A projection device

Abstract

The application discloses a projection device, comprising: a light source assembly, a first optical assembly and a second optical assembly, the light beams emitted by the light source assembly are imaged after sequentially passing through the first optical assembly and the second optical assembly; the light source assembly comprises a red light source, a green light source and a blue light source; the first optical assembly is used for superimposing the light spots formed by the red light source, the green light source and the blue light source before the second optical assembly; and the second optical assembly is used for forming a projection pattern. The first optical assembly provided by the application can combine the emitted light beams output by multiple light source parts to form combined light rays, so that the multiple emitted light beams can be highly superimposed when being emitted. The projection device provided by the application can not only improve energy utilization, but also realize flexible semi-dynamic color gradient effect and color switching by adjusting the brightness ratio of the emitted light beams output by the multiple light source parts.

Description

Technical Field

[0001] This application relates to the field of optical device technology, and more particularly to a projection device. Background Technology

[0002] With the booming development of applications in consumer electronics, smart vehicles, and landscape decoration, consumers' demand for interactive lighting experiences is rapidly upgrading from basic lighting to scenario-based, intelligent, and personalized solutions. Following this industry trend, projection equipment, as a key component for achieving dynamic lighting effects, is also showing a shift in technological development from simple lighting functions towards "scenario-based, low-cost, and high-energy-efficiency" solutions, resulting in an industry landscape where multiple technological paths coexist.

[0003] Currently, the mainstream technology for achieving multi-color projection relies primarily on film for color rendering, which involves superimposing multiple light sources with different color channels to create static or dynamic images. However, these existing technologies reveal numerous inherent limitations in achieving complex lighting effects, making it difficult to meet the growing market demands. For example, using colored film as the color rendering medium is inherently costly to manufacture. More importantly, the color patterns on the film are fixed, making it impossible to achieve gradual color transitions or dynamic switching. If the projected color tone or pattern needs to be changed, redesign, plate making, and mold creation are necessary, which is not only costly but also has a long response time, failing to adapt to rapidly changing market and application needs. On the other hand, if multiple color light sources are assigned to different film sheets, the positions of multiple film sheets must be precisely aligned during assembly; even slight misalignment can lead to color mixing distortion and image blurring. It is worth mentioning that if RGB three-color LED light sources are directly used for color mixing and imaging, the color coordinates of the three light sources are difficult to accurately match the standard color gamut, resulting in deviations in the final projected colors.

[0004] Therefore, there is an urgent need to develop a projection device with gradually changing projection colors and stable projection effects. Utility Model Content

[0005] One objective of this application is to provide a projection device that improves projection effect, increases projection stability, and enhances energy utilization.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: a projection device, comprising: a light source assembly, a first optical assembly, and a second optical assembly, wherein the light beam emitted from the light source assembly forms an image after passing through the first optical assembly and the second optical assembly in sequence; the light source assembly includes a red light source, a green light source, and a blue light source; the first optical assembly is used to overlap the light spots formed by the red light source, the green light source, and the blue light source in front of the second optical assembly; the second optical assembly is used to form a projection pattern.

[0007] In some embodiments, the projection device further includes an image generation unit, which includes a transmissive film and a reflective film, and the image generation unit is disposed on the optical path between the first optical component and the second optical component.

[0008] In some embodiments, the light spots formed by the red light source, the green light source, and the blue light source overlap on the image generation unit.

[0009] In some embodiments, the projection device further includes an image generation unit, the image generation unit including a transmissive film, the image generation unit being disposed in the optical path between the light source assembly and the first optical assembly.

[0010] In some embodiments, the image generation unit includes a first film, a second film, and a third film; the first film is disposed in the optical path between the red light source and the first optical component; the second film is disposed in the optical path between the green light source and the first optical component; and the third film is disposed in the optical path between the blue light source and the first optical component.

[0011] In some embodiments, the first optical component includes a filter or at least two off-axis lens groups.

