Array multi-channel multi-wavelength large-power uniform illumination light distribution system

Abstract

The application discloses an array multi-channel multi-wavelength large-power uniform illumination light distribution system, which comprises a plurality of light beam propagation channels, a single light beam propagation channel comprising a laser light source, a free-form surface reflector and a target surface, the free-form surface reflector projects light rays emitted by the laser light source to the target surface in an optimal manner to form high-efficiency uniform illumination; a plurality of laser light sources are arranged in a ring array, the laser light sources have multiple wavelengths, collimation and Gaussian distribution; the free-form surface reflector comprises a plurality of free-form surfaces, and the plurality of free-form surfaces are arranged in a ring array; in summary, the optimal ring arrangement of the array multi-channel makes the system structure compact; the free-form surfaces correspond to the number and positions of the laser light sources one by one; and the target surface is a micro-mirror array surface of a same digital micro-mirror device (DMD). The light distribution system superimposes and projects light beams emitted by different light sources on the target surface through the plurality of channels to jointly improve power, illumination uniformity and chrominance uniformity.

Description

Technical Field

[0001] The present invention relates to the technical field of optical design, and in particular to an array multi-channel multi-wavelength high-power uniform lighting light distribution system. Background Art

[0002] With the continuous advancement of projection technology, projectors have been widely used in various fields such as education, business, and home entertainment. However, modern projection scenarios are becoming increasingly complex, placing higher demands on the brightness and color performance of projected images. Traditional projection systems usually use a single light source or color wheel design, which makes it difficult to meet the high brightness and uniformity requirements in high-light environments or large projection areas. Especially when the scene requires higher brightness output, the stability of traditional light sources and the uniformity of the composite light beam still have many shortcomings. In outdoor activities, large-scale presentations, and high-brightness display scenarios, users' demands for the brightness and color uniformity of the projected image have increased significantly. Traditional systems often find it difficult to achieve ideal display effects, thus affecting the overall visual experience.

[0003] The present invention provides an array multi-channel multi-wavelength high-power uniform lighting light distribution system, which aims to optimize the shortcomings of traditional projection three-color light source beam combining and power. The light distribution system adopts three monochromatic laser light sources of red, green and blue, and evenly distributes the multi-primary color light sources to the surface of the digital micromirror device (DMD) through a free-form surface light distribution reflector to achieve highly uniform light distribution. At the same time, the problem of beam combining is circumvented by directly shaping the light beam to the DMD. The system's three-color laser light source combination provides a white light output with high brightness, and the precise distribution of multi-beam light energy is achieved through high-precision free-form surface design. The light distribution system has a compact structure, which makes the overall volume small, and the compactness of the light source layout is further enhanced by the circular arrangement of light sources, providing space for adding more light sources. In addition, this design method does not require a traditional color wheel, but synthesizes white light through three-primary color lasers, overcoming the light decay and color unevenness problems caused by the combination of monochromatic light source and color wheel. The multi-layered ring structure of the free-form surface light distribution reflector is adapted to the light source layout and can provide a stable and bright light beam in a limited space, meeting the needs of large projection areas and high-brightness application scenarios. Summary of the Invention

[0004] In response to the problems of insufficient brightness and poor three-color photosynthesis effect of existing projection instruments, the present invention provides an array multi-channel, multi-wavelength, high-power, uniform lighting light distribution system, which sets up more light sources to achieve high-brightness uniform lighting through free-form surface light distribution.

[0005] The technical solutions of the present invention are as follows:

[0006] An array multi-channel, multi-wavelength, high-power, uniform illumination light distribution system. The light distribution system includes multiple beam propagation channels. A single beam propagation channel includes a laser light source, a free-form surface, and a target surface. The free-form surface projects light from the laser light source onto the target surface in an optimal manner, resulting in efficient and uniform illumination.

[0007] Several laser light sources are arranged in a circular array, and the laser light sources have multiple wavelengths, collimation, and Gaussian distribution. Several free-form surfaces form a free-form surface reflector, and the free-form surfaces are arranged in a circular array. The multi-channel array formed in a circular arrangement makes the system structure compact.

