Method for adjusting light intensity uniformity of optical system

Abstract

The invention provides a method for adjusting the light intensity uniformity of an optical system, the optical system comprises an optical module and an LCD screen, the LCD screen comprises a plurality of target areas, each target area is associated with at least one light-emitting assembly of the optical module, and the method comprises the following steps: through the light-emitting assemblies of the optical module, adjusting the light intensity uniformity of the optical system, at least radiating light to a first target area and a second target area in a plurality of target areas of the LCD screen; determining the light intensity distribution of the light passing through the first target area and the second target area, and based on the difference of the light intensity distribution, performing at least one of the following: adjusting the driving current or PWM of the light-emitting component associated with the first target area; adjusting a driving current or PWM of a light emitting component associated with the second target area; providing or adjusting a mask associated with the first target area; or providing or adjusting a mask associated with the second target area.

Description

Technical Field

[0001] This application belongs to the technical field of 3D printing, and particularly relates to a method for adjusting the light intensity uniformity of an optical system. Background Art

[0002] With the continuous development of 3D printing technology, various types of 3D printing devices have gradually been widely used in people's lives. For example, digital light processing (DLP)-based or liquid crystal display (LCD)-based stereolithography 3D printers.

[0003] Existing LCD-based stereolithography 3D printers typically adopt an integral light source design. For example, a light source that is switched on and off simultaneously is used as a backlight, and an LCD screen is used for selective light projection.

[0004] The inventors expect to use multiple LEDs with independently controlled switches as the backlight and an LCD screen for selective light projection to obtain higher contrast. In addition, the above 3D stereolithography printing exposes simultaneously in the expected pattern area, so uniform light radiation is required. Although the theoretical optical scheme achieves uniform light radiation, it is difficult to avoid the light intensity error caused by actual component installation and manufacturing errors. Therefore, it is necessary to reduce the above light intensity error. Summary of the Invention

[0005] This application provides a method for adjusting the light intensity uniformity of an optical system. The optical system includes an optical module and an LCD screen, where the LCD screen includes multiple target areas, and each target area is associated with at least one light-emitting component of the optical module. The method includes: radiating light through the light-emitting components of the optical module to at least a first target area and a second target area among the multiple target areas of the LCD screen; determining the light intensity distribution of the light passing through the first target area and the second target area, and based on the difference in the light intensity distribution, performing at least one of the following: adjusting the drive current or PWM of the light-emitting component associated with the first target area; adjusting the drive current or PWM of the light-emitting component associated with the second target area; providing or adjusting a mask associated with the first target area; or providing or adjusting a mask associated with the second target area.

[0006] In some embodiments, each target area includes one or more display areas, and each display area is irradiated by at least one light-emitting component.

[0007] In some embodiments, each display area is irradiated by a single light-emitting component; or each display area is irradiated by a single central light-emitting component and at least one light-emitting component arranged adjacent to the central light-emitting component.

[0008] In some embodiments, determining the light intensity distribution of light passing through the first target area and the second target area includes: detecting the light intensity at the first target area and the second target area of the LCD screen using a light intensity detection device.

[0009] Further, when the light intensity of the first target area is greater than that of the second target area, a mask associated with the first target area is provided or adjusted.

[0010] In some embodiments, determining the light intensity distribution of light passing through the first target area and the second target area includes: acquiring images of the first target area and the second target area of the LCD screen using an image acquisition device, and determining the gray-scale distribution of the images.

[0011] In some embodiments, the difference in the light intensity distribution includes the difference in the gray-scale values of the images.

[0012] Further, the image includes a first part associated with the first target area and a second part associated with the second target area, and when the gray scale of the first part is greater than that of the second part, a mask associated with the first target area is provided or adjusted.

[0013] In some embodiments, the mask is configured in a multiplicative operation or an additive operation.

[0014] In some embodiments, the foregoing method further includes at least one of the following: measuring the light intensity of the light-emitting component associated with the first target area under different drive currents or PWMs; or measuring the light intensity of the light-emitting component associated with the second target area under different drive currents or PWMs.

[0015] Further, adjusting the drive current or PWM of the light-emitting component associated with the first target area includes: adjusting the drive current or PWM of the light-emitting component associated with the first target area based on multiple sets of measured data associated with the first target area; or adjusting the drive current or PWM of the light-emitting component associated with the second target area includes: adjusting the drive current or PWM of the light-emitting component associated with the second target area based on multiple sets of measured data associated with the second target area.

[0016] In some embodiments, the method further includes at least one of the following: measuring the light intensity at the first target area under different drive currents or PWMs of the light-emitting component associated with the first target area; or measuring the light intensity at the second target area under different drive currents or PWMs of the light-emitting component associated with the second target area.

[0017] In some embodiments, adjusting the drive current or PWM of the light-emitting components associated with the first target area includes: adjusting the drive current or PWM of the light-emitting components associated with the first target area based on multiple sets of measured data associated with the first target area; or adjusting the drive current or PWM of the light-emitting components associated with the second target area includes: adjusting the drive current or PWM of the light-emitting components associated with the second target area based on multiple sets of measured data associated with the second target area.

[0018] The present application also provides a method for manufacturing a three-dimensional object by radiation, which includes: using the foregoing method to adjust the light intensity uniformity of the optical system; radiating light through the first set of light-emitting components of the optical system so that the light passes through the LCD screen of the optical system and radiates the printing material to obtain the first layer of the three-dimensional object; radiating light through the second set of light-emitting components of the optical system so that the light passes through the LCD screen of the optical system and radiates the printing material to obtain the second layer of the three-dimensional object, where the first set of light-emitting components is different from the second set of light-emitting components.

[0019] In some embodiments, at the bottom of the printing material, the light passing through the LCD screen of the optical system cures the printing material; or at the liquid surface of the printing material, the light passing through the LCD screen of the optical system cures the printing material. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is one of the optical path schematic diagrams of the optical system provided by the embodiments of the present application;

[0022] Figures 2A - 2B It is a schematic diagram of the energy distribution of the light spot formed after the light emitted by the optical components provided by some embodiments of the present application passes through the collimating component;

[0023] Figure 3 It is the energy distribution curve before and after the light emitted by multiple optical components passed through by the embodiments of the present application is fused on the target plane;

[0024] Figure 4 It is the optical path schematic diagram of the optical system provided by some embodiments of the present application;

[0025] Figure 5 It is the optical path schematic diagram of the optical system provided by other embodiments of the present application;

[0026] Figures 6A - 6B It is the light intensity distribution diagram before and after the light emitted by the optical component provided in the embodiment of the present application passes through the diffuser;

[0027] Figures 7A - 7B It is the light intensity distribution curve combined by multiple light spots provided in some embodiments of the present application;

[0028] Figures 8A - 8C It is a schematic diagram of an optical system with a mask provided in some embodiments of the present application;

[0029] Figures 9A - 9D It is a schematic diagram of an optical system with a mask provided in some embodiments of the present application;

[0030] Figures 10A - 10F It is a schematic diagram of the layout method of a light-emitting component or a collimating lens provided in some embodiments of the present application;

[0031] Figure 11 It is a schematic diagram of the optical path of an optical system with a light-shielding element provided in the embodiment of the present application;

[0032] Figures 12A - 12E It is a schematic diagram of the structure of an optical module provided in the embodiment of the present application;

[0033] Figure 13 It is a schematic diagram of the structure of a light-shielding element provided in the embodiment of the present application;

[0034] Figure 14 It shows a light-curing 3D printing device according to some embodiments;

[0035] Figure 15 It shows a light-curing 3D printing device according to some embodiments;

[0036] Figure 16 It is a schematic diagram of the circuit of the optical system provided in the embodiment of the present application;

[0037] Figure 17 It is a schematic diagram of the circuit of the optical system provided in the embodiment of the present application;

[0038] Figure 18 It is a schematic diagram of the circuit of the optical system provided in the embodiment of the present application;

[0039] Figure 19 It is a schematic diagram of the circuit of the optical system provided in the embodiment of the present application;

[0040] Figure 20 It is a schematic diagram of the circuit of the optical system provided in the embodiment of the present application;

[0041] Figure 21 It is a schematic diagram of the circuit of the optical system provided in the embodiment of the present application;

[0042] Figure 22 is a schematic circuit diagram of a current amplification circuit provided by an embodiment of the present application;

[0043] Figure 23 is a schematic circuit diagram of a current amplification circuit provided by an embodiment of the present application;

[0044] Figure 24 is a schematic circuit diagram of a power supply circuit in an optical system provided by an embodiment of the present application;

[0045] Figure 25 is a schematic circuit diagram of a DC-DC buck circuit provided by an embodiment of the present application;

[0046] Figure 26 is a schematic circuit diagram of an optical system provided by an embodiment of the present application;

[0047] Figure 27 is a schematic circuit diagram of an optical system provided by an embodiment of the present application;

[0048] Figure 28 is a schematic circuit diagram of an optical system provided by an embodiment of the present application;

[0049] Figure 29 shows an optical system according to some embodiments;

[0050] Figure 30 shows an LCD screen having multiple regions according to some embodiments;

[0051] Figure 30 shows an image of a single region of an LCD screen according to some embodiments;

[0052] Figure 31 shows the gray-scale distribution of an image of an entire LCD screen according to some embodiments;

[0053] Figure 32 shows for Figure 33 a mask of the screen;

[0054] Figure 34 shows the gray-scale distribution of the image after applying the mask;

[0055] Figure 35 shows the current curve of a screen light intensity - light emitting component according to some embodiments;

[0056] Figure 36 shows a light emitting component according to some embodiments;

[0057] Figure 37 shows the gray-scale distribution of images of all light emitting components of a light emitting module according to some embodiments;

[0058] Figure 38 shows the light intensity - PWM curve of a light - emitting component according to some embodiments;

[0059] Figure 39 shows the gray - level distribution of the image of the adjusted light - emitting component. Detailed implementation manners

[0060] In the following description, for the purpose of illustration rather than limitation, specific details such as specific system architectures, technologies, etc. are presented to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well - known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0061] In addition, in the description of the specification of the present application and the appended claims, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0062] The reference to "one embodiment" or "some embodiments" etc. described in the specification of the present application means that specific features, structures, or characteristics described in combination with that embodiment are included in one or more embodiments of the present application. Thus, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "comprising", "including", "having", and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways. "A plurality" means "two" or "more than two".

[0063] Please refer to Figure 1 , the optical system provided by the embodiments of the present application includes a light - emitting component 101, a collimating component 102, and a controller. The light - emitting component 101 is configured to emit light. There are multiple light - emitting components 101 and multiple collimating components 102. Each light - emitting component 101 is configured with one collimating component 102. The collimating component 102 is used to collimate the light emitted by the corresponding light - emitting component 101. The controller is electrically connected to each light - emitting component 101 and can individually control the startup or shutdown of each light - emitting component 101, or control the light - emitting intensity of the light - emitting component 101.

[0064] Light from the light-emitting component 101 passes through the collimating component 102 and irradiates on the target plane 104 to form an illumination area. The illumination areas of two adjacent light-emitting components 101 at least partially overlap to form an overlapping area, and the light intensity of the overlapping area is 80% - 120% of the light intensity of the non-overlapping area in the illumination area, preferably 85% - 115%, preferably 90% - 110%, preferably 95% - 105%, such as 96%, 97%, 98%, 99%, 100%, 101%, 102%, 103%, 104%, 105%.

[0065] The light spot formed by each light-emitting component 101 on the target plane 104 is divided into a central area S201 and a peripheral area S202, and the light intensity of the central area S201 is greater than that of the peripheral area S202. Among them, the light intensity of the central area S201 is basically uniform, and the light intensity of the peripheral area S202 gradually decreases along the direction away from the central area. Taking the example that a single light-emitting component 101 forms a quadrilateral light spot on the target plane 104, refer to Figure 2A , the light intensity of the light spot is strong and uniform in the central area S201, and gradually decreases to zero along the direction away from the central area in the peripheral area S202, and the light intensity distribution is generally an isosceles trapezoid.

[0066] In related designs, bright spots or dark spots are likely to appear in the combined light spots formed by multiple light-emitting components 101, resulting in uneven light spots. Refer to Figure 2B , the light spots formed by two adjacent light-emitting components 101 on the target plane 104 have an overlapping area S210, and the overlapping area S210 is formed by the overlapping of the peripheral areas S202 of the two light spots, for example.

[0067] To avoid bright spots or dark spots, the light intensity of the peripheral area S202 is enhanced through overlapping and is basically consistent with the light intensity of the central area S201. In one example, after one light-emitting component 101 emits light, other light-emitting components 101 adjacent to this light-emitting component 101 are controlled to emit light, so that the light intensity of the peripheral area of the light spot of this light-emitting component 101 on the target plane is increased due to the adjacent light-emitting components 101, so that the light intensity of the overlapping area S210 of the light spot is basically consistent with the light intensity of the central area S201.

