A color combining prism system for a line light projector

Abstract

The application relates to the technical field of semiconductor photoelectric devices, in particular to a color combining prism system for a linear light source projector. The color combining prism system comprises three primary color linear light sources, an orthogonal dichroic mirror group, a high-precision mirror seat platform and an integrated control unit; the three primary color linear light sources comprise R, G and B linear light sources; and the orthogonal dichroic mirror group comprises a first dichroic mirror and a second dichroic mirror. The application has the advantages that the color combining precision is improved through orthogonal reflection light path design; the temperature drift coefficient is reduced to through the orthogonal locking of the mirror group and the heat pipe heat conduction structure; the scanning residual image is eliminated through the Timer interruption direct drive galvanometer and the synchronous delay; compared with the traditional color combining system, four optical interfaces are reduced, and the light efficiency is improved to >96%.

Description

Technical Field

[0001] This invention relates to the field of semiconductor optoelectronic device technology, specifically a color combining prism system for a line light source projector. Background Technology

[0002] Current projector color mixing systems (such as XCube Prism and Philips Prism) are primarily designed for point or surface light sources, with structures such as... Figure 1 As shown, its core flaw lies in: 1. Bulky structure: Traditional three-way color mixing requires multiple layers of prisms stacked, resulting in a large system size that is difficult to adapt to compact, high-resolution line light source projectors.

[0003] 2. High risk of pixel misalignment: The color matching of point light sources relies on an optical relay system to achieve the three colors to match. The optical path is complex, and temperature drift or mechanical vibration can easily cause RGB pixel shift (especially in the non-scanning direction (X direction) of the online light source), reducing image sharpness.

[0004] 3. Poor compatibility with line light sources: Existing systems cannot directly match ultra-long line light sources (such as Z-direction ≥16,384 pixel units).

[0005] 4. Significant loss of light efficiency: Multiple reflection / transmission interfaces (usually ≥6) result in a cumulative transmittance of <85%, and many film crosstalk phenomena, including the mixing of green light into the blue light channel, are significant under broadband light sources.

[0006] Designing a color matching system that achieves submicron-level RGB pixel alignment accuracy under high-resolution ultra-long line light sources in the Z-axis, with a compact structure that directly outputs a beam strictly parallel to the Y-axis direction of a single-axis galvanometer scan, reduces the number of optical path interfaces, and improves luminous efficiency to >95%, while possessing passive stability against temperature drift and mechanical vibration is of paramount importance. Summary of the Invention

[0007] To address the above issues, a color combining prism system for line light source projectors is proposed. It adopts an orthogonal dual dichroic mirror layout, optimizes the optical path topology, and employs anti-crosstalk and high-efficiency optical paths, significantly reducing crosstalk loss.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a color combining prism system for a line light source projector, comprising three primary color line light sources, an orthogonal dichroic mirror group, a high-precision mirror base platform, and an integrated control unit; The three primary color line light sources include R, G, and B line light sources, which are fixed on the three-dimensional fine-tuning base of the integrated control unit. Among them: the B light source is installed horizontally along the +X direction, and the center of the light output port is at the same height as the reflective surface; the G light source is installed vertically along the +Y direction, and the light output port faces the transmission area; the R light source is installed horizontally along the -X direction, and the center of the light output port is at the same height as the reflective surface; the composite light output end is connected to a collimating lens. The orthogonal dichroic mirror assembly includes a first dichroic mirror and a second dichroic mirror. The first dichroic mirror is embedded in a 45° tilted mirror frame, which is connected to a high-precision mirror mount platform via four-point piezoelectric ceramic micro-actuators to achieve X / Y axis... Dynamic adjustment; the second colorimetric mirror is located above and below the first colorimetric mirror and is embedded in a vertical orthogonal mirror frame, the bottom of which is conducted to the heat dissipation substrate via a heat pipe structure.

[0009] The three primary color line light sources are respectively fixed on the three-dimensional fine-tuning base by rigid flanges.

