Light emitting device and system, and vehicle

Abstract

A light emitting device, a light emitting system, and a vehicle. The light emitting device comprises a light emitting element and an optical module; the optical module and the light emitting element are stacked; the optical module comprises a light homogenizing element; the light homogenizing element comprises at least a diffusion layer and a polarization layer; the polarization layer and the diffusion layer are stacked.

Description

Light-emitting devices and systems, vehicles

[0001] Priority information

[0002] This application claims priority and benefits to patent application No. 2025104899433, filed with the China National Intellectual Property Administration on April 17, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of light-emitting device technology, and more specifically, to a light-emitting device, a light-emitting system, and a vehicle. Background Technology

[0004] Backlight systems typically use lenses to enhance brightness, usually polygonal or spherical lenses. Polygonal lenses are assembled from multiple parts, and due to manufacturing limitations, they often exhibit lens textures at the edges. Spherical lenses have different refractive indices at the center and edges. After refraction, light rays from the edges and center do not converge at a single focal point, but rather form focal points at different locations. This results in light spots and uneven brightness in the image, leading to lens textures. Therefore, lens textures are unavoidable in backlight systems, resulting in poor light output and a reduced user visual experience. Summary of the Invention

[0005] This application provides a light-emitting device, a light-emitting system, and a vehicle.

[0006] The light-emitting device according to the embodiments of this application includes a light-emitting element and an optical module, wherein the optical module and the light-emitting element are stacked, the optical module includes a light-diffusing element, the light-diffusing element includes at least a diffusion layer and a polarization layer, and the polarization layer and the diffusion layer are stacked.

[0007] In some embodiments, the light homogenizer is a multilayer reflective polarizing film.

[0008] In some embodiments, the side of the light-emitting element facing the optical module is coated with white pigment.

[0009] In some embodiments, the optical module further includes a lens located between the light-diffusing element and the light-emitting element.

[0010] In some embodiments, the lens is a spherical lens.

[0011] In some embodiments, the optical module further includes a diffuser located between the light-emitting element and the lens.

[0012] In some embodiments, the optical module further includes a light guide with a light guide cavity. The light guide includes a first end and a second end facing away from each other. The light-emitting element, the lens, and the diffuser are disposed at the first end, and the light-diffusing element is disposed at the second end.

[0013] In some embodiments, the light-emitting device further includes a cover mounted on the second end of the light guide and located on the side of the light homogenizer away from the light guide cavity. The cover includes at least a partially transparent area to allow light emitted from the light homogenizer to pass through.

[0014] In some embodiments, the light-emitting device further includes a heat sink located on the side of the light-emitting device opposite to the optical module.

[0015] The light-emitting system of this application includes a display screen and a light-emitting device as described in any of the above embodiments. The light emitted by the light-emitting device enters the display screen.

[0016] The vehicle according to this application includes a windshield, a light-emitting system as described in any of the above embodiments, and / or a light-emitting device as described in any of the above embodiments. The light-emitting system or the light-emitting device is mounted on the windshield.

[0017] The parameter determination method of this application is applied to a light-emitting device, which includes a light-emitting element and an optical module, wherein the optical module and the light-emitting element are stacked, the optical module includes a light-diffusing element, and the light-diffusing element includes at least a diffusion layer and a polarization layer, wherein the polarization layer and the diffusion layer are stacked, and the method includes: determining the target total luminous flux of the light-emitting element based on the required total luminous flux of the light-emitting device and the parameters of the light-diffusing element; and determining the target parameters of the light-emitting element based on the target total luminous flux of the light-emitting element.

[0018] In some embodiments, the optical module further includes a lens located between the light homogenizer and the light-emitting element; determining the target total luminous flux of the light-emitting element based on the required total luminous flux of the light-emitting device and the parameters of the light homogenizer includes: determining the target total luminous flux of the light-emitting element based on the required total luminous flux of the light-emitting device, the parameters of the light homogenizer, and the parameters of the lens.

[0019] In some embodiments, the optical module further includes a diffuser located between the light-emitting element and the lens. Determining the target total luminous flux of the light-emitting element based on the required total luminous flux of the light-emitting device, the parameters of the light-diffusing element, and the parameters of the lens includes: determining the target total luminous flux of the light-emitting element based on the required total luminous flux of the light-emitting device, the parameters of the light-diffusing element, the parameters of the diffuser, and the parameters of the lens.

[0020] In some embodiments, the parameters of the diffuser sheet include the transmittance of the diffuser sheet.

[0021] In some embodiments, the parameters of the lens include the lens's transmittance.

[0022] In some embodiments, the parameters of the light homogenizer include the transmittance of the light homogenizer and the gain of the light homogenizer.

[0023] In some embodiments, determining the target parameters of the light-emitting element based on the target total luminous flux of the light-emitting element includes: determining the target parameters of the light-emitting element based on the determined parameters of the light-emitting element and the target total luminous flux of the light-emitting element.

[0024] In some embodiments, the determined parameters of the light-emitting element include the rated current of the light-emitting element, the design current of the light-emitting element, and the rated luminous flux of the light-emitting unit; the target parameters include the number of light-emitting units of the light-emitting element.

[0025] In some embodiments, the parameter determination method further includes: determining the light power of the light-emitting device based on the light-emitting parameters of the light-emitting device; and adjusting the parameters of the light-emitting device when the light power is outside a preset power range.

[0026] In some embodiments, the light emission parameters include the number of light emission units of the light emission element, the electrical power of the light emission unit, the electro-optical conversion efficiency of the light emission element, and the optical path transmission loss of the light emission device.

[0027] In some embodiments, the light-emitting element further includes a lens located between the light-diffusing element and the light-emitting element. The method further includes: adjusting a first distance between the test lens and the test light-emitting element of the test sample according to a preset step size to construct first samples corresponding to different first distances, wherein the test samples have the same structure as the light-emitting device; obtaining the light emission effect corresponding to each first sample; and determining the distance between the lens and the light-emitting element based on the first distance corresponding to the first sample whose light emission effect meets a first preset requirement.

[0028] In some embodiments, the light emission effect includes light uniformity, intensity, and illuminance, and the first preset requirement includes optimal light uniformity, or light uniformity within a preset uniformity range, and maximum intensity and illuminance.

[0029] In some implementations, the intensity is positively correlated with the first distance, and the illuminance is positively correlated with the first distance.

[0030] In some embodiments, the parameter determination method further includes: adjusting the second distance between the test lens and the test homogenizer of the test sample according to a preset step size to construct second samples corresponding to different second distances; obtaining the light output effect corresponding to each second sample; and determining the distance between the lens and the homogenizer based on the second distance corresponding to the second sample whose light output effect meets the second preset requirement.

[0031] In some embodiments, the optical module further includes a diffuser located between the light-emitting element and the lens. The parameter determination method further includes: adjusting a third distance between the test lens and the test diffuser of the test sample according to a preset step size to construct third samples corresponding to different third distances; obtaining the light emission effect corresponding to each of the third samples; and determining the distance between the lens and the diffuser based on the third distance corresponding to the third sample whose light emission effect meets a third preset requirement.

[0032] In some embodiments, the optical module further includes a light guide with a light guide cavity. The light guide includes a first end and a second end facing away from each other. The light-emitting element, the lens, and the diffuser are disposed at the first end, and the light-uniforming element is disposed at the second end, with the light-uniforming element located between the upper adhesive shell and the diffuser. The parameter determination method further includes: adjusting the test length of the test light guide of the test sample in the direction from the first end to the second end according to a preset step size to construct a fourth sample corresponding to different test lengths; obtaining the light emission effect corresponding to each of the fourth samples; and determining the length of the light guide in the direction from the first end to the second end based on the test length of the fourth sample whose light emission effect meets the fourth preset requirement.

[0033] The electronic device according to the embodiments of this application includes a processor, a memory, and a computer program, wherein the computer program is stored in the memory and executed by the processor, and the computer program includes instructions for performing the parameter determination method described in any of the above embodiments.

[0034] The non-volatile computer-readable storage medium of the present application includes a computer program that, when executed by a processor, causes the processor to perform the parameter determination method described in any of the above embodiments.

