Projection light machine and electronic device

Abstract

A projection light machine (100), comprising multiple light-emitting units (10), a light combining apparatus (20), and multiple optical filters (30) corresponding one-to-one with the multiple light-emitting units (10), the multiple light-emitting units (10) each being used to emit light beams of different colors. The light combining apparatus (20) comprises multiple incident surfaces (21), each incident surface (21) being disposed opposite a corresponding light-emitting unit (10), and the light combining apparatus (20) being used to combine and transmit light emitted by the multiple light-emitting units (10). Each optical filter (30) is located between the corresponding light-emitting unit (10) and the corresponding incident surface (21), and the optical filter (30) is used to transmit light emitted by the corresponding light-emitting unit (10) and absorb light emitted by other light-emitting units (10), so that stray light in the projection light machine (100) is reduced. Also provided is an electronic device.

Description

Projection light machine and electronic equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on November 30, 2023, with application number 202311638473.X and invention name “Projection optical machine and electronic equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of projection display technology, and in particular to a projection optical machine and electronic equipment. Background Art

[0003] Augmented reality (AR) display technology is a display technology that collects real-world information in real time and combines virtual information and images with the real world. The optical display system of an AR device usually consists of a micro-optical machine and an optical combiner, wherein the optical machine is a projection optical machine, which is used to generate an image and project the image onto the optical combiner, and the optical combiner is used to transmit the image generated by the optical machine into the user's eyes. Among them, the volume of the optical machine has a great influence on the overall volume of the AR device. In order to reduce the overall volume of the optical machine, the light-emitting panels of different colors in the optical machine are respectively arranged around the color-combining prism, and a dichroic coating is arranged in the middle of the color-combining prism, so that light of different colors enters the optical machine lens through the color-combining prism. However, the dichroic coating is greatly affected by the angle of the incident light, and stray light is prone to appear in the optical machine. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present application is to provide a projection optical machine and electronic equipment that can reduce stray light.

[0005] In a first aspect, an embodiment of the present application provides a projection light engine, which includes a plurality of light-emitting units, a light-combining device and a plurality of filters corresponding to the plurality of light-emitting units; the plurality of light-emitting units are respectively used to emit light beams of different colors; the light-combining device includes a plurality of incident surfaces, each incident surface is arranged opposite to a corresponding light-emitting unit, and the light-combining device is used to combine the light beams emitted by the plurality of light-emitting units and then emit them; each filter is located between the corresponding light-emitting unit and the corresponding incident surface, and the filter is used to pass the light beam emitted by the corresponding light-emitting unit and absorb the light beams emitted by other light-emitting units.

[0006] Each light-emitting unit is prone to refraction inside the light-combining device, and the light irradiated to other light-emitting units causes stray light in the projection light machine. By setting a filter between each light-emitting unit and the corresponding incident surface, the filter corresponding to the light-emitting unit can absorb the light beams irradiated to the light-emitting unit by other light-emitting units, thereby reducing the stray light in the projection light machine, and the filter corresponding to the light-emitting unit can pass through the light beams emitted by the light-emitting unit to achieve full-color display of the projection light machine.

[0007] In combination with the first aspect, in a possible implementation, the filter is attached to the corresponding incident surface.

[0008] In this possible implementation, the filter is fixed on the incident surface of the light combining device, and the space between the light emitting unit and the incident surface is fully utilized to improve space utilization.

[0009] In combination with the first aspect, in a possible implementation, the light-emitting unit includes a substrate and color pixels, the color pixels are arranged on the substrate, and the color pixels include active light-emitting elements; the filter element is covered on the substrate of the corresponding light-emitting unit, and the active light-emitting element is located between the substrate and the filter.

[0010] In this possible implementation, the filter replaces the cover of the light-emitting unit and is directly packaged on the substrate of the light-emitting unit, which can shorten the distance between the light-emitting unit and the incident surface, reduce the overall volume of the projection light machine, and reduce the assembly process.

[0011] In combination with the first aspect, in a possible implementation, along the arrangement direction of the filter and the light-emitting unit, two opposite surfaces of the filter are both planes.

[0012] In this possible implementation, the two opposite surfaces of the filter are set to be planes, reducing the diffuse reflection of the light beam emitted by the light-emitting unit in the process of being incident on the plane of the filter and then incident on the light combining device from the plane on the other side of the filter, thereby effectively reducing the stray light in the projection light machine.

[0013] In combination with the first aspect, in a possible implementation, the plurality of light-emitting units include a first light-emitting panel, a second light-emitting panel and a third light-emitting panel, the colors of the light beams emitted by the first light-emitting panel, the second light-emitting panel and the third light-emitting panel are different, the plurality of filters include a first filter, a second filter and a third filter, and the plurality of incident surfaces include a first incident surface, a second incident surface and a third incident surface; the first filter is arranged between the first light-emitting panel and the first incident surface; the first filter is used to pass the light beam emitted by the first light-emitting panel and absorb the light beams emitted by the second light-emitting panel and the third light-emitting panel; the second filter is arranged between the second light-emitting panel and the second incident surface, the second filter is used to pass the light beam emitted by the second light-emitting panel and absorb the light beams emitted by the first light-emitting panel and the third light-emitting panel; the third filter is arranged between the third light-emitting panel and the third incident surface, the third filter is used to pass the light beam emitted by the third light-emitting panel and absorb the light beams emitted by the first light-emitting panel and the second light-emitting panel.

[0014] In this possible implementation, the first filter can transmit the light beam emitted by the first light-emitting panel, the second filter can transmit the light beam emitted by the second light-emitting panel, and the third filter can transmit the light beam emitted by the third light-emitting panel to achieve full-color display; wherein, the first filter can also absorb the light beam emitted by the second light-emitting panel and refracted by the light-combining device to illuminate the first incident surface, and the light beam emitted by the third light-emitting panel to refracted by the light-combining device to illuminate the first incident surface, thereby reducing the possibility of the light beams emitted by the second light-emitting panel and the third light-emitting panel forming stray light, thereby reducing the stray light in the projection light machine; similarly, the second filter can also absorb the light beam emitted by the first light-emitting panel and refracted by the light-combining device to illuminate the first incident surface. The light beam emitted by the panel and refracted by the light combining device to illuminate the second incident surface, as well as the light beam emitted by the third light-emitting panel and refracted by the light combining device to illuminate the second incident surface, reduce the possibility of the light beams emitted by the first light-emitting panel and the third light-emitting panel forming stray light, and reduce the stray light in the projector; the third filter can also absorb the light beam emitted by the first light-emitting panel and refracted by the light combining device to illuminate the third incident surface, as well as the light beam emitted by the second light-emitting panel and refracted by the light combining device to illuminate the third incident surface, reduce the possibility of the light beams emitted by the first light-emitting panel and the second light-emitting panel forming stray light, and reduce the stray light in the projector.

