emitting units 220. The distance between two adjacent light-emitting units 200 may refer to the distance between the centers of the two adjacent light-emitting units 200, or the distance between the edges of the two adjacent light-emitting units 200 that are close to each other.

[0045] For example, Figure 1 schematically illustrates that the distance between adjacent first light-emitting units 210 arranged along the X direction is not equal to the distance between adjacent second light-emitting units 220 arranged along the X direction in some regions, and the distance between adjacent first light-emitting units 210 arranged along the Y direction is not equal to the distance between adjacent second light-emitting units 220 arranged along the Y direction in some regions. However, this is not limiting and the distances between adjacent second light-emitting units 220 in different regions can be set based on edge brightness. For example, the distance between adjacent second light-emitting units 220 arranged in any direction within the same region of the second zone 120 is not equal to the distance between adjacent first light-emitting units 210 arranged in the same direction as any of the aforementioned directions. For example, the X direction and the Y direction may intersect, such as at an angle of 80 to 100 degrees, or may be perpendicular to each other. For example, the X direction and the Y direction may be the directions in which two adjacent edges of the substrate 01 extend.

[0046] As shown in FIG1 , in at least one example of the embodiments of the present disclosure, the distance between at least two adjacent first light-emitting units 210 is greater than the distance between at least two adjacent second light-emitting units 220. In at least one example of the embodiments of the present disclosure, the light intensity of the first light-emitting unit 210 is less than the light intensity of the second light-emitting unit 220. For example, the light intensity of the first light-emitting unit 210 and the light intensity of the second light-emitting unit 220 in the light-emitting substrate shown in FIG1 are equal.

[0047] The light-emitting substrate provided by the present disclosure is beneficial to reducing the brightness difference between the first area and the second area of ​​the light-emitting substrate by setting the distance between adjacent first light-emitting units to be greater than the distance between adjacent second light-emitting units, or the light intensity of the first light-emitting unit is less than the light intensity of the second light-emitting unit, thereby improving the uniformity of brightness of the display screen when the light-emitting substrate is used for display, making the display screen closer to the real visual effect, and improving product performance.

[0048] Compared with the method of arranging the light-emitting units in the light-emitting substrate at equal intervals, the light-emitting substrate provided by the present disclosure sets the spacing between the second light-emitting units arranged in the second area at the edge of the substrate to be smaller, thereby avoiding the steps of setting additional components to improve the edge brightness, reducing the difficulty of product assembly, improving assembly efficiency, and reducing costs.

[0049] In some examples, as shown in FIG1 , the second region 120 surrounds the first region 110, and the minimum distance between the boundary of the second region 120 near the center of the substrate 01 and the boundary of the light-emitting area of ​​the light-emitting substrate is no greater than 30 mm. For example, the edge of the second region 120 away from the center of the substrate 01 may be the edge of the light-emitting area of ​​the light-emitting substrate.

[0050] For example, the second area 120 has an annular shape, and the width of the annular ring is no greater than 30 mm. The annular width may refer to the average width or maximum width of the annular second area 120. For example, the minimum distance between the edge of the second area 120 near the center of the substrate 01 and the edge of the light-emitting area is no greater than 27 mm. For example, the minimum distance between the edge of the second area 120 near the center of the substrate 01 and the edge of the light-emitting area is no greater than 25 mm. For example, the minimum distance between the edge of the second area 120 near the center of the substrate 01 and the edge of the light-emitting area is no greater than 24 mm. For example, the minimum distance between the edge of the second area 120 near the center of the substrate 01 and the edge of the light-emitting area is no greater than 22 mm. For example, the minimum distance between the edge of the second area 120 near the center of the substrate 01 and the edge of the light-emitting area is no greater than 20 mm. For example, the minimum distance between the edge of the second area 120 near the center of the substrate 01 and the edge of the light-emitting area is no greater than 18 mm. For example, the minimum distance between the edge of the second area 120 near the center of the substrate 01 and the edge of the light-emitting area is no greater than 15 mm. For example, the minimum distance between the edge of the second area 120 near the center of the substrate 01 and the edge of the light-emitting area is no greater than 12 mm. For example, the minimum distance between the edge of the second area 120 near the center of the substrate 01 and the edge of the light-emitting area is no greater than 10 mm. For example, the minimum distance between the edge of the second area 120 near the center of the substrate 01 and the edge of the light-emitting area is no greater than 8 mm. For example, the minimum distance between the edge of the second area 120 near the center of the substrate 01 and the edge of the light-emitting area is no greater than 5 mm. For example, the minimum distance between the edge of the second area 120 near the center of the substrate 01 and the edge of the light-emitting area is no greater than 3 mm. For example, the minimum distance between the edge of the second area 120 near the center of the substrate 01 and the edge of the light-emitting area is no greater than 1 mm.

[0051] For example, as shown in FIG1 , the ring widths of the second region 120 at different locations can be the same or different. For example, the second region 120 includes a portion extending along the X direction and a portion extending along the Y direction, wherein the width of the portion extending along the X direction can be the ring width, and the width of the portion extending along the Y direction can also be the ring width. The widths of these two portions can be the same or different. For example, the width of the portion extending along the X direction in the second region 120 is smaller than the width of the portion extending along the Y direction in the second region 120. For example, the width of the portion extending along the X direction in the second region 120 is greater than the width of the portion extending along the Y direction in the second region 120.

[0052] In some examples, as shown in FIG1 , the light emitting unit 200 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 01 is no greater than 500 micrometers.

[0053] For example, as shown in FIG1 , the light emitting diode may be a sub-millimeter light emitting diode (Mini LED) or a micro light emitting diode (Micro LED).

[0054] For example, each light-emitting unit 200 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 recombined 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.

[0055] For example, as shown in FIG1 , the maximum dimension of the light-emitting unit 200 in a direction parallel to the substrate 01 is no greater than 300 micrometers. For example, the maximum dimension of the light-emitting unit 200 in a direction parallel to the substrate 01 is no greater than 250 micrometers. For example, the maximum dimension of the light-emitting unit 200 in a direction parallel to the substrate 01 is no greater than 220 micrometers. For example, the maximum dimension of the light-emitting unit 200 in a direction parallel to the substrate 01 is no greater than 200 micrometers. For example, the maximum dimension of the light-emitting unit 200 in a direction parallel to the substrate 01 is no greater than 150 micrometers.