[0012] In some embodiments, the projection device further includes a first photoelectric detection unit, which is disposed in a target area on the light-incident side of the image generation unit, wherein the target area receives light but is not used for imaging.

[0013] In some embodiments, the projection device further includes a second photoelectric detection unit, which is used to collect the brightness and / or color temperature of the ambient light around the projection device.

[0014] In some embodiments, the intensity of the light beams emitted by the red light source, the green light source, and the blue light source is adjustable.

[0015] In some embodiments, the intensity of the light beams emitted by the red light source, the green light source, and the blue light source is determined based on the detection results of the first photoelectric detection unit.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: (1) By setting a first optical component, this application enables multiple outgoing beams to highly overlap during emission, forming a merged beam. This not only improves energy utilization but also allows for the switching of multiple colors by adjusting the light intensity of each light source. It is worth mentioning that the projection device provided by this application is simple and convenient to operate and easy to maintain, further enhancing its market competitiveness.

[0017] (2) Since existing projection equipment typically uses color film to project colored light, the projection equipment provided in this application can obtain semi-dynamic gradient colors by adjusting the brightness ratio between the emitted beams. Therefore, colored light can be projected using only black and white film, which is beneficial to improving economic efficiency. On the other hand, this application only requires the replacement of a single black and white film during maintenance, making it more convenient to operate than the multi-film solution. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the first exemplary projection device of this application.

[0019] Figure 2 This is a schematic diagram of the structure of the second exemplary projection device of this application.

[0020] Figure 3 This is a schematic diagram of the structure of the third exemplary projection device of this application.

[0021] Figure 4 This is a schematic diagram of the structure of the fourth exemplary projection device of this application.

[0022] Figure 5 This is a schematic diagram of the structure of the fifth exemplary projection device of this application.

[0023] Figure 6 This is a schematic diagram of the structure of the sixth exemplary projection device of this application.

[0024] Figure 7 This is a schematic diagram of the structure of the seventh exemplary projection device of this application.

[0025] Figure 8 This is a schematic diagram of the structure of the eighth exemplary projection device of this application.

[0026] Figure 9 This is a structural schematic diagram of the ninth exemplary projection device of this application.

[0027] Figure 10 This is a schematic diagram of the structure of some image generation units equipped with a first photoelectric detection unit in this application.

[0028] In the diagram: 1. Projection device; 10. Light source assembly; 11. First color light source unit; 12. Second color light source unit; 13. Third color light source unit; 20. First optical assembly; 21. Reflector; 211. First reflector; 212. Second reflector; 22. Off-axis lens; 23. Image generation unit; 231. First film; 232. Second film; 233. Third film; 234. Reflective film; 30. Second optical assembly; 31. Projection surface; 41. First photoelectric detection unit; 42. Second photoelectric detection unit. Detailed Implementation

[0029] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0030] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0031] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0032] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0033] like Figures 1-10As shown, this application provides a projection device 1, including: a light source assembly 10, a first optical assembly 20, and a second optical assembly 30. The light beam emitted from the light source assembly 10 is imaged after passing through the first optical assembly 20 and the second optical assembly 30 in sequence. The light source assembly 10 includes a first color light source section 11, a second color light source section 12, and a third color light source section 13. The light beam emitted from the first color light source section 11 can be one of red light, green light, and blue light. The light beam emitted from the second color light source section 12 can be one of red light, green light, and blue light. The light beam emitted from the third color light source section 13 can be one of red light, green light, and blue light. The first color light source section 11, the second color light source section 12, and the third color light source section 13 are adapted to emit light beams of different colors. The first optical assembly 20 is used to overlap the light spots formed by the first color light source section 11, the second color light source section 12, and the third color light source section 13 in front of the second optical assembly 30. The second optical assembly 30 is used to form a projection pattern. The second optical assembly 30 can be a lens group and defines an optical axis.