[0035] The light-emitting device, light-emitting system, and vehicle according to embodiments of this application include a light-emitting element and an optical module. The optical module includes a light-diffusing element, which comprises at least a diffusion layer and a polarizing layer, stacked together. When light emitted from the light-emitting element passes through the optical module, it is scattered at least by the diffusion layer, resulting in high uniformity of light emitted from the optical module and even the light-emitting device, avoiding light spots and uneven brightness. The polarizing layer reduces stray light and light with non-specific polarization directions, thereby improving the light emission effect of the light-emitting device. Thus, the diffusion layer and polarizing layer prevent lens marks from appearing in the light-emitting device, thereby improving the light emission effect and enhancing the user's visual experience.

[0036] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0037] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0038] Figure 1 is a schematic diagram of the lens pattern of a prior art light-emitting device;

[0039] Figure 2 is a schematic diagram of the light-emitting system in some embodiments of this application;

[0040] Figure 3 is a schematic diagram of the structure of a light-emitting device according to certain embodiments of this application;

[0041] Figure 4 is a schematic diagram of the optical path of a light-emitting device according to certain embodiments of this application;

[0042] Figure 5 is a schematic diagram of a scene of a light-emitting device according to certain embodiments of this application;

[0043] Figure 6 is a schematic diagram of a scene of a light-emitting device according to certain embodiments of this application;

[0044] Figure 7 is a structural schematic diagram of a vehicle according to certain embodiments of this application;

[0045] Figure 8 is a flowchart illustrating the parameter determination method of some embodiments of this application;

[0046] Figure 9 is a flowchart illustrating the parameter determination method of some embodiments of this application;

[0047] Figure 10 is a flowchart illustrating the parameter determination method of some embodiments of this application;

[0048] Figure 11 is a schematic diagram of the light emission effect of the light-emitting device according to certain embodiments of this application;

[0049] Figure 12 is a schematic diagram of the light emission effect of the light-emitting system in some embodiments of this application;

[0050] Figure 13 is an illuminance analysis diagram and an intensity analysis diagram of a light-emitting device according to certain embodiments of this application, as well as an illuminance analysis diagram and an intensity analysis diagram of a light-emitting system.

[0051] Figure 14 is a flowchart illustrating the parameter determination method of some embodiments of this application;

[0052] Figure 15 is a flowchart illustrating the parameter determination method of some embodiments of this application;

[0053] Figure 16 is a flowchart illustrating the parameter determination method of some embodiments of this application;

[0054] Figure 17 is a schematic diagram of the structure of an electronic device according to some embodiments of this application;

[0055] Figure 18 is a schematic diagram of the connection state between a non-volatile computer-readable storage medium and a processor according to certain embodiments of this application.

[0056] Key component symbols: 1000, Vehicle; 100, Light-emitting system; 10, Display screen; 20, Light-emitting device; 21, Light-emitting component; 22, Optical module; 221, Light-diffusing component; 222, Lens; 223, Diffuser; 224, Light guide; 23, Cover; 24, Heat sink; 200, Windshield; 300, Electronic equipment; 310, Processor; 320, Memory; 400, Non-volatile computer-readable storage medium; 410, Computer program; 420, Processor. Detailed Implementation

[0057] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of this application, and should not be construed as limiting the embodiments of this application.

[0058] A head-up display (HUD) is a device that projects information into the driver's field of vision, allowing the driver to obtain necessary information while keeping their eyes forward. Augmented Reality-Head-Up Display (AR HUD) technology originated from the traditional windshield-type head-up display (WHUD). The core difference between the two lies in the way information is presented and depth perception. WHUDs simply project information onto the windshield in front of the driver, with the displayed content often fixed on a single plane, a virtual image distance of less than 5 meters, and relatively simple content. AR HUDs, on the other hand, can use digital image processing technology to precisely overlay virtual information onto the driver's actual field of vision, with a virtual image distance of up to 10 meters, and can dynamically adjust the position and depth of the displayed content. This enhanced depth perception allows AR HUDs to provide a more intuitive and safer driving experience, such as overlaying navigation markers directly onto the road surface during navigation.

[0059] However, to achieve this visual effect, AR HUDs need to continuously display dynamic video images. This places higher demands on display technology, especially in terms of the backlight system. First, light is emitted from an active-matrix liquid crystal display (Thin Film Transistor, TFT) and ultimately reflected by the windshield before reaching the human eye to form an image. TFT screens have a transmittance of only about 6%, and the windshield's reflectivity is only about 25%, resulting in significant light loss during transmission. Furthermore, head-up display (HUD) systems are used in outdoor environments with strong sunlight, which reduces the visibility of the displayed content. The HUD needs high brightness to counteract the reflection of ambient light, making the displayed content stand out, reducing ambient light interference, and ensuring image quality and readability. The HUD requires a backlight unit (BLU) to provide a high-brightness light source. Second, HUDs suffer from sunlight backflow. Under strong outdoor sunlight, sunlight backflow can cause the internal temperature of the AR HUD to rise, and the high power consumption of the backlight further exacerbates heat accumulation. Excessive temperature can damage optical components and electronic parts, reducing the device's reliability and lifespan. Reducing backlight power consumption can decrease heat generation and alleviate temperature rise issues. Therefore, high-brightness, low-power backlights are required.

[0060] Lenses in a backlight system improve optical transmission efficiency and increase brightness. Lenses are typically polygonal or spherical. However, polygonal lenses are pieced together, and manufacturing limitations result in lens fringes at the edges. Spherical lenses have different refractive indices at the center and edges; after refraction, light rays from the edges and center do not converge at a single focal point, but rather at different locations, leading to light spots and uneven brightness in the image, thus causing lens fringes. The lens fringes phenomenon can be understood as uneven light emission from the backlight system. Furthermore, in direct-lit backlight systems, stray light is generated due to the distribution of LEDs and optical design, forming shadows on the display screen; these shadows can also be considered lens fringes. Therefore, lens fringes are unavoidable in backlight systems, and they degrade the user's visual experience. For example, Figures 1(a) and 1(b) show HUD images with lens fringes; both images show bright and dark areas, indicating uneven brightness.

[0061] To address the above problems, this application provides a light-emitting device 20, a light-emitting system 100, and a vehicle 1000. The light-emitting device 20, the light-emitting system 100, and the vehicle 1000 of this application will be described in detail below:

[0062] Please refer to Figure 2. The light-emitting system 100 of this application embodiment includes a display screen 10 and a light-emitting device 20. The light emitted by the light-emitting device 20 enters the display screen 10.

[0063] Specifically, the light-emitting system 100 can be understood as the aforementioned head-up display, which utilizes the principle of optical reflection to project key driving information (such as speed, navigation, etc.) onto the windshield in front of the driver or above the tip of the hood. The display screen 10 is an electronic device or component used to display images, text, or video. The light-emitting device 20, which can be understood as the aforementioned backlight system, is a device capable of emitting light. After the light emitted by the light-emitting device 20 enters the display screen 10, the display screen 10 can use that light to display images.

[0064] The installation position of the display screen 10 can be determined according to the light path of the light emitted from the light-emitting device 20, so as to ensure that the light emitted from the light-emitting device 20 can enter the display screen 10 and the display screen 10 can display patterns. For example, the display screen 10 can be directly connected to the cover 23 of the light-emitting device 20, and the display screen 10 covers all the transparent areas of the cover 23, so that all the light emitted from the cover 23 of the light-emitting device 20 can enter the display screen 10.

[0065] In some embodiments, referring to FIG3, the light-emitting device 20 includes a light-emitting element 21 and an optical module 22. The optical module 22 and the light-emitting element 21 are stacked. The optical module 22 includes a light-diffusing element 221, which includes at least a diffusion layer and a polarizing layer. The polarizing layer and the diffusion layer are stacked.

[0066] Specifically, the light-emitting element 21 refers to an object or component capable of autonomously emitting light, which can be generated by various physical, chemical, or biological processes. For example, the light-emitting element 21 is an LED light panel, which emits light by exciting electron transitions in semiconductor materials through electric current, and the LED light panel is composed of multiple high-power LEDs arranged in an array.

[0067] The optical module 22 is a component capable of transmitting light emitted by the light-emitting element 21, and the light emission effect of the light emitted by the light-emitting element 21 can be changed by setting the structure of the optical module 22. The optical module 22 includes a light-diffusing element 221, wherein the light-diffusing element 221 includes at least a diffusion layer, the main function of which is to scatter light. When light enters the light-diffusing element 221, the light is scattered by the diffusion layer, making the light distribution more uniform.

