Light path structure of LCOS projection light machine using laser dual-fluorescent ceramic light source

Abstract

The invention provides a light path structure of an LCOS projection light machine using a laser dual-fluorescent ceramic light source, which is applied to the technical field of projection display, and is characterized in that blue exciting light is converted into green light and red light through static copper substrate green fluorescent ceramic and static copper substrate red fluorescent ceramic, blue laser is supplemented through a blue laser light source, and the light path structure of the LCOS projection light machine is obtained. The high-brightness red light, green light and blue laser can be incident to the LCOS through conversion and processing of the polarization processing optical group, the liquid crystal light valve optical group, the polarization light splitting element and the like, and then is emitted from the projection lens after being modulated by the LCOS; the projection light machine has the technical effects that wavelength conversion can be stably carried out on exciting light, the energy utilization rate of blue exciting light is improved, and the luminous flux of the fluorescent ceramic light source is improved, so that the output luminous flux of the projection light machine is improved; and moreover, the projection picture of the projection light machine has the characteristic of high brightness, and the projection light machine can also perform clear imaging in a bright environment, so that the problem that the picture is not clear when the projection light machine is used in the bright environment is solved.

Description

Technical Field

[0001] The present invention relates to the field of projection display technology, and in particular to an optical path structure of an LCOS projection optical machine using a laser dual fluorescent ceramic light source. Background Art

[0002] Projector optical machine refers to the core component that converts input signals into images, including light source, lens group, optical engine and imaging element. Its function is to convert input signals into projected images through optical technology. With the continuous development of optical projection technology, projector optical machine is becoming an indispensable tool for people's work, study and life. Among them, laser light source is a commonly used light source type for projector optical machine, which has the advantages of high brightness, wide color gamut and vivid image. Its disadvantage is that the highly coherent laser will produce speckle phenomenon when reflected on the projection surface, affecting the perception. Using short-wavelength laser to excite fluorescence and then combining fluorescence with three-color laser is a common technical means to supplement brightness and reduce laser speckle. At present, a Chinese invention with publication number CN117850141A discloses a wavelength conversion device, a light source system and a projection device, including a driving device, a substrate, a wavelength conversion element and a diffusion element, wherein: the driving device is transmission-connected to the substrate, and the driving device is configured to drive the substrate to rotate around its axis; the diffusion element is arranged on the substrate, and the diffusion element is in a circular ring shape; the wavelength conversion element is arranged on the substrate in a circular ring shape, and the wavelength conversion element is arranged on the inner side of the diffusion element, or the wavelength conversion element is arranged on the outer side of the diffusion element, and the center of the diffusion element, the center of the substrate and the center of the wavelength conversion element correspond to each other, and the wavelength conversion device converts the wavelength of the excitation light through the wavelength conversion element to obtain the converted light.

[0003] In existing projection equipment, a driving device drives the substrate and drives the wavelength conversion element to rotate. The rotating wavelength conversion element converts the wavelength of the excitation light. However, the rotating wavelength conversion element is unstable and easily interfered by external factors. For example, vehicle-mounted projectors are mostly used when the vehicle is moving. The bumps of the vehicle will interfere with the rotation of the wavelength conversion element, thereby affecting the wavelength conversion of the excitation light by the wavelength conversion element. Summary of the invention

[0004] The purpose of the present invention is to provide an optical path structure of an LCOS projection optical machine using a laser dual fluorescent ceramic light source, which has the advantage of being able to stably convert the wavelength of the excitation light, improve the energy utilization rate of the blue excitation light, and increase the luminous flux of the fluorescent ceramic light source, thereby increasing the output luminous flux of the projection optical machine.

