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

Abstract

The invention discloses an array multi-channel multi-wavelength high-power uniform illumination light distribution system which comprises a plurality of light beam propagation channels, a single light beam propagation channel comprises 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 a preferable mode, and the light rays are transmitted to the target surface through the free-form surface reflector. Efficient and uniform illumination is formed; the plurality of laser light sources are arranged in an annular array, and the laser light sources have a plurality of wavelengths, collimation and Gaussian distribution; the free-form surface reflector comprises a plurality of free-form surfaces which are arranged in an annular array. In conclusion, the system is compact in structure due to the preferable annular arrangement of the array multi-channel; the free-form surfaces are in one-to-one correspondence with the laser light sources in number and position; the target surface is a micro-mirror array surface of the same digital micro-mirror device (DMD). The light distribution system projects light beams emitted by different light sources on a target surface through a plurality of channels in an overlapped mode, and combined improvement of power, illuminance uniformity and chroma uniformity is achieved.

Description

Technical Field

[0001] The 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 education, business, home entertainment and other fields. However, modern projection scenes are becoming increasingly complex, and higher requirements are placed on the brightness and color performance of the projected image. Traditional projection systems usually use a single light source or color wheel design, which is difficult to meet the high brightness and uniformity requirements in high-light or large projection area environments. Especially when the scene requires higher brightness output, the stability of traditional light sources and the uniformity of the synthetic light beam still have many shortcomings. In outdoor activities, large-scale presentations, and high-brightness display scenes, users have significantly increased their demands for the brightness and color uniformity of the projected image. 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 illumination light distribution system, which aims to optimize the shortcomings of traditional projection three-color light source beam combination 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 digital micromirror device (DMD) through free-form surface light distribution reflector to achieve high uniformity of light distribution, and bypasses the problem of beam combination by directly shaping the light beam to DMD. The three-color laser light source combination of the system provides 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 the light source layout, which provides space for adding more light sources. In addition, the 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 order to solve 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 arranges more light sources to achieve high-brightness uniform lighting through free-form surface light distribution.

[0005] The technical solution of the present invention is as follows:

[0006] An array multi-channel multi-wavelength high-power uniform lighting light distribution system, the light distribution system includes multiple light beam propagation channels, a single light beam propagation channel includes a laser light source, a free-form surface and a target surface, the free-form surface projects the light emitted by the laser light source to the target surface in a preferred manner, forming efficient and uniform lighting;

[0007] A plurality of laser light sources are arranged in a ring array, and the laser light sources have multiple wavelengths, collimation and Gaussian distribution; a plurality of free-form surfaces form a free-form surface reflector, and the plurality of free-form surfaces are arranged in a ring array; the formed array multi-channels are arranged in a ring, so that the system structure is 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 correspond 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 combined improvement in power, illumination uniformity, and color uniformity.

[0011] Furthermore, the laser light source includes a monochromatic laser light source with three wavelengths of red, green and blue. The three monochromatic light sources are collimated, the light source energy is Gaussian distributed, and has high directivity. The beam divergence angle is controlled within a preset range. Multiple light sources with different wavelengths are combined in power and color to achieve a joint improvement in power, illumination uniformity and chromaticity 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, so that the overall structure is 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 mixing on the surface of the DMD micromirror array, and the light beam forms a uniform color distribution on its surface.

[0014] Furthermore, the plurality of free-form surfaces are distributed in a multi-layered annular shape, 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 the surface thereof 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 normal line of the DMD surface) and is incident on the DMD surface, and the light beam is centered in the direction of the DMD normal vector and emerges 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 emergence angles after reflection will deviate from the emergence angles of the central area, and the angles will be enlarged or reduced relative to the emergence angles of the central area; at the same time, the divergence angles of the light beams reflected to the target surface by other free-form surfaces surrounding the center will also be enlarged or reduced around the emergence 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 emergence angle of the light beam after reflection from the DMD micromirror array surface, and reducing the requirements for the aperture of the projection lens.

[0016] Furthermore, the free-form surface is based on the ellipse envelope method to calculate the numerical matrix of the optical path constant K from the light source focus to the target focus; 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 preferred free-form surface is formed by fitting. After the corresponding light beam is reflected by the free-form surface, a uniform illumination distribution can be formed on the surface of the DMD micromirror array; the light beam corresponding to each ellipse sub-surface is a conical light with a divergence angle close to 0 degrees, and a parallel light beam is used to approximate the conical light beam to optimize the 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 oppositely. 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 light beam propagation channel is reflected to the surface of the DMD micromirror array through the free-form surface, and a high uniformity illumination distribution can be obtained on the surface of the DMD micromirror array. Each light source and its corresponding free-form surface are arranged through a preferred structure to form a multi-beam propagation channel, each light beam propagation channel is independently lighted, and multiple channels simultaneously project shaped light spots to the surface of the DMD micromirror array, and the illumination of the light 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, further improving the overall illumination uniformity.