[0015] In combination with the first aspect, in one possible implementation, the wavelength band of the light beam emitted by the first light-emitting panel is greater than or equal to 600nm, and the wavelength band of the light beam emitted by the second light-emitting panel and the third light-emitting panel is less than 600nm; for the visible light band greater than or equal to 600nm, the average transmittance of the first filter is greater than or equal to 50%, and the average absorptivity of the first filter is less than or equal to 50%; for the visible light band less than 600nm, the average transmittance of the first filter is less than or equal to 30%, and the average absorptivity of the first filter is greater than or equal to 70%.

[0016] In this possible implementation, for the light beam emitted by the first light-emitting panel, the average transmittance of the first filter is greater than or equal to 50% and the average absorptivity of the first filter is less than or equal to 50%, ensuring that the light beam emitted by the first light-emitting panel can pass through the first filter as much as possible and will not be absorbed too much by the first filter, thereby improving the display effects such as color accuracy and contrast of the projection light machine; for the light beam emitted by the second light-emitting panel and the third light-emitting panel, the average transmittance of the first filter is less than or equal to 30%, so that the light beams emitted by other light-emitting panels after being irradiated on the first incident surface can pass through the first filter as little as possible; for the light beams emitted by the second light-emitting panel and the third light-emitting panel, the average absorptivity of the first filter is greater than or equal to 70%, so that the first filter can absorb as much light beams irradiated on the first filter by other light-emitting panels as possible, reducing the possibility of light beams irradiated on the first incident surface by other light-emitting panels forming stray light, thereby reducing the stray light in the projection light machine.

[0017] In combination with the first aspect, in one possible implementation, the wavelength band of the light beam emitted by the second light-emitting panel is less than or equal to 480 nm, and the wavelength band of the light beam emitted by the first light-emitting panel and the third light-emitting panel is greater than 480 nm; for the visible light band less than or equal to 480 nm, the average transmittance of the second filter is greater than or equal to 50%, and the average absorptivity of the second filter is less than or equal to 50%; for the visible light band greater than 480 nm, the average transmittance of the second filter is less than or equal to 30%, and the average absorptivity of the second filter is greater than or equal to 70%.

[0018] In this possible implementation, for the light beam emitted by the second light-emitting panel, the average transmittance of the second filter is greater than or equal to 50% and the average absorptivity of the second filter is less than or equal to 50%, ensuring that as much of the light beam emitted by the second light-emitting panel as possible can pass through the second filter and will not be absorbed too much by the second filter, thereby improving the display effects such as color accuracy and contrast of the projector; for the light beam emitted by the first light-emitting panel and the third light-emitting panel, the average transmittance of the second filter is less than or equal to 30%, so that as little light beam from other light-emitting panels can pass through the second filter after being irradiated on the second incident surface as possible; for the light beam emitted by the first light-emitting panel and the third light-emitting panel, the average absorptivity of the second filter is greater than or equal to 70%, so that the second filter can absorb as much light beam from other light-emitting panels irradiated on the second filter as possible, reducing the possibility of light beams from other light-emitting panels irradiated on the second incident surface forming stray light, thereby reducing the stray light in the projector.

[0019] In combination with the first aspect, in one possible implementation, the wavelength band of the light beam emitted by the third light-emitting panel is greater than 480nm and less than 600nm, the wavelength band of the light beam emitted by the first light-emitting panel is greater than or equal to 600nm, and the wavelength band of the light beam emitted by the second light-emitting panel is less than or equal to 480nm; for the visible light band greater than 480nm and less than 600nm, the average transmittance of the third filter is greater than or equal to 50%, and the average absorptivity of the third filter is less than or equal to 50%; for the visible light band greater than or equal to 600nm and the visible light band less than or equal to 480nm, the average transmittance of the third filter is less than or equal to 30%, and the average absorptivity of the third filter is greater than or equal to 70%.

[0020] In this possible implementation, for the light beam emitted by the third light-emitting panel, the average transmittance of the third filter is greater than or equal to 50% and the average absorptivity of the third filter is less than or equal to 50%, ensuring that as much of the light beam emitted by the third light-emitting panel as possible can pass through the third filter and will not be absorbed too much by the third filter, thereby improving the display effects such as color accuracy and contrast of the projection light machine; for the light beam emitted by the first light-emitting panel and the second light-emitting panel, the average transmittance of the third filter is less than or equal to 30%, so that as little light beam from other light-emitting panels can pass through the third filter after being irradiated on the third incident surface as possible; for the light beam emitted by the first light-emitting panel and the second light-emitting panel, the average absorptivity of the third filter is greater than or equal to 70%, so that the third filter can absorb as much light beam from other light-emitting panels irradiated on the third filter as possible, reducing the possibility of light beams from other light-emitting panels irradiated on the third incident surface forming stray light, thereby reducing the stray light in the projection light machine.

[0021] In combination with the first aspect, in a possible implementation, the light combining device includes an exit surface, and a first dichroic emitting surface and a second dichroic reflecting surface arranged crosswise, the first dichroic emitting surface and the second dichroic reflecting surface being located in a space surrounded by the exit surface and a plurality of incident surfaces, the light beam emitted by the first light-emitting panel is reflected by the first incident surface and the first dichroic reflecting surface and then emitted from the exit surface; the light beam emitted by the second self-luminous panel is reflected by the second incident surface and the second dichroic reflecting surface and then emitted from the exit surface; the light beam emitted by the third light-emitting panel is emitted from the exit surface via the third incident surface, the first dichroic reflecting surface and the second dichroic reflecting surface.

[0022] In this possible implementation, the first dichroic emission surface and the second dichroic emission surface are located in a space enclosed by multiple incident surfaces and exit surfaces, so that the overall space utilization rate of the projection light machine is high, which is conducive to reducing the overall volume of the projection light machine.

[0023] In combination with the first aspect, in one possible implementation, the first incident surface is arranged opposite to and parallel to the second incident surface, the third incident surface is arranged opposite to and parallel to the exit surface, the first incident surface is perpendicular to the third incident surface, the first incident surface intersects with the first dichroic reflective surface, and the first incident surface intersects with the first dichroic reflective surface.

[0024] In combination with the first aspect, in a possible implementation, the projection light engine also includes multiple lens arrays corresponding one-to-one to the multiple light-emitting units, each lens array is arranged between the light-emitting unit and the incident surface, and the lens array is used to reduce the divergence angle of the light beam emitted by the corresponding light-emitting unit.

