Side-incoming backlight module and display device
By employing a combination design of light source components, light guide film, and reflector sheet in the side-lit backlight module, and utilizing the protrusions and prism groove structure on the light guide film, combined with microprisms, the problems of uneven light and insufficient brightness are solved, achieving high brightness and uniform light effects, while reducing production costs and thickness.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HUIZHOU VISION NEW TECH CO LTD
- Filing Date
- 2022-05-30
- Publication Date
- 2026-05-12
AI Technical Summary
In existing side-lit backlight modules, the light guide plate suffers from uneven light distribution and insufficient brightness due to its design, resulting in high cost and complex manufacturing process.
The design employs a combination of light source components, light guide film, and reflector sheet. The light guide film features protrusions and prism grooves, allowing light to be reflected and converged within it. Combined with a microprism structure, this enhances light uniformity and brightness.
It achieves improved light uniformity and brightness, reduces the thickness and production cost of the light guide film, simplifies the process, and is suitable for automated assembly.
Smart Images
Figure CN114895495B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of display technology, and more particularly to a side-lit backlight module and a display device. Background Technology
[0002] Liquid crystal display (LCD) devices have advantages such as small size, light weight, low power consumption and low radiation, and are therefore widely used in various electronic products such as laptops, digital camcorders, mobile phones, computer screens and LCD TVs.
[0003] Since liquid crystal displays (LCDs) are not self-emissive, they require a backlight module to provide a uniform and high-brightness light source. In related technologies, the backlight module primarily consists of light-emitting components paired with a light guide plate. The light guide plate is created by laser engraving, V-shaped cross-grid engraving, and UV screen printing techniques to print light guide points onto a substrate. When light emitted from the light-emitting components reaches these light guide points, it is reflected, generating emitted light. This reflected light then diffuses at various angles, thus illuminating the liquid crystal module.
[0004] Therefore, it is evident that light guide plates are costly and complex to manufacture due to the need for a combination of spectral analysis principles and printing technology. When this light guide plate is used in a side-lit backlight module, because the light-emitting component is located on one side of the light guide plate and the liquid crystal module is located on the adjacent side, the light intensity on the side of the light guide plate farther from the light-emitting component is lower, resulting in uneven light distribution and low brightness to the liquid crystal module. Summary of the Invention
[0005] This application provides an edge-lit backlight module and a display device, which can generate uniform and high-brightness light.
[0006] This application provides a side-lit backlight module, including:
[0007] A light source assembly includes a substrate, a light-emitting unit, and a photomask. The light-emitting unit is disposed on the substrate, and the light-emitting surface of the light-emitting unit is concave. The photomask is connected to the substrate and has a receiving cavity, a first opening communicating with the receiving cavity, and a second opening. The photomask is disposed on the light-emitting unit through the first opening.
[0008] A light guide film is snapped into the second opening. The light guide film has a first side, a second side opposite to the first side, and a third side connected to the first side and the second side. The first side is provided with a plurality of protrusions, and the second side is provided with a plurality of prism grooves. The size or distribution density of the prism grooves gradually increases from the direction close to the light source component to the direction away from the light source component.
[0009] A reflective sheet, wherein the reflective sheet is disposed below the second side surface;
[0010] The light emitted by the light-emitting unit is reflected on the inner wall of the light cover, enters the light guide film through the third side, and is then reflected by the groove wall of the prism groove and the reflective sheet to the first side, and finally converges by the multiple protrusions.
[0011] In some embodiments, the plurality of protrusions are arranged in an array.
[0012] In some embodiments, the size or distribution density of the plurality of protrusions gradually increases along the direction from the light source component to the direction away from the light source component.
[0013] In some embodiments, the protrusion is hemispherical or pyramidal in shape.
[0014] In some embodiments, the thickness of the light guide film is 0.3 mm to 1 mm.
[0015] In some embodiments, the photomask is spherical.
[0016] In some embodiments, the side-lit backlight module further includes a first substrate disposed on the first side surface, and a plurality of first microprisms are disposed on the side of the first substrate away from the light guide film, wherein the extension directions of the plurality of first microprisms are all parallel to the first direction.