[0056] For example, as shown in FIG1 , the outline of the orthographic projection of the light-emitting unit 200 on the substrate 01 may be a rectangle, and the maximum dimension of the light-emitting unit 200 in a direction parallel to the substrate 01 may be the length of the diagonal of the light-emitting unit 200. 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 200 on the substrate 01 may be a circle, and the maximum dimension of the light-emitting unit 200 in a direction parallel to the substrate 01 may be the diameter of the light-emitting unit 200. For example, the outline of the orthographic projection of the light-emitting unit 200 on the substrate 01 may be an ellipse, and the maximum dimension of the light-emitting unit 200 in a direction parallel to the substrate 01 may be the length of the major axis of the light-emitting unit 200. However, the planar shape of the light-emitting unit 200 is not limited to this, and the side length of the planar shape of the light-emitting unit 200 is also not greater than 500 microns.

[0057] In some examples, as shown in FIG1 , an edge of the first region 110 is adjacent to an edge of the second region 120, the plurality of first light-emitting units 210 in the first region 110 are arranged at equal intervals, and at least some of the plurality of second light-emitting units 220 in the second region 120 are arranged at non-equal intervals. For example, the second region 120 may include multiple areas, and the second light-emitting units 220 in at least one area are arranged at non-equal intervals.

[0058] For example, as shown in Figure 1, the distance between any adjacent first light-emitting units 210 arranged along the X-direction in the plurality of first light-emitting units 210 is D1, and the distance between any adjacent second light-emitting units 220 arranged along the X-direction in a first portion of the plurality of second light-emitting units 220 is D2, where D2 is smaller than D1. For example, D2 may be the larger spacing between the second light-emitting units 220 arranged unequally. For example, the distance between any adjacent second light-emitting units 220 arranged along the X-direction in a second portion of the plurality of second light-emitting units 220 is D3, where D3 is smaller than D2, and the second light-emitting units 220 in the first portion and the second light-emitting units 220 in the second portion are arranged unequally.

[0059] For example, as shown in Figure 1, the distance between the adjacent first light-emitting units 210 and the second light-emitting units 220 can be equal to the distance between adjacent first light-emitting units 210, but is not limited to this. The distance between the adjacent first light-emitting units 210 and the second light-emitting units 220 can also be equal to the distance between two adjacent second light-emitting units 220.

[0060] In some examples, as shown in Figure 1, the second region 120 includes at least a first sub-region 121 and a second sub-region 122, the first sub-region 121 is located between the second sub-region 122 and the first region 110, and the distance between at least two adjacent second light-emitting units 220 in the second sub-region 122 is smaller than the distance between at least two adjacent second light-emitting units 220 in the first sub-region 121.

[0061] Compared with the situation where the light-emitting units are evenly arranged at various positions on the light-emitting substrate, in the light-emitting substrate provided by the present disclosure, by setting the distances between adjacent second light-emitting units in different areas within the second zone to be different, it is beneficial to greatly reduce the difference between the edge brightness and the center brightness, and improve the uniformity of the picture, for example, the uniformity of the picture can be improved by more than 10%.

[0062] 1 , the edge of the first sub-region 121 close to the center of the substrate 01 is the edge of the first region 110, and the edge of the first sub-region 121 away from the center of the substrate 01 is the edge of the second sub-region 122. For example, the first sub-region 121 surrounds the first region 110, and the second sub-region 122 surrounds the first sub-region 121.

[0063] For example, as shown in FIG1 , in the region of the second region 120 located on at least one side of the first region 110 in the X direction, the distance between adjacent second light-emitting units 220 arranged in the X direction within the first sub-region 121 is D2, and the distance between adjacent second light-emitting units 220 arranged in the X direction within the second sub-region 122 is D3, where D3 is less than D2. For example, the distance between two second light-emitting units 220 located on either side of the boundary between the first sub-region 121 and the second sub-region 122 can be D2 or D3.

[0064] For example, Figure 1 schematically shows that the distance between adjacent second light-emitting units arranged along the X direction in a partial area of ​​the first sub-area is greater than the distance between adjacent second light-emitting units arranged along the X direction in a partial area of ​​the second sub-area, but is not limited to this. The distance between adjacent second light-emitting units in the first sub-area and the second sub-area can be set according to the edge brightness.

[0065] In some examples, as shown in FIG1 , the first region 110 is shaped like a quadrilateral, and the plurality of light-emitting units 200 are arranged in an array parallel to a first side 111 and a second side 112 of the quadrilateral. The distance between the second light-emitting units 220 gradually decreases along a direction extending from the center of the substrate 01 toward an edge thereof and parallel to at least one of the first side 111 and the second side 112. For example, as shown in FIG1 , the number of second light-emitting units 220 in the second region 120 located on one side of the first region 110 in the X direction and arranged along the X direction is four, and the distance D4 between two second light-emitting units 220 located on either side of the boundary between the first sub-region 121 and the second sub-region 122 is less than D2 and greater than D3.

[0066] For example, as shown in FIG1 , the first side 111 may be an edge extending along the X direction, and the second side 112 may be an edge extending along the Y direction, but the present invention is not limited thereto. The first side 111 and the second side 112 may be interchangeable. For example, the first region 110 may be rectangular, with the first side 111 and the second side 112 perpendicular. For example, the plurality of light-emitting units 200 may be arranged in an array along the X and Y directions.

[0067] For example, as shown in FIG1 , within the second region 120 located on at least one side of the first region 110 in the X direction, the distance between the second light-emitting units 220 gradually decreases along a direction extending from the center of the substrate 01 to the edge and parallel to the X direction. For example, within the second region 120 located on at least one side of the first region 110 in the Y direction, the distance between the second light-emitting units 220 gradually decreases along a direction extending from the center of the substrate 01 to the edge and parallel to the Y direction.

[0068] For example, as shown in FIG1 , the number of second light-emitting units 220 distributed within a specific area in the first sub-area 121 is smaller than the number of second light-emitting units 220 distributed within a specific area in the second sub-area 122, and the number of first light-emitting units 210 distributed within a specific area in the first area 110 is smaller than the number of second light-emitting units 220 distributed within a specific area in the first sub-area 121. The specific area may refer to the area of ​​a square with a side length of a specific value, such as a square with a side length of 1 cm or a square with a side length of 2 cm, or may refer to a unit area.

