Backlight structure, display module and display device

Abstract

The invention relates to a backlight structure, a display module and a display device. The backlight structure includes a substrate; the plurality of light emitting devices are arranged on one side of the substrate; the diffusion plate is arranged on the sides, away from the substrate, of the multiple light-emitting devices; the diffusion plate comprises a diffusion plate body and a plurality of first ink pieces arranged at intervals, the plurality of first ink pieces are arranged corresponding to the plurality of light-emitting devices, and the first ink pieces are located between the corresponding light-emitting devices and the diffusion plate; the diffusion plate body comprises a plurality of sub-plate bodies, the sub-plate bodies are arranged in the direction parallel to the substrate, every two adjacent sub-plate bodies are connected, each sub-plate body comprises an edge part and a middle part, the edge parts are located on the periphery of the middle parts, the area of orthographic projection of the first ink pieces on the substrate is a first area, and the area of the first ink pieces located on the edge parts is a second area. The first area of the first ink member is smaller than that of the middle portion. Therefore, according to the backlight structure, the display module and the display device, the light emitting uniformity of the backlight structure can be improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to backlight structures, display modules and display devices. Background Technology

[0002] Mini LED, also known as sub-millimeter light-emitting diode, features high resolution, high brightness, energy saving, and fast response speed, and is considered a next-generation display technology. Currently, the main application of Mini LED in the display field is in Mini LED backlighting. Because Mini LED chips are smaller in size and spacing than conventional LED chips, direct control of the brightness of the backlight Mini LED chips allows for local dimming within a small area, thereby achieving higher brightness uniformity and color contrast within a smaller mixing distance.

[0003] In related technologies, Mini LED backlight structures typically include stacked substrates, Mini LED chips, and diffuser plates. However, the light emission uniformity of these Mini LED backlight structures needs improvement. Summary of the Invention

[0004] Therefore, it is necessary to provide a backlight structure, a display module, and a display device that can improve the light emission uniformity of the backlight structure.

[0005] In a first aspect, embodiments of this application provide a backlight structure, the backlight structure comprising:

[0006] substrate;

[0007] Multiple light-emitting devices are disposed on one side of the substrate;

[0008] A diffuser plate is disposed on the side of a plurality of light-emitting devices facing away from the substrate; the diffuser plate includes a diffuser plate body and a plurality of first ink elements disposed at intervals, the plurality of first ink elements being disposed corresponding to the plurality of light-emitting devices, and the first ink elements being located between the corresponding light-emitting devices and the diffuser plate;

[0009] The diffuser plate includes multiple sub-plates arranged in a direction parallel to the substrate. Adjacent sub-plates are connected. Each sub-plate includes an edge portion and a middle portion. The edge portion is located on the outer periphery of the middle portion. The area of ​​the first ink element projected onto the substrate is the first area. The first area of ​​the first ink element located at the edge portion is smaller than the first area of ​​the first ink element located at the middle portion.

[0010] The backlight structure provided in this application embodiment has a smaller first area of ​​the first ink element located at the edge than the first area of ​​the first ink element located in the middle. In the region corresponding to the edge of the backlight structure, the area of ​​the first ink element is set to be smaller, so that more light from the light-emitting device can enter the diffuser plate without passing through the first ink element. This is beneficial to improve the light output rate of the edge, alleviate the dark area phenomenon at the junction of two adjacent sub-plates, and make the display brightness at the junction of two adjacent sub-plates more consistent with the display brightness of the rest, thereby improving the light output uniformity of the backlight structure.

[0011] In one embodiment, two adjacent sub-boards are defined as a first sub-board and a second sub-board, respectively. The first ink element on the first sub-board that is closest to the second sub-board has a first distance from the first ink element on the second sub-board that is closest to the first sub-board. On the same sub-board, two adjacent first ink elements have a second distance, and the first distance is greater than the second distance.

[0012] In one embodiment, the diffuser plate includes a plurality of second ink elements spaced apart. The second ink elements are located on the side of the diffuser plate away from the substrate. The plurality of second ink elements are correspondingly disposed with a plurality of light-emitting devices. The orthographic projection of the second ink element on the substrate overlaps with the orthographic projection of the corresponding light-emitting device on the substrate.

[0013] In the corresponding first ink element and second ink element, the orthographic projection of the first ink element on the substrate lies within the orthographic projection of the second ink element on the substrate, and the distance between two adjacent second ink elements is less than the distance between two adjacent first ink elements; and / or,

[0014] The plurality of light-emitting devices include a first light-emitting device, which is located between the middle portion and the substrate. In the corresponding first light-emitting device and first ink element, the orthographic projection of the first light-emitting device on the substrate is located within the orthographic projection of the first ink element on the substrate.

[0015] In one embodiment, the side of the light-emitting device along the first direction includes a first side surface, and the distance between the first side surfaces of two adjacent light-emitting devices along the first direction is a first value; the side of the light-emitting device along the second direction includes a second side surface, and the distance between the second side surfaces of two adjacent light-emitting devices along the second direction is a second value; any two of the first direction, the second direction and the thickness direction of the substrate intersect.