[0017] In some embodiments, the side-lit backlight module further includes a second substrate, which is disposed on the side of the first substrate away from the light guide film. A plurality of second microprisms are disposed on the side of the second substrate away from the light guide film, and the extension directions of the plurality of second microprisms are all parallel to a second direction, wherein the first direction intersects the second direction.
[0018] In some embodiments, the number of light-emitting units is n, and m light-emitting units form a light-emitting set. The plurality of light-emitting sets are arranged sequentially along the length direction of the substrate. In each light-emitting set, m light-emitting units are arranged sequentially along the length direction perpendicular to the substrate, where n≥m. The number of photomasks is plurality, and the plurality of photomasks correspond one-to-one with the plurality of light-emitting sets. Each photomask covers one of the light-emitting sets.
[0019] This application also provides a display device including the above-described side-lit backlight module.
[0020] The side-lit backlight module provided in this application includes a light source assembly, a light guide film, and a reflective sheet. Light emitted from the light-emitting unit of the light source assembly is reflected on the inner wall of the photomask and then enters the light guide film from the third side. It is then reflected on the groove wall of the prism groove. The farther away from the light source assembly, the larger or more numerous the groove walls become, ensuring that the amount of reflection remains approximately consistent and the light is uniform in the direction away from the light source assembly. The reflected light is reflected again by the reflective sheet located on the second side and then converged by multiple protrusions on the first side, increasing the brightness of the light and resulting in uniform and bright light. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the first structure of the side-lit backlight module provided in the embodiments of this application.
[0023] Figure 2 This is a schematic diagram of a second structure of a side-lit backlight module provided in an embodiment of this application.
[0024] Figure 3 This is a schematic diagram of the first structure of the light guide film provided in the embodiments of this application.
[0025] Figure 4 This is a rendering of the side-lit backlight module provided in an embodiment of this application.
[0026] Figure 5 This is a schematic diagram of a second structure of the light guide film provided in an embodiment of this application.
[0027] Figure 6 for Figure 5 A magnified view of part A.
[0028] Figure 7 This is a schematic diagram of a third structure of the light guide film provided in an embodiment of this application.
[0029] Figure 8 for Figure 7 A magnified view of part B.
[0030] Figure 9This is a schematic diagram of a third structure of a side-lit backlight module provided in an embodiment of this application.
[0031] Figure 10 This is a schematic diagram of the structure of the display device provided in the embodiments of this application. Detailed Implementation
[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0033] This application provides a side-lit backlight module and a display device capable of generating uniform and high-brightness light. The following detailed description is provided in conjunction with the accompanying drawings.
[0034] Please see Figure 1 as well as Figure 2 , Figure 1 This is a schematic diagram of the first structure of the side-lit backlight module provided in the embodiments of this application. Figure 2 This is a schematic diagram of a second structure of a side-lit backlight module provided in an embodiment of this application.
[0035] This application provides a side-lit backlight module 10. The side-lit backlight module 10 includes a light source assembly 11, a light guide film 12, and a reflective sheet 13.
[0036] The light source assembly 11 includes a substrate 111, a light-emitting unit 112, and a photomask 113. The light-emitting unit 112 is disposed on the substrate 111, and the photomask 113 is connected to the substrate 111. The photomask 113 has a receiving cavity 114, a first opening 115 communicating with the receiving cavity 114, and a second opening 116. The photomask 113 covers the light-emitting unit 112 through the first opening 115. The light-emitting surface 1121 of the light-emitting unit 112 is concave. It is understood that when the light-emitting surface 1121 of the light-emitting unit 112 is concave, it can converge the light, thereby narrowing the emission angle of the light-emitting unit 112. The inner wall of the photomask 113 has a high reflectivity, and the light emitted by the light-emitting unit 112 can be reflected by the inner wall of the photomask 113, thereby narrowing the light beam before it finally exits through the second opening 116.
