Light source module, image generation apparatus, display device, and transport vehicle

Abstract

Embodiments of the present application relate to the field of light structures and disclose a light source module, an image generation apparatus, a display device, and a transport vehicle, aiming to mitigate the problem of light source modules having a low level of integration. The specific solution is: the light source module comprises a substrate, a first light source, a second light source, and a third light source. The first light source, the second light source, and the third light source are arranged side by side in a first direction and are connected to the same side of the substrate. The light-emitting directions of the first light source, the second light source, and the third light source are parallel, and the luminous efficiencies of the first light source, the second light source, and the third light source decrease one by one. The three light sources share the substrate, so that the level of integration of the light source module can be increased. The space occupied by the three light sources arranged side by side is small, which is beneficial for reducing the size of the light source module and increasing the level of integration of the light source module. When the light source module is applied to an image generation apparatus, the luminous fluxes of light of the three light sources propagated to a light homogenizing element are similar, thereby ensuring uniform image colors.

Description

Light source module, image generating device, display device and vehicle

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on September 28, 2023, with application number 202311294921.9 and application name “Light source module, image generating device, display device and vehicle”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the field of optical structures, and in particular to a light source module, an image generating device, a display device, and a vehicle. Background Art

[0003] With the development of display technology, display technology has been widely used in various fields. For example, a head-up display (HUD) is installed on a vehicle to project an image into the driver's field of view.

[0004] As consumers demand smaller displays, how to improve the integration of various components in the display has also been proposed accordingly, for example, how to improve the integration of light sources in the display.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a light source module, an image generating device, a display device, and a vehicle, which improve the problem of low integration of the light source module.

[0007] In order to achieve the above objectives, this application adopts the following technical solutions.

[0008] In the first aspect, an embodiment of the present application provides a light source module. The light source module includes a substrate, a first light source, a second light source and a third light source. The first light source, the second light source and the third light source are arranged side by side along a first direction and are all connected to the same side of the substrate; the light emitting directions of the first light source, the second light source and the third light source are parallel. The first light source, the second light source and the third light source share a substrate, which can improve the integration of the light source module. Compared with the three light sources arranged in a triangular distribution, the three light sources arranged side by side occupy less space, which is conducive to reducing the volume of the light source module and improving the integration of the light source module. In addition, the first light source, the second light source and the third light source are connected to the same side of the substrate. During the installation process, they can be installed on the same side of the substrate, which is conducive to improving installation efficiency.

[0009] In conjunction with the first aspect, in some achievable embodiments, the luminous efficiencies of the first, second, and third light sources decrease successively. Because the first, second, and third light sources have a certain volume, the light-emitting points of the first, second, and third light sources do not overlap, and the optical axes of the light rays emitted by the first, second, and third light sources do not overlap. Because the light emission directions of the first, second, and third light sources are parallel, the optical axes of the light rays from the three light sources are parallel when they leave the light source module. Furthermore, because the first, second, and third light sources are arranged side by side along a first direction, the optical axes of the light rays emitted by the three light sources in the light source module are arranged side by side along the first direction. When the light source module is used in an image generation device, the image generation device's light homogenization element needs to homogenize the light rays emitted by the first, second, and third light sources. To increase the integration of the image generation device, the light rays emitted by the first, second, and third light sources propagate to the same area of ​​the same light homogenization element, that is, the optical axes of the light rays from the three light sources need to be coaxial when they propagate to the light homogenization element. In this way, the light emitted by the three light sources in the light source module needs to be redirected from parallel optical axes to coaxial optical axes by an optical element (e.g., a reflector). To reduce the number of optical elements (e.g., reflectors) and the volume they occupy, the directions of the three optical axes can be redirected once to make them coaxial. Specifically, the three parallel optical axes arranged side by side along the first direction are redirected once by an optical element to make them coaxial. Obviously, if the three coaxial optical axes are parallel to the first direction after the redirection, only one redirection change is required. This is because the first, second, and third light sources are arranged side by side along the first direction. After the redirection, the distances from the light rays of the three light sources propagating along the first direction to the homogenizer decrease gradually. For example, if the first light source is further away from the homogenizer than the second light source, the optical path from the light rays emitted by the first light source to the homogenizer is greater than the optical path from the light rays emitted by the second light source to the homogenizer, and greater than the optical path from the light rays emitted by the third light source to the homogenizer. Given equal luminous efficiency, a longer optical path results in a lower luminous flux. Furthermore, the luminous efficiency of the first, second, and third light sources decreases gradually. The longer the optical path, the greater the light efficiency. When the light emitted by the first, second, and third light sources reaches the light homogenizing element, the difference in luminous flux is small, resulting in a uniform color of the image light emitted by the image generating device. Therefore, the side-by-side arrangement of the first, second, and third light sources, each with decreasing luminous efficiency, can achieve a higher degree of integration and more uniform color in the image generating device.

[0010] In conjunction with the first aspect, in some achievable embodiments, the light source module further includes: a controller. The first light source, the second light source, and the third light source are all signal-connected to the controller; the controller is configured to control the electrical signals input to the first light source, the second light source, and the third light source to decrease one by one. Thus, the controller controls the magnitude of the input electrical signals to gradually decrease the luminous efficiency of the first light source, the second light source, and the third light source. Furthermore, the difference in luminous flux between the light emitted by the first light source, the second light source, and the third light source when it propagates to the light homogenizing element is minimized, thereby making the color of the image light emitted by the image generating device uniform.

[0011] In conjunction with the first aspect, in some achievable embodiments, the controller is configured to control the current input to the first light source, the second light source, and the third light source to decrease one by one. Alternatively, the controller is configured to control the voltage input to the first light source, the second light source, and the third light source to decrease one by one. Decreasing the current one by one or decreasing the voltage one by one can cause the luminous efficiency of the first light source, the second light source, and the third light source to decrease one by one. This reduces the difference in luminous flux between the light emitted by the first light source, the second light source, and the third light source when it propagates to the light homogenizing element, thereby making the color of the image light emitted by the image generating device uniform.

[0012] In combination with the first aspect, in some feasible embodiments, the light source module further includes: a first identification portion and a second identification portion. The first identification portion and the second identification portion are spaced apart on the substrate; the vertical projection of the first identification portion on the surface of the substrate does not overlap with the first light source, the second light source, and the third light source; the vertical projection of the second identification portion on the surface of the substrate does not overlap with the first light source, the second light source, and the third light source. The first identification portion and the second identification portion will not be covered by the connection area between the three light sources and the substrate, thereby avoiding the first identification portion and the second identification portion being covered by the three light sources and failing to mark the positions of the three light sources and the rotation angle of the light-emitting surface. Because the first identification portion and the second identification portion are spaced apart, the auxiliary line connecting the first identification portion and the second identification portion can mark the position of the light source and the rotation angle of the light-emitting surface. The position of the light source and the rotation angle of the light-emitting surface are marked, making the coordinate position of the light source and the rotation angle of the light-emitting surface more accurate.

