Light engine system and projection device

Abstract

The application provides a light engine system, which comprises a light source, a polarization beam splitter and a light combining element. The light source comprises a red light emitting element, a green light emitting element and a blue light emitting element. The red light emitting element is used for exciting red light, the green light emitting element is used for exciting green light, and the blue light emitting element is used for exciting blue light. The polarization beam splitter is used for receiving the blue light emitted by the blue light emitting element and splitting the blue light into first polarized light and second polarized light. The second polarized light is guided to the red light emitting element or the green light emitting element to excite part of the red light or part of the green light. The light combining element is used for combining the red light, the green light and the first polarized light and then emitting the combined light. In the application, the blue light is split into different polarization states, so that part of the blue light in the polarization state forms part of other color light, the utilization rate of the blue light is improved, and the light energy loss is reduced. In addition, the application further provides a projection device.

Description

Technical Field

[0001] This application relates to the field of optical technology, specifically to a light engine system and projection device. Background Technology

[0002] In recent years, single-chip color LCD projection systems have emerged, which can solve the "rainbow effect" problem of single-chip light valve projection systems in principle. Due to their widespread use in display fields such as televisions, computer monitors and mobile phone screens in recent decades, their cost is significantly reduced compared to three-chip light valve projection systems. However, they still have problems such as serious light loss, poor light efficiency, large product size, and still high production costs. Summary of the Invention

[0003] The purpose of this application is to provide a light engine system and projection device to solve the above-mentioned technical problems.

[0004] In a first aspect, embodiments of this application provide a light engine system, including a light source, a polarization beam splitter, and a beam combiner. The light source includes a red light-emitting element, a green light-emitting element, and a blue light-emitting element. The red light-emitting element is used to generate red light, the green light-emitting element is used to generate green light, and the blue light-emitting element is used to generate blue light. The polarization beam splitter is used to receive the blue light emitted by the blue light-emitting element and split the blue light into a first polarized light and a second polarized light. The second polarized light is guided to the red light-emitting element or the green light-emitting element to generate a portion of red light or a portion of green light. The beam combiner is used to combine the red light, green light, and the first polarized light before emission.

[0005] In some embodiments of this application, the light engine system further includes a reflector, which is disposed in the optical path of the second polarized light and is used to guide the second polarized light to the red light-emitting component or the green light-emitting component, and also to guide the red light or green light to the light combining element.

[0006] In some embodiments of this application, each of the red light-emitting element and the green light-emitting component includes a light source and a phosphor. The second polarized light guided by the mirror and the excitation light emitted from the light source are incident on the phosphor in different directions and are excited to form red or green light corresponding to the phosphor. The red or green light formed by the excitation is guided to the light combining element through the mirror.

[0007] In some embodiments of this application, the light engine system further includes a light collection device for collecting blue light, red light, or green light and emitting it.

[0008] In some embodiments of this application, the light collection device includes a homogenizer and a lens. The homogenizer is used to homogenize blue light, red light, or green light, and the lens is used to guide the homogenized light beam outward.

[0009] In some embodiments of this application, the light engine system further includes a first optical path component, a second optical path component, and a third optical path component. The first optical path component is used to guide red light to the light combining element, the second optical path component is used to guide green light to the light combining element, and the third optical path component is used to guide first polarized light to the light combining element.

[0010] In some embodiments of this application, the first optical path assembly includes a first prism, which is used to collect red light emitted from the light collection device and guide the red light to the light combining element. The third optical path assembly includes a first light guide and a second light guide. The first light guide is disposed between the polarization beam splitter and the light combining element and is used to guide the first polarized light to the light combining element. The second light guide is used to receive the second polarized light emitted from the polarization beam splitter and guide it toward the green light-emitting element or the red light-emitting element.

[0011] In some embodiments of this application, the optical spread of the emitted light from the first optical path component, the second optical path component, and the third optical path component is the same as the optical spread of the emitted light from the corresponding light collection device.

[0012] In some embodiments of this application, the first optical path component, the second optical path component, and the third optical path component all further include: a polarizing device and a panel. The polarizing device is used to receive red light or green light or first polarized light, and after polarization, it is emitted to the panel. The panel is disposed between the polarizing device and the light combining element.