[0037] The light guide film 12 is snapped into the second opening 116. The inner wall of the photomask 113 can diffusely reflect the light generated by the light-emitting unit 112, allowing light to enter the light guide film 12 from the third side 123. The light guide film 12 has a first side 121, a second side 122, a third side 123, and a fourth side connected in sequence. The first side 121 and the second side 122 are opposite to each other, and the third side 123 and the fourth side are opposite to each other. The first side 121 has multiple protrusions 124, and the second side 122 has multiple prismatic grooves 125. (See also...) Figure 3 , Figure 3 This is a schematic diagram of a first structure of the light guide film provided in an embodiment of this application. The size or distribution density of the prism groove 125 gradually increases along the direction H from the light source assembly 11 toward the distance from the light source assembly 11. For example, each prism groove 125 has a geometric center point. In one case, the distance between adjacent geometric center points gradually increases in the direction from the light source assembly 11 toward the distance from the light source assembly 11, for example, increasing in an increasing sequence. In another case, the distance between adjacent geometric centers remains unchanged in the direction from the light source assembly 11 toward the distance from the light source assembly 11, and the size of the prism groove 125 gradually increases, for example, the surface area of the bottom surface of the prism groove 125 increases in an increasing sequence.
[0038] The reflector 13 is disposed below the second side surface 122. It is understood that the light emitted by the light source assembly 11 enters the light guide film 12 through the third side surface 123 and is reflected on the groove wall of the prism groove 125. The farther away from the light source assembly 11, the larger or more numerous the groove walls become, ensuring that the amount of reflection remains approximately consistent in the direction away from the light source assembly 11. Thus, the reflected light is reflected again by the reflector 13 located on the second side surface 122 and then converged by the multiple protrusions 124 on the first side surface 121, thereby increasing the brightness of the light. It is understood that the light emitted by the light-emitting unit 112 is reflected on the inner wall of the light cover 113, enters the light guide film 12 through the third side surface 123, and is then reflected by the groove wall of the prism groove 125 and the reflector 13 to the first side surface 121, finally converging by the multiple protrusions 124.
[0039] The side-lit backlight module 10 provided in this embodiment includes a light source assembly 11, a light guide film 12, and a reflective sheet 13. Light emitted from the light-emitting unit 112 of the light source assembly 11 is reflected on the inner wall of the photomask 113, then enters the light guide film 12 through the third side 123. It is then reflected on the groove wall of the prism groove 125. The farther away from the light source assembly 11, the larger or more numerous the groove walls become, ensuring that the amount of reflection remains approximately consistent and the light is uniform in the direction away from the light source assembly 11. The reflected light is then reflected again by the reflective sheet 13 located on the second side 122, and then converged by multiple protrusions 124 on the first side 121, thereby increasing the brightness of the light and resulting in uniform and high-brightness light. Please refer to [link to relevant documentation]. Figure 4 , Figure 4 This is an illustration of the side-lit backlight module provided in an embodiment of this application. The side-lit backlight module 10 can obtain uniform and high-brightness light.
[0040] It is worth noting that with the development of LED technology, there are more and more backlight module display technology solutions, and the development of more competitive backlight module products has always been a constant topic. Even now, the cost of edge-lit backlight modules remains relatively high compared to direct-lit backlight modules. The main difference lies in the higher cost of the light guide plate, the optical component of the edge-lit backlight module. However, the light guide plate is the most critical component of the edge-lit backlight module; without it, the point and line light sources of the edge-lit backlight module cannot be uniformly transmitted, thus failing to achieve a uniform and consistent visual effect. However, in this embodiment, a thin light guide film 12 with light guiding function is designed. The second side 122 of the light guide film 12 is provided with a prism groove 125, and the first side 121 is provided with a protrusion 124. This allows the side-lit backlight module 10 to integrate its traditional light guide plate, optical film and other optical components into a single functional optical film. From a structural design perspective, this achieves component integration design, simplifies the overall structure, and makes it easier to achieve future automated assembly processes.
[0041] The process of setting multiple protrusions 124 on the first side 121 of the light guide film 12 can be as follows: a layer of first soft resin is set on the light guide film 12, multiple protrusions 124 are formed on the first soft resin using a roller or mold with an uneven surface, and finally the first soft resin is irradiated with ultraviolet light to cause the first soft resin to undergo a cross-linking reaction and thus solidify to form multiple protrusions 124.
[0042] The process of setting multiple prismatic grooves 125 on the second side 122 of the light guide film 12 can be as follows: a layer of second soft resin is set on the light guide film 12, multiple prismatic grooves 125 are formed on the second soft resin using a roller or mold with an uneven surface, and finally the second soft resin is irradiated with ultraviolet light to cause the second soft resin to undergo a cross-linking reaction and thus solidify to form multiple grooves 125.