[0010] Translation accuracy of the three-dimensional fine-tuning base .

[0011] The output end of the synthesized light is connected to a collimating lens, and is directly connected to the galvanometer inlet through a threaded sleeve.

[0012] The collimating lens has f=50mm and NA=0.25.

[0013] The bottom of the orthogonal mirror frame is conducted to the heat dissipation substrate via a heat pipe structure.

[0014] The alignment control loop signal link control method of the system: Signal input path: The signal output from the QPD is transmitted to the ADC1 port of the control unit and acquired at a sampling frequency of 10kHz. Execution output path: X-axis compensation: The position deviation Δx is converted into a piezoelectric ceramic driving voltage via the DAC1 port; Y-axis compensation: The position deviation Δy is converted into a pulse signal via the GPIO port to drive the fine-tuning stepper motor of the R light source.

[0015] The control method for the thermal management loop of the system: Temperature sensing path: The PT1000 sensor, located within the frames of the first and second color-changing mirrors, transmits its signals to the ADC2 / ADC3 ports of the control unit. Temperature control execution path: The collected temperature deviation signal is processed by PID calculation and then converted into a current signal through the DAC2 port to drive the thermoelectric cooler (TEC).

[0016] The line light source projector's line light source array structure includes a micro-light-emitting unit array and an integrated driving system; the micro-light-emitting unit array is a long strip array, employing m×n independently controllable Micro-LED units, with a center-to-center spacing of 1μm between the units, and the effective size of a single micro-light-emitting unit is sub-micron. It supports R / G / B / UV multi-wavelength configuration and allows for wavelength customization according to application requirements; the surface of the micro-light-emitting unit array is directly wafer-bonded to the optical metasurface layer; the integrated driving system includes a CMOS driving backplane, which is a silicon-based integrated circuit containing m×n independent driving units, each of which corresponds one-to-one with a light-emitting unit in the micro-light-emitting unit array; the CMOS driving backplane is copper-copper hybrid-bonded to the lower layer of the micro-light-emitting unit array, and the CMOS driving backplane is connected to the FPGA main control module via an LVDS interface.

[0017] The m≥200, n≥2, m:n≥50; the optical metasurface layer is a silicon dioxide film or silicon nitride film with a thickness of 0.55µm, a surface etching diameter of 100-300nm, a height of 200-800nm, and a spacing < the emission wavelength.

[0018] The beam combining optical path and pixel alignment principle of this invention: Optical path definition: B-path: B light source (+X direction) → reflection from the first color mirror (45°) → turning towards the -Y direction; G-path: G light source (+Y direction) → transmission through the first color mirror → maintaining the -Y direction; R-light path: R light source (-X direction) → reflection from the second diachromatic mirror (45°) → turning to the -Y direction; the three colors of light completely overlap 10mm downstream of the second diachromatic mirror, forming a composite beam output along the -Y direction.

[0019] Zero displacement in the Z direction: All optical paths are fold-free in the Z direction, and the 16,384 pixel units of the line light source strictly maintain position mapping after beam combining.

[0020] Dynamic calibration closed loop: A four-quadrant detector (QPD) is deployed at the synthesized light outlet to detect the spot position deviation (Δx, Δy) in real time, and adjusts it through the following logic: if The control unit drives the piezoelectric ceramic micro-actuator of the first azimuthal mirror to compensate for the X-axis offset; if Adjust the R-axis light source Y-axis fine-tuning base; Control signal link: Alignment control loop such as Figure 4 As shown: Signal input: QPD output → ADC1 port of control unit (10kHz sampling); Execution output: X-axis compensation: position deviation Port → Piezoelectric ceramic driving voltage; Y-axis compensation: Pulse → R-light source fine-tuning stepper motor.

[0021] Thermal management circuit such as Figure 5 As shown: Temperature sensing: PT1000 sensors are embedded in the frames of both the first and second colorimeter mirrors → ADC2 / 3 ports; Temperature control execution: Temperature deviation → PID calculation → DAC2 port → Thermoelectric cooler (TEC) current.