[0013] In some embodiments of this application, each panel has an incident light measuring lens. In some embodiments of this application,

[0014] Secondly, embodiments of this application also provide a projection device, including the aforementioned light engine system and a projection lens, wherein the light emitted from the light combining element is projected outward through the projection lens.

[0015] The light engine system of this application uses polarization beam splitters and beam combiners to split blue light into different polarization states, so that some polarized blue light forms some other colors of light, which improves the utilization rate of blue light, reduces light energy loss, and lowers production costs. At the same time, compared with the traditional three-panel light valve projection system, the projection device of this application has advantages such as simple optical path structure, small product size, low assembly precision, and good brightness uniformity. In addition, compared with the single-panel color LCD projection system, its light utilization rate is significantly improved.

[0016] These or other aspects of this application will become more apparent in the following description of the embodiments. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0019] Figure 2 This is a schematic diagram of the optical path of the projection device provided in the first embodiment of this application.

[0020] Figure 3 This is a schematic diagram of the structure of another projection device provided in the first embodiment of this application.

[0021] Figure 4 This is a schematic diagram of the structure of another projection device provided in the second embodiment of this application. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention 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 therefore should not be construed as a limitation of this invention.

[0025] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0026] An electronic projection display system mainly consists of a lighting system, an optical engine system, a projection lens, and a projection screen. The spatial light modulator (SLM), also known as a "light valve," is a crucial component in the optical engine system. A light valve is typically a pixelated planar device where each pixel can independently control the incident illumination light through transmission or reflection, thereby controlling the luminous flux of each pixel to form a displayed image. In the display system, the core principle of display is based on the red, green, and blue primary color display principle. The light valve needs to display the image information of red, green, and blue primary colors separately, and then combine the three monochrome images through time integration or spatial integration, allowing the human eye to perceive a single color image.

[0027] A single-chip light valve projection system is a common type of projection system. It uses only a single light valve device and processes only the light intensity, not the color. Common single-chip light valve projection systems include Digital Light Processing (DLP) projection systems and Liquid Crystal on Silicon (LCoS) projection systems. The image display principle of a single-chip light valve projection system is as follows: at time t1, red light is shone on the light valve, and the light valve transmits or reflects a red image; at time t2, green light is shone on the light valve, displaying a green image; at time t3, blue light is shone on the light valve, displaying a blue image. When the switching speed between the three times t1, t2, and t3 is fast enough, thanks to the persistence of vision in the human eye, the observer's eye will mix the three monochrome images into a single color image, thus achieving color display. Single-chip light valve projection systems have the advantages of simple structure and small system size, but they suffer from the "rainbow effect." The rainbow effect occurs when there is a speed difference between the displayed image and the observer, resulting in a rainbow-like pattern observed at the boundary between two colors. Furthermore, if a white light source is used, since only one monochromatic light source (red, green, or blue) can be used at any given time—meaning that when displaying a red image, green and blue must be filtered out—the optical efficiency of the projection system will be low.

[0028] Three-panel light valve projection systems include: three-panel liquid crystal displays (LCDs), three-panel digital micromirror devices (DMDs), and three-panel LCoS projection display solutions. Among these, the three-panel LCD light valve projection system is more commonly used. Its image display principle is as follows: white light source passes through a homogenizing device, then a polarization converter to obtain a linearly polarized light source, which is then separated into colors by a dichroic mirror. The blue light path is reflected by the dichroic mirror and a reflector onto the corresponding LCD panel. The LCD panel performs pixel-level control on the polarization state of the illumination light, and then passes through a polarizer to form a blue image. Similarly, the separated green and red light also sequentially illuminate their respective LCD panels, producing green and red images respectively. The three monochromatic images of red, green, and blue formed simultaneously are combined by a light combining device to form a single-color image, which is then projected onto the screen. The three-piece light valve projection system solves the "rainbow effect" problem of the single-piece light valve projection system in principle, but its optical path system is complex, hardware costs are high, and the system size is large. In addition, since the display of a single-color image requires the combination of three monochrome images, the system architecture has very high requirements for the brightness uniformity of each of the three light valves and the assembly precision between them (the alignment precision at the pixel size level is usually less than 10um), which further increases the production cost.