[0069] For example, as shown in FIG1 , the outer contour of the second region 120 may be a rectangle, and the distribution density of the second light-emitting units 220 in the four corner regions of the rectangle may be greater than the distribution density of the second light-emitting units 220 in other regions of the second region 120. For example, the edges of the corner regions may be connected to the edges of the first region 110, or the edges of the corner regions may be at a certain distance from the edges of the first region 110.

[0070] For example, in some examples, the light-emitting substrate includes multiple dimming zones (not shown), such as dynamic dimming zones (Local Dimming). For example, the light-emitting substrate also includes a driver chip (not shown) electrically connected to the multiple light-emitting units 200. The driver chip is configured to control the brightness of the light-emitting units 200 within at least one dimming zone. For example, each dimming zone is provided with multiple light-emitting units 200. For example, the number of first light-emitting units 210 included in the dimming zone within the first zone 110 is less than the number of second light-emitting units 220 included in the dimming zone within the second zone 120. For example, the dimming zone within the first zone 110 includes four first light-emitting units 210, and the dimming zone within the second zone 120 includes six or more second light-emitting units 220. For example, the dimming zone within the first zone 110 is a first dimming zone, and the dimming zone within the second zone 120 is a second dimming zone. The connection method of the first light-emitting units 210 in at least one first dimming zone can be the same as the connection method of the second light-emitting units 220 in at least one second dimming zone. Of course, the embodiments of the present disclosure are not limited to this, and the two connection methods can also be different. For example, the first light-emitting units 210 located in at least one first dimming zone are connected in series, and the second light-emitting units 220 located in at least one second dimming zone can be connected in series in sequence, or can be divided into multiple groups, with the second light-emitting units 220 in each group connected in series, and the second light-emitting units 220 in different groups are connected in parallel. For example, the number of first light-emitting units set in different first dimming zones is the same, and the electrical connection method is the same. For example, the number of second light-emitting units set in different second dimming zones is the same, and the electrical connection method is the same. For example, in other examples, the boundary position between the first zone 110 and the second zone 120 passes through at least one dimming zone, then the same dimming zone includes part of the first zone 110 and part of the second zone 120, such as the same dimming zone includes the first light-emitting unit 210 located in the first zone 110 and the second light-emitting unit 220 located in the second zone 120.

[0071] For example, in some examples, the shape of the orthographic projection of the light-emitting unit 200 on the substrate 01 can be a rectangle, and the light-emitting area of ​​the first light-emitting unit 210 in at least one first dimming zone can be smaller than the light-emitting area of ​​the second light-emitting unit 220 in at least one second dimming zone. For example, the light-emitting angle of the first light-emitting unit 210 in at least one first dimming zone can be smaller than the light-emitting angle of the second light-emitting unit 220 in at least one second dimming zone. For example, the light-emitting unit 200 can be an unpackaged light-emitting diode chip. The unpackaged light-emitting diode chip can be considered a Lambertian light emitter. When the light-emitting diode chip is packaged, the light-emitting angle range is +α 1 / 2 to -α 1 / 2 The light inside can be emitted, and +α 1 / 2 to -α1 / 2 Other light will essentially be prevented from emitting due to total internal reflection. For example, the brightness of the first light-emitting unit 210 in at least one first dimming zone is lower than the brightness of the second light-emitting unit 220 in at least one second dimming zone. This can be achieved, for example, by using light-emitting units of different sizes and models, or by designing the driving circuit to provide different current signals (including the current amplitude and the duration of the current's effective level) to different light-emitting units.

[0072] Figure 2 is a schematic diagram of the illumination distribution of a light-emitting substrate according to an embodiment of the present disclosure. Figures 3 and 4 are simplified diagrams of the illumination distribution of a light-emitting substrate according to an embodiment of the present disclosure.

[0073] For example, Figure 2 schematically illustrates five light-emitting units 200 arranged along a direction within a light-emitting substrate. The third light-emitting unit 200 is considered to be located at the center of the substrate, while the first and fifth light-emitting units 200 are considered to be located at the edges of the substrate. An optical film is provided on the light-emitting side of each light-emitting unit 200. The surface of the optical film closest to the light-emitting unit 200 may be surface 02 shown in Figure 2.

[0074] For example, the light emitted by the light-emitting unit 200 can be refracted and scattered by the optical film material, and the brightness distribution of the light-emitting unit 200 can be converted into the illuminance distribution of the backlight source. If measured with a illuminance meter, generally speaking, the closer the distance to the light-emitting unit 200, the greater the illuminance value will be, and vice versa. Illuminance is a physical quantity that indicates the degree to which an object is illuminated. Illuminance is related to the position of the light-emitting unit 200 and the illuminated surface of the optical film material in space. The magnitude of the illuminance is proportional to the light intensity of the light-emitting unit 200 and the cosine of the incident angle of the light, and is inversely proportional to the square of the distance from the light-emitting unit 200 to the illuminated surface of the optical film material.

[0075] For example, as shown in FIG2 , the light intensity of each light emitting unit 200 is I. The light intensity emitted by the light emitting unit 200 at the center can be decomposed into a horizontal component a and a vertical component b after acting on point A. The horizontal component a has no effect on the vertical illumination of point A. The distance between the light emitting unit 200 at the center and point A is D. Then the illumination of point A is E(A) = (I*cosθ) / D 2 The distance between the light emitting unit 200 and the illuminated surface 02 of the optical film is H, which is the optical distance (OD). If H satisfies H = D * cosθ, then the illumination at point A is E(A) = (I * cos 3 θ) / H 2The light emitting unit 200 shown in FIG2 is a light emitting unit 200 wrapped with a light-transmitting protective structure 300 (described later), and the distance H may be the minimum distance between the surface of the light-transmitting protective structure 300 away from the substrate 01 and the surface 02 .

[0076] Figures 3 and 4 use a light-emitting substrate comprising five light-emitting units 200 arranged along the V direction as an example to calculate the illuminance E(L) at the edge and the illuminance E(C) at the center, respectively. For example, the illuminance E(L) at the edge can be the illuminance at point A directly above the second light-emitting unit 220 at the edge, and the illuminance E(C) at the center can be the illuminance at point B directly above the first light-emitting unit 210 at the center. For example, the light intensity emitted by each light-emitting unit 200 is I, assuming that all light-emitting units 200 have the same brightness when the full white screen is illuminated. For example, the U direction is perpendicular to the main plane of the substrate 01, and the V direction is parallel to the main plane of the substrate 01.

