Display module and transparent display device

Abstract

The invention discloses a display module and a display device, the display module comprises a plurality of display substrates which are arranged in an array and are mutually independent, and each display substrate comprises a transparent substrate and a plurality of light-emitting devices arranged on the transparent substrate; a gap is formed between every two adjacent display substrates; the display module further comprises a transparent supporting substrate, and the multiple display substrates are located on the same side of the transparent supporting substrate. The transparent support substrates are continuously distributed across the gap, and orthographic projections of the plurality of light-emitting devices of each display substrate on the extension surface of the transparent support substrate are located in the support substrate; the display module further comprises a first filling layer, and the first filling layer is at least located in the gap.

Description

Display modules and transparent display devices Technical Field

[0001] This disclosure relates to the field of display technology, specifically to a display module and a transparent display device. Background Technology

[0002] Miniature inorganic light-emitting diodes include MiniLEDs and MicroLEDs. MiniLEDs refer to light-emitting diode (LED) chips with a die size of approximately 100–300 micrometers. MicroLEDs refer to light-emitting diode chips with a die size of less than 100 micrometers. MiniLEDs / MicroLEDs offer advantages such as energy efficiency, simple structure, small size, and thinness, making them widely used in transparent display products to improve the transmittance of display products.

[0003] Summary of the Invention

[0004] This disclosure presents a display module and a transparent display device.

[0005] This disclosure provides a display module, including a plurality of display substrates arranged in an array and independent of each other. Each display substrate includes a transparent substrate and a plurality of light-emitting devices disposed on the transparent substrate. There is a gap between two adjacent display substrates. The display module also includes a transparent support substrate, and the plurality of display substrates are all located on the same side of the transparent support substrate.

[0006] The transparent support substrates are continuously distributed across the gap, and the orthographic projections of the plurality of light-emitting devices of each display substrate onto the extended surface of the transparent support substrate are all located within the support substrate.

[0007] The display module further includes a first filling layer, which is located at least in the gap.

[0008] In some embodiments, the width of the gap is in the range of 50 micrometers to 300 micrometers.

[0009] In some embodiments, the refractive index n1 of the first filling layer and the refractive index n2 of the transparent substrate satisfy the following condition: 0.99 ≤ n1 / n2 ≤ 1.06.

[0010] In some embodiments, the transparent substrate is made of glass; the display module further includes a first filling layer located in the gap, the refractive index n1 of the first filling layer being between 1.5 and 1.6.

[0011] In some embodiments, the transparent substrate includes a first surface supporting the light-emitting device, a second surface facing away from the first surface, and a side surface located between the first surface and the second surface;

[0012] Wherein, for two adjacent opposite sides of the display substrate, the first filling layer is continuously distributed along the side from the first side to the second side.

[0013] In some embodiments, the transparent support substrate is located on the side of the second surface away from the first surface;

[0014] In the thickness direction of the transparent substrate, the maximum distance from the first filling layer to the transparent support substrate is less than or equal to the distance from the surface of the light-emitting device away from the second surface to the transparent support substrate.

[0015] In some embodiments, the surface of the first filling layer near the first surface in the thickness direction of the transparent substrate is flush with the first surface.

[0016] In some embodiments, the refractive index n1 of the first filling layer and the refractive index n2 of the transparent substrate satisfy the following condition: 0.73 ≤ n1 / n2 < 0.99;

[0017] The surface of the first filling layer near the first surface in the thickness direction of the transparent substrate is convex.

[0018] In some embodiments, the side surface is a hydrophobic surface, and / or the first surface includes a hydrophobic region adjacent to the gap.

[0019] In some embodiments, the first filling layer includes a protrusion, the protrusion being a portion of the first filling layer that is higher than the first surface in the thickness direction of the transparent substrate relative to the second surface, and the surface of the protrusion closer to the first surface in the thickness direction of the transparent substrate is the convex surface;

[0020] The orthographic projection of the protrusion on the transparent support substrate overlaps with the orthographic projection of the first surfaces of the two adjacent display substrates corresponding to the first filling layer on the transparent support substrate.

[0021] In some embodiments, the refractive index n1 of the first filling layer and the refractive index n2 of the transparent substrate satisfy the following condition: 0.73 ≤ n1 / n2 < 0.99;

[0022] The first filling layer includes a transparent substrate, and the display module further includes diffused particles distributed in the transparent substrate. The transparent substrate and the diffused particles constitute the first filling layer.

[0023] In some embodiments, the transparent support substrate is located on the side of the second surface away from the first surface;

[0024] The plurality of display substrates include adjacent first display substrates and second display substrates, wherein near the edge of the gap, the distance from the first surface of the first display substrate to the transparent support substrate is greater than the distance from the first surface of the second display substrate to the transparent support substrate;

[0025] The first filling layer between the first display substrate and the second display substrate has opposing first and second edges on the surface away from the transparent support substrate. The first edge is connected to a first surface of the first display substrate, and the second edge is connected to a first surface of the second display substrate. Along the direction from the first edge to the second edge, the distance from the surface of the first filling layer away from the transparent support substrate to the transparent support substrate gradually decreases.

[0026] In some embodiments, in the thickness direction of the transparent substrate, the distance from the first edge to the transparent support substrate is equal to the distance from the first surface of the first display substrate to the transparent support substrate, and the distance from the second edge to the transparent support substrate is equal to the distance from the first surface of the second display substrate to the transparent support substrate.

[0027] In some embodiments, the transparent substrate includes a first surface supporting the light-emitting device, a second surface facing away from the first surface, and a side surface located between the first surface and the second surface;

[0028] In this embodiment, the opposite sides of two adjacent display substrates are inclined surfaces with the same tilt direction, and the inclined surfaces intersect the thickness direction of the transparent substrate.

[0029] In some embodiments, the opposing inclined surfaces of two adjacent display substrates are parallel to each other, and the vertical distance between the two opposing inclined surfaces is in the range of 50 micrometers to 300 micrometers.

[0030] In some embodiments, within the same display substrate, the orthographic projection of the light-emitting device on the transparent support substrate does not overlap with the orthographic projection of the inclined surface on the transparent support substrate.

[0031] In some embodiments, the width W of the orthographic projection of the inclined plane onto the transparent support substrate satisfies: W ≤ P1 - L;

[0032] Wherein, P1 is the spacing between two adjacent light-emitting devices arranged along the first direction in the display substrate; the first direction is a direction extending along the direction of the display substrate and perpendicular to the direction of the gap extension; L is the width of the gap between two display substrates arranged along the first direction in the first direction.

[0033] In some embodiments, the two light-emitting devices located on opposite sides of the gap along its width direction and adjacent to the gap are respectively a first light-emitting device and a second light-emitting device; the distance P2 between the first light-emitting device and the second light-emitting device satisfies: 0.9*P3≤P2≤1.1*P3.

[0034] Wherein, P3 is the spacing between two adjacent light-emitting devices in a single display substrate, whose light-emitting colors are the same as the first light-emitting device and the second light-emitting device, and which are arranged along the width direction of the gap.

[0035] In some embodiments, the orthographic projection of the first filling layer on the transparent support substrate does not overlap with the orthographic projection of any of the light-emitting devices on the transparent support substrate.

[0036] In some embodiments, the display module further includes a second filling layer, which is located on the side of the light-emitting device away from the transparent substrate and is continuously distributed thereon, and the orthographic projections of the plurality of light-emitting devices in the display module onto the transparent substrate are all within the orthographic projection range of the second filling layer onto the transparent substrate;

[0037] The second filling layer includes a first portion and a second portion, wherein the first portion is located on the side of the light-emitting device away from the transparent substrate, and the second portion is located between two adjacent light-emitting devices;

[0038] The first filling layer and the second filling layer are in contact.

[0039] In some embodiments, the refractive index n3 of the second filling layer and the refractive index n2 of the transparent substrate satisfy the following condition: 0.99 ≤ n3 / n2 ≤ 1.06.

[0040] In some embodiments, the transparent support substrate is located on the side of the second filling layer away from the display substrate;

[0041] Alternatively, the display module may further include a transparent cover plate located on the side of the second filling layer away from the display substrate, and the transparent support substrate located on the side of the display substrate away from the second filling layer.

[0042] This disclosure also provides a display module, including a plurality of display substrates arranged in an array and independent of each other. Each display substrate includes a transparent substrate and a plurality of light-emitting devices disposed on the transparent substrate. There is a gap between two adjacent display substrates. The display module also includes a transparent support substrate, and the plurality of display substrates are all located on the same side of the transparent support substrate.

[0043] The transparent support substrates are continuously distributed across the gap, and the orthographic projections of the plurality of light-emitting devices of each display substrate onto the extended surface of the transparent support substrate are all located within the transparent support substrate.

[0044] The transparent substrate includes a first surface supporting the light-emitting device, a second surface facing away from the first surface, and a side surface located between the first surface and the second surface;

[0045] In this embodiment, the opposite sides of two adjacent display substrates are inclined surfaces with the same tilt direction, and the inclined surfaces intersect the thickness direction of the transparent substrate.

[0046] In some embodiments, the opposing inclined surfaces of two adjacent display substrates are parallel to each other, and the vertical distance between the two opposing inclined surfaces is in the range of 50 micrometers to 300 micrometers.

[0047] In some embodiments, within the same display substrate, the orthographic projection of the light-emitting device on the transparent support substrate does not overlap with the orthographic projection of the inclined surface on the transparent support substrate.