[0068] In one example, the first light-emitting component 101 forms a first illumination area on the target plane 104, and the second light-emitting component 101 adjacent to the first light-emitting component 101 forms a second illumination area on the target plane 104. The first illumination area and the second illumination area form an overlapping area on the target plane 104, and the light intensity of the overlapping area is the sum of the irradiation light intensity of the first light-emitting component in the overlapping area and the irradiation light intensity of the second light-emitting component in the overlapping area. The light intensity of the non-overlapping area in the first illumination area is the irradiation light intensity of the first light-emitting component at the central area of the first illumination area. The light intensity of the non-overlapping area in the second illumination area is the irradiation light intensity of the second light-emitting component at the central area of the second illumination area.

[0069] In one example, the light intensity of the non-overlapping area in the first illumination area is the same as the light intensity of the non-overlapping area in the second illumination area. The light intensity of the overlapping area is 80% - 120% of the light intensity of the non-overlapping area in the first illumination area and is also 80% - 120% of the light intensity of the non-overlapping area in the second illumination area. Thus, the first illumination area and the second illumination area are fused to form a uniform light spot. For example, the light intensity (light power density) of the non-overlapping area in the first illumination area is 30 mW / cm 2 ², the light intensity of the non-overlapping area in the second illumination area is 30 mW / cm 2 ², and the light intensity of the overlapping area of the first or second illumination area is 28 mW / cm 2 ², 29 mW / cm 2 ², 30 mW / cm 2 ², 31 mW / cm 2 ², 32 mW / cm 2 ².

[0070] In one example, the light intensity of the non-overlapping area in the first illumination area is different from the light intensity of the non-overlapping area in the second illumination area. The light intensity of the overlapping area is 80% - 120% of the light intensity of the non-overlapping area in the first illumination area and is also 80% - 120% of the light intensity of the non-overlapping area in the second illumination area. Thus, the first illumination area and the second illumination area are fused to form a uniform light spot. For example, the light intensity of the non-overlapping area in the first illumination area is 30 mW / cm 2 ², the light intensity of the non-overlapping area in the second illumination area is 35 mW / cm 2 ², and the light intensity of the overlapping area of the first or second illumination area is 30 mW / cm 2 ², 31 mW / cm 2 ², 32 mW / cm 2 ², 33 mW / cm 2 ², 35 mW / cm 2 ².

[0071] The light emitted by the light-emitting component 101 is ultraviolet light or visible light of a specific wavelength and energy, and the light can act on the printing material to achieve a curing effect. In one embodiment, each light-emitting component 101 has only one LED. In another embodiment, the light-emitting component 101 includes two, three, or more LEDs. When the light-emitting component 101 includes multiple LEDs, the light wavebands emitted by the multiple LEDs in the same light-emitting component 101 can be the same or different. The structures of the multiple light-emitting components 101 can be the same or different. For example, some of the multiple light-emitting components 101 include only one LED, and some of the multiple light-emitting components 101 include multiple LEDs. Or, each light-emitting component 101 includes multiple LEDs.

[0072] "LED" in this article includes various types of LEDs, such as Mini Led and Micro Led. The chip size of the LEDs in this article is, for example, 20μm to 500μm, for example, 40μm to 400μm, for example, 50μm to 200μm.

[0073] In some embodiments, the target plane 104 is an LCD screen.

[0074] In some embodiments, the target plane 104 is the film of a tray containing the printing material.

[0075] In some embodiments, the target plane 104 is a mask.

[0076] In some embodiments, the target plane 104 is the plane between the light-emitting component and the LCD screen.

[0077] In some embodiments, the target plane 104 is the liquid surface of the printing material contained in the tray. For example, the light emitted by the light-emitting component 101 directly or indirectly irradiates the liquid surface (upper surface) of the printing material.

[0078] Based on the pattern of the slice layer to be cured of the object, the controller controls at least one of all the light-emitting components 101 to emit light. All the light-emitting components of the optical system are independently controlled. For example, the controller can control 10, 20, or 50 light-emitting components among all the light-emitting components 101 to emit light simultaneously, rather than having to start or turn off all the light-emitting components at the same time.

[0079] In some embodiments, through the design of the installation spacing between two adjacent light-emitting components, the light intensity in the overlapping area of the light spots of two adjacent light-emitting components on the target plane is 80% to 120% of the light intensity in the non-overlapping area. For example, the light intensity in the overlapping area is 90%, 100%, or 110% of the light intensity in the non-overlapping area of the first area.

[0080] In the optical system provided by this application, multiple light-emitting components 101 are independently controlled by a controller. During printing, the controller controls one or more corresponding light-emitting components 101 to emit light. Compared with the existing situation where all light-emitting components are either fully on or fully off, energy can be saved. In addition, in a 3D printer with an LCD screen, as a mask, the LCD screen may allow unwanted light to pass through (for example, when the gray level is set to 0). Although the intensity of the light passing through is attenuated, this is still disadvantageous. Some of the light-emitting components 101 in the optical system of this application emit light during operation, while the remaining light-emitting components 101 do not emit light, basically avoiding unwanted light from passing through the mask or the LCD screen and improving the contrast.

[0081] There are 100 to 15,000 light-emitting components 101 installed on the mounting plate. For example, 1,000 light-emitting components 101 are installed on the mounting plate. The overlapping area of two adjacent light-emitting components 101 on the target plane 104 is associated with the mounting dimensions of these two light-emitting components 101.

[0082] For a certain type of stereolithography 3D printing device, the area for exposure is limited by the device size, so the area of the mounting plate (on which multiple light-emitting components are installed) is also limited. Those skilled in the art can understand that on a mounting plate of the same area, a larger number of light-emitting components 101, such as 2,000, can be installed, or a smaller number of light-emitting components 101, such as 180, can be installed. Different numbers of light-emitting components 101 are suitable for different mounting dimensions (such as mounting pitch) and structural designs. In addition, different numbers of light-emitting components 101 are suitable for different types (such as different sizes) of LEDs.

[0083] In some embodiments, multiple (such as 200) light-emitting components 101 are installed on the mounting plate. The arrangement of these light-emitting components 101 allows the light spots of two adjacent light-emitting components 101 on the target plane 104 to have an overlapping area, for example, only overlapping in the edge area of the light spot.

[0084] In some embodiments, multiple (such as 1,000) light-emitting components 101 are installed on the mounting plate, and these light-emitting components 101 are compact. Limited by this compact arrangement and the propagation distance of the light emitted by the light-emitting components, the mixing distance (optical distance) of adjacent light-emitting components 101 is inevitable. In other words, the light spots of two adjacent light-emitting components 101 on the target plane 104 have an overlapping area, for example, overlapping in a part of the central area and the edge area of the light spot, which makes the light intensity of at least a part of the overlapping area always undesirably greater than that of the non-overlapping area. At least to avoid this defect, this application makes the area / length of the overlapping area of two adjacent light spots account for half of the area / length of a single light spot (for example, refer to Figure 4 ), which will be described in detail later.

[0085] In some embodiments, the light intensity of the light spot formed after the light emitted by each light-emitting component passes through the collimating component is approximately arranged in an isosceles trapezoid. Refer to Figure 3 , and the light intensity of the light spot formed after the light emitted by the three light-emitting components is fused on the target plane is higher in the overlapping area than in the non-overlapping area. In some embodiments, the light intensity in the overlapping area may also be lower than that in the non-overlapping area.

[0086] Refer to Figure 4 , the optical system includes a light-emitting component 401, a collimating component 402, and a compound eye array (or diffuser) 403. The compound eye array 403 is disposed on the side of the collimating component 402 away from the light-emitting component 401 for diffusing the light passing through the collimating component 402. The light passing through the compound eye array 403 forms a plurality of light spots on the target plane 404, and adjacent light spots have an overlapping area.

[0087] Refer to Figure 6A The left light spot image in , for example, the light spot formed by the light emitted by a single light-emitting component 401 after passing through the collimating component 402 and before entering the compound eye array 403 is a regular hexagon, and the light intensity in the central area of the light spot is stronger, while the light intensity in the edge area of the light spot is weaker. Refer to Figure 6A The right light spot image in , for example, after the light emitted by a single light-emitting component 401 passes through the collimating component 402 and the compound eye array 403 in sequence, it diffuses around, the area of the central area maintaining the original light intensity shrinks, the area of the edge area expands, and the total area of the light spot expands.

[0088] Taking the light emitted by each light-emitting component 401 forming a regular hexagon light spot on the target plane as an example, refer to Figure 6B The left illumination area in , the light spots of multiple light-emitting components 401 before entering the compound eye array 403 are formed by splicing multiple regular hexagons. At this time, there is a significant difference in the light intensity between the overlapping area (in the edge area of the regular hexagon) and the non-overlapping area (in the central area of the regular hexagon), resulting in bright spots during printing. Refer to Figure 6B The right illumination area in , the light intensity in most areas (central area) of the combined light spot formed on the target plane 404 after the light emitted by multiple light-emitting components 401 is adjusted by the compound eye array 403 is basically the same.

[0089] Refer to Figure 4 and Figure 6A, thus, when multiple light-emitting components 401 emit light, after the light rays emitted by each light-emitting component 401 are adjusted by the collimating component 402 and the fly-eye array 403, they will spread more into the illumination area of adjacent light-emitting components 401. At the same time, the light rays emitted by adjacent light-emitting components 401 will also spread more into the illumination area of this light-emitting component 401. Thus, the size of the overlapping area is increased, and through the superposition of the light rays adjacent to multiple light-emitting components 401, uniform distribution of light energy is achieved. The center-axis spacing between two adjacent light-emitting components 401 is d. After the light rays emitted by each light-emitting component 401 pass through the corresponding collimating component 402 and are diffused by the fly-eye array 403, a light spot with a diameter of D is formed on the target plane 404. Among them, D > d.

[0090] In some embodiments, the central axis of the light-emitting component 401 refers to the geometric center of the LED.

[0091] In Figure 4 In the illustrated embodiment, three light-emitting components 401 are arranged along a predetermined direction such that the light rays emitted by the middle light-emitting component 401 approach or reach the central axes of the light-emitting components 401 on both sides after passing through the collimating component 402 and the fly-eye array 403. Similarly, the light rays emitted by each of the light-emitting components 401 on both sides approach or reach the central axis of the middle light-emitting component 401 after passing through the collimating component 402 and the fly-eye array 403. Those skilled in the art can understand that along the predetermined direction in which the light-emitting components 401 are arranged, the length of the overlapping area between the light spot formed by the middle light-emitting component 401 and the light spot formed by an adjacent single light-emitting component 401 is equal to the length of the non-overlapping area. In other words, along the predetermined direction in which the light-emitting components 401 are arranged, the length of the overlapping area between the light spot formed by the middle light-emitting component 401 and the light spot formed by an adjacent single light-emitting component 401 is equal to half of the length of the light spot. As Figure 4 shown, D = 2d, and the light intensity of the overlapping area of the light spot is determined by two light-emitting components 401.

[0092] In Figure 5In the illustrated embodiment, eight light-emitting components 411 are arranged in a predetermined direction such that the light emitted by the third light-emitting component 411 approaches or reaches the central axes of the first and fifth light-emitting components 411 after passing through the collimating component 412 and the fly-eye array 413. Similarly, the light emitted by the fourth light-emitting component 411 approaches or reaches the central axes of the second and sixth light-emitting components 411 after passing through the collimating component 412 and the fly-eye array 413. Similarly, the light emitted by the fifth light-emitting component 411 ultimately approaches or reaches the central axes of the third and seventh light-emitting components 411. The light emitted by the sixth light-emitting component 411 ultimately approaches or reaches the central axes of the fourth and eighth light-emitting components 411. Those skilled in the art can understand that along the predetermined direction in which the light-emitting components are arranged, the length of the overlapping region between the light spot formed by the middle light-emitting component and the light spot formed by the adjacent single light-emitting component is equal to one-fourth of the length of the light spot. As Figure 5 shown, D = 4d, and the light intensity of the overlapping region of the light spot is determined by four light-emitting components.

[0093] Similarly, D = 2*d*n. Where D is the length / diameter of the light spot formed after the light emitted by a single light-emitting component is collimated and diffused; d is the distance between the central axes of two adjacent light-emitting components; n is an integer, such as 1, 2, 3, 4.

[0094] In Figure 4 and Figure 5 the illustrated embodiment, a first light-emitting component and a second light-emitting component adjacent to the first light-emitting component in a predetermined direction are arranged. The illumination area of the first light-emitting component and the illumination area of the second light-emitting component partially overlap and have an overlapping region.

