Direct type backlight module and display device

Abstract

The application discloses a direct type backlight module and a display device. The direct type backlight module comprises a substrate, a light-emitting layer and a diffusion layer. The light-emitting layer comprises a plurality of array-distributed repeating units. Each repeating unit comprises a plurality of light-emitting units and a plurality of fluorescent beads. The light-emitting units and the fluorescent beads are arranged on one surface of the substrate. The plurality of light-emitting units are non-array-distributed on the surface of the substrate and are arranged at intervals. The light-emitting units are prismatic and emit light from the side. The light-emitting units far from the surface of the substrate do not emit light. The fluorescent beads are located between the plurality of light-emitting units and / or between the light-emitting units and the outer contour of the repeating unit. The surface of the fluorescent beads is provided with a diffuse reflection coating. The diffusion layer is arranged on the side of the light-emitting layer far from the substrate and covers the plurality of repeating units. Through the arrangement, the problem of insufficient light-emitting area and uneven light emission of the light-emitting units of the backlight module in the prior art is effectively solved.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a direct-lit backlight module and display device. Background Technology

[0002] Currently, HDR LCD displays on the market typically use direct-lit backlight modules, which employ mini / micro LEDs arranged in a matrix to achieve ultra-high contrast / brightness dynamic display effects through local dimming.

[0003] However, existing technologies, due to the matrix arrangement of LEDs and the fact that most LEDs are top-emitting, create a grid of alternating bright and dark areas, resulting in uneven light emission, insufficient emitting area, and matrix-distributed bright spots that negatively impact visual effects. Current technologies typically cover the light-emitting surface of the backlight module with a high-haze diffusion film to diffuse the light and mitigate this brightness difference. However, the diffusion effect is poor, the brightness difference remains unresolved, and the high-haze diffusion film significantly reduces display brightness. Furthermore, existing side-emitting LEDs also suffer from the problem of uneven matrix-distributed brightness. Summary of the Invention

[0004] This application provides a direct-lit backlight module and display device to solve the problems of insufficient LED light-emitting area and uneven light emission in the prior art.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a direct-lit backlight module for providing backlight for a display panel, comprising:

[0006] Base;

[0007] A light-emitting layer includes multiple repeating units arranged in an array; each repeating unit includes multiple light-emitting units and multiple fluorescent beads, the light-emitting units and the fluorescent beads being disposed on one surface of the substrate; the multiple light-emitting units are non-arrayed on the surface of the substrate and are spaced apart from each other; the light-emitting units are prismatic and emit light from their sides, and the surfaces of the light-emitting units away from the substrate do not emit light; the fluorescent beads are located between the multiple light-emitting units and / or between the light-emitting units and the outer contours of the repeating units; the surface of the fluorescent beads is provided with a diffuse reflection coating;

[0008] A diffusion layer is disposed on the side of the light-emitting layer away from the substrate; the diffusion layer covers a plurality of the repeating units.

[0009] Each side of the light-emitting unit is provided with an LED element, and the LED elements on adjacent sides are of different colors. Along the circumference of the light-emitting unit, the colors of the LED elements are distributed in the order of red, green, and blue; or

[0010] The LED elements on two adjacent sides are the same color, and the LED elements are all white.

[0011] The fluorescent beads include a first fluorescent bead, which is located between two adjacent light-emitting units and is equidistant from the two adjacent light-emitting units; the first fluorescent bead includes a transparent matrix and a diffuse reflection coating, the diffuse reflection coating being disposed on the surface of the transparent matrix; and / or

[0012] The fluorescent bead includes a second fluorescent bead located between the outer contour of the repeating unit and the light-emitting unit; the second fluorescent bead includes a transparent matrix, a fluorescent material, and the diffuse reflection coating, wherein the fluorescent material is disposed inside the transparent matrix; the LED elements on two adjacent sides are of different colors, and the second fluorescent bead is disposed at the connection position of two adjacent sides of the light-emitting unit, wherein the color of the fluorescent material is different from the color of the LED elements on the two sides corresponding to the second fluorescent bead.

[0013] Wherein, the repeating unit is a centrally symmetric pattern; the repeating unit includes a first light-emitting unit, multiple second light-emitting units, and multiple third light-emitting units; the first light-emitting unit is located at the center of the repeating unit; the multiple second light-emitting units are arranged in a cross shape and are symmetrical about the center of the repeating unit; the multiple third light-emitting units are arranged in an X shape and are symmetrical about the center of the repeating unit; or

[0014] The repeating unit includes only a plurality of second light-emitting units and a plurality of third light-emitting units. The plurality of second light-emitting units are arranged in a cross shape and are symmetrical about the center of the repeating unit. The plurality of third light-emitting units are arranged in an X shape and are symmetrical about the center of the repeating unit.

[0015] The outer contour of the repeating unit is square; the repeating unit includes a first light-emitting unit, four second light-emitting units and four third light-emitting units; the four second light-emitting units are respectively disposed on the four sides of the repeating unit close to the first light-emitting unit and located on the midline of the repeating unit; the four third light-emitting units are respectively disposed at the four inner corners of the repeating unit and located on the diagonal of the repeating unit.

[0016] The first light-emitting unit, the second light-emitting unit, and the third light-emitting unit all have square cross-sectional shapes. The second light-emitting unit and the third light-emitting unit have the same size, and the first light-emitting unit has a larger size than the second light-emitting unit.

[0017] The two diagonals of the first light-emitting unit coincide with the two median lines of the repeating unit; the two median lines of the second light-emitting unit correspond to the two intersecting sides of the repeating unit; the two diagonals of the third light-emitting unit correspond to the two intersecting sides of the repeating unit; one median line of the second light-emitting unit coincides with one diagonal line of the two third light-emitting units located on its two sides.

[0018] The repeating unit further includes eight first fluorescent beads and sixteen second fluorescent beads. The first fluorescent beads are positioned at the apex of the second light-emitting unit on the side closer to the first light-emitting unit. The second fluorescent beads are positioned at the apex of the second light-emitting unit and the third light-emitting unit on the side farther from the first light-emitting unit.

[0019] The first light-emitting unit has a regular hexagonal cross-section, the second light-emitting unit has a square cross-section, and the third light-emitting unit has an equilateral triangle cross-section. The size of the first light-emitting unit is larger than that of the second light-emitting unit, and the size of the second light-emitting unit is larger than that of the third light-emitting unit. The diagonal of the second light-emitting unit is parallel to the median line of the repeating unit.