[0048] In some embodiments, the plurality of light-emitting devices in the display substrate constitute a plurality of repeating units, each repeating unit including a plurality of light-emitting devices of different colors arranged along a first direction;

[0049] The width W of the inclined plane satisfies: W≤P1-L;

[0050] Wherein, P1 is the spacing between two adjacent light-emitting devices arranged along the first direction in the display substrate; the first direction is a direction extending along the direction of the display substrate and perpendicular to the direction of the gap extension; L is the width of the gap between two display substrates arranged along the first direction in the first direction.

[0051] In some embodiments, the display module further includes a first filling layer, which is located at least in the gap;

[0052] The refractive index n1 of the first filling layer and the refractive index n2 of the transparent substrate satisfy the following condition: 0.99≤n1 / n2≤1.06.

[0053] This disclosure also provides a transparent display device, including the above-described display module and frame, wherein the frame is disposed around two opposite light-emitting surfaces of the display module;

[0054] The plurality of display substrates are arranged in one of the following configurations: one row and N columns, N rows and one column, two rows and N columns, or N rows and two columns, where N is a positive integer greater than 1.

[0055] Each of the display substrates includes driving leads for driving the plurality of light-emitting devices, the driving leads being led out from the side surface of the transparent substrate near the light-emitting device and through the edge of each display substrate near the frame.

[0056] In some embodiments, the display device further includes a drive circuit board electrically connected to the drive leads of each of the display substrates;

[0057] The frame includes a retaining wall portion and a first edge portion and a second edge portion connected to the retaining wall portion. The retaining wall portion surrounds the side of the display module. The first edge portion and the second edge portion are distributed on opposite sides of the display module along its thickness direction, and the first edge portion and the second edge portion are located at the edge position of the display module.

[0058] A receiving space is defined between the display module and the frame, and at least a portion of the driving circuit board is located within the receiving space. Attached Figure Description

[0059] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0060] Figure 1A is a schematic diagram showing the principle of creating a visually visible seam in the display module.

[0061] Figure 1B is a schematic diagram showing the principle of light leakage at the gap position of the display module.

[0062] Figure 2A shows a plan view of the gapless display module and a side view of the gapless display module viewed from a wide viewing angle of 60°.

[0063] Figure 2B shows the illuminance distribution and illuminance curve of the gapless display module in the non-display state.

[0064] Figure 2C shows the illuminance distribution and illuminance curve of the gapless display module in display mode.

[0065] Figure 3 shows a plan view of the gapped display module and a side view of the gapped display module when viewed from a wide 60° angle.

[0066] Figure 4A shows the illuminance distribution and illuminance curve of the gapped display module in the non-display state.

[0067] Figure 4B shows the illuminance distribution and illuminance curve of the gapped display module in display mode.

[0068] Figure 5A is a schematic diagram of a display module provided in some embodiments of this disclosure.

[0069] Figure 5B is a schematic diagram of a transparent substrate and an adjacent first filling layer in Figure 5A.

[0070] Figure 6A shows the illuminance distribution curves in the non-display state when the display module provided in some embodiments of this disclosure uses a first filling layer with different refractive indices.

[0071] Figure 6B shows the illuminance distribution and illuminance curve of the display module shown in Figure 5A in the display state.

[0072] Figure 7A is a schematic diagram of the display module provided in the second embodiment of this disclosure.

[0073] Figure 7B is an exploded view of the two transparent substrates and a first filling layer in Figure 7A.

[0074] Figure 8A is a schematic diagram of the display module in Comparative Example 1.

[0075] Figure 8B shows the illuminance distribution and illuminance curve of the display module shown in Figure 8A in the non-display state.

[0076] Figure 8C shows the illuminance distribution and illuminance curve of the display module shown in Figure 7A in the non-display state.

[0077] Figure 9 is a schematic diagram of the display module provided in the third embodiment of this disclosure.

[0078] Figure 10 is a schematic diagram of the display module provided in the fourth embodiment of this disclosure.

[0079] Figure 11 is another schematic diagram of the display module provided in the fourth embodiment of this disclosure.

[0080] Figure 12 is another schematic diagram of the display module provided in the fourth embodiment of this disclosure.

[0081] Figure 13A shows the illuminance distribution and illuminance curve of the display module shown in Figure 10 in the display state.

[0082] Figure 13B shows the illuminance distribution and illuminance curve of the display module in Comparative Example 2 in display mode.

[0083] Figure 14A is a schematic diagram of the display module provided in the fifth embodiment of this disclosure.

[0084] Figure 14B is another schematic diagram of the display module provided in the fifth embodiment of this disclosure.

[0085] Figure 14C is another schematic diagram of the display module provided in the fifth embodiment of this disclosure.

[0086] Figure 15 shows the illuminance distribution and illuminance curve of the display module shown in Figure 14A in the non-display state.

[0087] Figure 16 shows the illuminance distribution and illuminance curve of the display module shown in Figure 14A in the display state.

[0088] Figure 17 is a schematic diagram of the display module provided in the sixth embodiment of this disclosure.

[0089] Figure 18A shows the illuminance distribution and illuminance curve of the display module shown in Figure 17 in the non-display state.

[0090] Figure 18B shows the illuminance distribution and illuminance curve of the display module shown in Figure 17 in the display state.

[0091] Figure 19 is a schematic diagram of the display module provided in the seventh embodiment of this disclosure.

[0092] Figure 20 is a schematic diagram of a display device provided in some embodiments of this disclosure.

[0093] Figure 21 is a cross-sectional view along line A-A' in Figure 20. Detailed Implementation

[0094] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0095] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0096] Unless otherwise defined, the technical or scientific terms used in the embodiments of this disclosure should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0097] As used herein, “parallel” and “perpendicular” include the described situation and situations that are similar to the described situation, within an acceptable range of deviation, which is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, “parallel” includes absolute parallelism and approximate parallelism, where an acceptable range of deviation for approximate parallelism may be, for example, within 5°; “perpendicular” includes absolute perpendicularity and approximate perpendicularity, where an acceptable range of deviation for approximate perpendicularity may also be, for example, within 5°.

[0098] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can mean that the layer or element is directly on the other layer or substrate, or that there is an intermediate layer between the layer or element and the other layer or substrate.

[0099] This document describes exemplary embodiments with reference to sectional views and / or plan views, which are idealized exemplary drawings. In the drawings, the thickness of layers and regions is enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Therefore, exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes. Thus, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the regions of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0100] In recent years, Micro LED has inherited the high efficiency, high brightness, high reliability and fast response time of inorganic LED. This self-emissive characteristic has the advantages of energy saving, simple structure, small size and thinness. Therefore, it has a wide range of applications in transparent display modules to improve the transmittance of display modules.

[0101] In some display modules requiring large screen displays, multiple transparent display substrates need to be spliced ​​together to achieve a large-size display. Generally, transparent display modules requiring splicing are 20 inches or larger, with the size of a single display substrate ranging from 10 to 18 inches. The specific size can be determined by splicing multiple display substrates together according to actual size requirements to achieve the desired spliced ​​display size.

[0102] Because the splicing process requires a certain level of precision, a gap is usually left between adjacent display substrates to prevent collisions during splicing. The presence of air in this gap results in a significant brightness difference at the gap location from a wide viewing angle, making the gap appear particularly noticeable.

[0103] Figure 1A is a schematic diagram illustrating the principle of creating a visually visible seam in a display module. As shown in Figure 1A, the display module includes multiple display substrates 10, with a gap V between adjacent display substrates 10. When the display module is in a non-display state (i.e., without a displayed image), natural light emitted by an ambient light source LS illuminates the display substrates 10. Unlike non-transparent display modules, in transparent display modules, natural light undergoes refraction and total internal reflection within the display substrates 10. Especially for large-angle light, total internal reflection occurs, causing some light to exit from the display substrates 10 towards the side of the gap V instead of exiting on the front surface of the screen. This results in the human eye perceiving a difference in brightness at the gap V compared to other locations.

[0104] Figure 1B is a schematic diagram illustrating the principle of light leakage at the gap position in the display module. As shown in Figure 1B, the display module includes multiple display substrates 10. Each display substrate 10 includes a transparent base 11 and a light-emitting device 12 located on the transparent base 11. There is a gap V between adjacent transparent bases 11. When the display substrate 10 is lit, at the gap V, a portion of the light from the light-emitting device 12 is reflected or refracted on the side of the transparent base 11 facing the gap V, and exits the display module at the position corresponding to the gap V. At other positions outside the gap V, the light is not reflected or refracted by the side of the transparent base 11. The transparent base 11 is equivalent to a waveguide structure with a uniform refractive index. Therefore, a portion of the light is reflected inside the transparent base 11, and the other portion exits the display module 10 uniformly. Therefore, due to the existence of the gap V, the user will see a higher brightness at the splicing point of adjacent display substrates 10 (i.e., light leakage problem).