[0022] The technical effects of this invention are shown in Table 1: Table 1. Performance Comparison of the Color Combining System of this Invention with that of the Traditional XCube Prism In summary, the technical effects of this invention are summarized as follows: 1. Improved thermal stability: The orthogonal locking mirror assembly and heat pipe thermal conduction structure reduce the temperature drift coefficient to <0.1μm / ℃; 2. Timing optimization: Timer interrupts direct-drive galvanometer, synchronization delay <1μs, eliminating scanning ghosting; 3. Simplified structure: Compared to traditional color mixing systems, it reduces four optical interfaces and improves luminous efficacy to >96%. Attached Figure Description

[0023] Figure 1 A schematic diagram of the prism structure of a traditional three-way color mixing system; Figure 2 This is a schematic diagram of the orthogonal dichroic mirror group structure of the present invention; Figure 3 This is a schematic diagram of the color mixing system structure of the present invention; Figure 4 This is a diagram of the alignment control loop of the present invention; Figure 5 This is the thermal management circuit diagram of the present invention; In the diagram: 1. Three-dimensional fine-tuning base, 2. Orthogonal mirror frame, 3. Orthogonal dichroic mirror group, 4. Line light source, 5. Flange, 6. Collimating lens, 7. Four-quadrant detector, 8. Piezoelectric ceramic micro-actuator, 9. Heat pipe structure, 10. Heat dissipation substrate, 11. High-precision mirror base platform, D1. First dichroic mirror, D2. Second dichroic mirror. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. These embodiments are implemented based on the technical solution of the present invention, but the scope of protection of the present invention is not limited to the following embodiments. Example 1

[0025] like Figure 3 As shown, a color combining prism system for a line light source projector includes three primary color line light sources, an orthogonal dichroic mirror group 3, a high-precision mirror mount platform 11, and an integrated control unit. The three primary color line light sources include red, green, and blue three-line light sources 4, namely R, G, and B three-line light sources 4, which are respectively fixed on the three-dimensional fine-tuning base 1 of the integrated control unit. Among them: the B light source is installed horizontally along the +X direction, and the center of the light output port is at the same height as the reflective surface of the first optic mirror D1; the G light source is installed vertically along the +Y direction, and the light output port is directly opposite the transmission area of ​​the first optic mirror D1; the R light source is installed horizontally along the -X direction, and the center of the light output port is at the same height as the reflective surface of the second optic mirror D2; the composite light output end is connected to the collimating lens 6. The orthogonal dichroic mirror group 3 includes a first dichroic mirror D1 and a second dichroic mirror D2. The first dichroic mirror D1 is embedded in a 45° tilted mirror frame. The tilted mirror frame is connected to a high-precision mirror base platform 11 via a four-point piezoelectric ceramic micro-actuator 8 to achieve X / Y direction... Dynamic adjustment; the second colorimetric mirror D2 is located above and below the first colorimetric mirror and is embedded in the vertical orthogonal mirror frame 2. The bottom of the orthogonal mirror frame 2 is conducted to the heat dissipation substrate 10 through the heat pipe structure 9.

[0026] The three primary color line light sources are respectively fixed to the three-dimensional fine-tuning base 1 by rigid flanges 5.

[0027] Translation accuracy of the three-dimensional fine-tuning base 1 .

[0028] The output end of the synthesized light is connected to the collimating lens 6, and is directly connected to the galvanometer inlet through a threaded sleeve.

[0029] The collimating lens 6 has f=50mm and NA=0.25.

[0030] The high-precision mirror mount platform consists of: Four-point piezoelectric ceramic micro-actuators: These are located at the four corners of the tilting frame of the first diaphoretic mirror. The tilting frame is connected to a high-precision mirror base platform via the four-point piezoelectric ceramic micro-actuators, which are used to achieve dynamic adjustment of the first diaphoretic mirror in the X and Y directions by ±5μm.

