Compact projection display system

Abstract

The utility model provides a compact projection display system. The compact projection display system comprises a laser light source, a curved reflector, a wavelength conversion device, a digital display light valve and a lens, the excitation light source emits excitation light, the part of the light is guided to the dichroscope or the small hole and then guided to enter the collecting lens group, the collecting lens group shapes the excitation light into convergent light, the convergent light enters the wavelength conversion device, the wavelength conversion device converts part of the excitation light into excited light, the excited light is guided to the concave face of the curved-surface reflector, and the curved-surface reflector emits the convergent light. The concave surface of the curved reflector shapes the excited light into a light beam with an angle required by the digital display light valve and reflects and guides the light beam to the surface of the digital display light valve, and the digital display light valve determines whether to guide the part of light to the lens device or not according to a signal sent by projection control; compared with the prior art, the projection display system adopts the curved-surface reflecting mirror to replace a curved-surface reflecting bowl, so that the structure is simpler, the cost is lower, the structure of a light path is optimized, and the energy loss of the whole light path is lower.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle lighting, and particularly relates to a compact projection display device. Background Art

[0002] Automobile headlight technology has gone through multiple eras, evolving from chemical lamps such as kerosene lamps and acetylene lamps to incandescent lamps, LED lamps, gas discharge lamps (gas lamps), and laser headlights. Each generation of technology has brought different advantages and characteristics. The disadvantages of halogen headlights mainly include low luminous efficiency, low brightness, and short lifespan. Although halogen headlights are still used in some cases, with the progress of technology, many modern vehicles have started to adopt more efficient and brighter LED or xenon headlights as standard equipment to meet the needs and safety considerations of drivers. With the increasing requirements for brightness in modern driving and intelligent headlights, the problem of low power of LED headlights has become more prominent. To increase brightness, the number of LEDs must be increased, and since LEDs have high requirements for heat dissipation, especially as the number of LEDs increases, the radiator becomes very large, resulting in a large volume.

[0003] Moreover, the optical expansion amount of LEDs is relatively large. When used for simple lighting originally, the LED chips could meet the requirements. With the gradual emergence and popularization of the demand for vehicle lamp intelligence, the application of digital display light valves in vehicle lamps has become more and more common. However, the characteristics of the large optical expansion amount of LEDs differ greatly from the requirements of the subsequent digital display light valves, resulting in low system efficiency. Therefore, it is urgent to develop a light source and its display system that are more compatible with digital display light valves.

[0004] The Chinese invention patent with the application number "202010341862.6" discloses an adaptive laser vehicle headlight with high optical brightness, a simple overall structure, high imaging resolution and contrast, and high light utilization rate. It includes an excitation light source, a white light generation unit, a non-uniform light generation unit, a spatial light modulator, and an imaging lens. The white light generation unit includes a wavelength conversion unit, and the wavelength conversion unit is a reflective structure for generating first light. The non-uniform white light generation unit includes a free-form reflector or a free-form lens for collecting the first light and mapping it into second light with an intensity gradient distribution. The spatial light modulator modulates an image according to the intensity gradient distribution of the second light and emits third light, and the imaging lens images the third light into the low beam or high beam area to form adaptive lighting.

[0005] In the existing free-form reflecting bowl or free-form lens, it is necessary to shape the excitation light, collect the stimulated light, and shape the stimulated light onto the DMD, which makes the design and manufacturing of the reflecting bowl extremely difficult. At the same time, the free-form lens or free-form reflecting bowl is placed in front of the wavelength conversion device to collect the stimulated light, and there is a hole in the free-form lens or free-form reflecting bowl. Since most of the energy of the stimulated light converted by the wavelength conversion device is within a small angle range (the same as or close to the angle of the incident excitation light), according to the principle of reversibility of light paths, this design will cause great efficiency loss. Summary of the Invention