[0077] For example, as shown in FIG3 , the distance between the light emitting units 200 (such as the first light emitting unit 210) located in the central area, such as the first area 110, can be Xc, and the distance between the light emitting units 200 (such as the second light emitting unit 220) located in the edge area, such as the second area 120, can be Xb. The angle between the light irradiated from the second light emitting unit 200 to point A and the U direction is θ1, the angle between the light irradiated from the third light emitting unit 200 to point A and the U direction is θ2, the angle between the light irradiated from the fourth light emitting unit 200 to point A and the U direction is θ3, and the angle between the light irradiated from the fifth light emitting unit 200 to point A and the U direction is θ4. The illuminance E(L) satisfies the relationship (1): E(L)=[I*(1+cos 3 θ1+cos 3 θ2+cos 3 θ3+cos 3 θ4)] / H 2 .

[0078] For example, substituting the above Xc and Xb into E(L) yields the equation (2): E(L) = {I*[1+H 3 / (Xb 2 +H 2 ) 3 / 2 +H 3 / ((Xb+Xc) 2 +H 2 ) 3 / 2 +H 3 / ((Xb+2*Xc) 2 + H 2 ) 3 / 2 +H 3 / ((2*Xb+2*Xc) 2 +H 2 )3 / 2 ]} / H 2 .

[0079] For example, as shown in FIG4 , the angles between the light rays irradiated to point B by the first light emitting unit 200 and the fifth light emitting unit 200 and the direction U are both θ1′, and the angles between the light rays irradiated to point B by the second light emitting unit 200 and the third light emitting unit 200 and the direction U are both θ2′. The illuminance E(C) satisfies the relationship (3): E(C)=[I*(1+2*cos 3 θ1'+2*cos 3 θ2')] / H 2 .

[0080] For example, substituting the above Xc and Xb into E(L) yields the equation (4): E(C) = {I*[1+2*H 3 / (Xc 2 +H 2 ) 3 / 2 +2*H 3 / ((Xb+Xc) 2 +H 2 ) 3 / 2 ]} / H 2 .

[0081] For example, as shown in FIG3 and FIG4 , in order to reduce the illumination difference between the central area and the edge area, the illumination E(L) and the illumination E(C) satisfy the relationship (5): E(L)≈E(C).

[0082] The closer the illumination values ​​on both sides of the approximately equal sign are, the closer the display effect of the central area of ​​the light-emitting substrate is to that of the edge area.

[0083] Substituting the above equations (2) and (4) into equation (5) yields equation (6): {I*[1+H 3 / (Xb 2 +H 2 ) 3 / 2 +H 3 / ((Xb+Xc) 2 +H 2 ) 3 / 2 +H 3 / ((Xb+2*Xc) 2 +H 2 ) 3 / 2 + H 3 / ((2*Xb+2*Xc) 2 +H 2 ) 3 / 2 ]} / H 2 ≈{I*[1+2*H 3 / (Xc 2 +H2 ) 3 / 2 +2*H 3 / ((Xb+Xc) 2 +H 2 ) 3 / 2 ]} / H 2 .

[0084] The above relationship (6) is simplified to get the relationship (7): 1 / (Xb 2 +H 2 ) 3 / 2 +1 / [(Xb+2*Xc) 2 +H 2 ] 3 / 2 +1 / [(2*Xb+2*Xc) 2 +H 2 ] 3 / 2 ≈2 / (Xc 2 + H 2 ) 3 / 2 +1 / [(Xb+Xc) 2 +H 2 ] 3 / 2 .

[0085] For example, as shown in Figures 3 and 4, the value on the left side of the equation in equation (7) is represented as L0, and the value on the right side of the equation is represented as C0. Xc is 5 mm, H is 2 mm, and Xb is 5 mm, 4.5 mm, 4.3 mm, 4 mm, and 3.75 mm, respectively. The L0 values ​​are 0.0068, 0.0088, 0.0099, 0.0117, and 0.0136, respectively, and the C0 values ​​are 0.0137, 0.0139, 0.0140, 0.0141, and 0.0142, respectively. Thus, L0 / C0 are 49.6%, 63.3%, 70.7%, 83%, and 95.8%, respectively. When the distance between the light-emitting units 200 in the edge area is equal to the distance between the light-emitting units 200 in the center area, the ratio of the illuminance in the edge area to the illuminance in the center area is about 50%, which is a large difference. By setting the distance between the light-emitting units 200 in the edge area to be smaller than the distance between the light-emitting units 200 in the center area, the difference in illuminance between the edge area and the center area can be reduced. For example, by adjusting the distance between the light-emitting units 200 in the edge area, the illuminance ratio of the two areas can be adjusted to about 96%, thereby greatly improving the uniformity of the light-emitting substrate.

[0086] FIG5 shows different illumination curves corresponding to different spacings of the second light-emitting units in the second area.

[0087] For example, as shown in Figure 5 , optical simulation software can be used to simulate the illumination enhancement effect of the second light-emitting units 220 at different spacings within the second zone 120. In the simulation graph shown in Figure 5 , the abscissa represents the horizontal distance between the illumination sampling point and the center of the light-emitting substrate, and the ordinate represents the normalized illumination at the edge illumination sampling points in curve F1 (equally spaced), normalized to 1. For example, the simulation curve shown in Figure 5 shows the illumination variation within a 24 mm interval, moving from the edge of the light-emitting substrate toward the center.

[0088] For example, taking the light-emitting substrate corresponding to the simulation curve shown in FIG5 as an example, the light-emitting substrate includes 10 light-emitting units 200 arranged along the V direction shown in FIG3 and FIG4, F1 represents a curve of the illumination variation with distance of the light-emitting substrate in which the distance between adjacent first light-emitting units 210 in the first area 110 is 1 mm, and the distance between adjacent second light-emitting units 220 in the second area 120 is also 1 mm, and F2 represents a light-emitting substrate in which the distance between adjacent first light-emitting units 210 in the first area 110 is 1 mm, and the spacing between multiple second light-emitting units 220 in the second area 120 is 0.98 mm, 0.98 mm, 0.93 mm, and 0.93 mm, respectively. illuminance curves varying with distance. F3 represents a curve showing illuminance variation with distance for a light-emitting substrate in which the distance between adjacent first light-emitting units 210 in the first zone 110 is 1 mm, and the spacing between second light-emitting units 220 in the second zone 120 is 0.93 mm, 0.93 mm, 0.87 mm, and 0.87 mm, respectively. F4 represents a curve showing illuminance variation with distance for a light-emitting substrate in which the distance between adjacent first light-emitting units 210 in the first zone 110 is 1 mm, and the spacing between second light-emitting units 220 in the second zone 120 is 0.87 mm, 0.87 mm, 0.87 mm, 0.65 mm, and 0.65 mm, respectively. Curve F1 represents a uniform arrangement of light-emitting units 200 in the light-emitting substrate, such as an arrangement of light-emitting units 200 at equal intervals. Curves F2 to F4 represent a situation in which the spacing between adjacent first light-emitting units 210 in the light-emitting substrate is greater than the spacing between adjacent second light-emitting units 220, such as an arrangement of light-emitting units 200 at uneven intervals on the light-emitting substrate.