[0095] In Figure 4 , along the aforementioned predetermined direction, the length of the overlapping region is half of the length of the illumination area of the first light-emitting component or the second light-emitting component. Due to the arrangement of the diffuser, when only the first light-emitting component and the second light-emitting component are activated, the total light intensity of the overlapping region is 80% - 120% of the light intensity of the non-overlapping region of the illumination area of the first light-emitting component or the second light-emitting component.

[0096] In Figure 5 , along the aforementioned predetermined direction, the length of the overlapping region is three-fourths of the length of the illumination area of the first light-emitting component or the second light-emitting component. Due to the arrangement of the diffuser, the light spot size becomes larger and the light intensity uniformity of a single light spot becomes lower. When only the first light-emitting component and the second light-emitting component are activated, the total light intensity of the overlapping region is, for example, 180% - 300% of the light intensity of the non-overlapping region of the illumination area of the first light-emitting component or the second light-emitting component. When eight light-emitting components adjacent in a predetermined direction are activated, the light intensity of the overlapping region simultaneously affected by four light-emitting components is substantially uniform.

[0097] For example, the light intensity of the non-overlapping area of the illumination area of the first light-emitting component is 30 mW / cm 2 , and the light intensity of the overlapping area of the illumination area of the first light-emitting component (i.e., the overlapping area of the illumination area of the second light-emitting component) is 60 mW / cm 2 , and the light intensity of the non-overlapping area of the illumination area of the second light-emitting component is 30 mW / cm 2 .

[0098] It can be understood that if three or more light-emitting components adjacent along a predetermined direction are started simultaneously, all of the illumination areas of one or more of these light-emitting components partially overlap with other light-emitting components. For example, the illumination area of one light-emitting component overlaps with two adjacent illumination areas simultaneously (see Figure 4 ), or the illumination area of one light-emitting component overlaps with three adjacent illumination areas simultaneously (see Figure 5 ).

[0099] Refer to Figure 7A , the light intensity distribution of the light spot after the light emitted by the light-emitting component 401 passes through the collimating component 402 and the fly-eye array 403 is parabolic (i.e., high light intensity in the middle and low light intensity at the edge). The light emitted by three light-emitting components 401 passes through the collimating component 402 and the fly-eye array 403 in sequence and then fuses on the target plane 404, and the fused light spot is approximately an isosceles trapezoid. In other words, the light intensity of most areas of the area irradiated by the light-emitting component is uniform. Refer to Figure 7B , the light spot size of the light emitted by a single light-emitting component 401 is larger after passing through the collimating component 402 and the fly-eye array 403, and the light emitted by three light-emitting components 401 passes through the collimating component 402 and the fly-eye array 403 in sequence and then fuses on the target plane 404. Different from Figure 7A , Figure 7B the area irradiated by the light-emitting component is affected by at most three light-emitting components at most, while Figure 7A the area irradiated by the light-emitting component is affected by at most two light-emitting components at most.

[0100] Combined with Figures 4 - 5 and Figures 7A - 7B , adjusting the distance between the fly-eye array 403 and the target plane 404 can control the size and light intensity of the light spot formed on the target plane 404.

[0101] For some embodiments with limited installation size, Figures 4 - 5 the shown scheme is advantageous, which makes full use of the coverage rate of the overlapping area to achieve uniform light intensity instead of avoiding the appearance of the overlapping area.

[0102] In one embodiment of the present application, only one of the rear surface type and the front surface type of each cell of the compound eye array 403 is a convex surface. In another embodiment of the present application, both the rear surface type and the front surface type of each cell of the compound eye array 403 are convex surfaces.

[0103] In one embodiment of the present application, the cells of the compound eye array 403 are distributed in a honeycomb arrangement. In addition, the cells of the compound eye array 403 can also be arranged in a matrix or a spiral. As long as the size of each cell in the compound eye array 403 is smaller than the size of each cell in the collimating component 402.

[0104] In another embodiment of the present application, the collimation angle of the collimating component 402 (the angle of the light emitted by the light-emitting component after being collimated relative to the central axis of the light-emitting component) is -10° to 10°, preferably -5° to 5°, more preferably -2° to 2°. For example, 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°.

[0105] Referring to FIG. 8, the optical system is configured with a first mask 805 to permanently reduce the light intensity of a part of the light emitted by the light-emitting component 801. Refer to Figure 8A The optical system includes a light-emitting component 801, a collimating component 802, a first mask 805, and a controller. The light-emitting component 801 is configured to emit light. There are multiple light-emitting components 801 and collimating components 802, and each light-emitting component 801 is configured with a collimating component 802. The collimating component 802 is used to collimate the light emitted by the corresponding light-emitting component 801. The first mask 805 is located between the collimating component 802 and the target plane 804. The controller is electrically connected to each light-emitting component 801 and can independently control each light-emitting component 801.

[0106] Refer to Figure 8B The optical system includes a light-emitting component 801, a collimating component 802, a first mask 805, a compound eye array 803, and a controller. The light-emitting component 801 is configured to emit light. There are multiple light-emitting components 801 and collimating components 802, and each light-emitting component 801 is configured with a collimating component 802. The collimating component 802 is used to collimate the light emitted by the corresponding light-emitting component 801. The first mask 805 is located between the collimating component 802 and the compound eye array 803. The compound eye array 803 is disposed on the side of the collimating component 802 away from the light-emitting component 801, and the compound eye array 803 is used to diffuse the light passing through the collimating component 802. The light emerging from the compound eye array 803 forms an illumination area on the target plane 804. The controller is electrically connected to each light-emitting component 801 and can independently control each light-emitting component 801.

[0107] Refer to Figure 8C, in some embodiments, the first mask 805 includes a frosted area 822 and a transparent area 821. The transparent area 821 is correspondingly arranged with the non-overlapping area of the light-emitting component 801, and the frosted area 822 is correspondingly arranged with the overlapping area to reduce the light intensity of the overlapping area.

[0108] The first mask 805 is configured to permanently reduce the light intensity of the light emitted by the plurality of light-emitting components 801. The frosted area 822 reduces the intensity of the light while the light passes through, and the transparent area 821 allows the light to pass through smoothly. Specifically, the energy distribution curve of the light emitted by the light-emitting component 801 is an isosceles trapezoid after passing through the collimating component 802, and the waist area of the isosceles trapezoid is modulated by the frosted area 822 of the first mask 805.

[0109] Referring to FIG. 9, the optical system includes a second mask 906, and the second mask 906 is configured to selectively reduce the light emitted by the plurality of light-emitting components 901. In one embodiment, referring to Figure 9A , the optical system includes a light-emitting component 901, a collimating component 902, a second mask 906, and a controller. The light-emitting component 901 is configured to emit light. There are a plurality of light-emitting components 901 and collimating components 902, and each light-emitting component 901 is configured with a collimating component 902. The collimating component 902 is used to collimate the light emitted by the corresponding light-emitting component 901. The light passing through the collimating component 902 irradiates on the second mask 906. The second mask 906 is a mask structure arranged in front of the target plane 904, and the light forms an illumination area on the target plane 904 after passing through the second mask 906. The controller is electrically connected to each light-emitting component 901 and can independently control each light-emitting component 901. In addition, the second mask 906 can be the target plane 904, and the light forms an illumination area directly on the second mask 906 after passing through the collimating component.

[0110] Referring to Figure 9B , the optical system includes a light-emitting component 901, a collimating component 902, a compound eye array 903, a second mask 906, and a controller. The light-emitting component 901 is configured to emit light. There are a plurality of light-emitting components 901 and collimating components 902, and each light-emitting component 901 is configured with a collimating component 902. The collimating component 902 is used to collimate the light emitted by the corresponding light-emitting component 901. The compound eye array 903 is arranged on the side of the collimating component 902 away from the light-emitting component 901, and the compound eye array 903 is used to diffuse the light passing through the collimating component 902. The second mask 906 is a mask structure in front of the target plane 904, and the light passing through the compound eye array 903 irradiates on the second mask 906 and then forms an illumination area on the target plane 904. The controller is electrically connected to each light-emitting component 901 and can independently control each light-emitting component 901. Alternatively, the second mask 906 can be the target plane 904.

[0111] SeeFigure 9C , the optical system includes a light-emitting component 901, a collimating component 902, a first mask 905, a second mask 906, and a controller. The light-emitting component 901 is configured to emit light. There are multiple light-emitting components 901 and collimating components 902, and each light-emitting component 901 is configured with a collimating component 902. The collimating component 902 is used to collimate the light emitted by the corresponding light-emitting component 901. The second mask 906 is the target plane 904. The light passing through the collimating component 902 first passes through the first mask 905 and is permanently reduced in light intensity and then irradiates on the second mask 906. The controller is electrically connected to each light-emitting component 901 and can individually control each light-emitting component 901.

[0112] Refer to Figure 9D , the optical system includes a light-emitting component 901, a collimating component 902, a first mask 905, a compound eye array 903, a second mask 906, and a controller. The light-emitting component 901 is configured to emit light. There are multiple light-emitting components 901 and collimating components 902, and each light-emitting component 901 is configured with a collimating component 902. The collimating component 902 is used to collimate the light emitted by the corresponding light-emitting component 901. The compound eye array 903 is arranged on the side of the collimating component 902 away from the light-emitting component 901, and the compound eye array 903 is used to diffuse the light passing through the collimating component 902. The first mask 905 is arranged between the collimating component 902 and the compound eye array 903. The second mask 906 is arranged on the side of the compound eye array 903 away from the collimating component 902. Optionally, the second mask 906 is a mask structure in front of the target plane 904. The light passing through the compound eye array 903 irradiates on the second mask 906, and after passing through the second mask 906, it irradiates on the target plane 904 to form an illumination area. The controller is electrically connected to each light-emitting component 901 and can individually control each light-emitting component 901. In addition, the second mask 906 can also directly serve as the target plane, and the light passing through the compound eye array 903 directly forms a printed image on the second mask 906.

[0113] The second mask 906 only allows light in specific areas to pass through, can selectively reduce the intensity of local light, thereby forming a specific pattern and curing the printing material.

[0114] The arrangement of the light-emitting components in this application and the splicing of the collimating lenses in the collimating component will be introduced below with reference to FIG. 10.

[0115] The arrangement of multiple light-emitting components 1001 can be matrix, honeycomb, or spiral, or can be randomly arranged. The shape of each collimating lens in the collimating component can be geometric shapes such as square, circular, and regular hexagon. The array pattern of each lens in the compound eye array is the same as the array pattern of each collimating lens in the collimating component. Refer to Figure 10A, multiple light-emitting components 1001 are arranged in a square array, the collimating lens 1011 is rectangular, and the light-emitting center of the light-emitting component 1001 coincides with the center of the collimating lens 1011.

[0116] Refer to Figure 10B , multiple light-emitting components 1001 are arranged in a square array, the collimating lens 1021 is circular, multiple circular collimating lenses 1021 are arranged in a square array, and the light-emitting center of the light-emitting component 1001 is located at the center of the circular collimating lens 1021.

[0117] Refer to Figure 10C and Figure 10D , multiple light-emitting components 1001 are arranged in a staggered pattern with multiple rows and columns. Refer to Figure 10C , the collimating lens includes a square lens 1041 and an octagonal lens 1031, and the square lens 1041 is located in the gap formed after the octagonal lenses 1031 are spliced. Refer to Figure 10D , the collimating lens is a circular lens, larger circular lenses 1051 are arranged in a square array, and smaller circular lenses 1061 are embedded in the splicing gaps of the circular lenses 1051. Refer to Figure 10E , multiple regular hexagonal collimating lenses 1071 are spliced. Refer to Figure 10F , multiple circular collimating lenses 1081 are randomly arranged, and the light-emitting center of the light-emitting component 1001 is coaxially arranged with the center of the collimating lens 1081.

[0118] Refer to Figure 11 , the optical system includes a light-emitting component 1101, a light-shielding element 1107, a collimating component 1102, and a compound eye array 1103. The light-shielding element 1107 (such as a grating) is arranged between the light-emitting component 1101 and the collimating component 1102. The light-shielding element 1107 includes multiple channels, and the multiple channels are arranged in one-to-one correspondence with the multiple light-emitting components 1101, so that each channel allows only the light emitted by the corresponding light-emitting component 1101 to pass through. The light passing through the channels sequentially passes through the collimating component 1102 and the compound eye array 1103 and irradiates on the target plane 1104 to form an illumination area. The light intensity in the overlapping area of the multiple light-emitting components 1101 is 80% - 120% of the light intensity in the non-overlapping area.

[0119] The central axis of the channel is coaxial with the central axis of the light-emitting component 1101. Each light-emitting component 1101 uses the light-shielding element 1107 to ensure the expected light projection shape. For example, multiple regular hexagonal channels are provided in the light-shielding element 1107, and the light emitted by the light-emitting component 1101 forms a regular hexagonal light projection area after passing through the channels. In addition, the channels can also be geometric shapes such as triangles, rectangles, regular octagons, and regular decagons.