[0016] The first distance between two adjacent sub-plates along the first direction is the third value, and the ratio of the third value to the first value ranges from 0.76 to 1; and / or,

[0017] On the same sub-plate, the second distance between two adjacent first ink elements along the first direction is a fourth value, and the ratio of the fourth value to the first value ranges from 0.66 to 0.74; and / or,

[0018] The distance between two adjacent second ink pieces along the first direction is a fifth value, and the ratio of the fifth value to the first value ranges from 0.21 to 0.3; and / or,

[0019] The first distance between two adjacent sub-plates along the second direction is the sixth value, and the ratio of the sixth value to the second value ranges from 0.73 to 1; and / or,

[0020] On the same sub-plate, the second distance between two adjacent first ink elements along the second direction is a seventh value, and the ratio of the seventh value to the second value ranges from 0.64 to 0.73; and / or,

[0021] The distance between two adjacent second ink pieces along the second direction is the eighth value, and the ratio of the eighth value to the second value ranges from 0.17 to 0.26; and / or,

[0022] The ratio of the thickness of the light-emitting device to the thickness of the diffuser plate ranges from 0.085 to 0.155; and / or,

[0023] The backlight structure includes multiple encapsulation sections, each corresponding to a multiple light-emitting device. The encapsulation section is located between the corresponding light-emitting device and the first ink element. The ratio of the thickness of the encapsulation section to the thickness of the diffuser plate ranges from 0.85 to 1.12; and / or,

[0024] The ratio of the thickness of the first ink component to the thickness of the diffuser plate ranges from 0.14 to 0.17; and / or,

[0025] The ratio of the thickness of the second ink component to the thickness of the diffuser plate ranges from 0.006 to 0.007.

[0026] In one embodiment, the reflectivity of the first ink element is greater than the reflectivity of the second ink element; and / or,

[0027] The reflectivity of the first ink component ranges from 80% to 90%; and / or,

[0028] The reflectivity of the second ink component ranges from 60% to 70%; and / or,

[0029] The thickness of the first ink component is greater than the thickness of the second ink component; and / or,

[0030] The thickness of the first ink component ranges from 0.010 mm to 0.012 mm; and / or,

[0031] The thickness of the second ink component ranges from 0.0045mm to 0.005mm.

[0032] In one embodiment, the plurality of light-emitting devices includes a second light-emitting device located between the edge portion and the substrate;

[0033] On the same sub-plate, the second light-emitting device includes a first sub-part and a second sub-part, which are arranged along the direction from the edge to the middle. In the corresponding second light-emitting device and the first ink element, the orthographic projection of the first ink element on the substrate overlaps with the orthographic projection of the second sub-part on the substrate, but does not overlap with the orthographic projection of the first sub-part on the substrate.

[0034] In one embodiment, in a first ink element at the same edge, the first ink element includes a main body and a plurality of protrusions spaced apart, the protrusions and the main body being arranged along the direction from the edge to the middle.

[0035] In one embodiment, a plurality of flow channels are provided on the side of the diffuser plate facing the substrate, and the flow channels are provided corresponding to the protrusions, with the protrusions located in the corresponding flow channels;

[0036] In the corresponding flow guide groove and protrusion, the flow guide groove includes a first groove sidewall near the corresponding main body, and the distance between the first groove sidewall and the surface of the diffuser plate opposite to the substrate gradually increases along the direction from the protrusion to the corresponding main body; and / or,

[0037] In the corresponding flow guide groove and protrusion, the flow guide groove includes a second groove sidewall on the side opposite to the corresponding main body, and the distance between the second groove sidewall and the surface of the diffuser plate opposite to the substrate gradually increases along the direction from the protrusion to the corresponding main body; and / or,

[0038] In the same first ink part, the distance between two adjacent protrusions gradually increases along the direction from the main body to the protrusion.

[0039] Secondly, embodiments of this application provide a display module, which includes a display screen and a backlight structure as described in the first aspect.

[0040] Thirdly, embodiments of this application provide a display device, which includes the display module of the second aspect. Attached Figure Description

[0041] Figure 1 This is a partial cross-sectional view of the backlight structure provided in an embodiment of this application.

[0042] Figure 2 Another partial cross-sectional view of the backlight structure provided in the embodiments of this application.

[0043] Figure 3 A top view of the first ink element provided in an embodiment of this application.

[0044] Figure 4A cross-sectional view of the first ink element and its edge portion provided for an embodiment of this application.