[0005] To achieve the above objectives and other related objectives, the present invention provides the following technical solutions: An optical path structure of an LCOS projection optical machine using a laser dual fluorescent ceramic light source, characterized in that: A blue excitation light source array, the blue excitation light source array is used to emit blue excitation light; a blue laser light source, the blue laser light source is used to emit blue laser; A wavelength conversion optical element, wherein a focusing collimating lens optical group is arranged between the blue excitation light source array and the wavelength conversion optical element, and the focusing collimating lens optical group is used to focus the blue excitation light on the wavelength conversion optical element; the wavelength conversion optical element comprises a static copper-based green fluorescent ceramic and a static copper-based red fluorescent ceramic, and the blue excitation light is converted into green light by the static copper-based green fluorescent ceramic, and then converted into red light by the static copper-based red fluorescent ceramic, and then emitted, collimated and expanded after passing through the focusing collimating lens optical group; A polarization processing optical group, wherein the polarization processing optical group is used to convert green light, red light and blue laser light into polarized light with the same polarization direction respectively; A liquid crystal light valve optical group, which is used to control the passage or cutoff of red light, green light and blue laser, or to adjust the amount of light energy transmitted; A polarization beam splitter element, which is used to reflect red light, green light, and blue laser light in a vertical polarization direction and transmit red light, green light, and blue laser light in a horizontal polarization direction; LCOS, the LCOS is used to modulate the polarization state of red light, green light, and blue laser light in the same polarization direction and then reflect them to the projection lens.

[0006] In one embodiment of the present invention, it further includes a collimating lens array for collimating the blue excitation light, a first dichroic mirror for reflecting part of the blue excitation light and transmitting part of the blue excitation light and green light, and a second dichroic mirror for reflecting the blue excitation light and transmitting the red light; The collimating lens array is arranged opposite to the blue excitation light source array, the first dichroic mirror is arranged opposite to the collimating lens array, and the second dichroic mirror is arranged opposite to the first dichroic mirror.

[0007] In one embodiment of the present invention, the focusing collimating lens optical group includes a first focusing collimating lens group and a second focusing collimating lens group; the first focusing collimating lens group is located between the static copper substrate green fluorescent ceramic and the first dichroic mirror; The second focusing and collimating lens group is located between the static copper-based red fluorescent ceramic and the second dichroic mirror.

[0008] In one embodiment of the present invention, the polarization processing optical set includes a first linear polarizer, a second linear polarizer, and a third linear polarizer; The first linear polarizer is disposed opposite to the first dichroic mirror, and the second linear polarizer is disposed opposite to the second dichroic mirror.

[0009] In an embodiment of the present invention, the liquid crystal light valve optical group includes a first liquid crystal light valve, a second liquid crystal light valve, and a third liquid crystal light valve; The first liquid crystal light valve is disposed opposite to the first linear polarizer, and the second liquid crystal light valve is disposed opposite to the second linear polarizer.

[0010] In an embodiment of the present invention, it further includes a collimating and beam expanding lens group for collimating and beam expanding the blue laser to a required size. The collimating and beam expanding lens group is disposed opposite to the blue laser light source, the third linear polarizer is disposed opposite to the collimating and beam expanding lens group, and the third liquid crystal light valve is disposed opposite to the third linear polarizer.

[0011] In an embodiment of the present invention, it further includes a third dichroic mirror for reflecting green light and transmitting blue laser, and a fourth dichroic mirror for reflecting red light and transmitting green light and blue laser; The third dichroic mirror is disposed opposite to the first liquid crystal light valve and the third liquid crystal light valve, and the fourth dichroic mirror is disposed opposite to the second liquid crystal light valve and the third dichroic mirror.

[0012] In an embodiment of the present invention, it further includes a reflector, a microlens array, and a relay lens group; The reflector is disposed opposite to the fourth dichroic mirror, the microlens array is disposed opposite to the reflector, and the relay lens group is disposed opposite to the microlens array.

[0013] In an embodiment of the present invention, the polarization splitting element is a polarization splitting prism. The polarization splitting prism is disposed opposite to the relay lens group, and a compensation film is disposed between the polarization splitting prism and the LCOS.