[0120] The optical system provided by the embodiment of the present application can reduce the interference between the light from a single light-emitting component 1101 and the light from an adjacent light-emitting component 1101 by arranging a light-shielding element 1107 between the light-emitting component 1101 and the collimation interval.

[0121] Each light-emitting component 1101 includes at least one LED. The optical system further includes a dead pixel detection device for detecting whether the LED is damaged. The controller controls each light-emitting component 1101 according to the detection information of the dead pixel detection device. In one embodiment, if the dead pixel detection device detects that the LED is damaged, the controller controls the exposure area on the LCD screen to move, and replaces the damaged light-emitting component 1101 by lighting the undamaged light-emitting component 1101. In another embodiment, if the dead pixel detection device detects that the LED is damaged, the controller controls multiple light-emitting components 1101 to move so that the light-emitting components 1101 corresponding to the exposure area on the LCD screen are all undamaged light-emitting components 1101. In yet another embodiment, if the dead pixel detection device detects that the LED is damaged, the controller controls the light-emitting component 1101 adjacent to the damaged LED to increase the light intensity.

[0122] In another embodiment of the present application, the light-emitting component includes multiple LEDs, and the light rays emitted by the multiple LEDs in the same light-emitting component have the same wavelength band. By arranging two, three or more LEDs in each light-emitting component, when one of the LEDs is damaged, it is ensured that the light-emitting component can still be used normally, and the light intensity of the display area corresponding to the light-emitting component is basically zero after a single LED is damaged.

[0123] In another embodiment of the present application, the light-emitting component includes a first LED and a second LED. The first LED is used for light rays of a first wavelength band, and the second LED is used for emitting light rays of a second wavelength band, and the first wavelength band is different from the second wavelength band.

[0124] Taking the light-emitting component emitting ultraviolet light as an example, ultraviolet light includes long-wave ultraviolet (UVA), medium-wave ultraviolet (UVB) and short-wave ultraviolet (UVC). The wavelength range of UVA is 315nm - 400nm, the wavelength range of UVB is 280nm - 315nm, and the wavelength range of UVC is 100nm - 280nm. The first LED and the second LED emit ultraviolet light of different wavelength bands. For example, the central wavelength of the light emitted by the first LED is 385nm, belonging to long-wave ultraviolet; the central wavelength of the light emitted by the second LED is 205nm, belonging to short-wave ultraviolet, and the two are combined to achieve mixed light and improve the printing effect.

[0125] For the optical system provided by the present application, the light-emitting component includes a first LED and a second LED, and the light rays emitted by the first LED and the second LED have different wavelength bands, which can adapt to the printing requirements of multiple wavelength bands and print more efficiently and accurately.

[0126] Referring to FIG. 12, an optical module provided by the present application is introduced. This optical module is used to implement the functions of the above optical system. Referring to FIG. 12, it includes a mounting plate 1201, a collimating lens array 1203, a grating or a light-shielding element 1202, and a controller. The light-shielding element 1202 is located between the mounting plate 1201 and the collimating lens array 1203. The mounting plate 1201 includes a plurality of light-emitting components, and each light-emitting component can emit light. The light-shielding element 1202 has a plurality of channels, and the plurality of channels are arranged in one-to-one correspondence with the plurality of light-emitting components. The plurality of collimating components 1102 in the collimating lens array 1203 are arranged in one-to-one correspondence with the plurality of light-emitting components, and the controller is electrically connected to the plurality of light-emitting components and can independently control the on / off of each light-emitting component.

[0127] The light emitted by the light-emitting component is collimated by the collimating lens array 1203 after passing through the channel. The central axis of the light-emitting component is coaxial with the central axis of the channel. Part of the light emitted by the light-emitting component is projected onto the collimating lens array 1203 from the channel, and the other light is blocked, making the boundary of the light source projected onto the collimating lens array 1203 clearer. Moreover, by setting the light-shielding element 1202, the area of the light spot projected onto the collimating lens array 1203 can be adjusted, so that the area of the overlapping region between adjacent two light spots is controllable, which helps to adjust the light intensity of the overlapping region. Optionally, the cross-section of the channel is rectangular, and the light-emitting center of the light-emitting component is located at the center of the rectangle. With the help of the channel, a rectangular light-emitting surface can be obtained. Alternatively, referring to Figure 13 , a plurality of channels 1301 are provided on the light-shielding element 1302. The cross-section of the channel 1301 is a regular hexagon, and the light-emitting center of the light-emitting component is located at the center of the regular hexagon. With the help of the channel 1301, a regular hexagon light-emitting surface can be obtained. In addition, the cross-section of the channel can also be triangular, regular octagonal, etc. In this regard, the embodiments of the present application do not make specific limitations.

[0128] In the optical module provided by this embodiment, a light-shielding element 1202 is provided between the mounting plate 1201 and the collimating lens array 1203. The collimating lens array 1203 is supported by the light-shielding element 1202, and crosstalk between the light-emitting components is prevented by a plurality of channels arranged in one-to-one correspondence with the plurality of light-emitting components, making the boundary of the light source clearer and making the area of the overlapping region of the light spots passing through the collimating components controllable, which helps to improve the exposure quality.

[0129] Referring to Figure 12A 、 12B, 12C and 12D, the compound eye lens array 1204 is arranged on the side of the collimating lens array 1203 away from the shading element 1202. The heat sink 1205 is arranged on the side of the light-emitting component away from the collimating lens array 1203, and is used to cool the light-emitting component. Specifically, the heat sink 1205 includes a plate body and heat dissipation fins arranged on one side of the plate body. The side of the plate body away from the heat dissipation fins is fitted with the mounting plate 1201. A heat dissipation gap is formed between adjacent heat dissipation fins, and the contact area between the heat sink 1205 and the air is increased by setting the heat dissipation fins, thereby improving the heat dissipation efficiency. Optionally, the plate body and the heat dissipation fins are an integrated structure and are made of a material with good thermal conductivity to accelerate the discharge of heat and avoid heat accumulation affecting the service life of the optical component.

[0130] See also Figure 12E , an adapter board 1206 is installed beside the mounting board 1201, and the adapter board 1206 is electrically connected to the mounting board 1201 to provide power to each light-emitting component. A circuit is arranged on the adapter board 1206. Figure 12A , 12B 12C, the adapter plate 1206 is parallel to the stacking direction of the mounting plate 1201, the shading element 1202, the collimating lens array 1203 and the fly-eye lens array 1204, and is arranged beside the mounting plate 1201. The adapter plate 1206 is connected to an external power supply device to supply power to each light-emitting component. The controller is electrically connected to the adapter plate 1206, and controls each light-emitting component through the circuit arrangement on the adapter plate 1206.

[0131] Figure 14 A photocuring 3D printing device according to some embodiments is shown. The photocuring 3D printing device (or additive manufacturing system) includes a driving assembly 1410 and a molding platform 1420. The physical layer is cured layer by layer on the molding platform 1420 to form a printed object, and the driving assembly 1410 can drive the molding platform 1420 to move in a vertical direction based on the instruction of a controller (not shown). The photocuring 3D printing device also includes a carrying device 1430, which is in the form of a trough, a box, a container or a plate, and can carry or carry photosensitive materials of different viscosities. When the carrying device 1430 is, for example, a container, the carrying device 1430 includes an elastic and at least partially transparent film 1432. When the molding platform 1420 moves close to the film and stays at a predetermined position, light is provided to cure the photosensitive material to form a current cured layer, which is simultaneously adhered to the molding platform 1420 and the film 1432. In order to continue to form the next cured layer, the molding platform 1420 and the current cured layer adhered thereto move away from the film 1432 to release the adhesion between the current cured layer and the film. After the molding platform 1420 (and the current solidified layer) is peeled off from the film 1432, the molding platform 1420 moves closer to the film to prepare for forming the next solidified layer. The light-curing 3D printing device also includes an optical system for providing uniform optical radiation in a predetermined area of the film.Figure 14 The optical system shown includes an LCD screen 1440 and an optical module 1450. The optical module 1450 is, for example, the optical module described above, which can independently control the opening and closing of each light-emitting component and can also adjust the light intensity of each light-emitting component (for example, by adjusting the drive current or PWM). The LCD screen 1440 is configured to selectively allow light to pass through. Alternatively, the optical system of some light-curing 3D printing devices includes a DMD component.

[0132] Figure 15 A light-curing 3D printing device according to still other embodiments is shown. The light-curing 3D printing device (or additive manufacturing system) includes a drive component 1510 and a forming platform 1520. Solid layers are cured layer by layer on the forming platform 1520 to form a printed object, and the drive component 1510 can drive the forming platform 1520 to move in the vertical direction based on the instructions of a controller (not shown). The light-curing 3D printing device further includes a carrying device 1530, which is in the form of, for example, a tank, a box, or a container and can carry or hold photosensitive materials of different viscosities. The carrying device 1530 contains a liquid material, and the forming platform 1520 is immersed in the liquid material. When the forming platform 1520 moves close to the liquid surface 1532 of the liquid material and stays at a predetermined position, light is provided to cure the photosensitive material to form the current cured layer, which adheres to the forming platform 1520. To continue forming the next cured layer, the forming platform 1520 moves away from the liquid surface 1532. Thereafter, wait for the liquid surface to level naturally or use a squeegee (not shown) to level the liquid surface 1532, so as to ensure a flat surface for the next cured layer. The light-curing 3D printing device further includes an optical system for providing uniform optical radiation in a predetermined area of the film. Figure 15 The optical system shown includes an LCD screen 1540 and an optical module 1550. The optical module 1550 is, for example, the optical module described above, which can independently control the opening and closing of each light-emitting component and can also adjust the light intensity of each light-emitting component (for example, by adjusting the drive current or PWM). The LCD screen 1540 is configured to selectively allow light to pass through. Alternatively, the optical system of some light-curing 3D printing devices includes a DMD component.

[0133] This application also provides a light-curing 3D printing device, including a material tray and an optical system, wherein the optical system is the optical system of any of the above-described embodiments. The material tray is used to carry the printing material. The light emitted by the optical system cures the printing material.

[0134] The printing material is a photosensitive resin material. The light-curing 3D printing device includes the optical system, the material tray, and the forming platform as described above. Among them, the optical system may include the optical module as described above. The forming platform is connected to a lifting mechanism, and under the action of the lifting mechanism, the forming platform can approach or move away from the material tray.

[0135] As shown Figure 16 in the figure, a circuit schematic diagram of the optical system of the light-curing 3D printer provided by the embodiment of the present application is exemplarily shown. The optical system 1600 includes a plurality of light-emitting components 1601, and each light-emitting component 1601 includes an LED. The controller 1602 of the optical system 1600 includes a plurality of channels CH1, CH2, …, CHm1, and each channel is used to provide a driving current, and the controller 1602 can independently control each light-emitting component 1601. In Figure 16 it, each LED is electrically connected to at least two (such as 2, 3, 4 or more) channels and is connected to the first driving voltage V1.

[0136] The total number A1 of the light-emitting components 1601 depends, for example, on the forming size of the light-curing 3D printer and the area of the illumination partition of a single light-emitting component 1601. A1 is, for example, any number from 100 to 15000, such as 100, 170, 200 or 15000.

[0137] In some embodiments, n channels are set for the light-emitting component 1601, where n≥2. The number of channels for different light-emitting components may be different. For example, 3 channels are set for the first light-emitting component and 5 channels are set for the second light-emitting component.

[0138] In some embodiments, the channels set for the light-emitting component 1601 are redundant. For example, 6 channels are set for the light-emitting component. During normal operation, only 4 channels are used, and the remaining 2 channels are spare. When any normal channel fails, the LED electrically connected to the failed channel can be connected to the spare channel.

[0139] In some embodiments, the maximum number of channels to which a single light-emitting component or a single LED is electrically connected is B1, the driving current of each channel is I, and the maximum power of a single light-emitting component or a single LED is P, and P = U1×(I×B1).

[0140] During actual use, a single LED is electrically connected to a part of the channels, for example, n channels (n < B1) are connected. At this time, the power of the LED is P = U1×(I×n).

[0141] Figure 16 In the corresponding embodiment, by configuring each LED to be electrically connected to at least two channels of the controller 1602, the driving current required for independent control of a single UV LED can be provided by combining the driving currents of at least two channels, meeting the desired radiation power of the UV LED.

[0142] For example, the drive current allowed for a single channel of a commercially available UV LED's single drive chip is 40 mA to 80 mA. After passing through, for example, Figure 14 the circuit arrangement, the drive current flowing through a single UV LED can be 160 mA to 400 mA. By increasing the drive current flowing through a single UV LED, the luminous power of the UV LED is increased.

