Optical path structure of an LCOS projector using a laser dual-fluorescent ceramic light source

Abstract

The present invention provides an optical path structure of an LCOS projector using a laser dual-fluorescent ceramic light source, which is applied in the field of projection display technology. The key points of the technical solution are: blue excitation light is converted into green light and red light through a static copper-based green fluorescent ceramic and a static copper-based red fluorescent ceramic, the blue laser is supplemented by a blue laser light source, and then high-brightness red light, green light and blue laser are incident on the LCOS through conversion and processing by a polarization processing optical group, a liquid crystal light valve optical group, a polarization beam splitting element, etc., and then emitted from the projection lens after modulation by the LCOS. The technical effect is that the wavelength of the excitation light can be stably converted, the energy utilization rate of the blue excitation light is improved, the luminous flux of the fluorescent ceramic light source is increased, and thus the output luminous flux of the projector is increased; and the projection image of the projector has the characteristic of high brightness, and the projector can also form clear images in a bright environment, thereby solving the problem of unclear images when the projector is used in a bright environment.

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] The projector optical engine refers to the core component that converts the input signal into an image, and includes components such as the light source, lens group, optical engine and imaging element. Its function is to convert the input signal into a projected image through optical technology. With the continuous development of optical projection technology, projector optical engines are becoming an indispensable and important tool for people's work, study and life. Among them, laser light source is a commonly used light source type for projector optical engines, with the advantages of high brightness, wide color gamut and vivid images. Its disadvantage is that the highly coherent laser will produce speckle when reflected on the projection surface, affecting the viewing experience. Using short-wavelength laser to excite fluorescence and then combining the fluorescence with three-color laser light is a common technical means to supplement brightness and reduce laser speckle.

[0003] At present, the 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 connected to the substrate in a transmission manner, 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.

[0004] 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 with by external factors. For example, in-vehicle projectors are mostly used while the vehicle is moving. The bumps of the vehicle will interfere with the rotation of the wavelength conversion element, thereby affecting the wavelength conversion element of the excitation light. Summary of the Invention

[0005] The purpose of the present invention is to provide an optical path structure of an LCOS projector 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 projector.

[0006] To achieve the above-mentioned and other related purposes, the present invention provides the following technical solutions:

[0007] An optical path structure of an LCOS projection optical machine using a laser dual fluorescent ceramic light source, characterized by:

[0008] a blue excitation light source array, the blue excitation light source array being used to emit blue excitation light; a blue laser light source, the blue laser light source being used to emit blue laser light;

[0009] A wavelength conversion optical element is provided with a focusing collimating lens optical group between the blue excitation light source array and the wavelength conversion optical element. 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 includes a static copper-based green fluorescent ceramic and a static copper-based red fluorescent ceramic. 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. The blue excitation light is then emitted and collimated and expanded after passing through the focusing collimating lens optical group.

[0010] 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;

[0011] A liquid crystal light valve optical group, which is used to control the passage or cutoff of red light, green light, and blue laser light, or to adjust the amount of light energy transmitted;

[0012] a polarization beam splitter element configured 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;

[0013] 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.

[0014] In one embodiment of the present invention, the device further includes a collimating lens array for collimating the blue excitation light, a first dichroic mirror for reflecting a portion of the blue excitation light and transmitting a portion of the blue excitation light and green light, and a second dichroic mirror for reflecting the blue excitation light and transmitting red light.

[0015] 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.

[0016] 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 base green fluorescent ceramic and the first dichroic mirror;

[0017] The second focusing and collimating lens group is located between the static copper-based red fluorescent ceramic and the second dichroic mirror.

[0018] In one embodiment of the present invention, the polarization processing optical assembly includes a first linear polarizer, a second linear polarizer, and a third linear polarizer;

[0019] 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.

[0020] In one 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;

[0021] 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.

[0022] In one embodiment of the present invention, a collimating and beam expanding lens group is further included for collimating and expanding the blue laser to a desired size. The collimating and beam expanding lens group is arranged opposite to the blue laser light source, the third linear polarizer is arranged opposite to the collimating and beam expanding lens group, and the third liquid crystal light valve is arranged opposite to the third linear polarizer.

