A projection display system

Abstract

The utility model belongs to the field of projection equipment discloses a projection display system, can realize the separation of light source and projection assembly through the mode of optical fiber coupling, can separate the light source independently, effectively solves the heat dissipation and noise problem of light source, makes the projection system more stable, reliable operation, also can be convenient for making the projection assembly smaller, reduces the occupied space of projection assembly.

Description

Technical Field

[0001] This utility model belongs to the field of projection equipment technology, and specifically relates to a projection display system. Background Technology

[0002] In traditional home projectors, the light source and projection system are usually integrated together, making the entire device more compact and taking up less space. However, integrating the light source and projection system also presents the following problems:

[0003] 1. Making a projection system smaller increases the difficulty and space requirements, and the light source module is not easy to place in insensitive areas;

[0004] 2. The heat dissipation system of the light source module is too close to the projection system, which leads to increased noise of the projection system and reduced viewing comfort.

[0005] 3. The heat dissipation space of the light source module is small and not independent, which leads to a decrease in the reliability of the light source. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a solution to the problems of existing projection devices that combine the light source module with the projection system, resulting in large space occupation and poor heat dissipation.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A projection display system includes a separately configured coupling light source and a projection component, wherein the coupling light source and the projection component are connected by an optical fiber module;

[0009] The coupled light source includes a light source assembly and a coupling lens assembly. The illumination light emitted by the light source assembly is coupled into the coupling terminal at the light input end of the optical fiber module through the coupling lens assembly.

[0010] The projection component includes a light shaping component disposed on the light input side of the light modulator. The light shaping component is connected to the light output end of the optical fiber module so that the illumination light emitted from the optical fiber module is shaped and then emitted to the light modulator.

[0011] In a possible implementation, the light source assembly includes several sub-light sources of different colors;

[0012] All the light emitted by the sub-light sources is directed directly to the coupling lens assembly to be coupled into the fiber optic module; or, the light emitted by the sub-light sources is first combined by a light-combining element and then coupled into the fiber optic module through the coupling lens assembly.

[0013] In a possible implementation, each sub-light source of the light source assembly is integrated and the light emitted is directly directed toward the coupling lens assembly;

[0014] At least two sub-light sources of the light source assembly are integrated, while the remaining sub-light sources are set separately. The light emitted by the integrated sub-light sources and the separately set sub-light sources is first combined by a light combining element and then coupled into the optical fiber module through the coupling lens assembly.

[0015] In a possible implementation, the coupling lens assembly includes 1-3 lenses, which are spherical lenses or aspherical lenses.

[0016] In one possible implementation, the optical shaping component includes a beam-expanding and collimating lens group that expands and shapes the illumination light emitted from the fiber optic module to adapt it to the optical modulation device.

[0017] In a possible implementation, the light shaping assembly includes a light homogenizing element disposed on the incident light side of the beam expanding and collimating lens group;

[0018] And / or, the light shaping assembly includes a light homogenizing element two disposed on the light-emitting side of the beam expanding and collimating lens group.

[0019] In possible implementations, the first light-diffusing element is a diffuser, and the second light-diffusing element is a compound eye or a light-diffusing rod.

[0020] In a possible implementation, the optical shaping component further includes a dynamic dissipation element and / or a static dissipation element disposed in the optical path.

[0021] In a possible implementation, the static dissipation element includes a polarization conversion element, a portion of which is located in the optical path to perform polarization state conversion on a portion of the illumination light;

[0022] Alternatively, the polarization conversion element includes a polarization conversion region and a light-transmitting region that are partitioned. The polarization conversion region performs polarization state conversion on light, and the light-transmitting region is a hollow region or has a diffusion layer.

[0023] In one possible implementation, the output light path of the coupled light source is provided with a switchable guiding component. When the guiding component is in different states, it guides the light to several different projection light paths, and each projection light path is provided with an optical fiber module and a projection component.

[0024] In a possible implementation, the guiding component includes a switchable reflective element one, which guides light to several different projection light paths when in different states.