[0029] In recent years, single-panel color LCD projection systems have emerged, utilizing liquid crystal displays for image formation. The image display principle of a single-panel color LCD projection system is as follows: when white light is incident on a color LCD panel, it first passes through a polarizer to form polarized light, then sequentially passes through transparent electrodes, a liquid crystal layer, and an alignment film. The light, controlled by pixelated liquid crystals, finally passes through a color filter layer and is detected by the polarizer. Adjacent color filters are for red, green, and blue, respectively. Therefore, the color LCD panel can not only control the light intensity but also the color of the pixels, forming an arrangement of adjacent red, green, and blue sub-pixels. Although the three color pixels are spatially separated, due to the limited angular resolution of the human eye, at a certain distance, the observer cannot distinguish the three separate color pixels. Instead, they treat each group of red, green, and blue sub-pixels as a single display unit, observing a color display image formed by spatial integration. Single-chip color LCD projection systems can also solve the "rainbow effect" problem of single-chip light valve projection systems in principle. Moreover, due to their widespread use in display fields such as televisions, computer monitors, and mobile phone screens in recent decades, their cost is significantly lower than that of three-chip light valve projection systems.

[0030] However, since the color filter film only allows light of a specific color to pass through, all other wavelengths of light will be absorbed. Using white light source illumination will cause more than 60% of light energy to be lost. At the same time, the absorbed light will be converted into heat, which will raise the temperature of the color LCD panel and further affect the display effect and the life of the display chip.

[0031] Furthermore, LCD panels are manufactured using two methods: Low Temperature Poly-Silicon (LTPS) and High Temperature Poly-Silicon (HTPS). LTPS technology has lower cost but lower precision and larger pixel sizes (typically above 25µm). For a given resolution, this results in a larger overall LCD panel size, a larger lens size, and ultimately a larger projection system. HTPS technology offers higher precision, allowing for pixel sizes below 10µm, but it requires more advanced manufacturing processes and is more expensive.

[0032] Furthermore, since the color pixels on a color LCD panel are separate from each other, although in television, computer monitors, or mobile phone screens, the observer cannot distinguish the spatial color separation due to the limitations of human eye resolution and viewing distance, in projection displays, since the size of the projection is usually much larger than that of the physical display screen, the phenomenon of color pixel separation becomes more obvious, affecting the viewing experience.

[0033] Meanwhile, because LCD panels contain matrix conductive electrodes (TFT circuits) that drive the liquid crystals of individual pixels, these circuits are often made of opaque materials, which can block incident light at corresponding locations, resulting in some light efficiency loss. Furthermore, some light energy is absorbed by the TFT circuits and converted into heat. Due to the presence of TFT circuits and manufacturing limitations, LCD panel sizes are relatively large to ensure the panel's aperture ratio (i.e., its light transmittance), leading to larger projection system sizes and volumes. In addition, color LCD panels use a set of three pixels (red, green, and blue) equivalent to one color pixel, reducing the panel's resolution to about one-third of its intrinsic resolution.

[0034] Therefore, the inventors of this application have proposed projection devices and projection apparatuses as described in the embodiments of this application. The various embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0035] First Embodiment

[0036] Please refer to Figure 1This application provides a projection device 10, including a light engine system 30 and a projection lens group 20. The light engine system 30 emits modulated light, which is emitted through the projection lens group 20. The light engine system 30 includes a light source, a polarizing beam splitter 200, and a beam combiner 300.

[0037] Please refer to Figure 1 The light source includes a red light-emitting element 110, a green light-emitting element 120, and a blue light-emitting element 130. The light sources for the red, green, and blue light-emitting elements 110 and 120 can be LED light sources or laser phosphor light sources. For example, the red light-emitting element 110 may include a light source and red phosphor; the green light-emitting element 120 may include a light source and green phosphor; and the blue light-emitting element 130 may include a light source and blue phosphor. The phosphor emits light of the corresponding color—red, green, and blue—by exciting the phosphor with an LED light source or a laser phosphor light source. In some embodiments, the red, green, and blue light-emitting elements 110, 120, and 130 can all be integrated onto the same substrate to save costs.

