Light source apparatus and laser projection device

Abstract

A light source apparatus and a laser projection device. The light source apparatus (01) comprises a laser source (100), a fluorescence conversion part (200) and a light filter part (300). The fluorescence conversion part (200) comprises a plurality of first areas (200a) arranged in the circumferential direction, and the light filter part (300) comprises a plurality of second areas (300a) arranged in the circumferential direction. The rotation speed of the light filter part (300) is greater than the rotation speed of the fluorescence conversion part (200), and the rotation speed of the light filter part (300) is m times the rotation speed of the fluorescence conversion part (200), the number of the second areas being 1 / m of the number of the first areas. Since the light filter part (300) has a relatively faster rotation speed and there are a smaller number of second areas (300a) in the light filter part (300), when the light filter part (300) rotates one round, it will take less total time for a light spot to pass through interfaces of the adjacent second areas (300a) of the light filter part (300), thereby shortening color mixing time and reducing mixed light.

Description

Light source device and laser projection equipment

[0001] This application claims priority to Chinese patent application No. 202311029701.3, filed on August 15, 2023, with the invention name “Laser light source system and projection equipment”, and claims priority to Chinese patent application No. 202322199298.0, filed on August 15, 2023, with the utility model name “Laser light source system and projection equipment”, and also claims priority to Chinese patent application No. 202311198812.7, filed on September 15, 2023, with the invention name “Laser projection equipment, color wheel control method, device and storage medium”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of projection technology, and in particular to a light source device and a laser projection equipment. Background Art

[0003] Laser light sources are electroluminescent devices that utilize excited particles to emit light under stimulated radiation. They feature excellent monochromaticity, strong directionality, and high brightness, making them widely used in projection display devices. Existing laser light source systems typically use lasers to illuminate a phosphor wheel, which then emits different colored light. The light from the phosphor wheel is filtered by a color filter wheel before entering a uniform light integrator. This light is then sequentially illuminated by the display unit, producing the displayed image.

[0004] Existing phosphor wheels and color filter wheels both have multiple partitions, with distinct boundaries between adjacent partitions. Light of different colors also has corresponding boundaries when it is output. However, in actual applications, the light spot has a certain size. When the light spot passes through the boundary between adjacent partitions of the color wheel (a general term for phosphor wheels and color filter wheels), it will illuminate the boundary. At this time, since the light spot is located on two partitions and the colors of the light emitted by the two partitions are different, there is a situation where the colors of the emitted light are mixed after the light spot passes through the boundary between the two partitions, that is, mixed color light is generated. The presence of this mixed color light will affect the display effect of the laser optical system.

[0005] Summary of the Invention

[0006] This application provides a light source device and a laser projection device. This application provides the following technical solutions:

[0007] In a first aspect, the present application provides a laser projection light source, comprising: a laser light source, a fluorescence conversion unit, and a filter unit;

[0008] The fluorescence conversion portion is located on the output light path of the laser light source, and the fluorescence conversion portion includes a plurality of first regions arranged along a circumferential direction;

[0009] The filter section is located on the output light path of the fluorescence conversion section, and the filter section includes a plurality of second regions arranged along a circumferential direction, and the plurality of first regions are distributed correspondingly to the plurality of second regions;

[0010] The rotation speed of the filter unit is m times the rotation speed of the fluorescence conversion unit, the number of the second regions is 1 / m of the number of the first regions, and m is a positive rational number greater than 1.

[0011] A second aspect of the present application provides a laser projection device, comprising the laser projection light source shown above, a light modulation component and a projection lens;

[0012] The light modulation component is located at the light output side of the laser projection light source, and the light modulation component is used to modulate the light emitted by the laser projection light source;

[0013] The projection lens is located on the light-emitting side of the light modulation component.

[0014] The beneficial effects of the technical solutions provided in the embodiments of the present application include at least:

[0015] Because the filter rotates at m times the speed of the fluorescence conversion unit, the number of second regions in the filter is 1 / m of the number of first regions in the fluorescence conversion unit, where m is a rational number greater than 1. Therefore, the filter rotates relatively quickly, and the number of second regions in the filter is relatively small. Thus, during one rotation of the filter, the total time it takes for the light spot to pass through the boundaries of adjacent second regions on the filter is reduced, thereby shortening the color mixing time, reducing mixed light, and thereby improving the display quality of the laser optical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] FIG1 is a schematic structural diagram of a light source device provided in an embodiment of the present application;

[0018] FIG2 is a top view of a fluorescence conversion portion provided by an embodiment of the present disclosure;

[0019] FIG3 is a top view of a filter portion provided by an embodiment of the present disclosure;