[0068] The light-emitting element 21 and the optical module 22 are stacked, with the light-emitting surface of the light-emitting element 21 facing the optical module 22, so that the light emitted by the light-emitting element 21 can enter the optical module 22. At the same time, the optical module 22 includes a light-diffusing element 221, and the light-diffusing element 221 is provided with at least a diffusion layer and a polarization layer.

[0069] The diffusion layer scatters light, improving the uniformity of light passing through it and ensuring the uniformity of light emitted from the light-emitting device 20. This reduces the occurrence of lens framing and improves the light emission effect of the light-emitting device 20. The opposite ends of the optical module 22 correspond to the light-emitting element 21 and the display screen 10, respectively. Therefore, light emitted from the optical module 22 can enter the display screen 10. Due to the high uniformity of the light emitted from the optical module 22, the brightness uniformity of various areas of the display screen 10 is also high, thereby improving the light emission effect of the light-emitting system 100.

[0070] The light emission effect can be understood as the visual effect of the light emitted by the light-emitting device 20. For example, the light emission effect includes light uniformity, intensity, and illuminance. Illuminance refers to the degree to which an object is illuminated, expressed as the luminous flux received per unit area. Brightness refers to the physical quantity of the intensity of light emission (or reflection) from the surface of a light-emitting (or reflective) body. Light uniformity refers to the evenness of the light distribution within the illuminated area or the area illuminated by the light. The better the light emission effect, the less likely lens marks will appear.

[0071] The light homogenizer 221 also includes a polarizing layer, which is stacked with a diffusion layer. A polarizing film is a device used to polarize light, based on the polarization phenomenon of light and the absorption and transmission characteristics of materials. The polarization of light refers to the orientation of the electric field vector in space. In natural light, the electric field vector can vibrate in any direction, while in polarized light, the electric field vector vibrates only in one direction, possessing a specific direction and amplitude. The polarizing film has a special internal structure, typically composed of multiple thin films or microstructures, which selectively absorb or transmit light polarized in a specific direction. During light propagation, only light with a specific polarization direction that matches the polarizing film structure can be transmitted; light with other polarization directions is selectively absorbed or reflected. This characteristic enables polarizing films to convert unpolarized light into polarized light, thus finding wide applications in optical technology and display fields.

[0072] Therefore, the light homogenizer 221 may also include a polarization layer, and the polarization layer and the diffusion layer are stacked so that the light emitted from the light-emitting element 21 can pass through the polarization layer and the diffusion layer. It should be noted that the positional relationship between the polarization layer, the diffusion layer and the light-emitting element 21 is not limited. The diffusion layer may be closer to the light-emitting element 21 than the polarization layer, or the polarization layer may be closer to the light-emitting element 21 than the diffusion layer.

[0073] The polarization layer reduces stray light and light rays with non-specific polarization directions. Simultaneously, it reflects light rays with one polarization direction, causing them to be reflected back into the optical module 22 or back into the light-emitting element 21. After passing through the optical module 22 again, the polarization direction of this reflected light may change, even becoming the specific polarization direction of the polarization layer. Thus, the polarization layer can reflect light rays that cannot pass through, and the reflected light rays have a certain probability of being converted into light rays that can pass through the polarization layer and exit from it, thereby improving the utilization rate of the light emitted by the light-emitting element 21.

[0074] Meanwhile, a polarizer (POL) is provided on the side of the display screen 10 opposite to the light-emitting device 20. The polarizer only allows light from a specific direction to pass through, while blocking light from other directions. The polarizer ensures that light passes through the liquid crystal layer of the display screen 10 in the correct direction, thereby forming a clear and bright image. The specific direction allowed by the polarizer of the display screen 10 is the same as the specific polarization direction of the polarization layer, ensuring that the light emitted from the light-emitting device 20 can enter the display screen 10, thereby ensuring that the display screen 10 can display the image normally. Therefore, the polarization layer of the light homogenizer 221 can reflect back the light that the display screen 10 cannot absorb in advance. If this unabsorbed light hits the display screen 10, it will generate heat, so the polarization layer also has a heat insulation effect, thereby ensuring that the display screen 10 does not overheat.

[0075] The light-emitting device 20 of this embodiment includes a light-emitting element 21 and an optical module 22. The optical module 22 includes a light-diffusing element 221, which includes at least a diffusion layer and a polarizing layer. When the light emitted by the light-emitting element 21 passes through the optical module 22, it is scattered at least by the diffusion layer, resulting in high uniformity of the light emitted from the optical module 22 and the light-emitting device 20, thus avoiding light spots and uneven brightness. The polarizing layer reduces stray light and light with non-specific polarization directions, thereby improving the light emission effect of the light-emitting device 20. Thus, the diffusion layer and polarizing layer prevent lens marks from appearing in the light-emitting device 20, thereby improving the light emission effect and enhancing the user's visual experience.

[0076] Referring to Figure 3, in some embodiments, the light homogenizer 221 is a multilayer reflective polarizing film (DBEF). The light homogenizer 221 contains a polarizing layer and a diffusion layer, and the diffusion layer has approximately 80% haze, resulting in a high light homogenization effect. Thus, a single light homogenizer 221 can simultaneously achieve the functions of both a polarizing layer and a diffusion layer, reducing the need for excessive film material in the light-emitting device 20, thereby reducing the size of the light-emitting device 20 and facilitating its subsequent installation.

[0077] Referring to Figure 3, in some embodiments, the side of the light-emitting element 21 facing the optical module 22 is coated with white pigment. This can be considered as whitening the side of the light-emitting element 21 facing the optical module 22 to increase the reflectivity of the light-emitting element 21 facing the optical module 22, for example, increasing the reflectivity of the optical module 22 to 80%. In this way, the light-emitting element 21 can effectively reflect the light reflected back from the polarization layer, reflecting this part of the light back into the optical module 22, thereby improving the light utilization rate.

[0078] Referring to Figure 3, in some embodiments, the optical module 22 further includes a lens 222, which is located between the light homogenizer 221 and the light-emitting element 21.

[0079] Specifically, the optical module 22 may include a lens 222, which is located between the light homogenizer 221 and the light-emitting element 21. The lens 222 is an optical element made of a transparent material (such as glass, crystal, etc.). The lens 222 allows light to pass through, and the light path is changed by two refractions when entering and leaving the lens 222. The lens 222 includes a collimating lens 222, which, through its special optical design, can achieve collimation of light, that is, allow light to propagate in a parallel manner. This type of lens 222 has important applications in various optical instruments because it can change the direction of light propagation, enabling light to propagate in a predetermined manner.

[0080] Therefore, the light emitted from the light-emitting element 21 can first pass through the lens 222. The lens 222 can reduce the divergence angle and make the light more parallel, which helps to improve the light transmission efficiency and reduce energy loss. At the same time, the lens 222 can also focus the light to a certain extent, so that the light can more concentratedly illuminate the subsequent optical elements (such as the light homogenizer 221). The light emitted from the lens 222 can enter the light homogenizer 221 to improve the uniformity of the light.

[0081] Thus, the optical module 22 can also be equipped with a lens 222 to improve the brightness of the light emitted by the light-emitting module and reduce energy loss, thereby helping to meet the high brightness and low energy consumption requirements of HUD.

[0082] Referring to Figure 3, in some embodiments, lens 222 is a spherical lens 222. A spherical lens 222 is also known as a glass bead. It is a solid or hollow glass bead with a diameter ranging from a few micrometers to tens of micrometers. Since the display screen 10 is relatively large, lens 222 can be composed of multiple spherical lenses 222. The spherical lens 222 can achieve collimation and focusing of light, thereby improving the brightness of the light-emitting device 20. Furthermore, the spherical lens 222 is integrally molded, not spliced ​​together, and has no process limitations, making it easy to manufacture.

[0083] Referring to Figure 3, in some embodiments, the optical module 22 further includes a diffuser 223 (DIF) located between the light-emitting element 21 and the lens 222.

[0084] Specifically, the diffuser 223 typically consists of an antistatic coating layer, a polyethylene terephthalate (PET) substrate, and a diffusion layer. The working principle of the diffuser 223 is to atomize the light source through refraction and reflection, and to concentrate the light from a small angle onto the front to improve the brightness of the front.

[0085] The light emitted by the light-emitting element 21 first passes through the diffuser 223 and is scattered by the tiny particles in the diffuser 223, making the light more evenly distributed throughout. Then the light emitted from the diffuser 223 can enter the light-diffusing element 221, thereby further reducing the graininess of the light after passing through the light-diffusing element 221, as well as the appearance of bright spots and dark areas after passing through the lens 222.