[0013] In combination with the first aspect, in some feasible embodiments, the substrate includes a first base plate and a first insulating layer that are stacked, the first insulating layer faces the first light source, and the first light source, the second light source, and the third light source all pass through the first insulating layer and are connected to the first base plate. The first identification portion includes a first through hole, and the second identification portion includes a second through hole; the first through hole and the second through hole are arranged in the first insulating layer. The first insulating layer can prevent the conductive structure (such as a metal wire) on the first base plate from short-circuiting with other electrical devices. In the process of forming the first insulating layer, an insulating film can be formed first, and the insulation can be etched to form the first insulating layer. In the process of forming the first insulating layer, the first through hole and the second through hole can be etched to form the first identification portion and the second identification portion, and the first identification portion and the second identification portion can be formed without an additional process, saving process costs.

[0014] In conjunction with the first aspect, in some achievable embodiments, the first light source includes a light-emitting device and a lens assembly; the light-emitting device is connected to the substrate, and the lens assembly is connected to an end of the light-emitting device facing away from the substrate. In this way, the lens assembly can shape the light emitted by the light-emitting device to obtain a target light beam.

[0015] In combination with the first aspect, in some feasible embodiments, the substrate is provided with a reflective area; the reflective area is located on the side of the substrate facing the lens assembly; the vertical projection of the light-emitting device on the surface of the substrate and the reflective area do not overlap, and the vertical projection of the lens assembly on the surface of the substrate and the reflective area at least partially overlap. Because the vertical projection of the light-emitting device on the surface of the substrate and the reflective area do not overlap, when using a laser to measure the distance between the lens assembly and the surface of the substrate, when the laser is vertically incident on the reflective area, the laser can avoid the light-emitting device to prevent the light-emitting device from blocking the laser. Because the vertical projection of the lens assembly on the surface of the substrate and the reflective area at least partially overlap, the laser can transmit through the lens assembly to the reflective area and be emitted to measure the distance between the lens assembly and the substrate. The provision of the reflective area can assist in determining the distance between the lens assembly and the surface of the substrate, improve the installation accuracy of the lens assembly, and improve the optical performance of the light source module.

[0016] In conjunction with the first aspect, in some achievable embodiments, the substrate includes a second base plate and a second insulating layer stacked together, the second insulating layer being located between the lens assembly and the second base plate; the light-emitting device extends through the second insulating layer and is connected to the second base plate; the second insulating layer is provided with a mounting hole extending therethrough, and the reflective area is located within the mounting hole. During the process of forming the second insulating layer, an insulating film may be first formed, and then the insulating film may be etched to form the second insulating layer. The mounting hole may be formed during the etching process, and no additional process may be required.

[0017] In combination with the first aspect, in some feasible embodiments, the light source module further includes: a bracket. The bracket is connected to the side of the substrate facing the first light source, and the bracket is provided with a first light-transmitting hole, a second light-transmitting hole and a third light-transmitting hole. The first light source is located in the first light-transmitting hole, the second light source is located in the second light-transmitting hole, and the third light source is located in the third light-transmitting hole. The first light source, the second light source and the third light source are connected to the same bracket, which can increase the integration of the light source module. In addition, when the bracket is connected to one of the light sources (for example, the first light source), the relative positions of the remaining two light sources and the bracket are fixed, which saves the installation procedure and reduces the installation cost.

[0018] In conjunction with the first aspect, in some achievable embodiments, the light source module further includes an assembly plate. The substrate and the assembly plate are perpendicular to each other, and the light emission direction of the first light source faces away from the assembly plate. When the light source module is connected to a structure such as a housing, the connection can be via the assembly plate and the housing. Heat from the first, second, and third light sources is transferred to the assembly plate via the substrate, and then to the housing.

[0019] In conjunction with the first aspect, in some achievable embodiments, the substrate and the assembly plate are connected to form an integrally formed part, so that heat from the substrate can be better transferred to the assembly plate, thereby improving the heat dissipation performance of the light source module.

[0020] In conjunction with the first aspect, in some achievable embodiments, the first light source includes a green light-emitting element; the second light source includes a blue light-emitting element; and the third light sources each include a red light-emitting element; the green light-emitting element, the blue light-emitting element, and the red light-emitting element are all connected to the same side of the substrate. Light emitted by the first, second, and third light sources can be modulated to produce white light.

[0021] In a second aspect, an embodiment of the present application provides an image generating device. The image generating device includes: a light homogenizing element and any one of the light source modules provided in the first aspect above, wherein the light homogenizing element is used to homogenize the light emitted by the first light source, the second light source, and the third light source. The optical path of the light emitted by the first light source, the second light source, and the third light source to the light homogenizing element increases one by one. Because the integration of the light source module is high, the integration of the image generating device is also correspondingly high, and the volume occupied by the image generating device is small.

[0022] In combination with the second aspect, in some feasible embodiments, the image generating device further includes: a first reflecting element, a second reflecting element, and a third reflecting element arranged side by side along the first direction. The first reflecting element is used to reflect the light emitted by the first light source and then project it through the second reflecting element and the third reflecting element in sequence to the light homogenizing element. The second reflecting element is used to reflect the light emitted by the second light source and then project it through the third reflecting element to the light homogenizing element. The third reflecting element is used to reflect the light emitted by the third light source to the light homogenizing element. Thus, the first reflecting element, the second reflecting element, and the third reflecting element can change the direction of the light beams of the three light sources so that the directions of the light beams of the three light sources pass through the same light homogenizing element. This increases the degree of integration of the image generating device.

[0023] In a third aspect, embodiments of the present application provide a display device. The display device comprises: a processor and any one of the image generation devices provided in the second aspect; the processor is configured to send image data to the image generation device. Because the image generation device has a high level of integration, the display device also has a high level of integration, resulting in a compact size.

[0024] In a fourth aspect, embodiments of the present application provide a vehicle. The vehicle includes a reflective element and any of the display devices provided in the third aspect. The display device is configured to emit a light beam, and the reflective element is configured to reflect the light beam emitted by the display device. Because the display device is compact, it occupies less space in the vehicle, improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1a is a schematic structural diagram of a vehicle.

[0026] Figure 1b is a schematic diagram of the optical path structure of an AR-HUD.

[0027] FIG2 is a schematic diagram of the internal structure of the image generating device provided in an embodiment of the present application.

[0028] FIG3 is a schematic structural diagram of a light source and a light diffuser in the related art.

[0029] FIG4 is a schematic diagram of the exploded structure of the light source module provided in an embodiment of the present application.

[0030] FIG5 is a schematic structural diagram of a light source module according to an embodiment of the present application.