[0034] It should be understood that the intensity of the beams emitted by the first color light source unit 11, the second color light source unit 12, and the third color light source unit 13—that is, the red light source, the green light source, and the blue light source—is adjustable to change the color after the light spots overlap. In other words, by providing a first optical component 20 that can combine the beams output from multiple light source components 10 to form a light spot, this application enables a high degree of overlap between the multiple emitted beams during emission. This not only improves energy utilization but also allows for the switching of various colors by individually adjusting the light intensity of the emitted beams from the multiple light source components 10. It is worth mentioning that the projection device 1 provided by this application is simple and convenient to operate and easy to maintain, further enhancing its market competitiveness.

[0035] In some embodiments, such as Figure 1 , Figure 2 , Figure 4 and Figure 5 It is understood that at least one light source in the light source assembly 10 is positioned away from the optical axis so that its output beam is parallel to the optical axis or forms an angle with the optical axis. It is also understood that, since there are output beams that are away from the optical axis or form an angle with the optical axis, not all output beams are emitted along the optical axis. Furthermore, the first optical component 20 reflects the output beams that are not emitted along the optical axis, causing them to align with the optical axis, thereby allowing multiple output beams emitted along the optical axis to be precisely merged, resulting in a merged light beam. On the other hand, the precisely overlapping merged light beam can form a highly overlapping light spot on the projection surface 31, thereby improving the space utilization within the structure.

[0036] In some embodiments, the projection device 1 further includes an image generation unit 23 carrying image information. The image generation unit 23 is disposed in the optical path between the first optical component 20 and the second optical component 30. After the light spots overlap, they pass through the image generation unit 23 to obtain a combined light beam carrying image information. The second optical component 30 then projects the combined light beam carrying image information into an image. It can be understood that, through the image generation unit 23 disposed between the light source component 10 and the second optical component 30, the combined light beam carries image information after passing through the image generation unit 23. At this time, the second optical component 30 is adapted to receive the combined light beam carrying image information, thereby increasing the imaging quality and imaging stability.

[0037] In at least one specific embodiment, the image generation unit 23 includes a transmissive film and a reflective film, that is, the overlapping light spots obtained by the transmissive film and the reflective film carry image information.

[0038] In some embodiments, the light spots formed by the first color light source unit 11, the second color light source unit 12, and the third color light source unit 13 overlap on the image generation unit 23, thereby obtaining a combined light carrying image information.

[0039] In some embodiments, the projection device 1 further includes an image generation unit 23 carrying image information. The image generation unit 23 is disposed between the light source assembly 10 and the first optical assembly 20 along the light output path of the light source assembly 10, so that the emitted light beam carries image information, thereby obtaining a combined light beam carrying image information after the emitted light beams are combined. The image generation unit 23 includes a transmissive film. It is understood that by distributing the image generation unit 23 between the light source assembly 10 and the first optical assembly 20 along the light output path of the light source assembly 10, the emitted light beam can carry image information before reaching the first optical assembly 20, and then be reflected by the first optical assembly 20 to obtain a combined light beam carrying image information, which helps to improve the simplicity of the optical path. Furthermore, the dynamic effects of the projection are flexibly achieved through the on / off sequence of multiple optical channels, and monochrome patterns can be projected individually or in combination to present mixed color overlay patterns. The pattern switching is fast to adapt to simple animation scenes. When a semi-dynamic effect is required, the emitted light beam is adjusted based on the brightness ratio, enabling a continuous transition from monochrome to mixed colors for the same overlapping pattern, resulting in rich color gradations. Atmosphere changes can be created without mechanically switching image generation units 23, making operation convenient. At the same time, when a single image generation unit 23 is damaged, only that image generation unit 23 needs to be replaced, which helps reduce maintenance costs.

[0040] In some embodiments, the first optical component 20 includes a plurality of reflective sheets 21, which are used to reflect outgoing light beams that are not along the optical axis to the direction along the optical axis, so that multiple outgoing light beams coincide along the optical axis and form a merged light beam. The reflective sheet 21 is a filter, adapted to reflect light of a specific color and transmit light of other colors, thus each reflective sheet 21 is adapted to reflect an outgoing light beam of one color. The filter can efficiently reflect light of the target wavelength band or efficiently transmit light of other wavelength bands, thereby allowing outgoing light beams from multiple light source components 10 to be incident on the filter in different incident directions, resulting in light that can be incident from different directions but exit together along the optical axis. Therefore, the entire projection device 1 can be imaged by the second optical component 30 through only a single optical channel imaging path, which helps to reduce the cost of the projection device 1.