[0038] The polarization beam splitter 200 receives blue light emitted from the blue light-emitting element 130 and splits it into a first polarized light and a second polarized light. The first polarized light can be either P-component blue light or S-component blue light; correspondingly, it can be either S-component blue light or P-component blue light, without limitation. The first polarized light is guided to the beam combiner 300, and the second polarized light is guided to the red or green light-emitting component to excite and generate a portion of red light or a portion of green light. It is understood that the first and second polarized light, after being separated by the polarization beam splitter 200, are emitted along different optical paths.

[0039] In this embodiment, as an example only, after the polarization beam splitter 200 splits blue light into first polarized light and second polarized light, the emission directions of the first polarized light and the second polarized light are approximately perpendicular to each other. In other embodiments, the emission directions of the first polarized light and the second polarized light may be at other angles. Furthermore, in this embodiment, the polarization beam splitter 200 is a PBS prism. It is understood that in other embodiments, the polarization beam splitter 200 may also be constructed in other forms.

[0040] In this embodiment, as an example, the second polarized light is guided to the green light-emitting element 120 to generate a portion of green light, thereby improving the utilization rate of blue light. The light-combining element 300 is used to combine the red light, green light, and the first polarized light before emission, wherein the green light includes the green light emitted by the green light-emitting element 120 and the green light generated by the second polarized light.

[0041] As described above, the green light-emitting element 120 includes a light source and green phosphor. The green phosphor can be carried on a color wheel coated with green phosphor. When the second polarized light is guided to the green light-emitting element 120, it is directly guided to the color wheel and excites the green phosphor to form green light. To improve the excitation efficiency of green light, the excitation light emitted from the light source and the second polarized light can be incident on the green phosphor in two different directions to excite and form green light, which is equivalent to double-sided excitation to form green light. As one embodiment, the excitation light emitted from the light source and the second polarized light can be incident on the green phosphor in opposite directions to form green light, which is then guided to the light combining element 300 for emission.

[0042] In this embodiment, the light engine system 30 further includes a reflector 521, which is disposed in the optical path of the second polarized light to guide the second polarized light to the green light-emitting component, thereby exciting and forming a portion of the green light. The excitation light emitted from the light source and the green light excited by the second polarized light are guided to the light combining element 300 via the reflector 521. As an example, in this embodiment, the reflector 521 can transmit green light and reflect blue light. Thus, when the second polarized light is incident on the reflector 521, the blue light is reflected towards the green light-emitting component, thereby exciting the green phosphor to form green light. The formed green light then passes through the reflector 521 and is emitted to the light combining element 300. As another example, in other embodiments, the transflector 521 can transmit blue light and reflect green light. Thus, when the second polarized light is incident on the transflector 521, the blue light passes through the transflector 521 and exits towards the green light-emitting component, thereby exciting the green phosphor to form green light. The formed green light is incident on the transflector 521 and reflected by the transflector 521 to the light-combining element 300. The red light, the first polarized light, and the green light emitted from the red light-emitting element 110 are combined at the light-combining element 300 and then emitted.

[0043] By setting up the reflective mirror 521, the second polarized light and the green light can have partially the same optical path during propagation, which helps to further reduce the size of the entire light engine system 30. Of course, it is understood that in some other embodiments, the reflective mirror 521 may not be set up, in which case the second polarized light and the green light can propagate through completely different optical paths, which is also feasible.

[0044] In this embodiment, the light engine system 30 further includes an optional light collection device 400, and the number of light collection devices 400 is three. The three light collection devices 400 are respectively disposed between the blue light-emitting element 130 and the polarization beam splitter 200, between the red light-emitting element 110 and the first optical path component 510, and between the green light-emitting element 120 and the second optical path component 520.

[0045] One of the light-collecting devices 400 is used to collect and homogenize the blue light emitted from the blue light-emitting element 130, and guide the blue light to the polarization beam splitter 200. After passing through the light-collecting device 400, the optical spread of the blue light is adjusted to a better size, which is beneficial for having a more suitable optical spread after being split into first polarized light and second polarized light. One of the light-collecting devices 400 is used to collect and homogenize the red light emitted from the red light-emitting element 110, and guide the red light to the beam combining element 300. The remaining light-collecting device 400 is used to collect and homogenize the green light emitted from the green light-emitting element 120, and guide the green light to the reflector 521 and then to the beam combining element 300. Finally, the first polarized light, green light and red light are combined at the beam combining element 300 and then emitted.