[0008] The number and position of the free-form surfaces and the laser light sources correspond one to one. Preferably, the laser light sources and the free-form surfaces are arranged facing each other and corresponding to each other diagonally.

[0009] The target surface is the micromirror array surface of the same digital micromirror device (DMD).

[0010] The light distribution system superimposes and projects light beams emitted by different light sources onto the target surface through multiple channels, achieving a joint improvement in power, illumination uniformity, and color uniformity.

[0011] Furthermore, the laser light source includes monochromatic laser sources with three wavelengths: red, green, and blue. These three monochromatic light sources are collimated, resulting in a Gaussian energy distribution and high directivity, with the beam divergence angle controlled within a preset range. Multiple light sources with different wavelengths are combined in power and color to achieve a combined improvement in power, illumination uniformity, and color uniformity.

[0012] Furthermore, the single monochromatic laser light source performs independent light distribution, and the multiple laser light sources are distributed in a multi-layer ring shape as a whole, making the overall structure compact. More light sources can be placed in a limited space, and the power combination of multiple light sources provides high-power lighting.

[0013] Furthermore, the light source color is provided by a combination of red, green and blue laser diodes. By adjusting the output power ratio of the three primary colors, the color combination forms standard white light; the red, green and blue laser combination has a color gamut that can meet the BT.2020 standard; it completes light beam color mixing on the surface of the DMD micromirror array, and the light beam forms a uniform color distribution on its surface.

[0014] Furthermore, the multiple free-form surfaces are distributed in a multi-layered annular pattern, making the structure more compact and reducing the space occupied by the free-form surface reflector. The free-form surfaces are arranged according to a preferred structural layout, reflecting the light beam incident on their surfaces to the surface of the DMD micromirror array, forming a uniform illumination distribution.

[0015] Furthermore, several of the free-form surfaces are formed by setting a central surface and then adding other free-form surfaces in a circular array around the central surface; the incident angle of the central surface projected onto the target surface is controlled to be 23°-25° (relative to the DMD surface normal) and is incident on the DMD surface, and the light beam is centered in the direction of the DMD normal vector and is emitted within a range of plus or minus 5°. When the light beams in other areas of the free-form surface are incident on the target surface, their exit angles after reflection will deviate from the exit angles of the central area, and the angles will be expanded or reduced relative to the exit angles of the central area; at the same time, the light beams reflected to the target surface by other free-form surfaces around the center will also have divergence angles that expand or shrink around the exit angles of the central free-form surface; through this design, the divergence angle of the light beam after reflection from the target surface can be controlled to a smaller range to the maximum extent; the incident angle of the light beam is effectively controlled through the preferred structural layout, thereby constraining the exit angle of the light beam after reflection from the DMD micromirror array surface, thereby reducing the requirements for the aperture of the projection lens.

[0016] Furthermore, the free-form surface uses the ellipse envelope method to calculate a numerical matrix of the optical path constant K from the light source focus to the target focus. By optimizing the K value data in this matrix, the coordinate distribution of each sub-surface of the free-form surface is obtained, and the optimal free-form surface is fitted. After the corresponding light beam is reflected by the free-form surface, it forms a uniform illumination distribution on the surface of the DMD micromirror array. The light beam corresponding to each ellipse sub-surface is a cone of light with a divergence angle close to 0 degrees. This cone of light is approximated by a parallel beam to optimize calculation and design efficiency.

[0017] Furthermore, the free-form surface layout is distributed in multiple layers, and the single-layer reflective surface is distributed in an annular shape as a whole; the annular distribution can make the single-layer free-form surface layout compact, and the multi-layer distribution increases the number of free-form surfaces that can be placed exponentially when the number of single layers reaches the limit. The laser light source and the corresponding free-form surface are distributed in opposite directions. This spatial structure enables the overall reflective surface to ensure that the free-form surface layout is as compact as possible while avoiding light obstruction.