[0086] Please refer to Figures 2 and 10. In some embodiments, the optical module 22 further includes a light guide 224. The light guide 224 has a light guide cavity and includes a first end and a second end facing away from each other. The light-emitting element 21, the lens 222 and the diffuser 223 are disposed at the first end, and the light-diffusing element 221 is disposed at the second end.

[0087] Specifically, the light guide 224 has a light guide cavity inside, through which light can be transmitted. This ensures that light can pass through the light guide cavity and reach the desired location, while preventing some light from leaking to other places during transmission. Other components of the optical module 22 can be installed inside the light guide 224 to protect them. In one embodiment, the light guide 224 is a plastic frame.

[0088] The light-emitting element 21, lens 222, and diffuser 223 are located at the first end, and the light-diffusing element 221 is located at the second end. Therefore, there will be a distance between the diffuser 223 and the light-diffusing element 221. Among the light rays emitted from the diffuser 223, some light rays can directly enter the light-diffusing element 221. For example, light rays emitted vertically can directly enter the light-diffusing element 221. Other light rays, such as light rays with a larger emission angle, are repeatedly reflected in the light guide cavity corresponding to this distance until they enter the light-diffusing element 221.

[0089] The light path of the light-emitting device 20 is as follows: the light emitted by the light-emitting element 21 first passes through the lens 222. The light passing through the lens 222 becomes more parallel and concentrated, thus improving brightness. The light emitted from the lens 222 enters the diffuser 223, which makes the light distribution more uniform and reduces the appearance of bright and dark areas. Of the light emitted from the diffuser 223, some light can directly enter the light homogenizer 221, while the other part of the light is reflected in the light guide cavity corresponding to this distance until it enters the light homogenizer 221. The light homogenizer 221 can improve the uniformity of the incident light, and the light homogenizer 221 can only allow light with a specific polarization angle to exit from the second end of the light guide 224. For example, Figure 4 is a simulation diagram of the light emission of the light-emitting device 20. The second end of the light guide 224 corresponds to the display screen 10. After the light exits from the second end of the light guide 224 and enters the display screen 10, the display screen 10 can display an image.

[0090] It is understandable that the light guide 224 can improve the utilization rate of light. Without the light guide 224, only vertically or almost vertically emitted light can enter the light homogenizer 221, while light emitted at other angles will leak directly to the outside. With the light guide 224, these light rays that cannot directly enter the light homogenizer 221 will be reflected multiple times within the light guide cavity. After multiple reflections, the incident angle of the light may increase, allowing subsequent light rays to enter the light homogenizer 221, thus improving the light utilization rate. At the same time, after multiple reflections, these light rays that cannot directly enter the light homogenizer 221 have multiple possible incident positions when entering the light homogenizer 221, potentially entering various positions within the light homogenizer 221, thus improving the uniformity of light.

[0091] In summary, the film material of this application adopts a diffuser 223 + light homogenizer 221 structure. The diffuser 223 is placed on the surface of the lens 222. After parallel light passes through the diffuser 223, it will become light rays propagating in various directions, making the light distribution more uniform and avoiding local over-brightness or under-brightness. The specific polarized light reflected by the light homogenizer 221 can effectively mask these non-specific polarization direction lamp shadows, making the light propagate more uniformly. The light homogenizer 221 has a diffusion layer, which can improve the brightness uniformity of the display panel, thereby indirectly playing the role of shielding lamp shadows. At the same time, this application also provides a light guide 224 for light guiding, thereby making the light emission effect of the light-emitting device 20 of this application better. For example, Figure 5 is a light emission effect diagram of the light-emitting device 20, and Figure 6 is an imaging effect diagram of the light-emitting system 100 when imaging a white image on the windshield 200. It can be seen that the light emission of the light-emitting device 20 is uniform and there is no lens pattern phenomenon. The light-emitting system 100 also has no obvious lens pattern when imaging.

[0092] Please refer to Figure 3. In some embodiments, the light-emitting device 20 further includes a cover 23, which is mounted on the second end of the light guide 224 and located on the side of the light homogenizer 221 away from the light guide cavity. The cover 23 includes at least a partially transparent area to allow light emitted from the light homogenizer 221 to pass through.

[0093] Specifically, the cover 23 is installed at the second end of the light guide 224 and is located on the side of the light homogenizer 221 away from the light guide cavity. That is, the cover 23 can block the side of the second end of the light guide 224 facing the outside, so as to press the various components located at the second end of the light guide 224 and protect the various components at the second end of the light guide 224. At the same time, the cover 23 has at least a partially transparent area so that the light emitted through the light homogenizer 221 can pass through the cover 23 and thus be emitted to the outside of the light-emitting device 20.

[0094] The end of the cover 23 facing away from the light guide 224 can be connected to the display screen 10, so that the light emitted from the light diffuser 221 can enter the display screen 10.

[0095] In this way, the cover 23 can be set to protect the various components inside the light guide 224, and the cover 23 can be connected to the display screen 10 to ensure that the display screen 10 can receive the light emitted from the light homogenizer 221 and prevent the display screen 10 from damaging the various components inside the light guide 224.

[0096] Please refer to Figure 3. In some embodiments, the light-emitting device 20 further includes a heat sink 24, which is located on the side of the light-emitting device 21 that is away from the optical module 22.

[0097] Specifically, the heat sink 24, such as heat sink fins, is a device that assists other components in heat dissipation. Taking heat sink fins as an example, the heat dissipation of heat sink fins mainly relies on the shape and arrangement of the fins to increase the heat dissipation area, thereby improving heat dissipation efficiency. Heat sink fins are usually made of metals with good thermal conductivity (such as aluminum or copper), and are shaped like a comb with multiple parallel tooth-like structures. When a heat source generates heat, the heat is first conducted to the heat sink fins that are in direct contact with the heat source, and then transferred to the surrounding air through natural convection or forced convection.

[0098] When the light-emitting element 21 emits light, it generates heat. Therefore, the heat sink 24 can be placed on the side of the light-emitting element 21 away from the optical module 22. This ensures that the light emitted by the light-emitting element 21 will not enter the heat sink 24, and also allows the heat sink 24 to dissipate heat from the light-emitting element 21, preventing it from overheating and ensuring the safety of the light-emitting element 21.

[0099] Please refer to Figures 2 and 7. The vehicle 1000 of this embodiment includes a windshield 200, a light-emitting system 100 as described in any of the above embodiments, and / or a light-emitting device 20 as described in any of the above embodiments. The light-emitting system 100 or the light-emitting device 20 is mounted on the windshield 200.

[0100] Specifically, the vehicle 1000 may include at least one of a light-emitting system 100 and a light-emitting device 20. The light-emitting system 100 is a backlight system. Both the light-emitting system 100 and the light-emitting device 20 can be installed on the windshield 200 so that the light-emitting system 100 or the light-emitting device 20 can directly display information on the windshield 200, thereby realizing the head-up display function and making it convenient for users to view information.

[0101] Meanwhile, since the light-emitting device 20 of the light-emitting system 100 is provided with at least a light-uniforming element 221, the uniformity of the light emitted by the light-emitting system 100 is high, which makes the imaging effect of the light-emitting system 100 on the windshield 200 better and prevents the appearance of lens marks, thereby improving the user experience.

[0102] The vehicle 1000 of this application embodiment includes at least one of a light-emitting system 100 and a light-emitting device 20, and a windshield 200. The light-emitting device 20 of the light-emitting system 100 is provided with a light-emitting element 21 and an optical module 22. The optical module 22 includes a light-diffusing element 221, and the light-diffusing element 221 includes at least a diffusion layer. When the light emitted by the light-emitting element 21 passes through the optical module 22, it will be scattered by at least the diffusion layer, so that the uniformity of the light emitted by the optical module 22 and even the light-emitting device 20 is high, avoiding the appearance of light spots and uneven brightness. This allows the light-emitting device 20 to avoid lens marks, thereby improving the imaging effect of the light-emitting system 100 on the windshield 200 and improving the user's visual experience.

[0103] Referring to Figures 3 and 8, this application also provides a parameter determination method applied to a light-emitting device 20. The light-emitting device 20 includes a light-emitting element 21 and an optical module 22, which are stacked together. The optical module 22 includes a light-diffusing element 221, which includes at least a diffusion layer and a polarizing layer, which are stacked together. The parameter determination method includes:

[0104] Step 011: Based on the required total luminous flux of the light-emitting device 20 and the parameters of the light-diffusing element 221, determine the target total luminous flux of the light-emitting element 21;

[0105] Step 012: Determine the target parameters of the light-emitting element 21 based on the target total luminous flux of the light-emitting element 21.