[0006] To solve the problems of difficult design of the curved reflecting bowl and large light path efficiency loss in the prior art, a compact projection display system provided by the present invention includes a laser light source, a curved mirror, a wavelength conversion device, a digital display light valve, and a lens; the laser light source is used to provide the excitation light required by the system; the wavelength conversion device is used to convert the excitation light emitted by the laser light source into stimulated light of a specified wavelength for output; the curved mirror is used to reflect the stimulated light to the digital display light valve; the digital display light valve controls the stimulated light to enter the lens; the incident light path includes the excitation light emitted by the laser light source falling into the wavelength conversion device after passing through the curved mirror; the output light path includes the stimulated light entering the digital display light valve after being reflected by the curved mirror; the digital display light valve receives the stimulated light and emits the stimulated light to the lens according to the requirements of the projection system.

[0007] In a compact projection display system provided by the present invention, preferably, a small hole and / or a dichroic mirror are provided on the curved mirror; the curved mirror is a parabolic mirror, a hyperbolic mirror, or a free-form mirror.

[0008] In a compact projection display system provided by the present invention, preferably, the dichroic mirror and the curved mirror can be separately provided or integrally formed.

[0009] In a compact projection display system provided by the present invention, preferably, the excitation light emitted by the laser light source reaches the wavelength conversion device after passing through the small hole and / or the dichroic mirror; the concave surface of the curved mirror faces the wavelength conversion device; the stimulated light enters the digital display light valve after being reflected by the concave surface of the curved mirror when exiting from the wavelength conversion device.

[0010] In a compact projection display system provided by the present invention, preferably, a collecting lens group is provided before the wavelength conversion device; the collecting lens group is used to converge the excitation light onto the wavelength conversion device and diffusely emit the stimulated light to the curved mirror.

[0011] A compact projection display system provided by the present utility model. Preferably, the wavelength conversion device is a static device; the wavelength conversion device includes a wavelength conversion part and a heat sink structure part; the wavelength conversion material is filled in the wavelength conversion part; and a material with high thermal conductivity and high reflectivity is arranged in the heat sink structure part.

[0012] A compact projection display system provided by the present utility model. Preferably, the wavelength conversion material is a yellow light wavelength conversion material; the heat sink structure part is a double-layer structure; one layer of the heat sink structure part is a silver structure with high thermal conductivity and high reflectivity, and the other layer is a copper structure for heat dissipation.

[0013] A compact projection display system provided by the present utility model. Preferably, it further includes a heat dissipation component; the heat dissipation component is connected to the wavelength conversion device; and the heat dissipation component is a radiator with heat dissipation fins or a liquid cooling radiator or a semiconductor refrigeration radiator.

[0014] A compact projection display system provided by the present utility model. Preferably, the wavelength conversion device is a dynamic device; the wavelength conversion device includes a wavelength conversion part, a substrate, and a rotating device; the wavelength conversion part is arranged on the substrate; the rotating device drives the substrate to rotate at a high speed; and the wavelength conversion material is arranged in the wavelength conversion part.

[0015] A compact projection display system provided by the present utility model. Preferably, the excitation light emitted by the laser light source is blue light or purple light or ultraviolet light.

[0016] A compact projection display system provided by the present utility model. Preferably, a plurality of small mirrors and a projection display control system are arranged in the digital display light valve; and the projection display control system controls the states of the small mirrors through binary signals.

[0017] A compact projection display system provided by the present utility model. Preferably, the small mirror includes two states of "0" and "1"; when the output signal in the projection display control system is 0, the small mirror guides the synthesized light outside the lens; when the output signal in the projection display control system is 1, the small mirror guides the synthesized light into the lens.