[0045] Explanation of reference numerals in the attached figures:

[0046] 100. Backlight structure; 110. Substrate; 120. Light-emitting device; 121. First sub-part; 122. Second sub-part; 1231. First side surface; 1232. Second side surface; 130. Diffuser plate; 131. First ink component; 1311. Main body; 1312. Protrusion; 132. Second ink component; 133. Diffuser plate body; 1331. Sub-plate body; 1341. First sub-plate body; 1342. Second sub-plate body; 1351. Edge portion; 1352. Middle portion; 140. Guide groove; 141. First groove sidewall; 142. Second groove sidewall; 150. Encapsulation portion; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0047] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0048] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0049] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0051] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0053] In related technologies, the backlight structure includes a substrate, a chip (e.g., a Mini LED), and a diffuser plate, with the chip disposed between the substrate and the diffuser plate. The diffuser plate includes a diffuser plate body and multiple ink structures located on the side of the diffuser plate body facing the substrate, the multiple ink structures being spaced apart and uniformly arranged. The diffuser plate body includes multiple sub-plates, the multiple sub-plates being arranged in a direction parallel to the substrate, with adjacent sub-plates spliced ​​together. All ink structures have the same area.

[0054] However, the splicing of two adjacent sub-boards makes it easy for dark areas to exist at the junction of the two adjacent sub-boards, resulting in lower display brightness at the junction of the two adjacent sub-boards and higher display brightness in the rest of the area, which leads to poor light uniformity of the backlight structure.

[0055] To address the aforementioned issues, embodiments of this application provide a backlight structure, a display module, and a display device, which can improve the light emission uniformity of the backlight structure.

[0056] See Figure 1 This application provides a backlight structure 100, which includes a substrate 110, a plurality of light-emitting devices 120, and a diffuser plate 130. The plurality of light-emitting devices 120 are disposed on one side of the substrate 110, and the diffuser plate 130 is disposed on the side of the plurality of light-emitting devices 120 away from the substrate 110. The diffuser plate 130 can uniformly distribute the light emitted by the light-emitting devices 120.

[0057] See Figure 1 The diffuser plate 130 includes a diffuser plate body 133 and a plurality of first ink elements 131 spaced apart. The first ink elements 131 are disposed on the side of the diffuser plate body 133 facing the substrate 110. The plurality of first ink elements 131 are correspondingly disposed with a plurality of light-emitting devices 120, and the first ink elements 131 are located between the corresponding light-emitting device 120 and the diffuser plate 130. The diffuser plate body 133 includes a plurality of sub-plate bodies 1331, which are arranged in a direction parallel to the substrate 110, and adjacent sub-plate bodies 1331 are spliced ​​together. By setting a plurality of sub-plate bodies 1331, the total area of ​​the diffuser plate body 133 can be increased. Sub-plate 1331 includes an edge portion 1351 and a middle portion 1352. The edge portion 1351 is located on the outer periphery of the middle portion 1352. The area of ​​the orthographic projection of the first ink element 131 on the substrate 110 is a first area. The first area of ​​the first ink element 131 located on the edge portion 1351 is smaller than the first area of ​​the first ink element 131 located on the middle portion 1352. Thus, in the region of the backlight structure 100 corresponding to the edge portion 1351, the area of ​​the first ink element 131 is set to be smaller, so that more light from the light-emitting device 120 can enter the diffuser plate 133 without passing through the first ink element 131. This is beneficial to improve the light extraction efficiency of the edge portion 1351, alleviate the dark area phenomenon at the junction of two adjacent sub-plates 1331, and make the display brightness at the junction of two adjacent sub-plates 1331 more consistent with the display brightness of the rest, thereby improving the light extraction uniformity of the backlight structure 100.

[0058] For example, the light transmittance of either the first ink element 131 or the second ink element 132 is less than the light transmittance of the diffuser plate 133.

[0059] For example, multiple sub-plate bodies 1331 are arranged along a first direction and / or a second direction.

[0060] For example, the light-emitting device 120 can be any one of LED, Mini LED, or Micro LED.

[0061] In some embodiments, see Figure 1Two adjacent sub-boards 1331 are defined as the first sub-board 1341 and the second sub-board 1342, respectively. The first ink element 131 on the first sub-board 1341 that is closest to the second sub-board 1342 has a first distance d1 with the first ink element 131 on the second sub-board 1342 that is closest to the first sub-board 1341. On the same sub-board 1331, two adjacent first ink elements 131 have a second distance d2, and the first distance d1 is greater than the second distance d2. In this way, more light from the light-emitting device 120 can enter the sub-board 1331 at the splicing point without passing through the first ink element 131, which helps to improve the brightness at the splicing point of the two adjacent sub-boards 1331, alleviates the dark area phenomenon at the junction of the two adjacent sub-boards 1331, and makes the display brightness at the junction of the two adjacent sub-boards 1331 more consistent with the display brightness of the rest, thereby improving the light emission uniformity of the backlight structure 100.

[0062] In some embodiments, see Figure 1 The diffuser plate 130 includes a plurality of second ink elements 132 spaced apart. The second ink elements 132 are located on the side of the diffuser plate 133 facing away from the substrate 110. The plurality of second ink elements 132 are correspondingly arranged with a plurality of light-emitting devices 120. The orthographic projection of the second ink element 132 on the substrate 110 overlaps with the orthographic projection of the corresponding light-emitting device 120 on the substrate 110. In this way, after the light emitted by the light-emitting device 120 enters the diffuser plate 133, it can be reflected back and forth between the first ink elements 131 and the second ink elements 132, which helps to adjust the light path in the diffuser plate 133 and improve the light uniformity of the backlight structure 100.