[0025] In this possible implementation, a lens array is set between the light-emitting unit and the incident surface, so that the light beam emitted by the light-emitting unit can pass through the lens array to reduce the divergence angle of the light beam incident into the light combining device, so that the reflectivity of the light beam irradiated into the light combining device is higher, which is beneficial to improving the display effect of the projection light machine.

[0026] In a second aspect, an embodiment of the present application provides an electronic device, which includes a mainboard and a projection light engine as in any implementation of the first aspect, wherein the projection light engine is arranged on the mainboard. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0028] FIG1 is a schematic structural diagram of a projection optical engine in the related art;

[0029] FIG2 is a schematic structural diagram of another related art projection optical engine;

[0030] FIG3 is a schematic structural diagram of a projection optical engine in another related art;

[0031] FIG4 is a graph showing the relationship between the reflectivity of a blue dichroic coating and wavelength;

[0032] FIG5 is a schematic diagram of stray light in a projection optical machine in the related art;

[0033] FIG6 is a schematic structural diagram of a projection optical engine provided by an embodiment of the present application;

[0034] FIG7 is a schematic structural diagram of another optical projection engine provided by an embodiment of the present application;

[0035] FIG8a is a schematic structural diagram of a configuration of a lens array in a projection optical machine provided in one embodiment of the present application;

[0036] FIG8 b is a schematic structural diagram of another configuration of a lens array in a projection optical machine provided in one embodiment of the present application;

[0037] FIG8c is a structural diagram of another configuration of a lens array in a projection optical machine provided in an embodiment of the present application.

[0038] Explanation of the accompanying drawings: Projection light engine-100, light-emitting unit-10, first light-emitting panel-10a, second light-emitting panel-10b, third light-emitting panel-10c, substrate-11, active light-emitting device-12, cover plate-13, light combining device-20, incident surface-21, first incident surface-21a, second incident surface-21b, third incident surface-21c, exit surface-22, first dichroic reflection surface-23, second dichroic reflection surface-24, filter element-30, first filter-30a, second filter-30b, third filter-30c, lens-40, lens array-50. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of this application clearer, this application will be further described in detail below with reference to the accompanying drawings.

[0040] With the continuous development of active light-emitting display technology, the size of organic light-emitting diodes (OLEDs) and light-emitting diodes (LEDs) continues to shrink. Micro OLEDs and Micro LEDs driven by CMOS process circuits can now achieve pixel sizes below 10μm, even down to the nanometer level. If an actively emitting Micro OLED or Micro LED is used as the image source, the image on the Micro OLED or Micro LED panel can be projected directly through a lens assembly. Because components such as a light source, light homogenizer, and prisms are not required, the projection system can be greatly simplified and the size of the projection machine reduced, facilitating the realization of an extremely small projection machine suitable for AR glasses.

[0041] Based on the display principle and preparation process, the full-color optical-mechanical solutions of active light-emitting devices Micro LED and Micro OLED include spatially separated color pixels and color combination solutions, among which the color combination solutions are further divided into pixel-level color combination and prism color combination solutions.

[0042] The principle of spatially separated color pixels is similar to that of common LCD or OLED panels, using a single light-emitting panel to achieve full-color illumination. As shown in Figure 1, in a related technology, each pixel is composed of spatially separated RGB sub-pixels. Due to the limited resolution of the human eye, when the sub-pixel size is small enough, the human eye cannot distinguish the spatial separation of the RGB sub-pixels, but instead sees them as a single full-color pixel, achieving full-color display. In AR optical machines, this color active light-emitting pixel array is used as the display panel, and then directly projected through a lens group. This solution is more difficult for Micro LEDs to manufacture.

[0043] Based on the Micro LED display panel, for the preparation process, due to the characteristics of LED materials, LED light-emitting devices need to be epitaxially grown on a special substrate (such as a sapphire substrate), and different colors of LEDs need to be grown and prepared separately due to the different light-emitting materials. Then, the RGB sub-pixels are transferred to the target CMOS circuit substrate through mass transfer technology, which leads to high complexity and low yield of the entire processing technology. In order to avoid the process of multiple mass transfers, another manufacturing process is to first prepare a monochrome Micro LED light-emitting panel (such as blue light Micro LED) through a more mature process. The number of blue light Micro LED pixels is 3 times that of the target display pixels. Then, through a special process, the light conversion material (such as green light quantum dots or red light quantum dots) is prepared on the sub-pixel size of the target blue Micro LED. The target light conversion material is then photoexcited by the blue light Micro LED to display green pixels and red pixels, thereby realizing a full-color light-emitting panel.

[0044] In addition, for Micro OLED panels, spatially separated full-color Micro OLED panels can be prepared directly through traditional processes (such as evaporation, inkjet printing, etc.).

[0045] However, for both Micro LED and Micro OLED, the spatially separated color pixel structure results in a true display resolution of only one-third of the sub-pixel resolution, resulting in a loss of resolution. Given a fixed sub-pixel size (the minimum sub-pixel size is usually limited by processing technology and performance), either the actual display resolution is sacrificed, such as with 1920*1080 sub-pixels, only a resolution of 1920*1080 / 3 can be displayed; or the number of sub-pixels is increased, such as using 1920*1080*3 sub-pixels to display a resolution of 1920*1080. However, if the sub-pixel size cannot be reduced, this will increase the size of the display panel, further increasing the volume of the optical engine.

[0046] In order to solve the process limitations of spatially separated full-color Micro LEDs and the mutual constraints between resolution and volume, another related technology proposed a vertical stacking structure solution. As shown in Figure 2, the RGB sub-pixels are no longer separated in the plane space, but are stacked in the vertical direction. The light is guided out of the panel through the light-guiding structure at the edge of the pixel to achieve upward emission. The advantage of this solution is that the color sub-pixels are stacked in the vertical space without sacrificing the area in the plane direction. Therefore, the actual displayed resolution is consistent with the number of pixels in the plane direction, without sacrificing resolution. However, the process preparation of this solution involves the vertical stacking of RGB color pixels and the preparation of the sidewall light-guiding structure, which is very difficult.

[0047] Because the manufacturing process for spatially separated and vertically stacked full-color Micro LEDs is very difficult, another related technology proposes using three single-color RGB Micro LED panels to combine light through a light-combining prism, as shown in Figure 3, to achieve a full-color image, which is then projected through a lens assembly. In this solution, blue light and red light are respectively reflected by the blue dichroic coating and red dichroic coating set in the middle of the light-combining prism and enter the optical machine lens. At the same time, green light directly penetrates the light-combining prism and enters the optical machine lens, thus achieving full-color display through the light-combining prism.