[0019] Furthermore, the DMD micromirror array surface receives shaped light spots formed by light beams projected by various light beam propagation channels, and these light spots overlap precisely on the DMD micromirror array surface; the micromirror array has two flip angles, one flip angle accurately 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 interfering with imaging; the DMD, light source, and free-form surface light distribution reflector jointly optimize the optical path through the preferred structure to ensure efficient transmission and precise projection of the light beam.

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

[0021] An array multi-channel multi-wavelength high-power uniform lighting light distribution system includes three monochromatic light sources of red, green and blue, a free-form surface reflector and a digital micromirror device (DMD); wherein the free-form surface reflector is used to evenly distribute the light beams emitted by each color light source to the surface of the DMD micromirror array, and by reasonably designing the output power ratio of the red, green and blue light sources, they are combined into white light to improve 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, and the light beams are accurately guided to the free-form surface reflector by adjusting the divergence angle of the light source; 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 superimposed structure to effectively control the incident angle of the light beam, avoid light beam dispersion, and improve the efficiency of light energy utilization; the light source adopts a ring arrangement, which makes the system structure compact, and the brightness and uniformity are further enhanced.

[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 cast problem that may occur when multiple color light sources are mixed. Because it is not limited 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 (reflective 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. More light sources can be configured in the same space to provide higher brightness.

[0025] 3) The light emitted by the light source is directly reflected to 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 have a high uniformity, thereby improving the quality of imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the design principle of a free-form surface (ellipsoid);

[0027] Figure 2 This is a simplified diagram of the reflection effect of a single sub-surface in a free-form surface;

[0028] Figure 3 Schematic diagram of the effect of a single free-form surface evenly distributing the light beam to the DMD surface;

[0029] Figure 4 Schematic diagram of the effect of 3 light sources being evenly distributed on the DMD surface through 3 free-form surfaces;

[0030] Figure 5 The diagram is a structure diagram of 3 light sources, free-form surface reflectors and their optical paths with DMD;

[0031] Figure 6 This is the illumination distribution diagram of the DMD surface after the collimated beams emitted by 3 light sources are distributed on the free-form surface;

[0032] Figure 7 It is the optical path structure diagram of 5 beams at the center and four corners of the 21 light source;

[0033] Figure 8 The optical path diagram of the first column of collimated light beams through the corresponding curved surface and the DMD surface illumination distribution diagram;

[0034] Fig. 9 The optical path diagram of the second column of collimated light beams through the corresponding curved surface and the DMD surface illumination distribution diagram;

[0035] Fig.10 The third column is a simplified diagram of the optical path of the collimated light beam through the corresponding curved surface and the DMD surface illumination distribution diagram;

[0036] Fig.11 This is the illumination distribution diagram of the DMD surface after the 21 light sources are matched by the free-form reflector;

[0037] Fig.12 This is a schematic diagram of the overall simulation of 21 light beams. DETAILED DESCRIPTION

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

[0039] An array multi-channel multi-wavelength high-power uniform illumination light distribution system, a laser light source, a free-form surface reflector and a digital micromirror device DMD;

[0040] The design principle of free-form 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 the two foci is a constant, and in the corresponding ellipsoid, the light emitted from one focus O of the ellipsoid must pass through the other focus of the ellipsoid after being reflected by the surface 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, so that 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, 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 long axis vertex is h, K can be expressed by the following formula:

[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 coordinates of the other focus T are (T x , T y , T z ), combining the above two formulas, the formula for ρ value can be obtained:

[0047]

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

[0049] The laser diode light source is small in size, usually with a diameter of only a few millimeters. 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 conical light beam with a divergence angle of nearly 0 emitted by a point light source, and an elliptical flow surface can be used to reflect it to the set target point. 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 taken as another 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 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 between the ellipsoidal surfaces can be accurately 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 accurately controlled. Through multiple iterations, the K value corresponding to each free 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 surface 3, and finally the goal of evenly distributing energy to each point on the target surface through the free 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, so 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 at the same time, the condition of evenly distributing the energy of the light source 1 to each point is satisfied, at this time, the centroid interpolation method is used to perform centroid interpolation on the coordinates constituting the same sub-surface, and 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, Figure 4 As shown, three red, green and blue collimated laser diodes 1.1, 1.2 and 1.3 are used as light sources. By properly adjusting the power ratio of each color, white light is synthesized, thereby enhancing the brightness and color balance of the system. With DMD 8 as the target surface, sufficient sub-surfaces are set for the three free-form surfaces 2.1, 2.2 and 2.3 that reflect the three-color light beams, that is, sufficient target focal points are set on the surface of DMD 3 to ensure the uniform distribution of the three-color light after free-form surface shaping on the surface of DMD.

[0052] Embodiment 1:

[0053] Using red, green and blue laser diodes as light sources, in order to ensure high precision and high brightness of the light beam, the light beam of each laser diode is first collimated by a collimating lens group. The function of the collimating lens group is to transform the laser beam from its initial divergent state into a parallel beam, ensuring that the beam can be evenly transmitted and accurately focused on 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 evenly distributed light spots 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 their optical path structure with DMD as shown in the figure Figure 5 As shown in the figure, the free-form reflector structure is composed of three independently designed free-form surfaces that are integrated into the same entity. Through this design, the light from each laser source is effectively shaped through its corresponding free-form surface and irradiated onto the DMD surface in a uniform manner.