[0025] Alternatively, the guiding component includes a guiding element one, a reflecting element two, and a guiding element two. The guiding element one can be switched to guide light to different switching optical paths when it is in different states. The switching optical path is provided with a reflecting element two and a switching guiding element two. When the guiding element two is in different states, it guides the light emitted from the guiding element one reflected by the reflecting element two to different projection optical paths.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The projection display system of this utility model can separate the light source and the projection component through fiber optic coupling. This not only makes the light source independent, effectively solving the problems of heat dissipation and noise, allowing the projection system to operate more stably and reliably, but also makes it easier to make the projection component smaller and reduce the space occupied by the projection component.

[0028] Moreover, the guiding component enables a single light source component to support multiple optical fibers, thereby allowing switching between different projection modules and achieving the goal of one machine for multiple projections. Attached Figure Description

[0029] Figure 1 A schematic diagram of the optical path structure of a projection display system;

[0030] Figure 2 This is a schematic diagram of the optical path structure under the first optical coupling method of a projection display system;

[0031] Figure 3 This is a schematic diagram of the optical path structure under a second optical coupling method in a projection display system;

[0032] Figure 4 This is a schematic diagram of the optical path structure under a third optical coupling method in a projection display system.

[0033] Figure 5 This is a schematic diagram of the optical path structure of a projection display system when the compound eye element is replaced with a light-diffusing rod.

[0034] Figure 6 This is a schematic diagram of the optical path structure of a projection display system that uses a guiding element to perform multiple projections from a single device.

[0035] Figure 7 This is a schematic diagram of the optical path structure of a projection display system that uses another guiding element to perform multiple projections from a single device.

[0036] In the diagram: 1-Coupled light source; 11-Sub-light source; 12-Coupled lens assembly; 2-Coupled terminal; 3-Fiber optic module; 4-Diffuser; 5-Collimating lens one; 6-Dynamic dissipation element; 7-Collimating lens two; 8-Polarization conversion element; 9-Compound eye; 10-Conversion mirror group; 11-Relay lens group; 12-DMD modulation device; 13-Prism group; 14-Light source integrated module; 15-Projection screen; 16-Light homogenizer; 17-Reflection element one; 18-Light combining element; 20-Projection assembly; 30-Guiding element one; 31-Reflection element two; 32-Guiding element two. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to specific embodiments.

[0038] In traditional home projectors, the light source and projection system are usually integrated, allowing for a more compact design and smaller footprint. However, in automotive applications or other fields with higher reliability requirements, separating the light source and projection system offers unique advantages. Firstly, separation allows for a smaller projection system, reducing its footprint, while the light source module can be placed in less space-sensitive areas. Secondly, separating the light source and projection system also allows the light source module's heat dissipation unit to be located further away from the projection system, significantly reducing noise and enhancing viewing comfort. Finally, separating the light source and projection system provides the light source module with its own independent cooling space, improving its reliability.

[0039] Therefore, this application provides a projection display system that separates the light source and the projection system, while improving the visual effect of the projection.

[0040] Please refer to Figure 1 As shown, an embodiment of this application provides a projection display system that may include a separately configured coupling light source 1 and a projection component 20, which are connected by an optical fiber module 3. The coupling light source 1 includes a light source component and a coupling lens component 12. The illumination light emitted by the light source component is coupled into the coupling terminal 2 at the light input end of the optical fiber module 3 through the coupling lens component 12. The projection component 20 includes a light shaping component disposed on the light input side of the optical modulator. The light shaping component is connected to the light output end of the optical fiber module 3 so that the illumination light emitted from the optical fiber module 3 is shaped and then emitted to the optical modulator.