[0063] In some embodiments, see Figure 1 In the corresponding first ink element 131 and second ink element 132, the orthographic projection of the first ink element 131 on the substrate 110 lies within the orthographic projection of the second ink element 132 on the substrate 110, and the distance between two adjacent second ink elements 132 is smaller than the distance between two adjacent first ink elements 131. Thus, the smaller area of ​​the first ink element 131 results in a larger distance between two adjacent first ink elements 131, allowing more light from the light-emitting device 120 to enter the diffuser plate 133. Conversely, the larger area of ​​the second ink element 132 results in a smaller distance between two adjacent second ink elements 132, making it easier for light entering the diffuser plate 133 to be reflected and diffused by the second ink element 132.

[0064] In some embodiments, see Figure 1The plurality of light-emitting devices 120 include a first light-emitting device, which is located between the middle portion 1352 and the substrate 110. In the corresponding first light-emitting device and first ink element 131, the orthographic projection of the first light-emitting device on the substrate 110 is located within the orthographic projection of the first ink element 131 on the substrate 110. In this way, the small-angle light from the first light-emitting device mainly passes through the first ink element 131 before entering the diffuser plate 133, while the large-angle light from the first light-emitting device mainly passes through the gap between two adjacent first ink elements 131 and directly enters the diffuser plate 133. This makes the brightness of the small-angle light and the large-angle light from the first light-emitting device more consistent, which is beneficial to improving the uniformity of light output.

[0065] In some embodiments, see Figure 1 and Figure 2 The side surface of the light-emitting device 120 along the first direction X includes a first side surface 1231, and the distance between the first side surfaces 1231 of two adjacent light-emitting devices 120 along the first direction X is a first value A1. The side surface of the light-emitting device 120 along the second direction Y includes a second side surface 1232, and the distance between the second side surfaces 1232 of two adjacent light-emitting devices 120 along the second direction Y is a second value A2. Based on the distance between the first side surfaces 1231 of two adjacent light-emitting devices 120 along the first direction X, the ratio of the first distance d1 between two sub-plates 1331 along the first direction X, the second distance d2 between two adjacent first ink pieces 131 on the same sub-plate 1331 along the first direction X, and the distance between two adjacent second ink pieces 132 to the distance between the first side surfaces 1231 of two adjacent light-emitting devices 120 along the first direction X is obtained. Based on the distance between the second side surfaces 1232 of two adjacent light-emitting devices 120 along the second direction Y, the ratios of the first distance d1 between two sub-plates 1331 along the second direction Y, the second distance d2 between two adjacent first ink pieces 131 on the same sub-plate 1331 along the second direction Y, and the distance between two adjacent second ink pieces 132 along the second direction Y, to the distance between the second side surfaces 1232 of two adjacent light-emitting devices 120 along the second direction Y are obtained. Based on the thickness of the diffuser plate 133, the ratios of the thickness h2 of the light-emitting device 120, the thickness h3 of the encapsulation portion 150, the thickness h4 of the first ink piece 131, and the thickness h5 of the second ink piece 132, to the thickness h1 of the diffuser plate 133 are obtained.

[0066] See Figure 1 and Figure 2The substrate 110 may have a first direction X, a second direction Y, and a third direction Z, all of which are different. The first direction X and the second direction Y can be any two different directions parallel to the substrate 110, and the third direction Z can be any direction intersecting a plane parallel to the substrate 110. For example, the first direction X, the second direction Y, and the third direction Z can be perpendicular to each other. Exemplarily, the first direction X can be the length direction of the substrate 110, the second direction Y can be the width direction of the substrate 110, and the third direction Z can be the thickness direction of the substrate 110. The length, width, and thickness in the embodiments of this application are merely for descriptive convenience and do not imply any limitation on the dimensions. For example, the width can be greater than, equal to, or less than the length.

[0067] For example, the dimension of the backlight structure 100 along the first direction is larger than the dimension of the backlight structure 100 along the second direction.

[0068] For example, see Figure 1 The first distance d1 between two adjacent sub-plates 1331 along the first direction X is a third value A3. The ratio of the third value A3 to the first value A1 is in the range of 0.76-1. This avoids the third value A3 being too small, which would help alleviate the dark area phenomenon at the junction of the two adjacent sub-plates 1331. In addition, it also avoids the third value A3 being too large, which would prevent the first ink component 131 at the junction from having a poor light reflection effect on the diffuser plate 133. For example, this ratio can be 0.76, 0.8, 0.9, 1, or any value between 0.76 and 1.

[0069] For example, see Figure 1 On the same sub-plate 1331, the second distance d2 between two adjacent first ink elements 131 along the first direction X is a fourth value A4, and the ratio of the fourth value A4 to the first value A1 ranges from 0.66 to 0.74. This avoids the fourth value A4 being too small, which would improve the light extraction efficiency, and also avoids the fourth value A4 being too large, which would improve the light uniformity of the diffuser plate 130. For example, this ratio can be 0.66, 0.7, 0.72, 0.74, or any value between 0.66 and 0.74.

