Display module, method for manufacturing display module, and display device

Abstract

This application relates to a display module, a method for manufacturing the display module, and a display device. The display module includes a substrate and a light source disposed within the substrate. The substrate has a light-emitting surface through which light emitted from the light source can pass; the edge of the substrate has a light path adjustment surface where at least a portion of the light emitted from the light source undergoes total internal reflection. This display module can solve the problem of human eyes being able to observe bright lines in the splicing pattern within a certain viewing angle.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display module, a method for manufacturing the display module, and a display device. Background Technology

[0002] Transparent displays used in public spaces typically require large-screen displays. Currently, multiple small display modules are usually spliced ​​together to form a large transparent display. However, the seams created by this splicing cannot be eliminated, causing bright lines to be visible to the human eye within certain viewing angles. Summary of the Invention

[0003] Therefore, it is necessary to provide a display module, a method for manufacturing the display module, and a display device to address the issue that the human eye may observe the spliced ​​bright lines within a certain viewing angle.

[0004] According to one aspect of this application, a display module is provided, comprising: a substrate having a light-emitting surface; and a light-emitting source disposed within the substrate; wherein light emitted by the light-emitting source can pass through the light-emitting surface; and an optical path adjustment surface is provided at the edge of the substrate, wherein at least a portion of the light emitted by the light-emitting source undergoes total internal reflection at the optical path adjustment surface.

[0005] In some embodiments, the optical path adjustment surface surrounds the light-emitting surface.

[0006] In some embodiments, the optical path adjustment surface includes a transmission region and a reflection region, the transmission region being adjacent to the light-emitting surface, and the reflection region being located on the side of the transmission region away from the light-emitting surface; the light emitted by the light source can pass through the transmission region, and the light emitted by the light source undergoes total internal reflection in the reflection region.

[0007] In some embodiments, a plurality of light-emitting sources are arranged in the substrate, and the plurality of light-emitting sources are located on the same reference plane; the light-emitting surface is parallel to the reference plane; the light path adjustment surface extends outward from the edge of the light-emitting surface and is inclined toward the reference plane.

[0008] In some embodiments, the substrate has a peripheral surface surrounding and intersecting the optical path adjustment surface; the plurality of light sources include an outermost edge light source; the angle α between the tangent plane at any point on the optical path adjustment surface and the light-emitting surface satisfies the condition: 0 < α <tan -1 (D1 / D2)-sin -1 (n air / n); where D1 is the distance between the edge light source and the peripheral side surface, D2 is the distance between the edge light source and the light-emitting surface, and n airLet n be the refractive index of air and n be the refractive index of the substrate.

[0009] In some embodiments, the light emitted by the light source that propagates directly to the peripheral side surface without being reflected by the optical path adjustment surface has an incident angle β2 at the peripheral side surface that satisfies the condition: β2 < sin -1 (n air / n).

[0010] In some embodiments, the optical path adjustment surface is constructed as a plane; or the optical path adjustment surface is constructed as a non-plane, and the optical path adjustment surface includes a plurality of sub-adjustment surfaces connected sequentially along a direction away from the light-emitting surface; the light emitted by the light source undergoes at least partial total internal reflection in the sub-adjustment surfaces.

[0011] In some embodiments, the optical path adjustment surface is constructed as a non-planar surface, and the optical path adjustment surface includes a plurality of sub-adjustment surfaces connected sequentially along a direction away from the light-emitting surface; the light emitted by the light source undergoes total internal reflection at least partially in the sub-adjustment surfaces; wherein each of the sub-adjustment surfaces is constructed as a plane; or each of the sub-adjustment surfaces is constructed as a curved surface; or among the plurality of sub-adjustment surfaces, some of the sub-adjustment surfaces are constructed as planes, and another portion of the sub-adjustment surfaces are constructed as curved surfaces.