[0105] The following simulations of the illuminance data at various locations of the display module are shown in Figures 2A to 4B. Figure 2A shows a plan view of the gapless display module and a side view of the gapless display module viewed from a 60° viewing angle. Figure 2B shows the illuminance distribution and illuminance curve of the gapless display module in its non-display state. The illuminance data in Figure 2B was obtained at a 60° viewing angle (see the viewing position in Figure 2A). Figure 2C shows the illuminance distribution and illuminance curve of the gapless display module in its display state. The illuminance data in Figure 2C was obtained at a vertical viewing angle. Figure 3 shows a plan view of the gapped display module and a side view of the gapped display module viewed from a 60° viewing angle. Figure 4A shows the illuminance distribution and illuminance curve of the gapped display module in its non-display state. Figure 4B shows the illuminance distribution and illuminance curve of the gapped display module in its display state. In Figure 3, the display module 1 with gaps includes multiple display substrates 10, and the gap V between adjacent display substrates 10 is approximately 100 μm wide. The transparent substrate of the display substrate 10 is made of glass. In various embodiments of this disclosure, each display substrate 10 includes a transparent substrate 11 and multiple light-emitting devices 12 located on one side of the transparent substrate 11. When acquiring illuminance data of the display module 1 in a non-display state, the viewing position is located on the side of the transparent substrate 11 where the light-emitting devices 12 are located, the viewing angle is 60°, and the viewing position remains fixed. When acquiring illuminance data of the display module 1 in a display state, the viewing position is located on the side of the transparent substrate 11 away from the light-emitting devices 11 and directly opposite the gap, and the viewing position remains fixed. The horizontal axis of the illuminance distribution diagram represents the coordinates of each position in the display module 1 in the horizontal direction (X direction), and the vertical axis represents the coordinates of each position in the display module in the vertical direction (Y direction). For a display module 1 without gaps, the origin of the illuminance distribution diagram is the center of the display module; for a display module with gaps, the origin of the illuminance distribution diagram is the midpoint of the gap between two adjacent display substrates 10, and the gap extends along the Y-axis direction. It should be noted that the illuminance distribution diagrams in the embodiments of this disclosure are all simulation data. The size of the illuminance distribution diagram does not represent the actual size of the display module, but is a simulation after scaling up the display module. For example, for the display module 1 with gaps, the size of a single display substrate 10 is 2500 micrometers × 2500 micrometers. The illuminance distribution diagram is obtained by scaling up the simulation results of the two display substrates 10 to 8 micrometers × 8 micrometers. Similarly, for the display module 1 with gaps, its size is the sum of the sizes of the two display substrates 10, that is, 5000 micrometers × 2500 micrometers. The simulation result is also scaled up to 8 micrometers × 8 micrometers.

[0106] In the simulation results of the various embodiments of this disclosure, the horizontal axis of illuminance curve 1 represents the lateral position of display module 1, and the vertical axis represents illuminance; the horizontal axis of illuminance curve 2 represents illuminance, and the vertical axis represents the longitudinal position of display module 1. Referring to Figures 2A to 2C, for the gapless display module 1, in the non-display state, since the light source LS is located on the left side of display module 1, the brightness of the entire display module 1 viewed from the right side at a large viewing angle decreases from left to right, which is consistent with the trend of reflected brightness change at a large viewing angle; in the display state, the brightness in the central region (e.g., the region with the horizontal axis in the range of -2 to 2 mm) is uniformly distributed without obvious brightness abrupt changes. Referring to Figures 3 to 4B, for the display module 1 with gap V, in the non-display state, the brightness of the entire display module 1, viewed from a wide viewing angle, suddenly decreases from left to right, then slowly rises back to normal brightness. This sudden drop in brightness is perceptible to the human eye, resulting in a noticeable seam. In the display state, the brightness of the display module 1 shows a significant increase in the gap V and its adjacent area, forming a large peak, indicating light leakage at the gap V. In the simulation results of the various embodiments of this disclosure, the gap V and its adjacent area refer to the region with an abscissa ranging from -2 to 2 millimeters.

[0107] This disclosure provides a display module. Figure 5A is a schematic diagram of a display module provided in some embodiments of this disclosure, and Figure 5B is a schematic diagram of a transparent substrate 11 and an adjacent first filling layer 30 in Figure 5A. As shown in Figures 5A and 5B, the display module includes multiple display substrates 10 arranged in an array and independent of each other. It should be noted that "array arrangement" in this disclosure includes the case of m×n, as well as the cases of 1×n and m×1, where m and n are both integers greater than 1; in addition, "independent of each other" in this disclosure means that there are clear structural boundaries between the display substrates 10, rather than regional divisions on a large display substrate.

[0108] The display substrate 10 includes a transparent substrate 11 and a plurality of light-emitting devices 12 disposed on the transparent substrate 11. The light-emitting devices 12 include, for example, Micro-LED chips or Mini-LED chips. A gap exists between adjacent display substrates 10. The display module 1 also includes a transparent support substrate 20, with the plurality of display substrates 10 located on the same side of the transparent support substrate 20. For example, the transparent support substrate 20 serves as a carrier plate, in which case the transparent substrate 11 of the display substrate 10 is located between the light-emitting devices 12 and the transparent support substrate 20; or, for another example, the transparent support substrate 20 serves as a cover plate, in which case the transparent substrate 11 is located on the side of the light-emitting devices 12 away from the transparent support substrate 20. It should be noted that "transparent" in this embodiment refers to a high transmittance of visible light, for example, above 90% or above 95%. In one example, the transparent substrate 11 and the transparent support substrate 20 can be made of glass or organic materials such as polyimide (PI).

[0109] The transparent support substrate 20 is continuously distributed across the gaps, meaning that the orthographic projection of the gaps onto the extended surface of the transparent support substrate 20 lies within the transparent support substrate 20. Furthermore, the orthographic projections of the plurality of light-emitting devices 12 of each display substrate 10 onto the extended surface of the transparent support substrate 20 all lie within the support substrate 20. For example, the transparent support substrate 20 may be continuously distributed across its entire surface.

[0110] The display module 1 also includes a first filling layer 30, which is located at least in the gap.

[0111] In this embodiment, the display substrates 10 are arranged in an array. Both the transparent substrate 11 and the transparent support substrate 20 of the display substrates 10 are transparent, making them suitable for use in transparent splicing display modules. Furthermore, the transparent support substrates 20 are continuously distributed at the gaps between the transparent substrates 11, thus providing support for adjacent display substrates 10 and ensuring the stability of the transparent splicing display module. Additionally, a first filling layer 30 is provided between adjacent transparent substrates 11, thereby improving the splicing seam problem that occurs in the non-display state and the light leakage problem that occurs in the display state due to air gaps, thereby improving the overall visual consistency of the transparent splicing display module in both the non-display and display states.

[0112] In one example, the first filler layer 30 can be formed by inkjet printing and curing.

[0113] In some embodiments, the width of the gap is in the range of 50 micrometers to 300 micrometers to prevent obvious discontinuities in the display images of adjacent display substrates 10 at the gap position. For example, the width of the gap is in the range of 50 micrometers to 200 micrometers; for another example, the width of the gap is in the range of 100 micrometers to 200 micrometers; for yet another example, the width of the gap is in the range of 100 micrometers to 300 micrometers.

[0114] In some embodiments, the refractive index n1 of the first filling layer 30 and the refractive index n2 of the transparent substrate 11 satisfy: 0.99≤n1 / n2≤1.06, so that the refractive indices of the first filling layer 30 and the transparent substrate 11 are approximately equal, so that the reflection degree of light at the gap position and the transparent substrate 11 is approximately the same. This is equivalent to multiple transparent substrates 11 and the first filling layer 30 forming the same dielectric plate with the same refractive index. When natural light shines on the display substrate 10, it can normally be emitted from the front of the dielectric plate, instead of emitting from the interface between the two media at the side position, thereby further reducing the problem of sudden brightness drop at the gap when the display module is in the non-display state. Furthermore, when the display module is in the display state, the light from the light-emitting device 12 will not be emitted from the interface between the two media at the side position, thereby further reducing the problem of light leakage at the gap when the display module is in the display state, and thus further improving the visual consistency of the transparent splicing display module in the non-display state and the visual consistency in the display state.

[0115] For example, the transparent substrate 11 is made of glass, in which case the refractive index n1 of the first filling layer 30 in the gap is between 1.5 and 1.6. For example, the refractive index of the transparent substrate 11 is 1.51, and the refractive index of the first filling layer 30 is 1.5 to 1.53, or 1.53 to 1.55, or 1.55 to 1.6.

[0116] In some embodiments, as shown in FIG5B, the transparent substrate 11 includes a first surface S1 that carries the light-emitting device 12, a second surface S2 that faces away from the first surface S1, and a side surface S3 located between the first surface S1 and the second surface S2.

[0117] Among them, for the opposite sides S3 of two adjacent display substrates 10, the first filling layer 30 is continuously distributed along the side from the first side S1 to the second side S2, which helps the first filling layer 30 to fully fill the gap between the two adjacent transparent substrates 11 and improve the overall visual consistency of the transparent splicing display module.

[0118] In some embodiments, as shown in Figures 5A and 5B, the transparent support substrate 20 is located on the side of the second surface S2 away from the first surface S1, and is used to support a plurality of display substrates 10. In the thickness direction of the transparent substrate 11, the maximum distance from the first filling layer 30 to the transparent support substrate 20 is less than or equal to the distance from the surface of the light-emitting device 12 away from the second surface S2 to the transparent support substrate 20, that is, the top of the first filling layer 30 is not higher than the top of the light-emitting device 12, so as to prevent the first filling layer 30 from being clearly seen when viewing the display module at a small viewing angle.

[0119] In some embodiments, as shown in FIG5A, the orthographic projection of the first filling layer 30 on the transparent support substrate 20 does not overlap with the orthographic projection of any light-emitting device 12 on the transparent support substrate 20.

[0120] In some embodiments, as shown in FIG5A, the maximum distance between the surface of the first filling layer 30 on the side closer to the first surface S1 in the thickness direction of the transparent substrate 11 (i.e., the top surface of the first filling layer 30 in FIG5A and FIG5B) and the first surface S1 does not exceed 2 micrometers, so as to reduce the height difference between the top surface of the first filling layer 30 and the first surface S1 and prevent significant changes in brightness at the gap position. For example, the top surface of the first filling layer 30 is flush with the first surface S1.

[0121] The top surface of the first filling layer 30 can be either a plane or a curved surface.