[0018] Furthermore, the light beam emitted by the light source in the single beam propagation channel is reflected by the free-form surface onto the surface of the DMD micromirror array, resulting in a highly uniform illumination distribution across the surface. Each light source and its corresponding free-form surface are arranged in a preferred structure to form multiple beam propagation channels. Each beam propagation channel independently distributes light, and multiple channels simultaneously project shaped light spots onto the surface of the DMD micromirror array. The illumination of these spots is superimposed in this area. Because the peaks and valleys of the illumination unevenness of each independent light spot are offset to a certain extent when superimposed, the overall illumination uniformity is further improved.

[0019] Furthermore, the DMD micromirror array surface receives shaped light spots formed by the light beams projected by each light beam propagation channel, and these light spots precisely overlap on the DMD micromirror array surface; the micromirror array has two flip angles, one flip angle precisely projects the incident light beam to the subsequent projection lens to complete imaging, and the other flip angle deflects the light beam to other areas to avoid it interfering with imaging; the DMD, light source, and free-form surface light distribution reflector jointly optimize the light path through the optimal structure to ensure efficient transmission and precise projection of the light beam.

[0020] The design ideas of the present invention are as follows:

[0021] A light distribution system with multi-channel, multi-wavelength, high-power, uniform lighting array includes three monochromatic light sources (red, green, and blue), a free-form surface reflector, and a digital micromirror device (DMD). The free-form surface reflector is used to evenly distribute the light beam emitted by each color light source to the surface of the DMD micromirror array. By rationally designing the output power ratio of the red, green, and blue light sources, they are combined into white light, thereby improving the overall brightness performance of the light source. Specifically, the light source includes red, green, and blue laser light sources with high monochromaticity and high directivity. By adjusting the divergence angle of the light source, the light beam is precisely guided to the free-form surface reflector. The free-form surface reflector is composed of multiple free-form surfaces, each of which is responsible for evenly distributing the incident light beam to the DMD surface, thereby achieving a highly uniform lighting effect. The free-form surface reflector adopts a three-layer stacked structure to effectively control the incident angle of the light beam, avoid beam dispersion, and improve the efficiency of light energy utilization. The light sources are arranged in a ring, making the system structure compact and further enhancing the brightness and uniformity.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1) Using a collimated monochromatic laser diode as the light source can achieve more accurate color reproduction and avoid the color shift problem that may occur when multiple color light sources are mixed. Because it is not restricted by the color wheel, there will be no color separation and reduced contrast problems, and it can provide higher contrast. At the same time, laser diodes usually have a longer life than traditional bulbs, which can reduce maintenance costs and the frequency of light source replacement.

[0024] 2) The area of ​​a single free-form surface (reflecting surface) is extremely small, and the space occupied by multiple free-form surfaces combined is also extremely limited. At the same time, the space occupied by a single laser diode is also quite small compared to a light bulb. The same space can be configured with more light sources to provide higher brightness.

[0025] 3) The light emitted by the light source is directly reflected onto the DMD through the free-form surface reflector. The loss of light beam propagation in this process is extremely small. At the same time, if there are enough free-form surfaces, the light distributed on the DMD surface can be guaranteed to be highly uniform, thereby improving the quality of imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Freeform surface (ellipsoidal surface) design principle diagram;

[0027] Figure 2 Freeform surface in a single sub-surface reflection effect diagram;

[0028] Figure 3 Single freeform surface will be uniformly distributed to the DMD surface effect schematic diagram of light beam;

[0029] Figure 4 3 light source through 3 freeform surface to the DMD surface effect schematic diagram of uniform distribution;

[0030] Figure 5 3 light source and freeform surface reflector and its with DMD optical structure diagram;

[0031] Figure 6 3 light source emitted collimated light beam after freeform surface light distribution DMD surface illuminance distribution diagram;

[0032] Figure 7 21 light source center and edge four corners of the 5 light beam optical structure diagram;