[0106] Specifically, the design of the lens texture must be based on the premise of meeting the brightness design requirements. The brightness design must consider maximizing the effective luminous flux after the light emitted from the light-emitting element 21 passes through the optical module 22. Luminous flux is a physical quantity that describes the intensity of the energy of the light emitted by a light source. It can also be understood as the total amount of light emitted by the light source per unit time. In other words, luminous flux represents the total amount of light emitted by the light source.

[0107] The total luminous flux required by the light-emitting device 20 can be obtained based on the user's brightness requirements. The light emitted by the light-emitting element 21 needs to pass through the light-diffusing element 221 before exiting the light-emitting device 20. However, only a portion of the light emitted by the light-emitting element 21 can pass through the light-diffusing element 221, thus affecting the final total luminous flux of the light-emitting device 20. Therefore, it is necessary to calculate the target total luminous flux required by the light-emitting element 21 based on the parameters of the light-diffusing element 221, such as its transmittance and the required total luminous flux.

[0108] In some embodiments, the optical module 22 further includes a lens 222 located between the homogenizer 221 and the light-emitting element 21. When the optical module 22 includes the lens 222, the light emitted from the light-emitting element 21 must also pass through the lens 222 to exit the optical device. Therefore, the lens 222 affects the final total luminous flux of the light-emitting device 20. Consequently, it is necessary to inversely calculate the target total luminous flux required from the light-emitting element 21 based on the required total luminous flux, the parameters of the homogenizer 221, and the parameters of the lens 222, such as the transmittance of the homogenizer 221 and the lens 222.

[0109] In some embodiments, the optical module 22 further includes a diffuser 223 located between the light-emitting element 21 and the lens 222. When the optical module 22 includes the diffuser 223, the light emitted from the light-emitting element 21 must also pass through the diffuser 223 to exit the optical device. Therefore, the diffuser 223 also affects the final total luminous flux of the light-emitting device 20. Thus, the target total luminous flux of the light-emitting element 21 can be determined based on the required total luminous flux of the light-emitting device 20, the parameters of the homogenizer 221, the parameters of the diffuser 223, and the parameters of the lens 222.

[0110] Specifically, the parameters of the diffuser 223 include its transmittance. The parameters of the lens 222 include its transmittance. The parameters of the homogenizer 221 include its transmittance and its gain. These parameters can all be tested after determining the specifications of the diffuser 223, lens 222, and homogenizer 221. For example, the transmittance of lens 222 is 95%, the transmittance of diffuser 223 is 93%, and the transmittance of homogenizer 221 is 48%.

[0111] The mathematical model for calculating the total luminous flux of the target by combining diffuser 223, homogenizer 221, and lens 222 is as follows:

[0112] L=A*B*C*D*E*F

[0113] L: Total luminous flux required

[0114] A: Total luminous flux of the light-emitting element 21

[0115] B: Transmittance of lens 222

[0116] C: Transmittance of diffuser 223

[0117] D: Transmittance of the light homogenizer 221

[0118] E: The gain of the homogenizer 221 has different coefficients for different light-emitting devices 20, depending on the reflectivity of the actual circuit board (PCB) and the direction of internal light path scattering and diffraction.

[0119] F: Effective light energy at viewing angle. The efficiency varies for different light-emitting systems 100 using light-emitting modules (e.g., head-up displays), depending on the size of the eye box and display screen 10 of the actual light-emitting system 100.

[0120] Next, the target parameters of the light-emitting element 21 can be determined based on the target total luminous flux of the light-emitting element 21. The target parameters of the light-emitting element 21 that affect the light output effect can be adjusted based on the target total luminous flux of the light-emitting element 21, thereby ensuring that the luminous flux of the light-emitting element 21 after emission is the target total luminous flux.

[0121] In one embodiment, the target parameters of the light-emitting element 21 can be determined based on its predetermined parameters and the target total luminous flux. Various parameters can affect the light emission effect of the light-emitting element 21. For example, the light-emitting element 21 may have multiple light-emitting units, each capable of emitting light when powered on; the light-emitting element 21 can be understood as an LED light panel, and the light-emitting units as LED beads. Parameters affecting the light emission effect of the light-emitting element 21 may include the luminous flux of a single light-emitting unit in the light-emitting element 21, or the number of light-emitting units in the light-emitting element 21. Among these parameters, some can be predetermined and have fixed values; these are called predetermined parameters, such as the rated current of the light-emitting element 21. The other set of parameters that need to be designed are the target parameters. Both the predetermined and target parameters affect the total luminous flux of the light-emitting element 21; therefore, the target parameters of the light-emitting element 21 can be determined based on its predetermined parameters and the target total luminous flux.

[0122] For example, the known parameters of the light-emitting element 21 include its rated current, design current, and rated luminous flux of the light-emitting unit; the target parameters include the number of light-emitting units in the light-emitting element 21. The corresponding mathematical model is as follows:

[0123] A = G * H * I / J

[0124] G: Rated luminous flux of a single light-emitting unit under rated current

[0125] H: Number of light-emitting units

[0126] I: Design current

[0127] J: Rated Current

[0128] The design current represents the current required by the power supply to flow through the bulb filament for the bulb to operate normally. The rated current is a key parameter in the design and manufacturing process of a light bulb; it indicates the current at which the bulb can operate stably under its rated voltage.

[0129] It is understood that the rated current, design current, and rated luminous flux of a single light-emitting unit of the light-emitting element 21 are all obtainable from the datasheet of the light-emitting element 21. Therefore, the target total luminous flux, the rated current of the light-emitting element 21, the design current of the light-emitting element 21, and the rated luminous flux of the light-emitting unit can be substituted into the mathematical model to obtain the number of light-emitting units required for the luminous flux of the light-emitting element 21 to meet the target total luminous flux. In this way, it can be ensured that the total luminous flux output by the light-emitting element 21 can reach the target total luminous flux.

[0130] The light-emitting system 100 of this application embodiment includes a light-emitting device 20 comprising a light-emitting element 21 and an optical module 22. The optical module 22 includes a light-diffusing element 221, which at least includes a diffusion layer. When the light emitted by the light-emitting element 21 passes through the optical module 22, it undergoes scattering at least through the diffusion layer, resulting in high uniformity of the light emitted from the optical module 22 and even the light-emitting device 20. This avoids light spots and uneven brightness, thus preventing lens marks in the light-emitting device 20 and improving the user's visual experience. Furthermore, the parameters of the light-emitting element 21 can be designed based on the required total luminous flux of the light-emitting device 20 and the parameters of the light-diffusing element 221 to ensure that the light emitted by the light-emitting device 20 ultimately meets its required total luminous flux, resulting in better light emission and satisfying the user's brightness requirements.

[0131] Please refer to Figures 3 and 9. In some embodiments, the parameter determination method further includes:

[0132] Step 013: Determine the light power of the light-emitting device 20 based on its light-emitting parameters;

[0133] Step 014: When the light power is outside the preset power range, adjust the parameters of the light-emitting device 20.

[0134] Specifically, the display screen 10 of the light-emitting system 100 operates at a relatively high temperature; for example, the operating temperature of a TFT screen is approximately 105°C, and the operating temperature of a POL screen is approximately 100°C. Excessive temperature can easily affect the display screen 10. Therefore, to ensure the normal operation of the display screen 10, it is also necessary to control the optical power of the light-emitting device 20. Optical power refers to the work done by light per unit time, which can also be understood as the power of light passing through a specific area per unit time.

[0135] A reasonable range of optical power can be preset in advance, assuming the display screen 10 does not overheat and the light emission effect of the light-emitting device 20 is good; this is known as the preset power range. Then, the optical power of the light-emitting device 20 is determined based on its emission parameters, which are parameters affecting the light emitted by the light-emitting device 20. These parameters include, for example, the number of light-emitting units in the light-emitting element 21, the electrical power of the light-emitting unit, the electro-optical conversion efficiency of the light-emitting element 21, and the optical path transmission loss of the light-emitting device 20. The mathematical model at this point is as follows:

[0136] K = L * M * N * P

[0137] K: Optical power of light-emitting device 20

[0138] L: Electrical power of the light-emitting unit

[0139] M: Number of light-emitting units

[0140] N: The electro-optical conversion efficiency of the light-emitting element 21, for example, 50%.