[0048] Ideally, a blue dichroic coating can have 100% reflectivity for light at any angle in the blue band and 100% transmittance for visible light at any angle in other bands. However, the actual blue dichroic coating has quite different spectral curves depending on the angle of the incident light. As shown in Figure 4, light incident at minus 13 degrees still has a reflectivity of nearly 100% at a wavelength of 512nm (blue-green light), while for light incident at 13 degrees, the reflectivity for 484nm blue light is reduced to approximately 0%. When the incident angle is outside of plus or minus 13 degrees, the difference will be even greater, while the angle of light emitted by the Micro LED light-emitting panel is within the range of plus or minus 75 degrees. Due to the wavelength / angle characteristics of the dichroic coating, the combined full-color Micro LED optical engine solution has problems as shown in Figure 5. The large-angle light emitted by the blue Micro LED panel shines on the blue dichroic coating. Due to the large angle of the light, the reflectivity of the blue dichroic coating cannot reach 100%, so some light continues to pass through the blue dichroic coating. The forward light can have multiple paths, such as the light shown by the dotted arrow in Figure 5. The light shines on the surface of the red Micro LED panel, is reflected by the cover glass on its surface, shines on the green Micro LED panel, and then reflects through the cover glass on its surface, and finally enters the lens group.

[0049] Since this part of the light does not follow the ideal path, it cannot be accurately resolved by the lens, eventually forming stray light in the entire optical system (the light indicated by the dotted arrow in Figure 5), affecting the final display effect.

[0050] The technical solutions of the embodiments of the present application are described below.

[0051] The present application provides an electronic device, which may be an AR device, such as AR glasses or a head-mounted device.

[0052] Please refer to Figure 6, which is a schematic diagram of the structure of a projection light engine 100 provided in one embodiment of the present application. The electronic device includes the projection light engine 100 provided in the present application and a mainboard, on which the projection light engine 100 is mounted. The mainboard is used to fix the projection light engine 100.

[0053] In one embodiment, the projection optical machine 100 is a self-luminous projection display system, and the projection optical machine 100 is the light source for image display of the electronic device. The light beam emitted by the projection optical machine 100 enters the optical waveguide structure through the coupling structure of the optical waveguide structure, and then the light is coupled out to the human eye by the coupling structure of the optical waveguide structure. The coupled light forms a virtual image, so the human eye can see the virtual image. Among them, the projection optical machine 100 is a full-color optical machine, so it can form a full-color image.

[0054] The optical projector 100 includes a plurality of light-emitting units 10, a light-combining device 20, a plurality of filters 30 corresponding to the plurality of light-emitting units 10, and a lens 40. The plurality of light-combining units are arranged around the light-combining device 20. The plurality of light-emitting units 10 are respectively configured to emit light beams of different colors. The filters 30 are located between the light-emitting units 10 and the light-combining device 20, and the filters 30 and the corresponding light-emitting units 10 are arranged relative to each other. The filter 30 corresponding to a light-emitting unit 10 can transmit the light beam emitted by the light-combining unit 10 while absorbing the light beams emitted by other light-emitting units 10. The light beams emitted by the plurality of light-emitting units 10 are imaged on an imaging plane after passing through the light-combining device 20 and the lens 40. The imaging plane can be at infinity behind the lens 40. When the optical projector 100 is used in, for example, AR glasses, the light beams from the optical projector 100 passing through the lens 40 can be reflected to the user's eyes, so that the user can see the image projected by the optical projector 100 through the AR glasses.

[0055] Each light-emitting unit 10 is prone to refraction inside the light-combining device 20, and irradiates other light-emitting units 10, causing stray light in the projector 100. By setting a filter 30 between each light-emitting unit 10 and the corresponding incident surface 21, the filter 30 corresponding to the light-emitting unit 10 can absorb the light beam irradiated to the light-emitting unit 10 by other light-emitting units 10, thereby reducing the stray light in the projector 100, and the filter 30 corresponding to the light-emitting unit 10 can pass through the light beam emitted by the light-emitting unit 10 to achieve color display of the projector 100.

[0056] Each light-emitting unit 10 includes a substrate 11 and color pixels. The color pixels are arranged on the substrate 11. There are multiple color pixels, and the multiple color pixels are distributed in a matrix. The color pixels are used to emit color light beams.

[0057] The color pixel includes an active light-emitting device 12 , which may be a Micro LED or a Micro OLED. The active light-emitting device 12 is located between the substrate 11 and the cover plate 13 , and is used to emit a color light beam.

[0058] In one embodiment, the light-emitting unit 10 further includes a cover plate 13 , which covers the substrate 11 and is used to encapsulate the color pixels mounted on the substrate 11 . The color light beam emitted by the active light-emitting device 12 is emitted toward the light combining device 20 through the cover plate 13 .

[0059] The multiple light-emitting units 10 include a first light-emitting panel 10a, a second light-emitting panel 10b and a third light-emitting panel 10c. The first light-emitting panel 10a, the second light-emitting panel 10b and the third light-emitting panel 10c respectively emit light beams of different colors. For example, the first light-emitting panel 10a emits a red light beam with a wavelength greater than or equal to 600nm, the second light-emitting panel 10b emits a blue light beam with a wavelength less than or equal to 480nm, and the third light-emitting panel 10c emits a green light beam with a wavelength greater than 480nm and less than 600nm. The first light-emitting panel 10a, the second light-emitting panel 10b and the third light-emitting panel 10c are combined by a light combining device 20, which on the one hand ensures the small size of the projection light machine 100, and on the other hand realizes the emission of colored light beams to achieve full-color display.

[0060] The light-combining device 20 includes multiple incident surfaces 21, exit surfaces 22, a first dichroic reflective surface 23, and a second dichroic reflective surface 24. Each incident surface 21 is disposed opposite a corresponding light-emitting unit 10. Each filter 30 is positioned between the corresponding light-emitting unit 10 and the corresponding incident surface 21. The first dichroic reflective surface 23 and the second dichroic reflective surface 24 are disposed in an intersecting manner. The multiple incident surfaces 21 and exit surfaces 22 surround the first and second dichroic reflective surfaces 23 and 24. For example, the first light-emitting panel 10a corresponds to one incident surface 21, the second light-emitting panel 10b corresponds to another incident surface 21, and the third light-emitting panel 10c corresponds to yet another incident surface 21. Light from the first, second, and third light-emitting panels 10a, 10b, and 10c enters the light-combining device 20 through their corresponding incident surfaces 21, is combined by the first and second dichroic reflective surfaces 23 and 24 in the light-combining device 20, and then exits through the exit surface 22.