[0031] Orthogonal frame: This is a vertically orthogonal frame used to embed a second ray mirror. The second ray mirror is located above and below the first ray mirror, maintaining a vertical orthogonal relationship with the first ray mirror.

[0032] Heat pipe structure: Located at the bottom of the orthogonal mirror frame, the heat pipe structure conducts heat to the heat dissipation substrate, which is used to quickly dissipate the heat generated by the mirror assembly during operation.

[0033] Heat dissipation substrate: Located at the end of the heat pipe structure, it serves as the final heat dissipation end, dissipating heat into the environment.

[0034] PT1000 temperature sensor: Embedded in the frames of the first and second color mirrors, it is used to monitor the temperature of the mirror assembly in real time and provide feedback signals to the external temperature control system.

[0035] Operating principle of high-precision mirror mount platform: A high-precision mirror mount platform is used to support and adjust the orthogonal dichroic mirror assembly. The first dichroic mirror is connected to the platform via four piezoelectric ceramic micro-actuators, allowing for precise adjustment in the X and Y directions. The second dichroic mirror is embedded in the orthogonal frame, maintaining a perpendicular and orthogonal relationship with the first dichroic mirror to ensure the geometric accuracy of the optical path.

[0036] A heat pipe structure is installed at the bottom of the orthogonal lens frame to conduct the heat generated by the lens assembly to the heat dissipation substrate. This physical heat conduction reduces the temperature gradient of the lens assembly and minimizes the impact of thermal deformation on the optical path. The PT1000 sensor monitors the lens frame temperature in real time and provides feedback signals to the external temperature control system.

[0037] When the external control system detects a deviation in the position of the light spot, the piezoelectric ceramic micro-actuator receives the driving voltage and performs submicron-level displacement compensation on the first diaphoretic mirror to maintain the overlap accuracy of the three-color beams.

[0038] The control unit is the three-dimensional fine-tuning base, which includes the following components: The three-dimensional fine-tuning base body consists of three sets, corresponding to the red, green, and blue light sources respectively, providing an installation base for the line light sources and enabling three-dimensional position adjustment.

[0039] Rigid flange: Used to fix the line light source to the three-dimensional fine-tuning base, ensuring a rigid connection between the line light source and the base.

[0040] Fine-tuning mechanism: Built-in precision translation mechanism with a translation accuracy of ±0.5μm, used to achieve precise position adjustment of the line light source in the X, Y, and Z directions.

[0041] Stepper motor: Located on the three-dimensional fine-tuning base corresponding to the red light source, it is used to receive pulse signals to drive fine-tuning in the Y direction and realize automatic position compensation.

[0042] Operating principle of the control unit: The three-dimensional fine-tuning base is used to achieve precise positioning and dynamic compensation of the line light source. During system installation and debugging, by adjusting each three-dimensional fine-tuning base, the output positions of the red, green, and blue line light sources are made to meet the following relationships: the blue light source is installed horizontally along the +X direction, with the center of its output port at the same height as the reflecting surface of the first spectral mirror; the green light source is installed vertically along the +Y direction, with its output port directly facing the transmission area of ​​the first spectral mirror; and the red light source is installed horizontally along the -X direction, with the center of its output port at the same height as the reflecting surface of the second spectral mirror. The adjustment accuracy is guaranteed by the ±0.5μm translation accuracy of the base itself, ensuring the initial spatial overlap of the three beams.

[0043] During system operation, when a deviation in the Y-direction of the synthesized light spot is detected, the external control unit outputs a pulse signal to drive the stepper motor on the three-dimensional fine-tuning base corresponding to the red light source. This causes the red light source to fine-tune in the Y-direction, bringing the deviation to zero. After adjustment, the rigid flange ensures that there is no relative displacement between the line light source and the base, maintaining positional stability. Example 2

[0044] The beam combining optical path and pixel alignment principle of this invention: Optical path definition: B-path: Source B (+X direction) → Reflection by first diachromatic mirror D1 (45°) → Turning towards the -Y direction; G-path: G light source (+Y direction) → transmission through first diachromatic mirror D1 → maintaining the -Y direction; R-path: R-source (-X direction) → reflection from second diachromatic mirror D2 (45°) → turning towards the -Y direction; The three colors of light completely overlap 10mm downstream of the second diachromatic mirror D2, forming a composite beam output along the -Y direction.