[0031] FIG6 is a schematic structural diagram of a substrate and a lens assembly provided in an embodiment of the present application.

[0032] FIG7 is a schematic structural diagram of another image generating device provided in an embodiment of the present application.

[0033] FIG8 is a schematic structural diagram of another image generating device provided in an embodiment of the present application.

[0034] In the figure: 10-display device; 20-vehicle; 21-reflecting element; 11-image generating device; 100-light source module; 12-processor; 13-light homogenizing element; 14-light modulator; 110-first light source; 120-second light source; 130-third light source; 101-first light beam; 102-second light beam; 103-third light beam; 01-light source; 02-light homogenizing plate; 001-first light-emitting group; 002-second light-emitting group; 003-third light-emitting group; 004-base; 104-first reflecting element; 105-second reflecting element; 106- The third reflecting element; 140-substrate; 141-first base plate; 142-second base plate; 144-assembly plate; 150-bracket; 151-first light-transmitting hole; 152-second light-transmitting hole; 153-third light-transmitting hole; 161-first identification portion; 162-second identification portion; 171-first insulating layer; 172-first through hole; 173-second through hole; 174-second insulating layer; 175-mounting hole; 111-light-emitting device; 112-lens assembly; 1121-first collimating mirror; 1122-second collimating mirror; 180-reflective area; 201-controller. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of this application clearer, this application will be further described in detail below with reference to the accompanying drawings.

[0036] Hereinafter, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified with "first," "second," etc., may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0037] In addition, in this application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to changes in the orientation of the components in the drawings.

[0038] The present application provides a vehicle, including but not limited to a vehicle, a ship, an aircraft, etc., and the following description uses a vehicle as an example. The vehicle can be a car, a bus, a truck, or a toy car. FIG1a uses a vehicle as an example for description.

[0039] Figure 1a is a schematic structural diagram of a vehicle 20. As shown in Figure 1a, the vehicle 20 includes a reflective element 21 and a display device 10. The display device 10 is used to emit a light beam, and the reflective element 21 is used to reflect the light beam emitted by the display device 10.

[0040] The embodiment of the present application does not limit the position of the display device 10 on the vehicle 20. In some embodiments, the display device 10 is integrated into a head-up display (HUD), and the image projected by the head-up display is reflected by the reflective element 21 to form a virtual image outside the vehicle. The head-up display can project the status information of the vehicle, indication information of external objects, navigation information, etc. into the driver's front field of view to prevent the driver from looking down at this information, thereby affecting driving safety. Exemplarily, the aforementioned status information includes information such as driving speed, mileage, fuel level, water temperature, and light status. The indication information of external objects includes safe distance, surrounding obstacles, and reversing images, etc. Navigation information includes direction arrows, distance, and driving time, etc.

[0041] Exemplarily, the reflective element 21 may be a windshield. The windshield has a reflective property and can reflect the image light emitted by the display device 10 to the human eye.

[0042] Types of head-up displays include, but are not limited to, a combined head-up display (C-HUD), a windshield head-up display (W-HUD), and an augmented reality head-up display (AR-HUD). This embodiment of the present application uses the display device 10 integrated into an AR-HUD as an example for description.

[0043] Figure 1b is a schematic diagram of the optical path structure of an AR-HUD. Referring to Figure 1b, a display device 10 includes a picture generation unit (PGU) 11 and a processor 12. The image generation unit 11 and the processor 12 are signal-connected, and the processor 12 is configured to send image data to the image generation unit 11. For example, the display device 10 may include one or more processors 12, such as a graphics processing unit (GPU).

[0044] Figure 2 is a schematic diagram of the internal structure of the image generating device 11 provided in an embodiment of the present application. Referring to Figure 2, the image generating device 11 includes a light source module 100 and a light homogenizing element 13. The light output by the light source module 100 is homogenized after propagating to the light homogenizing element 13, and then modulated after homogenization. For example, the image generating device 11 also includes a light modulator 14, which is used to modulate the light emitted by the light homogenizing element 13. The light modulator 14 is signal-connected to the processor 12 (as shown in Figure 1b). The light modulator 14 receives image data from the processor 12 (as shown in Figure 1b) and modulates the light beam output by the light source module 100 according to the image data to generate imaging light including image information. After the imaging light propagates to the reflective element 21, it is reflected by the reflective element 21 (as shown in Figure 1b) and enters the human eye.

[0045] The light source module 100 includes a first light source 110, a second light source 120, and a third light source 130. The first light source 110 emits a first light beam 101, the second light source 120 emits a second light beam 102, and the third light source 130 emits a third light beam 103. The light homogenizing element 13 is required to homogenize the first light beam 101, the second light beam 102, and the third light beam 103.

[0046] Figure 3 is a schematic diagram of the structure of a light source 01 and a light diffuser 02 in the related art. Referring to Figure 3, light source 01 includes a first light-emitting group 001, a second light-emitting group 002, a third light-emitting group 003, and a base 004. The first, second, and third light-emitting groups 001, 002, and 003 are all connected to base 004. Light diffuser 02 is located on the light-emitting side of the first, second, and third light-emitting groups 001, 002, and 003.

[0047] In Figure 3, to ensure that the light fluxes of the light emitted by the first, second, and third light groups 003 are equal when they reach the diffuser 02, the light from the first light group 001 is directed leftward, the light from the second light group 002 is directed rightward, and the light from the third light group 003 is directed downward. Furthermore, through optical path design, the optical path n1 from the first light group 001 to the diffuser 02, the optical path n2 from the second light group 002 to the diffuser 02, and the optical path n3 from the third light group 003 to the diffuser 02 are equal.

[0048] As can be seen in Figure 3, the first, second, and third light-emitting groups 001, 002, and 003 are installed in different positions, requiring individual alignment, resulting in reduced installation accuracy. Furthermore, each light-emitting group includes a copper plate, a mirror frame, an LED (light emitting diode) light source, and a collimator. Because the three light-emitting groups are installed in different positions, each requires its own copper plate, mirror frame, and other structures, resulting in a low level of integration. Clearly, the image generation device, including the light source 01 and the light diffuser 02 shown in Figure 3, is relatively large and has a low level of integration.

[0049] The light source module 100 provided in the embodiment of the present application has the advantage of high integration. The image generating device 11 including the light source module 100 also has the advantage of high integration.

[0050] As shown in FIG2 , the first light source 110, the second light source 120, and the third light source 130 are arranged side by side along a first direction. For ease of description, the first direction is defined as the x-direction. The light source module 100 also includes a substrate 140, and the first light source 110, the second light source 120, and the third light source 130 are all connected to the same side of the substrate 140. The first light source 110, the second light source 120, and the third light source 130 have the same light emission direction.