[0061] For example, the multiple incident surfaces 21 include a first incident surface 21a, a second incident surface 21b, and a third incident surface 21c. The first incident surface 21a is arranged opposite and parallel to the second incident surface 21b, and the third incident surface 21c is arranged opposite and parallel to the exit surface 22. The first incident surface 21a and the third incident surface 21c are perpendicular to each other. The first dichroic reflective surface 23 and the second dichroic reflective surface 24 are located in a space surrounded by the first incident surface 21a, the second incident surface 21b, the third incident surface 21c, and the exit surface 22. The first incident surface 21a intersects with the first dichroic reflective surface 23, and the first incident surface 21a intersects with the second dichroic reflective surface 24. The light beams emitted by the first light-emitting panel 10a, the second light-emitting panel 10b, and the third light-emitting panel 10c are respectively combined and emitted from the exit surface 22 after passing through the light combining device 20, the first dichroic reflective surface 23, and the second dichroic reflective surface 24.

[0062] The light combining device 20 is a rectangular prism, and the first incident surface 21a, the second incident surface 21b, the third incident surface 21c and the exit surface 22 are the four surfaces of the light combining device 20. The first dichroic reflection surface 23 and the second dichroic reflection surface 24 are arranged between the first incident surface 21a, the second incident surface 21b, the third incident surface 21c and the exit surface 22, so that the overall space utilization rate of the projection light machine 100 is high, which is conducive to reducing the overall volume of the projection light machine 100.

[0063] Among them, the first light-emitting panel 10a is arranged opposite to the first incident surface 21a, and the light beam emitted by the first light-emitting panel 10a is reflected by the corresponding filter 30, the first incident surface 21a, and the first dichroic reflective surface 23, and then emitted from the exit surface 22 to the lens 40; the second light-emitting panel 10b is arranged opposite to the second incident surface 21b, and the light beam emitted by the second light-emitting panel 10b is reflected by the corresponding filter 30, the second incident surface 21b, and the second dichroic reflective surface 24, and then emitted from the exit surface 22 to the lens 40; the third light-emitting panel 10c is arranged opposite to the third incident surface 21c, and the light beam emitted by the third light-emitting panel 10c is reflected by the corresponding filter 30, the third incident surface 21c, the first dichroic reflective surface 23, and the second dichroic reflective surface 24, and then emitted from the exit surface 22 to the lens 40.

[0064] When the first light-emitting panel 10a emits a red light beam, the second light-emitting panel 10b emits a blue light beam, and the third light-emitting panel 10c emits a green light beam, the first dichroic reflective surface 23 is a red dichroic reflective surface, and the first dichroic reflective surface 23 is used to reflect the red light beam emitted by the first light-emitting panel 10a, the blue light beam emitted through the second light-emitting panel 10b, and the green light beam emitted through the third light-emitting panel 10c; the second dichroic reflective surface 24 is a blue dichroic reflective surface, and the second dichroic reflective surface 24 is used to reflect the blue light beam emitted by the second light-emitting panel 10b, the red light beam emitted through the first light-emitting panel 10a, and the green light beam emitted through the third light-emitting panel 10c.

[0065] In one embodiment, the filter 30 is attached to the corresponding incident surface 21. That is, the filter 30 corresponding to the first light-emitting panel 10a is attached to the first incident surface 21a, the filter 30 corresponding to the second light-emitting panel 10b is attached to the second incident surface 21b, and the filter 30 corresponding to the third light-emitting panel 10c is attached to the third incident surface 21c. For example, when each light-emitting unit 10 is provided with a corresponding cover plate 13, attaching the filter 30 to the corresponding incident surface 21 fully utilizes the space between the light-emitting unit 10 and the incident surface 21, thereby improving space utilization.

[0066] As shown in Figure 7, in another embodiment, the filter 30 is covered on the substrate 11, and the color pixels of the light-emitting unit 10 are located between the substrate 11 and the filter 30. That is, the light-emitting unit 10 is not provided with a cover 13, and the filter 30 replaces the cover 13 of the light-emitting unit 10, and the filter 30 is directly encapsulated on the substrate 11 of the light-emitting unit 10. In this way, the distance between the light-emitting unit 10 and the incident surface 21 can be shortened, the overall volume of the projector light engine 100 is reduced, and the assembly process is reduced.

[0067] Along the arrangement direction of the filter 30 and the light-emitting unit 10, the two opposite surfaces of the filter 30 are both planes, which reduces the diffuse reflection of the light beam emitted by the light-emitting unit 10 in the process of being incident on the plane of the filter 30 and then incident on the light combining device 20 from the plane on the other side of the filter 30, thereby effectively reducing the stray light in the projection light machine 100.

[0068] The multiple filters 30 include a first filter 30a, a second filter 30b, and a third filter 30c. The first filter 30a is arranged between the first light-emitting panel 10a and the first incident surface 21a, the second filter 30b is arranged between the second light-emitting panel 10b and the second incident surface 21b, and the third filter 30c is arranged between the third light-emitting panel 10c and the third incident surface 21c.

[0069] When the first light-emitting panel 10a emits a red light beam, the second light-emitting panel 10b emits a blue light beam, and the third light-emitting panel 10c emits a green light beam, the first filter 30a can be a red glass panel, the second filter 30b can be a blue glass panel, and the third filter 30c can be a green glass panel, thereby reducing the production cost of the filter 30.

[0070] The first filter 30a is used to pass the light beam emitted by the first light-emitting panel 10a. The part of the light beam emitted by the first light-emitting panel 10a that passes through the first filter 30a is combined with the light beams emitted by the second light-emitting panel 10b and the third light-emitting panel 10c to achieve full-color display of the projection light machine 100.

[0071] The first optical filter 30a is capable of absorbing light beams of a different color than that emitted by the first light-emitting panel 10a. For example, the first optical filter 30a absorbs light beams emitted by the second and third light-emitting panels 10b and 10c. Specifically, because the second dichroic reflective surface 24 cannot achieve 100% reflectivity for the light beams emitted by the second light-emitting panel 10b, a portion of the light beams emitted by the second light-emitting panel 10b pass through the second dichroic reflective surface 24 and illuminate the first incident surface 21a. The light beam indicated by the dotted line in FIG6 is the light beam that illuminates the first incident surface 21a. The first optical filter 30a is provided at the first incident surface 21a to absorb this portion of the light beam, thereby preventing stray light from forming in the entire projector 100, thereby improving the color accuracy and contrast of the projector 100.

[0072] After the light beam emitted by the third light emitting panel 10 c passes through the light combining device 20 , part of the light beam may be reflected to the first incident surface 21 a . The first filter 30 a can absorb this part of the light beam to reduce stray light in the projection light engine 100 .

[0073] In this embodiment, the first filter 30a absorbs the light beam emitted by the second light-emitting panel 10b and / or the third light-emitting panel 10c and refracted by the light-combining device 20 to illuminate the first incident surface 21a, so as to reduce the possibility of the light beam emitted by the second light-emitting panel 10b and / or the third light-emitting panel 10c forming stray light, thereby reducing the stray light in the projection light machine 100.