[0020] FIG4 is a top view of another fluorescence conversion portion provided in an embodiment of the present application;

[0021] FIG5 is a top view of another filter portion provided in an embodiment of the present application;

[0022] FIG6 is a schematic structural diagram of another light source device provided in an embodiment of the present application;

[0023] FIG7 is a schematic structural diagram of another light source device provided in an embodiment of the present application;

[0024] FIG8 is a schematic structural diagram of a laser projection device provided in an embodiment of the present application;

[0025] FIG9 is a schematic diagram of a projection imaging optical path of a laser projection device provided in an embodiment of the present application;

[0026] FIG10 is a schematic structural diagram of a fluorescence conversion unit in an 8-segment color wheel provided in an embodiment of the present application;

[0027] FIG11 is a schematic structural diagram of a filter portion in an 8-segment color wheel provided in an embodiment of the present application;

[0028] FIG12 is a schematic structural diagram of a fluorescence conversion unit in a four-segment color wheel provided in an embodiment of the present application;

[0029] FIG13 is a schematic structural diagram of a filter portion in a four-segment color wheel provided in an embodiment of the present application;

[0030] FIG14 is a schematic structural diagram of a laser projection device based on a monochromatic laser projection technology provided in an embodiment of the present application;

[0031] FIG15 is a schematic flow chart of an existing color wheel control method;

[0032] FIG16 is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0033] FIG17 is a flow chart of a color wheel control method provided in an embodiment of the present application;

[0034] FIG18 is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0035] FIG19 is a flow chart of another color wheel control method provided in an embodiment of the present application;

[0036] FIG20 is a schematic structural diagram of a color wheel control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0038] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other in the absence of conflict.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0040] Please refer to Figure 1, which is a schematic diagram of a light source device according to an embodiment of the present application. The light source device 01 includes a laser light source 100, a fluorescence conversion unit 200, and a filter unit 300.

[0041] The fluorescence conversion unit 200 in the light source device 01 is located in the output light path of the laser light source 100. The fluorescence conversion unit 200 in the light source device 01 is also called a fluorescence wheel. During operation of the light source device 01, the fluorescence conversion unit 200 is required to rotate. As shown in FIG2 , which is a top view of a fluorescence conversion unit provided in an embodiment of the present disclosure, the fluorescence conversion unit 200 may include multiple first regions 200a arranged along a circumferential direction. Here, at least one of the multiple first regions 200a is a fluorescence region. For example, the fluorescence conversion unit 200 may include a fluorescence region of a single color, which is capable of emitting fluorescence of a single color. For another example, the fluorescence conversion unit 200 may include fluorescence regions of multiple different colors, each capable of emitting fluorescence of different colors. In other possible implementations, the multiple first regions 200a may include not only a first region that is a fluorescence region, but also a first region that is a first light-transmitting region. That is, some of the multiple first regions 200a are fluorescence regions, while others are first light-transmitting regions.

[0042] The filter section 300 in the light source device 01 is arranged on the output light path of the fluorescence conversion section 200. The filter section 300 in the light source device 01 is also called a color filter wheel. During the operation of the light source device 01, the filter section 300 needs to rotate. As shown in Figure 3, Figure 3 is a top view of a filter section provided by an embodiment of the present disclosure. The filter section 300 includes a plurality of second regions 300a arranged along a circumferential direction. The plurality of second regions 300a on the filter section 300 are distributed correspondingly to the plurality of first regions 200a on the fluorescence conversion section 200. Here, at least one second region 300a among the plurality of second regions 300a is a filter region distributed correspondingly to the fluorescence region, and the filter region is used to filter the fluorescence emitted from the fluorescence region to output colored light of the corresponding color. In another possible implementation, the plurality of second regions 300a include, in addition to the second region serving as the filter region, a second region serving as the second light-transmitting region, and the second light-transmitting region is distributed correspondingly to the first light-transmitting region, so that laser light emitted through the first light-transmitting region of the fluorescence conversion unit 200 can also be emitted through the second light-transmitting region of the filter region 300. In other words, some of the second regions 300a serve as the fluorescence region, while others serve as the second light-transmitting region.

[0043] The rotation speed of the filter section 300 is m times that of the fluorescence conversion section 200, and the number of the second regions 300a in the filter section 300 is 1 / m of the number of the first regions 200a in the fluorescence conversion section 200. Here, m is a positive rational number greater than 1.