[0141] P: Optical path transmission loss, including light at angles outside the receiving surface of the TFF screen, and light loss in optical elements such as lens 222 and film materials (e.g., diffuser 223 and homogenizer 221) during optical path transmission.

[0142] When the optical power is outside the preset power range, it can be assumed that the optical power needs to be adjusted. Therefore, the parameters of at least one component of the light-emitting device 20 can be adjusted, namely, the parameters of the light-emitting element 21, the lens 222, the light-diffusing element 221, the diffuser, or the light guide element 224, to change the optical power of the light-emitting device 20. For example, the number of light-emitting units of the light-emitting element 21 can be adjusted, or the parameters of the diffuser can be adjusted to adjust the optical path transmission loss, thereby adjusting the optical power of the light-emitting device 20.

[0143] If the light power is within the preset power range, it can be considered that the light power is within a reasonable range. After the light-emitting device 20 is put into use, the display screen 10 will not overheat, and the light emission effect of the light-emitting device 20 will also be better.

[0144] In this way, by controlling the light power, it can be ensured that the display screen 10 will not overheat after the light-emitting device 20 is put into use, and the light emission effect of the light-emitting device 20 will also be better.

[0145] In summary, based on the above parameter determination method, the design of the light-emitting element 21, lens 222, and film material that meet the luminous flux required for illumination can be obtained.

[0146] Referring to Figures 3 and 10, in some embodiments, the light-emitting element 21 further includes a lens 222, which is located between the light-diffusing element 221 and the light-emitting element 21. The parameter determination method further includes:

[0147] Step 015: Adjust the first distance between the test lens 222 and the test light-emitting element 21 of the test sample according to the preset step size to construct the first sample corresponding to different first distances. The test sample has the same structure as the light-emitting device 20.

[0148] Step 016: Obtain the light output effect corresponding to each first sample;

[0149] Step 017: Based on the first distance corresponding to the first sample whose light emission effect meets the first preset requirement, determine the distance between the lens 222 and the light-emitting element 21.

[0150] Specifically, the distance between lens 222 and light-emitting element 21 affects the angle of incidence of light entering lens 222, thus affecting the angle of exit. This distance also affects the angle of incidence of light emitted from lens 222 onto the film material, consequently affecting the angle of exit and thus the uniform light distribution effect of lens 222. The distance between light-emitting element 21 and lens 222 should match the focal length of lens 222 to ensure that light can be correctly focused or diverged. An improper distance may result in blurred, uneven, or insufficient light intensity. Therefore, the optimal distance between lens 222 and light-emitting element 21 can be determined through prior experimentation.

[0151] The light emission effect can be understood as the visual effect of the light emitted by the light-emitting device 20. For example, the light emission effect includes light uniformity, intensity, and illuminance. Illuminance refers to the degree to which an object is illuminated, expressed as the luminous flux received per unit area. Brightness refers to the physical quantity of the intensity of light emission (or reflection) from the surface of a light-emitting (or reflective) body. Light uniformity refers to the degree of uniformity of light distribution within the illuminated area or the area illuminated by the light. The better the light emission effect, the less likely lens fringes will appear. Therefore, the optimal distance between the lens 222 and the light-emitting element 21 can be determined based on the light emission effect.

[0152] First, a test sample with the same structure as the light-emitting device 20 can be constructed based on the light-emitting device 20. This test sample also includes a light-emitting element 21, a lens 222, and a light-diffusing element 221, and the parameters of these components are the same as those of the corresponding components in the light-emitting device 20. The light-emitting element 21 in the test sample is called the test light-emitting element 21, the lens 222 in the test sample is called the test lens 222, and the light-diffusing element 221 in the test sample is called the test light-diffusing element 221.

[0153] Then, the distance between the test lens 222 and the test light-emitting element 21 can be adjusted according to a preset step size. For example, the first distance between the test lens 222 and the test light-emitting element 21 can be changed in steps of 0.1 mm to construct first samples corresponding to different first distances. Then, the light emission effect corresponding to each first sample can be obtained, for example, by simulating each first sample using LightTools to obtain the light emission effect corresponding to each first sample. Then, based on the first sample whose light emission effect meets the first preset requirement, the target sample is selected, and the distance between the lens 222 and the light-emitting element 21 of the light-emitting device 20 is determined by the first distance between the test lens 222 and the test light-emitting element 21 corresponding to the target sample.

[0154] The higher the light uniformity, the less likely lens marks will appear. Therefore, in some embodiments, the first preset requirement includes optimal light uniformity, that is, the first distance corresponding to the first sample with optimal light uniformity is taken as the distance between the lens 222 and the light-emitting element 21.

[0155] In other embodiments, the first preset requirement includes that the light uniformity is within a preset uniformity range, and that the intensity and illuminance are maximized. Figure 11 shows the light emission effect of the light-emitting device 20 at different first distances, and Figure 12 shows the light emission effect of the light-emitting system 100 at different first distances. The first distances corresponding to the small figures with the same labels in the two figures are the same. As can be seen from Figures 11 and 12, when the distance is within a certain range, the difference in light uniformity is not significant.

[0156] Figure 13 shows the illuminance and intensity analysis of the light-emitting device 20 and the light-emitting system 100 at various first distances, where the horizontal axis z in Figure 13 represents the first distance. As shown in Figure 13, intensity is positively correlated with the distance between the lens 222 and the light-emitting element 21, and illuminance is also positively correlated with the distance between the lens 222 and the light-emitting element 21. Therefore, a preset uniformity range can be set according to the uniformity requirements. This preset uniformity range is the range of light uniformity when the light uniformity of the light-emitting device 20 is optimal. Among multiple first samples whose light uniformity is within the preset uniformity range, the first sample with the highest illuminance and intensity is selected as the target sample. Simultaneously, since both illuminance and intensity are positively correlated with the first distance, the actual distance is the first distance corresponding to the first sample with the highest first distance within the preset uniformity range, which is the distance between the lens 222 and the light-emitting element 21 of the light-emitting device 20. This ensures that the final light output effect of the light-emitting device 20 is optimal.

[0157] It should be noted that when determining the light emission effect corresponding to different first samples, a comprehensive evaluation can be made by combining the light emission effects of the light-emitting device 20 and the light-emitting system 100. When constructing test samples, samples are also constructed based on the light-emitting system 100, and the distances of each sample corresponding to the light-emitting system 100 are adjusted according to the first distance, then the light emission effect corresponding to each sample corresponding to the light-emitting system 100 is obtained. For example, the light emission effects of Figures a to g in Figure 11 are not significantly different. However, the light emission effects of Figures c and d in Figure 12 are the best. Therefore, by combining the light emission effects of the light-emitting device 20 and the light-emitting system 100, it can be determined that the first samples corresponding to Figures c and d have the best light emission effects.

[0158] It should be noted that the processes of constructing the first sample and obtaining the light emission effect described above can be simulated using simulation software, without the need to construct a real first sample (i.e., generate the light-emitting device 20 corresponding to different first distances), thus reducing testing costs. Of course, in other embodiments, a real first sample can also be constructed, which is not limited here.

[0159] In this way, by testing the light emission effect corresponding to different distances between the lens 222 and the light-emitting element 21 in advance, and then determining the distance between the lens 222 and the light-emitting element 21 based on the first distance corresponding to the first sample that meets the light emission effect requirements, the distance between the lens 222 and the light-emitting element 21 can be optimized, which is beneficial to the fusion of multiple light spots of the lens 222 to form a light source with high uniformity, so as to obtain the best optical effect.

[0160] Referring to Figures 3 and 14, in some embodiments, the light-emitting element 21 further includes a lens 222, which is located between the light-diffusing element 221 and the light-emitting element 21. The parameter determination method further includes:

[0161] Step 018: Adjust the second distance between the test lens 222 and the test light homogenizer 221 of the test sample according to the preset step size to construct the second sample corresponding to different second distances. The test sample has the same structure as the light-emitting device 20.

[0162] Step 019: Obtain the light output effect corresponding to each second sample;

[0163] Step 020: Determine the distance between lens 222 and light homogenizer 221 based on the second distance corresponding to the second sample whose light output effect meets the second preset requirements.