[0014] As described above, the optical path structure of an LCOS projection optical machine using a laser double fluorescence ceramic light source according to the present invention has the following beneficial effects: 1. The wavelength conversion optical element includes a static copper substrate green fluorescence ceramic and a static copper substrate red fluorescence ceramic. The static copper substrate green fluorescence ceramic and the static copper substrate red fluorescence ceramic have higher stability compared with the dynamic wavelength conversion elements in the prior art; and both the static copper substrate green fluorescence ceramic and the static copper substrate red fluorescence ceramic are copper substrate fluorescence ceramics. The copper substrate fluorescence ceramic has good laser resistance and heat dissipation performance, can improve the laser damage threshold of the phosphor, reduce the thermal quenching effect, and improve the utilization rate of blue excitation light converted into red light or green light; and because the copper substrate fluorescence ceramic has good laser resistance and heat dissipation performance, the light energy of the blue excitation light can be increased by increasing the number of blue excitation light sources in the blue excitation light source array and increasing the energy of a single blue excitation light source, and then the copper substrate fluorescence ceramic can convert high-energy red light and green light; 2. The dual phosphor light source used in the present invention has the following advantages: first, it does not require the color separation optical components in the single phosphor solution or the color wheel in the dynamic phosphor solution, and has a simple structure; second, in the spectrum emitted by the static single phosphor or the dynamic phosphor, the red light energy accounts for a relatively low proportion. When red, green and blue light are used to synthesize white light, the three colors of light need to have a specific proportion; insufficient red light will limit the power usage of green and blue light, resulting in limited output brightness of the optical machine; and the dual phosphor light source used in the present invention generates green and red light respectively, which can generate higher red and green light energy output. When red, green and blue light are synthesized into white light, the use of green and blue energy will not be limited due to insufficient red light energy; therefore, the output brightness of the projection optical machine can reach a higher level.

[0015] 3. The present invention uses a liquid crystal light valve as a switch to control the on and off of the red, green and blue light paths, and can also adjust the energy of the red, green and blue light transmission through the liquid crystal light valve; in combination with a static phosphor, the rotating device in the system is eliminated, so that the entire system has a higher structural reliability, and is suitable for vehicle-mounted, airborne and other application fields with high reliability requirements; 4. The blue excitation light is converted into green light and red light through the static copper-based green fluorescent ceramic and the static copper-based red fluorescent ceramic, and the blue laser is supplemented by the blue laser light source. The polarization processing optical group converts the red light, green light and blue laser into linear polarized light. The liquid crystal light valve optical group is used to control the passage or cutoff of red light, green light and blue laser, and can also control the energy of the transmitted light. The polarization beam splitter element reflects the red light, green light, blue laser and other light in the same polarization direction. The conversion and processing can make high-brightness red light, green light and blue laser incident on LCOS, and then emit from the projection lens after being modulated by LCOS, so that the projection light machine projects the picture with the characteristics of high brightness, and the projection light machine can also form clear images in bright environments, thereby solving the problem of unclear pictures when the projection light machine is used in bright environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall optical path structure of an embodiment of the present invention.

[0017] Reference numerals: 1. Blue excitation light source array; 2. Blue laser light source; 3. Collimating lens array; 4. Collimating and beam expanding lens group; 5. First dichroic mirror; 6. Second dichroic mirror; 7. First focusing and collimating lens group; 8. Second focusing and collimating lens group; 9. Static copper substrate green fluorescent ceramic; 10. Static copper substrate red fluorescent ceramic; 11. First linear polarizer; 12. Second linear polarizer; 13. Third linear polarizer; 14. First liquid crystal light valve; 15. Second liquid crystal light valve; 16. Third liquid crystal light valve; 17. Third dichroic mirror; 18. Fourth dichroic mirror; 19. Reflecting mirror; 20. Microlens array; 21. Relay lens group; 22. Polarization beam splitting element; 23. Compensation film; 24. LCOS; 25. Projection lens. Detailed implementation manners

[0018] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0019] Please refer to Figure 1 . It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of clear description and are not used to limit the scope under which the present invention can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope under which the present invention can be implemented.