[0045] Zero displacement in the Z direction: All optical paths are fold-free in the Z direction, and the 16,384 pixel units of the line light source strictly maintain position mapping after beam combining.

[0046] Dynamic calibration closed loop: A four-quadrant detector (QPD) is deployed at the synthesized light outlet to detect the spot position deviation (Δx, Δy) in real time, and adjusts it through the following logic: if The control unit drives the piezoelectric ceramic micro-actuator of the first azimuthal mirror D1 to compensate for the X-axis offset; if Adjust the R-axis light source Y-axis fine-tuning base; Control signal link: Alignment control loop such as Figure 4 As shown: Signal input: QPD output → ADC1 port of control unit (10kHz sampling); Execution output: X-axis compensation: position deviation Port → Piezoelectric ceramic driving voltage; Y-axis compensation: Pulse → R-light source fine-tuning stepper motor.

[0047] Thermal management circuit such as Figure 5 As shown: Temperature sensing: PT1000 sensors → ADC2 / 3 ports are embedded in the frames of both the first zoning mirror D1 and the second zoning mirror D2; Temperature control execution: Temperature deviation → PID calculation → DAC2 port → thermoelectric cooler (TEC) current. Example 3

[0048] The workflow of this invention: Initial calibration: Illuminate the G light source reference beam and adjust the R / B light source fine-tuning base to the QPD display. ; Dynamic projection: The host computer sends color-separated image data (R / G / B three-channel 16,384×1 pixel array). The control unit parses the data and writes it to the CMOS driver backplane; When the galvanometer moves to the beginning of the row, it triggers a row synchronization pulse, and the light source illuminates the pixels of the current row. The three-color beams are orthogonally combined through the first ray mirror D1 and the second ray mirror D2, then collimated by a collimating lens, and finally scanned and projected by a galvanometer.

[0049] The color-combining prism system of the present invention can only achieve the corresponding technical effect when used in a defined line light source array structure. The specific principle and advantages are as follows: Specific principles: Geometric mapping: This color combining system adopts an orthogonal double dichroic mirror layout. In the non-scanning direction (Z-axis), there is no optical path folding or relay image conversion. The three primary color line light sources are directly combined and output after reflection / transmission through the first and second dichroic mirrors.

[0050] The core feature of this topology is that for each pixel unit of the line light source in the Z direction, from the emitting surface to the beam-combining output surface, the spatial position is strictly maintained in a one-to-one mapping, without any lateral displacement or distortion.

[0051] The technical value of this "zero displacement" geometric mapping characteristic is highly dependent on the continuity, consistency, and length of the light source pixel array. Only when the light source itself is a continuous strip array with a pixel center spacing ≤1μm, a pixel number ≥16k, and an m×n (m≥200, n≥2, m:n≥50) shape, can the Z-axis zero displacement design of this system completely and proportionally transfer each pixel of the light source to the projection surface.

[0052] If discrete LED splicing, low-density pixel arrays, or discontinuous light-emitting surfaces are used, the pixel gaps, splicing errors, and edge distortions will be directly mapped to dark areas, brightness jumps, or resolution losses after beam combining. The optical precision of this system will instead become a "microscope" that magnifies the defects of the light source.

[0053] Beam matching: The orthogonal dichroic mirror group (first dichroic mirror D1, second dichroic mirror D2) of this system uses a multilayer interference film system to achieve spectral selection: B-light reflection, G-light transmission, and R-light reflection. The transmittance / reflectance curve of this type of film system has significant angle sensitivity—when the incident angle deviates from the design value (45°±Δθ), the cutoff band edge will exhibit a blue shift or red shift.