[0020] The repeating unit further includes four first fluorescent beads, which are disposed between the first light-emitting unit and the second and third light-emitting units; the first fluorescent beads are disposed at the apex position of the third light-emitting unit on the side closer to the first light-emitting unit.

[0021] The repeating unit has a square outer contour; it includes one first light-emitting unit, four second light-emitting units, and eight third light-emitting units; the first light-emitting unit has a regular hexagonal cross-section, and the second and third light-emitting units have equilateral triangular cross-sections; the first light-emitting unit is larger than the second light-emitting unit, and the second and third light-emitting units are equal in size; two third light-emitting units are provided at each interior corner of the repeating unit, and one of the apex corners of the two third light-emitting units located at the same interior corner abuts against each other, and the two third light-emitting units are symmetrical about the abutment position.

[0022] The repeating unit further includes eight second fluorescent beads, which are disposed between the outer contour of the repeating unit and the second and third light-emitting units; the second fluorescent beads are disposed on the side of the second light-emitting unit away from the first light-emitting unit.

[0023] The repeating unit has a square outer contour. It includes four second light-emitting units and eight third light-emitting units. The cross-sectional shape of both the second and third light-emitting units is an equilateral triangle, and their dimensions are equal. The second light-emitting units are positioned on the midline of the repeating unit. The third light-emitting units are positioned on the diagonals of the repeating unit. Two third light-emitting units are positioned at each interior corner of the repeating unit, with the two units at the same interior corner spaced apart and symmetrically arranged about the diagonal axis of the repeating unit.

[0024] The repeating unit further includes a first fluorescent bead and eight second fluorescent beads. The first fluorescent bead is disposed at the center of the repeating unit, and the second fluorescent beads are disposed at positions corresponding to the second and third light-emitting units and the outer contour of the repeating unit.

[0025] The light-emitting unit has a filling layer on its surface away from the substrate, and the filling layer is made of a heat-dissipating material or a reflective material; the fluorescent beads are hemispherical or cylindrical in shape; and the haze of the diffusion layer is 15%-25%.

[0026] To solve the above-mentioned technical problems, another technical solution adopted in this application is: to provide a display device, comprising:

[0027] Display panel;

[0028] A direct-lit backlight module is disposed on the light-incident side of the display panel, and the direct-lit backlight module includes any of the direct-lit backlight modules described above.

[0029] The beneficial effects of this application are as follows: Unlike the prior art, this application discloses a direct-lit backlight module and display device. The direct-lit backlight module includes a substrate, a light-emitting layer, and a diffusion layer. The light-emitting layer includes multiple arrayed repeating units. Each repeating unit includes multiple light-emitting units and multiple phosphor beads. The light-emitting units and phosphor beads are disposed on one surface of the substrate. The multiple light-emitting units are non-arrayed on the surface of the substrate and are spaced apart from each other. The light-emitting units are prismatic and emit light from the side. The surfaces of the light-emitting units away from the substrate do not emit light. The phosphor beads are located between the multiple light-emitting units and / or between the light-emitting units and the outer contours of the repeating units. The surface of the phosphor beads is provided with a diffuse reflection coating. The diffusion layer is disposed on the side of the light-emitting layer away from the substrate and covers the multiple repeating units. With the above configuration, the multiple light-emitting units of the repeating unit are not distributed in an array. The light-emitting units are set as side-emitting structures, which can effectively increase the light-emitting area of ​​the light-emitting units. Furthermore, by setting fluorescent beads with diffuse reflection coatings on their surfaces between the multiple light-emitting units and / or between the light-emitting units and the outer contours of the repeating unit, the light emitted from the sides of the light-emitting units is scattered by the diffuse reflection coatings. This effectively solves the problems of insufficient light emission at the gaps between multiple light-emitting units and at the edges of the repeating units, improves the uniformity of light emission in the direct-lit backlight module, and effectively solves the problems of insufficient light emission area and uneven light emission in the light-emitting units of the backlight module in the prior art. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0031] Figure 1 This is a cross-sectional schematic diagram of the direct-lit backlight module provided in this application;

[0032] Figure 2 yes Figure 1 A top view of the repeating unit of the light-emitting layer in the provided direct-lit backlight module, according to a first embodiment;

[0033] Figure 3 yes Figure 2 A top view of the structure of one embodiment of the provided repeating unit;

[0034] Figure 4 yes Figure 1 A top view of the repeating unit of the light-emitting layer in the provided direct-lit backlight module, according to a second embodiment.

[0035] Figure 5 yes Figure 4A schematic diagram of the structure of the first light-emitting unit of the provided repeating unit;

[0036] Figure 6 yes Figure 4 A schematic diagram of the structure of the third light-emitting unit of the provided repeating unit;

[0037] Figure 7 yes Figure 4 A top view of the structure of one embodiment of the provided repeating unit;

[0038] Figure 8 yes Figure 1 A top view of the repeating unit of the light-emitting layer in the provided direct-lit backlight module, according to a third embodiment;

[0039] Figure 9 yes Figure 8 A top view of the structure of one embodiment of the provided repeating unit;

[0040] Figure 10 yes Figure 1 A top view of the repeating unit of the light-emitting layer in the provided direct-lit backlight module, according to a fourth embodiment;

[0041] Figure 11 yes Figure 10 A top view of the structure of one embodiment of the provided repeating unit;

[0042] Figure 12 This is a schematic diagram of the display device provided in this application.

[0043] Icon labels:

[0044] Display device 300; display panel 200; direct-lit backlight module 100; substrate 1; light-emitting layer 2; repeating unit 20; light-emitting unit 21; first light-emitting unit 211; second light-emitting unit 212; third light-emitting unit 213; fluorescent bead 22; first fluorescent bead 221; second fluorescent bead 222; LED element 23; transparent matrix 24; diffuse reflection coating 25; diffusion layer 3. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0046] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0047] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0048] See Figures 1 to 3 , Figure 1 This is a cross-sectional schematic diagram of the direct-lit backlight module provided in this application. Figure 2 yes Figure 1 A top view of the repeating unit of the light-emitting layer in the provided direct-lit backlight module, according to a first embodiment. Figure 3 yes Figure 2 A top view of one embodiment of the provided repeating unit.