[0070] For example, see Figure 1 The distance between two adjacent second ink elements 132 along the first direction X is a fifth value A5, and the ratio of the fifth value A5 to the first value A1 ranges from 0.21 to 0.3. This avoids the fifth value A5 being too small, which would improve the light extraction efficiency, and also avoids the fifth value A5 being too large, which would improve the light uniformity of the diffuser plate 130. This ratio can be 0.21, 0.23, 0.26, 0.3, or any value between 0.21 and 0.3.

[0071] For example, see Figure 2 The first distance d1 between two adjacent sub-plates 1331 along the second direction Y is a sixth value A6. The ratio of the sixth value A6 to the second value A2 is in the range of 0.73-1. This avoids the sixth value A6 being too small, which would help alleviate the dark area phenomenon at the junction of the two adjacent sub-plates 1331. In addition, it also avoids the sixth value A6 being too large, which would prevent the first ink component 131 at the junction from having a poor light reflection effect on the diffuser plate 133. For example, this ratio can be 0.73, 0.76, 0.8, 0.9, 1, or any value between 0.73 and 1.

[0072] For example, see Figure 2 On the same sub-plate 1331, the second distance d2 between two adjacent first ink elements 131 along the second direction Y is a seventh value A7. The ratio of the seventh value A7 to the second value A2 ranges from 0.64 to 0.73. This avoids the seventh value A7 being too small, which would be beneficial for improving the light extraction rate. In addition, it also avoids the seventh value A7 being too large, which would be beneficial for improving the light uniformity of the diffuser plate 130. For example, this ratio can be 0.64, 0.66, 0.7, 0.72, 0.73, or any value between 0.64 and 0.73.

[0073] For example, see Figure 2 The distance between two adjacent second ink elements 132 along the second direction Y is the eighth value A8. The ratio of the eighth value A8 to the second value A2 ranges from 0.17 to 0.26. This avoids the eighth value A8 being too small, which would be beneficial for improving the light extraction efficiency. In addition, it also avoids the eighth value A8 being too large, which would be beneficial for improving the light uniformity of the diffuser plate 130. This ratio can be 0.17, 0.19, 0.21, 0.23, 0.26, or any value between 0.17 and 0.26.

[0074] For example, see Figure 1 The ratio of the thickness h2 of the light-emitting device 120 to the thickness h1 of the diffuser plate 133 is in the range of 0.085-0.155. For example, the ratio can be 0.085, 0.100, 0.120, 0.140, 0.155 or any value between 0.085 and 0.155.

[0075] In some embodiments, see Figure 1 The backlight structure 100 includes multiple encapsulation portions 150, which are correspondingly disposed with multiple light-emitting devices 120. The encapsulation portion 150 is located between the corresponding light-emitting device 120 and the first ink element 131. In this way, the encapsulation portion 150 can protect the corresponding light-emitting device 120.

[0076] For example, the encapsulation portion 150 can be an encapsulating adhesive.

[0077] For example, the ratio of the thickness h3 of the encapsulation portion 150 to the thickness h1 of the diffusion plate 133 is in the range of 0.85-1.12. For example, the ratio can be 0.85, 0.90, 0.95, 1.00, 1.12 or any value between 0.85 and 1.12.

[0078] For example, see Figure 1 The ratio of the thickness h4 of the first ink element 131 to the thickness h1 of the diffuser plate 133 is in the range of 0.14-0.17. This allows for a larger thickness of the first ink element 131, which is beneficial for improving the reflectivity of the first ink element 131. For example, this ratio can be 0.14, 0.15, 0.16, 0.17, or any value between 0.14 and 0.17.

[0079] For example, see Figure 1 The ratio of the thickness h5 of the second ink element 132 to the thickness h1 of the diffuser plate 133 is in the range of 0.006-0.007, which allows the thickness of the second ink element 132 to be smaller, which is beneficial to improving the light extraction efficiency. For example, this ratio can be 0.006, 0.007, or any value between 0.006 and 0.007.

[0080] In some embodiments, the reflectivity of the first ink element 131 is greater than that of the second ink element 132. This results in a higher reflectivity of the first ink element 131, which is beneficial to improving the light uniformity of the diffuser plate 130. In addition, the reflectivity of the second ink element 132 is lower, which is beneficial to improving the light output efficiency of the diffuser plate 130.

[0081] For example, the reflectivity of the first ink element 131 is in the range of 80%-90%, which makes the reflectivity of the first ink element 131 relatively high, which is beneficial to improving the light uniformity of the diffuser plate 130. For example, the reflectivity of the first ink element 131 can be 80%, 85%, 90%, or any value between 80% and 90%.

[0082] For example, the reflectivity of the second ink element 132 is in the range of 60%-70%, which makes the reflectivity of the second ink element 132 relatively low, which is beneficial to improving the light emission efficiency of the diffuser plate 130. For example, the reflectivity of the second ink element 132 can be 60%, 65%, 70%, or any value between 60% and 70%.