[0041] In some embodiments, such as Figure 1 and Figure 2 As shown, the light source assembly 10 includes a first color light source 11, a second color light source 12, and a third color light source 13. The light-emitting surface of the third color light source 13 is disposed opposite to the second optical assembly 30, and its output third color emitted beam is along the optical axis. The light-emitting surfaces of the first color light source 11 and the second color light source 12 are disposed opposite to each other on both sides of the optical axis. The reflector 21 includes a first reflector 211 and a second reflector 212 disposed in a cross configuration. The first color emitted beam emitted by the first color light source 11 is reflected by the first reflector 211 so that its light path is along the optical axis. The second color emitted beam emitted by the second color light source 12 is reflected by the second reflector 212 so that its light path is along the optical axis. It should be understood that the three light source assemblies 10 that output different colors of light are incident on the reflector 21 from three different directions, converge into a highly overlapping combined beam of light, and then emit together from a fourth direction. The light passes through the optical imaging path of a single optical channel and is imaged by the second optical assembly 30, which helps to reduce the cost of the projection device 1.

[0042] Furthermore, the cross-arranged first reflector 211 and second reflector 212 can precisely merge the emitted beams of three different colors of light during emission. The resulting merged light beams are emitted from almost the same position of the reflector 21, resulting in a single light path and good ease of operation.

[0043] In some embodiments, such as Figure 2As shown, the image generation unit 23 includes a first film 231, a second film 232, and a third film 233. The first film 231 is disposed between the first color light source unit 11 and the first optical component 20, and is disposed in a plane perpendicular to the light emission path of the first color light source unit 11. The second film 232 is disposed between the second color light source unit 12 and the first optical component 20, and is disposed in a plane perpendicular to the light emission path of the second color light source unit 12. The third film 233 is disposed between the third color light source unit 13 and the first optical component 20, and is disposed in a plane perpendicular to the light emission path of the third color light source unit 13. It is understandable that by setting the image generation unit 23 between the light source component 10 and the first optical component 20 along the light output path of the light source component 10, the emitted light beam can carry image information before reaching the first optical component 20, and then be reflected by the first optical component 20 to obtain a combined light beam carrying image information, which is beneficial to improving the simplicity of the optical path.

[0044] In at least one specific embodiment, the image generation unit 23 is a black and white film. It is worth noting that, since different colors of combined light can be obtained by adjusting the light intensity emitted from the light source assembly 10 in this application, a black and white film can be used to replace the color film used in the existing projection device 1, thereby reducing production costs while retaining rich color performance.

[0045] In at least one specific embodiment, the image generation unit 23 is a color film. Since the color film has built-in color filtering properties, it reduces the pressure on adjusting the brightness ratio of the light emitted from the light source component 10. Especially in scenarios requiring fixed colors, it helps improve color consistency, thereby reducing the risk of color shift due to parameter drift. On one hand, setting a single color film between the light source component 10 and the reflector 21 helps improve the internal structural simplicity of the projection device 1, and in scenarios with high requirements for color consistency, it eliminates the need for complex circuits to adjust light intensity, allowing the output of preset colors. On the other hand, setting multiple color films between the light source component 10 and the reflector 21 not only enhances color purity through the built-in color filtering properties of the color film and the adjustable light intensity, but also helps reduce the risk of interference from unwanted colors. In other words, the projected pattern obtained using a color film has higher color saturation and a more vibrant image. Furthermore, in low-complexity scenarios requiring the projection of fixed patterns or colors, the color film can further simplify system design, reducing development difficulty by eliminating the need for high-precision driving algorithms.