[0049] See Figure 1 This application provides a direct-lit backlight module 100 for providing backlight for a display panel 200. The direct-lit backlight module 100 includes a substrate 1, a light-emitting layer 2, and a diffusion layer 3. The light-emitting layer 2 includes a plurality of arrayed repeating units 20. Each repeating unit 20 includes a plurality of light-emitting units 21 and a plurality of phosphor beads 22. The light-emitting units 21 and phosphor beads 22 are disposed on one surface of the substrate 1. The plurality of light-emitting units 21 are not arrayed on the surface of the substrate 1 and are spaced apart from each other. The light-emitting units 21 are prismatic and emit light from the sides. The surfaces of the light-emitting units 21 away from the substrate 1 do not emit light. The phosphor beads 22 are located between the plurality of light-emitting units 21 and / or between the light-emitting units 21 and the outer contours of the repeating units 20. The surface of the phosphor beads 22 is provided with a diffuse reflection coating 25. The diffusion layer 3 is disposed on the side of the light-emitting layer 2 away from the substrate 1 and covers the plurality of repeating units 20 of the light-emitting layer 2.

[0050] It is understood that, compared to the top-emitting LED structure in the prior art, in this embodiment, the multiple light-emitting units 21 in the repeating unit 20 are not distributed in an array, and the light-emitting units 21 are set as side-emitting structures. The cross-sectional shape of the light-emitting units 21 is polygonal. The multiple sides of the light-emitting units 21 emit light, resulting in more light-emitting surfaces and a larger light-emitting area. This is beneficial to increasing the light-emitting area in the light-emitting layer 2 of the direct-lit backlight module 100, resulting in higher brightness and stronger light. This effectively solves the problem of uneven matrix brightness and darkness distribution caused by the array distribution of light-emitting units 21 in the prior art. Furthermore, by setting fluorescent beads 22 with diffuse reflection coating 25 on their surfaces between the multiple light-emitting units 21 and / or between the light-emitting units 21 and the outer contour of the repeating unit 20, the diffuse reflection coating 25 of the fluorescent beads 22 scatters the light emitted from the sides of the light-emitting units 21. This effectively solves the problems of insufficient light emission and uneven light emission at the gaps between the multiple light-emitting units 21 and at the edges of the repeating unit 20, thereby improving the light emission uniformity of the direct-lit backlight module 100 and effectively solving the problems of insufficient light emission area and uneven light emission of the light-emitting units 21 in the prior art.

[0051] Specifically, the light-emitting unit 21 is prism-shaped with a polygonal cross-section and rectangular side surfaces. Each light-emitting unit 21 has an LED element 23 on its side surface, which is used to emit light. Compared with the top-emitting light-emitting unit in the prior art, in this embodiment, the light-emitting unit 21 emits light from the side, and the cross-sectional shape of the light-emitting unit 21 is polygonal. This allows the light-emitting area of ​​the light-emitting layer 2 to be increased by 200%-300%, resulting in a larger light-emitting area, better light emission effect, and higher brightness.

[0052] In some embodiments, the LED elements 23 on adjacent sides of the light-emitting unit 21 can be of different colors. For example, along the circumference of the light-emitting unit 21, the colors of the LED elements 23 on multiple sides are distributed in the order of red, green, and blue, so that the multiple light-emitting units 21 in the repeating unit 20 can emit light of the three primary colors: red, green, and blue. The red, green, and blue light emitted by the multiple light-emitting units 21 can be mixed to form white light, allowing the direct-lit backlight module 100 to provide uniform white backlight to the display panel 200. In other embodiments, the LED elements 23 on adjacent sides of the light-emitting unit 21 are of the same color, and the LED elements 23 on each side of the light-emitting unit 21 are white, so that the light-emitting unit 21 directly emits white light without the need for mixing multiple colors of light to form white light. The direct-lit backlight module 100 directly provides white backlight to the display panel 200. It is understandable that, compared to the prior art where the LED element 23 is set as a blue LED and a light conversion layer containing quantum dots and other structures is set on the side of the light-emitting unit 21 away from the substrate 1 to convert blue light into white light, thereby providing white backlight for the display panel 200, in this embodiment, the color of the LED element 23 on the side of the light-emitting unit 21 is set to the three primary colors of red, green and blue to mix colors to form white light, or the color of the LED element 23 is directly set to white to directly emit white light. There is no need to set a light conversion layer in the backlight module, which simplifies the structure of the direct-lit backlight module 100 and saves production costs.

[0053] The surface of the light-emitting unit 21 away from the substrate 1 does not emit light, which is more conducive to achieving uniformity of brightness and light in the light-emitting layer 2. Specifically, the surface of the light-emitting unit 21 away from the substrate 1 can be a white material layer, or a filling layer can be provided on the surface of the light-emitting unit 21 away from the substrate 1. The material of the filling layer can be a heat-dissipating material to achieve better heat dissipation and improve the heat dissipation performance of the direct-lit backlight module 100; or the material of the filling layer can also be a reflective material to reflect the light shining on it, making the light distribution more uniform and achieving better brightness uniformity. Multiple light-emitting units 21 are spaced apart, and the size of the light-emitting unit 21 is positively correlated with the distance between two adjacent light-emitting units 21. The larger the size of the light-emitting unit 21, the larger the distance between two adjacent light-emitting units 21. There is a certain proportional relationship between the size of the light-emitting unit 21 and the distance between two adjacent light-emitting units 21. For example, the ratio of the size of the light-emitting unit 21 to the distance between two adjacent light-emitting units 21 can be any value such as 1 / 2, 1 / 1.5, 1 / 1.8, etc. An appropriate ratio can be selected as needed to achieve better brightness distribution.

[0054] In some implementations, such as Figure 1As shown, the fluorescent beads 22 within the repeating unit 20 may include a first fluorescent bead 221, which is located between two adjacent light-emitting units 21 and is equidistant from them. Specifically, the first fluorescent bead 221 includes a transparent substrate 24 and a diffuse reflection coating 25, which is disposed on the surface of the transparent substrate 24. It is understood that by setting a first fluorescent bead 221 between the light-emitting units 21 and providing a diffuse reflection coating 25 on the surface of the first fluorescent bead 221, the diffuse reflection coating 25 on the surface of the first fluorescent bead 221 can scatter the light emitted by the LED element 23 on the side of the light-emitting unit 21, supplementing the light at the gap between two adjacent light-emitting units 21, further increasing the light-emitting area in the light-emitting layer 2, which can effectively solve the problem of insufficient light at the gap between two adjacent light-emitting units 21. The first fluorescent bead 221 uniformizes the light in the surface of the light-emitting layer 2, improving the uniformity of the in-plane light of the direct-lit backlight module 100, and further solving the problem of uneven matrix brightness and darkness distribution caused by the array distribution of light-emitting units 21 in the prior art.