[0018] A compact projection display system provided by the present utility model includes a laser light source, a curved mirror, a wavelength conversion device, a digital display light valve, and a lens; the excitation light source emits excitation light, and a part of this light is guided to a dichroic mirror or a small hole, and then is guided to enter a collection lens group. The collection lens group shapes the excitation light into a converging light and enters the wavelength conversion device. The wavelength conversion device converts a part of the excitation light into stimulated light, and the stimulated light is guided to the concave surface of the curved mirror. The concave surface of the curved mirror shapes the stimulated light into a light beam with an angle required by the digital display light valve, and reflects and guides the light beam to the surface of the digital display light valve. The digital display light valve decides whether to guide this part of the light to the lens device according to the signal sent by the projection control; compared with the prior art, the projection display system of the present utility model uses a curved mirror to replace the curved reflector bowl, with a simpler structure and lower cost. At the same time, the structure of the optical path is optimized, resulting in lower energy loss in the overall optical path. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. 6 is a schematic structural diagram of Embodiment 1 of a compact projection display system provided by the present utility model;

[0020] Figure 2 FIG. 6 is a schematic structural diagram of Embodiment 1 of a compact projection display system provided by the present utility model;

[0021] Figure 3 FIG. 14 is a schematic structural diagram of a static device of the wavelength conversion device of a compact projection display system provided by the present utility model;

[0022] Figure 4 FIG. 18 is a schematic structural diagram of a dynamic device of the wavelength conversion device of a compact projection display system provided by the present utility model;

[0023] Figure 5 FIG. 22 is a schematic structural diagram of Embodiment 2 of a compact projection display system provided by the present utility model;

[0024] Reference numerals: laser light source 1, curved mirror 2, wavelength conversion device 3, wavelength conversion part 3-1, sunk structure part 3-2, substrate 3-3, rotating device 3-4, digital display light valve 4, lens 5, small hole 6, dichroic mirror 7, collection lens group 8. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "left side", "right side", "upper part", "lower part", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second", etc. do not represent the importance of the components, so it cannot be understood as a limitation to the present utility model. The specific dimensions adopted in this embodiment are only for illustrating the technical solution by way of example and do not limit the protection scope of the present utility model. As Figure 1 shown, the present utility model provides a compact projection display system, which includes a laser light source 1, a curved mirror 2, a wavelength conversion device 3, a digital display light valve 4 and a lens 5; the laser light source 1 is used to provide the excitation light required by the system; the wavelength conversion device 3 is used to convert the excitation light emitted by the laser light source 1 into stimulated light of a specified wavelength and emit it; the curved mirror 2 is used to reflect the stimulated light to the digital display light valve; the digital display light valve 4 controls the stimulated light to enter the lens; the incident light path includes the excitation light emitted by the laser light source 1 falling into the wavelength conversion device 3 after passing through the curved mirror 2; the outgoing light path includes the stimulated light entering the digital display light valve 4 after being reflected by the curved mirror 2; after receiving the stimulated light, the digital display light valve 4 emits the stimulated light to the lens 5 according to the requirements of the projection system.

[0027] More specifically, a small hole 6 and / or a dichroic mirror 7 are provided on the curved mirror 2; the curved mirror 2 is a parabolic mirror, a hyperbolic mirror or a free-form mirror.

[0028] More specifically, the dichroic mirror 7 and the curved mirror 2 can be detachably arranged or integrally formed.

[0029] More specifically, the excitation light emitted by the laser light source 1 reaches the wavelength conversion device 3 after passing through the small hole 6 and / or the dichroic mirror 7; the concave surface of the curved mirror 2 faces the wavelength conversion device 3; the stimulated light enters the digital display light valve 4 after being reflected by the concave surface of the curved mirror 2 after being emitted from the wavelength conversion device 3.

[0030] More specifically, a collection lens group 8 is provided before the wavelength conversion device 3; the collection lens group 8 is used to converge the excitation light on the wavelength conversion device 3 and diffusely emit the stimulated light to the curved mirror 2.

[0031] More specifically, the wavelength conversion device 3 is a static device; the wavelength conversion device 3 includes a wavelength conversion part 3-1 and a heat sink structure part 3-2; the wavelength conversion part 3-1 is filled with a wavelength conversion material; the heat sink structure part 3-2 is provided with a material having high thermal conductivity and high reflectivity.