[0051] The first, second, and third light sources 110, 120, and 130 are connected to the same side of the substrate 140. The three light sources share the same substrate 140, which improves the integration of the light source module 100. Furthermore, the three light sources are arranged side by side. Compared to a triangular arrangement of the three light sources, the three light sources arranged side by side occupy less space, which helps reduce the volume of the light source module 100. Furthermore, because the first, second, and third light sources 110, 120, and 130 are located on the same side of the substrate 140, the three light sources have less freedom to assemble during assembly, which helps improve installation accuracy.

[0052] In FIG2 , because the first light source 110, the second light source 120, and the third light source 130 have a certain volume, there is a certain distance (e.g., distance d in FIG2 ) between the light-emitting point of the first light source 110 and the light-emitting point of the second light source 120. Similarly, there is a certain distance between the light-emitting point of the second light source 120 and the light-emitting point of the third light source 130. The light-emitting points of the first light source 110, the second light source 120, and the third light source 130 do not overlap.

[0053] In some embodiments, to further increase the integration of the image generating device 11, the first light beam 101, the second light beam 102, and the third light beam 103 share the same light homogenizing element 13, and the first light beam 101, the second light beam 102, and the third light beam 103 pass through the same area of ​​the light homogenizing element 13 in the same direction. In other words, when the first light beam 101, the second light beam 102, and the third light beam 103 propagate to the light homogenizing element 13, the optical axes of the first light beam 101, the second light beam 102, and the third light beam 103 are coaxial.

[0054] In addition, to make the image light emitted by the image generating device 11 uniform in color, the luminous fluxes of the first light beam 101, the second light beam 102, and the third light beam 103 are equal when propagating to the light homogenizing element 13. The luminous flux is related to the distance the light propagates, that is, the optical path.

[0055] In some embodiments of the present application, the luminous efficiencies of the first light source 110, the second light source 120, and the third light source 130 decrease one by one. In other words, the luminous efficiency of the first light source 110 is greater than that of the second light source 120, and the luminous efficiency of the second light source 120 is greater than that of the third light source 130.

[0056] As described above, in order to increase the integration of the image generating device 11 , when the first light beam 101 , the second light beam 102 and the third light beam 103 propagate to the light homogenizing element 13 , the optical axes of the first light beam 101 , the second light beam 102 and the third light beam 103 are coaxial.

[0057] In Figure 2, the first light source 110 is further away from the light homogenizing element 13 than the second light source 120. The first light source 110, the second light source 120, and the third light source 130 are arranged side by side along the x-direction, and the light output direction is toward the same side of the substrate 140. Then, the optical axes at the light output ports of the first light source 110, the second light source 120, and the third light source 130 are spaced apart along the x-direction. In order to make the optical axes of the three light sources coaxial when propagating to the light homogenizing element 13, the three optical axes spaced apart along the x-direction need to be changed to coincide. In order to reduce the number of optical elements and the volume occupied during the change of the optical axis, the directions of the three optical axes are changed once respectively. If the three optical axes are perpendicular to the x-direction after the change, the directions of the three optical axes only need to be changed once respectively, and the three optical axes are coaxial after the change.

[0058] Taking the orientation in Figure 2 as an example, the directions of the first light beam 101, the second light beam 102 and the third light beam 103 emitted by the light source module 100 are all facing left. After one change, the first light beam 101, the second light beam 102 and the third light beam 103 all propagate downward through the light homogenizing element 13. The installation position of the elements that change the three propagation directions (such as the reflective element) can be adjusted to make the first light beam 101, the second light beam 102 and the third light beam 103 coaxial during the downward propagation process.

[0059] It can be understood that the coaxiality of the aforementioned first light beam 101, second light beam 102 and third light beam 103 is not limited to the fact that the optical axes of the three light beams need to be collinear. The distance between the optical axes of the three light beams and the angle between the optical axes of the three light beams can be within the working error range. For example, the distance between the optical axes of the three light beams is 0μm to 10μm, and the angle between the optical axes is 0° to 10°.

[0060] In Figure 2 , the directions of the first light beam 101, second light beam 102, and third light beam 103 incident on the light homogenizing element 13 are all in the x-direction. Furthermore, because the first light source 110, second light source 120, and third light source 130 are arranged in the x-direction and are all connected to the substrate 140, the optical path of the first light beam 101 from the emitting position of the first light source 110 to the light homogenizing element 13 is greater than the optical path of the second light beam 102 from the emitting position of the second light source 120 to the light homogenizing element 13, and further greater than the optical path of the third light beam 103 from the emitting position of the third light source 130 to the light homogenizing element 13. Furthermore, because the luminous efficiency of the first light source 110, second light source 120, and third light source 130 decreases successively, in other words, when propagating to the light homogenizing element 13, the optical path of the light beam with greater efficiency is greater, while the optical path of the light beam with less efficiency is smaller. The difference in light flux among the first light beam 101 , the second light beam 102 and the third light beam 103 when they propagate to the light homogenizing element 13 is small, so that the color of the image light emitted by the image generating device 11 is uniform.

[0061] The luminous efficiencies of the first light source 110 , the second light source 120 and the third light source 130 decrease one by one, which can be achieved by the structure of the light source, or by controlling the current or voltage input to the light source, or by using both of the above methods.

[0062] In some embodiments of the present application, the light source module 100 further includes a controller 201. The first light source 110, the second light source 120, and the third light source 130 are all signal-connected to the controller 201. The controller 201 is configured to control the electrical signals input to the first light source 110, the second light source 120, and the third light source 130 to decrease one by one. The electrical signals may be current or voltage. In other words, the controller 201 controls the current input to the first light source 110 to be greater than the current input to the second light source 120, and greater than the current input to the third light source 130. Because luminous efficiency and current are positively correlated, a greater input current increases luminous efficiency. Alternatively, the controller 201 controls the voltage input to the first light source 110 to be greater than the voltage input to the second light source 120, and greater than the voltage input to the third light source 130. Because luminous efficiency and voltage are positively correlated, a greater input voltage increases luminous efficiency. In this way, the controller 201 controls the magnitude of the input electrical signals to cause the luminous efficiency of the first light source 110, the second light source 120, and the third light source 130 to decrease one by one. Furthermore, the difference in light flux among the first light beam 101 , the second light beam 102 and the third light beam 103 when they propagate to the light homogenizing element 13 is made smaller, so that the color of the image light emitted by the image generating device 11 is made uniform.

[0063] It is understood that in other embodiments of the present application, the luminous efficiency of the first light source 110, the second light source 120, and the third light source 130 is not limited to decreasing one by one. For example, the luminous efficiency of the first light source 110, the second light source 120, and the third light source 130 can be equal. If the luminous flux of the light from the first light source 110, the second light source 120, and the third light source 130 transmitted to the light homogenizing element 13 differs greatly, the light emitted by the three light sources can be modulated by a processing chip such as a liquid crystal on silicon (LCOS) chip to make the color of the image light emitted by the image generating device 11 uniform. Alternatively, the light emitted by the three light sources can be modulated by an optical element such as an anti-reflection film to make the color of the image light emitted by the image generating device 11 uniform.