[0020] Please refer to Figure 1 , the present invention provides an optical path structure of an LCOS projection optical machine using a laser double fluorescent ceramic light source, including a blue excitation light source array 1, a blue laser light source 2, a wavelength conversion optical element, a focusing and collimating lens optical group, a polarization processing optical group, a liquid crystal light valve optical group, a polarization beam splitting element 22, an LCOS 24 (Liquid Crystal on Silicon), and a projection lens 25; Among them, the blue excitation light source array 1 is used to emit blue excitation light, and the blue laser light source 2 is used to emit blue laser light. In this embodiment, the blue laser light source 2 is a blue laser diode or a blue laser diode array, and the blue excitation light source array 1 is a blue laser diode array composed of several blue laser diodes; A blue excitation light source array 1 is oppositely provided with a collimating lens array 3. Each blue laser diode in the blue excitation light source array 1 corresponds to a collimating lens. The blue excitation light emitted by the blue excitation light source array 1 passes through the collimating lens array 3, and the collimating lens array 3 is used to collimate the blue excitation light.

[0021] Please refer to Figure 1 , the wavelength conversion optical element includes a static copper substrate green fluorescent ceramic 9 and a static copper substrate red fluorescent ceramic 10. The focusing and collimating lens optical group includes a first focusing and collimating lens group 7 and a second focusing and collimating lens group 8; the static copper substrate green fluorescent ceramic 9 is oppositely arranged with the first focusing and collimating lens group 7, and the static copper substrate red fluorescent ceramic 10 is oppositely arranged with the second focusing and collimating lens group 8; a first dichroic mirror 5 is oppositely arranged with the first focusing and collimating lens group 7, and a second dichroic mirror 6 is oppositely arranged with the second focusing and collimating lens group 8, wherein the first dichroic mirror 5 is oppositely arranged with the collimating lens array 3, and the second dichroic mirror 6 is oppositely arranged with the first dichroic mirror 5; The blue excitation light source array 1 emits blue excitation light. The collimating lens array 3 is used to collimate the blue excitation light. The collimated blue excitation light is incident on the first dichroic mirror 5. The first dichroic mirror 5 reflects part of the blue excitation light onto the first focusing and collimating lens group 7. The first focusing and collimating lens group 7 is used to focus the blue excitation light on the static copper substrate green fluorescent ceramic 9. The blue excitation light is converted into green light by the static copper substrate green fluorescent ceramic 9 and reflected to the first focusing and collimating lens group 7 for collimation. The collimated green light is transmitted through the first dichroic mirror 5; The first dichroic mirror 5 is also used to transmit part of the blue excitation light. The blue excitation light transmitted through the first dichroic mirror 5 is incident on the second dichroic mirror 6. The second dichroic mirror 6 reflects part of the blue excitation light onto the second focusing and collimating lens group 8. The second focusing and collimating lens group 8 is used to focus the blue excitation light on the static copper substrate red fluorescent ceramic 10. The blue excitation light is converted into red light by the static copper substrate red fluorescent ceramic 10 and reflected to the second focusing and collimating lens group 8 for collimation. The collimated red light is transmitted through the second dichroic mirror 6.

[0022] Please refer to Figure 1 , the polarization processing optical group is used to convert green light, red light, and blue laser into linearly polarized light with the same polarization direction respectively. The polarization processing optical group includes a first linear polarizer 11, a second linear polarizer 12, and a third linear polarizer 13, wherein the first linear polarizer 11, the second linear polarizer 12, and the third linear polarizer 13 are polarizers with the same structure; the first linear polarizer 11 is oppositely arranged with the first dichroic mirror 5, and the second linear polarizer 12 is oppositely arranged with the second dichroic mirror 6; The liquid crystal light valve optical group is used to control the presence, absence, or size of the red light, green light, and blue laser passing through the light beam; the liquid crystal light valve optical group includes a first liquid crystal light valve 14, a second liquid crystal light valve 15, and a third liquid crystal light valve 16; The first liquid crystal light valve 14 is disposed opposite to the first linear polarizer 11, and the second liquid crystal light valve 15 is disposed opposite to the second linear polarizer 12.