[0089] For example, as shown in FIG5 , the ratio of the illuminance at the edge position to the illuminance at the center position in the F1 curve is 0.481; the ratio of the illuminance at the edge position to the illuminance at the center position in the F2 curve is 0.483; the ratio of the illuminance at the edge position to the illuminance at the center position in the F3 curve is 0.533. Compared with the luminous substrate corresponding to the F1 curve, the edge uniformity of the luminous substrate corresponding to the F3 curve is improved by 11%; the ratio of the illuminance at the edge position to the illuminance at the center position in the F4 curve is 0.548. Compared with the luminous substrate corresponding to the F1 curve, the edge uniformity of the luminous substrate corresponding to the F4 curve is improved by 14%. It can be seen that, compared with the case where the luminous units in the luminous substrate are arranged at equal intervals, the luminous substrate provided by the present disclosure, in which the spacing between the second luminous units 220 in the second zone 120 is smaller than the spacing between the first luminous units 210 in the first zone 110, and the luminous substrate in which the second luminous units 220 in the second zone 120 are arranged at non-equal intervals, is conducive to significantly improving the edge brightness, such as improving the edge brightness uniformity of the luminous substrate by more than 10%.

[0090] The logical deduction corresponding to the above-mentioned relational expressions (1) to (7) provided by the present disclosure is based on the example of changing the spacing between the light-emitting units. By setting the second light-emitting units in the second area to be arranged at non-uniform spacing, the uniformity of the display image when the light-emitting substrate is applied to the display device can be significantly improved. Of course, the embodiments of the present disclosure are not limited to this. For the above-mentioned relational expressions (1) to (6), Xb and Xc can be set to be equal or both can be set to a certain value. The light intensity I in the illuminance E(L) L and the light intensity I in illuminance E(C) C If the light intensity of the first light emitting unit is different from that of the second light emitting unit, C Then, I is obtained by approximating the values ​​on both sides of the equal sign. L .

[0091] Through the above-mentioned equations (1) to (6), the light intensity of the second light-emitting unit can be adaptively adjusted to be greater than the light intensity of the first light-emitting unit, or the distance between adjacent second light-emitting units can be smaller than the distance between adjacent first light-emitting units to achieve an improvement in the edge illumination of the light-emitting substrate, thereby improving the display uniformity.

[0092] In some examples, as shown in FIG1 , the ratio of the illuminance at any point in the second area 120 to the illuminance at any point in the first area 110 is 0.6 to 1. The illuminance at any point mentioned above refers to the illuminance at any point on the surface 02 shown in FIG3 and FIG4 illuminated by all light-emitting units 200. For example, the illuminance at any point in the second area 120 may be the illuminance at point A, and the illuminance at any point in the first area 110 may be the illuminance at point B.

[0093] In the light-emitting substrate provided by the present disclosure, the light intensity of the first light-emitting unit and the light intensity of the second light-emitting unit can be set according to the above-mentioned relationship formula (1) to relationship formula (6) to reduce the illumination difference or brightness difference between the first area and the second area, or the spacing between the first light-emitting units and the spacing between the second light-emitting units can be adjusted to reduce the illumination difference or brightness difference between the first area and the second area, thereby improving the brightness uniformity of the display screen. For example, all light-emitting substrates in which the spacing between the first light-emitting units and the spacing between the second light-emitting units meet the above-mentioned relationship formula (1) to relationship formula (6) are within the scope of protection of this application.

[0094] For example, as shown in FIG1 , the ratio of the illuminance at any point in the second zone 120 to the illuminance at any point in the first zone 110 is 0.7 to 0.8. For example, the ratio of the illuminance at any point in the second zone 120 to the illuminance at any point in the first zone 110 is 0.75 to 0.9. For example, the ratio of the illuminance at any point in the second zone 120 to the illuminance at any point in the first zone 110 is 0.65 to 0.95. For example, the ratio of the illuminance at any point in the second zone 120 to the illuminance at any point in the first zone 110 is 0.78 to 0.99. For example, the ratio of the illuminance at any point in the second zone 120 to the illuminance at any point in the first zone 110 is 0.86 to 0.97. For example, the ratio of the illuminance at any point in the second zone 120 to the illuminance at any point in the first zone 110 is 0.82 to 0.92. For example, the ratio of the illuminance at any point in the second area 120 to the illuminance at any point in the first area 110 is 0.68 to 0.91. For example, the ratio of the illuminance at any point in the second area 120 to the illuminance at any point in the first area 110 is 0.66 to 0.88. For example, the ratio of the illuminance at any point in the second area 120 to the illuminance at any point in the first area 110 is 0.76 to 0.89.

[0095] FIG6 is a schematic diagram of a partial cross-sectional structure taken along line AA′ shown in FIG1 according to an example of an embodiment of the present disclosure.

[0096] In some examples, as shown in FIG6 , the light-emitting substrate further includes a reflective layer 600 located on one side of the substrate 01 where the plurality of light-emitting units 200 are provided. The reflective layer 600 includes a plurality of openings 601, and the plurality of openings 601 are provided in a one-to-one correspondence with the plurality of light-emitting units 200. For example, the light-emitting substrate may be a direct-down structure. For example, the reflective layer 600 is configured to change the propagation direction of light incident thereon away from the surface of the substrate 01 so that it is emitted toward the light conversion layer 500 (described later). For example, the reflective layer 600 may be located in an area between adjacent light-emitting units 200 on the substrate 01, as well as between the main body of the light-emitting unit 200 and the substrate 01.

[0097] The light-emitting substrate provided by the present disclosure can directly solve the problem of poor edge image display at low cost and high efficiency, and can be used in direct-lit backlights to significantly improve the uniformity of the display image and enhance product performance.