[0064] The present embodiment of the present application does not limit the substrate 140. For example, the substrate 140 may be a printed circuit board (PCB). The material of the substrate 140 may include copper, for example. Copper has excellent thermal conductivity and can dissipate heat for the first light source 110, the second light source 120, and the third light source 130, thereby improving the heat dissipation performance of the light source module 100.

[0065] The embodiments of the present application do not limit the colors of the light beams emitted by the first light source 110, the second light source 120, and the third light source 130. For example, the first light source 110 emits green, red, or blue light, the second light source 120 emits green, red, or blue light, and the third light source 130 emits green, red, or blue light. For example, the first light source 110 emits green light, the second light source 120 emits blue light, and the third light source 130 emits red light.

[0066] For example, the first light source 110 includes a green light-emitting element, the second light source 120 includes a blue light-emitting element, and the third light source 130 includes a red light-emitting element. The green light-emitting element, the blue light-emitting element, and the red light-emitting element are all connected to the same side of the substrate 140. It is understood that in other embodiments, the light beams emitted by the first light source 110, the second light source 120, and the third light source 130 can be other colors. They can also be invisible light beams, which is not limited in this embodiment of the present application.

[0067] FIG4 is a schematic diagram of the exploded structure of the light source module 100 provided in an embodiment of the present application. Referring to FIG4 , in some embodiments, the light source module 100 further includes a bracket 150, which is connected to the side of the substrate 140 facing the first light source 110. The bracket 150 is defined by a first light-transmitting hole 151, a second light-transmitting hole 152, and a third light-transmitting hole 153. The first light source 110 is positioned within the first light-transmitting hole 151, the second light source 120 is positioned within the second light-transmitting hole 152, and the third light source 130 is positioned within the third light-transmitting hole 153. In this manner, light emitted by the first light source 110 can be emitted from the first light-transmitting hole 151, light emitted by the second light source 120 can be emitted from the second light-transmitting hole 152, and light emitted by the third light source 130 can be emitted from the third light-transmitting hole 153. Connecting the first, second, and third light sources 110, 120, and 130 to the same bracket 150 increases the integration of the light source module 100. In addition, after the bracket 150 is connected to one of the light sources (eg, the first light source 110 ), the relative positions of the remaining two light sources and the bracket are fixed, thus saving installation procedures and reducing installation costs.

[0068] The present embodiment of the present application does not limit the connection method between the bracket 150 and the substrate 140. For example, the bracket 150 and the substrate 140 are connected by an adhesive layer. Alternatively, the bracket 150 and the substrate 140 are screwed or welded. The present embodiment of the present application does not limit the material of the bracket 150; for example, it can be made of high-temperature resistant plastic.

[0069] As described above, the first light source 110, the second light source 120, and the third light source 130 are spaced apart along the x-direction. In the embodiment of the present application, the distance between the first light source 110, the second light source 120, and the third light source 130 along the x-direction is not limited and can be designed according to actual needs.

[0070] Returning to Figure 2, as mentioned above, the optical axis of the first light beam 101 is perpendicular to the x-direction when it emerges from the first light source 110. In Figure 2, the optical axis of the first light beam 101 when it emerges from the first light source 110 points to the left. Similarly, the optical axes of the second light beam 102 and the third light beam 103 also point to the left when they emerge. When the first light beam 101, the second light beam 102, and the third light beam 103 propagate to the light homogenizing element 13, the optical axes of the first light beam 101, the second light beam 102, and the third light beam 103 are coaxial. Therefore, the propagation directions of the first light beam 101, the second light beam 102, and the third light beam 103 need to be changed during their propagation to the light homogenizing element 13.

[0071] In Figure 2, the image generating device 11 further includes a first reflecting element 104, a second reflecting element 105, and a third reflecting element 106. The first reflecting element 104, the second reflecting element 105, and the third reflecting element 106 are spaced apart along the x-direction. The first reflecting element 104 is configured to reflect the light emitted by the first light source 110 and project it sequentially through the second reflecting element 105 and the third reflecting element 106 to the light homogenizing element 13. The second reflecting element 105 is configured to reflect the light emitted by the second light source 120 and project it sequentially through the third reflecting element 106 to the light homogenizing element 13. The third reflecting element 106 is configured to reflect the light emitted by the third light source 130 to the light homogenizing element 13. In this manner, the arrangement of the first reflecting element 104, the second reflecting element 105, and the third reflecting element 106 allows the first light beam 101, the second light beam 102, and the third light beam 103 to pass through the same light homogenizing element 13.

[0072] Furthermore, the first light beam 101, the second light beam 102, and the third light beam 103 can be projected onto the same area of ​​the light homogenizing element 13 by setting the installation positions of the first reflective element 104, the second reflective element 105, and the third reflective element 106. In this way, the propagation paths of the first light beam 101, the second light beam 102, and the third light beam 103 can be changed.

[0073] As mentioned above, the light emitted by the first light source 110 needs to pass through the second reflecting element 105 and the third reflecting element 106. During this process, the luminous flux of the light emitted by the first light source 110 is lost. The light emitted by the second light source 120 needs to pass through the third reflecting element 106. During this process, the luminous flux of the light emitted by the second light source 120 is lost. During the propagation process, the luminous flux losses of the light emitted by the first light source 110, the second light source 120 and the third light source 130 are different. In an embodiment in which the luminous efficiency of the first light source 110, the second light source 120 and the third light source 130 decreases one by one. The gradual decrease in luminous efficiency can weaken the aforementioned loss difference, making the difference in the luminous flux of the light from the three light sources projected to the uniform light element 13 smaller. This is conducive to uniform color of the image output by the image generating device 11.

[0074] During the process of connecting the first light source 110, the second light source 120, and the third light source 130 to the substrate 140, in order to ensure that the position coordinates of the first light source 110, the second light source 120, and the third light source 130 installed on the substrate 140 are the designed position coordinates, in some embodiments of the present application, the light source module 100 further includes a first identification portion 161 and a second identification portion 162. The first identification portion 161 and the second identification portion 162 are used to mark the positions of the first light source 110, the second light source 120, and the third light source 130 and the rotation angle of the light-emitting surface.

[0075] The first identification portion 161 and the second identification portion 162 are spaced apart from each other on the substrate 140. The vertical projection of the first identification portion 161 on the surface of the substrate 140 does not overlap with the first light source 110, the second light source 120, and the third light source 130. For example, the vertical projection of the first identification portion 161 on the surface of the substrate 140 does not intersect or completely overlap with the vertical projection of the first light source 110 on the surface of the substrate 140. The relationship between the first identification portion 161 and the second light source 120 or the third light source 130 is similar. The vertical projection of the second identification portion 162 on the surface of the substrate 140 does not overlap with the first light source 110, the second light source 120, and the third light source 130.