[0055] In some implementations, such as Figure 1 As shown, the fluorescent beads 22 within the repeating unit 20 may include second fluorescent beads 222. The second fluorescent beads 222 are disposed between the outer contour of the repeating unit 20 and the light-emitting unit 21, and are spaced apart from both the outer contour of the repeating unit 20 and the light-emitting unit 21. Specifically, the second fluorescent beads 222 include a transparent matrix 24, a fluorescent material (not shown), and a diffuse reflection coating 25. The fluorescent material is disposed inside the transparent matrix 24, and the diffuse reflection coating 25 is disposed on the surface of the transparent matrix 24. The fluorescent material can be a photoluminescent material such as phosphor or quantum dots. When light shines on the second fluorescent beads 222, the second fluorescent beads 222 can emit light, further increasing the light-emitting area of ​​the light-emitting layer 2. The diffuse reflection coating on the surface of the second fluorescent beads 222 can also scatter the light emitted by the LED elements 23 on the side of the light-emitting unit 21 to compensate for insufficient light at the position between the light-emitting unit 21 and the outer contour of the repeating unit 20, solving the problems of insufficient light, uneven light, and low brightness at the edge position of the direct-lit backlight module 100, and further improving the uniformity of light within the surface of the light-emitting layer 2.

[0056] The second fluorescent bead 222 is positioned at the connection point of two adjacent sides of the light-emitting unit 21. When the light emitted by the LED elements 23 on the two adjacent sides of the light-emitting unit 21 is of different colors, the color of the fluorescent material in the transparent matrix 24 is different from the color of the LED elements 23 on the two sides of the second fluorescent bead 222. The second fluorescent bead 222 can absorb part of the light emitted by its corresponding LED element 23 and emit light of a different color than its corresponding LED element 23. This avoids uneven R / G / B color mixing of the light emitted by the LED elements 23 on the side of the light-emitting unit 21 near the outer contour of the repeating unit 20, which would lead to color deviation of the light-emitting unit 21 at the outer contour of the repeating unit 20 and improve in-plane uniformity.

[0057] In some embodiments, the fluorescent beads 22 within the repeating unit 20 may also include both first fluorescent beads 221 and second fluorescent beads 222, with the first fluorescent beads 221 and second fluorescent beads 222 positioned in the same manner as in the two embodiments described above. It is understood that including both first fluorescent beads 221 and second fluorescent beads 222 within the repeating unit 20 can simultaneously supplement the light at the gaps between multiple light-emitting units 21 and at the positions between the light-emitting units 21 and the outer contour of the repeating unit 20. The diffuse reflection coating 25 scatters the light, homogenizing the light in areas with insufficient illumination and further expanding the light-emitting area. Figure 1 As shown in the in-plane brightness distribution curve, the light in the light-emitting layer 2 is more uniform, and the brightness distribution at various positions in the plane is more uniform and consistent. This achieves the design of a direct-lit backlight module 100 with ultra-high brightness and high uniformity, and more effectively solves the problems of insufficient light emission of the light-emitting unit and uneven matrix brightness distribution in the backlight module in the prior art, which is conducive to improving the display effect of the display device 300.

[0058] In this embodiment, the first fluorescent bead 221 and the second fluorescent bead 222 can be shaped as a hemispherical or cylindrical shape. The hemispherical or cylindrical structure can better scatter the light incident upon it. The size of the first fluorescent bead 221 and the second fluorescent bead 222 is smaller than the size of the light-emitting unit 21. The height of the first fluorescent bead 221 and the second fluorescent bead 222 can be equal to the height of the light-emitting unit 21, or slightly larger or smaller than the height of the light-emitting unit 21. In other embodiments, the shape of the first fluorescent bead 221 and the second fluorescent bead 222 can also be any shape such as a prism or pyramid.

[0059] Compared to existing technologies where the haze of the diffusion layer 3 is set to be greater than 70%, using a high-haze diffusion layer 3 to diffuse light and reduce matrix brightness differences, which leads to a significant reduction in display brightness, in this embodiment, since the light-emitting unit 21 is a side-emitting structure and multiple light-emitting units 21 are not distributed in an array, and a first phosphor bead 221 and / or a second phosphor bead 222 are provided to supplement the light at specific positions, making the light distribution more uniform, it is not necessary to set the diffusion layer 3 to a high haze to diffuse the light. The haze of the diffusion layer 3 is in the range of 15%-25%. Using a low-haze diffusion layer 3 can still achieve high light emission uniformity, avoiding the problem of a significant reduction in display brightness caused by using a high-haze diffusion layer 3, and further improving the performance of the direct-lit backlight module 100.

[0060] The overall shape of the repeating unit 20 is a centrally symmetrical figure. The light-emitting unit 21 in the repeating unit 20 may include a first light-emitting unit 211 and / or a second light-emitting unit 212 and / or a third light-emitting unit 213. The first light-emitting unit 211, the second light-emitting unit 212 and the third light-emitting unit 213 differ only in size and shape. For example, the light-emitting unit 21 in the repeating unit 20 includes a first light-emitting unit 211, multiple second light-emitting units 212, and multiple third light-emitting units 213. The first light-emitting unit 211 is located at the center of the repeating unit 20. The multiple second light-emitting units 212 are arranged in a cross shape and are symmetrical about the center of the repeating unit 20. The multiple third light-emitting units 213 are arranged in an X shape and are also symmetrical about the center of the repeating unit 20. The cross-sectional shape of the first light-emitting unit 211, the second light-emitting unit 212, and the third light-emitting unit 213 are all polygonal. Alternatively, the light-emitting unit 21 in the repeating unit 20 may not include the first light-emitting unit 211, but only includes multiple second light-emitting units 212 and multiple third light-emitting units 213. The arrangement of the multiple second light-emitting units 212 and multiple third light-emitting units 213 is the same as the arrangement of the multiple second light-emitting units 212 and multiple third light-emitting units 213 described above. In other embodiments, the light-emitting unit 21 in the repeating unit 20 may include only the first light-emitting unit 211 and a plurality of second light-emitting units 212, or only the first light-emitting unit 211 and a plurality of third light-emitting units 213, wherein the arrangement of the first light-emitting unit 211, the second light-emitting unit 212, and the third light-emitting unit 213 is the same as that in the above embodiments.