[0043] The first and second soft resins can be made of either free-radical or cationic UV-curable resins. Free-radical UV-curable resins are oligomers with unsaturated double bonds, such as acryloyloxy, methacryloxy, vinyl, and allyl groups. Cationic UV-curable resins are those with epoxy or vinyl groups, such as epoxy resins and vinyl ether resins.
[0044] In other embodiments, the plurality of protrusions 124 or the plurality of prism grooves 125 are integrally formed with the light guide film 12. It is understood that the light guide film 12 having the plurality of protrusions 124 or the plurality of prism grooves 125 can be prepared by injection molding.
[0045] Understandably, in related technologies, backlight modules mainly consist of light-emitting components paired with light guide plates. The light guide plates are created by laser engraving, V-shaped cross-grid engraving, and UV screen printing techniques on a substrate to print light guide points. Therefore, the light guide plate is relatively expensive and complex to manufacture due to the need for a combination of spectral analysis principles and printing technology. However, in this embodiment, the corresponding light guide film 12 can be obtained simply by rolling or injection molding on the first and second soft resins. Compared to related technologies, the process of the light guide film 12 in this embodiment is simple and easy to operate.
[0046] The thickness of the light guide film 12 is 0.3 mm to 1 mm. As can be seen, the relatively small thickness of the light guide film 12 effectively reduces the thickness of the side-lit backlight module 10 utilizing the light guide film 12, thereby reducing the thickness of the display device 100 utilizing the side-lit backlight module 10. It is worth noting that the thickness of the light guide plate in the related art is approximately 2 mm. The light guide film 12 in this embodiment is thinner than the light guide plate in the prior art, which is beneficial for the thinning of the side-lit backlight module 10 equipped with the light guide plate.
[0047] The light guide film 12 can be made of at least one of PET (polyethylene glycol terephthalate), PC (polycarbonate), PMMA (polymethyl methacrylate), MS (styrene-methylmethacrylate copolymer), and glass.
[0048] Please see Figure 5 as well as Figure 6 , Figure 5 This is a schematic diagram of a second structure of the light guide film provided in an embodiment of this application. Figure 6 for Figure 5 A magnified view of part A.
[0049] When the prism groove 125 is prism-shaped, the prism has multiple planes that can reflect light, allowing the light to be reflected in multiple directions, thereby transforming a line light source into a surface light source, making the light softer. The prism can be an oblique prism, a right prism, or a regular prism. It is understood that, in the direction from near to away from the light source assembly 11, the distance between the geometric centers of each prism remains constant, while the number of edges of the prism gradually increases. It is understood that the more edges of the prism, the more groove walls facing different directions, and the more directions of light reflected through the groove walls, making the amount of reflection approximately consistent in the direction away from the light source assembly 11, thus achieving light uniformity.
[0050] Please continue reading. Figure 6 , Figure 7 as well as Figure 8 , Figure 7 This is a schematic diagram of a third structure of the light guide film provided in an embodiment of this application. Figure 8 for Figure 7 A magnified view of part B.
[0051] In some embodiments, the plurality of protrusions 124 may be arranged in an array; in other embodiments, the size or distribution density of the plurality of protrusions 124 may gradually increase in the direction from the light source component 11 to the distance from the light source component 11. In one case, since some light is first reflected by the plurality of prism grooves 125 on the light guide film 12 and then converged by the plurality of protrusions 124 on the light guide film 12, if the light reflected by the prism grooves 125 is already sufficiently uniform under the action of the plurality of prism grooves 125, the array distribution of the plurality of protrusions 124 increases the brightness of the light emitted from the light guide film 12. In another case, if the light reflected by the prism grooves 125 is not uniform enough under the action of the plurality of prism grooves 125, that is, if the brightness of the light far from the light source component 11 is not uniform, then the size or distribution density of the protrusions 124 is large far from the light source component 11, making the brightness of the light uniform, so that the side-lit backlight module 10 can obtain uniform and bright light. Among them, the light rays of the protrusion 124 are as follows Figure 6 hemispherical or like Figure 8 , pyramid.