[0098] For example, as shown in FIG6 , the material of the reflective layer 600 may include white ink and / or silicone-based white glue.

[0099] For example, as shown in FIG. 6 , in a direction perpendicular to the substrate 01 , the light emitting unit 200 and the reflective layer 600 do not overlap.

[0100] For example, as shown in FIG6 , a buffer layer 04 (Buffer) is provided on the substrate 01. For example, a pad is provided on the side of the buffer layer 04 away from the substrate 01, and the light-emitting unit 200 includes a pin and a light-emitting body, and the pin of the light-emitting unit 200 is electrically connected to the pad. For example, a passivation layer 03 (Passivation layer, PVX) is also provided on the side of the buffer layer 04 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 601 that at least exposes the pad 130 so that the pin of the light-emitting unit 200 can be electrically connected to the pad exposed by the passivation layer 03. The light-emitting unit 200 can be an upright light-emitting diode or an inverted light-emitting diode. FIG6 only schematically shows the buffer layer 04 and the passivation layer 03 between the light-emitting unit 200 and the substrate 01, but is not limited thereto. Other film layers may also be included between the light-emitting unit 200 and the substrate 01, such as other film layers may also be included between the buffer layer 04 and the passivation layer 03.

[0101] In some examples, as shown in FIG6 , the light-emitting substrate further includes a plurality of light-transmitting protective structures 300 , which are arranged in a one-to-one correspondence with the plurality of light-emitting units 200 and encapsulate the portions of the plurality of light-emitting units 200 excluding those in contact with the substrate 01 . For example, FIG6 schematically illustrates that the light-transmitting protective structures 300 and the reflective layer 600 do not overlap in a direction perpendicular to the substrate 01 , but the invention is not limited thereto; the edges of the light-transmitting protective structures 300 may overlap the edges of the reflective layer 600 . For example, the plurality of light-transmitting protective structures 300 may be arranged at intervals.

[0102] For example, as shown in FIG6 , the light-transmitting protective structure 300 can encapsulate and protect the unpackaged light-emitting unit 200 except for the surface where the pins and pads are electrically connected. For example, the light-transmitting protective structure 300 can be in direct contact with the light-emitting unit 200, such as the surface and side surface of the light-emitting unit 200 away from the substrate 01. For example, there can be no gap between the light-transmitting protective structure 300 and the light-emitting unit 200 to prevent light from reflecting between the light-emitting unit 200 and the light-transmitting protective structure 300.

[0103] In some examples, as shown in FIG6 , the material of the light-transmitting protective structure 300 includes organic silicone, and the refractive index of the light-transmitting protective structure 300 is 1.3 to 1.7, and the transmittance is greater than 80%. For example, the refractive index of the light-transmitting protective structure 300 is 1.47 to 1.53. For example, the transmittance of the light-transmitting protective structure 300 is greater than 90%. For example, the transmittance of the light-transmitting protective structure 300 is greater than 92%. For example, the transmittance of the light-transmitting protective structure 300 is greater than 93%. For example, the transmittance of the light-transmitting protective structure 300 is greater than 94%. For example, the transmittance of the light-transmitting protective structure 300 is greater than 95%. For example, the transmittance of the light-transmitting protective structure 300 is greater than 96%. For example, the transmittance of the light-transmitting protective structure 300 is greater than 97%.

[0104] For example, as shown in FIG6 , the material of the light-transmitting protective structure 300 can be transparent silicone. For example, the light emitted by the light-emitting unit 200 is emitted after being refracted by the light-transmitting protective structure 300. The shape of the light-transmitting protective structure 300 can determine the secondary light type of the light emitted by the light-emitting unit 200. In the light-emitting substrate provided by the present disclosure, the light-transmitting protective structure covering the light-emitting unit can be used as a lens to optimize the light-emitting angle of the light-emitting unit. Since 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 is refracted when passing from the organic silicone to the air or other medium, so that the secondary light type of the light emitted by the light-emitting unit changes when it is emitted from the organic silicone.

[0105] In some examples, as shown in Figure 6, the light-emitting substrate also includes a light conversion layer 500, which is located on the side of the multiple light-transmitting protective structures 300 away from the substrate 01, and the multiple light-emitting units 200 emit blue light. The light conversion layer 500 is configured to convert the blue light emitted by the multiple light-emitting units 200 into white light.

[0106] For example, as shown in FIG6 , the light emitting unit 200 has an output wavelength of 430 to 480 nanometers. For example, the light emitting unit 200 includes a blue light emitting chip to emit blue light. For example, the light emitting unit 200 may have an output wavelength of 440 to 460 nanometers, or 450 to 470 nanometers.

[0107] In some examples, as shown in FIG. 6 , light conversion layer 500 includes at least one of a quantum dot material and a fluorescent material.

[0108] For example, as shown in FIG6 , the light conversion layer 500 can convert the light from the light emitting unit 200 from one color to another. For example, when the light emitting unit 200 emits blue light, the light conversion layer 500 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, quantum dots (QDs), which can also be called nanocrystals, have a particle size generally between 1 and 20 nm. Because electrons and holes are quantum confined, the continuous energy band structure becomes a discrete energy level structure with molecular characteristics, and after being stimulated, it can emit light of a different color from the excitation light. For example, the fluorescent material can be inorganic particles, organic particles, or organic molecules, or a combination thereof. Of course, the embodiments of the present disclosure are not limited to this, and the light conversion layer 500 may also include a partially reflective structure. For example, the partially reflective structure (also referred to as a dichroic structure or a dichroic filter structure) can reflect all red and green light, and partially reflect blue light.

[0109] Figure 7 is a partial cross-sectional view of another embodiment of the present disclosure taken along line AA' in Figure 1. The difference between the light-emitting substrate shown in Figure 7 and the light-emitting substrate shown in Figure 6 lies in the provision of a light-transmitting protective structure 300.

[0110] In some examples, as shown in FIG7 , the light-transmitting protective structure 300 corresponding to the second light-emitting unit 220 in at least a portion of the second region 120 is provided with an inorganic light-emitting material 400, and at least a portion of the second region 120 includes a region of the second region 120 that is farthest from the center of the substrate 01. For example, the at least a portion of the second region 120 may be a region of the second region 120 located at an edge of the light-emitting substrate.

[0111] In some examples, as shown in FIG. 7 , the inorganic luminescent material 400 is configured to convert at least a portion of the blue light emitted by the second light emitting unit 220 into white light.