[0044] That is, the rotation speed of the filter section 300 is greater than the rotation speed of the fluorescence conversion section 200, and the ratio of the rotation speed of the filter section 300 to the rotation speed of the fluorescence conversion section 200 is m. The number of first regions 200 a on the fluorescence conversion section 200 is greater than the number of second regions 300 a on the filter section 300, and the ratio of the number of first regions 200 a to the number of second regions 300 a is also m.

[0045] In this case, even if the rotational speed of the filter section 300 is different from that of the fluorescence conversion section 200, it is possible to ensure that the second region 300a of the filter section 300 and the first region 200a of the fluorescence conversion section 200 are switched synchronously during the rotation of the fluorescence conversion section 200 and the filter section 300. In other words, the filter section 300 and the fluorescence conversion section 200 can be rotated synchronously at different speeds.

[0046] In one specific embodiment, the central angle of each second region 300a on the filter section 300 is m times the central angle of the corresponding first region 200a of the fluorescence conversion section 200. In this case, during the rotation of the fluorescence conversion section 200 and the filter section 300, as the irradiation position of light on the fluorescence conversion section 200 moves from one boundary of the first region 200a to another boundary in the optical path of the light source device 01, the irradiation position of light on the filter section 300 also moves from one boundary of the corresponding second region 300a to another boundary. In other words, during the rotation of the fluorescence conversion section 200 and the filter section 300, when the fluorescence conversion section 200 rotates until the light spot just enters the first region, the filter section 300 also rotates until the light spot just enters the second region; when the fluorescence conversion section 200 rotates until the light spot just leaves the first region, the filter section 300 also rotates until the light spot just leaves the second region. In this way, while ensuring that the filter section 300 and the fluorescence conversion section 200 rotate at different speeds, the synchronization between the filter section 300 and the fluorescence conversion section 200 is further improved.

[0047] It should be noted that m is a positive integer greater than 1, but is not limited to being a positive integer greater than 1.

[0048] For example, when the number of the first regions 200a of the fluorescence conversion section 200 is an integer multiple (e.g., 2 times or 3 times) of the number of the second regions 300a of the filter section 300, the rotational speed of the filter section 300 is an integer multiple (e.g., 2 times or 3 times) of the rotational speed of the fluorescence conversion section 200. For example, when the number of the first regions 200a of the fluorescence conversion section 200 is 6 and the number of the second regions 200a of the filter section 300 is 2, the number of the first regions 200a of the fluorescence conversion section 200 is twice the number of the second regions 300a of the filter section 300, and accordingly, the rotational speed of the filter section 300 is twice the rotational speed of the fluorescence conversion section 200.

[0049] For example, when the number of the first regions 200a of the fluorescence conversion section 200 is a non-integer multiple (e.g., 1.5 times, 2.5 times) of the number of the second regions 300a of the filter section 300, the rotational speed of the filter section 300 is a non-integer multiple (e.g., 1.5 times, 2.5 times) of the rotational speed of the fluorescence conversion section 200. For example, if the number of the first regions 200a of the fluorescence conversion section 200 is 3 and the number of the second regions 300a of the filter section 300 is 2, the number of the first regions 200a of the fluorescence conversion section 200 is 1.5 times the number of the second regions 300a of the filter section 300. Accordingly, the rotational speed of the filter section 300 is 1.5 times the rotational speed of the fluorescence conversion section 200.

[0050] It should be noted that the following embodiments are all schematically described by taking m as a positive integer greater than 1 as an example.

[0051] The light source device provided in the embodiments of the present disclosure sets the rotation speed of the filter section 300 to be greater than the rotation speed of the fluorescence conversion section 200. Furthermore, when the rotation speed of the filter section 300 is greater than the rotation speed of the fluorescence conversion section 200 and the rotation speed of the filter section 300 is m times the rotation speed of the fluorescence conversion section 200, the number of second regions 300a on the filter section 300 is set to be 1 / m of the number of first regions 200a on the fluorescence conversion section 200, and the central angle of each second region 300a is m times the central angle of the corresponding first region 200a. In this way, synchronous switching of the second regions 300a on the filter section 300 and the first regions 200a on the fluorescence conversion section 200 can be achieved. In other words, synchronous switching of the second regions 300a on the filter section 300 and the first regions 200a on the fluorescence conversion section 200 can be achieved by simply increasing the rotation speed of the filter section 300 without changing the rotation speed of the fluorescence conversion section 200.

[0052] Furthermore, because the filter section 300 rotates relatively quickly and has a relatively small number of second regions 300a within it, the total time it takes for the light spot to pass through the boundaries of adjacent second regions 300a on the filter section 300 is reduced during one rotation of the filter section 300. This shortens the color mixing time, reduces mixed light, and thus enhances the display quality of the laser optical system. Furthermore, because the fluorescence conversion section 200 rotates relatively slowly, the noise generated by the fluorescence conversion section 200 during rotation can be reduced while maintaining a heat dissipation design within the fluorescence conversion section 200.