[0012] According to another aspect of this application, a method for manufacturing a display module is provided, the method comprising the following steps: providing a substrate having a light-emitting surface; disposing a light source within the substrate; cutting the substrate to form a light path adjustment surface at the edge of the substrate; wherein light emitted by the light source can pass through the light-emitting surface, and at least part of the light emitted by the light source undergoes total internal reflection at the light path adjustment surface.

[0013] According to another aspect of this application, a display device is provided, the display device comprising a plurality of display modules as described above, wherein the plurality of display modules are arranged at intervals along a row direction, and / or the plurality of display modules are arranged at intervals along a column direction.

[0014] The display module provided in this application, by setting an optical path adjustment surface at the edge of the substrate, ensures that when light emitted from the light source propagates to the edge of the substrate, at least a portion of the light undergoes total internal reflection under the action of the optical path adjustment surface. This prevents light from being refracted from the peripheral side of the substrate, thereby eliminating edge bright lines or reducing the amount of light refracted from the peripheral side of the substrate, thus weakening edge bright lines. Based on this, when multiple display modules are spliced ​​together, even if there is a splicing seam between two adjacent display modules, the splicing bright line that can be observed at the splicing seam will be very weak or even unobservable. Attached Figure Description

[0015] Figure 1This diagram illustrates the optical path principle for generating spliced ​​bright lines using a transparent display in related technologies.

[0016] Figure 2 This illustration shows a schematic diagram of the optical path of a display device formed by splicing two display modules in one embodiment of this application;

[0017] Figure 3 A schematic diagram of the optical path of a display module in one embodiment of this application is shown;

[0018] Figure 4 The optical path diagram is shown when the substrate does not have an optical path adjustment surface.

[0019] Figure 5 The optical path diagram is shown when the substrate has an optical path adjustment surface.

[0020] Figure 6 A detailed diagram showing the tilt angle of ray L4 and the tilt angle of the optical path adjustment surface is shown.

[0021] Figure 7 This invention illustrates the optical path diagram of light directly propagating to the peripheral side surface in one embodiment of the present application;

[0022] Figures 8 to 12 The following are schematic diagrams illustrating the structure of the display module in some embodiments of this application;

[0023] Figure 13 A schematic diagram of the structure of a display device according to an embodiment of this application is shown.

[0024] Explanation of icon numbers:

[0025] A: Transparent substrate 11b: Optical path adjustment surface

[0026] B: Transparent substrate 11b1: Transmittance area

[0027] S1: Light source; 11b2: Reflection area

[0028] S2: Light source 11c: Peripheral side

[0029] 1: Display device; 12: Light source

[0030] 10: Display module 12': Edge light source

[0031] 11: Substrate; 13: Reference plane

[0032] 11a: Light-emitting surface Detailed Implementation

[0033] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0034] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0039] Transparent displays are widely used in various indoor and outdoor public spaces. For example, they are used in shop windows and public information boards to display large images. However, due to limitations in the raw materials and manufacturing processes of transparent displays, it is usually difficult to directly manufacture large-sized transparent displays.

[0040] Taking a transparent LED display as an example, an LED transparent display includes a transparent substrate and an LED light source embedded in the transparent substrate. Due to factors such as the transparent substrate manufacturing process and driving mechanism, large-size LED transparent displays cannot be directly manufactured. Multiple small display modules need to be spliced ​​together to meet the demand for large-screen displays. However, current splicing processes cannot achieve seamless splicing, resulting in gaps between adjacent splicing blocks. In other words, in a large-size transparent display, there are seams between adjacent display modules.

[0041] The inventors of this application have discovered that when light emitted from a light source is refracted from a transparent substrate into the seam and eventually enters the human eye, it causes the human eye to perceive a bright line at the seam, that is, the human eye will observe light refracted from the peripheral cross-section of the transparent substrate.