[0164] Specifically, the distance between lens 222 and light homogenizer 221 affects the incident position of light rays entering light homogenizer 221, thus affecting the light homogenizing effect of light homogenizer 221. Therefore, the optimal distance between lens 222 and light homogenizer 221 can be obtained through prior experiments.

[0165] The distance between the test lens 222 and the test light homogenizer 221 can be adjusted according to a preset step size. For example, the second distance between the test lens 222 and the test light homogenizer 221 can be changed in steps of 0.1 mm to construct second samples corresponding to different second distances. Then, the light emission effect corresponding to each second sample is obtained, for example, by simulating each second sample using LightTools to obtain the light emission effect corresponding to each second sample. Then, the second sample whose light emission effect meets the second preset requirement is taken as the target sample, and the second distance between the test lens 222 and the test light homogenizer 221 corresponding to the target sample is used to determine the distance between the lens 222 and the light homogenizer 221 of the light-emitting device 20. The second preset requirement can be optimal light uniformity, or light uniformity within a preset uniformity range, and maximum intensity and illuminance.

[0166] It should be noted that the construction of the second sample and the acquisition of the light emission effect described above can both be completed through simulation software, without the need to construct a real second sample (i.e., generate the light emission device 20 corresponding to different second distances), in order to reduce testing costs. Of course, in other embodiments, a real second sample can also be constructed, which is not limited here.

[0167] In this way, by testing the light output effect when the second distance between the lens 222 and the light homogenizer 221 is at different distances in advance, and then determining the distance between the lens 222 and the light homogenizer 221 based on the second distance corresponding to the second sample with the best light output effect, the distance between the lens 222 and the light homogenizer 221 can be optimized to obtain the best optical effect.

[0168] Referring to Figures 3 and 15, in some embodiments, the optical module 22 further includes a lens 222 and a diffuser 223. The lens 222 is located between the light homogenizer 221 and the light-emitting element 21, and the diffuser 223 is located between the light-emitting element 21 and the lens 222. The parameter determination method further includes:

[0169] Step 021: Adjust the third distance between the test lens 222 and the test diffuser 223 of the test sample according to the preset step size to construct a third sample corresponding to different third distances. The test sample has the same structure as the light-emitting device 20.

[0170] Step 022: Obtain the light output effect corresponding to each third sample;

[0171] Step 023: Determine the distance between lens 222 and light homogenizer 221 based on the third distance corresponding to the third sample whose light output effect meets the third preset requirement.

[0172] Specifically, when the optical module 22 also includes a diffuser 223, the test sample also includes a diffuser 223, and in this case, the diffuser 223 of the test sample is referred to as the test diffuser 223. The distance between the lens 222 and the diffuser 223 affects the incident position of light entering the diffuser 223, thereby affecting the light homogenization effect of the diffuser 223. Therefore, the optimal distance between the lens 222 and the diffuser 223 can be obtained through prior experiments.

[0173] The distance between the test lens 222 and the test diffuser 223 can be adjusted according to a preset step size. For example, the third distance between the test lens 222 and the test diffuser 223 can be changed in steps of 0.1 mm to construct third samples corresponding to different third distances. Then, the light emission effect corresponding to each third sample is obtained, for example, by simulating each third sample using LightTools to obtain the light emission effect corresponding to each third sample. Then, based on the third sample whose light emission effect meets the third preset requirement, the target sample is selected, and the distance between the lens 222 and the diffuser 223 of the light-emitting device 20 is determined by the third distance between the test lens 222 and the test diffuser 223 corresponding to the target sample. The third preset requirement can be optimal light uniformity, or light uniformity within a preset uniformity range, with maximum intensity and illuminance.

[0174] It should be noted that the construction of the third sample and the acquisition of the light emission effect described above can both be completed through simulation software, without the need to construct a real third sample (i.e., generate the light emission device 20 corresponding to different third distances), in order to reduce testing costs. Of course, in other embodiments, a real third sample can also be constructed, which is not limited here.

[0175] In this way, by testing the light emission effect when the third distance between lens 222 and diffuser 223 is at different distances in advance, and then determining the distance between lens 222 and diffuser 223 based on the third distance corresponding to the third sample with the best light emission effect, the distance between lens 222 and diffuser 223 can be optimized to obtain the best optical effect.

[0176] Please refer to Figures 3 and 16. In some embodiments, the optical module 22 further includes a lens 222, a diffuser 223, and a light guide 224. The lens 222 is located between the light homogenizer 221 and the light emitter 21. The diffuser 223 is located between the light emitter 21 and the lens 222. The light guide 224 has a light guide cavity and includes a first end and a second end facing away from each other. The light emitter 21, the lens 222, and the diffuser 223 are located at the first end, and the light homogenizer 221 is located at the second end. The light homogenizer 221 is located between the upper shell and the diffuser 223.

[0177] Parameter determination methods also include:

[0178] Step 024: Adjust the test length of the test light guide 224 of the test sample in the direction from the first end to the second end according to the preset step length, so as to construct the fourth sample corresponding to different test lengths. The test sample has the same structure as the light-emitting device 20.

[0179] Step 025: Obtain the light output effect corresponding to each fourth sample;

[0180] Step 026: Determine the length of the light guide 224 in the direction from the first end to the second end based on the test length corresponding to the fourth sample whose light output effect meets the fourth preset requirement.

[0181] Specifically, when the optical module 22 also includes a light guide 224, the test sample also includes a light guide 224, which is then referred to as the test light guide 224. If the length of the light guide 224 in the direction from the first end to the second end is too long, it will occupy too much space; if the length is too short, the light will not be sufficiently reflected within the light guide cavity, thus affecting the uniformity of the light. Therefore, the length of the light guide 224 in the direction from the first end to the second end can be determined through prior experimentation.

[0182] The length of the test light guide 224 in the direction from the first end to the second end can be adjusted according to a preset step size. For example, the length of the test light guide 224 in the direction from the first end to the second end can be changed in a step size of 0.1 mm to construct fourth samples corresponding to different test lengths. Then, the light emission effect corresponding to each fourth sample is obtained, for example, by simulating each fourth sample using LightTools to obtain the light emission effect corresponding to each fourth sample. Then, based on the fourth preset requirement of the light emission effect, the fourth sample is taken as the target sample, and the distance between the lens 222 and the diffuser 223 of the light-emitting device 20 is determined by the length of the test light guide 224 corresponding to the target sample in the direction from the first end to the second end. Among them, the fourth preset requirement can be the best light uniformity, or the light uniformity is within the preset uniformity range, and the intensity and illuminance are the maximum.

[0183] It should be noted that the construction of the fourth sample and the acquisition of the light emission effect described above can both be completed through simulation software, without the need to construct a real fourth sample, thus reducing testing costs. Of course, in other implementations, a real fourth sample can also be constructed, and this is not a limitation here.

[0184] In this way, by testing the light output effect of the light guide 224 in the direction from the first end to the second end in advance when the length of the light guide 224 in the direction from the first end to the second end is different, and then determining the length of the light guide 224 in the direction from the first end to the second end based on the test length corresponding to the fourth sample with the best light output effect, the length of the light guide 224 in the direction from the first end to the second end can be optimized to obtain the best optical effect.

[0185] Please refer to Figures 2 and 17. The electronic device 300 of this application includes a processor 310, a memory 320, and a computer program. The computer program is stored in the memory 320 and executed by the processor 310. The computer program includes instructions for performing the parameter determination method of any of the above embodiments.

[0186] Please refer to Figure 18. This application also provides a computer-readable storage medium 400, on which a computer program 410 is stored. When the computer program 410 is executed by the processor 420, it implements the steps of the parameter determination method of any of the above embodiments. For the sake of brevity, it will not be described again here.

[0187] In the description of this specification, the references to terms such as "some embodiments," "in one example," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0188] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0189] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A light-emitting device (20), wherein, include: Light-emitting component (21); An optical module (22) and a light-emitting element (21) are stacked together. The optical module (22) includes a light-diffusing element (221), which includes at least a diffusion layer and a polarization layer. The polarization layer and the diffusion layer are stacked together.

2. The light-emitting device (20) according to claim 1, wherein, The light-diffusing element (221) is a multilayer reflective polarizing film.

3. The light-emitting device (20) according to claim 1 or 2, wherein, The side of the light-emitting element (21) facing the optical module (22) is coated with white pigment.

4. The light-emitting device (20) according to claim 1 or 2, wherein, The optical module (22) further includes a lens (222), which is located between the light-diffusing element (221) and the light-emitting element (21).