[0032] More specifically, the wavelength conversion material is a yellow light wavelength conversion material; the heat sink structure part 3-2 is a double-layer structure; one layer of the heat sink structure part 3-2 is a silver structure with high thermal conductivity and high reflectivity, and the other layer is a copper structure for heat dissipation. From the light incident direction, in sequence are the wavelength conversion material, the silver structure, and the copper structure. The silver structure provides high thermal conductivity and high reflectivity for the wavelength reflection material. The copper structure provides a heat dissipation function for the wavelength conversion material. The copper structure can be arranged on a radiator, and the radiator is a radiator with heat dissipation fins or a liquid-cooled radiator or a semiconductor refrigeration radiator.

[0033] More specifically, it further includes a heat dissipation component; the heat dissipation component is connected to the wavelength conversion device; the heat dissipation component is a radiator with heat dissipation fins or a liquid-cooled radiator or a semiconductor refrigeration radiator.

[0034] More specifically, the wavelength conversion device 3 is a dynamic device; the wavelength conversion device 3 includes a wavelength conversion part 3-1, a substrate 3-3, and a rotating device 3-4; the wavelength conversion part 3-1 is arranged on the substrate 3-3; the rotating device 3-4 drives the substrate 3-3 to rotate at a high speed; a wavelength conversion material is arranged in the wavelength conversion part 3-1. The structure of the rotating device 3-4 drives the substrate 3-3 to move at a high speed, so that the wavelength conversion material can be quickly scanned by the excitation light at different positions.

[0035] More specifically, the excitation light emitted by the laser light source 1 is blue light or purple light or ultraviolet light.

[0036] More specifically, a number of small mirrors and a projection display control system are arranged in the digital display light valve 4; the projection display control system controls the states of the small mirrors through binary signals.

[0037] More specifically, the small mirrors include two states of "0" and "1"; when the output signal in the projection display control system is 0, the small mirror guides the synthesized light outside the lens; when the output signal in the projection display control system is 1, the small mirror guides the synthesized light into the lens.

[0038] Embodiment 1 is as Figures 1 to 4 shown:

[0039] The utility model discloses a compact projection display system, which includes an excitation light source 1, a curved mirror 2, a wavelength conversion device 3, a digital display light valve 4, a lens 5, and a collection lens group 8. The excitation light source 1 and the wavelength conversion device 3 are respectively located on both sides of the curved mirror 2. A small hole 6 is arranged on the curved mirror 2, and the aperture is set to transmit the excitation light. The wavelength conversion device 3, the collection lens group 8, and the digital display light 4 are located on the concave side of the curved mirror 2. The collection lens group 8 is arranged between the curved mirror 2 and the wavelength conversion device 3. The excitation light source 1 is arranged on the convex side of the curved mirror 2, and the concave surface of the curved mirror 2 has a high reflectivity for visible light.

[0040] Calculated from the light emission point, along the direction of the light, in sequence are the excitation light source 1, the curved mirror 2, the collection lens group 8, the wavelength conversion device 3, the collection lens group 8, the curved mirror 2, the digital display light valve 4, and the lens 5.

[0041] The excitation light source 1 emits excitation light, which is blue light or violet light or ultraviolet light. This part of the light passes through the small hole 6 on the curved mirror 2 and is incident on the collection lens group 8. The collection lens group 8 shapes the excitation light into a converging light and is incident on the wavelength conversion device 3. The wavelength conversion device 3 converts part of the excitation light into stimulated light, and at the same time guides the un-converted excitation light. The guided excitation light and the stimulated light are collected by the collection lens group 8 and combined into the target white light. The target white light is guided to the concave surface of the curved mirror 2, and the concave surface of the curved mirror 2 shapes the target white light into a light beam with the angle required by the digital display light valve 4 and reflects and guides the light beam to the surface of the digital display light valve 4. The digital display light valve 4 decides whether to guide this part of the light to the lens device according to the signal sent by the projection control.