[0061] See Figure 2In this embodiment, the outer contour of the repeating unit 20 is square. Specifically, the outer contour of the repeating unit 20 can be a unit square with a size of 1mm × 1mm. The repeating unit 20 includes a first light-emitting unit 211, four second light-emitting units 212 and four third light-emitting units 213. The first light-emitting unit 211 is located at the center of the repeating unit 20. The four second light-emitting units 212 are respectively disposed on the four sides of the repeating unit 20 close to the first light-emitting unit 211 and located on the midline of the repeating unit 20. The four third light-emitting units 213 are respectively disposed at the four inner corners of the repeating unit 20 and located on the diagonal of the repeating unit 20.

[0062] Specifically, such as Figure 2 As shown, the cross-sectional shape of the first light-emitting unit 211, the second light-emitting unit 212, and the third light-emitting unit 213 is square. The second light-emitting unit 212 and the third light-emitting unit 213 are equal in size, the size of the first light-emitting unit 211 is larger than the size of the second light-emitting unit 212, and the heights of the first light-emitting unit 211, the second light-emitting unit 212, and the third light-emitting unit 213 are equal, that is, the surfaces of the first light-emitting unit 211, the second light-emitting unit 212, and the third light-emitting unit 213 that are away from the substrate 1 are flush.

[0063] The two diagonals of the first light-emitting unit 211 coincide with the two midline of the repeating unit 20, the two midline of the second light-emitting unit 212 correspond to the two intersecting sides of the repeating unit 20, the two diagonals of the third light-emitting unit 213 correspond to the two intersecting sides of the repeating unit 20, and one of the midline of the second light-emitting unit 212 coincides with one of the diagonals of the two third light-emitting units 213 located on both sides of it. That is, the side of the second light-emitting unit 212 closer to the third light-emitting unit 213 corresponds to the two sides of the third light-emitting unit 213, and the side of the second light-emitting unit 212 closer to the first light-emitting unit 211 corresponds to the two sides of the first light-emitting unit 211. It is understandable that a larger first light-emitting unit 211 is set at the center of the repeating unit 20, and multiple second light-emitting units 212 are symmetrically arranged about the center of the repeating unit 20, and multiple third light-emitting units 213 are symmetrically arranged about the center of the repeating unit 20. The multiple light-emitting units 21 in the repeating unit 20 are radially distributed rather than arrayed, which can make the light emission in the repeating unit 20 more uniform and avoid the problem of uneven light matrix distribution caused by the light-emitting units 21 being arrayed, thereby improving the performance of the direct-lit backlight module 100.

[0064] like Figure 2As shown, in this embodiment, the repeating unit 20 further includes eight first fluorescent beads 221 and sixteen second fluorescent beads 222. The first fluorescent beads 221 are disposed between the multiple light-emitting units 21, and the second fluorescent beads 222 are disposed between the light-emitting units 21 and the outer contour of the repeating unit 20. The structures of the first fluorescent beads 221 and the second fluorescent beads 222 are the same as those of the first fluorescent beads 221 and the second fluorescent beads 222 described above, and will not be repeated here. Specifically, the first fluorescent bead 221 is positioned at the apex of the second light-emitting unit 212 near the first light-emitting unit 211. The distance between the first fluorescent bead 221 and the adjacent second light-emitting unit 212 and third light-emitting unit 213 is equal to better scatter the light irradiated onto it, resulting in a more uniform light distribution. The second fluorescent bead 222 is positioned at the apex of the second light-emitting unit 212 and third light-emitting unit 213 away from the first light-emitting unit 211. This supplements the light at the position between the second light-emitting unit 212 and third light-emitting unit 213 and the outer contour of the repeating unit 20, thus uniformizing the light within the surface. At the same time, the fluorescent material in the second fluorescent bead 222 can also emit light to prevent uneven R / G / B color mixing of the light emitted by the LED elements 23 on the side of the second light-emitting unit 212 and third light-emitting unit 213 near the outer contour of the repeating unit 20, which could cause color shift. This effectively improves the brightness and uniformity of the light in the direct-lit backlight module 100.

[0065] See Figure 3 In one embodiment, the outer contour of the repeating unit 20 is set to a circle. Specifically, the outer contour of the repeating unit 20 is a unit circle. The specific arrangement of the light-emitting unit 21 and the fluorescent bead 22 within the repeating unit 20 is the same as... Figure 2 The arrangement of the first light-emitting unit 211, the second light-emitting unit 212, and the third light-emitting unit 213, as well as the first fluorescent bead 221 and the second fluorescent bead 222, is the same and will not be described again. In other embodiments, the cross-sectional shape of the first light-emitting unit 211, the second light-emitting unit 212, and the third light-emitting unit 213 can also be set to other arbitrary shapes, and the shape of the outer contour of the repeating unit 20 can also be set to other centrally symmetrical patterns.

[0066] See Figures 4 to 7 , Figure 4 yes Figure 1 A top view of the repeating unit of the light-emitting layer in the provided direct-lit backlight module, according to a second embodiment. Figure 5 yes Figure 4 A schematic diagram of the structure of the first light-emitting unit of the provided repeating unit. Figure 6 yes Figure 4 A schematic diagram of the structure of the third light-emitting unit of the provided repeating unit. Figure 7 yes Figure 4A top view of one embodiment of the provided repeating unit.

[0067] See Figure 4 In this embodiment, the repeating unit 20 is centrally symmetrical, and its outer contour is a unit square. The repeating unit 20 includes one first light-emitting unit 211, four second light-emitting units 212, and four third light-emitting units 213. Figure 5 As shown, the first light-emitting unit 211 is shaped like a regular hexagonal prism, with a cross-sectional shape of a regular hexagon. The LED elements 23 on the sides of the first light-emitting unit 211 are colored in red, green, and blue in sequence. The first light-emitting unit 211 is located at the center of the repeating unit 20. The second light-emitting unit 212 has a square cross-section. The four second light-emitting units 212 are respectively positioned on the four sides of the repeating unit 20, close to the first light-emitting unit 211, and located on the midline of the repeating unit 20. The four second light-emitting units 212 are symmetrically arranged about the center of the repeating unit 20. Figure 6 As shown, the third light-emitting unit 213 is in the shape of a regular triangular prism, and the cross-sectional shape of the third light-emitting unit 213 is an equilateral triangle. The four third light-emitting units 213 are respectively arranged at the four interior corner positions of the repeating unit 20 and are located on the diagonal of the repeating unit 20. The four third light-emitting units 213 are arranged symmetrically about the center of the repeating unit 20.