[0042] For example, see Figure 1Light source S1 inside transparent substrate A emits light rays L1 and L2. Light ray L1 propagates to the boundary line between the upper and right sides of transparent substrate A, then exits directly outside the substrate and continues to propagate in the air. Light ray L2 propagates to the right side of transparent substrate A, where it is refracted, and then continues to propagate in the air. The path of light ray L2 after refraction from the right side intersects the boundary line between the left and upper surfaces of transparent substrate B. Based on this, the human eye will observe the light rays refracted from the right side of transparent substrate A within the range between light rays L1 and L2, visually perceiving a bright line.

[0043] The inventors of this application further investigated the range of the spliced ​​bright lines. (See reference...) Figure 1 The refractive index of transparent substrate A is n1, and the refractive index of air is 1. The distance between light source S1 and the upper surface of transparent substrate A is H, and the distance between light source S1 and the right side of transparent substrate A is W. The vertical distance between the intersection point of ray L2 and the right side of transparent substrate A and light source S1 is H1, and the distance between the intersection point of ray L2 and the right side of transparent substrate A and the upper surface of transparent substrate A is P1. The width of the seam between transparent substrate A and transparent substrate B is P. The angle between ray L1 and the vertical direction is θ1, and the angle between ray L2 and the vertical direction is θ2. The vertical direction is the direction perpendicular to the upper surface of transparent substrate A.

[0044] Based on this, θ1 = tan -1 (W / H), that is, θ1=arctan(W / H), θ2=tan -1 (W / H1), that is, θ2=arctan(W / H1). During the refraction of light ray L2 from the transparent substrate A into the air, the angle of incidence is 90°-θ2, and the angle of refraction is θ. A According to Snell's Law (also known as the law of refraction), n1*sin(90°-θ2)=1*sinθ A Therefore, θ A =sin -1 [n1*sin(90°-θ2)]. Also, because H1=H-P1, P1=P*tanθ A Therefore, H1 = HP * tan{sin -1 [n1*sin(90°-θ2)]}, that is, H1=HP*tan{arcsin[n1*sin(90°-θ2)]}, thus obtaining

[0045] In summary, the angle θ between the ray located between ray L1 and ray L2 and the perpendicular direction satisfies the following condition: Where W, H, P, and n1 are known values. It is evident that to reduce the number of rays located between light rays L1 and L2, i.e., to narrow the range of the included angle θ, the width P of the seam between transparent substrate A and transparent substrate B needs to be adjusted. However, due to current manufacturing processes, adjusting the seam width is difficult. Therefore, eliminating or reducing the bright lines at the seam becomes a challenge.

[0046] To address the aforementioned issues, this application provides a display module comprising a substrate and a light source disposed within the substrate. The substrate is provided with a light path adjustment surface, which adjusts the propagation path of light that may be refracted to the splicing seam to generate splicing bright lines, causing it to be partially or completely reflected back into the substrate, thereby reducing the intensity of the splicing bright lines or eliminating the splicing bright lines.

[0047] Figure 2 This illustration shows a schematic diagram of the optical path of a display device formed by splicing two display modules in one embodiment of this application. Figure 3 A schematic diagram of the optical path of a display module in one embodiment of this application is shown.

[0048] See Figure 2 and Figure 3 An embodiment of this application provides a display module 10, including a substrate 11 and light sources 12 disposed within the substrate 11. Exemplarily, the substrate 11 contains a plurality of light sources 12, arranged in an array, or arranged in other ways. The substrate 11 has a light-emitting surface 11a, and an optical path adjustment surface 11b is provided at the edge of the substrate 11. Light emitted from the light sources 12 can pass through the light-emitting surface 11a, and at least a portion of the light emitted from the light sources 12 undergoes total internal reflection at the optical path adjustment surface 11b. Based on this, when the light emitted from the light sources 12 propagates to the edge of the substrate 11, at least a portion of the light undergoes total internal reflection under the action of the optical path adjustment surface 11b, thereby preventing light from being refracted from the peripheral surface 11c of the substrate 11, thus eliminating edge bright lines, or reducing the light refracted from the peripheral surface 11c of the substrate 11, thereby weakening edge bright lines. Furthermore, when multiple display modules 10 are spliced ​​together, even if there is a splicing seam between two adjacent display modules 10, the splicing bright line that can be observed at the splicing seam will be very weak or even unobservable.