[0054] In traditional color mixing systems, the large-angle incidence of edge light is the main source of film crosstalk phenomena such as blue light channel mixing with green light and green light channel mixing with red light, which directly leads to narrowing of color gamut and decrease in contrast.

[0055] The application defines a wafer-bonded optical metasurface layer for a line light source array. This metasurface layer is a silicon dioxide or silicon nitride film with a thickness of 0.55µm. The surface is etched with a subwavelength structure with a diameter of 100-300nm, a height of 200-800nm, and a spacing less than the emission wavelength. Its physical function is to compress the large-angle diffused beam emitted by the light-emitting unit into a near-collimated beam, and to narrow the angle distribution of the light incident on the dichroic mirror to within ±5°.

[0056] This narrow angle characteristic is precisely matched with the angle cutoff steepness of the dichroic mirror film system in this system: the narrower the incident angle distribution, the closer the actual transmittance / reflection curve of the film system is to the design ideal value, and the less spectral cross-contamination.

[0057] Advantages: Geometric mapping: Complete preservation of the ultra-long pixel array: The Z-axis zero displacement design ensures that the spatial position of each pixel in the 16,384 pixel unit of the line light source remains strictly unchanged after beam combining, without any software remapping or pixel position correction, achieving true "what you see is what you get" optical beam combining.

[0058] Pixel-level color purification: When the light source pixel size is submicron (<1μm) and the beam combining accuracy is <0.5μm, the edge overlap error of the three-color pixels can be controlled within <1 / 2 pixel. At this pixel scale, traditional color combining systems can cause pixel misalignment of 3-5 pixels due to temperature drift or vibration, while this system can achieve single-pixel-level three-color overlap with passive stabilization.

[0059] Beam matching: Crosstalk loss is significantly reduced: When a traditional wide-angle light source is incident, light leakage at the edge of the dichroic mirror film system causes green light components to mix into the blue light channel and red light components to mix into the green light channel. This system, combined with a metasurface collimated beam, achieves an incident angle distribution of <±5°, and the actual transmittance / reflection curve of the film system approaches the design ideal value, resulting in a significant improvement in color purity.

[0060] Ultimate optimization of interface light effect: Traditional color mixing systems require 6-8 optical interfaces, with a cumulative transmittance of <85%; this system retains only 4 necessary interfaces (first azimuth mirror transmit / reflect, second azimuth mirror transmit / reflect). Under narrow incident angle conditions, the antireflection / high reflectance coating of each interface can operate at the optimal design angle, and the system transmittance is >96%, which is more than 10 percentage points higher than the traditional solution.

[0061] The line light source array structure of the projector used in this color fusion system includes a micro-light-emitting unit array and an integrated driving system; the micro-light-emitting unit array is a long strip array, employing m×n independently controllable Micro-LED units, with a center-to-center spacing of 1μm between the units, and the effective size of a single micro-light-emitting unit is sub-micron. It supports R / G / B / UV multi-wavelength configuration and allows for wavelength customization according to application requirements; the surface of the micro-light-emitting unit array is directly wafer-bonded to the optical metasurface layer; the integrated driving system includes a CMOS driving backplane, which is a silicon-based integrated circuit containing m×n independent driving units, each of which corresponds one-to-one with a light-emitting unit in the micro-light-emitting unit array; the CMOS driving backplane is copper-copper hybrid-bonded to the lower layer of the micro-light-emitting unit array, and the CMOS driving backplane is connected to the FPGA main control module via an LVDS interface.

[0062] The m≥200, n≥2, m:n≥50; the optical metasurface layer is a silicon dioxide film or silicon nitride film with a thickness of 0.55µm, a surface etching diameter of 100-300nm, a height of 200-800nm, and a spacing < the emission wavelength.

[0063] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should fall within the protection scope of the present invention.