[0023] In one embodiment of the present invention, the optical fiber further comprises a third dichroic mirror for reflecting green light and transmitting blue laser light, and a fourth dichroic mirror for reflecting red light and transmitting green light and blue laser light.

[0024] 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.

[0025] In one embodiment of the present invention, it further includes a reflector, a micro lens array, and a relay lens group;

[0026] The reflecting mirror is arranged opposite to the fourth dichroic mirror, the microlens array is arranged opposite to the reflecting mirror, and the relay lens group is arranged opposite to the microlens array.

[0027] In one embodiment of the present invention, the polarization beam splitting element is a polarization beam splitting prism. The polarization beam splitting prism is disposed opposite to the relay lens assembly. A compensation plate is disposed between the polarization beam splitting prism and the LCOS.

[0028] As described above, the optical path structure of an LCOS projection optical machine using a laser dual-fluorescent ceramic light source of the present invention has the following beneficial effects:

[0029] 1. The wavelength conversion optical element includes a static copper-based green fluorescent ceramic and a static copper-based red fluorescent ceramic. The static copper-based green fluorescent ceramic and the static copper-based red fluorescent ceramic have higher stability than the dynamic wavelength conversion elements in the prior art. Moreover, the static copper-based green fluorescent ceramic and the static copper-based red fluorescent ceramic are both copper-based fluorescent ceramics. The copper-based fluorescent ceramics have good laser resistance and heat dissipation performance, which can increase the laser damage threshold of the phosphor, reduce the thermal quenching effect, and increase the utilization rate of blue excitation light converted into red or green light. Moreover, due to the good laser resistance and heat dissipation performance of the copper-based fluorescent ceramic, 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, thereby enabling the copper-based fluorescent ceramic to convert high-energy red and green light.

[0030] 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 the structure is simple; second, in the spectrum emitted by a static single phosphor or a dynamic phosphor, the proportion of red light energy is relatively low. When red light, green light, 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 light and blue light, resulting in limited output brightness of the optical machine; the dual-phosphor light source used in the present invention generates green light 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.

[0031] 3. This invention uses liquid crystal light valves as switches to control the red, green, and blue light paths. They also regulate the energy levels of the red, green, and blue light transmitted through them. Combined with static phosphors, this eliminates the need for rotating devices in the system, enhancing the overall system's structural reliability and making it suitable for applications requiring high reliability, such as in-vehicle and airborne applications.

[0032] 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 linearly 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 splitting 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 be emitted 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 clearly form an image in a bright environment, thereby solving the problem of unclear picture when the projection light machine is used in a bright environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall optical path structure of an embodiment of the present invention.

[0034] Figure numerals: 1. blue excitation light source array; 2. blue laser light source; 3. collimating lens array; 4. collimating beam expanding lens group; 5. first dichroic mirror; 6. second dichroic mirror; 7. first focusing collimating lens group; 8. second focusing collimating lens group; 9. static copper base green fluorescent ceramic; 10. static copper base 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. reflector; 20. microlens array; 21. relay lens group; 22. polarization splitter; 23. compensation plate; 24. LCOS; 25. projection lens. DETAILED DESCRIPTION

[0035] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0036] See also Figure 1 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0037] See also Figure 1 The present invention provides an optical path structure of an LCOS projection optical machine using a laser dual-fluorescent ceramic light source, comprising a blue excitation light source array 1, a blue laser light source 2, a wavelength conversion optical element, a focusing collimating lens optical group, a polarization processing optical group, a liquid crystal light valve optical group, a polarization beam splitter element 22, an LCOS 24 (Liquid Crystal on Silicon), and a projection lens 25;

[0038] 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 a plurality of blue laser diodes.

[0039] A collimating lens array 3 is arranged opposite to the blue excitation light source array 1, wherein each blue laser diode in the blue excitation light source array 1 corresponds to a collimating lens. The blue excitation light source array 1 emits blue excitation light through the collimating lens array 3, and the collimating lens array 3 is used to collimate the blue excitation light.

