A projection device

Abstract

This application provides a projection device, including a hybrid light source for emitting hybrid light, the hybrid light including laser light and LED light; a first aperture disposed in the light output path of the hybrid light source; a light homogenizer disposed in the light output path of the first aperture; a second aperture disposed in the light output path of the light homogenizer; and a light modulation component disposed in the light output path of the second aperture. This application can effectively homogenize the hybrid light, achieving good homogenization results, and also reduces the amount of invalid hybrid light incident on the light modulation component, thereby improving the imaging quality of the hybrid light by the light modulation component.

Description

Technical Field

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

[0002] Most current home projector technologies use LED combination light sources to achieve white light emission. However, the inherent limitations of LED light sources, such as insufficient brightness and short lifespan, have hindered the further development of home projectors. To overcome the shortcomings of pure LED light sources in home projectors, some have proposed using a hybrid light source solution—a combination of laser and LED. This hybrid light source leverages the advantages of laser in terms of brightness, color purity, and lifespan to compensate for the shortcomings of pure LED light sources. However, in the laser-LED hybrid light, the significant difference between the optical spread of LEDs and lasers makes it difficult to achieve uniform light distribution. Summary of the Invention

[0003] The purpose of this application is to provide a projection device to solve the technical problem of difficulty in uniform light mixing of laser and LED in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is: a projection device, comprising a hybrid light source for emitting hybrid light, the hybrid light including laser light and LED light; a first aperture disposed on the light output path of the hybrid light source; a light homogenizing device disposed on the light output path of the first aperture; a second aperture disposed on the light output path of the light homogenizing device; and a light modulation component disposed on the light output path of the second aperture.

[0005] Optionally, the projection device further includes a first lens disposed in the optical path between the light homogenizer and the second aperture.

[0006] Optionally, the projection device further includes a reflector and a second lens, which are sequentially disposed in the optical path between the first lens and the second aperture.

[0007] Optionally, the light modulation component includes a PBS prism and an LCOS. The mixed light emitted through the second aperture is incident on the LCOS through the PBS prism. After being modulated into image light by the LCOS, the mixed light is emitted from the PBS prism.

[0008] Optionally, the optical modulation assembly further includes an analyzer disposed on the light-incident side and / or the light-outcident side of the PBS prism.

[0009] Optionally, the hybrid light source includes a first optical module, which includes a first light source and a second light source, the first light source being used to emit a first light and the second light source being used to emit a second light; a second optical module, which includes a third light source, the third light source being used to emit a third light; and a first light combining module, which is used to combine the first light, the second light and the third light; wherein the optical expansion of the first light and the second light is greater than the optical expansion of the third light, and the third light is a red laser.

[0010] Optionally, the optical path distance from the third light source to the light outlet of the first light combining module is greater than the optical path distance from the first light source to the light outlet of the first light combining module, and the optical path distance from the third light source to the light outlet of the first light combining module is greater than the optical path distance from the second light source to the light outlet of the first light combining module.

[0011] Optionally, the first light is blue light, the second light is green light, and the optical path distance from the first light source to the light output port of the first light combining module is greater than the optical path distance from the second light source to the light output port of the first light combining module.

[0012] Optionally, the hybrid light source includes a third optical module, which includes a fourth light source and a fifth light source, the fourth light source being used to emit a fourth light and the fifth light source being used to emit a fifth light; a fourth optical module, which includes a sixth light source, the sixth light source being used to emit a sixth light; and a second light combining module, the second light combining module being used to combine the fourth light, the fifth light and the sixth light; wherein the optical expansion of the fourth light and the optical expansion of the fifth light are respectively less than the optical expansion of the sixth light, the fourth light is a blue laser and the fifth light is a red laser.

[0013] Optionally, the sixth light is green light, the optical path distance from the fourth light source to the light outlet of the second light combining module is greater than the optical path distance from the sixth light source to the light outlet of the second light combining module, and the optical path distance from the fifth light source to the light outlet of the second light combining module is greater than the optical path distance from the sixth light source to the light outlet of the second light combining module.