[0143] As Figure 17 shown, a circuit schematic diagram of the optical system of the light-curing 3D printer provided by an embodiment of the present application is exemplarily shown. The optical system 1700 includes a plurality of light-emitting components 1701, and each light-emitting component 1701 includes a plurality of LEDs. The controller 1702 of the optical system 1700 includes a plurality of channels CH1, CH2, …, CHm2, each channel is used to provide a path of drive current, and the controller 1702 is used to independently control each light-emitting component 1701.

[0144] In Figure 17 each LED is electrically connected to at least two (such as 2, 3, 4 or more) channels and is connected to the first drive voltage V1.

[0145] The total number A2 of the light-emitting components 1701 depends, for example, on the forming size of the light-curing 3D printer and the area of the lighting partition of a single light-emitting component 1701. A2 is, for example, any number from 100 to 15000, such as 100, 170, 200 or 15000.

[0146] In some embodiments, n channels are set for the light-emitting component 1701, where n≥2. The number of channels for different light-emitting components may be different. For example, 3 channels are set for each LED in the first light-emitting component, and 5 channels are set for each LED in the second light-emitting component.

[0147] In some embodiments, the channels set for the light-emitting component 1701 are redundant. For example, 6 channels are set for each LED in the light-emitting component. During normal operation, each LED in the light-emitting component only uses 4 channels, and the remaining 2 channels are spare. When any normal channel fails, the LED connected to the failed channel can be connected to the spare channel.

[0148] In some embodiments, the maximum number of channels to which a single LED is electrically connected is B2, the drive current of each channel is I, and the maximum power of a single LED is P, P = U2×(I×B2).

[0149] During actual use, a single LED is electrically connected to a part of the channels, for example, connected to n channels (n < B2). At this time, the power of the LED is P = U2×(I×n).

[0150] In some embodiments, the number of LEDs included in different light-emitting components may be the same or different, and can be configured according to actual needs. For example, 2 LEDs are configured for the first light-emitting component, and 3 LEDs are configured for the second light-emitting component.

[0151] In some embodiments, the maximum number of channels to which different LEDs are electrically connected may be the same or different, and can be configured according to actual needs. For example, the maximum number of channels to which the first LED is electrically connected is B21, and the maximum number of channels to which the second LED is electrically connected is B22. Figure 17 In the corresponding embodiment, by configuring each LED to be electrically connected to at least two channels of the controller 1702, the driving currents of at least two channels can be combined to provide the relatively high driving current required for independently controlling a single UV LED, meeting the desired radiation power of the UV LED.

[0152] For example, the driving current allowed by a single channel of a commercially available single driving chip for a UV LED is 40 mA to 80 mA. After, for example, Figure 15 such a circuit arrangement, the driving current flowing through a single UV LED can be 160 mA to 400 mA. By increasing the driving current flowing through a single UV LED, the luminous power of the UV LED is increased.

[0153] As Figure 18 shown, a circuit schematic diagram of the optical system of the light-curing 3D printer provided by the embodiment of the present application is exemplarily shown. The optical system 1800 includes a plurality of light-emitting components 1801, and each light-emitting component 1801 includes an LED. The controller 1802 of the optical system 1800 includes a plurality of channels CH1, CH2,..., CHm3, and each channel is used to provide a driving current path. The controller 1802 is used to independently control each light-emitting component 1801.

[0154] In Figure 18 , each LED is electrically connected to a current amplification circuit 1803, and each current amplification circuit 1803 is electrically connected to a channel and is connected to the second driving voltage V2.

[0155] The total number A3 of the light-emitting components 1801 depends, for example, on the forming size of the light-curing 3D printer. The area of the illumination partition of a single light-emitting component 1601 is any number among, for example, 100 to 15000, such as 100, 170, 200, or 15000.

[0156] In some embodiments, n current amplifying circuits 1803 are provided for the light emitting component 1801, where n≥1. The number of current amplifying circuits for different light emitting components may be different. For example, one current amplifying circuit 1803 is provided for the first light emitting component, and two current amplifying circuits 1803 are provided for the second light emitting component.

[0157] In some embodiments, the channels set for the current amplifier circuit 1803 are redundant. For example, two channels are set for the current amplifier circuit. During normal operation, only one channel is used, and the remaining one channel is a spare channel. When any normal channel fails, the current amplifier circuit electrically connected to the failed channel can be connected to the spare channel. In some embodiments, the maximum current amplification factor of the current amplifier circuit 1803 is E3, and the driving current of each channel is I, then the maximum power of a single LED is P, P = U2 × (I × E3).

[0158] In actual use, the current amplification factor of the current amplifier circuit 1803 can be adjusted. For example, the current amplification factor is E31 (E31<E3). At this time, the power of the LED is P=U2×(I×E31).

[0159] In some embodiments, the maximum current amplification factors of the current amplification circuits electrically connected to different LEDs may be the same or different and may be configured according to actual needs. For example, the maximum current amplification factor of the current amplification circuit electrically connected to the first LED is E32, and the maximum current amplification factor of the current amplification circuit electrically connected to the second LED is E33. Figure 18 In the corresponding embodiment, by electrically connecting each LED to at least one current amplifying circuit 1803, and by electrically connecting each current amplifying circuit to at least one channel, the driving current can be amplified by the current amplifying circuit to provide a higher driving current required for independent control of a single UV LED, thereby meeting the desired radiation power of the UV LED.

[0160] For example, a single channel of a commercially available UV LED driver chip allows a driving current of 40 mA to 80 mA. Figure 18 The circuit arrangement can be such that the driving current flowing through a single UV LED can be 160 mA to 400 mA. The driving current flowing through a single UV LED is amplified by the current amplification circuit, and the luminous power of the UV LED is increased.

[0161] like Figure 19As shown, a circuit schematic diagram of the optical system of the light-curing 3D printer provided by the embodiments of the present application is exemplarily shown. The optical system 1900 includes a plurality of light-emitting components 1901, and each light-emitting component 1901 includes a plurality of LEDs. The controller 1902 of the optical system 1900, the controller 1902 includes a plurality of channels CH1, CH2, …, CHm4, each channel is used to provide a driving current, and the controller 1902 is used to independently control each light-emitting component 1901.

[0162] In Figure 19 , each LED is electrically connected to a current amplification circuit 1903, and each current amplification circuit 1903 is electrically connected to a channel and accesses the second driving voltage V2.

[0163] The total number A4 of the light-emitting components 1901 depends, for example, on the forming size of the light-curing 3D printer. The area of the lighting partition of a single light-emitting component 1901 is any number among 100 to 15000, for example, 100, 170, 200, or 15000.

[0164] In some embodiments, n current amplification circuits are set for the light-emitting component, where n≥1. The number of current amplification circuits for different light-emitting components may be different. For example, 2 current amplification circuits are set for the first light-emitting component, and 3 current amplification circuits are set for the second light-emitting component.

[0165] In some embodiments, the channels set for the current amplification circuit 1903 are redundant. For example, 3 channels are set for the current amplification circuit. During normal operation, only 1 channel is used, and the remaining 2 channels are standby. When any normal channel fails, the current amplification circuit connected to the faulty channel can be connected to the standby channel.

[0166] In some embodiments, the maximum current amplification multiple of each current amplification circuit 1903 is E4, the driving current of each channel is I, and the maximum power of a single LED is P, P = U2×(I×E4).

[0167] During actual use, the current amplification multiple of the current amplification circuit 1903 can be adjusted. For example, the current amplification multiple is E41 (E41 < E4), and at this time, the power of the LED is P = U2×(I×E41).

[0168] In some embodiments, the maximum current amplification factors of the current amplification circuits to which different LEDs are electrically connected may be the same or different, and can be configured according to actual needs. For example, the maximum current amplification factor of the current amplification circuit to which the first LED is electrically connected is E42, the maximum current amplification factor of the current amplification circuit to which the second LED is electrically connected is E43, and the maximum current amplification factor of the current amplification circuit to which the third LED is electrically connected is E44.

[0169] Figure 19 In the corresponding embodiments, by electrically connecting each LED to a current amplification circuit 1903 and electrically connecting each current amplification circuit to a channel, the driving current can be amplified by the current amplification circuit to provide the relatively high driving current required for independently controlling a single UV LED, meeting the desired radiation power of the UV LED.

[0170] For example, the driving current allowed for a single channel of a single driving chip of a commercially available UV LED is 40 mA to 80 mA. After, for example, Figure 19 such a circuit arrangement, the driving current flowing through a single UV LED can be 160 mA to 400 mA. By amplifying the driving current flowing through a single UV LED by the current amplification circuit, the luminous power of the UV LED is increased.

[0171] In applications, the magnitude U1 of the first driving voltage V1 and the magnitude U2 of the second driving voltage V2 may be the same or different, and can be configured according to actual needs. For example, U1 = U2 = 4V.

[0172] As Figure 20 shown, a circuit schematic diagram of the optical system of the light-curing 3D printer provided by the embodiments of the present application is exemplarily shown. The optical system 2000 includes a plurality of light-emitting components 2001, and each light-emitting component 2001 includes an LED. The controller 2002 of the optical system 2000 includes a plurality of channels CH1, CH2,..., CHm5, and each channel is used to provide a path of driving current, and the controller 2002 can independently control each light-emitting component 2001.

[0173] In Figure 20 , each LED includes a plurality of diced sub-LED wafers 20011, 20012, 20013, the plurality of sub-LED wafers are connected in series, and are electrically connected to a channel of the controller 2002 and connected to the third driving voltage V3.

[0174] The total number A5 of the light-emitting components 2001 depends, for example, on the forming size of the light-curing 3D printer and the area of the lighting partition of a single light-emitting component 1801. A5 is, for example, any number among 100 to 15000, such as 100, 170, 200, or 15000.

[0175] In some embodiments, n channels are provided for the light-emitting component 2001, where n≥2. The number of channels for different light-emitting components may be different. For example, 3 channels are provided for the first light-emitting component, and 5 channels are provided for the second light-emitting component.

[0176] In some embodiments, the channels provided for the light-emitting component 2001 are redundant. For example, 6 channels are provided for the light-emitting component. During normal operation, only 4 channels are used, and the remaining 2 channels are spare. When any normal channel fails, the LED electrically connected to the failed channel can be connected to the spare channel.

[0177] In some embodiments, the maximum number of channels electrically connected to a single light-emitting component or a single LED is B1, and the driving current of each channel is I. Then the maximum power of a single light-emitting component or a single LED is P, and P = U3×(I×B1).

[0178] During actual use, a single LED is electrically connected to a part of the channels, for example, n channels (n < B1). At this time, the power of the LED is P = U3×(I×n).

[0179] Figure 20 In the corresponding embodiment, by making each LED include a plurality of diced sub-LED wafers connected in series, while the luminous power of a single LED remains unchanged, the driving current required for a single LED is reduced, and the driving voltage required for a single LED is increased. By making the plurality of serially connected sub-LED wafers electrically connected to at least one channel of the controller and connected to a higher driving voltage (i.e., the third driving voltage V3), without increasing the driving current of a single channel, the required driving current can be provided when independently controlling a single UV LED and the higher driving voltage required for the plurality of serially connected sub-LED wafers can be satisfied, meeting the desired radiation power of the UV LED.

[0180] For example, the driving current allowed for a single channel of a commercially available single driving chip of a UV LED is 40 mA to 80 mA, and the driving voltage of a single UV LED is 4V. After, for example Figure 20 such a circuit arrangement, the driving current allowed for a single channel of a single driving chip can remain unchanged. By increasing the driving voltage of a single UV LED, the luminous power of the UV LED is increased.

[0181] Such as Figure 21As shown, a circuit schematic diagram of the optical system of the light-curing 3D printer provided by the embodiment of the present application is exemplarily shown. The optical system 2100 includes a plurality of light-emitting components 2101, and each light-emitting component 2101 includes a plurality of LEDs. The controller 2102 includes a plurality of channels CH1, CH2, …, CHm6, and each channel is used to provide a driving current, and the controller 2102 can independently control each light-emitting component 2101.

[0182] In Figure 21 , each LED includes a plurality of sub-LED wafers that are cut, the plurality of sub-LED wafers are connected in series, and are electrically connected to one channel of the controller 2102 and access the third driving voltage V3.

[0183] The total number A6 of the light-emitting components 2101 depends, for example, on the forming size of the light-curing 3D printer and the area of the lighting partition of a single light-emitting component 2101. A6 is, for example, any number from 100 to 15000, such as 100, 170, 200 or 15000.

[0184] In some embodiments, n channels are set for the light-emitting component 2101, where n≥2. The number of channels for different light-emitting components may be different. For example, 3 channels are set for the first light-emitting component and 5 channels are set for the second light-emitting component.