[0042] The curved mirror 2 is a free-form curved mirror. A small hole 6 is provided on the curved mirror 2 for transmitting the excitation light.

[0043] As Figure 2 shown, a dichroic mirror 7 can also be provided on the small hole 6, and the dichroic mirror 7 has the function of transmitting laser light and reflecting stimulated light.

[0044] When the wavelength conversion device 3 is a static device, it includes a heat sink structure 3-2 and a wavelength conversion part 3-1. The heat sink structure 3-2 includes a copper structure and a silver structure. There is a wavelength conversion material in the wavelength conversion part 3-1. The wavelength conversion material is a yellow wavelength conversion material, and its form can be a ceramic sheet or a sheet obtained by bonding powders with an adhesive. Looking from the light incident direction, in sequence are the wavelength conversion material, the silver structure, and the copper structure. The silver structure provides high thermal conductivity and high reflectivity for the wavelength reflection material. The copper structure provides a heat dissipation function for the wavelength conversion material. The copper structure can be arranged on a radiator, and the radiator is a radiator with heat dissipation fins or a liquid-cooled radiator or a semiconductor refrigeration radiator.

[0045] When the wavelength conversion device 3 is a dynamic device; the wavelength conversion device 3 includes a wavelength conversion part 3-1, a substrate 3-3, and a rotation device 3-4; the wavelength conversion part 3-1 is arranged on the substrate 3-3; the rotation device 3-4 drives the substrate 3-3 to rotate at a high speed; there is a wavelength conversion material arranged in the wavelength conversion part 3-1. The structure of the rotation device 3-4 drives the substrate 3-3 to move at a high speed, so that the wavelength conversion material can be quickly scanned by the excitation light at different positions.

[0046] When the excitation light is blue light, the wavelength conversion material only converts part of the excitation light into stimulated light, and the other part of the excitation light is not converted. The formed stimulated light and the unconverted excitation light are collected by the collection lens group and combined into the target white light.

[0047] When the excitation light is violet light or ultraviolet light with a wavelength shorter than that of blue light, the wavelength conversion material converts all of the excitation light into the target white light.

[0048] The optical axis of the lens 5 and the center of the digital display light valve 4 are approximately coincident. There are a large number of small mirrors inside the digital display light valve 4. When in use, these mirrors have two states, namely 0 and 1, and their states are controlled according to the 0 or 1 signal sent by the projection display control system. Among them, the small mirror receiving the signal "1" can guide the target white light to the lens 5, and the small mirror with the signal "0" can guide the target white light outside the optical system of the lens 5.

[0049] Embodiment 2 is as Figures 3 to 5 shown:

[0050] The present utility model provides a compact projection display system, which includes an excitation light source 1, a curved mirror 2, a wavelength conversion device 3, a dichroic mirror 7, a digital display light valve 4, a lens 2, and a collection lens group 8. The excitation light source 1, the wavelength conversion device 3, and the curved mirror 2 are respectively located on both sides of the optical axes of the digital display light valve 4 and the lens 5. The concave surface of the curved mirror 2 faces the collection lens group 8, the wavelength conversion device 3, and the digital display light valve 4. The collection lens group 8 is arranged between the curved mirror 2 and the wavelength conversion device 3, and the concave surface of the curved mirror 2 has a high reflectivity to visible light.

[0051] Calculated from the light emission point and along the direction of the light, in sequence are the excitation light source 2, the dichroic mirror 7, the collection lens group 8, the wavelength conversion device 3, the collection lens group 8, the dichroic mirror 7, the curved mirror 2, the digital display light valve 4, and the lens 5.