[0033] Figure 8 The first column of collimated light beam through the corresponding surface light distribution of light path diagram and DMD surface illuminance distribution diagram;

[0034] Figure 9 The second column of collimated light beam through the corresponding surface light distribution of light path diagram and DMD surface illuminance distribution diagram;

[0035] Figure 10 The third column of collimated light beam through the corresponding surface light distribution of light path diagram and DMD surface illuminance distribution diagram;

[0036] Figure 11 21 light source through freeform surface reflector light distribution DMD surface illuminance distribution diagram;

[0037] Figure 12 21 light beam overall simulation schematic diagram. DETAILED DESCRIPTION

[0038] The present application is further described below in conjunction with the accompanying drawings and examples.

[0039] An array of multi-channel multi-wavelength high-power uniform illumination light distribution system, laser light source, freeform surface reflector and digital micro-mirror device DMD;

[0040] The design principle of freeform surface reflector is as follows:

[0041] According to the geometric properties of the ellipse, the sum of the distances from any point on the ellipse to its two foci is a constant, and in the corresponding ellipsoid, a ray emitted from one focus O of the ellipsoid, after being reflected by the surface of the ellipsoid, must pass through the other focus of the ellipsoid. Figure 1 As shown, the light source is placed at the first focus O and the receiving surface is placed at the second focus T. In this way, the light emitted from the light source will all converge to the second focus after being reflected by any point P on the surface of the ellipsoid.

[0042] When the ellipsoid is immersed in air, that is, when the refractive index of the medium on both sides of the ellipsoid is 1, assuming that the OP length is ρ and the PT length is t, the optical constant K of the light propagation process can be expressed by the following formula:

[0043] K=|OP|+|PT|=ρ+t

[0044] The optical meaning of this formula is that the optical path is equal to the sum of the distances between any point on the ellipsoid and the line connecting the two foci. Assuming that the distance between the two foci O and T is f, and the distance between the focus O and the adjacent major axis vertex is h, K can be expressed as follows:

[0045] K=2h+f

[0046] θ is the angle between OP and Z axis, is the angle between the projection OP0 of OP on the xOy plane and the X axis, and the coordinate of the other focus T is (T x , T y , T z ), combining the above two formulas, we can get the ρ value formula:

[0047]

[0048] The coordinates (x, y, z) of point P can be obtained from the three-dimensional coordinate conversion formula. The ellipsoidal surface (free-form surface) can be fitted by the coordinates of point P.

[0049] Laser diode light sources are small in size, usually only a few millimeters in diameter. After the light is collimated, if the outgoing light source surface is divided into millions of light rays, then the light source sub-surface composed of hundreds of adjacent light rays can be regarded as a parallel light beam emitted by a point light source with a divergence angle of nearly 0, which can be reflected to the set target point using an elliptical surface. Figure 2As shown, the light source sub-surface 2 that can emit hundreds of light rays divided by the light source 1 is approximately regarded as a focus of the ellipse, and a target point 6 on the target surface 5 is regarded as the other focus. The light emitted by the divided light source sub-surface is reflected to the target point through an ellipsoidal surface 4 that constitutes the free-form surface 3. Light source sub-surfaces at different positions correspond to different target points on the target surface and are reflected by different ellipsoidal surfaces. By adjusting the optical constant K corresponding to each ellipsoidal surface, the relative size of the ellipsoidal surfaces can be precisely controlled. The size of the ellipsoidal surface actually reflects the size of the light source sub-surface corresponding to each ellipsoidal surface, and the size of the light source sub-surface represents the amount of energy allocated to the target point. Therefore, by adjusting the K parameter, the amount of energy reflected to each point on the target surface can be precisely controlled. Through multiple iterations, the K value corresponding to each free-form surface is continuously increased or decreased until the energy allocated to each target point is close to the same. After that, all the ellipsoidal surfaces are spliced ​​together to form a free-form surface 3, and finally the goal of evenly distributing energy to every point on the target surface through the free-form surface is achieved.