[0046] The light collecting device 400 includes a homogenizer 410 and a lens 420. The homogenizer 410 is used to homogenize blue light, and the lens 420 is used to guide the homogenized blue light to the polarization beam splitter 200. The lens 420 can be a convex lens. In this embodiment, the light collecting device 400 disposed between the blue light-emitting element 130 and the polarization beam splitter 200 is described as an example. The homogenizer 410 can appropriately increase the optical spread of blue light. After being homogenized by the homogenizer 410, the blue light enters the polarization beam splitter 200 through the lens 420. Similarly, in the light collecting device 400 disposed on the red light-emitting element 110, the homogenizer 410 can appropriately increase the optical spread of red light. After being homogenized by the homogenizer 410, the red light enters the beam combining element 300 through the lens 420. The light collection device 400 is installed on the green light-emitting element 120. The light homogenizer 410 can appropriately increase the optical expansion of the green light. After being homogenized by the light homogenizer 410, the green light enters the transflector 521 through the lens 420 and is then guided to the light combining element 300.

[0047] In some embodiments, the blue, red, and green light emitted from the light collecting device 400 have the same optical spread, which makes the beam after being combined by the light combining element 300 more uniform. In addition, the red, green, and first polarized light can be incident on the light combining element 300 in the same or different directions, which is not limited here.

[0048] To guide the first polarized light, red light, and green light to the light combining element 300 along a predetermined optical path, and to minimize the overall system size, the optical engine system 30 may further include optional first optical path component 510, second optical path component 520, and third optical path component 530. The first optical path component 510 guides red light to form a red light path, the second optical path component 520 guides green light to form a green light path, and the third optical path component 530 guides blue light to form a blue light path. The first optical path component 510, second optical path component 520, and third optical path component 530 may include, for example, mirrors, lenses, prisms, or other optical elements, without limitation herein.

[0049] As an example, in this embodiment, the first optical path component 510 includes a first prism 511. The first prism 511 is used to collect red light emitted from the light collection device 400 and guide the red light to the light combining element 300. The first prism 511 can deflect the propagation direction of the red light. For example, the first prism 511 is a right-angle prism with a 45° reflective surface, which can deflect the propagation direction of the red light by 90°. Due to the reflective surface of the first prism 511, the optical expansion of the red light after reflection by the first prism 511 does not change, thus maintaining the optical waveguide. It is understood that the first optical path component 510 can also be other components or may include other components, such as a hollow light guide tube, a reflector, etc.

[0050] In this embodiment, the reflective mirror 521 not only guides the second polarized light but also guides the green light to the light combining element 300. Therefore, the reflective mirror 521 can serve as a component of the second optical path assembly 520 or as a part of the second optical path assembly 520. The reflective surface of the reflective mirror 521 can also be set at 45°, so that both the green light and the second polarized light can maintain their optical waveguides and the optical spread remains unchanged when passing through the reflective mirror 521. It is understood that in some other embodiments, the second optical path assembly 520 may also include a light guide tube, a reflector, etc.

[0051] The third optical path assembly 530 may include a first light guide 531 and a second light guide 532. The first light guide 531 is disposed between the polarization beam splitter 200 and the beam combiner 300 and is used to guide the first polarized light to the beam combiner 300. The second light guide 532 is used to receive the second polarized light emitted from the polarization beam splitter 200 and is located between the polarization beam splitter 200 and the mirror 521. It is used to guide the second polarized light toward the mirror 521 and then toward the green light-emitting element 120. Both the first light guide 531 and the second light guide 532 may be hollow light guide tubes, which do not change the optical spread of the light emitted from the light collecting device 400.

[0052] That is, when the optical spread of the emitted light from the first optical path component 510, the second optical path component 520, and the third optical path component 530 is the same as the optical spread of the emitted light from the corresponding light collection device 400,

[0053] In some embodiments, the third optical path assembly 530 may further include a second prism 533, which is disposed between the first light guide 531 and the light combining element 300 to deflect the first polarized light emitted from the first light guide 531 so that the first polarized light is emitted toward the light combining element 300. The second prism may be a right-angle prism with a 45° reflective surface, which can deflect the propagation direction of red light by 90°. Due to the reflective surface of the second prism 533, the optical expansion of the red light after reflection by the second prism 533 remains unchanged, thus maintaining the optical waveguide. It is understood that the third optical path assembly 530 may also be other components or may include other components, such as a hollow light guide tube, a reflector, etc.