[0052] The excitation light source 1 emits excitation light, which is blue light or violet light or ultraviolet light. This part of the light is guided to the dichroic mirror 7, and then guided to the collection lens group 8. The collection lens group 8 reshapes the excitation light into a converging light and irradiates it onto the wavelength conversion device 3. The wavelength conversion device 3 converts part of the excitation light into stimulated light, and at the same time guides the un-converted excitation light. The guided excitation light and stimulated light are collected by the collection lens group 8 and combined into the target white light. The target white light is guided through the dichroic mirror 7 and guided to the concave surface of the curved mirror 2. The concave surface of the curved mirror 2 reshapes the target white light into a light beam with the angle required by the digital display light valve 4, and reflects and guides the light beam to the surface of the digital display light valve 4. The digital display light valve 4 decides whether to guide this part of the light to the lens 5 device according to the signal sent by the projection control. The curved mirror 2 is a parabolic mirror or a hyperbolic mirror.

[0053] When the wavelength conversion device 3 is a static device, it includes a heat sink structure 3-2 and a wavelength conversion part 3-1. The heat sink structure 3-2 includes a copper structure and a silver structure. There is a wavelength conversion material in the wavelength conversion part 3-1. The wavelength conversion material is a yellow wavelength conversion material, and its form can be a ceramic sheet or a sheet obtained by bonding powders with an adhesive. Looking from the light incident direction, they are the wavelength conversion material, the silver structure, and the copper structure in sequence. The silver structure provides high thermal conductivity and high reflectivity for the wavelength reflection material. The copper structure provides a heat dissipation function for the wavelength conversion material. The copper structure can be arranged on a radiator, and the radiator is a radiator with heat dissipation fins or a liquid-cooled radiator or a semiconductor refrigeration radiator.

[0054] When the wavelength conversion device 3 is a dynamic device; the wavelength conversion device 3 includes a wavelength conversion part 3-1, a substrate 3-3, and a rotating device 3-4; the wavelength conversion part 3-1 is arranged on the substrate 3-3; the rotating device 3-4 drives the substrate 3-3 to rotate at a high speed; there is a wavelength conversion material arranged in the wavelength conversion part 3-1. The structure of the rotating device 3-4 drives the substrate 3-3 to move at a high speed, so that the wavelength conversion material can be quickly scanned by the excitation light at different positions.

[0055] When the excitation light is blue light, the wavelength conversion material only converts part of the excitation light into stimulated light, and the other part of the excitation light is not converted. The formed stimulated light and the un-converted excitation light are collected by the collection lens group and combined into the target white light.

[0056] When the excitation light is violet light or ultraviolet light with a wavelength shorter than blue light, the wavelength conversion material converts all the excitation light into the target white light.

[0057] The optical axis of the lens 5 and the center of the digital display light valve 4 are approximately coincident. There are a large number of small mirrors inside the digital display light valve 4. When in use, these mirrors have two states, namely 0 and 1. They are controlled according to the 0 or 1 signal sent by the projection display control system. Among them, the small mirrors receiving the signal "1" can guide the target white light to the lens 5, while the small mirrors with the signal "0" can guide the target white light outside the optical system of the lens 5.

[0058] In summary, a compact projection display system provided by the present utility model includes a laser light source, a curved mirror, a wavelength conversion device, a digital display light valve and a lens; the excitation light source emits excitation light, and this part of the light is guided to a dichroic mirror or a small hole, and then guided to enter a collection lens group. The collection lens group shapes the excitation light into a converging light and enters the wavelength conversion device. The wavelength conversion device converts part of the excitation light into stimulated light, and the stimulated light is guided to the concave surface of the curved mirror. The concave surface of the curved mirror shapes the stimulated light into a light beam with an angle required by the digital display light valve and reflects and guides the light beam to the surface of the digital display light valve. The digital display light valve decides whether to guide this part of the light to the lens device according to the signal sent by the projection control; compared with the prior art, the projection display system of the present utility model uses a curved mirror to replace the curved reflector bowl, with a simpler structure and lower cost. At the same time, the optical path structure is optimized, resulting in lower energy loss in the overall optical path.