[0185] In some embodiments, the channels set for the light-emitting component 2101 are redundant. For example, 6 channels are set for the light-emitting component. During normal operation, only 4 channels are used, and the remaining 2 channels are spare. When any normal channel fails, the LEDs electrically connected to the failed channel can be connected to the spare channel.

[0186] In some embodiments, the maximum number of channels to which a single light-emitting component or a single LED is electrically connected is B2, the driving current of each channel is I, and the maximum power of a single light-emitting component or a single LED is P, P = U3×(I×B2).

[0187] During actual use, a single LED is electrically connected to a part of the channels, for example, n channels (n < B2), and at this time the power of the LED is P = U3×(I×n).

[0188] In some embodiments, the number of LEDs included in different light-emitting components may be the same or different, and can be configured according to actual needs. For example, 2 LEDs are configured for the first light-emitting component and 3 LEDs are configured for the second light-emitting component.

[0189] In some embodiments, the maximum number of channels to which different LEDs are electrically connected may be the same or different, and can be configured according to actual needs. For example, the maximum number of channels to which the first LED is electrically connected is B21, and the maximum number of channels to which the second LED is electrically connected is B22.

[0190] Figure 21 In the corresponding embodiments, by making each LED include a plurality of diced sub-LED wafers connected in series, while the luminous power of a single LED remains unchanged, the drive current required for a single LED is reduced and the drive voltage required for a single LED is increased. By making the plurality of serially connected sub-LED wafers electrically connected to at least one channel of the controller and connected to a high drive voltage (i.e., the third drive voltage V3), without increasing the drive current of a single channel, the required drive current can be provided when independently controlling a single UV LED and the relatively high drive voltage required for the plurality of serially connected sub-LED wafers can be satisfied, meeting the desired radiation power of the UV LED. For example, the drive current allowed for a single channel of a commercially available single drive chip for a UVLED is 40 mA to 80 mA, and the drive voltage of a single UV LED is 4V. After, for example Figure 21 such a circuit arrangement, the drive current allowed for a single channel of a single drive chip can remain unchanged. By increasing the drive voltage of a single UV LED, the luminous power of the UVLED is increased.

[0191] In some embodiments, the magnitude U3 of the third drive voltage V3 is greater than the magnitude U1 of the first drive voltage V1 and the magnitude U2 of the second drive voltage V2, i.e., U3 > U1 and U3 > U2. When the requirement for the maximum luminous power P of a single LED remains unchanged and the maximum drive current I that each channel of the controller can provide remains unchanged, U3 = U1 × B2 = U2 × E4. Considering that there may be power losses for the plurality of serially connected sub-LED wafers relative to an undiced single LED, U3 can be set to be greater than U1 × B2, where U1 × B2 = U2 × E4. In some embodiments, in the same optical system, each LED can adopt any one of the above configurations, and different LEDs can adopt different configurations, i.e., multiple different configurations can coexist in the same optical system, and can be selected according to actual requirements such as cost, process complexity, volume, etc., with high configuration flexibility.

[0192] In the above embodiments, the maximum luminous power P of the LED and the maximum drive current I that each channel of the controller can provide are respectively the inherent operating performance parameters of the LED and the controller, which are determined by the types and performances of the LED and the controller selected by the user.

[0193] In some embodiments, each light emitting assembly includes a plurality of LEDs emitting ultraviolet light, the plurality of LEDs emitting ultraviolet light include a first LED and a second LED, wherein the light emission band of the first LED is different from the light emission band of the second LED. Alternatively, each light emitting assembly includes a plurality of LEDs emitting ultraviolet light, the plurality of LEDs emitting ultraviolet light include a first LED and a second LED, wherein the light emission band of the first LED is the same as the light emission band of the second LED.

[0194] In an embodiment of the present application, by configuring multiple LEDs with different light-emitting wavelengths in the lighting zone defined by the same light-emitting component, the optical system can time-share project or simultaneously project patterns of multiple bands onto the printed material, which can meet the printing requirements of different materials or different processes, and the light-emitting wavelength of the optical system can be switched without replacing the light-emitting panel.

[0195] In some embodiments, the plurality of LEDs emitting light of the same wavelength include a main LED and at least one corresponding backup LED.

[0196] In some embodiments, multiple LEDs with the same light-emitting wavelength are configured in a lighting zone defined by the same light-emitting component, one of the LEDs is used as a main LED, and the remaining LEDs are used as corresponding backup LEDs. When the main LED or some of the backup LEDs are detected as bad pixels, the remaining backup LEDs can be lit to ensure the continuity of lighting.

[0197] In application, any light emitting assembly may include a main LED and a corresponding at least one spare LED having the same light emitting wavelength. The light emitting wavelengths of the main LED and the corresponding at least one spare LED may be in the ultraviolet band or the blue light band. The ultraviolet band and the blue light band may be set according to actual needs, for example, the central wavelength of the ultraviolet band may be 405nm or 385nm.

[0198] like Figure 22 , which exemplarily shows a structural schematic diagram of a current amplifier circuit provided in an embodiment of the present application, wherein the current amplifier circuit 2200 includes a first resistor unit 2201, a second resistor unit 2202 and a transistor unit 2203;

[0199] A first end of the first resistor unit 2201 is electrically connected to an input end of the transistor unit 2203 and connected to a second driving voltage V2, and a second end of the first resistor unit 2201 is electrically connected to a first end of the second resistor unit 2202 and connected to a driving current Iset;

[0200] The second end of the second resistor unit 2202 is electrically connected to the controlled end of the transistor unit 2203;

[0201] The output terminal of the transistor unit 2203 is electrically connected to an LED.

[0202] In an application, both the first resistor unit 2201 and the second resistor unit 2202 can be implemented by one resistor or multiple resistors connected in series. The transistor unit 2203 can be implemented by a bipolar junction transistor (BJT) or a field-effect transistor (FET). Among them, the BJT transistor can be a PNP transistor or an NPN transistor, and the FET transistor can be an N-channel junction field-effect transistor (JFET), a P-channel JFET, an N-channel metal-oxide-semiconductor field-effect transistor (MOSFET), a P-channel MOSFET, an enhancement-mode MOSFET, or a depletion-mode MOSFET.

[0203] As Figure 23 shown, an exemplary second structural schematic diagram of the current amplification circuit provided by an embodiment of the present application is shown. Among them, the first resistor unit 2301 includes a first resistor R1, the second resistor unit 2302 includes a second resistor R2, and the transistor unit 2303 includes a PNP transistor Q1. The emitter, base, and collector of the PNP transistor Q1 respectively constitute the input terminal, controlled terminal, and output terminal of the transistor unit 2303.

[0204] As Figure 24 shown, an exemplary structural schematic diagram of a power supply circuit in an optical system provided by an embodiment of the present application is shown. Among them, the power supply circuit 2400 includes multiple buck circuits 2401, 2402, 2403, such as DC-DC (direct current to direct current) buck circuits. The multiple DC-DC buck circuits 2401, 2402, 2403 are respectively used to convert the input power supply voltage Vin into drive voltages Vout1, Vout2,..., Vout3.

[0205] In an application, since all the LEDs in the optical system are essentially in parallel and the required total current is relatively high, if only one or a few DC-DC buck circuits are used to provide the drive voltage, it is easy for the line to overheat due to the excessive current that a single DC-DC buck circuit needs to bear. Therefore, multiple DC-DC buck circuits need to be set up to share the large current to achieve overcurrent protection and overheat protection. In addition, since the DC-DC buck circuit also has a bucking function, it can achieve overvoltage protection. The total number of DC-DC buck circuits can be set according to the current-carrying capacity of the DC-DC buck circuit, and is at least two, that is, n≥2.

[0206] In applications, each DC-DC buck circuit can be implemented by a DC-DC buck chip. Different DC-DC buck circuits can use the same or different types of DC-DC buck chips.

[0207] In applications, the magnitude of the power supply voltage Vin can be configured as any voltage greater than the driving voltages required by the LEDs in the optical system according to actual needs. For example, the magnitude of the power supply voltage Vin can be 24V.

[0208] In applications, according to the configuration methods adopted by the LEDs in the optical system, the driving voltages Vout1, Vout2, and Vout3 output by the multiple buck circuits 2401, 2402, and 2403 can include at least one of the first driving voltage V1, the second driving voltage V2, and the third driving voltage V3. For example, in the case of adopting the configuration method in the optical system 1600 or 1700, Vout1 = Vout2 = Vout3 = V1. For example, in the case of adopting the configuration method in the optical system 1800 or 1900, Vout1 = Vout2 = Vout3 = V2. For example, in the case of adopting the configuration method in the optical system 2000 or 2100, Vout1 = Vout2 = Vout3 = V3.

[0209] As Figure 25 shown, a schematic structural diagram of the buck circuit provided by an embodiment of the present application is exemplarily shown. The buck circuit 2500 includes a buck circuit 2501 (such as a DC-DC buck circuit) and a voltage regulating circuit 2502;

[0210] The buck circuit part is composed of an input capacitor, a power supply controller chip 2503, a high-side switch tube, a low-side switch tube, an inductor, and an output capacitor, and is connected in the structure of a Buck buck topology;

[0211] The input end of the input capacitor and the input end VIN of the power supply controller chip 2503 are connected to the power supply voltage Vin, and the output end of the input capacitor is grounded;

[0212] The high-side pin HO of the power supply controller chip 2503 is electrically connected to the controlled end of the high-side switch tube. The voltage output pin LX of the power supply controller chip 2503 is electrically connected to the output end of the high-side switch tube, one end of the inductor, and the input end of the low-side switch tube. The low-side pin LO of the power supply controller chip 2503 is electrically connected to the controlled end of the low-side switch tube. The feedback pin FB of the DC-DC power supply controller chip 2503 is electrically connected to the second end of the resistor R2 and the first end of the resistor R4. The ground pin GND of the power supply controller chip 2503 is grounded;

[0213] The input end of the high-side switch tube is connected to the power supply voltage Vin;

[0214] The output terminal of the low-voltage side switching tube is grounded;

[0215] The second end of the inductor is electrically connected to the input end of the output capacitor and the first end of the resistor R1 to provide the driving voltage Vout;

[0216] The output terminal of the output capacitor is grounded;

[0217] The second end of the resistor R1, the first end of the resistor R2 and the first end of the resistor R4 are electrically connected, and the second end of the resistor R3 is grounded;

[0218] The voltage regulating circuit 2502 is composed of a PWM / DAC voltage regulating unit 2504 and a processor 2505;

[0219] The input end of the PWM / DAC voltage regulating unit 2504 is electrically connected to the processor 2505, and the output end Vset of the PWM / DAC voltage regulating unit 2504 is electrically connected to the second end of the resistor R4.

[0220] Since the voltage at the feedback pin FB of the DC-DC power controller chip 2503 remains basically unchanged, generally 0.6V or 0.8V, etc., depending on the internal voltage reference, and Vout and Vfb generally have a fixed multiple relationship through the voltage division relationship of two resistors in series, the output Vout is constant. Calculate the adjustable range of Vout based on the LED voltage parameter information, and determine the values of R1, R2, R3 and R4 according to the voltage change range of the introduced DAC / PWM voltage regulating unit 2304, so as to dynamically adjust the multiple relationship between Vout and Vfb, and finally adjust the magnitude of Vout.

[0221] In the application, the buck circuit 2500 is any one of multiple buck circuits 2501, 2102, 2203, that is, Vout is equal to any one of Vout1, Vout2, Vout5.

[0222] In the embodiment of the present application, by using multiple DC-DC buck circuits to convert a larger power supply voltage into a smaller driving voltage required for each LED in the optical system, the functions of overheat protection, overcurrent protection and overvoltage protection can be realized while providing the driving voltage.

[0223] Such as Figure 26 As shown, an exemplary circuit schematic diagram of the optical system of the light-curing 3D printer provided by the embodiment of the present application is shown, where the optical system 2600 includes a processor 2603 electrically connected to a controller 2601 and a power supply circuit 2602;

[0224] A controller 2601 is configured to control the drive current Iset of each channel according to instructions given by a processor 2603. When the drive voltage Vout associated with any channel is lower than a corresponding first preset voltage, it indicates that the drive current Iset of this channel is too large at this time and the drive voltage Vout output by the power supply circuit 2602 is too low, and a corresponding low-voltage warning signal needs to be output to the processor 2603. When the drive voltage Vout associated with any channel is higher than a corresponding second preset voltage, it indicates that the drive current Iset of this channel is too small at this time and the drive voltage Vout output by the power supply circuit 2602 is too high, and a corresponding high-voltage warning signal needs to be output to the processor 2603;

[0225] A processor 2603 is configured to control the pulse-width modulation (PWM) voltage regulation signal or digital-to-analog converter (DAC) voltage regulation signal output to the power supply circuit 2602 according to each low-voltage warning signal, so as to increase the drive voltage Vout output by the power supply circuit 2602, and control the PWM voltage regulation signal or DAC voltage regulation signal output to the power supply circuit 2602 according to each high-voltage warning signal, so as to reduce the drive voltage Vout output by the power supply circuit 2602.