[0050] Since each sub-surface of the free-form surface is composed of multiple coordinate points, and the sub-surface corresponds to the luminous flux of a point on the target surface, the centroid of the sub-surface, that is, the centroid of the luminous flux corresponding to the surface, is taken as the fixed point of the sub-surface. The fixed point represents the original sub-surface, and all the sub-surface fixed points are fitted into a new free-form surface, which can achieve a uniform distribution of the luminous flux on the receiving surface. The more target points, the more sub-surfaces are required, and the more fixed points are calculated, and the more accurate the surface optimization is. Figure 3 As shown in the figure, when the number of free-form surfaces 2 and the number of target points on the corresponding target surface 3 reach a certain level and are evenly distributed, and the condition of evenly distributing the energy of the light source 1 to each point is satisfied, the centroid interpolation method is used to perform centroid interpolation on the coordinates constituting the same sub-surface. Then, the light beam can be regarded as evenly distributed on the target surface 3 after being reflected by the free-form surface 2.

[0051] In the light distribution system, such as Figure 4 As shown, three collimated laser diodes (1.1, 1.2, and 1.3)—red, green, and blue—are used as light sources. By appropriately adjusting the power ratio of each color, they are synthesized into white light, thereby enhancing the system's brightness and color balance. Using DMD 8 as the target surface, sufficient sub-surfaces are provided for the three free-form surfaces 2.1, 2.2, and 2.3 that reflect the three-color beams. In other words, sufficient target focal points are set on the surface of DMD 3 to ensure uniform distribution of the three-color light after being shaped by the free-form surfaces.

[0052] Example 1:

[0053] Using red, green, and blue laser diodes as light sources, each laser diode's beam is first collimated by a collimating lens assembly to ensure high beam precision and brightness. The collimating lens assembly transforms the laser beam from its initial divergent state into a parallel beam, ensuring uniform beam transmission and precise focus onto each reflective surface of the free-form reflector. The diameter of the collimated beam emitted by each laser diode is adjusted to 3mm. After collimation, the divergence angle of the laser beam is controlled within a very small range.

[0054] Based on the above principles, a free-form surface reflector is established, and the reflection area of ​​the micromirror on the DMD surface is 16mm×9mm. The collimated light beams emitted by the three light sources are shaped by the corresponding free-form surface reflectors. The light beams are shaped into square spots with the same shape and size as the DMD reflection area and are evenly incident on the DMD surface. The free-form surface reflector adopts a high-precision design, which can accurately distribute the light beam of each laser light source in space, ensuring the formation of a uniformly distributed light spot on the DMD surface, thereby achieving uniform illumination. In addition to using elliptical free-form surfaces, the above-mentioned light distribution effect can also be achieved by using parabolic free-form surfaces.

[0055] 3 Light source and free-form surface reflector and its optical path structure with DMD as shown in the figure Figure 5 As shown in Figure 2, the freeform reflector structure is composed of three independently designed freeform surfaces fitted together and integrated into a single entity. Through this design, the light from each laser source is effectively shaped by its corresponding freeform surface and evenly illuminates the DMD surface.

[0056] The effect of the free-form surface reflector is simulated by simulation software. The illumination distribution formed on the DMD surface after the free-form surface reflector is as follows Figure 6 As shown in FIG. 1 , after the reflector is shaped, the illumination uniformity on the DMD reflector surface exceeds 0.9, and the light distribution effect is good, and its capacity can meet the needs of the projection system.

[0057] While this design can achieve high uniformity while maintaining high light efficiency, the limited number of light sources in this configuration and the limited power of each light source cannot meet the requirements of laser projection systems in high-brightness scenarios. Therefore, to further improve the system's brightness and meet the needs of higher-brightness applications, the system may need to increase the number of light sources or increase the power of each light source. Adding multiple light sources or adjusting the light source configuration will help provide stronger light output while maintaining lighting uniformity, thereby achieving a brighter and more uniform projection effect.