[0046] In some embodiments, the first optical component 20 further includes a reflective film 234 carrying image information. The reflective film 234 is disposed on the light-emitting path of the merged light rays and is adapted to reflect the merged light rays that are not along the optical axis to the direction along the optical axis, so that the merged light rays enter the second optical component 30 along the optical axis. It is worth mentioning that since the transparent pattern texture carried on the surface of the reflective film 234 can define the projection outline, the underlying reflective layer changes its propagation direction after receiving the emitted light beam, realizing the folding of the light path and further reducing the space occupied by the projection device 1. On the one hand, the emitted light beam does not need to penetrate the reflective film 234, but can be directly projected after reflection, which helps to reduce the risk of light loss due to transmission. On the other hand, the highly reflective coating of the reflective film 234 makes the light reflection efficiency higher than the light transmission efficiency of the transmissive film, thereby achieving higher projection brightness at the same power and having good energy saving performance. At the same time, when stray light in the reflective light path hits the surface of the reflective film 234, it will be directly reflected, making it difficult for stray light to enter the light path. This helps to increase the contrast and clarity of the image and make the layering of the projected image more prominent.

[0047] In some embodiments, such as Figure 6 and Figure 7As shown, the projection device 1 includes a first photoelectric detection unit 41 communicatively connected to the light source assembly 10. The first photoelectric detection unit 41 can be located in the target area on the light-incident side of the single image generation unit 23 between the reflector 21 and the second optical assembly 30. The target area is the area that receives the light source but is not used for imaging, that is, the edge of the single image generation unit 23 on the side where the combined light is incident. It should be understood that the first photoelectric detection unit 41 can also be located in the target area on the light-incident side of the first film 231, the second film 232, and the third film 233 between the three light source assemblies 10 and the reflector 21, that is, the edge of the first film 231, the second film 232, and the third film 233 on the side where each outgoing beam is incident. The first photoelectric detection unit 41 is adapted to detect the illumination parameters of the outgoing beam or combined light received by each image generation unit 23 and feed the illumination parameters back to the light source assembly 10, so that the light source assembly 10 adjusts the intensity of the output outgoing beam. Understandably, since the first photoelectric detection unit 41 is directly integrated into the four corners of the image generation unit 23, that is, set in the non-primary light-transmitting areas at the four corners of the incident surface of the image generation unit 23 that receives the emitted light beam, it captures and detects the corner light located in the corner areas, and monitors the brightness and ratio of the three colors of light in real time. This not only helps to improve light utilization, but also serves as a data reference for illumination parameters to assist in calibrating the illumination parameters of the main area located in the center, which helps to reduce interference and optimize detection accuracy with low cost. When the illumination parameters of the light source component 10 drift due to temperature changes or long-term use, the first photoelectric detection unit 41 feeds back the measured illumination parameter change data to the control chip in the light source component 10. The control chip drive circuit immediately adjusts the current of the corresponding light source component 10 to compensate for the deviation value. This improves the stability of the projected color and the imaging quality of the projected pattern without the need for manual calibration by the user.

[0048] In at least one specific embodiment, when multiple first photoelectric detection units 41 are respectively disposed at the edges of the first film 231, the second film 232 and the third film 233 between the three light source components 10 and the reflective sheet 21, each first photoelectric detection unit 41 can detect the actual light intensity of the emitted light beam of the corresponding light source component 10 after passing through the corresponding image generation unit 23 in real time, which is beneficial to improving the brightness consistency of the monochrome pattern.

[0049] In at least one specific embodiment, such as Figure 10 As shown, the image generation unit 23 with the first photoelectric detection unit 41 has a length and width of 10mm. At this time, the first photoelectric detection unit 41 can be set at the four corners of the image generation unit 23. The length of the first photoelectric detection unit 41 is 2mm and the width is 1.5mm. Its small size and its location in a non-central area ensure that the first photoelectric detection unit 41 will not affect the projection.