[0226] In an application, the controller 2601 can be Figures 16 - 21 any one of the controllers in Figure 26 FIG. shows the drive current Iset of any one channel in the controller 2601 and the drive voltage Vout output by the power supply circuit 2602. Vout can be any one of Vout1, Vout2, and Vout3.

[0227] It should be understood that based on Figures 16 - 21 the configuration of each channel in any one of the controllers, each channel is not directly connected to the drive voltage Vout, but is connected to the drive voltage Vout through an LED, a current amplification circuit, or a plurality of sub-LED wafers connected in series; among them, the redundant channel has no signal input, and the drive current Iset of the redundant channel = 0A.

[0228] In an application, the drive voltage Vout that the power supply circuit 2602 needs to output can be calculated in advance according to the drive current Iset of each channel and the equivalent resistance values of each load (i.e., LED, current amplification circuit, a plurality of sub-LED wafers connected in series, loss resistance of wires, etc.) in the configuration of this channel, based on Ohm's law.

[0229] In an application, while keeping the magnitude of the driving voltage Vout unchanged, the processor 2603 can control the magnitude of the driving current Iset output by each channel of the controller 2601 through a software control method to adjust the light-emitting power of the corresponding LED. The software control method is implemented based on a computer program running in the processor 2603. The user can perform human-computer interaction with the processor 2603 through any human-computer interaction method to adjust the light-emitting power of each LED, and the processor 2603 can also automatically control the light-emitting power of each LED according to the printing requirements.

[0230] As Figure 27 shown, a circuit schematic diagram of the optical system of the light-curing 3D printer provided by an embodiment of the present application is exemplarily shown. The optical system 2700 includes a processor 2702 electrically connected to a controller 2701;

[0231] The controller 2701 is configured to determine whether each channel is short-circuited or open-circuited according to the driving current Iset of each channel, and output a corresponding short-circuit signal to the processor 2702 when any channel is short-circuited, and output a corresponding open-circuit signal to the processor 2702 when any channel is open-circuited;

[0232] The processor 2702 is configured to locate the LED electrically connected to the corresponding channel as a bad pixel according to the short-circuit signal or the open-circuit signal to implement bad pixel detection.

[0233] In an application, the controller 2701 can determine that a channel is short-circuited when the driving current Iset of any non-redundant channel > I + ΔI, and determine that a channel is open-circuited when the driving current Iset of any non-redundant channel = 0A, where ΔI is the maximum error allowed by the maximum driving current I that the channel can provide.

[0234] In an application, when receiving a short-circuit signal or an open-circuit signal, the processor 2702 can locate the position of the LED electrically connected to the corresponding channel and mark it as a bad pixel to implement bad pixel detection.

[0235] In one embodiment, the processor 2702 is further configured to enable a corresponding spare LED when any primary LED is located as a bad pixel;

[0236] When at least one spare LED includes multiple spare LEDs and some of the spare LEDs are located as bad pixels, enable one remaining spare LED.

[0237] In an application, when at least one light-emitting component includes multiple LEDs with the same emission wavelength, and these multiple LEDs with the same emission wavelength include a primary LED and at least one corresponding backup LED, the processor 2702 can, when any primary LED is positioned as a dead pixel, control the controller 2701 to provide a drive current Iset to a corresponding backup LED to enable (i.e., turn on) the corresponding backup LED; when at least one backup LED includes multiple backup LEDs, if the activated backup LED is also defined as a dead pixel, the processor 2702 controls the controller 2701 to provide a drive current Iset to the next backup LED to enable the next backup LED, and so on, until in the case where any primary LED and all its corresponding backup LEDs are detected as dead pixels, a corresponding dead pixel alarm signal can be sent through any human-machine interaction device connected by electricity to remind the user. The user can choose to replace the light-emitting panel or replace or repair the dead pixel.

[0238] As Figure 28 shown, a circuit schematic diagram of the optical system of the light-curing 3D printer provided by an embodiment of the present application is exemplarily shown. The optical system 2800 includes:

[0239] A light-emitting panel 2801, and multiple light-emitting components are arranged in an array on the light-emitting panel 2801;

[0240] A processor 2802, electrically connected to the controller 2603, and the processor 2802 is configured to:

[0241] In a direct current (DC) dimming mode, control the controller 2803 to output analog current signals of different magnitudes to each LED, obtain the light intensity of each LED under the analog current signals of different magnitudes based on the light intensity acquisition device 2804, and fit the power-current relationship between the power of the light-emitting panel 2801 and the magnitude of the analog current signal according to the analog current signals of different magnitudes and the light intensity of each LED under the analog current signals of different magnitudes;

[0242] In a PWM dimming mode, control the controller 2803 to output PWM signals with different duty cycles to each LED, and obtain the light intensity of each LED under the PWM signals with different duty cycles based on the light intensity acquisition device 2804;

[0243] According to the power-current relationship, the PWM signals with different duty cycles, and the light intensity of each LED under the PWM signals with different duty cycles, obtain the power of each LED under the PWM signals corresponding to different light intensities, so as to obtain the PWM value-power relationship between the power of each LED and the duty cycle of the PWM signal;

[0244] In the hybrid dimming mode, according to the target power and the PWM value-power relationship between the power of each LED and the duty cycle of the PWM signal, the controller 2803 is controlled to output the magnitude of the analog current signal to the light-emitting panel 2801 and the duty cycle of the PWM signal of each LED, so as to adjust the light intensity of the light-emitting panel 2801 and keep the light intensity of each LED consistent.

[0245] In applications, the light intensity acquisition device 2804 can be an image capture device (e.g., a camera or any device with a camera) or a contact probe (e.g., a photometer).

[0246] In applications, the processor 2802 can first draw the light intensity-current curve (i.e., the PI curve) of a single LED according to the analog current signals of different magnitudes and the light intensity of a single LED under the analog current signals of different magnitudes. For example, if the light-emitting panel 2801 includes A LEDs, then A PI curves need to be drawn; then, based on the fitting of the A PI curves, the power-current relationship between the power of the light-emitting panel 2801 and the magnitude of the analog current signal is obtained. The processor 2802 can also first draw the light intensity-current curves of multiple LEDs according to the analog current signals of different magnitudes and the light intensity of multiple LEDs under the analog current signals of different magnitudes. For example, if the light-emitting panel 2801 includes B groups of LEDs, and each group of LEDs includes multiple LEDs, then B PI curves need to be drawn; then, based on the fitting of the B PI curves, the power-current relationship between the power of the light-emitting panel 2801 and the magnitude of the analog current signal is obtained.

[0247] In applications, the processor 2802 can establish the corresponding relationship between the PWM signals of different duty cycles and the light intensity of each LED under the PWM signals of different duty cycles, and store this corresponding relationship in the memory. The corresponding relationship can specifically exist in the form of a corresponding relationship table. Based on this corresponding relationship, when the processor 2802 needs to adjust the light intensity of multiple LEDs to a consistent preset light intensity, it can determine the duty cycle of the PWM signal required for each LED under the preset light intensity according to the preset light intensity and the corresponding relationship, and drive each LED based on the duty cycle of the PWM signal required for each LED under the preset light intensity, so as to adjust the light intensity of multiple LEDs to be consistent and achieve the calibration of the light intensity difference between different LEDs.

[0248] In an application, the processor in each of the above embodiments may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0249] In an application, the memory may be an internal storage unit of the processor in some embodiments, for example, the memory. The memory may also be an external storage device electrically connected to the processor in other embodiments, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the memory may also include both an internal storage unit and an external storage device. The memory is used to store an operating system, application programs, a boot loader, data, and other programs, such as program codes of computer programs. The memory may also be used to temporarily store data that has been output or is to be output.

[0250] The optical system of the present application is applied to a light-curing 3D printing device or an additive manufacturing system. The light-curing 3D printing device includes a driving component and a forming platform. Solid layers are cured layer by layer on the forming platform to form a printed object, and the driving component can drive the forming platform to move in the vertical direction based on the instructions of a controller. The light-curing 3D printing device further includes a carrying device, which is in the form of, for example, a trough, a box, a container or a plate, and can carry or hold photosensitive materials with different viscosities. When the carrying device is a container, for example, the carrying device includes an elastic and at least partially transparent film. When the forming platform moves close to the film and stays at a predetermined position, light is provided to cure the photosensitive material to form the current cured layer, and the current cured layer adheres to both the forming platform and the film at the same time. To continue forming the next cured layer, the forming platform and the current cured layer adhered thereto move away from the film to release the adhesion between the current cured layer and the film. After the forming platform (and the current cured layer) is peeled off from the film, the forming platform moves close to the film to prepare for forming the next cured layer. The light-curing 3D printing device further includes an optical system for providing uniform optical radiation in a predetermined area of the film. An optical system includes an LCD screen and an optical module. The optical module can independently control the opening and closing of each light-emitting component, and can also adjust the light intensity of each light-emitting component (for example, by adjusting the driving current or PWM). The LCD screen is configured to selectively allow light to pass through. Alternatively, the optical system of some light-curing 3D printing devices includes a DMD component.

[0251] The optical system of the present application can also be applied to the light-curing 3D printing device of some other embodiments. The light-curing 3D printing device (or additive manufacturing system) includes a driving component and a forming platform. Solid layers are cured layer by layer on the forming platform to form a printed object, and the driving component can drive the forming platform to move in the vertical direction based on the instructions of a controller (not shown). The light-curing 3D printing device further includes a carrying device, which is in the form of, for example, a trough, a box or a container, and can carry or hold photosensitive materials with different viscosities. The carrying device contains a liquid material, and the forming platform is immersed in the liquid material. When the forming platform moves close to the liquid surface of the liquid material and stays at a predetermined position, light is provided to cure the photosensitive material to form the current cured layer, and the current cured layer adheres to the forming platform. To continue forming the next cured layer, the forming platform moves away from the liquid surface. Thereafter, wait for the liquid surface to level naturally or use a squeegee (not shown) to level the liquid surface to ensure a flat surface for the next cured layer. The light-curing 3D printing device further includes an optical system for providing uniform optical radiation in a predetermined area of the film. The optical system includes an LCD screen and an optical module. The optical module is, for example, the optical module described above, which can independently control the opening and closing of each light-emitting component, and can also adjust the light intensity of each light-emitting component (for example, by adjusting the driving current or PWM). The LCD screen is configured to selectively allow light to pass through. Alternatively, the optical system of some light-curing 3D printing devices includes a DMD component.

[0252] An optical system for a 3D printer according to some embodiments of the present application includes an optical module and an LCD screen. The optical module includes a plurality of light-emitting components, and each light-emitting component can be controlled to be independently turned on or off or to adjust the power. The light emitted by the light-emitting components reaches the LCD screen and selectively passes through the LCD screen due to the setting of the LCD screen.

[0253] The inventors have recognized that the light-emitting properties of each UV LED of the plurality of light-emitting components of the optical module are not exactly the same. For example, under the same driving voltage and driving current, the error of the light intensity or light power density of different 10 UV LEDs is, for example, 1% to 5%. In addition, there are also errors in the performance of the plurality of liquid crystals of the LCD screen under the same optical radiation.

[0254] At least to improve the uniformity of the radiation of the optical system, the present application provides some solutions. For example, the present application detects the light intensity distribution of the optical system on the LCD screen and performs compensation or adjustment to achieve uniform light intensity output of the optical system. In other embodiments, the present application separately detects the light intensity distribution of the optical system at the optical module and the LCD screen and separately performs compensation or adjustment to achieve uniform light intensity output of the optical system.

[0255] In some embodiments, the LCD screen is calibrated. Figure 29 The illustrated optical system includes a light source 2910 and an LCD screen 2930, and the light source 2910 projects light onto the LCD screen 2930. The light source 2910 is, for example, the optical module of the present application or other light sources that provide substantially uniform radiation.

[0256] It can be understood that if the light source 2910 provides uniform radiation, the intensity of the light passing through the LCD screen 2930 is uniform. In fact, the intensity of the light passing through the LCD screen 2930 is not uniform, for example, because one or more liquid crystals of the LCD screen 2930 are defective or damaged. An image acquisition device 2950 (such as a camera or a video camera) is used to capture a predetermined pattern, and then the gray values of multiple regions of the image are obtained. The gray value of each region can represent the light intensity of that region.

[0257] In some embodiments, the non-uniform gray levels of multiple regions of the image indicate that the light with uniform light intensity has non-uniform light intensity after passing through the current LCD screen. At this time, a mask can be applied to the LCD screen to adjust or compensate the light intensity of the light passing through one or more regions of the LCD screen.