[0122] Figure 6A shows the illuminance distribution curves in the non-display state of the display module provided in some embodiments of this disclosure when using a first filling layer 30 with different refractive indices. The display module is the one shown in Figure 5A, with a first filling layer 30 disposed in the gap between two adjacent transparent substrates 11. The top surface of the first filling layer 30 is substantially flush with the first surface S1 of the two adjacent transparent substrates 11. Each illuminance curve in Figure 6A represents the illuminance curve 3 at various positions when the display module 1 is in the non-display state. The transparent substrate 11 is made of glass. The horizontal axis in Figure 6A represents the abscissa of each position of the display module; the vertical axis represents the illuminance. It should be noted that Figure 5A schematically shows three display substrates 10. When simulating to obtain the illuminance distribution map and illuminance curves, the simulation is performed on a display module containing two display substrates 10. The dimensions of a single display substrate 10 are as described above. The origin of the illuminance distribution map is the center position of the gap between the two display substrates 10, which extends along the Y-axis. During simulation, the gap width is set to 100 micrometers. The horizontal coordinate of the gap position is 0, the horizontal coordinates of each position to the left of the gap are negative, and the horizontal coordinates of each position to the right of the gap are positive. The relationship between the light source, display module 1, and viewing position is shown in Figure 3. Comparing Figures 4A and 6A, it can be seen that when the refractive index of the first filling layer 30 is less than 1.1, the illuminance near the gap will decrease significantly. When the refractive index of the first filling layer 30 is 1.5 or 1.6, since the refractive index of the first filling layer 30 is basically the same as that of the transparent substrate 11, the illuminance curve changes gently. It can be seen that filling the gap with a first filling layer 30 with a refractive index of 1.5 to 1.6 can prevent visually visible seams between adjacent display substrates 10, thereby improving the overall visual consistency of the transparent splicing display module in the non-display state.

[0123] Figure 6B shows the illuminance distribution and illuminance curve of the display module shown in Figure 5A in display mode. During simulation, the gap width was set to 100 micrometers. The horizontal axis of the gap position is 0, with negative values ​​for positions to the left of the gap and positive values ​​for positions to the right. The viewing position is located on the side of the transparent substrate 11 furthest from the light-emitting device 12, directly opposite the gap. Furthermore, during simulation, the refractive index of the first filling layer 30 was set to the range of 1.5 to 1.6. Compared to Figure 4B, in Figure 6B, the brightness difference in the gap and its adjacent area is smaller, and the resulting peaks are smaller. This demonstrates that setting the first filling layer 30 with a refractive index of 1.5 to 1.6 in the gap can improve light leakage.

[0124] Figure 7A is a schematic diagram of a display module provided in a second embodiment of this disclosure, and Figure 7B is an exploded view of the two transparent substrates 11 and a first filling layer 30 in Figure 7A. The display module shown in Figure 7A is similar to the display module shown in Figure 5A, both including multiple display substrates 10, transparent support substrates 20, and a first filling layer 30. The first filling layer 30 is located at least in the gaps. Optionally, the width of the gaps is in the range of 50 micrometers to 300 micrometers.

[0125] Optionally, the refractive index n1 of the first filling layer 30 and the refractive index n2 of the transparent substrate 11 satisfy the condition: 0.99 ≤ n1 / n2 ≤ 1.06. For example, the transparent substrate 11 is made of glass; the display module also includes a first filling layer 30 located in the gap, and the refractive index n1 of the first filling layer 30 is between 1.5 and 1.6.

[0126] Optionally, the transparent substrate 11 includes a first surface S1 supporting the light-emitting device 12, a second surface S2 facing away from the first surface S1, and a side surface located between the first surface S1 and the second surface S2; wherein, for the opposite sides of two adjacent display substrates 10, the first filling layer 30 is continuously distributed along the side surface from the first surface S1 to the second surface S2. Optionally, the transparent support substrate 20 is located on the side of the second surface S2 away from the first surface S1.

[0127] The difference between this and the display module shown in Figure 5A is that, in Figure 7A, the multiple display substrates 10 include adjacent first display substrates 101 and second display substrates 102. Near the edge of the gap (here, the edge refers to the edge S11 of the first surface S1 near the display gap), the distance from the first surface S1 of the first display substrate 101 to the transparent support substrate 20 is greater than the distance from the first surface S1 of the second display substrate 102 to the transparent support substrate 20. That is, there is a step difference between the adjacent edges of two adjacent transparent substrates 11.

[0128] The first filling layer 30 between the first display substrate 101 and the second display substrate 102 includes opposing first edges E1 and second edges E2 away from the surface of the transparent support substrate 20. The first edge E1 is connected to the first surface S1 of the first display substrate 101, and the second edge E2 is connected to the first surface S1 of the second display substrate 102. Along the direction from the first edge E1 to the second edge E2, the distance between the surface of the first filling layer 30 away from the transparent support substrate 20 and the transparent support substrate 20 gradually decreases. This arrangement fills the gap between two adjacent transparent substrates 11, preventing visually visible seams.

[0129] In one example, in the thickness direction of the transparent substrate 11, the distance from the first edge E1 to the transparent substrate 11 is equal to the distance from the first surface S1 of the first display substrate 101 to the transparent substrate 11; the distance from the second edge E2 to the transparent substrate 11 is equal to the distance from the first surface S1 of the second display substrate 102 to the transparent substrate 11. That is, the first edge E1 is in direct contact with the first surface S1 of the first display substrate 101; the second edge E2 is in direct contact with the first surface S1 of the second display substrate 102. For example, the first edge E1 may coincide with the edge of the first surface S1 of the first display substrate 101, or the first edge E1 may fall inside the first surface S1; the second edge E2 may coincide with the edge of the first surface S1 of the second display substrate 102; or the second edge E2 may fall inside the second surface S2.

[0130] Figure 8A is a schematic diagram of the display module in Comparative Example 1. The display module 1 in Comparative Example 1 is similar to the display module 1 in Figure 7A, except that in Comparative Example 1, there is no first filling layer 30 between adjacent display substrates 10. Figure 8B shows the illuminance distribution and illuminance curve of the display module shown in Figure 8A in the non-display state. Figure 8C shows the illuminance distribution and illuminance curve of the display module shown in Figure 7A in the non-display state. Figures 8B and 8C are both viewing data of a user at a 60° viewing angle to the right of the central axis of the display module 1 in natural light environment when the display module 1 is not displaying an image. For the specific viewing position, please refer to Figure 3. When simulating the display module of Figure 7A, the material of the transparent substrate 11 is glass, and the refractive index of the first filling layer 30 is between 1.5 and 1.6. As can be seen from Figures 8B and 8C, when there is a step difference between adjacent display substrates 10 and the first filling layer 30 is not provided in the gap, the user will see a significant decrease in brightness at the gap position (in a trough state); while for the display module shown in Figure 7A, the illuminance at the gap position transitions smoothly, thereby weakening the visually visible splicing seam.

[0131] Figure 9 is a schematic diagram of a display module provided in the third embodiment of this disclosure. The display module shown in Figure 9 is similar to that in Figure 5A, except that the display module 1 in Figure 9 may further include a second filling layer 50. The second filling layer 50 is located on the side of the light-emitting device 12 away from the transparent substrate 11 and is continuously distributed. The orthographic projections of the multiple light-emitting devices 12 in the display module 1 onto the transparent substrate 11 are all within the orthographic projection range of the second filling layer 50 onto the transparent substrate 11. The second filling layer 50 includes a first portion 51 and a second portion 52. The first portion 51 is located on the side of the light-emitting device 12 away from the transparent substrate 11, and the second portion 52 is located between two adjacent light-emitting devices 12. The first filling layer 30 is in contact with the second filling layer 50. The second filling layer 50 can protect the light-emitting device 12 and prevent it from being squeezed by other structures above it.

[0132] In some embodiments, the refractive index n3 of the second filling layer 50 and the refractive index n2 of the transparent substrate 11 satisfy: 0.99≤n3 / n2≤1.06.

[0133] In some embodiments, as shown in FIG9, the second filling layer 50 and the first filling layer 30 can be an integral structure.

[0134] In some examples, as shown in FIG9, the transparent support substrate 20 is located on the side of the display substrate 10 away from the second filling layer 50, and the display module 1 also includes a transparent cover plate 40, which is located on the side of the second filling layer 50 away from the display substrate 10.

[0135] It should be noted that in some other examples, the transparent support substrate 20 can also be placed on the side of the second filling layer 50 away from the display substrate 10, so that it can be used as a cover plate. In this case, there is no need to set the transparent cover plate 40 separately.

[0136] Alternatively, for the embodiment shown in Figure 7A, a second filling layer 50 and a transparent cover plate 40 can also be provided, which is similar to that in Figure 9 and will not be described in detail here.

[0137] Figure 10 is a schematic diagram of the display module provided in the fourth embodiment of this disclosure. The display module shown in Figure 10 is similar to that in Figure 5A. The differences between the two will be described below.

[0138] In Figure 10, the refractive index n1 of the first filling layer 30 and the refractive index n2 of the transparent substrate 11 satisfy 0.73 ≤ n1 / n2 < 0.99. The first filling layer 30 includes a transparent substrate 31, and the display module 1 also includes diffusing particles 32 distributed in the transparent substrate 31. The transparent substrate 31 and the diffusing particles 32 constitute the first filling layer 30. The diffusing particles 32 are used to scatter visible light. When 0.73 ≤ n1 / n2 < 0.99, the refractive index of the first filling layer 30 differs somewhat from the refractive index of the transparent substrate 11, but this difference is smaller than the difference between the refractive index of the transparent substrate 11 and air. Therefore, when 0.73 ≤ n1 / n2 < 0.99, the splicing seam problem of the display module 1 in the non-display state can be improved to a certain extent.