[0050] In some embodiments, such as Figures 6-9 As shown, the projection device 1 includes a second photoelectric detection unit 42 communicatively connected to the light source assembly 10. The second photoelectric detection unit 42 is located on the image side of the second optical assembly 30 and is suitable for collecting the brightness and / or color temperature parameters of the ambient light surrounding the projection device 1. It then feeds the measured parameters back to the light source assembly 10, enabling the light source assembly 10 to adjust the intensity of the output beam to reduce the impact of ambient light on the projection image. The second photoelectric detection unit 42, capable of detecting ambient light parameters, helps increase the imaging stability of the projection device 1 in complex lighting scenarios. It can project patterns with balanced brightness and pure color in different usage environments. Therefore, this combination of miniaturization, color accuracy, and adaptability allows the projection device 1 to be applied in size-sensitive and variable usage scenarios.

[0051] In some embodiments, the projection device 1 may be equipped with only the first photoelectric detection unit 41 or the second photoelectric detection unit 42, or both. It should be understood that using only a single photoelectric detector helps reduce the overall cost of the projection device 1. When both the first and second photoelectric detection units 41 and 42 are used, the first photoelectric detection unit 41 monitors the actual light intensity reaching the image generation unit 23, compensating for differences in light transmission in different areas, thus adapting to scenarios with varying lighting conditions and requiring consistency, such as outdoor camping and shopping mall windows. The second photoelectric detection unit 42 collects the brightness and color temperature of the ambient light in real time, enabling it to cope with complex light interference under different usage environments. When the first and second photoelectric detection units 41 and 42 transmit the detection data to the control chip in the light source assembly 10, the control chip calculates and automatically adjusts the power and brightness ratio of the light source assembly 10 through the drive circuit, facilitating end-to-end adaptive control, further increasing ease of use, and enhancing the imaging quality of the projection device 1.

[0052] Preferably, the beam intensities emitted by the first color light source unit 11, the second color light source unit 12, and the third color light source unit 13—that is, the red light source, the green light source, and the blue light source—are determined based on the detection results of the first photoelectric detection unit 41. The first photoelectric detection unit 41 feeds back the measured illumination parameter change data to the control chip in the light source assembly 10. The control chip's drive circuit immediately adjusts the current of the corresponding light source assembly 10 to compensate for deviations, thereby improving the stability of the projected colors and the imaging quality of the projected pattern without requiring manual calibration by the user.

[0053] In some embodiments, such as Figures 3-5As shown, the first optical component 20 includes at least two off-axis lenses 22. The off-axis lenses 22 are used to correct outgoing beams that are not along the optical axis, so that different outgoing beams coincide along the optical axis and form a merged light beam. It should be understood that when the divergence angle of the light source component 10 is large, the light will spread in a fan shape, which will cause multiple light source components 10 to send outgoing beams from different directions, thereby aggravating the divergence phenomenon. By setting the off-axis lenses 22, the propagation path of each outgoing beam is accurately refracted and corrected, ensuring that the outgoing beams corrected by the off-axis lenses 22 can uniformly cover the transparent pattern area of ​​the image generation unit 23, while also achieving a high degree of overlap on the projection surface 31 of the second optical component 30. On the other hand, by adjusting the brightness ratio between the light source components 10, multiple color switching can be achieved. The refraction correction of the off-axis lens 22 improves the imaging quality, thereby improving the overlap of light spots and energy utilization. The folding of the reflective film 234 helps to reduce the volume occupied, thus flexibly adapting to narrow spaces such as vehicle door panels and drawers, further improving the overall performance of the projection device 1.

[0054] It is worth mentioning that when the second optical component 30 is implemented as a plurality of off-axis lenses 22, the single image generation unit 23 is arranged between the off-axis lens 22 and the second optical component 30 along the optical path of the merged light rays. This helps to simplify the internal structure and reduce costs. The image generation unit 23 can use black and white film or color film to adapt to the use requirements of fixed patterns with color gradients. Moreover, only a single image generation unit 23 needs to be replaced during maintenance, making the operation convenient.