[0112] Compared with the structure in which no luminescent material is added to the light-transmitting protective structure at the edge of a general light-emitting substrate, the light-emitting substrate provided by the present invention provides an inorganic luminescent material in the light-transmitting protective structure at least in the edge area of ​​the second zone, which is beneficial for directly solidifying the light conversion method of converting blue light into white light at the edge of the light-emitting substrate on the light-emitting substrate, effectively overcoming the problem of blue edge caused by edge failure of the light conversion layer, such as the quantum dot layer, thereby improving the picture effect of the light-emitting substrate and greatly reducing the complexity of the structural assembly and the specification requirements for the light conversion film, making the cost lower; in addition, it can also avoid the risk of structural failure after long-term use of the product.

[0113] The solution provided by the present disclosure of setting an inorganic luminescent material in the light-transmitting protective structure that wraps the second light-emitting unit in the light-emitting substrate is applicable to the solution in which all light-emitting units in the light-emitting substrate are evenly arranged, and the solution in which the light intensity of the first light-emitting unit and the second light-emitting unit are the same.

[0114] For example, as shown in FIG. 7 , the inorganic luminescent material 400 may be uniformly dispersed in the light-transmitting protection structure 300 , or gathered on the light-emitting side of the light-transmitting protection structure 300 .

[0115] For example, as shown in FIG7 , the inorganic luminescent material 400 may include phosphor particles, such as those composed of a fluorescent material. The fluorescent material may be an inorganic particle, an organic particle, or an organic molecule, or a combination thereof. Suitable inorganic particles include doped garnets (such as YAG:Ce and (Y,Gd)AG:Ce), aluminates (such as Sr2Al14O25:Eu and BAM:Eu), silicates (such as SrBaSiO:Eu), sulfides (such as ZnS:Ag, CaS:Eu, and SrGa2S4:Eu), oxysulfides, oxynitrides, phosphates, borates, and tungstates (such as CaWO4). These materials may be in the form of a powder of a conventional inorganic luminescent material 400 or a powder of a nanoparticle inorganic luminescent material 400. Another class of suitable inorganic particles is the so-called quantum dot inorganic luminescent material, 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 speaking, 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, semiconductor quantum dots can be composed of several layers of different materials in a core-shell structure. Suitable organic molecules include fluorescent dyes. The phosphor layer may be composed of a mixture of different types of inorganic phosphors 400 in a single layer or multiple layers, each layer containing one or more inorganic phosphors 400. The inorganic phosphor 400 particles in the phosphor layer may have different sizes (eg, diameters) and may be separated.

[0116] In some examples, as shown in Figures 1 and 7, the second region 120 includes at least a first sub-region 121 and a second sub-region 122, the first sub-region 121 is located between the second sub-region 122 and the first region 110, and the light-transmitting protection structure 300 corresponding to at least part of the second light-emitting units 220 in at least the second sub-region 122 is provided with an inorganic light-emitting material 400.

[0117] For example, as shown in Figures 1 and 7 , inorganic luminescent material 400 is disposed within the light-transmitting protective structure 300 corresponding to all second light-emitting units 220 within the second sub-region 122. For example, the second sub-region 122 includes multiple circles of second light-emitting units 220 surrounding the first region 110, and inorganic luminescent material 400 is disposed only within the light-transmitting protective structure 300 corresponding to the second light-emitting units 220 located in the outermost circle. However, the present invention is not limited thereto, and inorganic luminescent material 400 may also be disposed within the light-transmitting protective structure 300 corresponding to the second light-emitting units 220 located at the corners of the second sub-region 122, excluding the second light-emitting units 220 located in the outermost circle.

[0118] 7 schematically illustrates that the inorganic luminescent material 400 is disposed only in the light-transmitting protective structure 300 corresponding to the second light-emitting units 220 in the second sub-region 122, but the present invention is not limited thereto. For example, the inorganic luminescent material 400 may be disposed in the light-transmitting protective structure 300 corresponding to all the second light-emitting units 220 in the second sub-region 122, while the inorganic luminescent material 400 is also disposed in the light-transmitting protective structure 300 corresponding to at least some of the second light-emitting units 220 in the first sub-region 121 that are adjacent to the second sub-region 122. For example, the inorganic luminescent material 400 may be disposed in the light-transmitting protective structure 300 corresponding to all the second light-emitting units 220 in the second region 120.

[0119] FIG8 is a partial cross-sectional view of another embodiment of the present disclosure taken along line AA′ in FIG1 . The difference between the light-emitting substrate shown in FIG8 and the light-emitting substrate shown in FIG7 lies in the arrangement of the inorganic light-emitting material 400 .

[0120] In some examples, as shown in FIG8 , the concentration of the inorganic luminescent material 400 disposed within at least one light-transmitting protective structure 300 in the second sub-region 122 is greater than the concentration of the inorganic luminescent material 400 disposed within at least one light-transmitting protective structure 300 in the first sub-region 121. The concentration of the inorganic luminescent material 400 in different sub-regions in the second region 120 can be adjusted to better address the bluish tint at the edge of the luminescent substrate.

[0121] For example, as shown in FIG8 , the distribution density of the inorganic luminescent material 400 disposed in at least one light-transmitting protection structure 300 in the second sub-region 122 is greater than the distribution density of the inorganic luminescent material 400 disposed in at least one light-transmitting protection structure 300 in the first sub-region 121 .

[0122] For example, as shown in FIG8 , the concentration of the inorganic luminescent material 400 disposed in any light-transmitting protective structure 300 in the second sub-region 122 is greater than the concentration of the inorganic luminescent material 400 disposed in any light-transmitting protective structure 300 in the first sub-region 121. For example, the light-transmitting protective structure 300 in the first sub-region 121 is provided with the inorganic luminescent material 400 only at the light-emitting side, while the light-transmitting protective structure 300 in the second sub-region 122 is uniformly provided with the inorganic luminescent material 400.

[0123] FIG9 is a schematic diagram of a planar structure of a light-emitting substrate provided according to another example of an embodiment of the present disclosure. The light-emitting substrate shown in FIG9 differs from the light-emitting substrate shown in FIG1 in that the light intensity of the first light-emitting unit 210 is less than the light intensity of the second light-emitting unit 220, and the arrangement of the light-emitting units 200 is different. The substrate 01, the position of the first region 110, the position of the second region 120, the reflective layer 600, the light-conversion layer 500, the light-transmitting protective structure 300, and the inorganic light-emitting material 400 in the light-transmitting protective structure 300 in the light-emitting substrate shown in FIG9 may have the same features as the corresponding structures in the light-emitting substrate shown in FIG1 and will not be further described here.