Claims

1. A color-combining prism system for a line light source projector, characterized in that, It includes a three-way primary color line light source, an orthogonal dichroic mirror group, a mirror mount platform, and a control unit; The three primary color line light sources include three line light sources: R, G, and B, which are fixed on the three-dimensional fine-tuning base of the control unit. Specifically: the B light source is installed horizontally along the +X direction, with the center of its light output port at the same height as the reflecting surface of the first spectral mirror; the G light source is installed vertically along the +Y direction, with its light output port facing the transmission area of ​​the first spectral mirror; and the R light source is installed horizontally along the -X direction, with the center of its light output port at the same height as the reflecting surface of the second spectral mirror. The orthogonal dichroic mirror assembly includes a first dichroic mirror and a second dichroic mirror. The first dichroic mirror is embedded in a 45° tilted mirror frame, which is connected to a mirror base platform via four-point piezoelectric ceramic micro-actuators to achieve X / Y directional dichroism. Dynamic adjustment; the second zoning mirror is located above and below the first zoning mirror and is embedded in a vertical orthogonal frame.

2. The color combining prism system for a line light source projector according to claim 1, characterized in that... The three primary color line light sources are respectively fixed on the three-dimensional fine-tuning base by rigid flanges.

3. A color combining prism system for a line light source projector according to claim 1 or 2, characterized in that... Translation accuracy of the three-dimensional fine-tuning base .

4. A color combining prism system for a line light source projector according to claim 1, characterized in that... The output end of the synthesized light is connected to a collimating lens, and is directly connected to the galvanometer inlet through a threaded sleeve.

5. A color-combining prism system for a line light source projector according to claim 1 or 4, characterized in that... The collimating lens has f=50mm and NA=0.

25.

6. A color combining prism system for a line light source projector according to claim 1, characterized in that... The bottom of the orthogonal mirror frame is conducted to the heat dissipation substrate via a heat pipe structure.

7. A color combining prism system for a line light source projector according to claim 1, characterized in that... The alignment control loop signal link control method of the system is as follows: Signal input path: The signal output from the QPD is transmitted to the ADC1 port of the control unit and acquired at a sampling frequency of 10kHz. Execution output path: X-axis compensation: The position deviation Δx is converted into a piezoelectric ceramic driving voltage via the DAC1 port; Y-axis compensation: The position deviation Δy is converted into a pulse signal via the GPIO port to drive the fine-tuning stepper motor of the R light source.

8. A color combining prism system for a line light source projector according to claim 1, characterized in that... The control method for the thermal management loop of the system is as follows: Temperature sensing path: The PT1000 sensor, located within the frames of the first and second color-changing mirrors, transmits its signals to the ADC2 / ADC3 ports of the control unit. Temperature control execution path: The collected temperature deviation signal is processed by PID calculation and then converted into a current signal through the DAC2 port to drive the thermoelectric cooler (TEC).

9. A color combining prism system for a line light source projector according to claim 1, characterized in that... The line light source projector's line light source array structure includes a micro-light-emitting unit array and an integrated driving system. The micro-light-emitting unit array is a long strip array, employing m×n independently controllable Micro-LED units. The center-to-center spacing of the units is 1 μm, and the effective size of a single micro-light-emitting unit is sub-micron. It supports R / G / B / UV multi-wavelength configuration and allows for wavelength customization according to application requirements; The surface of the micro-light-emitting unit array is directly wafer-bonded to the optical metasurface layer; The integrated driving system includes a CMOS driving backplane, which is a silicon-based integrated circuit containing m×n independent driving units. Each independent driving unit corresponds one-to-one with a micro-light-emitting unit array light-emitting unit. The CMOS driving backplane is copper-copper hybrid bonded to the lower layer of the micro-light-emitting unit array. The CMOS driving backplane is connected to the FPGA main control module through an LVDS interface.

10. A color-combining prism system for a line light source projector according to claim 9, characterized in that... The feature is that m≥200, n≥2, m:n≥50; the optical metasurface layer is a silicon dioxide film or silicon nitride film with a thickness of 0.55µm, a surface etching diameter of 100-300nm, a height of 200-800nm, and a spacing < the emission wavelength.

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