[0139] In addition, when the display module is in the display state, since the first filling layer 30 contains diffusion particles 32, the light irradiated by the light-emitting device 12 to the gap position can be dispersed by the diffusion particles 32, thereby improving the light leakage problem generated by the display module 1 at the gap position.

[0140] In one example, the transparent substrate 11 is made of glass, in which case the refractive index of the first filling layer 30 in the gap is between 1.1 and n1 < 1.5. For example, the refractive index of the transparent substrate 11 is 1.51, and the refractive index of the first filling layer 30 is 1.1 to 1.3, or 1.3 to 1.45, or greater than 1.45 and less than 1.5.

[0141] In one example, the material of the diffused particles 32 may include, but is not limited to, silicon-based particles.

[0142] In one example, the overall transmittance of the first filling layer 30, which includes a transparent substrate 31 and diffuse particles 32, is greater than or equal to 94% to ensure the overall transparency of the display module.

[0143] In the embodiment shown in Figure 10, the transparent substrate 11 is made of glass, and the refractive index n1 of the first filling layer 30 satisfies: 1.1 ≤ n1 < 1.5. It should be noted that, in the embodiment shown in Figure 10, n1 refers to the overall refractive index of the transparent substrate 31 and the diffused particles 32 doped therein.

[0144] The distribution area of ​​the first filling layer 30 in Figure 10 can be referred to the setting method in Figure 5A. Specifically, for the opposite sides S3 of two adjacent display substrates 10, the first filling layer 30 is continuously distributed along the side from the first side S1 to the second side S2, which is conducive to the first filling layer 30 fully filling the gap between two adjacent transparent substrates 11 and improving the overall visual consistency of the splicing display module.

[0145] Furthermore, in Figure 10, the orthographic projection of the first filling layer 30 onto the transparent support substrate 20 does not overlap with the orthographic projection of any light-emitting device 12 onto the transparent support substrate 20. The maximum distance between the surface of the first filling layer 30 near the first surface S1 in the thickness direction of the transparent substrate 11 and the first surface S1 does not exceed 2 micrometers, in order to reduce the height difference between the top surface of the first filling layer 30 and the first surface S1 and prevent significant changes in brightness at the gap position. For example, the top surface of the first filling layer 30 is flush with the first surface S1. The top surface of the first filling layer 30 can be a plane.

[0146] In addition, when there is a step difference between the two adjacent edges of two adjacent transparent substrates 11, the shape and coverage area of ​​the first filling layer 30 can be set in the manner shown in Figures 7A and 7B, so as to fully fill the gap between the two adjacent transparent substrates 11.

[0147] Figure 11 is another schematic diagram of the display module provided in the fourth embodiment of this disclosure. The display module shown in Figure 11 is similar to that in Figure 10, except that it also includes a second filling layer 50. The second filling layer 50 is located on the side of the light-emitting device 12 away from the transparent substrate 11 and is continuously distributed. The orthographic projections of multiple light-emitting devices 12 in the display module onto the transparent substrate 11 are all within the orthographic projection range of the second filling layer 50 onto the transparent substrate 11. The second filling layer 50 includes a first part 51 and a second part 52. The first part 51 is located on the side of the light-emitting device 12 away from the transparent substrate 11, and the second part 52 is located between two adjacent light-emitting devices 12. The first filling layer 30 is in contact with the second filling layer 50. The second filling layer 50 can protect the light-emitting device 12 and prevent it from being squeezed by other structures above it.

[0148] In some embodiments, the refractive index n3 of the second filling layer 50 and the refractive index n2 of the transparent substrate 11 satisfy: 0.99≤n3 / n2≤1.06, thereby further improving the consistency of the overall visual effect of the display module.

[0149] In some examples, as shown in FIG11, the transparent support substrate 20 is located on the side of the display substrate 10 away from the second filling layer 50, and the display module 1 also includes a transparent cover plate 40, which is located on the side of the second filling layer 50 away from the display substrate 10.

[0150] Figure 12 is another schematic diagram of the display module provided in the fourth embodiment of this disclosure. The display module shown in Figure 12 is similar to that in Figure 11, except that in Figure 12, the transparent support substrate 20 is located on the side of the second filling layer 50 away from the transparent substrate 11. In this case, there is no need to provide a cover plate 40.

[0151] Figure 13A shows the illuminance distribution and illuminance curve of the display module shown in Figure 10 in the display state. During the simulation, the transparent substrate 11 in Figure 10 is made of glass with a refractive index of 1.51; the refractive index of the first filling layer 30 is set to 1.3, and the gap width is set to 100 micrometers. Figure 13B shows the illuminance distribution and illuminance curve of the display module in Comparative Example 2 in the display state. The display module in Comparative Example 2 is similar to the display module in Figure 10, except that the refractive index of the first filling layer 30 in Comparative Example 2 is 1.3, but it does not contain doped particles. Although the display modules in Figure 10 schematically show three display substrates 10, the simulation to obtain the illuminance distribution and illuminance curve is performed on a display module containing two display substrates 10. The dimensions of a single display substrate 10 are as described above. The origin of the illuminance distribution is the center of the gap between the two display substrates 10, and the gap extends along the Y-axis.

[0152] Referring to Figure 2C, for the gapless display module 1, the brightness is highest in the center during display, gradually decreasing from the center to the edge; the brightness change is relatively gradual in the central region (e.g., the area with the horizontal axis between -2 and 2 mm). Comparing Figures 2C, 4B, and 13B, it can be seen that when there is a certain difference between the refractive index n1 of the first filling layer 30 and the refractive index n2 of the transparent substrate 11 (0.73 ≤ n1 / n2 < 0.99), and no diffusion particles 32 are provided, the brightness of the display module 1 will increase in the gap and its adjacent area. The degree of brightness change is less than that of the gapped display module 1 shown in Figure 3; that is, the display module of Comparative Example 2 still has a certain amount of light leakage at the gap position, but the degree of light leakage is less than that of the gapped product. Comparing Figures 2C, 4B, and 13A, it can be seen that when there is a certain difference between the refractive index n1 of the first filling layer 30 and the refractive index n2 of the transparent substrate 11, and when the diffuser particles 32 are provided, the brightness change of the display module 1 in the gap and its adjacent area is small. Therefore, in this embodiment of the present disclosure, by providing diffuser particles 32 in the first filling layer 30, the light leakage problem occurring at the gap position can be improved.

[0153] Figure 14A is a schematic diagram of a display module provided in the fifth embodiment of this disclosure. The display module 1 shown in Figure 14A is similar to that in Figure 5A. The differences between Figure 14A and Figure 5A will be described below. In Figure 14A, the surface of the first filling layer 30 near the first surface S1 in the thickness direction of the transparent substrate 11 is convex. The maximum distance between the convex surface and the transparent support substrate 20 is less than or equal to the distance between the surface of the light-emitting device 12 away from the transparent support substrate 20 and the transparent support substrate 20. For the opposite sides of two adjacent display substrates 10, the first filling layer 30 is continuously distributed along the side from the first surface S1 to the second surface S2.

[0154] In the embodiment shown in Figure 14A, unlike in Figure 5A, the refractive index n1 of the first filling layer 30 and the refractive index n2 of the transparent substrate 11 satisfy: 0.73≤n1 / n2<0.99.

[0155] In Figure 14A, when 0.73 ≤ n1 / n2 < 0.99, the refractive index of the first filling layer 30 differs somewhat from that of the transparent substrate 11. However, this difference is smaller than the difference between the refractive index of the transparent substrate 11 and air. Therefore, when 0.73 ≤ n1 / n2 < 0.99, the splicing seam problem of the display module 1 in the non-display state can be improved to a certain extent. In addition, by making the surface of the first filling layer 30 away from the transparent support substrate 20 convex, some large-angle light can be reflected or refracted at the convex surface, thereby scattering the light and improving the problem of light leakage at the gap position of the display module 1.

[0156] In some embodiments, as shown in FIG14A, the first filling layer 30 includes a protrusion 31, which is the portion of the first filling layer 30 that is higher than the first surface S1 relative to the second surface S2 in the thickness direction of the transparent substrate 11. The surface of the protrusion 31 near the first surface S1 in the thickness direction of the transparent substrate 11 is convex. The orthographic projection of the protrusion 31 on the transparent support substrate 20 overlaps with the orthographic projection of the first surfaces of the two adjacent display substrates 10 corresponding to the first filling layer 30 on the transparent support substrate 20, which is more conducive to the first filling layer 30 blocking light at large angles and reducing the problem of light leakage at the gap position.

[0157] In some embodiments, when the surface of the first filling layer 30 away from the transparent support substrate 20 is convex, the orthographic projection of the first filling layer 30 on the transparent support substrate 20 does not overlap with the orthographic projection of any light-emitting device 12 on the transparent support substrate 20, so as to prevent the coverage area of ​​the first filling layer 30 from being too large and affecting the normal light emission of the light-emitting device 12.

[0158] Optionally, in Figure 14A, the side of the transparent substrate 11 facing the gap can be designated as a hydrophobic surface; or, the area of ​​the first surface S1 near the gap can be designated as a hydrophobic region; or both methods can be combined, i.e., the side of the transparent substrate 11 facing the gap can be designated as a hydrophobic surface, while the area of ​​the first surface S1 near the gap can be designated as a hydrophobic region. By setting a hydrophobic surface and / or a hydrophobic region, it is more beneficial for the first filling layer 30 to form the aforementioned convex surface.

[0159] Alternatively, in Figure 14A, diffuse particles 32 can also be provided in the first filling layer 30 to further scatter the light in the gap and further reduce the problem of light leakage at the gap location.