[0124] In some examples, as shown in FIG9 , the light intensity of the first light emitting unit 210 is less than the light intensity of the second light emitting unit 220 , the plurality of light emitting units 200 are arranged in an array, and the plurality of light emitting units 200 are arranged at equal intervals in at least one arrangement direction.

[0125] 9 , the plurality of light emitting units 200 are evenly arranged along the X and Y directions. For example, the distance between adjacent first light emitting units 210 is equal to the distance between adjacent second light emitting units 220 .

[0126] Fig. 10 is a schematic block diagram of a backlight source according to another embodiment of the present disclosure. As shown in Fig. 10 , a backlight source 1001 includes a light-emitting substrate 1000 in any of the above examples.

[0127] For example, as shown in FIG10 , the backlight further includes a light diffusion structure located on the light-emitting side of the light-emitting substrate 1000. For example, the light diffusion structure may include at least one light diffusion layer. For example, the light diffusion structure 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.

[0128] For example, the backlight source may further include layers such as a diffusion layer and a brightness enhancement film. For example, the diffusion layer, the brightness enhancement film, and the light conversion layer 500 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 focuses light and increases the brightness of light emitted from a normal viewing angle.

[0129] FIG11 is a partial cross-sectional view of a display device according to another embodiment of the present disclosure. As shown in FIG11 , the display device includes the light-emitting substrate 1000 of any of the above examples. For example, as shown in FIG11 , the display device may include the backlight source shown in FIG10 .

[0130] For example, as shown in FIG11 , the display device further includes a display panel 2000 stacked with a light-emitting substrate 1000. For example, the display panel 2000 is located on the light-emitting side of the light-emitting substrate 1000, and the light-emitting substrate 1000 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.

[0131] 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.

[0132] 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.

[0133] There are a few points to note:

[0134] (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.

[0135] (2) In the absence of conflict, features in the same embodiment and different embodiments of the present disclosure may be combined with each other.

[0136] 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, comprising at least a first region and a second region, wherein the first region includes a center of the substrate and the second region is located at an edge of the substrate; A plurality of light-emitting units are located on the substrate; Among them, the multiple light-emitting units include at least multiple first light-emitting units and multiple second light-emitting units, the multiple first light-emitting units are located in the first area, the multiple second light-emitting units are located in the second area, the distance between at least two adjacent first light-emitting units is greater than the distance between at least two adjacent second light-emitting units, or the light intensity of the first light-emitting unit is less than the light intensity of the second light-emitting unit.

2. The light-emitting substrate according to claim 1, wherein: The ratio of the illumination at any point in the second area to the illumination at any point in the first area is 0.6-1.

3. The light-emitting substrate according to claim 1 or 2, wherein: The second area surrounds the first area, and a minimum distance between an edge of the second area close to the center of the substrate and an edge of the light-emitting area of ​​the light-emitting substrate is no more than 30 mm.

4. The light-emitting substrate according to any one of claims 1 to 3, wherein: The edge of the first area is connected to the edge of the second area, the multiple first light-emitting units in the first area are arranged at equal intervals, and at least part of the multiple second light-emitting units in the second area are arranged at non-equal intervals.

5. The light-emitting substrate according to claim 4, wherein: The second region includes at least a first sub-region and a second sub-region, the first sub-region is located between the second sub-region and the first region, and the distance between at least two adjacent second light-emitting units in the second sub-region is smaller than the distance between at least two adjacent second light-emitting units in the first sub-region.

6. The light emitting substrate according to claim 5, wherein: The shape of the first area is a quadrilateral, and the multiple light-emitting units are arranged in an array along a direction parallel to a first side and a second side connected to each other of the quadrilateral, and the distance between the second light-emitting units gradually decreases along a direction from the center of the substrate to the edge and parallel to at least one of the first side and the second side.

7. The light-emitting substrate according to any one of claims 1 to 4, further comprising: A plurality of light-transmitting protective structures are arranged one by one corresponding to the plurality of light-emitting units and wrap the portions of the plurality of light-emitting units except those in contact with the substrate, The light-transmitting protective structure corresponding to the second light-emitting unit in at least a portion of the second region is provided with an inorganic light-emitting material, and at least a portion of the second region includes The area farthest from the center of the substrate.

8. The light-emitting substrate according to claim 7, wherein: The second region at least includes a first sub-region and a second sub-region, the first sub-region is located between the second sub-region and the first region, and the light-transmitting protection structure corresponding to at least part of the second light-emitting units in at least the second sub-region is provided with the inorganic light-emitting material.

9. The light emitting substrate according to claim 8, wherein: The concentration of the inorganic luminescent material disposed in at least one of the light-transmitting protection structures in the second sub-region is greater than the concentration of the inorganic luminescent material disposed in at least one of the light-transmitting protection structures in the first sub-region.

10. The light-emitting substrate according to any one of claims 7 to 9, further comprising: a light conversion layer, located on a side of the plurality of light-transmitting protection structures away from the substrate, The plurality of light emitting units emit blue light, the light conversion layer is configured to convert the blue light emitted by the plurality of light emitting units into white light, and the inorganic light emitting material is configured to convert the blue light emitted by the second light emitting unit into white light.

11. The light emitting substrate according to claim 10, wherein: The light conversion layer includes at least one of a quantum dot material and a fluorescent material.

12. The light emitting substrate according to claim 1, wherein: The light intensity of the first light emitting unit is smaller than the light intensity of the second light emitting unit. The plurality of light emitting units are arranged in an array, and the plurality of light emitting units are arranged at equal intervals in at least one arrangement direction.

13. The light-emitting substrate according to any one of claims 1 to 12, further comprising: a reflective layer, located on a side of the substrate where the plurality of light-emitting units are disposed, Wherein, the reflective layer includes a plurality of openings, and the plurality of openings are arranged in one-to-one correspondence with the plurality of light-emitting units.

14. The light-emitting substrate according to any one of claims 7 to 11, 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%.

15. The light-emitting substrate according to any one of claims 1 to 14, 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.

16. A backlight source, comprising the light-emitting substrate according to any one of claims 1 to 15.

17. A display device, comprising the light-emitting substrate according to any one of claims 1 to 15.

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