[0076] The first identification portion 161 and the second identification portion 162 will not be covered by the connection area between the three light sources and the substrate 140, thereby preventing the first identification portion 161 and the second identification portion 162 from being covered by the three light sources and failing to mark the positions of the three light sources and the rotation angle of the light-emitting surface.

[0077] Because first marking portion 161 and second marking portion 162 are spaced apart, the auxiliary line connecting first marking portion 161 and second marking portion 162 can mark the position of the light source and the rotation angle of the light-emitting surface. The position of the light source and the rotation angle of the light-emitting surface are marked, making the coordinate position of the light source and the rotation angle of the light-emitting surface more accurate.

[0078] The embodiment of the present application does not limit the relative positions of the first identification portion 161 and the second identification portion 162 and the three light sources.

[0079] Figure 5 is a schematic diagram of the structure of light source module 100 according to an embodiment of the present application. In Figure 5 , the distance between first identification portion 161 and first light source 110 is a1, and the distance between second identification portion 162 and first light source 110 is a2. Once a1 and a2 are determined, the position of first light source 110 is uniquely determined, thereby achieving the purpose of marking first light source 110.

[0080] For example, the angle between the auxiliary line and the line connecting any point on the auxiliary line and the light-emitting surface of the first light source 110 can be used to determine the rotation angle of the light-emitting surface of the first light source 110. Figure 5 uses the angle between the auxiliary line and the line connecting the point on the auxiliary line where the first identification portion 161 is located and the light-emitting surface of the first light source 110 as an example. It will be understood that in examples with a large light-emitting surface area, the aforementioned connecting line can be a line connecting the geometric center of the light-emitting surface and any point on the auxiliary line. Alternatively, the aforementioned connecting line can be a line connecting the midpoint of the edge of the light-emitting surface and any point on the auxiliary line.

[0081] In Figure 5, when the position of the first light source 110 is uniquely determined, the angle between the light-emitting surface of the first light source 110 and the auxiliary line has multiple values. For example, when the installation posture of the first light source 110 is posture one, the angle between the light-emitting surface of the first light source 110 and the auxiliary line is β. When the installation posture of the first light source 110 is posture two, the angle between the light-emitting surface of the first light source 110 and the auxiliary line is α. Obviously, the installation posture of the first light source 110 can be determined by detecting the angle between the light-emitting surface of the first light source 110 and the auxiliary line. The embodiment of the present application does not limit the shape of the light-emitting surface. For example, the light-emitting surface can be a rectangle.

[0082] Similarly, the first identification portion 161 and the second identification portion 162 can mark the position of the first light source 110 and the rotation angle of the light-emitting surface, which will not be described in detail here.

[0083] The embodiments of the present application do not limit the structures of the first identification portion 161 and the second identification portion 162. For example, the first identification portion 161 is a groove structure provided on the substrate 140; or, the first identification portion 161 is a protrusion provided on the substrate 140. Alternatively, the first identification portion 161 is a coating connected to the substrate 140. Furthermore, the shape of the first identification portion 161 can be a number, a letter, a Chinese character, or an irregular shape. The same applies to the second identification portion 162 and will not be further described here.

[0084] Please return to Figure 4. In the example of Figure 4, the substrate 140 includes a first base plate 141 and a first insulating layer 171 stacked together, and the first insulating layer 171 covers the surface of the first base plate 141 facing the first light source 110. The first identification portion 161 includes a first through hole 172, and the second identification portion 162 includes a second through hole 173. The first through hole 172 and the second through hole 173 are provided in the first insulating layer 171. The first insulating layer 171 can prevent the conductive structure (such as a metal wire) on the first base plate 141 from short-circuiting with other electrical components. In the process of forming the first insulating layer 171, an insulating film can be formed first, and the insulation can be etched to form the first insulating layer 171. In the process of forming the first insulating layer 171, the first through hole 172 and the second through hole 173 can be etched to form the first identification portion 161 and the second identification portion 162. No additional process is required to form the first identification portion 161 and the second identification portion 162, thereby saving process costs.

[0085] In an embodiment where the first base plate 141 is made of copper, the first through-hole 172 penetrates the first insulating layer 171 to expose the surface of the first base plate 141. The excellent glossiness of copper makes the first identification portion 161 more easily recognizable. During installation, the position of the first identification portion 161 can be quickly determined, and the second identification portion 162 can similarly be quickly identified, thereby improving the installation efficiency of the light source module 100.

[0086] The embodiment of the present application does not limit the material of the first insulating layer 171 . Exemplarily, the material of the first insulating layer 171 includes liquid photoresist (also known as green oil).

[0087] The present embodiment does not limit the structure of the first light source 110. In Figure 4, the first light source 110 includes a light-emitting device 111 and a lens assembly 112. The light-emitting device 111 is connected to a substrate 140, and the lens assembly 112 is located on the light-emitting side of the light-emitting device 111. In this way, the lens assembly 112 can shape the light emitted by the light-emitting device 111 into a target light beam.

[0088] The embodiment of the present application does not limit the type of the light emitting device 111. For example, the light emitting device 111 may be an LED.

[0089] The present embodiment does not limit the structure of the lens assembly 112. In some embodiments, the lens assembly 112 includes a first collimator 1121 and a second collimator 1122, which are stacked in a direction away from the light-emitting device 111. Light emitted by the light-emitting device 111 is collimated after passing through the first collimator 1121 and the second collimator 1122 in sequence.

[0090] Similarly, the second light source 120 and the third light source 130 may also include a light emitting device 111 and a lens assembly 112, which will not be described in detail here.

[0091] In an embodiment where the light source module 100 includes a bracket 150, the lens assembly 112 is connected to the bracket 150. The lens assembly 112 of the first light source 110 is located within and connected to the first light transmission hole 151. The lens assemblies 112 of the second light source 120 and the third light source 130 are connected to the second light transmission hole 152 and the third light transmission hole 153, respectively. The bracket 150 reduces the degree of freedom of the lens assembly 112 and reduces the installation cost. In addition, the three lens assemblies 112 share one bracket 150, which can reduce the number of parts of the light source module 100 and improve the integration.

[0092] In some embodiments, during the installation of the lens assembly 112, it is necessary to determine the distance between the lens assembly 112 and the light-emitting device 111. Alternatively, the distance between the lens assembly 112 and the surface of the substrate 140 may be determined. Typically, a laser test can be used to measure the aforementioned distance. For example, a laser is irradiated onto the substrate 140 and then reflected to a laser receiver to obtain the distance between the substrate 140 and the lens assembly 112. Furthermore, because the surface of the substrate 140 has various structures (e.g., wiring, electrical connectors, etc.), these various structures may affect the reflection of the laser, thereby affecting the measurement results and the installation position of the lens assembly 112.