[0023] A collimating and beam expanding lens group 4 is disposed opposite to the blue laser light source 2, a third linear polarizer 13 is disposed opposite to the collimating and beam expanding lens group 4, and a third liquid crystal light valve 16 is disposed opposite to the third linear polarizer 13; A third dichroic mirror 17 is disposed opposite to the first liquid crystal light valve 14, and the third dichroic mirror 17 is also disposed opposite to the third liquid crystal light valve 16. A fourth dichroic mirror 18 is disposed opposite to the second liquid crystal light valve 15, and the fourth dichroic mirror 18 is also disposed opposite to the third dichroic mirror 17. A reflecting mirror 19 is disposed opposite to the fourth dichroic mirror 18; The green light transmitted through the first dichroic mirror 5 is incident on the first linear polarizer 11. The first linear polarizer 11 is used to filter the light in the green light whose polarization direction is different from its polarization axis direction, and only allows the green light parallel to the polarization axis direction of the first linear polarizer 11 to pass through. The green light transmitted through the first linear polarizer 11 is incident on the first liquid crystal light valve 14. The first liquid crystal light valve 14 is used to control the presence, absence or size of the green light passing through the light beam. The green light transmitted through the first liquid crystal light valve 14 is incident on the third dichroic mirror 17. The third dichroic mirror 17 reflects the green light to the fourth dichroic mirror 18, and the fourth dichroic mirror 18 transmits the green light to the reflecting mirror 19; The red light transmitted through the second dichroic mirror 6 is incident on the second linear polarizer 12. The second polarizer is used to filter the light in the red light whose polarization direction is different from its polarization axis direction, and only allows the red light parallel to the polarization axis direction of the second linear polarizer 12 to pass through. The red light transmitted through the second linear polarizer 12 is incident on the second liquid crystal light valve 15. The second liquid crystal light valve 15 is used to control the presence, absence or size of the red light passing through the light beam. The red light transmitted through the second liquid crystal light valve 15 is incident on the fourth dichroic mirror 18. The fourth dichroic mirror 18 reflects the red light to the reflecting mirror 19; The blue laser light source 2 emits blue laser light. The blue laser light is collimated and expanded to the required size by the collimating and beam expanding lens group 4 and then incident on the third linear polarizer 13. The main polarization direction of the blue laser light emitted by the blue laser light source 2 is set to be the same as the polarization axis direction of the third linear polarizer 13. The third polarizer is used to filter the light in the blue laser whose polarization direction is different from its polarization axis direction, and only allows the blue laser parallel to the polarization axis direction of the third linear polarizer 13 to pass through. The blue laser transmitted through the third linear polarizer 13 is incident on the third liquid crystal light valve 16. The third liquid crystal light valve 16 is used to control the presence, absence or size of the blue laser passing through the light beam. The blue laser transmitted through the third liquid crystal light valve 16 is incident on the third dichroic mirror 17. The third dichroic mirror 17 is used to transmit the blue laser to the fourth dichroic mirror 18, and the fourth dichroic mirror 18 is used to transmit the blue laser to the reflecting mirror 19.

[0024] Please refer toFigure 1 , a microlens array 20 is disposed opposite to the mirror 19. The red light, green light or blue laser incident on the mirror 19 is reflected by the mirror 19 to the microlens array 20. The microlens array 20 is used to uniform the light spot, so as to make the brightness of the projection image projected by the projection lens 25 uniform. A relay lens group 21 is disposed opposite to the microlens array 20. The relay lens group 21 is used to focus the light beam passing through the microlens array 20 onto the surface of the LCOS 24. The polarization beam splitter 22 is disposed opposite to the relay lens group 21. The polarization beam splitter 22 in this embodiment is a polarization beam splitting prism. The polarization beam splitting prism is used to separate the horizontal polarization and vertical polarization of a beam of light (red light, green light or blue laser), that is, it is divided into S-polarized light and P-polarized light. The polarization beam splitting prism reflects the S-polarized light and transmits the P-polarized light. A compensator 23 is disposed opposite to the polarization beam splitting prism. The compensator 23 in this embodiment can be an achromatic quarter-wave plate, which is used to compensate for the phase deviation caused by the pretilt angle of the liquid crystal molecules in the LCOS 24, so as to improve the contrast of the image output by the optical engine. The compensator 23 is disposed opposite to the LCOS 24. The projection lens 25 is disposed on one side of the polarization beam splitting prism away from the compensator 23. The projection lens 25 is disposed opposite to the polarization beam splitting prism. The light beam (red light, green light or blue laser) is incident on the LCOS 24 after being compensated by the compensator 23. The LCOS 24 modulates the polarization state of the light incident on each pixel point thereon and reflects and exits. The reflected light passes through the polarization beam splitting prism. Since the polarization beam splitting prism transmits the P-polarized light and reflects the S-polarized light, the intensity of the light exiting from each pixel point of the LCOS 24 can be controlled. The intensity of the light exiting from each pixel is different to form an image, and finally the image is projected by the projection lens 25.