[0054] In one embodiment, the first optical path component 510, the second optical path component 520, and the third optical path component 530 may each further include a polarizing device 340 and a panel 350. For the red light path, the red light emitted from the red light-emitting element 110, after being incident on the polarizing device 340, forms selectively polarized red light. This red polarized light then enters the light combining element 300 after being incident on the panel 350. For the green light path, green light, after passing through the reflector 521, enters the polarizing device 340, forming selectively polarized green light. This green polarized light then enters the light combining element 300 after being incident on the panel 350. Simultaneously, the first polarized light passes through the polarizing device 340 and the panel 350 before entering the light combining element 300. The polarization states of red and green light after passing through the polarization device 340 can be the same as those of the first polarized light. Thus, after passing through the light combining element 300, the resulting combined beam has only one polarization state, which is beneficial for subsequent 3D projection. Of course, it is also feasible not to set up the polarization device 340.

[0055] The polarizing device 340 may include a polarizer 341 and an analyzer 342, with the polarizer 341 positioned before the analyzer 342. The polarizer 341 and analyzer 342 together cause the light beam to form polarized light with a specific polarization state. Specifically, for blue light, since the polarization beam splitter 200 has already formed first polarized light with a specific polarization state, the polarizing device 340 in the blue light path may only require the analyzer 342. The panel 350 may be a transparent LCD panel 350, used to guide the light beam to the beam combining element 300. The panel 350 is positioned between the polarizing device 340 and the beam combining element 300. A field lens may also be provided on the light-incident side of any one or more panels 350. This field lens converges the main rays incident on the panel 350 at different angles of incidence, which helps reduce the design difficulty and cost of the lens, while also reducing the lens size. The field lens may be a Fresnel lens 420 or a convex lens 420.

[0056] Furthermore, in some embodiments, the polarizing device 340 may also include a reflective polarizer, which can reflect unwanted polarized light and return it to the light source to re-participate in the light cycle, further improving the utilization rate of the light beam.

[0057] See Figure 2 The working principle of the light engine system 30 in this embodiment is as follows:

[0058] For blue light: The blue light emitted by the blue light-emitting element is first collected by the light-collecting device 400 and then emitted towards the polarization beam splitter 200. The polarization beam splitter 200 splits the blue light into a first polarized light P1 and a second polarized light P2. The first polarized light P1 is guided to the light combining element 300 via the first light guide tube and the second prism 533 of the third optical path component 530. During this process, the optical spread remains unchanged. The second polarized light P2 is guided to the transmission mirror 521 via the second light guide 532. The transmission mirror 521 reflects the second polarized light P2 towards the green light-emitting component, exciting and forming a portion of green light.

[0059] For green light, the green light generated by the excitation light emitted from the green light-emitting component and the green light generated by the second polarized light P2 are emitted towards the reflector 521 after passing through the light collection device 400. After passing through the reflector 521, they pass sequentially through the polarizing device 340 and the panel 350, and then exit to the light combining element 300. For red light, the red light emitted from the red light-emitting component is deflected by the first prism 511 of the first optical path component 510 after passing through the light collection device 400, and then exits towards the light combining element 300. The light combining element 300 combines the red light, green light, and the first polarized light P1 before exiting the light.

[0060] In the red light path and the green light path, the location of the polarization device 340 is not limited, and in some embodiments, the polarization device 340 may not be provided.

[0061] Please continue to refer to Figure 1 The projection lens group 20 is used to project the light modulated by the light engine system 30 outward to form an image. Figure 1 In one example shown, the projection lens group 20 includes an imaging lens 21 and an imaging lens 22. Imaging lenses 21 and 22 are used for projection display, magnifying and projecting the image obtained after light combining processing by the light combining element 300. An imaging lens can consist of one or more lenses. The imaging lens in this embodiment can also be referred to as a projection lens. As one implementation method, the imaging lens can be arranged in the form of a mobile phone architecture, placing the aperture stop on the outermost side, thereby achieving lens miniaturization and cost reduction, further reducing the overall product size.