[0053] In the embodiment of the present application, a phosphor layer is provided within the phosphor region of the phosphor conversion unit 200, and the laser light source 100 is a monochromatic light source. For example, the laser light source 100 is a blue light source configured to emit blue laser light. The short wavelength of blue laser light facilitates irradiation of the phosphor layer on the phosphor conversion unit 200, thereby stimulating fluorescence of a different color. Of course, the laser light source 100 can also be a yellow light source configured to emit yellow light. This is not a limitation of the present embodiment. The following embodiments are described using the laser light source 100 configured to emit blue laser light as an example.

[0054] In one embodiment, as shown in Figure 4, which is a top view of another fluorescence conversion portion provided by an embodiment of the present application, the multiple first regions on the fluorescence conversion portion 200 are divided into multiple regional sub-groups, each of which includes at least two first regions, and the color of light emitted by each first region in the same regional sub-group is the same.

[0055] Illustratively, a portion of the first region on the fluorescence conversion portion 200 is the fluorescent region 201, and another portion of the first region is the first light-transmitting region 202. Here, the fluorescent region 201 on the fluorescence conversion portion 200 includes a yellow fluorescent region Y1 and a green fluorescent region G1.

[0056] For example, there are two yellow fluorescent areas Y1, and the two yellow fluorescent areas Y1 form an area group. After the blue laser emitted by the laser light source 100 is irradiated onto the yellow fluorescent area Y1, the fluorescent powder layer provided on the yellow fluorescent area Y1 emits yellow fluorescence under the excitation of the blue laser, and the yellow fluorescence can be reflected by the fluorescence conversion unit 200.

[0057] There are also two green fluorescent areas G1, and the two green fluorescent areas G1 form another area group. After the blue laser emitted by the laser light source 100 is irradiated onto the green fluorescent area G1, the fluorescent powder layer arranged on the green fluorescent area G1 emits green fluorescence under the excitation of the blue laser, and the green fluorescence can be reflected by the fluorescence conversion part 200.

[0058] There are two first light-transmitting regions 202 on the phosphor conversion unit 200, and these two first light-transmitting regions 202 form another region group. After the blue laser light emitted by the laser light source 100 is directed toward the first light-transmitting regions 202, it passes through the first light-transmitting regions 202 and then through the phosphor conversion unit 200. Therefore, the color of the light emitted through the first light-transmitting regions 202 remains blue, and the first light-transmitting regions 202 are also referred to as the first blue light region B1.

[0059] In one specific implementation, as shown in Figure 5, which is a top view of another filter section provided by an embodiment of the present application, the multiple second regions on the filter section 300 correspond one-to-one with the multiple region groups on the fluorescence conversion section 200. Here, light emitted from each first region within the same region group on the fluorescence conversion section 200 is directed toward the corresponding second region on the filter section 300.

[0060] Illustratively, a portion of the second region of the filter section 300 serves as a filter region 301, and another portion of the second region serves as a second light-transmitting region 302. The filter region 301 of the filter section 300 includes a red filter region R2 and a green filter region G2. The red filter region R2 of the filter section 300 corresponds to the yellow fluorescent region Y1 of the fluorescence conversion section 200, and the green fluorescent region G2 of the filter section 300 corresponds to the green fluorescent region G1 of the fluorescence conversion section 200.

[0061] For example, there is only one red filter region R2, which corresponds to a region group containing two yellow fluorescent regions Y1. The yellow fluorescent light emitted by each yellow fluorescent region Y1 is directed toward the red filter region R2, which filters a portion of the yellow fluorescent light, ensuring that the light that passes through the red filter region R2 is red light.

[0062] There is one green filter region G2, corresponding to the group containing two green fluorescent regions G1. The green fluorescent light emitted by each green fluorescent region G1 is directed toward this green filter region G2, which filters a portion of the green fluorescent light, ensuring that the light passing through this green filter region G2 is purer green light.

[0063] The filter section 300 includes only one second light-transmitting region 302, which corresponds to the region grouped with the two first light-transmitting regions 202. The blue laser light emitted by each first light-transmitting region 202 is directed toward this second light-transmitting region 302. The blue laser light is filtered by the wavelength bands of light within the second light-transmitting region 302, resulting in a purer blue light. Therefore, the light emitted by the second light-transmitting region 302 remains blue light, and this second light-transmitting region 302 is also referred to as the second blue light region B2.