[0055] In at least one specific embodiment, when the first optical component 20 is implemented as a plurality of off-axis lenses 22, the reflective film 234 is disposed between the off-axis lens 22 and the second optical component 30 along the optical path of the combined light rays, which is suitable for reflecting the combined light rays that are not along the optical axis to the direction along the optical axis, so that the combined light rays enter the second optical component 30 along the optical axis, which is beneficial to realize the folding of the optical path and further reduce the space occupied by the projection device 1.

[0056] In some embodiments, such as Figures 3-5 As shown, the light source assembly 10 includes a first color light source section 11, a second color light source section 12, and a third color light source section 13. Each light source assembly 10 is arranged along a straight line or in a triangular arrangement. Each emitted beam is parallel to the optical axis. The off-axis lens 22 is used to correct the optical path of the multiple parallel beams to form a combined beam. It should be understood that, as... Figure 8As can be seen, when the light source components 10 are arranged along a straight line, there is a certain physical distance between them due to the horizontal arrangement. The off-axis lens 22 can flexibly adjust the angle of the emitted beam, focusing the light emitted by the light source components 10 on both sides towards the center, or allowing the emitted beams of two light source components 10 on the same side to converge on the other side. By specifically offsetting the horizontal and vertical spacing deviations, the three light paths ultimately achieve high overlap on the projection surface 31, avoiding the phenomenon of light spot superposition and misalignment caused by the triangular distribution of the light source components 10, ensuring uniform brightness and clear edges. In other words, by precisely controlling the single-lens eccentricity through the off-axis lens 22, the light offset phenomenon caused by the spacing between the light source components 10 can be reduced, achieving high overlap of the projected image and effectively avoiding light dispersion, ensuring uniform brightness and clear edges. Furthermore, the problem of multi-channel light spot overlap can be solved simply by adjusting the angle of the off-axis lens 22, which is beneficial for simultaneously improving performance and optimizing costs.

[0057] Understandably, when the light source components 10 are arranged in a triangular pattern, the precise adjustment of the off-axis lens 22 not only reduces the risk of brightness attenuation at the edges but also avoids stray light interference by calibrating the optical path, resulting in more uniform light coverage in the projected image and further improving the brightness consistency between the edges and center of the projected image. On one hand, the triangular arrangement of the light source components 10 reduces the dense distribution phenomenon that exists when the light source components 10 are arranged in a single straight line, thereby reducing heat dissipation interference and further improving the stability of the light source. Furthermore, the multi-dimensional adjustment capability of the off-axis lens 22 allows for adaptation and correction not only with three-dimensional spacing but also with good light overlap, making the spatial layout more flexible.

[0058] In some embodiments, reference Figure 9 As shown, when the first optical component 20 is implemented as a plurality of off-axis lenses 22 and the reflective film 234 is positioned between the off-axis lenses 22 and the second optical component 30 along the optical path of the combined light rays, the first photoelectric detection unit 41 is positioned in the non-transparent areas at the four corners of the incident surface of the reflective film 234 that receives the emitted light beam, and detects the actual illumination parameters after reflection in real time to ensure more stable projected colors. On the other hand, since the reflective film 234 can significantly deflect the light path, it can achieve folding of the light path, which helps to reduce the volume occupied by the projection device 1. Furthermore, the reflective film 234 has low power consumption and high anti-stray light characteristics, which can be combined with projected dynamic patterns and colors, while balancing volume, performance and practicality, representing an efficient upgrade to the basic architecture of the projection device 1.

[0059] Building upon this, a second photoelectric detection unit 42 can be provided on the image side of the second optical component 30 to dynamically acquire the characteristics of the external ambient light and adjust the parameters of the emitted beam accordingly. Furthermore, when the detected illumination parameters are fed back to the control chip of the light source component 10, the light intensity and brightness ratio of the light source component 10 are adjusted, thereby maintaining a stable projection effect even under conditions of sudden changes in light or temperature fluctuations. It should be understood that the simultaneous use of the first photoelectric detection unit 41 and the second photoelectric detection unit 42 not only improves projection quality but also increases adaptability to various usage environments, exhibiting good projection consistency in complex scenarios such as automotive applications.