[0014] The embodiments of this application have at least the following beneficial effects: Before homogenization, the angular distribution of the mixed light is controlled by a first aperture to prevent a portion of the mixed light from failing to reach the spatial light modulator due to an excessively large beam cone angle after passing through the homogenizing device. After homogenization, the surface distribution of the mixed light is controlled by a second aperture to block unwanted stray light and ensure that the shape and size of the mixed light spot are adapted to the optical modulation component. This method can effectively homogenize the mixed light, resulting in good homogenization effect and reducing the amount of invalid mixed light incident on the optical modulation component, thereby improving the imaging quality of the mixed light by the optical modulation component. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0016] Figure 1 This is a schematic diagram of the projection device in the embodiments of this application;

[0017] Figure 2 This is a schematic diagram of a hybrid light source structure in an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of another structure of the hybrid light source in the embodiments of this application.

[0019] The markings in the diagram are as follows:

[0020] 1. Hybrid light source; 11. First optical module; 111. First light source; 112. Second light source; 12. Second optical module; 121. Third light source; 13. First light combining module; 14. Third optical module; 141. Fourth light source; 142. Fifth light source; 15. Fourth optical module; 151. Sixth light source; 16. Second light combining module; 2. First aperture; 3. Beam homogenizer; 4. First lens; 5. Mirror; 6. Second lens; 7. Second aperture; 8. Light modulation assembly; 81. PBS prism; 82. LCOS; 83. Polarizer; 9. Lens. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0022] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are used solely for descriptive purposes. They 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 patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "first" and "second" are used solely for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0023] This application provides a projection device, such as... Figure 1 As shown, the projection device includes a hybrid light source 1, a first aperture 2, a light homogenizer 3, a second aperture 7, and a light modulation assembly 8. The hybrid light source 1 emits hybrid light, which includes laser and LED light. The first aperture 2 is positioned in the light output path of the hybrid light source 1. The light homogenizer 3 is positioned in the light output path of the first aperture 2. The second aperture 7 is positioned in the light output path of the light homogenizer 3. The light modulation assembly 8 is positioned in the light output path of the second aperture 7. That is, the hybrid light emitted from the hybrid light source 1 passes sequentially through the first aperture 2, the light homogenizer, the second aperture 7, and the light modulation assembly 8. After being modulated into image light by the light modulation assembly 8, the hybrid light is emitted towards the lens 9.

[0024] In the mixed light emitted from the mixed light source 1, the optical expansion of the LED is significantly greater than that of the laser, resulting in a larger spot area for the mixed light. The spot area at the entrance of the homogenizing device 3 determines the beam cone angle at its exit. If the outer ring of the mixed light spot passes through the homogenizing device 3, the excessively large beam cone angle will prevent it from hitting the light modulation component 8. Therefore, before the mixed light enters the homogenizing device 3 for homogenization, the first aperture 2 blocks the outer ring of the mixed light spot, ensuring that the mixed light after passing through the first aperture 2 has a suitable beam cone angle after homogenization by the homogenizing device 3 and can then hit the light modulation component 8. Here, the homogenizing device 3 can be a compound eye projection lens, and the light modulation component 8 can include an LCOS 82. After passing through the homogenizing device 3 and before entering the light modulation component 8, the second aperture 7 blocks unwanted stray light from the mixed light, controlling the shape and area of ​​the mixed light spot, resulting in a rectangular spot that ultimately falls onto the light modulation component 8.

[0025] The projection device provided in this application controls the angular distribution of the mixed light before homogenization by a first aperture 2, preventing a portion of the mixed light after passing through the homogenizing device 3 from failing to reach the spatial light modulator due to an excessively large beam cone angle. After homogenization, the surface distribution of the mixed light is controlled by a second aperture 7, blocking unwanted stray light and ensuring that the shape and size of the mixed light spot are adapted to the light modulation component 8. This method effectively homogenizes the mixed light, resulting in good homogenization performance and reducing the amount of invalid mixed light incident on the light modulation component 8, thereby improving the imaging quality of the mixed light by the light modulation component 8.

[0026] In some embodiments, the projection device further includes a first lens 4, which is disposed in the optical path between the light homogenizer 3 and the second aperture 7. The first lens 4 between the light homogenizer 3 and the second aperture 7 can collect the mixed light and prevent the spot area of ​​the mixed light from increasing during the transmission of the light homogenizer 3 and the second aperture 7.