[0093] FIG6 is a schematic structural diagram of a substrate 140 and a lens assembly 112 provided in an embodiment of the present application. Referring to FIG6 , in some embodiments, the substrate 140 is provided with a reflective region 180. The reflective region 180 is located on the side of the substrate 140 facing the lens assembly 112. The vertical projection of the light-emitting device 111 on the surface of the substrate 140 does not overlap with the reflective region 180, and the vertical projection of the lens assembly 112 on the surface of the substrate 140 (region c in FIG6 ) at least partially overlaps with the reflective region 180. Because the vertical projection of the light-emitting device 111 on the surface of the substrate 140 does not overlap with the reflective region 180, when the laser is vertically incident on the reflective region 180, the laser can avoid the light-emitting device 111, preventing the light-emitting device 111 from blocking the laser. Because region c and the reflective region 180 at least partially overlap, region c is closer to the light-emitting device 111, and the laser has a higher precision when measuring the distance h between the reflective region 180 and the substrate 140, making the measurement more accurate. In this way, the provision of the reflective area 180 is helpful in assisting in determining the distance h between the lens assembly 112 and the surface of the substrate 140 , thereby improving the installation accuracy of the lens assembly 112 and the optical performance of the light source module 100 .

[0094] The vertical projection of the aforementioned light-emitting device 111 on the surface of the substrate 140 and the reflective area 180 do not overlap, including: the vertical projection of the light-emitting device 111 on the surface of the substrate 140 and the reflective area 180 are arranged at intervals, or a part of the reflective area 180 is within the vertical projection of the light-emitting device 111 on the surface of the substrate 140, and a part is outside the projection.

[0095] Similarly, the aforementioned c-region and the reflective region 180 at least partially overlap, including: the c-region and the reflective region 180 overlap, or the reflective region 180 is partially within the c-region and partially outside the c-region.

[0096] In the example of FIG6 , the substrate 140 includes a second base plate 142 and a second insulating layer 174. The end of the light-emitting device 111 away from the lens assembly 112 passes through the second insulating layer 174 and is connected to the substrate 140. The second insulating layer 174 is located between the lens assembly 112 and the second base plate 142. The second insulating layer 174 is provided with a mounting hole 175 that passes through the second insulating layer 174, and the reflective area 180 is located within the mounting hole 175. The second insulating layer 174 has a function of preventing the conductive structure (such as metal wire) of the substrate 140 from short-circuiting with other electrical components. The reflective area 180 is located within the mounting hole 175. During the process of forming the second insulating layer 174, an insulating film can be formed first, and then the insulating film can be etched to form the second insulating layer 174. The mounting hole 175 can be formed at the same time during the etching process to expose the reflective area 180, and no additional process can be performed. In addition, the reflective area 180 and the substrate 140 do not require an additional installation process, which reduces the installation cost and the assembly cost. In an embodiment where the material of the second base plate 142 includes copper, the excellent glossiness of copper can also reflect laser light, which is beneficial for assisting in determining the distance h between the lens assembly 112 and the surface of the substrate 140 .

[0097] In other embodiments of the present application, the reflective region 180 may not be disposed within the mounting hole 175 of the second insulating layer 174. For example, a reflective layer may be disposed on the side of the second insulating layer 174 facing away from the second base plate 142, with the reflective region 180 located on the surface of the reflective layer. The reflective layer may be, for example, a silver film or a copper film.

[0098] The embodiment of the present application does not limit the material of the second insulating layer 174 . Exemplarily, the material of the second insulating layer 174 includes liquid photoresist (also known as green oil).

[0099] As described above, in the embodiment where the substrate 140 includes the first bottom plate 141, the first bottom plate 141 and the second bottom plate 142 can be connected as an integral molded part. In the embodiment where the substrate 140 includes the second insulating layer 174 and the first insulating layer 171, the first insulating layer 171 and the second insulating layer 174 can be connected as an integral molded part.

[0100] As described above, in embodiments where the light source module 100 includes a bracket 150, the vertical projection of the bracket 150 on the substrate 140 does not completely overlap with the reflective area 180. This allows laser light incident on the reflective area 180 to avoid the bracket 150, preventing the bracket 150 from blocking the laser light. For example, the substrate 140 may include three reflective areas 180, each located within the first light-transmitting hole 151, the second light-transmitting hole 152, and the third light-transmitting hole 153.

[0101] FIG7 is a schematic structural diagram of another image generating device 11 provided in an embodiment of the present application. Referring to FIG7 , the light source module 100 further includes an assembly plate 144. The substrate 140 and the assembly plate 144 are perpendicular to each other. The first light source 110, the second light source 120, and the third light source 130 are all connected to the substrate 140, and the light emitting direction of the first light source 110 is away from the assembly plate 144. In this way, when the light source module 100 is connected to a structure such as a housing, it can be connected to the structure such as the housing through the assembly plate 144. The heat of the first light source 110, the second light source 120, and the third light source 130 is transferred to the assembly plate 144 through the substrate 140, and then transferred to the structure such as the housing. In some embodiments, an additional heat sink may not be provided on the side of the substrate 140 away from the first light source 110. In an embodiment where the material of the substrate 140 includes copper, the excellent thermal conductivity of copper can increase the heat dissipation. In addition, transferring the heat to the side away from the light emitting direction of the first light source 110 can avoid the heat from affecting components on the light emitting side of the first light source 110 (such as the light homogenizing element 13 in FIG. 2 ).

[0102] In some embodiments of the present application, the substrate 140 and the mounting plate 144 are connected to form an integrally formed part, so that the heat of the substrate 140 can be better transferred to the mounting plate 144 .

[0103] When the image generating device 11 is connected to the housing of the display device 10 , the assembly direction of the image generating device 11 and the housing is parallel to the substrate 140 . Alternatively, the assembly direction of the image generating device 11 and the housing is perpendicular to the substrate 140 .

[0104] In addition, the image generating device 11 also includes a light processing structure, such as a light homogenizing element 13 (as shown in FIG2 ). The light processing structure is located on the light-emitting side of the light source module 100. In some embodiments, the light processing structure is relatively large in the light-emitting direction of the light source module 100. For example, in FIG7 , k1 is larger than k2, and k1 is larger than k3. When installing the image generating device 11, in order to prevent the image generating device 11 from forming a cantilever structure with a long arm length, the larger end of the image generating device 11 is mounted to the other structures.