5. The light-emitting device (20) according to claim 4, wherein, The lens (222) is a spherical lens (222).

6. The light-emitting device (20) according to claim 4, wherein, The optical module (22) also includes a diffuser (223) located between the light-emitting element (21) and the lens (222).

7. The light-emitting device (20) according to claim 6, wherein, The optical module (22) further includes a light guide (224), which has a light guide cavity. The light guide (224) includes a first end and a second end facing away from each other. The light-emitting element (21), the lens (222) and the diffuser (223) are located at the first end, and the light-diffusing element (221) is located at the second end.

8. The light-emitting device (20) according to claim 7, wherein, The light-emitting device (20) also includes a cover (23), which is installed at the second end of the light guide (224) and located on the side of the light homogenizer (221) away from the light guide cavity. The cover (23) includes at least a partially transparent area to allow light emitted from the light homogenizer (221) to pass through.

9. The light-emitting device (20) according to claim 1, wherein, The light-emitting device (20) also includes a heat sink (24), which is located on the side of the light-emitting device (21) away from the optical module (22).

10. A light-emitting system (100), wherein, include: Display screen (10) ； The light-emitting device (20) according to any one of claims 1-9, wherein the light emitted by the light-emitting device (20) is incident on the display screen (10).

11. A vehicle (1000), wherein, include: Windshield (200) ； The light-emitting system (100) of claim 10 and / or the light-emitting device (20) of any one of claims 1-9, wherein the light-emitting system (100) or the light-emitting device (20) is mounted on the windshield (200).

12. The parameter determination method according to claim 1, wherein, The method is applied to a light-emitting device (20), the light-emitting device (20) including a light-emitting element (21) and an optical module (22), the optical module (22) and the light-emitting element (21) being stacked, the optical module (22) including a light-diffusing element (221), the light-diffusing element (221) including at least a diffusion layer and a polarization layer, the polarization layer and the diffusion layer being stacked, the method including: Based on the total luminous flux required by the light-emitting device (20) and the parameters of the light-diffusing element (221), the target total luminous flux of the light-emitting element (21) is determined; The target parameters of the light-emitting element (21) are determined based on the target total luminous flux of the light-emitting element (21).

13. The parameter determination method according to claim 12, wherein, The optical module (22) further includes a lens (222), which is located between the light-diffusing element (221) and the light-emitting element (21); the method includes: The target total luminous flux of the light-emitting device (21) is determined based on the required total luminous flux of the light-emitting device (20), the parameters of the light-diffusing element (221), and the parameters of the lens (222).

14. The parameter determination method according to claim 12, wherein, The optical module (22) further includes a diffuser (223) and a lens (222), wherein the lens (222) is located between the light-diffusing element (221) and the light-emitting element (21), and the diffuser (223) is located between the light-emitting element (21) and the lens (222). The method includes: The target total luminous flux of the light-emitting device (21) is determined based on the required total luminous flux of the light-emitting device (20), the parameters of the light-diffusing element (221), the parameters of the diffuser (223), and the parameters of the lens (222).

15. The parameter determination method according to claim 14, wherein, The parameters of the diffuser (223) include the transmittance of the diffuser (223).

16. The parameter determination method according to any one of claims 13-14, wherein, The parameters of the lens (222) include the transmittance of the lens (222).

17. The parameter determination method according to any one of claims 12-14, wherein, The parameters of the light homogenizer (221) include the transmittance of the light homogenizer (221) and the gain of the light homogenizer (221).

18. The parameter determination method according to claim 12, wherein, The determination of the target parameters of the light-emitting element (21) based on the target total luminous flux of the light-emitting element (21) includes: Based on the determined parameters of the light-emitting element (21) and the target total luminous flux of the light-emitting element (21), the target parameters of the light-emitting element (21) are determined.

19. The parameter determination method according to claim 18, wherein, The determined parameters of the light-emitting element (21) include the rated current of the light-emitting element (21), the design current of the light-emitting element (21), and the rated luminous flux of the light-emitting unit; the target parameters include the number of light-emitting units of the light-emitting element (21).

20. The parameter determination method according to claim 12, wherein, The method further includes: The light power of the light-emitting device (20) is determined based on the light-emitting parameters of the light-emitting device (20); When the light power is outside the preset power range, adjust the parameters of the light-emitting device (20).

21. The parameter determination method according to claim 20, wherein, The light emission parameters include the number of light emission units of the light emission element (21), the electrical power of the light emission unit, the electro-optical conversion efficiency of the light emission element (21), and the optical path transmission loss of the light emission device (20).

22. The parameter determination method according to claim 12, wherein, The light-emitting element (21) further includes a lens (222), the lens (222) being located between the light-diffusing element (221) and the light-emitting element (21), and the method further includes: The first distance between the test lens (222) and the test light-emitting element (21) of the test sample is adjusted according to the preset step size to construct the first sample corresponding to different first distances. The test sample has the same structure as the light-emitting device (20). Obtain the light emission effect corresponding to each of the first samples; Based on the first distance corresponding to the first sample whose light emission effect meets the first preset requirement, the distance between the lens (222) and the light-emitting element (21) is determined.

23. The parameter determination method according to claim 22, wherein, The light emission effect includes light uniformity, intensity, and illuminance. The first preset requirement includes optimal light uniformity, or light uniformity within a preset uniformity range, and maximum intensity and illuminance.

24. The parameter determination method according to claim 23, wherein, The intensity is positively correlated with the first distance, the illuminance is positively correlated with the first distance, and the distance between the lens (222) and the light-emitting element (21) is determined based on the first distance corresponding to the first sample whose light emission effect meets the first preset requirement, including: Based on the light uniformity being within a preset uniformity range and the first distance corresponding to the first sample with the largest first distance, the distance between the lens (222) and the light-emitting element (21) is determined.

25. The parameter determination method according to claim 12, wherein, The light-emitting element (21) further includes a lens (222), the lens (222) being located between the light-diffusing element (221) and the light-emitting element (21), and the method further includes: The second distance between the test lens (222) and the test light homogenizer (221) of the test sample is adjusted according to the preset step size to construct a second sample corresponding to different second distances. The test sample has the same structure as the light-emitting device (20). Obtain the light emission effect corresponding to each of the second samples; The distance between the lens (222) and the light-diffusing element (221) is determined based on the second distance corresponding to the second sample whose light output effect meets the second preset requirement.

26. The parameter determination method according to claim 12, wherein, The optical module (22) further includes a lens (222) and a diffuser (223). The lens (222) is located between the light-diffusing element (221) and the light-emitting element (21), and the diffuser (223) is located between the light-emitting element (21) and the lens (222). The method further includes: The third distance between the test lens (222) and the test diffuser (223) of the test sample is adjusted according to the preset step size to construct a third sample corresponding to different third distances. The test sample has the same structure as the light-emitting device (20). Obtain the light emission effect corresponding to each of the third samples; The distance between the lens (222) and the diffuser (223) is determined based on the third distance corresponding to the third sample, which is based on the light output effect meeting the third preset requirement.

27. The parameter determination method according to claim 12, wherein, The optical module (22) further includes a lens (222), a diffuser (223), and a light guide (224). The lens (222) is located between the light homogenizer (221) and the light-emitting element (21). The diffuser (223) is located between the light-emitting element (21) and the lens (222). The light guide (224) has a light-guiding cavity. The light guide (224) includes a first end and a second end facing away from each other. The light-emitting element (21), the lens (222), and the diffuser (223) are located at the first end, and the light homogenizer (221) is located at the second end. The method further includes: The test length of the test light guide (224) of the test sample is adjusted according to the preset step length in the direction from the first end to the second end, so as to construct a fourth sample corresponding to different test lengths. The test sample has the same structure as the light-emitting device (20). Obtain the light emission effect corresponding to each of the fourth samples; The length of the light guide (224) in the direction from the first end to the second end is determined based on the test length corresponding to the fourth sample whose light emission effect meets the fourth preset requirement.

28. An electronic device (300) according to claim 1, wherein, Also includes: Processor (310), memory (320); and A computer program, wherein the computer program is stored in the memory and executed by the processor, the computer program comprising instructions for performing the parameter determination method according to any one of claims 12 to 27.

29. A non-volatile computer-readable storage medium (400) comprising a computer program according to claim 1, wherein, When the computer program (410) is executed by the processor (420), the processor performs the parameter determination method according to any one of claims 12-27.

Images