[0027] In some embodiments, the projection device further includes a reflector 5 and a second lens 6, which are sequentially disposed in the optical path between the first lens 4 and the second aperture 7. By setting the reflector 5, the transmission direction of the mixed light can be changed, preventing the mixed light from always transmitting in the same direction, which is beneficial for reducing the length of the projection device.

[0028] In some embodiments, the light modulation assembly 8 includes a PBS prism 81 and an LCOS 82. The mixed light emitted through the second aperture 7 is incident on the LCOS 82 through the PBS prism 81. After being modulated into image light by the LCOS 82, the mixed light is emitted from the PBS prism 81 and then enters the lens 9.

[0029] In some embodiments, the optical modulation assembly 8 further includes an analyzer 83, which is disposed on the light-incident side and / or the light-exit side of the PBS prism 81. The analyzer 83 can be disposed on the light-incident side of the PBS prism 81, on the light-exit side of the PBS prism 81, or simultaneously on both the light-incident and light-exit sides of the PBS prism 81. Figure 1 As shown, the analyzer 83 is simultaneously disposed on the light-incident side and the light-outcident side of the PBS prism 81, and performs polarization analysis on the mixed light incident on the PBS prism 81 and the image light exiting the PBS prism 81, respectively.

[0030] In some embodiments, such as Figure 2As shown, the hybrid light source 1 includes a first optical module 11, a second optical module 12, and a first light combining module 13. The first optical module 11 includes a first light source 111 and a second light source 112. The first light source 111 emits a first light, and the second light source 112 emits a second light. In some embodiments, the first light is blue light and the second light is green light. The second optical module 12 includes a third light source 121, which emits a third light. In this embodiment, the third light is red light. The first light combining module 13 combines the first, second, and third light. The optical expansion of the first and second light is greater than that of the third light. For example, the first and second light can be broadband light emitted by an LED or fluorescence. Fluorescence can be generated using a fixed phosphor wheel, color wheel, etc., which are not limited herein. The third light can be a laser, preferably a linearly polarized laser. Since the optical expansion of the first and second rays is greater than that of the third ray, when combining the first, second, and third rays, the differences in their spectral density and optical expansion can be fully utilized. This allows the combined light source to achieve a further increase in brightness while simultaneously reducing its size. Furthermore, because the first light source 111 and the second light source 112 in the first optical module 11 have large optical expansion, non-imaging optical principles can be fully utilized to recover and reuse the light emitted from the first optical module 11, significantly improving the light extraction efficiency of the light source.

[0031] In some embodiments, the first optical module 11 includes a first light source 111 and a second light source 112. The first light source 111 and the second light source 112 are LED light sources. The first light is blue light, and the second light is green light. Preferably, the spectral range of the first light is 480±15nm, and the spectral range of the second light is 538nm±15nm. A first collecting component and a second collecting component are used to collect the light emitted from the first light source 111 and the second light source 112 and illuminate them onto a polarizing component. The first polarizing component and the second polarizing component are used to polarize the emitted first light and second light, thereby matching the subsequent light modulation component 8 (LCOS). The first polarizing component and the second polarizing component can use linear polarizers for polarization. A first recovery component and a second recovery component (not shown in the figure) are used to pass the light of the first polarized state after polarization by the first polarizing component and the second polarizing component, and to reflect the light of the second polarized state, which is perpendicular to the first polarization state, back to the light source component for reuse. In some embodiments, the first recovery component and the second recovery component are reflective polarization enhancement films (DBEF, dual brightness enhancement film).