[0049] Optionally, the substrate 11 is a transparent substrate. Based on this, the display module 10 can achieve a transparent display effect. Furthermore, the substrate 11 can also be a flexible transparent substrate, which facilitates embedding the light source 12 inside the substrate.

[0050] Optionally, the light source 12 is an LED light source, a mini LED light source, or a micro LED light source.

[0051] In some embodiments, the optical path adjustment surface 11b surrounds the light-emitting surface 11a. In this way, the optical path adjustment surface 11b can play a role in optical path adjustment in various regions around the light-emitting surface 11a, making the optical path adjustment effect more comprehensive.

[0052] Optionally, see Figure 2 and Figure 3 The optical path adjustment surface 11b includes a transmission region 11b1 and a reflection region 11b2. The transmission region 11b1 is adjacent to the light-emitting surface 11a, and the reflection region 11b2 is located on the side of the transmission region 11b1 away from the light-emitting surface 11a. Light emitted from the light source 12 can pass through the transmission region 11b1, and the light emitted from the light source 12 undergoes total internal reflection in the reflection region 11b2. Based on this, both the transmission region 11b1 and the light-emitting surface 11a of the optical path adjustment surface 11b can allow light emitted from the light source 12 to pass through, thereby increasing the effective display area. At the same time, the reflection region 11b2, located on the side of the transmission region 11b1 away from the light-emitting surface 11a, can cause the light emitted from the light source 12 to undergo total internal reflection, thereby reducing or eliminating edge bright lines.

[0053] Optionally, a plurality of light-emitting sources 12 are arranged within the substrate 11, and the plurality of light-emitting sources 12 are located on the same reference plane 13. The light-emitting surface 11a is parallel to the reference plane 13, and the light path adjustment surface 11b extends outward from the edge of the light-emitting surface 11a and is inclined toward the reference plane 13. Exemplarily, the substrate 11 is a flat plate structure. In the region where the light-emitting surface 11a is located, the thickness of the substrate 11 is uniform; in the region where the light path adjustment surface 11b is located, the thickness of the substrate 11 decreases sequentially in the direction away from the light-emitting surface 11a. The thickness of the substrate 11 can decrease uniformly or non-uniformly. This application changes the propagation path of light at the edge of the substrate 11 by setting the light path adjustment surface 11b to extend outward from the edge of the light-emitting surface 11a and be inclined toward the reference plane 13, so that the light that would originally be refracted from the cross-section of the periphery of the substrate 11 undergoes total internal reflection under the action of the light path adjustment surface 11b, thereby eliminating or weakening the bright lines at the edge.

[0054] Furthermore, the optical path adjustment surface 11b extends outward from the edge of the light-emitting surface 11a and is inclined toward the reference surface 13 where the plurality of light-emitting sources 12 are located within the substrate 11. The substrate 11 also has a peripheral surface 11c surrounding the optical path adjustment surface 11b and intersecting with it. Specifically, the shape of the peripheral surface 11c can be adjusted according to the shapes of the light-emitting surface 11a and the optical path adjustment surface 11b. For example, the shape of the peripheral surface 11c can be a square ring, a circular ring, a rectangular ring, a rhombus ring, or a triangular ring. The plurality of light-emitting sources 12 includes the outermost edge light-emitting source 12'. Based on this, in order to more accurately form the optical path adjustment surface 11b on the substrate 11 to obtain a good effect of eliminating or reducing edge bright lines, the inventors of this application have studied the tilt angle of the optical path adjustment surface 11b.

[0055] Figure 4 The optical path diagram is shown when the substrate does not have an optical path adjustment surface. Figure 5 The optical path diagram is shown when the substrate has an optical path adjustment surface.