[0058] Example 2

[0059] Example 2 also uses a three-color laser light source, and its beam collimation process is the same as that of Example 1. The difference is that a total of 21 light sources are used to further improve the total light power while being able to form standard white light.

[0060] The three-color laser light source selected uses the ML562H84 laser diode with a wavelength of 638nm and a power of 2.5W for red; the NUGM06T laser diode with a wavelength of 525nm and a power of 1.65W for green; and the NUBM0F laser diode with a wavelength of 455nm and an output power of 5.4W for blue. Based on the tristimulus values ​​corresponding to each wavelength in the CIE 1931 standard chromaticity spectrum, the power ratio of the red, green, and blue lasers synthesizing standard white light is 2.3035:1.5049:1. Taking into account the power of each individual laser diode, the final number of red, green, and blue laser diodes in the 21 laser diodes is 10, 9, and 2, respectively, for a total power of 10*2.5+9*1.65+2.5.4=50.65W. The total layout of the light source is three rows and seven columns. The layout order of the laser diodes in the first and third rows is red, green, blue, green, red, blue, red; the layout order of the laser diodes in the second row is green, red, green, red, green, red, green; the layout order of the laser diodes in the third row is red, green, red, green, red, green, red.

[0061] Based on the technical solution, a free-form surface reflector was built to match each light source. The micromirror reflective area on the DMD surface was 16mm long and 9mm wide. The beam from each light source was shaped into a square spot of the same shape and size by the corresponding reflective free-form surface before being incident on the DMD.

[0062] The free-form surface reflector structure model and its relative layout position with DMD are shown in the figure. Figure 7As shown, the free-form surface reflector 2 structure is formed by fitting multiple free-form surfaces and integrating them into a single entity. If all laser diodes 1 were arranged in the same longitudinal space, the angle at which some light beams would be reflected by the reflectors onto the DMD3 surface would be too large. After further reflection by the micromirrors on the DMD3 surface, the overall divergence angle of the light beam would be too large, placing high demands on the aperture of the subsequent projection lens. Therefore, a three-layer stacked structure is adopted, evenly distributing all the reflective surfaces across the three layers. This keeps the angle of the light beam incident on the DMD3 surface within a certain range, reducing the performance requirements of the projection lens. Therefore, the 21 free-form surfaces are arranged in three columns to better control the reflection angle of the light after it enters the DMD3. The distances between the three columns of free-form surfaces and DMD3 are 35mm, 47mm, and 56mm, respectively. Each individual free-form surface is arranged in a ring centered around DMD3, maintaining a structure as compact as possible. The angle of incidence of the central free-form surface on the DMD center is controlled within the range of 23-25°, so that the light beam reflected by the central free-form surface can be emitted nearly perpendicularly relative to the DMD surface after reaching the center of the DMD micromirror area (within the range of ±5° centered on the DMD normal vector direction), making the overall divergence angle of the light beam reflected from the DMD micromirror area as small as possible. The other free-form surfaces are placed around the center of the micromirror area with the central free-form surface as the starting point, thereby controlling the overall angle of the light beam reflected by the DMD micromirror within a certain range. At the same time, the laser diode is placed opposite the reflector. The longitudinal spacing between the laser diodes is controlled by adjusting the facing distance between the laser diodes and the reflector, compressing the overall volume of the combined laser diodes while ensuring sufficient installation space for each laser diode.