[0032] In some embodiments, please continue to see Figure 2The second optical module 12 includes a third light source 121, a reflector, a speckle-reducing component, and a collimation component. The third light source 121 emits a third light, which is a red laser. Preferably, the spectral range of the third light source 121 is 625nm ± 2nm. Since the spectral range of the third light emitted by the third light source 121 differs significantly from that of the first light emitted by the first light source 111 and the second light emitted by the second light source 112, the design difficulty for the first light combining module 13 is relatively low. Furthermore, because the color coordinates of the third light source 121 are closer to the color gamut extreme value than the broad-spectrum red light emitted by the LED red light source, the color gamut range of this light source system is larger than that of a combined light source of red, blue, and green LEDs, resulting in better color rendering and effectively improving the user experience. The reflector is mainly used to reflect the third light so that it enters the first light combining module 13. Figure 2 In the described optical path architecture, the reflector fully utilizes the lateral space of the first light source 111 and the second light source 112. Simultaneously, this design reduces interference between light source components while minimizing the volume of the light source system. In some embodiments, the speckle-reducing component is positioned between the reflector and the first light-combining module 13. This arrangement effectively eliminates speckle in the third light, improving the efficiency of the white light emitted from the light source system. Furthermore, it broadens the optical extension of the third light, allowing the first, second, and third lights to fully contact each other within the first light-combining module 13, achieving optimal light combination. In some embodiments, the reflector and speckle-reducing component are integrated, enabling speckle reduction and reflection of the third light. In other embodiments, the speckle-reducing component is positioned after the first light-combining module 13 and before the light-uniforming module. This fully utilizes the difference in optical extension between the third light and the first and second lights, allowing for a differentiated design of the first light-combining module 13 and improving its light-combining efficiency.

[0033] In some embodiments, for a scheme where the speckle-reducing component is positioned between the reflector and the first light-combining module 13, please refer to [link to previous document]. Figure 2 The first light-combining module 13 may include a first light-combining component and a second light-combining component. In this embodiment, the first light-combining component is used to transmit red light and reflect blue light, while the second light-combining component is used to transmit red light, transmit blue light, and reflect green light. This configuration ensures that the spread of the third light after speckle reduction by the speckle-reducing component matches the spread of the first and second light, thus enabling light combining through wavelength combining. Furthermore, since the speckle-reducing component can be integrated with the reflector, the optical path volume can be further reduced.

[0034] In some embodiments, the optical path distance from the third light source 121 to the light outlet of the first light combining module 13 is greater than the optical path distance from the first light source 111 to the light outlet of the first light combining module 13, and the optical path distance from the third light source 121 to the light outlet of the light combining module is greater than the optical path distance from the second light source 112 to the light outlet of the first light combining module 13. For details, please refer to... Figure 2 The optical path distance from the first light source 111 to the output port of the first light combining module 13 is L2+D2+D1, the optical path distance from the second light source 112 to the output port of the first light combining module 13 is L1+D1, and the optical path distance from the third light source 121 to the output port of the first light combining module 13 is L3+D3+D2+D1. L3+D3+D2+D1>L1+D1, and L3+D3+D2+D1>L2+D2+D1. Among the three light sources—first light source 111, second light source 112, and third light source 121—the third light has the smallest optical expansion, while the optical expansion of the first and second lights is greater than that of the third light. Based on the characteristic that light with a larger optical expansion suffers more light loss during propagation, the first and second lights are more prone to light loss than the third light during propagation. When designing the optical path, the first light source 111 and the second light source 112 should be placed relatively close to the outlet of the first light combining module 13 to reduce the light loss of the first and second light.

[0035] In some embodiments, the first light is blue light, the second light is green light, and the optical path distance from the first light source 111 to the light output port of the first light combining module 13 is greater than the optical path distance from the second light source 112 to the light output port of the first light combining module 13. For details, please refer to... Figure 2 The optical path distance from the first light source 111 to the light outlet of the first light combining module 13 is L2+D2+D1, the optical path distance from the second light source 112 to the light outlet of the first light combining module 13 is L1+D1, and the optical path distance from the third light source 121 to the light outlet of the first light combining module 13 is L3+D3+D2+D1, where L3+D3+D2+D1>L2+D2+D1>L1+D1. Among the two light sources, the second light source 112 and the first light source 111, green light contributes significantly to the screen brightness, so light loss needs to be minimized. Therefore, in the optical path design, the second light source 112 is positioned relatively closer to the outlet of the first light combining module 13 to relatively reduce green light loss and make the displayed image brighter.