[0074] As mentioned above, the wavelength of the light beam emitted by the first light emitting panel 10a is greater than or equal to 600nm, the wavelength of the light beam emitted by the second light emitting panel 10b is less than or equal to 480nm, and the wavelength of the light beam emitted by the third light emitting panel 10c is greater than 480nm and less than 600nm.

[0075] For the visible light band greater than or equal to 600nm, the average transmittance of the first filter 30a is greater than or equal to 50%. For example, the average transmittance of the first filter 30a can be 50%, 65%, 70%, 74%, 79%, 82%, 85%, 90%, 95% or 100%. Under the premise that the average transmittance of the first filter 30a is greater than or equal to 50%, the greater the average transmittance of the first filter 30a for the visible light band greater than or equal to 600nm, the higher the energy of the light beam emitted by the first light-emitting panel 10a from the exit surface 22. This ensures that as much of the light beam emitted by the first light-emitting panel 10a as possible can pass through the first filter 30a, which is beneficial to improving the color accuracy and contrast of the projection light engine 100.

[0076] For the visible light band greater than or equal to 600nm, the average absorptivity of the first filter 30a is less than or equal to 50%. For example, the average absorptivity of the first filter 30a can be 50%, 35%, 30%, 26%, 21%, 18%, 15%, 10%, 5% or 0%. Under the premise that the average absorptivity of the first filter 30a is less than or equal to 50%, the smaller the average absorptivity of the first filter 30a for the visible light band greater than or equal to 600nm, the less the portion of the light beam emitted by the first light-emitting surface absorbed by the first filter 30a, so that the light beam emitted by the first light-emitting panel 10a will not be absorbed too much by the first filter 30a, thereby increasing the energy of the light beam of the first light-emitting panel 10a finally emitted from the exit surface 22, and improving the display effects such as color accuracy and contrast of the projection light machine 100.

[0077] It should be noted that the average transmittance referred to in this application is the average proportion of light within a specific range that passes through the corresponding optical filter 30. For example, for visible light wavelengths greater than or equal to 600 nm, the average proportion of light within this range that passes through the first optical filter 30a is greater than or equal to 50%. The average absorptivity is the average proportion of light within a specific range that is absorbed by the corresponding optical filter 30. For example, for visible light wavelengths greater than or equal to 600 nm, the average proportion of light within this range that is absorbed by the first optical filter 30a is less than or equal to 50%.

[0078] For the visible light band less than 600nm, the average transmittance of the first filter 30a is less than or equal to 30%. For example, the average transmittance of the first filter 30a can be 30%, 27%, 24%, 20%, 15%, 10%, 8%, 4%, or 0%, so that as little light beam as possible can pass through the first filter 30a after the light beams emitted by the second light-emitting panel 10b and the third light-emitting panel 10c are irradiated on the first incident surface 21a, thereby reducing the possibility of light beams from other light-emitting panels irradiating the first incident surface 21a forming stray light, thereby reducing the stray light in the projection light machine 100.

[0079] For the visible light band less than 600nm, the average absorption rate of the first filter 30a is greater than or equal to 70%. For example, the average absorption rate of the first filter 30a can be 70%, 73%, 76%, 80%, 85%, 90%, 92%, 96%, or 100%, so that the first filter 30a can absorb as much light as possible from other light-emitting panels irradiating the first filter 30a, reducing the possibility of light beams from other light-emitting panels irradiating the first incident surface 21a to form stray light, thereby reducing the stray light in the projection light machine 100.

[0080] The second filter 30b is used to pass the light beam emitted by the second light-emitting panel 10b. The part of the light beam emitted by the second light-emitting panel 10b that passes through the second filter 30b is combined with the light beams emitted by the first light-emitting panel 10a and the third light-emitting panel 10c to achieve full-color display of the projection light machine 100.

[0081] The second filter 30b can absorb light beams of a different color than that emitted by the second light-emitting panel 10b. For example, the second filter 30b absorbs the light beams emitted by the first light-emitting panel 10a and the third light-emitting panel 10c. Similarly, the first dichroic reflective surface 23 cannot achieve 100% reflectivity for the light beam emitted by the first light-emitting panel 10a. A portion of the light beam emitted by the first light-emitting panel 10a passes through the first dichroic reflective surface 23 and strikes the second incident surface 21b. The second filter 30b absorbs this portion of the light beam at the second incident surface 21b, thereby preventing stray light from forming in the entire projector 100 and improving the color accuracy and contrast of the projector 100.

[0082] Similarly, after the light beam emitted by the third light emitting panel 10 c passes through the light combining device 20 , part of the light beam may be reflected to the second incident surface 21 b . The second filter 30 b can absorb this part of the light beam to reduce stray light in the projection light engine 100 .

[0083] In this embodiment, the second filter 30b absorbs the light beams emitted by the first light-emitting panel 10a and / or the third light-emitting panel 10c and refracted by the light-combining device 20 to illuminate the second incident surface 21b, so as to reduce the possibility of the light beams emitted by the first light-emitting panel 10a and / or the third light-emitting panel 10c forming stray light, thereby reducing the stray light in the projection light machine 100.

[0084] For the visible light band less than or equal to 480nm, the average transmittance of the second filter 30b is greater than or equal to 50%. For example, the average transmittance of the second filter 30b can be 50%, 66%, 71%, 75%, 78%, 80%, 85%, 92%, 95% or 100%. Under the premise that the average transmittance of the second filter 30b is greater than or equal to 50%, the greater the average transmittance of the second filter 30b for the visible light band less than or equal to 480nm, the higher the energy of the light beam emitted by the second light-emitting panel 10b from the exit surface 22, thereby ensuring that as much of the light beam emitted by the second light-emitting panel 10b as possible can pass through the second filter 30b, which is beneficial to improving the color accuracy and contrast of the projection light machine 100.

[0085] For the visible light band less than or equal to 480nm, the average absorptivity of the second filter 30b is less than or equal to 50%. For example, the average absorptivity of the second filter 30b can be 50%, 34%, 29%, 25%, 22%, 20%, 15%, 8%, 5% or 0%. Under the premise that the average absorptivity of the second filter 30b is less than or equal to 50%, the smaller the average absorptivity of the second filter 30b for the visible light band less than or equal to 480nm, the less the portion of the light beam emitted by the second light-emitting surface absorbed by the second filter 30b, so that the light beam emitted by the second light-emitting panel 10b will not be absorbed too much by the second filter 30b, thereby increasing the light beam energy of the second light-emitting panel 10b finally emitted from the exit surface 22, and improving the display effects such as color accuracy and contrast of the projection light machine 100.