[0063] The free-form reflector is simulated by simulation software for each column of the reflective surface and the free-form reflector as a whole. The optical path structure diagram of the five beams at the center and the four corners of the edge is shown as follows: Figure 7 As shown, all the rows and columns of light beams in the light source group 1 can be incident on the surface of DMD3 through the corresponding free-form surface in the corresponding free-form surface reflector module 2, which simply represents the optical path structure 21. The actual simulated optical path diagram is as follows Figure 12 As shown. Figure 8 、 Figure 9 、 Figure 10 As shown, the collimated light beam emitted by the laser diode 1 corresponding to each column of reflectors 2 is shaped and uniformed by the reflector and then incident on the surface of the DMD reflector 3. It can be seen that after the light beam is shaped and distributed by the reflector corresponding to each column of light beam, the illumination uniformity on the DMD reflector surface exceeds 0.9. The energy peaks and valleys of the 21 shaped light spots are neutralized to a certain extent, and the overall uniformity can be improved to a certain extent. The corresponding illumination distribution on the DMD surface is shown as follows Figure 11As shown, its overall uniformity exceeds 0.95, which can better meet the illumination uniformity requirements of laser projection. A total of 21 light sources provide sufficient brightness for projection. At the same time, its light distribution to the DMD surface only needs to be reflected once by the reflector, which can achieve higher light efficiency. The light beam reflected by the DMD passes through the imaging lens group and is incident on the target surface to form an image that can better meet the uniformity and brightness requirements of laser projection.

Claims

1. An array multi-channel multi-wavelength high-power uniform lighting distribution system, characterized by: It includes several laser light sources, free-form surface reflectors and target surfaces; The free-form surface reflector includes a plurality of free-form surfaces, the number and position of the free-form surfaces corresponding to the laser light sources, and the plurality of laser light sources and the free-form surfaces are arranged in a ring array; The light emitted by a single laser light source is projected onto the target surface through a single free-form surface, forming a light beam propagation channel; A plurality of laser light sources arranged in an annular array are projected onto a target surface through a plurality of free-form surfaces to form an array multi-beam propagation channel; The beams emitted by different laser light sources are superimposed and projected onto the target surface through the array's multi-beam propagation channels, achieving a combined improvement in power, illumination uniformity, and color uniformity. Several free-form surfaces are formed by setting a central free-form surface and then adding other free-form surfaces in a circular array around the central free-form surface; a light beam in the central area of ​​the central free-form surface is projected onto the DMD surface at an incident angle of 23°-25°. After reflection by the micromirror, the light beam is emitted within a range of plus or minus 5° with the DMD normal vector direction as the center, thereby reducing the requirements for the projection lens aperture; The free-form surface is based on the ellipse envelopment method, which calculates the numerical matrix of the optical path constant K from the focus of the laser light source to the focus of the target surface. By optimizing the K value data in the matrix, the coordinate distribution of each sub-surface of the free-form surface is obtained, and the free-form surface is fitted.

2. The array multi-channel multi-wavelength high-power uniform lighting light distribution system according to claim 1, characterized in that: The laser light source includes monochromatic laser light sources with three wavelengths: red, green and blue. The three monochromatic laser light sources are collimated, and the energy of the laser light sources is Gaussian distributed.

3. The array multi-channel multi-wavelength high-power uniform lighting light distribution system according to claim 1, characterized in that: A plurality of the laser light sources are distributed in a multi-layer annular array, and a plurality of the free-form surfaces are distributed in a multi-layer annular array, so that the overall structure is compact.

4. The array multi-channel multi-wavelength high-power uniform lighting light distribution system according to claim 1, characterized in that: The plurality of laser light sources are arranged facing the plurality of free-form surfaces, and the laser light sources correspond to the free-form surfaces at diagonal angles.

5. The array multi-channel multi-wavelength high-power uniform lighting light distribution system according to claim 1, characterized in that: The array multi-beam propagation channel independently distributes light and simultaneously projects shaped light spots onto the surface of the DMD micromirror array. The illumination of the light spots is superimposed in the corresponding areas. When the independent light spots are superimposed, the peaks and valleys of the uneven illumination are offset, thereby improving the overall illumination uniformity.

6. The array multi-channel multi-wavelength high-power uniform lighting light distribution system according to claim 1, characterized in that: The target surface is the surface of a digital micromirror device (DMD) micromirror array. The DMD micromirror array surface receives shaped light spots formed by light beams projected by various light beam propagation channels and overlaps them on the DMD micromirror array surface. The DMD micromirror array surface has two flip angles, one of which projects the incident light beam to a subsequent projection lens to complete imaging, and the other deflects the light beam to other areas to prevent it from interfering with imaging.

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