[0068] Specifically, the size of the first light-emitting unit 211 is larger than the size of the second light-emitting unit 212, and the size of the second light-emitting unit 212 is larger than the size of the third light-emitting unit 213. One diagonal of the two second light-emitting units 212 located on the same midline of the repeating unit 20 coincides with the midline of the repeating unit 20. It can be understood that setting the cross-sectional shape of the first light-emitting unit 211 to a regular hexagon can make the first light-emitting unit 211 have more light-emitting surfaces and a larger light-emitting area, further increasing the light-emitting area of ​​the light-emitting layer 2 and improving brightness. Multiple light-emitting surfaces also make the light distribution in the repeating unit 20 more uniform. At the same time, the colors of the LED elements 23 on the six sides of the regular hexagonal prism are distributed in red, green, and blue in sequence, and the colors of the LED elements 23 on adjacent sides are different. This can further make the R / G / B color mixing in the repeating unit 20 more uniform and the color mixing effect better, further avoiding the problem of color deviation caused by uneven R / G / B color mixing. The multiple light-emitting units 21 in the repeating unit 20 are arranged radially rather than in an array, which makes the in-plane light emission of the repeating unit 20 more uniform. This avoids the problem of uneven light matrix distribution when the light-emitting units 21 are arranged in an array, and improves the performance of the direct-lit backlight module 100.

[0069] In this embodiment, as Figure 4As shown, the repeating unit 20 also includes four first fluorescent beads 221, but not the second fluorescent beads 222. The first fluorescent beads 221 are disposed between the first light-emitting unit 211 and the second light-emitting unit 212 and the third light-emitting unit 213. The structure of the first fluorescent beads 221 is the same as that of the first fluorescent beads 221 in the first embodiment of the repeating unit 20, and will not be described again. Specifically, the four first fluorescent beads 221 are respectively disposed at the apex positions of the four third light-emitting units 213 on the side closest to the first light-emitting unit 211. By setting a first fluorescent bead 221 between the first light-emitting unit 211 and the second light-emitting unit 212 and the third light-emitting unit 213, the diffuse reflection coating 25 on the surface of the first fluorescent bead 221 scatters the light emitted from the sides of the first light-emitting unit 211, the second light-emitting unit 212 and the third light-emitting unit 213, effectively increasing the light-emitting area and supplementing the light at the position of the first fluorescent bead 221, and uniformizing the brightness at that position, so that the light distribution is more uniform, the in-plane brightness is higher and the distribution is more consistent, thus solving the problems of insufficient light emission and uneven light distribution at the gap positions of multiple light-emitting units.

[0070] See Figure 7 In one embodiment, the outer contour of the repeating unit 20 is set to a circle. Specifically, the outer contour of the repeating unit 20 is a unit circle. The specific arrangement of the light-emitting unit 21 and the fluorescent bead 22 within the repeating unit 20 is the same as... Figure 4 The arrangement of the first light-emitting unit 211, the second light-emitting unit 212, the third light-emitting unit 213, and the first fluorescent bead 221 is the same and will not be described again. In other embodiments, the cross-sectional shape of the first light-emitting unit 211, the second light-emitting unit 212, and the third light-emitting unit 213 can also be set to other arbitrary shapes, and the shape of the outer contour of the repeating unit 20 can also be set to other centrally symmetrical patterns.

[0071] See Figures 8 to 9 , Figure 8 yes Figure 1 A top view of the repeating unit of the light-emitting layer in the provided direct-lit backlight module, according to a third embodiment. Figure 9 yes Figure 8 A top view of one embodiment of the provided repeating unit.

[0072] See Figure 8In this embodiment, the repeating unit 20 is centrally symmetrical. The outer contour of the repeating unit 20 is a unit square. The repeating unit 20 includes one first light-emitting unit 211, four second light-emitting units 212, and eight third light-emitting units 213. The cross-sectional shape of the first light-emitting unit 211 is a regular hexagon, while the cross-sectional shapes of the second light-emitting units 212 and the third light-emitting units 213 are both equilateral triangles. The size of the first light-emitting unit 211 is larger than the size of the second light-emitting unit 212, and the size of the second light-emitting unit 212 is equal to the size of the third light-emitting unit 213. Two third light-emitting units 213 are provided at each interior corner of the repeating unit 20. One apex of the two third light-emitting units 213 located at the same interior corner of the repeating unit 20 abuts against each other, and the two third light-emitting units 213 are centrally symmetrical about this abutment position.

[0073] It is understandable that setting the cross-sectional shape of the first light-emitting unit 211 to a regular hexagon allows for more light-emitting surfaces and a larger light-emitting area, further increasing the light-emitting area of ​​the light-emitting layer 2 and improving brightness. Compared to the top-emitting structure in the prior art, in this embodiment, the cross-sectional shape of the second light-emitting unit 212 and the third light-emitting unit 213 is an equilateral triangle, which reduces the space occupied on the substrate 1 and increases the number of light-emitting surfaces and the light-emitting area, resulting in higher luminous efficiency. In this embodiment, the number of third light-emitting units 213 is set to eight, which increases the number of third light-emitting units 213 and their distribution is more uniform, further increasing the light-emitting area and facilitating better brightness distribution. The multiple light-emitting units 21 in the repeating unit 20 are radially distributed rather than arrayed, which also makes the in-plane light emission of the repeating unit 20 more uniform, avoiding the problem of uneven brightness distribution in the light matrix when the light-emitting units 21 are arrayed, and improving the performance of the direct-lit backlight module 100.

[0074] like Figure 8As shown, in this embodiment, the repeating unit 20 further includes eight second fluorescent beads 222, excluding the first fluorescent beads 221. The second fluorescent beads 222 are disposed between the outer contour of the repeating unit 20 and the second light-emitting unit 212 and the third light-emitting unit 213. The structure of the second fluorescent beads 222 is the same as that of the second fluorescent beads 222 in the first embodiment of the repeating unit 20, and will not be described again. Specifically, the second fluorescent beads 222 are disposed on the side of the second light-emitting unit 212 away from the first light-emitting unit 211, to supplement the light at the position between the second light-emitting unit 212 and the third light-emitting unit 213 and the outer contour of the repeating unit 20, and to uniformize the light inside the surface. At the same time, the fluorescent material in the second fluorescent beads 222 can also emit light to prevent the problem of uneven R / G / B color mixing of the light emitted by the LED elements 23 near the outer contour of the repeating unit 20 of the second light-emitting unit 212 and the third light-emitting unit 213 from causing color deviation. This effectively improves the brightness and uniformity of the light of the direct-lit backlight module 100, and achieves higher brightness display and high uniformity of brightness distribution.