[0083] In some embodiments, the thickness of the first ink element 131 is greater than the thickness of the second ink element 132. This makes the thickness of the first ink element 131 larger, which is beneficial to improving the reflectivity of the first ink element 131, and thus beneficial to improving the light uniformity of the diffuser plate 130. In addition, the thickness of the second ink element 132 is smaller, which is beneficial to improving the light output efficiency of the diffuser plate 130.

[0084] For example, the thickness of the first ink element 131 is in the range of 0.010mm-0.012mm. For instance, the thickness of the first ink element 131 can be 0.010mm, 0.011mm, 0.012mm or any value between 0.010mm and 0.012mm.

[0085] For example, the thickness of the second ink element 132 is in the range of 0.0045mm-0.005mm. For instance, the thickness of the second ink element 132 can be 0.0045mm, 0.0047mm, 0.0049mm, 0.0050mm or any value between 0.0045mm and 0.005mm.

[0086] It should be noted that, in the relevant technologies, before actual mass production, the ratios of the distance between two adjacent first ink components 131, the distance between two adjacent second ink components 132, the distance between the sides of two adjacent light-emitting devices 120 along the same direction, the thickness of the light-emitting device 120, the thickness of the encapsulation part 150, the thickness of the first ink component 131, the thickness of the second ink component 132, and the thickness of the diffuser plate 133 were not verified and solidified. First, the distance between the sides of two adjacent light-emitting devices 120 along the same direction (equivalent to LED pitch) needs to be determined. Then, the above parameters of the small board (i.e., the backlight structure 100 including only a single sub-board body 1331) need to be set. Next, the small board is prepared and the visual effect is tested. If the visual effect is not up to standard, the above parameters need to be readjusted and verified again, which leads to an extended time cycle. In addition, the relevant technology uses a small board for verification instead of directly preparing a large board (i.e., the backlight structure 100 including multiple sub-board bodies 1331) for verification. The effect of the large board needs to be derived from the effect of the small board, which has a "local and overall difference". The effect of the small board cannot fully represent the actual effect of the large board, resulting in test errors and insufficient test accuracy. The final product has poor visual effect.

[0087] Therefore, in this embodiment, after verifying and solidifying the above-mentioned parameters of the large board, the dimensions of each component of the backlight structure 100 can be quickly and reasonably determined directly based on the LEDPitch. The backlight structure 100 can then be produced according to the verified parameters, eliminating the need for repeated small-board verification, reducing debugging and mass production costs, significantly shortening the debugging cycle, and lowering R&D costs. Furthermore, with consistent parameters across multiple sub-boards 1331, no additional trimming or compensation is required during splicing, reducing the mass production defect rate and further controlling costs. In the case of splicing multiple sub-boards 1331 of the large board, parameter consistency ensures precise light control of the optical characteristics and splicing boundaries of the sub-boards 1331, eliminating seam defects, improving visual effects, and achieving a seamless splicing effect. Ultimately, this achieves the effects of "seamless splicing, thin and transparent modules, and reduced costs."

[0088] In some embodiments, see Figure 2 The plurality of light-emitting devices 120 include a second light-emitting device, which is located between the edge portion 1351 and the substrate 110. On the same sub-plate 1331, the second light-emitting device includes a first sub-part 121 and a second sub-part 122, which are arranged along the direction from the edge portion 1351 to the middle portion 1352. In the corresponding second light-emitting device and the first ink element 131, the orthographic projection of the first ink element 131 on the substrate 110 overlaps with the orthographic projection of the second sub-part 122 on the substrate 110, and the orthographic projection of the first ink element 131 on the substrate 110 does not overlap with the orthographic projection of the first sub-part 121 on the substrate 110. In this way, the second sub-part 122, which is close to the middle part 1352, is blocked by the first ink element 131, which helps to improve the uniformity of light output. In addition, the first sub-part 121, which is far from the middle part 1352, is not blocked by the first ink element 131, which helps to better alleviate the dark area phenomenon at the junction of two adjacent sub-plates 1331.

[0089] For example, see Figure 2 In the corresponding second light-emitting device and the first ink element 131, the orthographic projection of the first ink element 131 on the substrate 110 overlaps with the orthographic projection of the second sub-part 122 on the substrate 110.

[0090] In some embodiments, see Figure 3In the first ink element 131 on the same edge portion 1351, the first ink element 131 includes a main body portion 1311 and a plurality of protrusions 1312 spaced apart. The protrusions 1312 and the main body portion 1311 are arranged along the direction from the edge portion 1351 to the middle portion 1352. That is, on the same sub-plate 1331, the main body portion 1311 is disposed closer to the middle portion 1352 than the protrusions 1312, and the protrusions 1312 are disposed further away from the middle portion 1352. By arranging the plurality of protrusions 1312 spaced apart along the circumference of the middle portion 1352, the gap between two adjacent protrusions 1312 allows more light from the light-emitting device to be emitted directly without passing through the first ink element 131, which helps to better alleviate the dark area phenomenon at the junction of two adjacent sub-plates 1331.

[0091] In some embodiments, when preparing the first ink part 131, an ink material can be formed first, and the first ink part 131 can be formed after the ink material is cured. The ink material can have a certain degree of fluidity before it is cured.