[0160] Figure 14B is another schematic diagram of the display module provided in the fifth embodiment of this disclosure. Figure 14B is similar to Figure 14A, except that in Figure 14B, the display module further includes a transparent cover plate 40 and a second filling layer 50 located between the transparent cover plate 40 and the display substrate 10. In Figure 14B, the refractive indices of the first filling layer 30 and the second filling layer 50 are different. For example, the refractive index of the second filling layer 50 is less than the refractive index of the first filling layer 30, or the refractive index of the second filling layer 50 is greater than the refractive index of the first filling layer 30.

[0161] Figure 14C is another schematic diagram of the display module provided in the fifth embodiment of this disclosure. Figure 14C is similar to Figure 14B, except that in Figure 14C, the transparent cover plate 40 is not provided, but the transparent support substrate 20 is provided on the side of the second filling layer 50 away from the display substrate 10.

[0162] Figure 15 shows the illuminance distribution and illuminance curve of the display module shown in Figure 14A in the non-display state. In the illuminance simulation, the transparent substrate 11 is made of glass, and the overall refractive index of the first filling layer 50 is 1.3. The simulation process is the same as the simulation process in the non-display state described above, and the correspondence between the coordinate axes and the display module in the illuminance simulation graph is the same as in the above embodiment. Figure 16 shows the illuminance distribution and illuminance curve of the display module shown in Figure 14A in the display state. Comparing Figures 2B, 4A, and 15, it can be seen that in the non-display state, the illuminance of the display module 1 in Figure 14A at the gap position does not show the sudden decrease trend seen in Figure 4A, but rather a slow decrease trend similar to Figure 2B. Therefore, the display module 1 in Figure 14A can improve the problem of visible splicing seams. Comparing Figures 2C, 4B, and 16, it can be seen that in the display state, the brightness change of the display module in Figure 14A in the gap and its adjacent area is small. Therefore, by setting a first filling layer 30 with a convex surface in the gap, the light leakage problem that occurs at the gap position can be improved.

[0163] Figure 17 is a schematic diagram of a display module provided in the sixth embodiment of this disclosure. As shown in Figure 17, the display module includes multiple display substrates 10 arranged in an array and independent of each other. Each display substrate 10 includes a transparent substrate 11 and multiple light-emitting devices 12 disposed on the transparent substrate 11. There is a gap between two adjacent display substrates 10. The display module also includes a transparent support substrate 20, and the multiple display substrates 10 are all located on the same side of the transparent support substrate 20. The transparent support substrate 20 is continuously distributed across the gap, and the orthographic projection of the multiple light-emitting devices 12 of each display substrate 10 onto the extension surface of the transparent support substrate 20 is located within the transparent support substrate 20. The transparent substrate 11 includes a first surface S1 that carries the light-emitting devices 12, a second surface S2 that faces away from the first surface S1, and a side surface located between the first surface S1 and the second surface S2. The opposite side surfaces S3 of two adjacent display substrates 10 are inclined surfaces with the same inclination direction, and the inclined surfaces intersect the thickness direction of the transparent substrate 11. As shown in Figure 17, the phrase "the two inclined surfaces have the same inclination direction" means that the first surface S1 of the transparent substrate 11 points towards the second surface S2, and the horizontal distances from both inclined surfaces to the same edge of the transparent support substrate 20 (e.g., the left edge in Figure 17) either gradually increase or gradually decrease. That is, both inclined surfaces are either " / " shaped or "\" shaped.

[0164] The acute angles formed between the two inclined planes with the same inclination direction and the transparent support substrate 20 can be the same or slightly different. The acute angles formed between the inclined planes and the transparent support substrate 20 can be in the range of 30° to 60°.

[0165] In the display module shown in Figure 17, the opposite sides of two adjacent display substrates 10 are set as inclined surfaces. When the display module 1 is in a non-display state and in a natural light environment, the incident angle of light from the inside of the transparent substrate 11 to the inclined side is smaller than that of the vertical side. This allows light to exit from the inclined surface and enter the transparent substrate 11 from another inclined surface, reducing the light emitted from the gap. This reduces the impact of the gap on the brightness of the light, so that the brightness of the gap and the light on both sides of the gap changes smoothly as seen by the human eye, without any sudden drop. That is, no obvious splicing gap is visible.

[0166] In one example, the opposing inclined planes of two adjacent display substrates 10 are parallel to each other, and the vertical distance between the two opposing inclined planes is in the range of 50 micrometers to 300 micrometers. For example, the vertical distance is in the range of 50 micrometers to 200 micrometers; another example, the vertical distance is in the range of 100 micrometers to 200 micrometers; yet another example, the vertical distance is in the range of 100 micrometers to 300 micrometers. The vertical distance between the two inclined planes refers to the distance between the intersection point of the perpendicular line perpendicular to the two inclined planes and the two inclined planes.

[0167] It should be noted that, in the embodiments of this disclosure, the opposite inclined surfaces of the two display substrates 10 are "parallel to each other" meaning that the absolute value of the difference between the acute angles formed by the two inclined surfaces and the transparent support substrate 20 does not exceed 5°.

[0168] In one example, as shown in Figure 17, in the same display substrate 10, the orthographic projection of the light-emitting device 12 on the transparent support substrate 20 does not overlap with the orthographic projection of the inclined surface on the transparent support substrate 20, so as to prevent the thickness of the transparent substrate 11 from changing in the area corresponding to the light-emitting device 12, thereby ensuring stable support for the light-emitting device 12.

[0169] In one example, in the display substrate 10, the spacing between two adjacent light-emitting devices arranged along the first direction (here, the spacing refers to the center-to-center distance) is P1, and the width of the gap between two adjacent display substrates 10 arranged along the first direction is L. The first direction is a direction that extends along the display substrate 10 and is perpendicular to the direction of the gap. Then, the width W of the orthographic projection of the inclined surface onto the transparent support substrate 20 satisfies: W≤P1-L, to ensure that in the same display substrate 10, the orthographic projection of the light-emitting device 12 onto the transparent support substrate 20 does not overlap with the orthographic projection of the inclined surface onto the transparent support substrate 20.

[0170] In one example, when a side surface S3 of a transparent substrate 11 is not positioned opposite to other transparent substrates 11, the side surface S3 can be perpendicular to the first surface S1 and the second surface S2.

[0171] In one example, two light-emitting devices 12 located on opposite sides of the gap along its width direction and adjacent to the gap are respectively the first light-emitting device and the second light-emitting device. The first light-emitting device and the second light-emitting device can have the same or different emission colors. The distance P2 between the first light-emitting device and the second light-emitting device satisfies: 0.9*P3≤P2≤1.1*P3, where P3 is the distance between two adjacent light-emitting devices 10 in a single display substrate 10 that have the same emission color as the first light-emitting device and the second light-emitting device, respectively, and are arranged along the width direction of the gap. Here, P2 and P3 both refer to the closest distance.

[0172] Specifically, for two display substrates 10 arranged along the first direction, the width direction of the gap between them is the first direction, and P2 is the distance between two adjacent light-emitting devices 12 in a single display substrate 10 whose light-emitting colors are the same as the first light-emitting device and the second light-emitting device, respectively, and are arranged along the first direction; for example, if two light-emitting devices distributed on opposite sides of the gap and adjacent to the gap are a blue light-emitting device and a red light-emitting device, then P2 is specifically: the shortest distance between the blue light-emitting device and the red light-emitting device arranged along the first direction and adjacent to each other in a single display substrate 10.

[0173] For two display substrates 10 arranged along the second direction, the width of the gap between them is the second direction. P2 is the distance between two adjacent light-emitting devices 12 in a single display substrate 10, whose light-emitting colors are the same as the first light-emitting device and the second light-emitting device, respectively, and are arranged along the second direction. For example, if two light-emitting devices distributed on opposite sides of the gap and adjacent to the gap are a blue light-emitting device and a red light-emitting device, then P2 is specifically the shortest distance between the adjacent blue light-emitting device and the red light-emitting device arranged along the second direction in a single display substrate 10.

[0174] This arrangement ensures that the light-emitting devices 12 are evenly distributed throughout the entire display module, thereby improving display uniformity.

[0175] Figure 18A shows the illuminance distribution and illuminance curve of the display module shown in Figure 17 in the non-display state, and Figure 18B shows the illuminance distribution and illuminance curve of the display module shown in Figure 17 in the display state. During the simulation, the angle of the inclined plane in the display module was 45°, and the vertical distance between the two opposing inclined planes on either side of the gap was 100 micrometers. For the simulation process of Figure 17 and the correspondence between the coordinate axes and the display module, please refer to the description of the simulation process for the non-display state in the above embodiment. Comparing Figures 4A and 18A, it can be seen that when the display module shown in Figure 17 is in the non-display state, the illuminance in the gap between two adjacent display substrates 10 and its adjacent area is relatively stable, without the sudden decrease trend shown in Figure 4A. Therefore, setting the opposing sides of the two adjacent display substrates 10 as inclined planes helps to improve the visually visible splicing seam problem. Comparing Figures 4B and 18B, it can be seen that when the display module shown in Figure 17 is in display mode, the amount of brightness change in the gap and its adjacent area is reduced compared to Figure 4B. It can be seen that by setting the opposite sides of two adjacent display substrates 10 as inclined surfaces, it is beneficial to improve the light leakage problem in display mode.

[0176] Alternatively, in the embodiment shown in FIG17, a second filling layer 50 may be provided on one side of the display substrate 10. The second filling layer 50 is located on the side of the light-emitting device 12 away from the transparent substrate 11 and is continuously distributed. Furthermore, a transparent cover plate 40 may be provided on the side of the second filling layer 50 away from the transparent substrate 11; or, the transparent support substrate 20 may be provided on the side of the second filling layer 50 away from the transparent substrate 11, in which case the transparent cover plate 40 may not be additionally provided.