[0086] For the visible light band greater than 480nm, the average transmittance of the second filter 30b is less than or equal to 30%. For example, the average transmittance of the second filter 30b can be 30%, 28%, 25%, 20%, 16%, 11%, 7%, 3%, or 0%, so that as little light beam as possible can pass through the second filter 30b after the light beams emitted by the first light-emitting panel 10a and the third light-emitting panel 10c are irradiated on the second incident surface 21b, thereby reducing the possibility of light beams from other light-emitting panels irradiating the second incident surface 21b forming stray light, thereby reducing the stray light in the projection light machine 100.

[0087] For the visible light band greater than 480nm, the average absorption rate of the second filter 30b is greater than or equal to 70%. For example, the average absorption rate of the second filter 30b can be 70%, 72%, 75%, 80%, 84%, 89%, 93%, 97%, or 100%, so that the second filter 30b can absorb as much light as possible from other light-emitting panels irradiating the second filter 30b, reducing the possibility of light beams from other light-emitting panels irradiating the second incident surface 21b to form stray light, thereby reducing the stray light in the projection light machine 100.

[0088] The third filter 30c is used to pass the light beam emitted by the third light-emitting panel 10c. The part of the light beam emitted by the third light-emitting panel 10c that passes through the third filter 30c is combined with the light beams emitted by the first light-emitting panel 10a and the second light-emitting panel 10b to achieve full-color display of the projection light machine 100.

[0089] The third optical filter 30c can absorb light beams of a different color than that emitted by the third light-emitting panel 10c. For example, the third optical filter 30c absorbs light beams emitted by the first light-emitting panel 10a and the second light-emitting panel 10b. The first optical filter 30a and the second optical filter 30b cannot completely absorb the light beams emitted by the first light-emitting panel 10a and / or the second light-emitting panel 10b. Some of the light beams emitted by the first light-emitting panel 10a and / or the second light-emitting panel 10b can still be reflected by the first optical filter 30a and / or the second optical filter 30b to the third incident surface 21c, causing stray light in the projector 100.

[0090] In this embodiment, the third filter 30c is further used to absorb part of the light beam that the first filter 30a and / or the second filter 30b cannot absorb, thereby reducing the possibility of the light beam emitted by the first light-emitting panel 10a and / or the second light-emitting panel 10b forming stray light, thereby reducing the stray light in the projection light machine 100.

[0091] For the visible light band greater than 480nm and less than 600nm, the average transmittance of the third filter 30c is greater than or equal to 50%. For example, the average transmittance of the third filter 30c can be 50%, 64%, 70%, 73%, 76%, 80%, 84%, 90%, 96% or 100%. Under the premise that the average transmittance of the third filter 30c is greater than or equal to 50%, the greater the average transmittance of the third filter 30c for the visible light band greater than 480nm and less than 600nm, the higher the energy of the light beam emitted by the third light-emitting panel 10c from the exit surface 22, thereby ensuring that as much of the light beam emitted by the third light-emitting panel 10c as possible can pass through the third filter 30c, which is beneficial to improving the color accuracy and contrast of the projection light machine 100.

[0092] For the visible light band greater than 480nm and less than 600nm, the average absorptivity of the third filter 30c is less than or equal to 50%. For example, the average absorptivity of the third filter 30c can be 50%, 36%, 30%, 27%, 24%, 20%, 16%, 10%, 4% or 0%. Under the premise that the average absorptivity of the third filter 30c is less than or equal to 50%, the smaller the average absorptivity of the third filter 30c for the visible light band greater than 480nm and less than 600nm, the less the portion of the light beam emitted by the third light-emitting panel 10c absorbed by the third filter 30c, so that the light beam emitted by the third light-emitting panel 10c will not be absorbed too much by the third filter 30c, thereby increasing the light beam energy of the third light-emitting panel 10c finally emitted from the exit surface 22, and improving the display effects such as color accuracy and contrast of the projection light machine 100.

[0093] For the visible light band greater than or equal to 600nm and the visible light band less than or equal to 480nm, the average transmittance of the third filter 30c is less than or equal to 30%. For example, the average transmittance of the third filter 30c can be 30%, 26%, 23%, 20%, 14%, 12%, 10%, 5%, or 0%, so that as little light beam as possible can pass through the third filter 30c after the light beams emitted by the first light-emitting panel 10a and the second light-emitting panel 10b are irradiated on the third incident surface 21c, thereby reducing the possibility of light beams from other light-emitting panels irradiating the third incident surface 21c to form stray light, thereby reducing the stray light in the projection light machine 100.

[0094] For the visible light band greater than or equal to 600nm and the visible light band less than or equal to 480nm, the average absorption rate of the third filter 30c is greater than or equal to 70%. For example, the average absorption rate of the third filter 30c can be 70%, 74%, 77%, 80%, 86%, 88%, 90%, 95%, or 100%, so that the third filter 30c can absorb as much as possible the light beams irradiated by other light-emitting panels to the third filter 30c, reducing the possibility of stray light formed by light beams irradiated by other light-emitting panels to the third incident surface 21c, thereby reducing the stray light in the projection light machine 100.

[0095] Please refer to Figures 8a, 8b, and 8c. The projection light engine 100 includes a plurality of light-emitting units 10, a light-combining device 20, a plurality of filters 30 corresponding one-to-one to the plurality of light-emitting units 10, a plurality of lens arrays 50 corresponding one-to-one to the plurality of light-emitting units 10, and a lens 40. The arrangement of the plurality of light-emitting units 10, the light-combining device 20, the plurality of filters 30 corresponding one-to-one to the plurality of light-emitting units 10, the plurality of filters 30 corresponding one-to-one to the plurality of light-emitting units 10, and the lens 40 is the same as the specific arrangement of the corresponding components in the projection light engine 100 shown in Figures 6 or 7. The difference is that a lens array 50 is correspondingly arranged between the light-emitting unit 10 and the incident surface 21. The lens array 50 is used to reduce the divergence angle of the light beam emitted by the corresponding light-emitting unit 10, so that the reflectivity of the light beam irradiated into the light-combining device 20 is higher, which is beneficial to improving the display effect of the projection light engine 100.

[0096] In one embodiment, as shown in Figure 8a, the filter 30 is attached to the corresponding incident surface 21, and the lens array 50 is attached to the surface of the light-emitting unit 10 facing the filter 30. For example, the second filter 30b is attached to the second incident surface 21b, and the lens array 50 is attached to the surface of the second light-emitting panel 10b facing the second filter 30b. After the light beam emitted by the second light-emitting panel 10b passes through the lens array 50, the divergence angle of the light beam is reduced, so that the reflectivity of the light beam when it is irradiated on the second dichroic reflective surface 24 is higher, reducing the portion of the light beam passing through the second dichroic reflective surface 24, which is beneficial to improving the display effects such as color accuracy and contrast of the projection light machine 100.