[0056] Specifically, see Figure 4 When the substrate does not have a light path adjustment surface, light ray L3 will pass through the boundary line between the upper surface and the right side surface of the substrate and exit directly from the boundary line. The incident angle of light ray L3 is less than the critical angle of total internal reflection. The incident angle of light ray to the right of light ray L3 is also less than the incident angle of light ray L3. Therefore, the incident angle of light ray to the right of light ray L3 is also less than the critical angle of total internal reflection. That is, the light ray to the right of light ray L3 will be refracted from the right side of the substrate, causing bright lines to appear at the edge of the display module, resulting in bright lines when multiple display modules are spliced ​​together.

[0057] See Figure 5 When the substrate 11 is provided with an optical path adjustment surface 11b, assuming that the incident angle β of light ray L4 is exactly equal to the critical angle of total internal reflection, light ray L4 undergoes total internal reflection at the optical path adjustment surface 11b. Thus, light rays to the left of light ray L4 are refracted from the optical path adjustment surface 11b or the light-emitting surface 11a and displayed normally, while light rays to the right of light ray L4 undergo total internal reflection at the optical path adjustment surface 11b, thereby preventing light rays from being refracted from the peripheral side surface 11c and producing bright edge lines. Specifically, when two patterns with and without an optical path adjustment surface 11b overlap, light rays L3 and L4 are located at the same position.

[0058] Optionally, after total internal reflection occurs on the optical path adjustment surface 11b, the light ray L4 is transmitted out of the substrate 11 through the surface of the substrate 11 opposite to the light-emitting surface 11a. Alternatively, after total internal reflection occurs on the optical path adjustment surface 11b, total internal reflection further occurs on the circumferential side surface 11c, and the light ray propagates in a direction away from the light-emitting surface. Alternatively, after total internal reflection occurs on the optical path adjustment surface 11b, refraction occurs on the circumferential side surface 11c. When total internal reflection occurs on the optical path adjustment surface 11b and refraction occurs on the circumferential side surface 11c, the light ray refracted out of the circumferential side surface 11c can further enter the adjacent another substrate through refraction by the air in the splicing seam. Since the amount of this part of the light ray is small, the influence on the substrate when refracting into the another substrate is small.

[0059] Figure 6 A detailed view showing the inclination angle of the light ray L4 and the inclination angle of the optical path adjustment surface is shown.

[0060] Since the incident angle β of the light ray L4 is equal to the total reflection critical angle, according to the relative refractive index formula, n*sinβ = 1*sin90°, where n is the refractive index of the substrate 11 and the refractive index of air is 1, it is obtained that β = sin -1 (1 / n), that is, β = arcsin(1 / n). At the same time, referring to Figure 5 and Figure 6 , β = 90° - α2 = α1 + α3 - α2 = α1 + (-α) = α1 - α, it is obtained that the included angle α between the tangent plane at any point on the optical path adjustment surface 11b and the light-emitting surface 11a satisfies the condition: α = α1 - β. Combining α1 = tan -1 (D1 / D2), that is, α1 = arctan(D1 / D2), where D1 is the distance between the edge light source 12' and the circumferential side surface 11c, and D2 is the distance between the edge light source 12' and the light-emitting surface 11a, it is obtained that the included angle α between the tangent plane at any point on the optical path adjustment surface 11b and the light-emitting surface 11a satisfies the condition: 0 < α < tan -1 (D1 / D2) - sin -1 (1 / n), that is, 0 < α < arctan(D1 / D2) - arcsin(1 / n). It can be understood that when the refractive index of air is not taken as 1, the included angle α between the tangent plane at any point on the optical path adjustment surface 11b and the light-emitting surface 11a satisfies the condition: 0 < α < tan -1 (D1 / D2) - sin -1 (n air / n), that is, 0 < α < arctan(D1 / D2) - arcsin(n air / n), where n airThe refractive index of air is used to define the tilt angle of the optical path adjustment surface 11b. Based on this tilt angle, the optical path adjustment surface 11b can effectively eliminate or reduce edge bright lines.

[0061] Figure 7 This paper shows an optical path diagram of light propagating directly to the peripheral side surface in one embodiment of this application.