[0075] See Figure 9 In one embodiment, the outer contour of the repeating unit 20 is approximately square. Specifically, the outer contour of the repeating unit 20 is approximately a unit square, with the four vertices of the square being concave and rounded towards the center of the repeating unit 20. The shape of the outer contour of the repeating unit 20 is symmetrical about the center of the repeating unit 20. The specific arrangement of the light-emitting unit 21 and the fluorescent beads 22 within the repeating unit 20 is similar to... Figure 8 The arrangement of the first light-emitting unit 211, the second light-emitting unit 212, the third light-emitting unit 213, and the second fluorescent bead 222 is the same and will not be described again. In other embodiments, the cross-sectional shape of the first light-emitting unit 211, the second light-emitting unit 212, and the third light-emitting unit 213 can also be set to other arbitrary shapes, and the shape of the outer contour of the repeating unit 20 can also be set to a circle or other centrally symmetrical shape.

[0076] See Figures 10 to 11 , Figure 10 yes Figure 1 A top view of the repeating unit of the light-emitting layer in the provided direct-lit backlight module, according to a fourth embodiment. Figure 11 yes Figure 10 A top view of one embodiment of the provided repeating unit.

[0077] See Figure 10In this embodiment, the repeating unit 20 is centrally symmetrical, with an outer contour of a unit square. The repeating unit 20 includes four second light-emitting units 212 and eight third light-emitting units 213, excluding the first light-emitting unit 211. The cross-sectional shape of both the second and third light-emitting units 212 and 213 is an equilateral triangle, and their dimensions are equal. Specifically, the four second light-emitting units 212 are arranged in a cross shape, positioned on the midline of the repeating unit 20, and are centrally symmetrical about the repeating unit 20. The eight third light-emitting units 213 are arranged in an X-shape, positioned on the diagonals of the repeating unit 20, and are centrally symmetrical about the repeating unit 20. Two third light-emitting units 213 are located at each interior corner of the repeating unit 20, with the two units at the same interior corner spaced apart and symmetrical about the diagonal axis of the repeating unit 20. Setting the cross-sectional shape of both the second light-emitting unit 212 and the third light-emitting unit 213 to a triangle can make the distribution of the second light-emitting unit 212 and the third light-emitting unit 213 within the repeating unit 20 more uniform, and the in-plane light distribution more uniform, which is beneficial to improving the uniformity of the in-plane light.

[0078] like Figure 10 As shown, in this embodiment, the repeating unit 20 further includes a first fluorescent bead 221 and eight second fluorescent beads 222. The first fluorescent bead 221 is disposed at the center of the repeating unit 20. The diffuse reflection coating 25 on the surface of the first fluorescent bead 221 scatters the light emitted from the sides of the second light-emitting unit 212 and the third light-emitting unit 213 to supplement the light at the center of the repeating unit 20, thereby avoiding the problems of insufficient light or uneven light distribution at the center. The second fluorescent bead 222 is disposed between the second light-emitting unit 212 and the third light-emitting unit 213 and the outer contour of the repeating unit 20. Specifically, the second fluorescent bead 222 is disposed on the two sides of the second light-emitting unit 212 near the center of the repeating unit 20, and the spacing between the second fluorescent bead 222 and the adjacent second light-emitting unit 212 and third light-emitting unit 213 is equal, so that the second fluorescent bead 222 can better scatter light, making the light distribution more uniform at the position between the second light-emitting unit 212 and the third light-emitting unit 213 and the outer contour of the repeating unit 20. The second fluorescent bead 222 can also effectively prevent the problem of color shift caused by uneven R / G / B color mixing of the light emitting unit 21 near the outer contour of the repeating unit 20. This effectively improves the brightness and uniformity of the in-plane brightness distribution of the direct-lit backlight module 100, and improves the performance of the direct-lit backlight module 100.

[0079] See Figure 11In one embodiment, the outer contour of the repeating unit 20 is approximately square. Specifically, the outer contour of the repeating unit 20 is approximately a unit square, with the four vertices of the square being concave and rounded towards the center of the repeating unit 20. The shape of the outer contour of the repeating unit 20 is symmetrical about the center of the repeating unit 20. The specific arrangement of the light-emitting unit 21 and the fluorescent beads 22 within the repeating unit 20 is similar to... Figure 10 The second light-emitting unit 212 and the third light-emitting unit 213, as well as the first fluorescent bead 221 and the second fluorescent bead 222, are arranged in the same way and will not be described again. In other embodiments, the cross-sectional shape of the second light-emitting unit 212 and the third light-emitting unit 213 can also be set to other arbitrary shapes, and the shape of the outer contour of the repeating unit 20 can also be set to a circle or other arbitrary centrally symmetrical shape.

[0080] The direct-lit backlight module 100 provided in this application can effectively solve the problems of insufficient light-emitting area and uneven light emission of the light-emitting unit in the prior art. It is beneficial to improve the uniformity of the in-plane light distribution of the direct-lit backlight module 100, realize the design of the direct-lit backlight module 100 with ultra-high brightness and high uniformity, and thus improve the performance of the direct-lit backlight module 100.

[0081] See Figure 12 , Figure 12 This is a schematic diagram of the display device provided in this application.

[0082] See Figure 12 This application also provides a display device 300, which includes a display panel 200 and a direct-lit backlight module 100. The display panel 200 is used to realize the image display function. The display panel 200 can be a liquid crystal display panel 200. The direct-lit backlight module 100 is disposed on the light-incident side of the display panel 200 and is used to provide backlight for the display panel 200. Specifically, the direct-lit backlight module 100 can be any of the direct-lit backlight modules 100 in the above embodiments. It is understood that by setting the direct-lit backlight module 100 of the display device 300 to the direct-lit backlight module 100 in any of the above embodiments, the in-plane light distribution of the direct-lit backlight module 100 can be more uniform, the light at each position is more uniform, and the brightness distribution is more balanced. This allows the direct-lit backlight module 100 to provide more uniform backlight to the display panel 200, resulting in higher and more uniform display brightness of the display panel 200. Consequently, the display effect of the display device 300 is better, achieving a higher quality image display function. This effectively solves the problem of uneven brightness distribution in matrix-type displays and improves the display performance of the display device 300.