[0097] In another embodiment, as shown in Figure 8b, the filter 30 is attached to the corresponding incident surface 21, and the lens array 50 replaces the cover 13 of the light-emitting unit 10. The active light-emitting device 12 on the substrate 11 is directly encapsulated through the lens array 50 as the cover 13 of the light-emitting unit 10, so that the light beam emitted by the light-emitting unit 10 reduces the divergence angle through the lens array 50, and improves the reflectivity of the light beam in the light combining device 20. At the same time, the overall volume of the projection light machine 100 can also be reduced, which is conducive to achieving a small volume of the projection light machine 100.

[0098] In another embodiment, as shown in FIG8 c , the filter 30 serves as the cover 13 of the light emitting unit 10 and covers the substrate 11 of the light emitting unit 10 , and the lens array 50 is attached to the surface of the filter 30 facing the incident surface 21 .

[0099] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0100] The first, second and various numerical numbers involved in this document are only for the convenience of description and are not intended to limit the scope of this application.

[0101] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0102] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A projection optical machine, characterized in that: include: A plurality of light-emitting units are used to emit light beams of different colors respectively; A light combining device, comprising a plurality of incident surfaces, each of the incident surfaces being arranged opposite to a corresponding one of the light emitting units, and the light combining device being used to combine the light beams emitted by the plurality of light emitting units and then emit the light beams; A plurality of filters corresponding to the plurality of light-emitting units one by one, each of the filters being located between the corresponding light-emitting unit and the corresponding incident surface, and the filters being used to transmit the light beam emitted by the corresponding light-emitting unit and absorb the light beams emitted by other light-emitting units.

2. The projection optical machine according to claim 1, characterized in that: The optical filter is attached to the corresponding incident surface.

3. The projection optical machine according to claim 1 or 2, characterized in that: The light-emitting unit includes a substrate and color pixels, the color pixels are arranged on the substrate, and the color pixels include active light-emitting components; the filter component covers the substrate of the corresponding light-emitting unit, and the active light-emitting component is located between the substrate and the filter.

4. The projection optical machine according to any one of claims 1 to 3, characterized in that: Along the arrangement direction of the optical filter and the light-emitting unit, two opposite surfaces of the optical filter are both planes.

5. The projection optical machine according to any one of claims 1 to 4, characterized in that: The plurality of light-emitting units include a first light-emitting panel, a second light-emitting panel, and a third light-emitting panel, the colors of the light beams emitted by the first light-emitting panel, the second light-emitting panel, and the third light-emitting panel are different, the plurality of filters include a first filter, a second filter, and a third filter, and the plurality of incident surfaces include a first incident surface, a second incident surface, and a third incident surface; The first filter is disposed between the first light-emitting panel and the first incident surface; the first filter is used to transmit the light beam emitted by the first light-emitting panel and absorb the light beams emitted by the second light-emitting panel and the third light-emitting panel; The second filter is disposed between the second light-emitting panel and the second incident surface, and is used for transmitting the light beam emitted by the second light-emitting panel and absorbing the light beams emitted by the first light-emitting panel and the third light-emitting panel; The third filter is disposed between the third light emitting panel and the third incident surface, and is used for transmitting the light beam emitted by the third light emitting panel and absorbing the light beams emitted by the first light emitting panel and the second light emitting panel.

6. The projection optical machine according to claim 5, characterized in that: The wavelength band of the light beam emitted by the first light-emitting panel is greater than or equal to 600nm, and the wavelength band of the light beam emitted by the second light-emitting panel and the third light-emitting panel is less than 600nm; for the visible light band greater than or equal to 600nm, the average transmittance of the first filter is greater than or equal to 50%, and the average absorptivity of the first filter is less than or equal to 50%; for the visible light band less than 600nm, the average transmittance of the first filter is less than or equal to 30%, and the average absorptivity of the first filter is greater than or equal to 70%.

7. The projection optical machine according to claim 5 or 6, characterized in that: The wavelength band of the light beam emitted by the second light-emitting panel is less than or equal to 480nm, and the wavelength band of the light beam emitted by the first light-emitting panel and the third light-emitting panel is greater than 480nm; for the visible light band less than or equal to 480nm, the average transmittance of the second filter is greater than or equal to 50%, and the average absorptivity of the second filter is less than or equal to 50%; for the visible light band greater than 480nm, the average transmittance of the second filter is less than or equal to 30%, and the average absorptivity of the second filter is greater than or equal to 70%.

8. The projection optical machine according to any one of claims 5 to 7, characterized in that: The wavelength band of the light beam emitted by the third light-emitting panel is greater than 480nm and less than 600nm, the wavelength band of the light beam emitted by the first light-emitting panel is greater than or equal to 600nm, and the wavelength band of the light beam emitted by the second light-emitting panel is less than or equal to 480nm; for the visible light band greater than 480nm and less than 600nm, the average transmittance of the third filter is greater than or equal to 50%, and the average absorptivity of the third filter is less than or equal to 50%; for the visible light band greater than or equal to 600nm and the visible light band less than or equal to 480nm, the average transmittance of the third filter is less than or equal to 30%, and the average absorptivity of the third filter is greater than or equal to 70%.

9. The projection optical machine according to any one of claims 5 to 8, characterized in that: The light combining device includes an exit surface, and a first dichroic emitting surface and a second dichroic reflecting surface arranged crosswise, wherein the first dichroic emitting surface and the second dichroic reflecting surface are located in a space surrounded by the exit surface and the plurality of incident surfaces, the light beam emitted by the first light-emitting panel is reflected by the first incident surface and the first dichroic reflecting surface and then emitted from the exit surface; the light beam emitted by the second self-luminous panel is reflected by the second incident surface and the second dichroic reflecting surface and then emitted from the exit surface; the light beam emitted by the third light-emitting panel is emitted from the exit surface via the third incident surface, the first dichroic reflecting surface and the second dichroic reflecting surface.

10. The projection optical machine according to claim 9, characterized in that: The first incident surface is opposite to and parallel to the second incident surface, the third incident surface is opposite to and parallel to the exit surface, the first incident surface is perpendicular to the third incident surface, the first incident surface intersects with the first dichroic reflection surface, and the first incident surface intersects with the first dichroic reflection surface.

11. The projection optical machine according to any one of claims 1 to 10, characterized in that: The projection light engine also includes a plurality of lens arrays corresponding one-to-one to the plurality of light-emitting units, each of the lens arrays is arranged between the light-emitting unit and the incident surface, and the lens array is used to reduce the divergence angle of the light beam emitted by the corresponding light-emitting unit.

12. An electronic device, characterized in that: It comprises a main board and a projection light engine as described in any one of claims 1 to 10, wherein the projection light engine is arranged on the main board.

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