[0062] See Figure 7 Optionally, for the light emitted by the light source 12, the light rays that propagate directly to the peripheral surface 11c without being reflected by the light path adjustment surface 11b, the incident angle β2 at the peripheral surface 11c satisfies the condition: β2 < sin -1 (n air / n), that is, β2<arcsin(n) air / n). When the refractive index of air is 1, β2 < arcsin(1 / n). It is understandable that if light directly propagating to the peripheral surface 11c undergoes total internal reflection at the peripheral surface 11c, the reflected light may propagate towards the light-emitting surface 11a or the light path adjustment surface 11b, thereby interfering with the light transmitted through the light-emitting surface 11a, or refracting through the light path adjustment surface 11b into the splicing seam, resulting in a bright line in the product splicing. This embodiment limits the incident angle of light directly propagating to the peripheral surface 11c at the peripheral surface 11c to avoid total internal reflection of light directly propagating to the peripheral surface 11c, thereby further improving the display effect.

[0063] Figures 8 to 12 A schematic diagram of the display module structure is shown in some embodiments of this application.

[0064] See Figure 8 In some embodiments, the optical path adjustment surface 11b is constructed as a plane. In this way, while meeting the requirements for optical path adjustment, the manufacturing process of the display module 10 can be simplified, production costs can be reduced, and production efficiency can be improved.

[0065] In other embodiments, the optical path adjustment surface 11b is non-planar and includes multiple sub-adjustment surfaces connected sequentially along a direction away from the light-emitting surface 11a. Light emitted from the light source 12 undergoes at least partial total internal reflection at the sub-adjustment surfaces. Thus, the structure of the substrate 11 can be adjusted according to process conditions and product requirements, satisfying both optical path adjustment needs and expanding its applicability.

[0066] See Figure 9 and Figure 10, optionally, the optical path adjustment surface 11b is configured as a non-planar surface. The optical path adjustment surface 11b includes a plurality of sub-adjustment surfaces sequentially connected in a direction away from the light-emitting surface 11a. At least part of the light rays emitted by the light source 12 are totally reflected on the sub-adjustment surfaces, and the shapes of the plurality of sub-adjustment surfaces can be the same or different. Exemplarily, the shape of the sub-adjustment surface is a planar surface or a curved surface. When the shapes of the plurality of sub-adjustment surfaces are the same, the optical path adjustment surface 11b can be a multi-segment planar structure formed by combining a plurality of planar surfaces. In other words, each sub-adjustment surface is configured as a planar surface; or, the optical path adjustment surface 11b can be a multi-segment curved surface structure formed by combining a plurality of curved surfaces. In other words, each sub-adjustment surface is configured as a curved surface. When the shapes of the plurality of sub-adjustment surfaces are different, the optical path adjustment surface 11b can be a special-shaped structure formed by combining a planar surface and a curved surface. In other words, among the plurality of sub-adjustment surfaces, some sub-adjustment surfaces are configured as planar surfaces, and some other sub-adjustment surfaces are configured as curved surfaces. The substrate 11 formed thereby expands the applicable range of the display module 10 while meeting the optical path adjustment requirements.

[0067] It can be understood that when the optical path adjustment surface 11b is a non-planar surface, for example, when the optical path adjustment surface 11b is formed by combining a plurality of sub-adjustment surfaces, by controlling the angle α between the tangent plane at any point on each sub-adjustment surface and the light-emitting surface 11a to satisfy the condition: 0 < α < tan-1(D1 / D2) - sin-1(1 / n), a better optical path adjustment effect can be obtained for the entire optical path adjustment surface 11b.