[0041] In this design, the coupling light source 1 and the projection component 20 are separately configured and connected by an optical fiber module 3. The optical fiber module 3 enables long-distance light transmission between the separate coupling light source 1 and the projection component 20. This separation facilitates the separation of the coupling light source 1 and the projection component 20, avoiding problems such as poor heat dissipation and space occupation that occur when the coupling light source 1 and the projection component 20 are placed together. Since the light beam transmitted by the optical fiber module 3 is very small, coupling is necessary for it to enter the optical fiber module 3. Therefore, the coupling light source 1 may include a light source component and a coupling lens component 12. The coupling lens component couples the light emitted by the light source component into the coupling terminal 2 in the optical fiber component, and then into the optical fiber module 3 for light transmission. The projection component 20 is equipped with a light shaping component. As part of the projection component 20, the light shaping component can be easily connected to the separate light source component and the projection component 20 simply by flexibly arranging the flexible optical fiber module 3, which allows for flexible optical path adjustment. The optical shaping component is used to shape the light emitted from the fiber optic module 3 so that the emitted light is adapted to the optical modulation device after shaping. This enables efficient transmission of the separated light over long distances and allows it to be used by the optical modulation device.

[0042] Through the above technical solution, the optical fiber coupling method can realize the separation of the light source and the projection component 20. This not only makes it easier to separate the light source to effectively solve the problems of heat dissipation and noise, allowing the projection system to operate more stably and reliably, but also makes it easier to make the projection component 20 smaller and reduce the space occupied by the projection component 20.

[0043] In some implementations, the light emitted by the light source component can be white light or light of various different colors, which can be selected and configured according to the modulation method or type of the light modulation device.

[0044] Please refer to Figures 2-4 As shown in the embodiments of this application, the light source assembly preferably includes several sub-light sources 11 of different colors; in order to facilitate coupling, the arrangement of the multiple sub-light sources 11 of different colors can be in various ways. It can be that the light emitted by all the sub-light sources 11 is directly directed to the coupling lens assembly 12 to be coupled into the fiber optic module 3 through the coupling lens assembly 12, or the light emitted by the sub-light sources 11 is first combined by the light combining element 18 and then coupled into the fiber optic module 3 through the coupling lens assembly 12.

[0045] For example, in the arrangement structure of the first type of light source component, combined with Figure 2As shown, multiple sub-light sources 11 of different colors are arranged side by side and emit light independently. The emitted light is coupled through a coupling lens assembly 12. This arrangement is suitable because the total spacing between the sub-light sources 11 is less than the diameter of the coupling lens assembly. Figure 2 The three sub-light sources 11 are laser light sources of three different colors, red, green, and blue, respectively; in the arrangement structure of the second type of light source component, combined with Figure 3 As shown, some of the sub-light sources 11 have their light emission direction facing the coupling lens assembly 12. A light-combining element 18 is provided in the light emission direction of these sub-light sources to facilitate light combining with other sub-light sources 11. Other light sources can emit light from one side, pass through the light-combining element 18 for light combining, and then direct the light towards the coupling lens assembly 12. This arrangement is suitable for situations where the sub-light sources 11 are not arranged side by side and combine light independently. Figure 3 The three sub-light sources 11 are red, green, and blue laser light sources of different colors. The light combining element 18 is configured to transmit light of at least one color and reflect light of at least one other color. In the arrangement of the third light source assembly, one of the sub-light sources 11 faces the coupling lens assembly 12 in its light-emitting direction. A light combining element 18 for light combining is provided in the light-emitting direction of this sub-light source 11, so that the remaining sub-light sources can combine their light with this sub-light source through the light combining element 18. Figure 4 The sub-light source 11 is a laser light source of three different colors, namely red, green and blue, and the light combining element 18 is configured to transmit light of at least one color and reflect light of at least one other color.

[0046] To reduce the space occupied by the light source assembly, each sub-light source of the light source assembly is further integrated, and the emitted light is directly directed towards the coupling lens assembly; alternatively, at least two sub-light sources of the light source assembly are integrated, while the remaining sub-light sources are set separately. The light emitted by the integrated sub-light sources and the separately set sub-light sources is first combined by a light combining element and then coupled into the fiber optic module through the coupling lens assembly. That is, at least two sub-light sources 11 of different colors are integrated into one light source integration module 14, which reduces the space occupied by the light source assembly and further reduces the overall size of the system.