[0040] See also Figure 1 The wavelength conversion optical element includes a static copper-based green fluorescent ceramic 9 and a static copper-based red fluorescent ceramic 10, and the focusing collimating lens optical group includes a first focusing collimating lens group 7 and a second focusing collimating lens group 8; the static copper-based green fluorescent ceramic 9 is arranged opposite to the first focusing collimating lens group 7, and the static copper-based red fluorescent ceramic 10 is arranged opposite to the second focusing collimating lens group 8; the first focusing collimating lens group 7 is oppositely arranged with a first dichroic mirror 5, and the second focusing collimating lens group 8 is oppositely arranged with a second dichroic mirror 6, wherein the first dichroic mirror 5 is opposite to the collimating lens array 3, and the second dichroic mirror 6 is opposite to the first dichroic mirror 5;

[0041] The blue excitation light source array 1 emits blue excitation light, and 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, and the first dichroic mirror 5 reflects part of the blue excitation light to the first focusing collimating lens group 7. The first focusing collimating lens group 7 is used to focus the blue excitation light on the static copper-based green fluorescent ceramic 9. The blue excitation light is converted into green light by the static copper-based green fluorescent ceramic 9 and reflected to the first focusing collimating lens group 7 for collimation. The collimated green light is transmitted through the first dichroic mirror 5;

[0042] 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 to the second focusing collimating lens group 8. The second focusing collimating lens group 8 is used to focus the blue excitation light on the static copper base red fluorescent ceramic 10. The blue excitation light is converted into red light after passing through the static copper base red fluorescent ceramic 10 and reflected to the second focusing collimating lens group 8 for collimation. The collimated red light is transmitted through the second dichroic mirror 6.

[0043] See also Figure 1The polarization processing optical group is used to convert green light, red light, and blue laser light into linearly polarized light with the same polarization direction, and 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 of the same structure; the first linear polarizer 11 is arranged opposite to the first dichroic mirror 5, and the second linear polarizer 12 is arranged opposite to the second dichroic mirror 6;

[0044] The liquid crystal light valve optical group is used to control the presence or size of the red light, green light and blue laser light beams. 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.

[0045] The first liquid crystal light valve 14 is disposed opposite to the first linear polarizing plate 11 , and the second liquid crystal light valve 15 is disposed opposite to the second linear polarizing plate 12 .

[0046] The blue laser light source 2 is oppositely provided with a collimating beam expanding lens group 4, the third linear polarizer 13 is oppositely provided with the collimating beam expanding lens group 4, and the third liquid crystal light valve 16 is oppositely provided with the third linear polarizer 13;

[0047] A third dichroic mirror 17 is disposed opposite the first liquid crystal light valve 14, and the third dichroic mirror 17 is also disposed opposite the third liquid crystal light valve 16. A fourth dichroic mirror 18 is disposed opposite the second liquid crystal light valve 15, and the fourth dichroic mirror 18 is also disposed opposite the third dichroic mirror 17. A reflecting mirror 19 is disposed opposite the fourth dichroic mirror 18.

[0048] 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 green light with a polarization direction different from its transmission direction, allowing only the green light parallel to the transmission 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 or size of the green 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. The fourth dichroic mirror 18 transmits the green light to the reflector 19.

[0049] 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 out the red light whose polarization direction is different from its transmission direction, allowing only the red light parallel to the transmission 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 whether the red light passes through or the size of the light beam. The red light transmitted through the second liquid crystal light valve 15 is incident on the fourth dichroic mirror 18, which reflects the red light to the reflector 19.

[0050] The blue laser light source 2 emits a blue laser, which is collimated and expanded to a desired size by the collimating and 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 consistent with the transmission direction of the third linear polarizer 13. The third polarizer is used to filter out light in the blue laser light with a polarization direction different from its transmission direction, allowing only the blue laser light parallel to the transmission direction of the third linear polarizer 13 to pass through; the blue laser light transmitted through the third linear polarizer 13 is incident on the third liquid crystal light valve 16, which is used to control the presence or size of the blue laser light beam; the blue laser light transmitted through the third liquid crystal light valve 16 is incident on the third dichroic mirror 17, which is used to transmit the blue laser light to the fourth dichroic mirror 18, which is used to transmit the blue laser light to the reflecting mirror 19.