[0036] In some embodiments, such as Figure 3As shown, the hybrid light source 1 includes a third optical module 14, a fourth optical module 15, and a second light-combining module 16. The third optical module 14 includes a fourth light source 141 and a fifth light source 142. The fourth light source 141 emits a fourth light, and the fifth light source 142 emits a fifth light. The fourth light is a blue laser, and the fifth light is a red laser. The fourth optical module 15 includes a sixth light source 151, which emits a sixth light. In this embodiment, the sixth light is green light. The second light-combining module 16 combines the fourth, fifth, and sixth lights, which can be done using wavelength combining or optical expansion combining. The optical expansion of the fourth and fifth lights is less than that of the sixth light. For example, the sixth light can be broadband light emitted by an LED or fluorescence. Fluorescence can be generated using a fixed phosphor sheet, color wheel, etc., which are not limited herein. The optical expansion of the fourth and fifth beams is smaller than that of the sixth beam. Therefore, when combining the fourth, fifth, and sixth beams, the differences in their spectra and optical expansion can be fully utilized, thereby enabling the combined light source to achieve a further increase in brightness while reducing its size.

[0037] In some embodiments, such as Figure 3 As shown. The third optical module 14 includes a fourth light source 141, a fifth light source 142, a speckle reduction assembly, and a lens assembly. The speckle reduction assembly is used to reduce speckle on the fourth and fifth beams. Specifically, the fourth light source 141 is a blue laser, and the fifth light source 142 is a red laser. The speckle reduction assembly includes a first scattering plate and a second scattering plate. The first scattering plate is used to reduce speckle on the fourth beam emitted by the fourth light source 141, and the second scattering plate is used to reduce speckle on the fifth beam emitted by the fifth light source 142. The lens assembly includes a first lens 4 and a second lens 6. When the speckle of the fourth and fifth beams is large, or when the fourth light source 141 and the fifth light source 142 use an array laser, the first lens 4 and the second lens 6 can collect the fourth and fifth beams respectively, ensuring that the optical expansion of the fourth beam and the optical expansion of the fifth beam are less than the optical expansion of the sixth beam.

[0038] The fourth optical module 15 includes a sixth light source 151, a collecting element, a polarizing element, and a recycling element. The sixth light source 151 emits a sixth light; in this embodiment, the sixth light source 151 is a green LED light source, and the sixth light is green. The collecting element is disposed in the output light path of the sixth light source 151 to collect the light emitted from the sixth light source 151 and illuminate the polarizing element. The polarizing element is disposed in the output light path of the collecting element to polarize the sixth light emitted from the collecting element, thereby matching the subsequent light modulation assembly 8 (LCOS). The polarizing element can be a linear polarizer. A recycling element is also disposed in the output light path of the polarizing element. The recycling element allows the polarized light of the first polarization state to pass through and reflects the light of the second polarization state, which is perpendicular to the first polarization state, back to the sixth light source 151 for reuse. In some embodiments, the recycling element is a reflective polarizing brightness enhancement film (DBEF).

[0039] In some embodiments, see Figure 3 The second light combining module 16 may include a third light combining component, a fourth light combining component, and a fifth light combining component; the third light combining component is used to reflect the fourth light, the fourth light combining component is used to transmit the fourth light and reflect the fifth light, and the fifth light combining component is used to transmit the fourth light, transmit the fifth light, and reflect the sixth light. This arrangement achieves light combining, further reducing the optical path size.

[0040] In some embodiments, the sixth light is green light. The optical path distance from the fourth light source 141 to the light outlet of the second light combining module 16 is greater than the optical path distance from the sixth light source 151 to the light outlet of the second light combining module 16, and the optical path distance from the fifth light source 142 to the light outlet of the second light combining module 16 is greater than the optical path distance from the sixth light source 151 to the light outlet of the second light combining module 16. Based on the characteristic that light with greater optical expansion suffers greater light loss during propagation, and because green light contributes significantly to screen brightness, it is necessary to prioritize minimizing light loss. Therefore, in the optical path design, the sixth light source 151 is positioned relatively closer to the outlet of the second light combining module 16 to relatively reduce green light loss and make the displayed image brighter.