[0092] In some embodiments, see Figure 4 A plurality of flow channels 140 are provided on the side of the diffuser plate 133 facing the substrate 110. The flow channels 140 are correspondingly arranged with the protrusions 1312, and the protrusions 1312 are located within the corresponding flow channels 140. A plurality of protrusions 1312 of a first ink component 131 are correspondingly arranged with a plurality of flow channels 140. Thus, when preparing the first ink component with the edge portion 1351, the ink material can be first placed on the side of the flow channel 140 near the middle portion 1352, and the ink material is arranged adjacent to the flow channel 140. The ink material overflows into the flow channel 140 and, after curing, forms a protrusion 1312 that matches the shape of the flow channel 140. The flow channel 140 can better control the shape of the protrusion 1312. Furthermore, the flow channel 140 has a limiting effect on the position of the ink material, which can improve the preparation accuracy of the first ink component 131.

[0093] In this application, the A-B correspondence setting can refer to one A corresponding to at least one B, or one B corresponding to at least one A. This application will use one A corresponding to one B as an example for explanation.

[0094] In some embodiments, see Figure 4 In the corresponding flow channel 140 and protrusion 1312, the flow channel 140 includes a first channel sidewall 141 near the corresponding main body 1311. The distance between the first channel sidewall 141 and the surface of the diffuser plate 133 facing away from the substrate 110 gradually increases along the direction from the protrusion 1312 to the corresponding main body 1311. For example, the first channel sidewall 141 is inclined. In this way, the first channel sidewall 141 has a guiding function, and the uncured ink material can flow into the flow channel 140 more easily.

[0095] In some embodiments, see Figure 4 In the corresponding flow channel 140 and protrusion 1312, the flow channel 140 includes a second channel sidewall 142 on the side opposite to the corresponding main body 1311. The first channel sidewall 141 and the second channel sidewall 142 are arranged opposite to each other and spaced apart. The distance between the second channel sidewall 142 and the surface of the diffuser plate 133 opposite to the substrate 110 gradually increases along the direction from the protrusion 1312 to the corresponding main body 1311. For example, the second channel sidewall 142 is inclined. In this way, the second channel sidewall 142 can prevent uncured ink material from continuing to overflow outward and exceed the flow channel 140, and can better limit the position of the protrusion 1312.

[0096] In some embodiments, see Figure 3 In the same first ink component 131, the distance between two adjacent protrusions 1312 gradually increases along the direction from the main body 1311 to the protrusion 1312. This makes the distance between the ends of the two adjacent protrusions 1312 near the middle part 1352 smaller and the size of the end of the protrusion 1312 near the middle part 1352 larger, which is beneficial to improving the connection stability between the protrusion 1312 and the main body 1311. In addition, the distance between the ends of the two adjacent protrusions 1312 away from the middle part 1352 is larger, which is beneficial to better alleviate the dark area phenomenon at the splicing junction of two adjacent sub-plates 1331.

[0097] For example, the backlight structure 100 is a large-size backlight structure. For instance, the size of the backlight structure 100 is greater than or equal to 55 inches.

[0098] This application provides a display module, which includes a display screen and the backlight structure 100 described in the above embodiments. For example, the display screen may be a liquid crystal display (LCD).

[0099] This application provides a display device, which includes the display module described in the above embodiments.

[0100] For example, the display module can be applied to a display device, which can be a mobile phone, television, laptop, desktop monitor, tablet computer, digital camera, smart bracelet, smart glasses, vehicle display, industrial control equipment, medical display screen, touch interactive terminal, etc. The embodiments of this application do not make any special limitations in this regard.

[0101] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0102] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A backlight structure, characterized in that, The backlight structure includes: substrate; Multiple light-emitting devices are disposed on one side of the substrate; A diffuser plate is disposed on the side of the plurality of light-emitting devices facing away from the substrate; the diffuser plate includes a diffuser plate body and a plurality of first ink elements spaced apart, the plurality of first ink elements being disposed corresponding to the plurality of light-emitting devices, and the first ink elements being located between the corresponding light-emitting device and the diffuser plate; The diffusion plate includes multiple sub-plates arranged in a direction parallel to the substrate. Adjacent sub-plates are connected. Each sub-plate includes an edge portion and a middle portion. The edge portion is located on the outer periphery of the middle portion. The area of ​​the orthographic projection of the first ink element on the substrate is a first area. The first area of ​​the first ink element located at the edge portion is smaller than the first area of ​​the first ink element located at the middle portion.

2. The backlight structure according to claim 1, characterized in that, Two adjacent sub-boards are defined as a first sub-board and a second sub-board. The first ink element on the first sub-board that is closest to the second sub-board has a first distance from the first ink element on the second sub-board. On the same sub-board, two adjacent first ink elements have a second distance, and the first distance is greater than the second distance.