[0051] See also Figure 1 A microlens array 20 is arranged opposite to the reflector 19. The red light, green light, or blue laser light incident on the reflector 19 is reflected by the reflector 19 to the microlens array 20. The microlens array 20 is used to uniform the light spot, thereby making the brightness of the projection image projected by the projection lens 25 uniform; a relay lens group 21 is arranged 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 splitting element 22 is arranged opposite to the relay lens group 21; the polarization splitting element 22 in this embodiment is a polarization splitting prism; the polarization splitting prism is used to separate the horizontal polarization and vertical polarization of a beam of light (red light, green light, or blue laser light), that is, to separate it into S-polarized light and P-polarized light. The polarization splitting prism reflects the S-polarized light and transmits the P-polarized light;

[0052] A compensating plate 23 is disposed opposite the polarizing beam splitter prism. In this embodiment, the compensating plate 23 may be an achromatic quarter-wave plate for compensating for phase deviation caused by the pre-tilt angle of the liquid crystal molecules in the LCOS 24, thereby improving the contrast of the image output by the optical machine. The compensating plate 23 is disposed opposite the LCOS 24. A projection lens 25 is disposed on a side of the polarizing beam splitter prism away from the compensating plate 23. The projection lens 25 is disposed opposite the polarizing beam splitter prism. After being compensated by the compensating plate 23, the light beam (red light, green light, or blue laser) is incident on the LCOS 24. The LCOS 24 modulates the polarization state of the light incident on each pixel thereon and reflects it. The reflected light passes through the polarizing beam splitter prism. Since the polarizing beam splitter prism transmits P-polarized light and reflects S-polarized light, the intensity of the light emitted from each pixel of the LCOS 24 can be controlled. The light emitted from each pixel has a different intensity, thereby forming an image. Finally, the image is projected through the projection lens 25.

[0053] 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 than the dynamic wavelength conversion element in the prior art; and the static copper-based green fluorescent ceramic 9 and the static copper-based red fluorescent ceramic 10 are both copper-based fluorescent ceramics, which have good laser resistance and heat dissipation performance, can reduce the thermal quenching effect of fluorescent ceramics, and improve the utilization rate of converting blue excitation light into red light or green light;

[0054] The present invention uses a static copper-based green fluorescent ceramic 9 to generate green light, a static copper-based red fluorescent ceramic 10 to generate red light, and a blue laser light source 2 to generate blue light. It does not require rotating color wheels or X-prisms and other color separation optical components commonly used in traditional laser fluorescent light source projection machines. The present invention has a simpler structure and higher structural reliability.

[0055] In addition, the static copper-based green fluorescent ceramic 9 and the static copper-based red fluorescent ceramic 10 used in the present invention can respectively generate higher green light and red light energy output through blue excitation light excitation. When the red, green and blue lights 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 present invention can reach a higher level; thereby, the projection screen of the projection light machine has the characteristics of high brightness, and the projection light machine can also clearly form an image in a bright environment, thereby solving the problem of unclear images when the projection light machine is used in a bright environment.

[0056] Finally, the present invention adopts a liquid crystal light valve as a switch to control the on and 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 of the red, green and blue light transmission; in conjunction with the static phosphor, the rotating device in the system is eliminated, so that the entire system has higher structural reliability, and solves the problem that the optical machine with a dynamic phosphor light source and the optical machine with a rotating color wheel cannot be used in application scenarios with high reliability requirements such as vehicle-mounted and airborne.