[0062] Please refer to Figure 3 As shown in one example, the projection device 10 may also include a beam deflection device 40. The light emitted after being combined by the light combining element 300 enters the beam deflection device 40, which can achieve pixel expansion, improve pattern display effects, and enhance the viewing experience. The beam deflection device 40 can be an XPR or E-SHIFT device. For XPR devices, the polarization state of the light is not critical, so the polarization device 340 may not be required in the projection device 10. For E-SHIFT devices, the blue, red, and green light incident on the light combining element 300 can have the same polarization state, further improving the display effect.

[0063] Second Embodiment

[0064] See Figure 4 This embodiment provides a projection device 10, which differs from the first embodiment in that, in this embodiment, after the blue light is split by the polarization beam splitter 200, the second polarized light is guided to the red light-emitting element 110 to excite a portion of the red light.

[0065] The reflector 521 is configured to transmit red light and reflect blue light, or to transmit blue light and reflect red light, so that the second polarized light can be guided to the red light-emitting element 110 to generate some red light.

[0066] Other settings or structures are the same as in the first embodiment, and can be found in the relevant content of the first embodiment, which will not be repeated here.

[0067] The above description is only a partial embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A light engine system, characterized in that, include: The light source includes a red light-emitting element, a green light-emitting element, and a blue light-emitting element, wherein the red light-emitting element is used to generate red light, the green light-emitting element is used to generate green light, and the blue light-emitting element is used to generate blue light; A polarization beam splitter is used to receive blue light emitted by the blue light-emitting element and split the blue light into first polarized light and second polarized light; each of the red light-emitting element and the green light-emitting element includes a light source and a phosphor; the second polarized light is guided to the red light-emitting element or the green light-emitting element; the second polarized light and the excitation light emitted from the light source are incident on the phosphor in different directions to excite and generate part of the red light or part of the green light; A light combining element is used to combine the red light, the green light, and the first polarized light before emission.

2. The light engine system according to claim 1, characterized in that, The light engine system further includes a reflector, which is disposed in the optical path of the second polarized light and is used to guide the second polarized light to the red light-emitting element or the green light-emitting element, and also to guide the red light or the green light to the light-combining element.

3. The light engine system according to claim 1, characterized in that, The light engine system also includes a light collection device for collecting blue light, red light, or green light and then emitting it.

4. The light engine system according to claim 3, characterized in that, The light collection device includes a homogenizer and a lens. The homogenizer is used to homogenize blue light, red light, or green light, and the lens is used to guide the homogenized light beam outward.

5. The light engine system according to claim 3, characterized in that, The light engine system further includes a first optical path component, a second optical path component, and a third optical path component. The first optical path component is used to guide red light to the light combining element, the second optical path component is used to guide green light to the light combining element, and the third optical path component is used to guide the first polarized light to the light combining element.

6. The light engine system according to claim 5, characterized in that, The first optical path assembly includes a first prism, which is used to guide the red light emitted by the light collecting device to the light combining element. The third optical path assembly includes a first light guide and a second light guide. The first light guide is disposed between the polarization beam splitter and the light combining element and is used to guide the first polarized light to the light combining element. The second light guide is used to receive the second polarized light emitted from the polarization beam splitter and guide it toward the green light-emitting element or the red light-emitting element.

7. The light engine system according to claim 6, characterized in that, The optical spread of the emitted light from the first optical path component, the second optical path component, and the third optical path component is the same as the optical spread of the emitted light from the corresponding light collection device.

8. The light engine system according to claim 6, characterized in that, The first optical path component, the second optical path component, and the third optical path component all further include: a polarizing device and a panel. The polarizing device is used to receive the red light or the green light or the first polarized light, and after polarization, it is emitted to the panel. The panel is disposed between the polarizing device and the light combining element.

9. The light engine system according to claim 8, characterized in that, Each of the aforementioned panels has an incident light measuring lens.

10. A projection device, characterized in that, The system includes a light engine system as described in any one of claims 1-9 and a projection lens, wherein the light emitted from the light combining element is projected outward through the projection lens.

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