[0025] In summary, the static copper-based green fluorescent ceramic 9 and the static copper-based red fluorescent ceramic 10 in the present invention have higher stability compared with the dynamic wavelength conversion elements in the prior art. Moreover, both the static copper-based green fluorescent ceramic 9 and the static copper-based red fluorescent ceramic 10 are copper-based fluorescent ceramics. The copper-based fluorescent ceramics have good laser resistance and heat dissipation performance, can reduce the thermal quenching effect of the fluorescent ceramics, and improve the utilization rate of blue excitation light converted into red light or green light. The present invention uses the static copper-based green fluorescent ceramic 9 to generate green light, the static copper-based red fluorescent ceramic 10 to generate red light, and the blue laser light source 2 to generate blue light, without using the color separation optical components such as the rotating color wheel or X prism commonly used in the traditional laser fluorescence light source projection optical engine. The structure of the present invention is simpler and the structural reliability is higher. In addition, the static copper substrate green fluorescent ceramic 9 and the static copper substrate red fluorescent ceramic 10 used in the present invention can respectively generate higher green light and red light energy outputs when excited by blue excitation light. When synthesizing white light from red, green, and blue lights, the use of green and blue energies will not be restricted due to insufficient red light energy. Therefore, the output brightness of the present invention can reach a higher level; thus, the projection image of the projection optical machine has the characteristic of high brightness, and the projection optical machine can also clearly image in a bright environment, thereby solving the problem that the projection image of the projection optical machine is not clear when used in a bright environment.

[0026] Finally, the present invention uses a liquid crystal light valve as a switch to control the on-off of the red, green, and blue light paths, and at the same time, the liquid crystal light valve can be used to adjust the energy size of the red, green, and blue lights passing through; in cooperation with the static phosphor, the rotating device in the system is eliminated, making the entire system have higher structural reliability and solving the problem that the optical machines with dynamic phosphor light sources and the optical machines with rotating color wheels cannot be applied to application scenarios with high reliability requirements such as vehicle-mounted and airborne.

[0027] The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. An optical path structure of an LCOS projection optical machine using a laser double-fluorescent ceramic light source, characterized in that: including a blue excitation light source array (1) for emitting blue excitation light; a blue laser light source (2) for emitting blue laser light; a wavelength conversion optical element, a focusing and collimating lens optical group is arranged between the blue excitation light source array (1) and the wavelength conversion optical element, and the focusing and collimating lens optical group is used to focus the blue excitation light on the wavelength conversion optical element; the wavelength conversion optical element includes a static copper substrate green fluorescent ceramic (9) and a static copper substrate red fluorescent ceramic (10), and the blue excitation light is converted into green light by the static copper substrate green fluorescent ceramic (9) and into red light by the static copper substrate red fluorescent ceramic (10), and then emits out and is collimated and expanded by the focusing and collimating lens optical group; a polarization processing optical group for converting green light, red light, and blue laser light into polarized light with the same polarization direction respectively; a liquid crystal light valve optical group for controlling the passing or blocking of red light, green light, and blue laser light, or adjusting the magnitude of the transmitted light energy; a polarization beam splitter element (22) for reflecting red light, green light, and blue laser light with a vertical polarization direction and transmitting red light, green light, and blue laser light with a horizontal polarization direction; an LCOS (24) for modulating the polarization state of red light, green light, and blue laser light with the same polarization direction and then reflecting it to a projection lens (25).