[0258] A grayscale image of the screen can be obtained in a variety of ways.

[0259] In some embodiments, an image acquisition device is used to capture all regions of the screen.

[0260] In some embodiments, a partial area of the screen is photographed using an image acquisition device, and then the photographing is repeated at least once.

[0261] In some embodiments, some areas of the screen are photographed only once.

[0262] In some embodiments, some areas of the screen are photographed repeatedly at least twice.

[0263] Figure 30 An LCD screen divided into multiple areas is shown. In Figure 30 the illustrated embodiment, the LCD screen has 16 areas.

[0264] The area of the photographing area 3030 of the image acquisition device is advantageously larger than that of a single area 3010, which reduces, for example, the optical error of the image acquisition device.

[0265] The image acquisition device acquires the light intensity distribution of the light passing through the screen by photographing 16 times, for example.

[0266] In some embodiments, the image acquisition device photographs an image of a single area 3010 each time. After repeating 16 times, images of all areas of the LCD screen are obtained.

[0267] Alternatively, the image acquired by the image acquisition device covers a single area 3010, and two images partially overlap so that a single bright point is photographed twice. After repeating 16 times, images of all areas of the LCD screen are obtained.

[0268] Figure 31 An image of a single area of the LCD screen is shown. By setting the light-emitting component and / or the LCD screen, multiple points 3240 in a single area 3110 are illuminated. It can be understood that a single point 3140 has different pixel sizes. For example, a single point 3240 includes 2x2 pixels, 4x4 pixels, 8x10 pixels, 12x12 pixels. Fewer pixels in a single point are beneficial to increasing the image acquisition efficiency or calibration efficiency of the LCD screen, while more pixels in a single point are beneficial to increasing the image acquisition accuracy or calibration accuracy of the LCD screen.

[0269] After acquiring images of multiple areas of the LCD screen, they can be combined or merged to obtain an image of the entire screen. The gray levels of different areas in the image can represent the light intensities of different areas of the LCD screen.

[0270] Figure 32The grayscale distribution of the image of the entire screen is shown. The grayscale of the screen 3210 is 156 in one area, 138 in an adjacent area, and 128 in the remaining areas. It can be understood that the grayscales of multiple areas of the screen 3210 are inconsistent, so the light intensity of the light passing through multiple areas of the screen 3210 is uneven on the screen 3210.

[0271] Figure 33 Shows a mask for the Figure 32 screen, Figure 34 Shows the grayscale distribution of the image after applying the mask. The mask 3310 is applied to the screen 3210 to weaken the light intensity of at least one area of the screen 3210 with a higher light intensity. After the mask is applied to the screen, the light intensity of the light passing through the screen is uniform in multiple areas of the screen, as Figure 34 shown.

[0272] When multiple light-emitting components of the optical module can be independently controlled, the light intensity of the light-emitting components can be adjusted to achieve light intensity adjustment at the LCD screen.

[0273] In Figure 32 the illustrated embodiment, the grayscales of the areas with grayscales of 156 and 138 are greater than the grayscales of the remaining areas. The light intensity of these two areas can be reduced so that the grayscale values of all areas of the obtained grayscale image are basically 128. For example, reduce the light intensity of the light-emitting component that projects light to this area. Specifically, by reducing the drive current or PWM (Pulse Width Modulation) of the light-emitting component.

[0274] Alternatively, the light intensity of some areas can be increased so that the grayscale values of all areas of the obtained grayscale image are basically 156. For example, increase the light intensity of the light-emitting component that projects light to these areas. Specifically, by increasing the drive current or PWM of the light-emitting component.

[0275] In some embodiments, the light intensity performance of a single area of the test screen under different drive currents or PWMs of the light-emitting component is tested, and a mapping table or curve graph is made based on the results of multiple tests.

[0276] Figure 35 Shows the screen light intensity - current curve of the light-emitting component according to some embodiments. This curve is obtained by fitting the data of multiple tests, for example. When the drive current of the light-emitting component is Ia, the light intensity of the screen is Pa. When the drive current of the light-emitting component is Ib, the light intensity of the screen is Pb.

[0277] In some embodiments, when it is desired to reduce the light intensity of the screen from Pb to Pa, the drive current of the light-emitting component can be adjusted to Ia.

[0278] In some embodiments, when the light intensity of the desired screen rises from Pa to Pb, the driving current of the light-emitting component can be adjusted to Ib.

[0279] It can be understood that when using an optical module or optical system capable of independently controlling multiple light-emitting components, the driving current or PWM of at least one light-emitting component among all the light-emitting components is changed to change the light intensity of this at least one light-emitting component, and thus change the light intensity of the display area of the screen associated with this at least one light-emitting component.

[0280] In some embodiments, light intensity uniformity calibration is performed on the optical module or the light-emitting component. For example, an image acquisition device (camera or video camera) is used to photograph at least two light-emitting components

[0281] Figure 36 The light-emitting components are shown divided into multiple groups. In Figure 36 In the illustrated embodiment, the LCD screen has 9 groups. Each group has at least one light-emitting component, such as 1, 2, 3, 4. Each light-emitting component includes at least one LED, such as a single LED or multiple LEDs. The wavelength bands of the light emitted by the multiple LEDs can be the same or different.

[0282] The area of the shooting area 3630 of the image acquisition device is advantageously larger than the area of the light-emitting components of a single group 3610, which reduces the optical error of the image acquisition device, for example.

[0283] The image acquisition device acquires the light intensity distribution of the emitted light through, for example, 9 shootings.

[0284] In some embodiments, the image acquisition device shoots an image of a single group 3610 each time. After repeating 9 times, images of all the light-emitting components are obtained.

[0285] Alternatively, the image acquired by the image acquisition device covers a single group 3610, and two images partially overlap so that a single bright point is photographed twice. After repeating 9 times, images of all the light-emitting components are obtained.

[0286] Alternatively, the image acquired by the image acquisition device at one time covers the light-emitting components of all the groups.

[0287] Figure 37 The gray-scale distribution of the image of all the light-emitting components is shown. The gray scale of the light-emitting component 3710 is 230 in one area, 210 in another area, and 220 in the remaining areas. The gray scales of multiple areas are inconsistent, for example, due to the different light-emitting performances of the UVLEDs of different light-emitting components.

[0288] It is possible to adjust the driving current or PWM of the light-emitting component to adjust the light intensity of the light-emitting component. For example, increasing the driving current to obtain increased light intensity, or decreasing the PWM to obtain decreased light intensity.

[0289] Figure 38 The light intensity - PWM curve of the light-emitting component according to some embodiments is shown. This curve is obtained by fitting the data of multiple tests, for example. When the PWM of the light-emitting component is PWM1, the light intensity of the screen is P1. When the PWM of the light-emitting component is PWM2, the light intensity of the screen is P2.

[0290] In some embodiments, when it is desired to reduce the light intensity of the screen from P2 to P1, the PWM of the light-emitting component can be adjusted to PWM1.

[0291] In some embodiments, when it is desired to increase the light intensity of the screen from P1 to P2, the PWM of the light-emitting component can be adjusted to PWM2.

[0292] Figure 39 The gray-scale distribution of the image of the adjusted light-emitting component is shown. The gray scale of the images of all the light-emitting components 3710 is 220. For example, by adjusting the driving current or PWM of one or more light-emitting components, the light intensity of the light-emitting component is increased or decreased.

[0293] In some embodiments, first, the light intensity uniformity of the light-emitting components of the light-emitting module is adjusted (for example, by adjusting the driving current or PWM) to make the light intensity emitted by the light-emitting components uniform. Then, under the radiation of the adjusted light-emitting components, the light intensity uniformity of the light passing through the LCD screen is adjusted, for example, by applying a mask.

[0294] In some embodiments, under a reference light source (which emits light with uniform light intensity), the light intensity uniformity of the light passing through the LCD screen is adjusted, for example, by applying a mask. Independently, the light intensity uniformity of the light-emitting components of the light-emitting module is adjusted (for example, by adjusting the driving current or PWM) to make the light intensity emitted by the light-emitting components uniform.

[0295] It can be understood that when using an optical module or optical system capable of independently controlling multiple light-emitting components, the driving current or PWM of at least one light-emitting component among all the light-emitting components is changed to change the light intensity of this at least one light-emitting component, and thus change the light intensity of the display area of the screen associated with this at least one light-emitting component.

[0296] In some embodiments, optical calibration is also performed on the image capture device so that the gray scales of the images obtained by the image capture device under a reference light source (emitting light with uniform light intensity) are consistent.

[0297] In some embodiments, when obtaining the light intensity performance of light passing through an LCD screen, for example, an optical probe is alternatively used to detect the light intensity distribution instead of using an image capturing device to obtain the gray-scale distribution.

[0298] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for adjusting the light intensity uniformity of an optical system, characterized in that, The optical system includes an optical module and an LCD screen, where the LCD screen includes a plurality of target areas, and each target area is associated with at least one light-emitting component of the optical module. The method includes: - Radiating light at least to a first target area and a second target area among the plurality of target areas of the LCD screen through the light-emitting components of the optical module; - Determining the light intensity distribution of the light passing through the first target area and the second target area, and based on the difference in the light intensity distribution, performing at least one of the following: - Adjusting the drive current or PWM of the light-emitting component associated with the first target area; - Adjusting the drive current or PWM of the light-emitting component associated with the second target area; - Providing or adjusting a mask associated with the first target area; or - Providing or adjusting a mask associated with the second target area.

2. The method according to claim 1, wherein each target area includes one or more display areas, and each display area is irradiated by at least one light-emitting component.

3. The method according to claim 2, wherein, - Each display area is irradiated by a single light-emitting component; or - Each display area is irradiated by a single central light-emitting component and at least one light-emitting component arranged adjacent to the central light-emitting component.

4. According to the method described in claim 1, the determining the light intensity distribution of the light passing through the first target area and the second target area includes: Detect the light intensity at the first target area and the second target area of the LCD screen using a light intensity detection device.

5. The method according to claim 4, wherein when the light intensity of the first target area is greater than the light intensity of the second target area, provide or adjust a mask associated with the first target area.

6. The method according to claim 1, wherein the determining the light intensity distribution of the light passing through the first target area and the second target area includes: Use an image acquisition device to acquire images of the first target area and the second target area of the LCD screen, and determine the gray-scale distribution of the images.

7. The method according to claim 6, wherein The difference in the light intensity distribution includes the difference in the gray-scale values of the images.

8. The method according to claim 7, wherein the image includes a first part associated with the first target area and a second part associated with the second target area, and when the gray scale of the first part is greater than the gray scale of the second part, provide or adjust a mask associated with the first target area.

9. The method according to claim 1, wherein the mask is configured in a multiplicative operation or an additive operation manner.

10. The method according to claim 1, further includes at least one of the following: - Measuring the light intensity of the light-emitting component associated with the first target area at different drive currents or PWMs; or - Measuring the light intensity of the light-emitting component associated with the second target area at different drive currents or PWMs.

11. The method according to claim 10, wherein, - The adjustment of the drive current or PWM of the light-emitting component associated with the first target area includes: adjusting the drive current or PWM of the light-emitting component associated with the first target area based on multiple sets of data measured for the first target area; or - The adjustment of the drive current or PWM of the light-emitting component associated with the second target area includes: adjusting the drive current or PWM of the light-emitting component associated with the second target area based on multiple sets of data measured for the second target area.

12. The method according to claim 1, further includes at least one of the following: - Measure the light intensity at the first target area under different drive currents or PWMs of the light-emitting component associated with the first target area; or - Measure the light intensity at the second target area under different drive currents or PWMs of the light-emitting component associated with the second target area.

13. The method according to claim 12, wherein - Adjusting the drive current or PWM of the light-emitting component associated with the first target area includes: adjusting the drive current or PWM of the light-emitting component associated with the first target area based on multiple sets of measured data associated with the first target area; or - Adjusting the drive current or PWM of the light-emitting component associated with the second target area includes: adjusting the drive current or PWM of the light-emitting component associated with the second target area based on multiple sets of measured data associated with the second target area.

14. A method for manufacturing a three-dimensional object by radiation, characterized in that, Comprising: Using the method according to claim 1 to adjust the light intensity uniformity of the optical system; Radiate light through the first set of light-emitting components of the optical system so that the light passes through the LCD screen of the optical system and radiates the printing material to obtain the first layer of the three-dimensional object; Radiate light through the second set of light-emitting components of the optical system so that the light passes through the LCD screen of the optical system and radiates the printing material to obtain the second layer of the three-dimensional object, wherein the first set of light-emitting components is different from the second set of light-emitting components.

15. The method according to claim 14, wherein - At the bottom of the printing material, the light passing through the LCD screen of the optical system cures the printing material; or - At the liquid level of the printing material, the light passing through the LCD screen of the optical system cures the printing material.

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