[0105] For example, when connecting the image generating device 11 to the housing of the display device 10, the end of the image generating device 11 with a size of k1×k2 is connected to the housing of the display device 10. The distance from the free end of the image generating device 11 to the housing is made smaller than k3. As described above, the substrate 140 and the mounting plate 144 are perpendicular to each other. The light emitting direction of the first light source 110 faces away from the mounting plate 144. When connecting the image generating device 11 to the housing of the display device 10, the mounting plate 144 is connected to the housing. The heat of the light source module 100 is conducted to the housing through the mounting plate 144, which provides the light source module 100 with excellent heat dissipation performance while improving the connection performance at the connection between the image generating device 11 and the housing.

[0106] In an embodiment of the present application, the substrate 140 may be a strip-shaped plate. In an embodiment in which the substrate 140 is a square plate, the side of the substrate 140 facing away from the first light source 110 is connected to the housing of the display device 10 to transfer heat from the first light source 110 to the housing of the display device 10.

[0107] FIG8 is a schematic structural diagram of another image generating device 11 provided in an embodiment of the present application. Referring to FIG8 , the substrate 140 is a square plate, and the substrate 140 is arranged on the larger end face of the image generating device 11. For example, the substrate 140 is arranged on the end face of the image generating device 11 with a size of k4×k5. k4 is greater than k5, and k4 is greater than k6. When the image generating device 11 is connected to the housing of the display device 10, the side of the substrate 140 away from the first light source 110 is connected to the housing of the display device 10. The substrate 140 transfers the heat of the first light source 110 to the housing of the display device 10, and no additional heat transfer structure is required, thereby reducing the volume of the image generating device 11. In addition, the distance from the free end of the image generating device 11 to the housing is as small as k6, which prevents the image generating device 11 from forming a cantilever structure with a long arm length, thereby increasing the stability of the image generating device 11.

[0108] It can be understood that the light emitting direction of the first light source 110 in Figure 7 is different from the light emitting direction of the first light source 110 in Figure 8. The installation position of the light beam processing structure in Figure 7 (such as the light homogenizing element 13 in Figure 2, etc.) and the installation position of the light beam processing structure in Figure 8 (such as the light homogenizing element 13 in Figure 2, etc.) can be set according to the optical path design. The optical path directions of the two may be different, and the embodiments of the present application do not impose any restrictions on this.

[0109] The above is only a specific embodiment of the present application, but the scope of protection of this application is not limited to this. Any changes or substitutions within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A light source module, characterized in that: The light source module comprises: substrate; The first light source; a second light source; and A third light source: the first light source, the second light source and the third light source are arranged side by side along a first direction and are all connected to the same side of the substrate; and light emitting directions of the first light source, the second light source and the third light source are parallel.

2. The light source module according to claim 1, characterized in that: The luminous efficiencies of the first light source, the second light source, and the third light source decrease successively.

3. The light source module according to claim 1 or 2, characterized in that: The light source module also includes: a controller; the first light source, the second light source and the third light source are all connected to the controller signal; the controller is used to control the electrical signals input to the first light source, the second light source and the third light source to decrease one by one.

4. The light source module according to any one of claims 1 to 3, characterized in that: The light source module also includes: a first identification portion and a second identification portion; the first identification portion and the second identification portion are arranged at intervals on the substrate; the vertical projection of the first identification portion on the surface of the substrate does not overlap with the first light source, the second light source, and the third light source; the vertical projection of the second identification portion on the surface of the substrate does not overlap with the first light source, the second light source, and the third light source.

5. The light source module according to claim 4, characterized in that: The substrate includes a first bottom plate and a first insulating layer which are stacked, the first insulating layer faces the first light source, the first light source, the second light source and the third light source all penetrate the first insulating layer and are connected to the first bottom plate; the first identification portion includes a first through hole, and the second identification portion includes a second through hole; the first through hole and the second through hole are arranged in the first insulating layer.

6. The light source module according to any one of claims 1 to 5, characterized in that: The first light source includes a light emitting device and a lens assembly; the light emitting device is connected to the substrate, and the lens assembly is located at the light emitting side of the light emitting device.

7. The light source module according to claim 6, characterized in that: The substrate is provided with a reflective area, which is located on the side of the substrate facing the lens assembly; the vertical projection of the light-emitting device on the surface of the substrate does not overlap with the reflective area, and the vertical projection of the lens assembly on the surface of the substrate at least partially overlaps with the reflective area.

8. The light source module according to claim 7, characterized in that: The substrate includes a second base plate and a second insulating layer which are stacked together, one end of the light-emitting device away from the lens assembly passes through the second insulating layer and is connected to the second base plate, and the second insulating layer is located between the lens assembly and the second base plate; the second insulating layer is provided with a mounting hole which passes through the second insulating layer, and the reflective area is located in the mounting hole.

9. The light source module according to any one of claims 1 to 8, characterized in that: The light source module also includes: a bracket; the bracket is connected to the side of the substrate facing the first light source, and the bracket is provided with a first light-transmitting hole, a second light-transmitting hole and a third light-transmitting hole; the first light source is located in the first light-transmitting hole, the second light source is located in the second light-transmitting hole, and the third light source is located in the third light-transmitting hole.

10. The light source module according to any one of claims 1 to 9, characterized in that: The light source module further includes: a mounting plate, the substrate and the mounting plate are perpendicular to each other, and the light emitting direction of the first light source is away from the mounting plate.

11. The light source module according to claim 10, characterized in that: The base plate and the assembly plate are connected to form an integrally formed part.

12. The light source module according to any one of claims 1 to 11, characterized in that: The first light source includes a green light emitting element; the second light source includes a blue light emitting element; the third light sources each include a red light emitting element; the green light emitting element, the blue light emitting element and the red light emitting element are all connected to the same side of the substrate.

13. An image generating device, characterized in that: The image generating device comprises: a light homogenizing element and a light source module as described in any one of claims 1 to 12, wherein the light homogenizing element is used to homogenize the light emitted by the first light source, the second light source and the third light source; wherein the optical path of the light emitted by the first light source, the second light source and the third light source to the light homogenizing element increases gradually.

14. The image generating device according to claim 13, characterized in that: The image generating device further comprises: a first reflecting element, a second reflecting element and a third reflecting element arranged side by side along the first direction; The first reflecting element is used to reflect the light emitted by the first light source and then transmit it through the second reflecting element and the The third reflecting element is projected onto the light homogenizing element; the second reflecting element is used to reflect the light emitted by the second light source and then project it onto the light homogenizing element through the third reflecting element; the third reflecting element is used to reflect the light emitted by the third light source onto the light homogenizing element.

15. A display device, characterized in that: The display device comprises: a processor and the image generating device according to claim 13 or 14; the processor is used to send image data to the image generating device.

16. A means of transport, characterized in that: The vehicle comprises: a reflective element and the display device according to claim 15, wherein the display device is used to emit a light beam, and the reflective element is used to reflect the light beam emitted by the display device.

Images