[0047] In addition, when the sum of the distances between the sub-light sources 11 arranged side by side is greater than the diameter of the coupling lens assembly 12, a light combining element 18 can be provided in the light emission direction of each sub-light source 11, and the light emitted by each sub-light source 11 can be guided to the incident range of the coupling lens assembly through the light combining element 18, thus achieving light combining. However, this arrangement is suitable for situations where the distance between the sub-light sources 11 is large.

[0048] In specific implementation, the coupling lens assembly 12 includes 1-3 lenses, which are spherical lenses or aspherical lenses. The coupling lens assembly 12 is used to combine the light emitted from the light source assembly, that is, to achieve coupling by combining the beams, so that the combined beam can enter the coupling terminal 2 and then enter the fiber optic module 3. The coupling lens assembly 12 may include at least one lens, which can be either a spherical lens or an aspherical lens, both of which can be used for beam combining of light.

[0049] In a preferred embodiment of the light shaping component, combined with Figure 1 As shown, the optical shaping component includes a beam expanding and collimating lens group, which expands and shapes the illumination light emitted from the optical fiber module 3 to adapt it to the optical modulation device.

[0050] The beam-expanding and collimating lens is used to expand and shape the illumination beam emitted from the fiber optic module 3, aligning the light emitted from the fiber optic module with the compound eye 9, so that the size and angle of the light spot in front of the compound eye 9 match the subsequent system components. The optical modulation device can be an LCD optical modulation device, a DLP optical modulation device, or an LCOS optical modulation device. When using one of these optical modulation devices, a suitable light source component is selected for coupling. Specifically, the beam-expanding and collimating lens group includes at least one collimating lens. When other functional components are provided, collimating lens 5 and collimating lens 7 can be set before and after it, respectively. These functional components can be dissipation elements, which allows for shaping both before and after dissipation processing, making the beam more suitable for the application requirements.

[0051] Based on this, in order to achieve beam homogenization, the light shaping assembly includes a homogenizing element one disposed on the incident side of the beam expanding and collimating lens group; and / or, the light shaping assembly includes a homogenizing element two disposed on the emitting side of the beam expanding and collimating lens group. By disposing homogenizing element one or homogenizing element two on the incident and / or emitting sides of the beam expanding and collimating lens group, the incident or emitted beam can be homogenized and shaped.

[0052] In the specific implementation process, combined with Figure 1 and Figure 5As shown, the first light-diffusing element is a diffuser 4, and the second light-diffusing element is a compound eye 9 or a light-diffusing rod 16. The diffuser 4 functions to diffuse light, optimize the uniformity of the light field, eliminate optical interference, and improve image quality. The compound eye 9 is composed of an array of multiple small lens units (such as rectangular or hexagonal), which can divide the incident non-uniform light source (such as LED, laser, or high-pressure mercury lamp) into several sub-beams. The divided sub-beams are superimposed on the focal plane of subsequent optical elements (such as relay lenses), and a uniform light intensity distribution is formed by utilizing the integration effect. The light-diffusing rod 16 is usually a transparent light guide rod with a rectangular or hexagonal cross-section (such as fused silica or optical glass). The light undergoes multiple total internal reflections (TIR) ​​within the rod, and the light from different paths mixes at the exit end. After multiple reflections, the light intensity distribution is further homogenized, eliminating residual hot spots or dark areas in the beam, thereby adjusting the shape of the outgoing light spot and reducing light energy waste.

[0053] To reduce the speckle effect when using a laser as a light source, the optical shaping assembly also includes a dynamic dissipation element 6 and / or a static dissipation element disposed in the optical path.

[0054] The static dissipation element can be a stationary dissipation element or a dynamic dissipation element. The speckle effect of the laser can be reduced by using the dynamic dissipation element 6 and / or the static dissipation element. The dynamic dissipation component can be an LSR element or a diffusion wheel, the purpose of which is to homogenize the laser spot and reduce the speckle effect of the laser. The dynamic dissipation element 6 can be a half-wave plate and a depolarizer, the purpose of which is to further reduce the speckle effect of the laser.