[0052] In some embodiments, please continue reading Figure 2 The side-lit backlight module 10 also includes a first substrate 14, which is disposed on a first side surface 121. A plurality of first microprisms 141 are disposed on the side of the first substrate 14 away from the light guide film 12, and the extension directions of the plurality of first microprisms 141 are all parallel to the first direction.
[0053] Understandably, light rays along a third direction within the light guide film 12 are emitted to the first microprism 141. The first microprism 141 can converge the incident light, thereby controlling the emission angle of the light rays emitted from the first microprism 141 within a first range, thus increasing the brightness of the light within that first range. The first microprism 141 can be a triangular prism. The third direction intersects with the first direction.
[0054] In some embodiments, please continue reading Figure 2The side-lit backlight module 10 also includes a second substrate 15, which is disposed on the side of the first substrate 14 away from the light guide film 12. A plurality of second microprisms 151 are disposed on the side of the second substrate 15 away from the light guide film 12, and the extension directions of the plurality of second microprisms 151 are all parallel to a second direction, which intersects the first direction. The angle at which the first direction intersects the second direction can be 30 degrees, 60 degrees, or 90 degrees. Optionally, the first direction is perpendicular to the second direction. When the first direction is perpendicular to the second direction, the first microprism 141 and the second microprism 151 have different effects on light at different angles, so the effects of the first microprism 141 and the second microprism 151 on light can be complementary, thereby affecting all light emitted from the light guide film 12.
[0055] Understandably, light rays along the fourth direction within the light guide film 12 are emitted to the second microprism 151. The second microprism 151 can converge the incident light, thereby controlling the emission angle of the light rays emitted from the second microprism 151 within a second range, thus increasing the brightness of the light within that second range. The second microprism 151 can be a triangular prism. The fourth direction intersects with the second direction.
[0056] The light-emitting unit 112 can be an LED (Light-Emitting Diode), a Mini LED (Mini Light-Emitting Diode), or a Micro LED (Micro Light-Emitting Diode). When the light-emitting unit 112 is a Mini LED, a single row or multiple rows of light-emitting units 112 are arranged along the length direction of the substrate 111, so that the Mini LED can be used in conjunction with the side-lit backlight module 10 and the thinned light guide film 12 to improve the light energy coupling utilization rate.
[0057] The substrate 111 may be provided with circuits, which are connected to the light-emitting unit 112 to provide electrical signals to the light-emitting unit 112.
[0058] The photomask 113 is spherical, and its interior is a neutral and uniform diffuse reflective surface. The diffuse reflective surface has the same diffuse reflectance for light of all wavelengths, and the diffuse reflectance is ≥97%.
[0059] It is understood that when there are multiple light-emitting units 112, the multiple light-emitting units 112 are arranged sequentially along the length direction of the substrate 111. The number of photomasks 113 can be one or more. When there are multiple photomasks 113, the number of multiple photomasks 113 corresponds one-to-one with the number of light-emitting units 112, and each photomask 113 covers one light-emitting unit 112. When there is only one photomask 113, one photomask 113 can illuminate multiple light-emitting units 112.
[0060] In some embodiments, the number of light-emitting units 112 is n, and m light-emitting units 112 form a light-emitting set. Multiple light-emitting sets are arranged sequentially along the length of the substrate 111, and the m light-emitting units 112 in each light-emitting set are arranged sequentially along a length perpendicular to the substrate 111, where n ≥ m. The number of photomasks 113 is also multiple, with each photomask corresponding to one of the multiple light-emitting sets, and each photomask 113 covering one light-emitting set. For example, please refer to [reference needed]. Figure 9 , Figure 9 This is a schematic diagram of a third structure of the side-lit backlight module provided in this application embodiment. The number of light-emitting units 112 in this light-emitting assembly is two, i.e., m is 2. One photomask covers one light-emitting assembly. It is understood that the light generated by multiple light-emitting units 112 is stronger than the light generated by a single light-emitting unit 112. Compared to a single light-emitting unit 112, more light can enter the light guide film 12, improving the light energy coupling utilization rate. Optionally, the light-emitting unit 112 can be a Mini LED.
[0061] Please see Figure 10 , Figure 10 This is a schematic diagram of the structure of the display device provided in the embodiments of this application.