[0068] Further, when the optical path adjustment surface 11b is configured as a non-planar surface, the optical path adjustment surface 11b can be a non-planar surface that is recessed toward the lower surface of the substrate 11, or a non-planar surface that protrudes in a direction away from the lower surface of the substrate 11. Exemplarily, the optical path adjustment surface 11b can be a curved surface that is recessed toward the lower surface of the substrate 11 as shown in Figure 9 , or a curved surface that protrudes in a direction away from the lower surface of the substrate 11 as shown in Figure 11 , or a combined surface that is recessed toward the lower surface of the substrate 11 formed by combining a plurality of planar surfaces as shown in Figure 10 , or a combined surface that protrudes in a direction away from the lower surface of the substrate 11 formed by combining a plurality of planar surfaces as shown in Figure 12 .

[0069] It should be noted that the above upper surface, lower surface, and right side surface refer to the surfaces corresponding to each direction on the substrate 11 in the illustrated state. During the application process of the display module, when the placement direction of the substrate 11 changes relative to the illustrated direction, the position orientations of the upper surface, lower surface, and right side surface will change accordingly, but the relative position relationship between the upper surface, lower surface, and right side surface remains unchanged.

[0070] Based on the same inventive purpose, the present application also provides a method for manufacturing a display module.

[0071] In one embodiment of this application, the method for manufacturing the display module includes the following steps:

[0072] A substrate is provided, the substrate having a light-emitting surface;

[0073] A light source is placed inside the substrate;

[0074] The substrate is cut to form an optical path adjustment surface at the edge of the substrate;

[0075] Among them, the light emitted by the light source can pass through the light-emitting surface, and at least part of the light emitted by the light source undergoes total internal reflection at the light path adjustment surface.

[0076] The method for manufacturing a display module provided in this embodiment involves setting an optical path adjustment surface at the edge of the substrate. When light emitted from the light source reaches the edge of the substrate, at least a portion of the light undergoes total internal reflection under the action of the optical path adjustment surface. This prevents light from being refracted from the peripheral surface of the substrate, thereby eliminating edge bright lines or reducing the amount of light refracted from the peripheral surface of the substrate, thus weakening the edge bright lines. Based on this, when multiple display modules are spliced ​​together, even if there is a splicing seam between two adjacent display modules, the splicing bright lines that can be observed at the splicing seam will be very weak or even unobservable.

[0077] Specifically, laser cutting can be used to cut the substrate. During the cutting process, a fixture can be used to fix the substrate. Optionally, the fixture is set on a rotating platform, and the substrate is rotated by the rotating platform. In this way, the angle between the substrate and the laser beam is α, and then the laser beam is used to cut, thus obtaining the optical path adjustment surface.

[0078] Furthermore, the number of light sources in the substrate, the arrangement of the light sources, the shape of the light path adjustment surface, the tilt angle of the light path adjustment surface, and the beneficial effects thereof can be referred to the description of the display module in the above embodiments, and will not be repeated here.

[0079] For the same inventive purpose, this application also provides a display device. See also... Figure 2 The display device 1 includes a plurality of display modules 10 as described in the above embodiments. Optionally, the plurality of display modules 10 may be arranged at intervals along the row direction and column direction.

[0080] Figure 13 A schematic diagram of the structure of a display device according to an embodiment of this application is shown.

[0081] See Figure 13For example, multiple display modules 10 are arranged at intervals along the row direction or at intervals along the column direction. This allows for the assembly of an elongated display device 1. In other embodiments, the multiple display modules 10 can also be arranged at intervals in both the row and column directions simultaneously, for example, in an array. This allows for the assembly of a square or near-square display device 1.