[0057] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. An optical path structure of an LCOS projector using a laser dual-phosphor ceramic light source, characterized by: include A blue excitation light source array (1), the blue excitation light source array (1) is used to emit blue excitation light; a blue laser light source (2), the blue laser light source (2) is used to emit blue laser light; A collimating lens array (3) for collimating blue excitation light; A collimating and beam expanding lens group (4) is used to collimate and expand the blue laser to a desired size; A wavelength conversion optical element is provided with a focusing collimating lens optical group between the blue excitation light source array (1) 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 (9) and a static copper-based red fluorescent ceramic (10); the blue excitation light is converted into green light by the static copper-based green fluorescent ceramic (9), converted into red light by the static copper-based red fluorescent ceramic (10), and then emitted through the focusing collimating lens optical group for collimation and beam expansion; a first dichroic mirror (5) for reflecting a portion of the blue excitation light and transmitting a portion of the blue excitation light and green light; a second dichroic mirror (6) for reflecting blue excitation light and transmitting red light; 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; A liquid crystal light valve optical group, which is used to control the passage or cutoff of red light, green light, and blue laser light, or to adjust the amount of light energy transmitted; a third dichroic mirror (17), configured to reflect green light and transmit blue laser light; a fourth dichroic mirror (18) for reflecting red light and transmitting green light and blue laser light; A reflector (19), a microlens array (20), and a relay lens group (21); A polarization beam splitting element (22), the polarization beam splitting element (22) being 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 (24), wherein the LCOS (24) is used to modulate the polarization state of red light, green light, and blue laser light in the same polarization direction and then reflect the modulated light to the projection lens (25); The polarization processing optical group includes a first linear polarizer (11), a second linear polarizer (12) and a third linear polarizer (13); The collimating lens array (3) is arranged opposite to the blue excitation light source array (1), the first dichroic mirror (5) is arranged opposite to the collimating lens array (3), and the second dichroic mirror (6) is arranged opposite to the first dichroic mirror (5); The first linear polarizing plate (11) is arranged opposite to the first dichroic mirror (5), and the second linear polarizing plate (12) is arranged opposite to the second dichroic mirror (6); The collimating beam expanding lens group (4) is arranged opposite to the blue laser light source (2), and the third linear polarizing plate (13) is arranged opposite to the collimating beam expanding lens group (4); The reflector (19) is arranged opposite to the fourth dichroic mirror (18), the microlens array (20) is arranged opposite to the reflector (19), and the relay lens group (21) is arranged opposite to the microlens array (20).

2. The optical path structure of the LCOS projector using a laser dual-fluorescent ceramic light source according to claim 1, characterized in that: The focusing collimating lens optical group comprises a first focusing collimating lens group (7) and a second focusing collimating lens group (8); the first focusing collimating lens group (7) is located between the static copper-based green fluorescent ceramic (9) and the first dichroic mirror (5); The second focusing and collimating lens group (8) is located between the static copper-based red fluorescent ceramic (10) and the second dichroic mirror (6).

3. The optical path structure of the LCOS projector using a laser dual-fluorescent ceramic light source according to claim 2, characterized in that: The liquid crystal light valve optical group comprises 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 arranged opposite to the first linear polarizing plate (11), and the second liquid crystal light valve (15) is arranged opposite to the second linear polarizing plate (12).

4. The optical path structure of the LCOS projector using a laser dual-fluorescent ceramic light source according to claim 3, characterized in that: The third liquid crystal light valve (16) is arranged opposite to the third linear polarizing plate (13).

5. The optical path structure of the LCOS projector using a laser dual-fluorescent ceramic light source according to claim 4, characterized in that: The third dichroic mirror (17) is arranged opposite to the first liquid crystal light valve (14) and the third liquid crystal light valve (16), and the fourth dichroic mirror (18) is arranged opposite to the second liquid crystal light valve (15) and the third dichroic mirror (17).

6. The optical path structure of the LCOS projector using a laser dual-fluorescent ceramic light source according to claim 5, characterized in that: The polarization beam splitting element (22) is a polarization beam splitting prism, the polarization beam splitting prism and the relay lens group (21) are arranged opposite to each other, and a compensation plate (23) is arranged between the polarization beam splitting prism and the LCOS (24).

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