[0041] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A projection device, characterized in that, include: A hybrid light source for emitting mixed light, the mixed light including laser and LED light; The first aperture is disposed in the light output path of the hybrid light source; A light-diffusing device is disposed in the light-emitting path of the first aperture; The second aperture is disposed in the light output path of the light homogenizing device; as well as An optical modulation component is disposed in the light output path of the second aperture; The hybrid light source includes: A first optical module, comprising a first light source and a second light source, wherein the first light source is used to emit a first light and the second light source is used to emit a second light; A second optical module, the second optical module including a third light source, the third light source being used to emit third light; and A first light combining module is used to combine the first light, the second light, and the third light. Wherein, the optical expansion of the first light and the second light is greater than the optical expansion of the third light, and the third light is a red laser; The optical path distance from the third light source to the light outlet of the first light combining module is greater than the optical path distance from the first light source to the light outlet of the first light combining module, and the optical path distance from the third light source to the light outlet of the first light combining module is greater than the optical path distance from the second light source to the light outlet of the first light combining module.

2. A projection device, characterized in that, include: A hybrid light source for emitting mixed light, the mixed light including laser and LED light; The first aperture is disposed in the light output path of the hybrid light source; A light-diffusing device is disposed in the light-emitting path of the first aperture; The second aperture is disposed in the light output path of the light homogenizing device; as well as An optical modulation component is disposed in the light output path of the second aperture; The hybrid light source includes: The third optical module includes a fourth light source and a fifth light source, wherein the fourth light source is used to emit a fourth light and the fifth light source is used to emit a fifth light; The fourth optical module includes a sixth light source for emitting a sixth light; and The second light combining module is used to combine the fourth light, the fifth light and the sixth light; Wherein, the optical expansion of the fourth light and the optical expansion of the fifth light are respectively less than the optical expansion of the sixth light, the fourth light is a blue laser, and the fifth light is a red laser; The sixth light is green light. The optical path distance from the fourth light source to the light outlet of the second light combining module is greater than the optical path distance from the sixth light source to the light outlet of the second light combining module. The optical path distance from the fifth light source to the light outlet of the second light combining module is greater than the optical path distance from the sixth light source to the light outlet of the second light combining module.

3. A projection device according to claim 1 or 2, characterized in that, The projection device further includes a first lens, which is disposed in the optical path between the light homogenizer and the second aperture.

4. A projection device according to claim 3, characterized in that, The projection device further includes a reflector and a second lens, which are sequentially arranged in the optical path between the first lens and the second aperture.

5. A projection device according to claim 1 or 2, characterized in that, The light modulation component includes a PBS prism and an LCOS. The mixed light emitted through the second aperture is incident on the LCOS through the PBS prism. After being modulated into image light by the LCOS, the mixed light is emitted from the PBS prism.

6. A projection device according to claim 5, characterized in that, The optical modulation assembly also includes a polarizer, which is disposed on the light-incident side and / or the light-outcident side of the PBS prism.

7. A projection device according to claim 1, characterized in that, The first light is blue light, the second light is green light, and the optical path distance from the first light source to the light output port of the first light combining module is greater than the optical path distance from the second light source to the light output port of the first light combining module.

8. A projection device according to claim 7, characterized in that, The projection device further includes a first lens, which is disposed in the optical path between the light homogenizer and the second aperture. or, The light modulation component includes a PBS prism and an LCOS. The mixed light emitted through the second aperture is incident on the LCOS through the PBS prism. After being modulated into image light by the LCOS, the mixed light is emitted from the PBS prism.

9. A projection device according to claim 8, characterized in that, The projection device further includes a first lens, which is disposed in the optical path between the light homogenizer and the second aperture; the projection device further includes a reflector and a second lens, which are disposed sequentially in the optical path between the first lens and the second aperture.

10. A projection device according to claim 7, characterized in that, When the light modulation component includes a PBS prism and an LCOS, the mixed light emitted through the second aperture is incident on the LCOS through the PBS prism, and the mixed light is modulated into image light by the LCOS and then emitted from the PBS prism. The optical modulation assembly also includes a polarizer, which is disposed on the light-incident side and / or the light-outcident side of the PBS prism.

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