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

[0057] Although this design can achieve high uniformity while maintaining high light efficiency, in this configuration, the number of light sources is small and the power of each light source is limited, which cannot meet the needs of laser projection systems in high-brightness scenes. Therefore, in order to further improve the brightness of the system and meet the needs of higher-brightness applications, the system may need to increase the number of light sources or increase the power of a single light source. Adding multiple light sources or adjusting the configuration of the light sources will help provide stronger light output while maintaining uniformity of illumination, 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 red light source of the selected three-color laser light source uses the ML562H84 laser diode with a wavelength of 638nm and a power of 2.5W; the green light source uses the NUGM06T laser diode with a wavelength of 525nm and a power of 1.65W; the blue light source uses the NUBM0F model with a wavelength of 455nm and an output power of 5.4W. According to the three stimulus values ​​corresponding to each wavelength in the CIE1931 standard chromaticity spectrum, the power ratio of the red, green and blue lasers synthesizing the standard white light is 2.3035:1.5049:1. Combined with the power of each color laser diode, the number of red, green and blue laser diodes in the final 21 laser diodes is 10, 9 and 2 respectively, and the total power of the three-color light is 10*2.5+9*1.65+2.5.4=50.65W. The overall 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] According to the principle of the technical solution, a free-form surface reflector matching each light source is established. The micro-mirror reflection area on the DMD surface is 16mm long and 9mm wide. The light beam emitted by each light source is shaped into a square spot of the same shape and size by the corresponding reflective free-form surface and 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 the same entity. If all laser diodes 1 are arranged in the same longitudinal space, the angle of some light beams reflected by the reflector to the surface of DMD3 is too large, and the overall divergence angle of the light beam after being reflected by the micromirror on the surface of DMD3 is too large, which will require a higher aperture of the subsequent projection lens. Therefore, a three-layer stacking structure is adopted to evenly distribute all the reflection surfaces to the three layers, so that the angle of the light beam incident on the surface of DMD3 is controlled within a certain range, reducing the requirements for the performance 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 is incident on DMD3. The column 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 with DMD3 as the center, maintaining a structure as compact as possible. The angle of the most central free-form surface incident on the center of DMD is controlled within the range of 23-25°, so that the light beam reflected by the central free-form surface can be emitted nearly vertically relative to the DMD surface after reaching the center of the DMD micromirror area (with the DMD normal vector direction as the center, within the range of plus or minus 5°), so that the overall divergence angle of the light beam reflected from the DMD micromirror area is 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, so as to control 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 to the reflector. The longitudinal spacing between the laser diodes is controlled by adjusting the opposite distance between the laser diodes and the reflector, and the overall volume of the combined laser diodes is compressed while ensuring that each laser diode has sufficient installation space.

[0063] The simulation software is used to simulate the reflective surface of each column of the free-form surface reflector and the free-form surface 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 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, and the actual simulation light path diagram is shown in FIG. Fig.12 As shown. Figure 8 , Fig. 9 , Fig.10 As shown, the collimated light beam emitted by the laser diode 1 corresponding to each column of reflectors 2 is incident on the surface of the DMD reflector 3 after being shaped and evenly distributed by the reflector. It can be seen that the illumination uniformity on the surface of the DMD reflector exceeds 0.9 after each column of light beams is shaped and distributed by the reflector. 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 illumination distribution on the corresponding DMD surface is shown as follows: Fig.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 is incident on the target surface through the imaging lens group 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 light 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 correspond to the number and position of the laser light sources one by one, and the plurality of laser light sources and the free-form surfaces are arranged in a ring array respectively; 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 light beams emitted by different laser light sources are superimposed and projected onto the target surface through the array multi-beam propagation channel, achieving a joint improvement in power, illumination uniformity and color uniformity.

2. According to claim 1, an array multi-channel multi-wavelength high-power uniform lighting light distribution system is characterized by: 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. According to claim 1, the array multi-channel multi-wavelength high-power uniform lighting light distribution system is characterized by: 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 an oblique angle.

5. The array multi-channel multi-wavelength high-power uniform lighting light distribution system according to claim 1, characterized in that: Several of the 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; the 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°, and after reflection by the micromirror, the light beam is centered in the direction of the DMD normal vector and emitted within a range of plus or minus 5°, thereby reducing the requirements for the aperture of the projection lens.

6. The array multi-channel multi-wavelength high-power uniform lighting light distribution system according to claim 1, characterized in that: The free-form surface is based on the ellipse envelopment method, and the numerical matrix of the optical path constant K from the focus of the laser light source to the focus of the target surface is calculated. 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.

7. 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 the array multi-beam propagation channel simultaneously projects shaped light spots onto the surface of the DMD micromirror array, and the illumination of the light spots is superimposed in the corresponding area. When the independent light spots are superimposed, the peaks and valleys of the uneven illumination are offset, thereby improving the overall illumination uniformity.

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

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