[0177] Figure 19 is a schematic diagram of a display module provided in the seventh embodiment of this disclosure. The display module shown in Figure 19 is similar to that in Figure 17. The opposite sides of two adjacent display substrates 10 are inclined surfaces with the same inclination direction, intersecting the thickness direction of the transparent substrate 11. "Inclination direction is the same" means that the first surface S1 of the transparent substrate 11 points towards the second surface S2, and the horizontal distances from both inclined surfaces to the same edge of the transparent support substrate 20 (e.g., the left edge in Figure 19) gradually increase or decrease. That is, both inclined surfaces are either " / " shaped or "\" shaped. The acute angles formed between the two inclined surfaces with the same inclination direction and the transparent support substrate 20 can be the same or have some differences. The acute angles formed between the inclined surfaces and the transparent support substrate 20 can be in the range of 30° to 60°.

[0178] In one example, in the display substrate 10, the distance between two adjacent light-emitting devices arranged along the first direction (here, the distance refers to the closest distance) is P1, and the width of the gap between two adjacent display substrates 10 arranged along the first direction is L. The first direction is a direction that extends along the display substrate 10 and is perpendicular to the direction of the gap. Then, the width W of the orthographic projection of the inclined surface onto the transparent support substrate 20 satisfies: W≤P1-L, to ensure that in the same display substrate 10, the orthographic projection of the light-emitting device 12 onto the transparent support substrate 20 does not overlap with the orthographic projection of the inclined surface onto the transparent support substrate 20.

[0179] In one example, when a side surface S3 of a transparent substrate 11 is not positioned opposite to other transparent substrates 11, the side surface S3 can be perpendicular to the first surface S1 and the second surface S2.

[0180] In one example, two light-emitting devices 12 located on opposite sides of the gap along its width direction and adjacent to the gap are respectively the first light-emitting device and the second light-emitting device. The first light-emitting device and the second light-emitting device can have the same or different emission colors. The distance P2 between the first light-emitting device and the second light-emitting device satisfies: 0.9*P3≤P2≤1.1*P3, where P3 is the distance between two adjacent light-emitting devices 10 in a single display substrate 10 that have the same emission color as the first light-emitting device and the second light-emitting device, respectively, and are arranged along the width direction of the gap. Here, P2 and P3 both refer to the closest distance.

[0181] Specifically, for two display substrates 10 arranged along the first direction, the width direction of the gap between them is the first direction, and P2 is the distance between two adjacent light-emitting devices 12 in a single display substrate 10 whose light-emitting colors are the same as the first light-emitting device and the second light-emitting device, respectively, and are arranged along the first direction; for example, if two light-emitting devices distributed on opposite sides of the gap and adjacent to the gap are a blue light-emitting device and a red light-emitting device, then P2 is specifically: the shortest distance between the blue light-emitting device and the red light-emitting device arranged along the first direction and adjacent to each other in a single display substrate 10.

[0182] For two display substrates 10 arranged along the second direction, the width of the gap between them is the second direction. P2 is the distance between two adjacent light-emitting devices 12 in a single display substrate 10, whose light-emitting colors are the same as the first light-emitting device and the second light-emitting device, respectively, and are arranged along the second direction. For example, if two light-emitting devices distributed on opposite sides of the gap and adjacent to the gap are a blue light-emitting device and a red light-emitting device, then P2 is specifically the shortest distance between the adjacent blue light-emitting device and the red light-emitting device arranged along the second direction in a single display substrate 10.

[0183] This arrangement ensures that the light-emitting devices 12 are evenly distributed throughout the entire display module, thereby improving display uniformity.

[0184] The difference between Figure 19 and Figure 17 is that, in Figure 19, the display module may further include a first filling layer 30, which is located at least in the gap between two adjacent transparent substrates 11.

[0185] In one example, the refractive index n1 of the first filling layer 30 and the refractive index n2 of the transparent substrate 11 satisfy: 0.99≤n1 / n2≤1.06. In this case, the problem of sudden brightness drop at the gap in the non-display state and the problem of light leakage at the gap in the display state can be further improved, thereby further improving the overall visual consistency of the display module in the non-display state and the visual consistency in the display state.

[0186] In Figure 19, the first filling layer 30 can either fully fill the gap or fill only a portion of it. Furthermore, the surface of the first filling layer 30 closest to the first surface S1 in the thickness direction of the transparent substrate 11 can be convex or planar. For example, as shown in Figure 14A, the first filling layer 30 can include a protrusion 31, where the surface of the protrusion 31 closest to the first surface S1 in the thickness direction of the transparent substrate 11 is convex.

[0187] In Figure 19, when the refractive index n1 of the first filling layer 30 and the refractive index n2 of the transparent substrate 11 satisfy 0.73 ≤ n1 / n2 < 0.99, the first filling layer 30 can also be doped with diffusing particles 32, thereby scattering the light entering the first filling layer 30 and improving the light leakage problem at the gap position. Alternatively, when 0.73 ≤ n1 / n2 < 0.99, the first filling layer 30 can also have a convex surface, as shown in the configuration in Figure 14A.

[0188] Additionally, as shown in Figure 19, a second filling layer 50 can also be provided. The second filling layer 50 is located on the side of the light-emitting device 12 away from the transparent substrate 11 and is continuously distributed. The orthographic projections of multiple light-emitting devices 12 in the display module onto the transparent substrate 11 are all within the orthographic projection range of the second filling layer 50 onto the transparent substrate 11. The second filling layer 50 includes a first portion 51 and a second portion 52. The first portion 51 is located on the side of the light-emitting device 12 away from the transparent substrate 11, and the second portion 52 is located between two adjacent light-emitting devices 12. The first filling layer 30 is in contact with the second filling layer 50. The refractive index n3 of the second filling layer 50 and the refractive index n2 of the transparent substrate 11 satisfy the following condition: 0.99 ≤ n3 / n2 ≤ 1.06.

[0189] Additionally, in Figure 19, a transparent cover plate 40 can be provided, located on the side of the second filling layer 50 away from the display substrate 10, and a transparent support substrate is located on the side of the display substrate 10 away from the second filling layer 50. Alternatively, the transparent support substrate can be located on the side of the second filling layer 50 away from the display substrate 10, in which case the transparent cover plate 40 is not required.

[0190] Figure 20 is a schematic diagram of a transparent display device provided in some embodiments of this disclosure. The transparent display device shown in Figure 20 is used as a transparent splicing display device, which includes a display module and a frame 60 as described in any of the above embodiments. The frame 60 is arranged around two opposite light-emitting surfaces of the display module and is connected to the display module. The two opposite light-emitting surfaces of the display module refer to the two surfaces of the display module that are arranged opposite to each other in the thickness direction.

[0191] The multiple display substrates 10 are arranged in one row and N columns, N rows and one column, two rows and N columns, or N rows and two columns, where N is a positive integer greater than 1. Each display substrate 10 includes driving leads for driving multiple light-emitting devices 12. The driving leads extend from the surface of the transparent substrate 11 near the light-emitting device 11, through the edge of each display substrate 10 near the frame 60. That is, each driving lead extends from its corresponding surface of the transparent substrate 11 near the light-emitting device 11 towards the edge of the display substrate 10 near the frame 60.

[0192] For example, the driving lead can be located on the surface of the transparent substrate 11 near the light-emitting device 11 and led out by bonding and / or electrically connecting to the driving circuit board (e.g., in the form of a flexible circuit board); or the driving lead can extend from the surface of the transparent substrate 11 near the light-emitting device 11 to the side of the transparent substrate 11 near the frame 60, where the driving lead is electrically connected to the driving circuit board; or the driving lead can extend from the surface of the transparent substrate 11 near the light-emitting device 11 toward the edge near the frame 60, cross the side of the transparent substrate 11 near the frame 60, continue to the side of the transparent substrate 11 away from the light-emitting device 11, and be electrically connected to the driving circuit board.

[0193] Figure 21 is a cross-sectional view along line A-A' in Figure 20. As shown in Figure 21, the display device also includes a drive circuit board 70 electrically connected to each display substrate 10. The drive circuit board 70 provides drive signals to the display substrate 10 to drive it to display. The drive circuit boards connected to different display substrates 10 can be electrically connected to each other to achieve mutual communication. The frame 60 includes a retaining wall portion 63 and a first edge portion 61 and a second edge portion 62 connected to the retaining wall portion 63. The retaining wall portion surrounds the side of the display module. The first edge portion 61 and the second edge portion 62 are distributed on opposite sides of the display module along its thickness direction, and the first edge portion 61 and the second edge portion 62 are located at the edge of the display module.

[0194] A receiving space Sp is defined between the display module and the bezel 60, and at least a portion of the drive circuit board 70 is located in the receiving space Sp to prevent the drive circuit board 70 from being exposed to the outside and affecting the overall appearance of the display device.

[0195] In one example, as shown in Figure 20, multiple display substrates 10 are arranged in two rows and multiple columns. The display substrates 10 in the first row include an upper edge away from the display substrates 10 in the second row. The display substrates 10 in the second row include a lower edge away from the display substrates 10 in the first row. The flexible circuit board 70 connected to the display substrates 10 in the first row is located at the upper edge of the corresponding display substrate 10. The driving circuit board 70 connected to the display substrates 10 in the second row is located at the lower edge of the display substrate 10, so that the driving circuit board can be placed in the receiving space Sp.