[0059] Although the content of the present utility model has been introduced in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present utility model. After those skilled in the art have read the above content, various modifications and substitutions of the present utility model will be obvious. Within the technical concept scope of the present utility model, various equivalent transformations can be made to the technical solutions of the present utility model, and these equivalent transformations all belong to the protection scope of the present utility model.

Claims

1. A compact projection display system, characterized in that: It includes a laser light source, a curved reflector, a wavelength conversion device, a digital display light valve and a lens; The laser light source is used to provide the excitation light required by the system; The wavelength conversion device is used to convert the excitation light emitted by the laser light source into stimulated light of a specified wavelength for emission; The curved reflector is used to reflect the stimulated light to the digital display light valve; The digital display light valve controls the stimulated light to enter the lens; The incident light path includes the excitation light emitted by the laser light source passing through the curved reflector and then falling into the wavelength conversion device; the outgoing light path includes the stimulated light passing through the curved reflector and then entering the digital display light valve; after receiving the stimulated light, the digital display light valve emits the stimulated light to the lens according to the requirements of the projection system.

2. A compact projection display system as claimed in claim 1, characterized in that: The curved reflector is provided with a small hole and / or a dichroic mirror; the curved reflector is a parabolic reflector, a hyperbolic reflector or a free-form reflector.

3. A compact projection display system as claimed in claim 2, characterized in that: The dichroic mirror and the curved reflector can be separately arranged or integrally formed.

4. A compact projection display system as claimed in claim 2, characterized in that: The excitation light emitted by the laser light source reaches the wavelength conversion device after passing through the pinhole and / or the dichroic mirror; the concave surface of the curved reflector faces the wavelength conversion device; the stimulated light is emitted from the wavelength conversion device and enters the digital display light valve through reflection from the concave surface of the curved reflector.

5. A compact projection display system as claimed in claim 1, characterized in that: A collecting lens group is arranged before the wavelength conversion device; the collecting lens group is used to converge the excitation light on the wavelength conversion device and diffusely emit the excited light to the curved reflector.

6. A compact projection display system as claimed in claim 1, characterized in that: The wavelength conversion device is a static device; the wavelength conversion device comprises a wavelength conversion part and a heat sink structure part; the wavelength conversion part is filled with a wavelength conversion material; the heat sink structure part is provided with a material with high thermal conductivity and high reflectivity.

7. A compact projection display system as claimed in claim 6, characterized in that: The wavelength conversion material is a yellow light wavelength conversion material; the heat sink structure is a double-layer structure; one layer of the heat sink structure is a silver structure with high thermal conductivity and high reflectivity, and the other layer is a copper structure for heat dissipation.

8. A compact projection display system as claimed in claim 1, characterized in that: It also includes a heat dissipation component; the heat dissipation component is connected to the wavelength conversion device; the heat dissipation component is a radiator with heat dissipation fins or a liquid cooling radiator or a semiconductor refrigeration radiator.

9. A compact projection display system as claimed in claim 1, characterized in that: The wavelength conversion device is a dynamic device; the wavelength conversion device comprises a wavelength conversion part, a substrate and a rotating device; the wavelength conversion part is arranged on the substrate; the rotating device drives the substrate to rotate at high speed; and a wavelength conversion material is arranged in the wavelength conversion part.

10. A compact projection display system as claimed in claim 1, characterized in that: The excitation light emitted by the laser light source is blue light, purple light or ultraviolet light.

11. A compact projection display system as claimed in claim 1, characterized in that: A plurality of small reflectors and a projection display control system are arranged in the digital display light valve; the projection display control system controls the state of the small reflectors through binary signals.

12. A compact projection display system as claimed in claim 11, characterized in that: The small reflector includes two states, "0" and "1"; when the output signal in the projection display control system is 0, the small reflector guides the synthesized light out of the lens; when the output signal in the projection display control system is 1, the small reflector guides the synthesized light into the lens.

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