[0055] Furthermore, the static dissipation element includes a polarization conversion element 8, a portion of which is located in the optical path to perform polarization state conversion on a portion of the illumination light; or, the polarization conversion element 8 includes a polarization conversion region and a light-transmitting region arranged in sections, the polarization conversion region performing polarization state conversion on the light, and the light-transmitting region being a hollowed-out region or having a diffusion layer.

[0056] In this way, deflection conversion elements such as half-wave plates, by being partially positioned in the optical path, can perform polarization state conversion on a portion of the illumination light. This disrupts the coherence and phase relationship of the laser beam in the optical path, reducing speckle effects. Furthermore, the deflection conversion elements can be divided into deflection conversion regions and transmission regions. When a portion of the beam passing through the deflection conversion element passes through the polarization conversion region, the coherence and phase relationship of the laser beam is disrupted, further reducing speckle effects. The above two schemes can be selected and configured according to actual conditions or requirements.

[0057] To enable a single light source module to switch projection between multiple projection components 20, in the embodiments of this application, combined with Figure 6 and Figure 7As shown, the output light path of the coupled light source 1 is provided with a movable switching guide component. When the guide component is in different states, it guides the light to several different projection light paths. Each projection light path is provided with an optical fiber module 3 and a projection component 20.

[0058] Since the coupling light source 1 and the projection component 20 are set separately and connected by the fiber optic module 3, the relative positions of the projection component 20 or the coupling light source 1 can be arranged as needed. Furthermore, due to the flexible transmission characteristics of the fiber optic module 3, it is convenient to provide light sources for multiple projection components 20. Specifically, by setting a guiding component on the output light path of the coupling light source 1, the guiding component is used to guide and switch the light emitted by the coupling light source 1, and guides the beam to different projection light paths at different angles and attitudes. In this way, the light source of the projection components 20 on different projection light paths can be improved, and the effect of one machine projecting multiple objects can be achieved.

[0059] In some application scenarios, when multiple projection components are set up, the projection components can be placed in different locations according to the usage scenario. For example, as an in-vehicle projection device, multiple projection components can be placed on the roof, trunk, behind the driver and passenger seats, or in the middle of the vehicle. They can be easily connected and arranged through fiber optic modules. In this way, the needs of different projection positions can be met by switching the guiding components, which better meets different projection needs and greatly improves practicality.

[0060] In one implementation structure of the bootstrap component, combined with Figure 6 As shown, the guiding component includes a switchable reflective element 17, which guides light to several different projection light paths when in different states.

[0061] In this embodiment, light emitted from the coupled light source 1 can be switched and reflected onto different projection light paths via a movable, switchable reflective element 17. The reflective element 17 is a component with a changeable reflection angle, such as a MEMS (microelectromechanical system), which can precisely control the direction of light reflection. This embodiment can be used in an arrangement of multiple projection components 20 whose switching range is covered by the non-side-by-side reflective element 17.

[0062] In another implementation structure regarding the bootstrap component, combined with Figure 7 As shown, the guiding component includes a guiding element 30, a reflecting element 31, and a guiding element 32. The guiding element 30 can be switched to guide light to different switching optical paths when it is in different states. The switching optical path is provided with a reflecting element 31 and a switchable guiding element 32. When the guiding element 32 is in different states, it guides the light emitted from the guiding element 30 reflected by the reflecting element 31 to different projection optical paths.

[0063] In this implementation structure, multiple projection components 20 are arranged side by side, and two switching optical paths are formed by the switching element 1. The two switching optical paths are deflected by the reflection element 2 31, and then the light emitted from the switching optical path is guided to different projection optical paths by the guiding element 2 32. Since the fiber optic module 3 can be flexibly arranged, the switching optical path can be connected by bending the fiber optic module 3.

[0064] In the specific implementation process, combined with Figure 1 As shown, the projection assembly 20 may further include a convection mirror group 10, a relay lens group 11, a prism group 13, a light modulator, a lens module, and a projection screen 15, which are sequentially arranged on the light-emitting side of the light-monopolating element 2. Among them, the light modulator is a DMD modulator 12.