[0062] This application embodiment also provides a display device 100, which includes the aforementioned side-lit backlight module 10 and liquid crystal module 20. The liquid crystal module 20 is disposed above the backlight module, and the backlight module can generate light and direct it toward the liquid crystal screen of the liquid crystal module 20 to realize the image display function of the liquid crystal screen.
[0063] The display device 100 can be any device or component with display function, such as an LCD module 20, electronic paper, mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.
[0064] The side-lit backlight module 10 provided in this application embodiment includes a light source assembly 11, a light guide film 12, and a reflector 13. The light emitted by the light-emitting unit 112 of the light source assembly 11 is reflected on the inner wall of the light cover 113 and then enters the light guide film 12 through the third side 123. It is reflected on the groove wall of the prism groove 125. The farther away from the light source assembly 11, the larger the area or number of the groove wall, so that the amount of reflection is approximately consistent in the direction away from the light source assembly 11 and the light is uniform. The reflected light is reflected again by the reflector 13 located on the second side 122 and then converged by multiple protrusions 124 on the first side 121, thereby improving the brightness of the light and obtaining uniform and bright light.
[0065] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0066] In the description of this application, the terms "first" and "second" are used 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, features defined with "first" and "second" may explicitly or implicitly include one or more features.
[0067] The side-lit backlight module and display device provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application, and the descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.
Claims
1. A side-lit backlight module, characterized in that, include: A light source assembly includes a substrate, a light-emitting unit, and a photomask. The light-emitting unit is disposed on the substrate, and the light-emitting surface of the light-emitting unit is concave. The photomask is connected to the substrate and has a receiving cavity, a first opening communicating with the receiving cavity, and a second opening. The photomask is disposed on the light-emitting unit through the first opening. A light guide film, the thickness of which is 0.3 mm to 1 mm, is snapped onto a second opening. The light guide film has a first side, a second side opposite to the first side, and a third side connected to both the first and second sides. The first side has multiple protrusions, the size or distribution density of which gradually increases from the direction near the light source assembly to the direction away from the light source assembly. The second side has multiple prism grooves, the size or distribution density of which gradually increases from the direction near the light source assembly to the direction away from the light source assembly. The second side has multiple prisms, adjacent prisms forming prism grooves with the light guide film. Each prism has multiple planes, and each plane reflects light. A reflective sheet, wherein the reflective sheet is disposed below the second side surface; The photomask is spherical, and the interior of the photomask is a neutral and uniform diffuse reflective surface, which has the same diffuse reflectance ratio for light of all wavelengths. The light emitted by the light-emitting unit is reflected on the inner wall of the light cover, enters the light guide film through the third side, and is then reflected by the groove wall of the prism groove and the reflective sheet to the first side, and finally converges by the multiple protrusions.
2. The side-lit backlight module according to claim 1, characterized in that, The multiple protrusions are arranged in an array.
3. The side-lit backlight module according to claim 1 or 2, characterized in that, The protrusion is hemispherical or pyramidal in shape.
4. The side-lit backlight module according to claim 1 or 2, characterized in that, It also includes a first substrate, which is disposed on the first side. A plurality of first microprisms are disposed on the side of the first substrate away from the light guide film, and the extension directions of the plurality of first microprisms are all parallel to the first direction.
5. The side-lit backlight module according to claim 4, characterized in that, It also includes a second substrate, which is disposed on the side of the first substrate away from the light guide film. A plurality of second microprisms are disposed on the side of the second substrate away from the light guide film. The extension directions of the plurality of second microprisms are all parallel to the second direction, and the first direction intersects the second direction.
6. The side-lit backlight module according to claim 1 or 2, characterized in that, The number of light-emitting units is n, and m light-emitting units form a light-emitting set. The multiple light-emitting sets are arranged sequentially along the length direction of the substrate. In each light-emitting set, m light-emitting units are arranged sequentially along the length direction perpendicular to the substrate, where n≥m. The number of photomasks is multiple, and the multiple photomasks correspond one-to-one with the multiple light-emitting sets. Each photomask covers one light-emitting set.
7. A display device, characterized in that, Includes the side-lit backlight module as described in any one of claims 1 to 6.