3. The backlight structure according to claim 2, characterized in that, The diffuser plate includes a plurality of second ink elements spaced apart. The second ink elements are located on the side of the diffuser plate away from the substrate. The plurality of second ink elements are correspondingly arranged with the plurality of light-emitting devices. The orthographic projection of the second ink element on the substrate overlaps with the orthographic projection of the corresponding light-emitting device on the substrate. In the corresponding first ink element and second ink element, the orthographic projection of the first ink element on the substrate lies within the orthographic projection of the second ink element on the substrate, and the distance between two adjacent second ink elements is less than the distance between two adjacent first ink elements; and / or, The plurality of light-emitting devices include a first light-emitting device, which is located between the middle portion and the substrate. In the corresponding first light-emitting device and the first ink element, the orthographic projection of the first light-emitting device on the substrate is located within the orthographic projection of the first ink element on the substrate.

4. The backlight structure according to claim 3, characterized in that, The light-emitting device includes a first side surface along one side of the first direction, and the distance between the first side surfaces of two adjacent light-emitting devices along the first direction is a first value; the light-emitting device includes a second side surface along one side of the second direction, and the distance between the second side surfaces of two adjacent light-emitting devices along the second direction is a second value; any two of the first direction, the second direction and the thickness direction of the substrate intersect. The first distance between two adjacent sub-plates along the first direction is a third value, and the ratio of the third value to the first value ranges from 0.76 to 1; and / or, On the same sub-plate, the second distance between two adjacent first ink elements along the first direction is a fourth value, and the ratio of the fourth value to the first value ranges from 0.66 to 0.74; and / or, The distance between two adjacent second ink pieces along the first direction is a fifth value, and the ratio of the fifth value to the first value ranges from 0.21 to 0.3; and / or, The first distance between two adjacent sub-plates along the second direction is a sixth value, and the ratio of the sixth value to the second value is in the range of 0.73-1; And / or, On the same sub-plate, the second distance between two adjacent first ink elements along the second direction is a seventh value, and the ratio of the seventh value to the second value ranges from 0.64 to 0.73; and / or, The distance between two adjacent second ink pieces along the second direction is an eighth value, and the ratio of the eighth value to the second value ranges from 0.17 to 0.26; and / or, The ratio of the thickness of the light-emitting device to the thickness of the diffuser plate ranges from 0.085 to 0.155; and / or, The backlight structure includes multiple encapsulation sections, which are correspondingly disposed with respect to the multiple light-emitting devices. Each encapsulation section is located between the corresponding light-emitting device and the first ink component. The ratio of the thickness of the encapsulation section to the thickness of the diffuser plate ranges from 0.85 to 1.12; and / or, The ratio of the thickness of the first ink component to the thickness of the diffuser plate ranges from 0.14 to 0.17; and / or, The ratio of the thickness of the second ink component to the thickness of the diffuser plate ranges from 0.006 to 0.

007.

5. The backlight structure according to claim 3, characterized in that, The reflectivity of the first ink element is greater than the reflectivity of the second ink element; and / or, The reflectivity of the first ink component ranges from 80% to 90%; and / or, The reflectivity of the second ink component ranges from 60% to 70%; and / or, The thickness of the first ink component is greater than the thickness of the second ink component; and / or, The thickness of the first ink component ranges from 0.010 mm to 0.012 mm; and / or, The thickness of the second ink component ranges from 0.0045mm to 0.005mm.

6. The backlight structure according to any one of claims 1-5, characterized in that, The plurality of light-emitting devices includes a second light-emitting device, which is located between the edge portion and the substrate; On the same sub-plate, the second light-emitting device includes a first sub-part and a second sub-part, which are arranged along the direction from the edge to the middle part. In the corresponding second light-emitting device and the first ink element, the orthographic projection of the first ink element on the substrate overlaps with the orthographic projection of the second sub-part on the substrate, but does not overlap with the orthographic projection of the first sub-part on the substrate.

7. The backlight structure according to claim 6, characterized in that, In the first ink element at the same edge portion, the first ink element includes a main body portion and a plurality of protrusions spaced apart, the protrusions and the main body portion being arranged along the direction from the edge portion to the middle portion.

8. The backlight structure according to claim 7, characterized in that, The diffuser plate has a plurality of flow channels on the side facing the substrate, and the flow channels are corresponding to the protrusions, with the protrusions located in the corresponding flow channels. In the corresponding flow guide groove and the protrusion, the flow guide groove includes a first groove sidewall near the corresponding main body portion, and the distance between the first groove sidewall and the surface of the diffuser plate opposite to the substrate gradually increases along the direction from the protrusion to the corresponding main body portion; and / or, In the corresponding flow guide groove and the protrusion, the flow guide groove includes a second groove sidewall on the side opposite to the corresponding main body portion, and the distance between the second groove sidewall and the surface of the diffuser plate opposite to the substrate gradually increases along the direction from the protrusion to the corresponding main body portion; and / or, In the same first ink component, the distance between two adjacent protrusions gradually increases along the direction from the main body to the protrusion.

9. A display module, characterized in that, The display module includes a display screen and a backlight structure as described in any one of claims 1-8.

10. A display device, characterized in that, The display device includes the display module as described in claim 9.

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