2. The optical path structure of an LCOS projection optical machine using a laser double-fluorescent ceramic light source according to claim 1, wherein: It further includes a collimating lens array (3) for collimating blue excitation light, a first dichroic mirror (5) for reflecting part of the blue excitation light and transmitting part of the blue excitation light and green light, and a second dichroic mirror (6) for reflecting blue excitation light and transmitting red light; the collimating lens array (3) is oppositely arranged with the blue excitation light source array (1), the first dichroic mirror (5) is oppositely arranged with the collimating lens array (3), and the second dichroic mirror (6) is oppositely arranged with the first dichroic mirror (5).

3. The optical path structure of an LCOS projection optical machine using a laser double-fluorescent ceramic light source according to claim 2, characterized in that: the focusing and collimating lens optical group includes a first focusing and collimating lens group (7) and a second focusing and collimating lens group (8); the first focusing and collimating lens group (7) is located between the static copper substrate green fluorescent ceramic (9) and the first dichroic mirror (5); the second focusing and collimating lens group (8) is located between the static copper substrate red fluorescent ceramic (10) and the second dichroic mirror (6).

4. The optical path structure of an LCOS projection optical machine using a laser double-fluorescent ceramic light source according to claim 3, characterized in that: the polarization processing optical group includes a first linear polarizer (11), a second linear polarizer (12), and a third linear polarizer (13); the first linear polarizer (11) is oppositely arranged with the first dichroic mirror (5), and the second linear polarizer (12) is oppositely arranged with the second dichroic mirror (6).

5. The optical path structure of an LCOS projection optical machine using a laser double-fluorescent ceramic light source according to claim 4, characterized in that: the liquid crystal light valve optical group includes a first liquid crystal light valve (14), a second liquid crystal light valve (15), and a third liquid crystal light valve (16); the first liquid crystal light valve (14) is oppositely arranged with the first linear polarizer (11), and the second liquid crystal light valve (15) is oppositely arranged with the second linear polarizer (12).

6. The optical path structure of an LCOS projection optical machine using a laser double-fluorescent ceramic light source according to claim 5, characterized in that: It further includes a collimating and beam expanding lens group (4) for collimating and expanding the blue laser to a required size. The collimating and beam expanding lens group (4) is disposed opposite to the blue laser light source (2). The third linear polarizer (13) is disposed opposite to the collimating and beam expanding lens group (4), and the third liquid crystal light valve (16) is disposed opposite to the third linear polarizer (13).

7. The optical path structure of an LCOS projection optical machine using a laser double-fluorescent ceramic light source according to claim 6, characterized in that: It further includes a third dichroic mirror (17) for reflecting green light and transmitting blue laser, and a fourth dichroic mirror (18) for reflecting red light and transmitting green light and blue laser; The third dichroic mirror (17) is disposed opposite to the first liquid crystal light valve (14) and the third liquid crystal light valve (16). The fourth dichroic mirror (18) is disposed opposite to the second liquid crystal light valve (15) and the third dichroic mirror (17).

8. The optical path structure of an LCOS projection optical machine using a laser double-fluorescent ceramic light source according to claim 7, characterized in that: It further includes a reflecting mirror (19), a microlens array (20) and a relay lens group (21); The reflecting mirror (19) is disposed opposite to the fourth dichroic mirror (18). The microlens array (20) is disposed opposite to the reflecting mirror (19). The relay lens group (21) is disposed opposite to the microlens array (20).

9. The optical path structure of an LCOS projection optical machine using a laser double-fluorescent ceramic light source according to claim 8, characterized in that: The polarization splitting element (22) is a polarization splitting prism. The polarization splitting prism is disposed opposite to the relay lens group (21). A compensating sheet (23) is disposed between the polarization splitting prism and the LCOS (24).

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