[0065] In one application scenario, the projection display system of this application embodiment is used in a vehicle-mounted laser projection device.

[0066] The above are merely preferred embodiments of this utility model. It should be noted that the above preferred embodiments should not be considered as limitations on this utility model, and the scope of protection of this utility model should be determined by the scope defined in the claims. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A projection display system, characterized in that, It includes a separately configured coupling light source (1) and projection component (20), which are connected by an optical fiber module (3); The coupled light source (1) includes a light source assembly and a coupling lens assembly (12). The illumination light emitted by the light source assembly is coupled into the coupling terminal (2) of the optical fiber module (3) through the coupling lens assembly (12). The projection component (20) includes a light shaping component disposed on the light input side of the light modulator. The light shaping component is connected to the light output end of the optical fiber module (3) so that the illumination light emitted from the optical fiber module (3) is shaped and emitted to the light modulator.

2. The projection display system as described in claim 1, characterized in that, The light source assembly includes several sub-light sources of different colors (11); All the light emitted by the sub-light sources (11) is directed directly to the coupling lens assembly (12) to be coupled into the fiber optic module (3) through the coupling lens assembly (12); or, the light emitted by the sub-light sources (11) is first combined by the light combining element (18) and then coupled into the fiber optic module (3) through the coupling lens assembly (12).

3. The projection display system as described in claim 2, characterized in that, Each sub-light source (11) of the light source assembly is integrated and emits light that is directly directed toward the coupling lens assembly (12); At least two sub-light sources (11) of the light source assembly are integrated, while the remaining sub-light sources (11) are set separately. The light emitted by the integrated sub-light sources (11) and the separately set sub-light sources (11) is first combined by the light combining element (18) and then coupled into the optical fiber module (3) through the coupling lens assembly (12).

4. The projection display system as described in claim 1, characterized in that, The coupling lens assembly (12) includes 1-3 lenses, which are spherical lenses or aspherical lenses.

5. A projection display system as described in claim 1, characterized in that, The optical shaping component includes a beam expanding and collimating lens group, which expands and shapes the illumination light emitted from the optical fiber module (3) to adapt it to the optical modulation device.

6. A projection display system as described in claim 5, characterized in that, The light shaping assembly also includes a light homogenizing element disposed on the light-incident side of the beam expanding and collimating lens group; And / or, the light shaping assembly includes a light homogenizing element two disposed on the light-emitting side of the beam expanding and collimating lens group.

7. A projection display system as described in claim 6, characterized in that, The first light-diffusing element is a diffuser (4), and the second light-diffusing element is a compound eye (9) or a light-diffusing rod (16).

8. A projection display system as described in claim 1, characterized in that, The optical shaping component also includes a dynamic dissipation element (6) and / or a static dissipation element disposed in the optical path.

9. A projection display system as described in claim 8, characterized in that, The static dissipation element includes a polarization conversion element (8), a portion of which is located in the optical path to convert the polarization state of a portion of the illumination light; Alternatively, the polarization conversion element (8) may include a polarization conversion region and a light-transmitting region that are partitioned, wherein the polarization conversion region performs polarization state conversion on light, and the light-transmitting region is a hollow region or is provided with a diffusion layer.

10. A projection display system as described in claim 1, characterized in that, The output light path of the coupled light source (1) is provided with a guide component that can be switched. When the guide component is in different states, it guides the light to several different projection light paths. Each projection light path is provided with an optical fiber module (3) and a projection component (20).

11. A projection display system as described in claim 10, characterized in that, The guiding component includes a switchable reflective element (17), which guides light to several different projection light paths when in different states. Alternatively, the guiding component includes a guiding element one (30), a reflecting element two (31), and a guiding element two (32). The guiding element one (30) can be switched to guide light to different switching optical paths when it is in different states. The switching optical path is provided with a reflecting element two (31) and a switching guiding element two (32). When the guiding element two (32) is in different states, it guides the light emitted from the guiding element one (30) reflected by the reflecting element two (31) to different projection optical paths.

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