[0196] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A display module comprising a plurality of display substrates arranged in an array and independent of each other, each display substrate comprising a transparent substrate and a plurality of light-emitting devices disposed on the transparent substrate; a gap exists between two adjacent display substrates; The display module also includes a transparent support substrate, and the plurality of display substrates are all located on the same side of the transparent support substrate; The transparent support substrates are continuously distributed across the gap, and the orthographic projections of the plurality of light-emitting devices of each display substrate onto the extended surface of the transparent support substrate are all located within the support substrate. The display module further includes a first filling layer, which is located at least in the gap.

2. The display module according to claim 1, wherein, The width of the gap is in the range of 50 micrometers to 300 micrometers.

3. The display module according to claim 1, wherein, The refractive index n1 of the first filling layer and the refractive index n2 of the transparent substrate satisfy the following condition: 0.99≤n1 / n2≤1.

06.

4. The display module according to claim 1, wherein, The transparent substrate is made of glass; the display module further includes a first filling layer located in the gap, the refractive index n1 of the first filling layer being between 1.5 and 1.

6.

5. The display module according to claim 1, wherein, The transparent substrate includes a first surface that supports the light-emitting device, a second surface that faces away from the first surface, and a side surface located between the first surface and the second surface; Wherein, for two adjacent opposite sides of the display substrate, the first filling layer is continuously distributed along the side from the first side to the second side.

6. The display module according to claim 5, wherein, The transparent support substrate is located on the side of the second surface away from the first surface; In the thickness direction of the transparent substrate, the maximum distance from the first filling layer to the transparent support substrate is less than or equal to the distance from the surface of the light-emitting device away from the second surface to the transparent support substrate.

7. The display module according to claim 5, wherein, The surface of the first filler layer on the side closest to the first surface in the thickness direction of the transparent substrate is flush with the first surface.

8. The display module according to claim 5, wherein, The refractive index n1 of the first filling layer and the refractive index n2 of the transparent substrate satisfy the following condition: 0.73 ≤ n1 / n2 < 0.99; The surface of the first filling layer near the first surface in the thickness direction of the transparent substrate is convex.

9. The display module according to claim 8, wherein, The side surface is a hydrophobic surface, and / or the first surface includes a hydrophobic region near the gap.

10. The display module according to claim 8, wherein, The first filling layer includes a protrusion, which is the portion of the first filling layer that is higher than the first surface in the thickness direction of the transparent substrate relative to the second surface. The surface of the protrusion closer to the first surface in the thickness direction of the transparent substrate is the convex surface. The orthographic projection of the protrusion on the transparent support substrate overlaps with the orthographic projection of the first surfaces of the two adjacent display substrates corresponding to the first filling layer on the transparent support substrate.

11. The display module according to claim 5, wherein, The refractive index n1 of the first filling layer and the refractive index n2 of the transparent substrate satisfy the following condition: 0.73 ≤ n1 / n2 < 0.99; The first filling layer includes a transparent substrate, and the display module further includes diffused particles distributed in the transparent substrate. The transparent substrate and the diffused particles constitute the first filling layer.

12. The display module according to claim 5, wherein, The transparent support substrate is located on the side of the second surface away from the first surface; The plurality of display substrates include adjacent first display substrates and second display substrates, wherein near the edge of the gap, the distance from the first surface of the first display substrate to the transparent support substrate is greater than the distance from the first surface of the second display substrate to the transparent support substrate; The first filling layer between the first display substrate and the second display substrate has a first edge and a second edge opposite to the surface of the transparent support substrate. The first edge is connected to a first surface of the first display substrate, and the second edge is connected to a first surface of the second display substrate. Along the direction from the first edge to the second edge, the distance between the surface of the first filling layer away from the transparent support substrate and the transparent support substrate gradually decreases.

13. The display module according to claim 12, wherein, In the thickness direction of the transparent substrate, the distance from the first edge to the transparent support substrate is equal to the distance from the first surface of the first display substrate to the transparent support substrate, and the distance from the second edge to the transparent support substrate is equal to the distance from the first surface of the second display substrate to the transparent support substrate.

14. The display module according to claim 1, wherein, The transparent substrate includes a first surface that supports the light-emitting device, a second surface that faces away from the first surface, and a side surface located between the first surface and the second surface; In this embodiment, the opposite sides of two adjacent display substrates are inclined surfaces with the same tilt direction, and the inclined surfaces intersect the thickness direction of the transparent substrate.

15. The display module according to claim 14, wherein, The opposing inclined planes of two adjacent display substrates are parallel to each other, and the vertical distance between the two opposing inclined planes is in the range of 50 micrometers to 300 micrometers.

16. The display module according to claim 14, wherein, In the same display substrate, the orthographic projection of the light-emitting device on the transparent support substrate does not overlap with the orthographic projection of the inclined surface on the transparent support substrate.

17. The display module according to claim 14, wherein, The width W of the orthographic projection of the inclined plane onto the transparent support substrate satisfies: W≤P1-L; Wherein, P1 is the spacing between two adjacent light-emitting devices arranged along the first direction in the display substrate; the first direction is a direction extending along the direction of the display substrate and perpendicular to the direction of the gap extension; L is the width of the gap between two display substrates arranged along the first direction in the first direction.

18. The display module according to any one of claims 1 to 17, wherein, The two light-emitting devices located on opposite sides of the gap along its width direction and adjacent to the gap are respectively the first light-emitting device and the second light-emitting device; the distance P2 between the first light-emitting device and the second light-emitting device satisfies: 0.9*P3≤P2≤1.1*P3. Wherein, P3 is the spacing between two adjacent light-emitting devices in a single display substrate, whose light-emitting colors are the same as the first light-emitting device and the second light-emitting device, and which are arranged along the width direction of the gap.

19. The display module according to any one of claims 1 to 17, wherein, The orthographic projection of the first filling layer on the transparent support substrate does not overlap with the orthographic projection of any of the light-emitting devices on the transparent support substrate.

20. The display module according to any one of claims 1 to 17, wherein, The display module further includes a second filling layer, which is located on the side of the light-emitting device away from the transparent substrate and is continuously distributed thereon. The orthographic projections of multiple light-emitting devices in the display module onto the transparent substrate are all within the orthographic projection range of the second filling layer onto the transparent substrate. The second filling layer includes a first portion and a second portion, wherein the first portion is located on the side of the light-emitting device away from the transparent substrate, and the second portion is located between two adjacent light-emitting devices; The first filling layer and the second filling layer are in contact.

21. The display module according to claim 20, wherein, The refractive index n3 of the second filling layer and the refractive index n2 of the transparent substrate satisfy the following condition: 0.99≤n3 / n2≤1.

06.

22. The display module according to claim 20, wherein, The transparent support substrate is located on the side of the second filling layer away from the display substrate; Alternatively, the display module may further include a transparent cover plate located on the side of the second filling layer away from the display substrate, and the transparent support substrate located on the side of the display substrate away from the second filling layer.

23. A display module comprising a plurality of display substrates arranged in an array and independent of each other, each display substrate comprising a transparent substrate and a plurality of light-emitting devices disposed on the transparent substrate; a gap exists between two adjacent display substrates; The display module also includes a transparent support substrate, and the plurality of display substrates are all located on the same side of the transparent support substrate; The transparent support substrates are continuously distributed across the gap, and the orthographic projections of the plurality of light-emitting devices of each display substrate onto the extended surface of the transparent support substrate are all located within the transparent support substrate. The transparent substrate includes a first surface that supports the light-emitting device, a second surface that faces away from the first surface, and a side surface located between the first surface and the second surface; In this embodiment, the opposite sides of two adjacent display substrates are inclined surfaces with the same tilt direction, and the inclined surfaces intersect the thickness direction of the transparent substrate.

24. The display module according to claim 23, wherein, The opposing inclined planes of two adjacent display substrates are parallel to each other, and the vertical distance between the two opposing inclined planes is in the range of 50 micrometers to 300 micrometers.

25. The display module according to claim 23, wherein, In the same display substrate, the orthographic projection of the light-emitting device on the transparent support substrate does not overlap with the orthographic projection of the inclined surface on the transparent support substrate.

26. The display module according to claim 23, wherein, The display substrate contains multiple light-emitting devices that form multiple repeating units, and each repeating unit includes multiple light-emitting devices of different colors arranged along a first direction; The width W of the inclined plane satisfies: W≤P1-L; Wherein, P1 is the spacing between two adjacent light-emitting devices arranged along the first direction in the display substrate; the first direction is a direction extending along the direction of the display substrate and perpendicular to the direction of the gap extension; L is the width of the gap between two display substrates arranged along the first direction in the first direction.

27. The display module according to claim 23, wherein, The display module further includes a first filling layer, which is located at least in the gap; The refractive index n1 of the first filling layer and the refractive index n2 of the transparent substrate satisfy: 0.99 ≤n1 / n2≤1.

06.

28. A transparent display device, comprising a display module and a frame as described in any one of claims 1 to 27, wherein the frame is disposed around two opposing light-emitting surfaces of the display module; The plurality of display substrates are arranged in one of the following configurations: one row and N columns, N rows and one column, two rows and N columns, or N rows and two columns, where N is a positive integer greater than 1. Each of the display substrates includes driving leads for driving the plurality of light-emitting devices, the driving leads being led out from the side surface of the transparent substrate near the light-emitting device and through the edge of each display substrate near the frame.

29. The transparent display device according to claim 28, wherein, The display device further includes a drive circuit board electrically connected to the drive leads of each of the display substrates; The frame includes a retaining wall portion and a first edge portion and a second edge portion connected to the retaining wall portion. The retaining wall portion surrounds the side of the display module. The first edge portion and the second edge portion are distributed on opposite sides of the display module along its thickness direction, and the first edge portion and the second edge portion are located at the edge position of the display module. A receiving space is defined between the display module and the frame, and at least a portion of the driving circuit board is located within the receiving space.

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