[0083] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A direct-lit backlight module for providing backlight to a display panel, characterized in that, include: Base; A light-emitting layer includes multiple repeating units arranged in an array; each repeating unit includes multiple light-emitting units and multiple fluorescent beads, the light-emitting units and the fluorescent beads being disposed on one surface of the substrate; the multiple light-emitting units are non-arrayed on the surface of the substrate and are spaced apart from each other; the light-emitting units are prismatic and emit light from their sides, and the surfaces of the light-emitting units away from the substrate do not emit light; the fluorescent beads are located between the multiple light-emitting units and / or between the light-emitting units and the outer contours of the repeating units; the surface of the fluorescent beads is provided with a diffuse reflection coating; A diffusion layer is disposed on the side of the light-emitting layer away from the substrate; the diffusion layer covers a plurality of the repeating units; Each side of the light-emitting unit is provided with an LED element, and the LED elements on adjacent sides are of different colors. Along the circumference of the light-emitting unit, the colors of the LED elements are distributed in the order of red, green, and blue. The fluorescent beads include a first fluorescent bead and a second fluorescent bead, or the fluorescent beads include a second fluorescent bead; the first fluorescent bead is located between two adjacent light-emitting units and is equidistant from the two adjacent light-emitting units; the first fluorescent bead includes a transparent matrix and the diffuse reflection coating, the diffuse reflection coating being disposed on the surface of the transparent matrix; the second fluorescent bead is located between the outer contour of the repeating unit and the light-emitting unit; the second fluorescent bead includes a transparent matrix, a fluorescent material, and the diffuse reflection coating, the fluorescent material being disposed inside the transparent matrix; the second fluorescent bead is disposed at the connection position of two adjacent sides of the light-emitting unit, and the color of the fluorescent material is different from the color of the LED element on the two sides corresponding to the second fluorescent bead.

2. The direct-lit backlight module according to claim 1, characterized in that, The surface of the light-emitting unit away from the substrate is provided with a filling layer, the material of which is a heat-dissipating material or a reflective material; the shape of the fluorescent bead is hemispherical or cylindrical; the haze of the diffusion layer is 15%-25%.

3. The direct-lit backlight module according to claim 1, characterized in that, The repeating unit is a centrally symmetrical pattern; the repeating unit includes a first light-emitting unit, multiple second light-emitting units, and multiple third light-emitting units; the first light-emitting unit is located at the center of the repeating unit; the multiple second light-emitting units are arranged in a cross shape and are symmetrical about the center of the repeating unit; the multiple third light-emitting units are arranged in an X shape and are symmetrical about the center of the repeating unit; or The repeating unit includes only a plurality of second light-emitting units and a plurality of third light-emitting units. The plurality of second light-emitting units are arranged in a cross shape and are symmetrical about the center of the repeating unit. The plurality of third light-emitting units are arranged in an X shape and are symmetrical about the center of the repeating unit.

4. The direct-lit backlight module according to claim 3, characterized in that, The outer contour of the repeating unit is square; the repeating unit includes one first light-emitting unit, four second light-emitting units, and four third light-emitting units; the cross-sectional shape of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit are all square, the second light-emitting unit and the third light-emitting unit are equal in size, and the size of the first light-emitting unit is larger than the size of the second light-emitting unit; The two diagonals of the first light-emitting unit coincide with the two median lines of the repeating unit; the four second light-emitting units are respectively disposed on the four sides of the repeating unit, close to the first light-emitting unit and located on the median line of the repeating unit, and the two median lines of the second light-emitting units are respectively parallel to the two intersecting sides of the repeating unit; the four third light-emitting units are respectively disposed at the four interior corners of the repeating unit and located on the diagonals of the repeating unit, and the two diagonals of the third light-emitting units are respectively parallel to the two intersecting sides of the repeating unit; one median line of the second light-emitting unit coincides with one diagonal line of the two third light-emitting units located on its two sides. The repeating unit further includes eight first fluorescent beads and sixteen second fluorescent beads. The first fluorescent beads are positioned at the apex of the second light-emitting unit on the side closer to the first light-emitting unit. The second fluorescent beads are positioned at the apex of the second light-emitting unit and the third light-emitting unit on the side farther from the first light-emitting unit.

5. The direct-lit backlight module according to claim 3, characterized in that, The outer contour of the repeating unit is square; the repeating unit includes one first light-emitting unit, four second light-emitting units, and eight third light-emitting units; the cross-sectional shape of the first light-emitting unit is a regular hexagon, and the cross-sectional shapes of the second and third light-emitting units are equilateral triangles; the size of the first light-emitting unit is larger than the size of the second light-emitting unit, and the size of the second light-emitting unit is equal to the size of the third light-emitting unit; two third light-emitting units are provided at each interior corner of the repeating unit, and one of the apex corners of the two third light-emitting units located at the same interior corner abuts against each other, and the two third light-emitting units are symmetrical about the center of the abutment position; The repeating unit further includes eight second fluorescent beads, which are disposed between the outer contour of the repeating unit and the second and third light-emitting units; the second fluorescent beads are disposed on the side of the second light-emitting unit away from the first light-emitting unit.

6. The direct-lit backlight module according to claim 3, characterized in that, The outer contour of the repeating unit is square; the repeating unit includes four second light-emitting units and eight third light-emitting units, the cross-sectional shape of the second light-emitting unit and the third light-emitting unit is an equilateral triangle, and the dimensions of the second light-emitting unit and the third light-emitting unit are equal; the second light-emitting units are disposed on the midline of the repeating unit; the third light-emitting units are disposed on the diagonal of the repeating unit, and two third light-emitting units are disposed at each interior corner of the repeating unit, with the two third light-emitting units located at the same interior corner being spaced apart and symmetrical about the diagonal axis of the repeating unit; The repeating unit further includes a first fluorescent bead and eight second fluorescent beads. The first fluorescent bead is disposed at the center of the repeating unit, and the second fluorescent beads are disposed at positions corresponding to the second and third light-emitting units and the outer contour of the repeating unit.

7. The direct-lit backlight module according to claim 1, characterized in that, The distance between two adjacent light-emitting units is positively correlated with the size of the light-emitting unit.

8. A display device, characterized in that, include: Display panel; A direct-lit backlight module is disposed on the light-incident side of the display panel, and the direct-lit backlight module includes the direct-lit backlight module as described in any one of claims 1-7.

Images