[0060] In at least one specific embodiment, the first color light source unit 11, the second color light source unit 12 and the third color light source unit 13 are RGB LED light sources. Since each light source component 10 can be precisely calibrated, the brightness decay phenomenon caused by aging or temperature of different LED light sources can be dynamically compensated.

[0061] In at least one specific embodiment, the first color light source unit 11, the second color light source unit 12, and the third color light source unit 13 are RGB laser light sources. Due to the extremely strong monochromaticity of laser light, compared to the wide spectrum characteristics of LED light sources, laser light sources are more likely to achieve precise color control through brightness matching, resulting in higher color fidelity in the projected colors. Simultaneously, the brightness of the laser light source is 2 to 3 times that of an LED light source of the same power. Therefore, even after some light transmission loss occurs through the image generation unit 23, the emitted beam of the laser light source can maintain good projection quality at long distances or in strong light environments, expanding its application scenarios from close-range decoration to mid-to-long-range signage. On one hand, the low divergence angle and high color separation of the laser light source, combined with the image generation unit 23 that carries a clear outline of the projected pattern, helps to improve the edge sharpness of the projected pattern and reduce the edge light leakage phenomenon common in LED light sources, thus making it more suitable for projecting fine patterns. On the other hand, the nanosecond-level response speed of the laser ensures that dynamic patterns in the projection do not produce ghosting during switching, thus adapting to application scenarios that require both response speed and projection clarity.

[0062] It is worth mentioning that when the first color light source unit 11, the second color light source unit 12 and the third color light source unit 13 use RGB laser light sources and the first optical component 20 is an off-axis lens 22, the divergence angle of the laser light source is small. Therefore, a small off-axis lens 22 can be used. Thus, the size of the off-axis lens 22 used in LED light sources is smaller, increasing the compactness of the device.

[0063] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A projection device, characterized in that, include: A light source assembly, a first optical assembly, and a second optical assembly, wherein the light beam emitted from the light source assembly is imaged after passing through the first optical assembly and the second optical assembly in sequence; The light source assembly includes a red light source, a green light source, and a blue light source; The first optical component is used to overlap the light spots formed by the red light source, the green light source, and the blue light source in front of the second optical component; The second optical component is used to form a projection pattern.

2. The projection device according to claim 1, characterized in that, The projection device further includes an image generation unit, which includes a transmissive film and a reflective film, and the image generation unit is disposed on the optical path between the first optical component and the second optical component.

3. The projection device according to claim 2, characterized in that, The light spots formed by the red light source, the green light source, and the blue light source overlap on the image generation unit.

4. The projection device according to claim 1, characterized in that, The projection device further includes an image generation unit, which includes a transmissive film and is disposed on the optical path between the light source component and the first optical component.

5. The projection device according to claim 4, characterized in that, The image generation unit includes a first film, a second film, and a third film; The first film is disposed in the optical path between the red light source and the first optical component; The second film is disposed in the optical path between the green light source and the first optical component; The third film is positioned in the optical path between the blue light source and the first optical component.

6. The projection device according to any one of claims 1, 2, or 4, characterized in that, The first optical component includes a filter or at least two off-axis lens groups.

7. The projection device according to claim 2 or 4, characterized in that, The projection device further includes a first photoelectric detection unit, which is disposed in the target area on the light-incident side of the image generation unit. The target area receives light but is not used for imaging.

8. The projection device according to claim 7, characterized in that, The projection device also includes a second photoelectric detection unit, which is used to collect the brightness and / or color temperature of the ambient light around the projection device.

9. The projection device according to claim 1, characterized in that, The intensity of the light beams emitted by the red light source, the green light source, and the blue light source is adjustable.

10. The projection device according to claim 7, characterized in that, The intensity of the light beams emitted by the red light source, the green light source, and the blue light source is determined based on the detection results of the first photoelectric detection unit.

Images