[0082] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A display module, characterized in that, include: A substrate having a light-emitting surface, an edge of the substrate having a light path adjustment surface surrounding the light-emitting surface, and a peripheral surface surrounding the light path adjustment surface and intersecting the light path adjustment surface; the light path adjustment surface includes a transmission region and a reflection region, the transmission region being adjacent to the light-emitting surface, and the reflection region being located on the side of the transmission region away from the light-emitting surface. as well as Multiple light sources are disposed within the substrate; light emitted by the light sources can pass through the light-emitting surface; light emitted by the light sources can pass through the transmission area; and light emitted by the light sources undergoes total internal reflection in the reflection area. In this configuration, multiple light sources are located on the same reference plane, and the peripheral side surface includes at least one side of the reference plane facing the light-emitting surface. The peripheral side surface is perpendicular to the light-emitting surface and is arranged in a straight line. The optical path adjustment surface extends outward from the edge of the light-emitting surface and is inclined toward the reference plane. The plurality of light sources include the outermost edge light source; the angle α between the tangent plane at any point on the optical path adjustment surface and the light-emitting surface satisfies the condition: 0 < α <tan -1 (D1 / D2)-sin -1 (n air / n); Among the light emitted by the light source, the light rays that propagate directly to the peripheral side surface without being reflected by the light path adjustment surface, have an incident angle β2 on the peripheral side surface that satisfies the condition: β2<sin -1 (n) air / n); D1 is the distance between the edge light source and the peripheral surface, D2 is the distance between the edge light source and the light-emitting surface, n air Let n be the refractive index of air and n be the refractive index of the substrate.

2. The display module according to claim 1, characterized in that, The light-emitting surface is parallel to the reference surface.

3. The display module according to claim 2, characterized in that, The optical path adjustment surface is constructed as a plane.

4. The display module according to claim 2, characterized in that, The optical path adjustment surface is non-planar, and the optical path adjustment surface includes multiple sub-adjustment surfaces connected sequentially along a direction away from the light-emitting surface; The light emitted by the light source undergoes at least partial total internal reflection at the sub-adjustment surface.

5. The display module according to claim 4, characterized in that, Each of the sub-adjustment surfaces is constructed as a plane.

6. The display module according to claim 4, characterized in that, Each of the sub-adjustment surfaces is constructed as a curved surface.

7. The display module according to claim 4, characterized in that, Of the multiple sub-adjustment surfaces, some are constructed as planes, while others are constructed as curved surfaces.

8. A method for manufacturing a display module, characterized in that, The method includes the following steps: A substrate is provided, the substrate having a light-emitting surface; Multiple light sources are disposed within the substrate; the light emitted by the light sources can pass through the light-emitting surface, and the multiple light sources are located on the same reference surface; The substrate is cut to form an optical path adjustment surface at its edge. The optical path adjustment surface is disposed around the light-emitting surface. The edge of the substrate is also provided with a peripheral side surface that surrounds the optical path adjustment surface and intersects with it. The optical path adjustment surface includes a transmission region and a reflection region. The transmission region is adjacent to the light-emitting surface, and the reflection region is located on the side of the transmission region away from the light-emitting surface. The peripheral side surface includes at least one surface located on the side of the reference surface facing the light-emitting surface. The peripheral side surface is perpendicular to the light-emitting surface and is arranged in a straight line. The optical path adjustment surface extends outward from the edge of the light-emitting surface and is inclined toward the reference surface. The light emitted by the light source can pass through the transmission area, and the light emitted by the light source undergoes total internal reflection in the reflection area. The plurality of light sources include the outermost edge light source; the angle α between the tangent plane at any point on the optical path adjustment surface and the light-emitting surface satisfies the condition: 0 < α <tan -1 (D1 / D2)-sin -1 (n air / n); Among the light emitted by the light source, the light rays that propagate directly to the peripheral side surface without being reflected by the light path adjustment surface, have an incident angle β2 on the peripheral side surface that satisfies the condition: β2<sin -1 (n) air / n); D1 is the distance between the edge light source and the peripheral surface, D2 is the distance between the edge light source and the light-emitting surface, n air Let n be the refractive index of air and n be the refractive index of the substrate.

9. A display device, characterized in that, Includes multiple display modules as described in any one of claims 1-7; Wherein, multiple display modules are arranged at intervals along the row direction; and / or The multiple display modules are arranged at intervals along the column direction.

10. A display device, characterized in that, This includes display modules manufactured using the method described in claim 8; Wherein, multiple display modules are arranged at intervals along the row direction; and / or The multiple display modules are arranged at intervals along the column direction.

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