[0064] In the embodiment of the present application, as shown in FIG4 , in the fluorescence conversion portion 200 , any two adjacent first regions arranged in the circumferential direction belong to different region groups, that is, the first regions in different region groups are arranged alternately.

[0065] In one embodiment, as shown in FIG4 , at least two first regions arranged continuously in the circumferential direction and belonging to different region groups in the fluorescence conversion portion 200 are used to form a group of periodically arranged regions. Here, the same group of periodically arranged regions includes at least one fluorescent region 201 and one first light-transmitting region 202.

[0066] As shown in FIG5 , in the filter section 300 , the plurality of second regions include: at least one filter region 301 corresponding one-to-one to at least one fluorescent region 201 in a group of periodically arranged regions, and a second light-transmitting region 302 corresponding to one first light-transmitting region 202 in a group of periodically arranged regions.

[0067] For example, assuming that in the fluorescence conversion section 200, a yellow fluorescent region Y1, a first light-transmitting region 201, and a green fluorescent region G1 form a group of periodically arranged regions, and that the fluorescence conversion section 200 includes two groups of periodically arranged regions, then the yellow fluorescent region Y1 in each group of periodically arranged regions in the fluorescence conversion section 200 corresponds to a red fluorescent region R2 in the filter section 300; the first light-transmitting region 201 in each group of periodically arranged regions in the fluorescence conversion section 200 corresponds to a second light-transmitting region 302 in the filter section 300; and the green fluorescent region G1 in each group of periodically arranged regions in the fluorescence conversion section 200 corresponds to a green filter region G2 in the filter section 300.

[0068] In the embodiment of the present application, the sum of the central angles of the first regions in the same region group on the fluorescence conversion portion 200 is equal to the central angle of the corresponding second region on the filter portion 300 .

[0069] In one embodiment, each region group on the fluorescence conversion portion 200 includes two first regions. The two first regions in the same region group are arranged opposite to each other, and the central angles of the two first regions in the same region group are the same.

[0070] For example, if the first region in a region group is a yellow fluorescent region Y1, the first region group includes two yellow fluorescent regions Y1. These two yellow fluorescent regions Y1 are arranged opposite each other, and their central angles are the same. For example, the central angle of each yellow fluorescent region Y1 is 89°. Thus, the central angle of the second region (i.e., the red filter region R2) in the filter portion 300 corresponding to the two yellow fluorescent regions Y1 is 178°.

[0071] When the first region in a region group is a green fluorescent region G1, the first region group includes two green fluorescent regions G1. These two green fluorescent regions G1 are arranged opposite each other and have the same central angle. For example, the central angle of each green fluorescent region G1 is 63°. Thus, the central angle of the second region (i.e., the green filter region G2) in the filter portion 300 corresponding to the two green fluorescent regions G1 is 126°.

[0072] When the first region in a region group is a first light-transmitting region 202, the first region group includes two first light-transmitting regions 202. These two first light-transmitting regions 202 are arranged opposite each other and have the same central angle. For example, the central angle of each first light-transmitting region 202 is 28°. Thus, the central angle of the second region (i.e., the second light-transmitting region 302) in the filter portion 300 corresponding to the two first light-transmitting regions 202 is 56°.

[0073] In this case, the fluorescence conversion section 200 includes two yellow fluorescent regions Y1, two green fluorescent regions G1, and two first light-transmitting regions 202. In other words, the number of first regions in the fluorescence conversion section 200 is six. The filter section 300 includes one red filter region R2, one green filter region G2, and one second light-transmitting region 302. In other words, the number of second regions in the filter section 300 is three. Therefore, the ratio m of the first regions in the fluorescence conversion section 200 to the second regions in the filter section 300 is equal to 2.

[0074] To this end, the rotation speed of the filter section 300 is twice that of the fluorescence conversion section 200, and the central angle of each second region in the filter section 300 is twice the central angle of the corresponding first region in the fluorescence conversion section 200. For example, the central angle of the red filter region R2 in the filter section 300 is twice the central angle of the single yellow fluorescence region Y1 in the fluorescence conversion section 200; the central angle of the green filter region G2 in the filter section 300 is twice the central angle of the single green fluorescence region G1 in the fluorescence conversion section 200; and the central angle of the second light-transmitting region 302 in the filter section 300 is twice the central angle of the single first light-transmitting region 202 in the fluorescence conversion section 200.

[0075] For example, during the rotation of the fluorescence conversion section 200 and the filter section 300, when the laser light emitted by the laser light source 100 just enters the yellow fluorescence region Y1 of the fluorescence conversion section 200, the light passing through the fluorescence conversion section 200 and directed toward the filter section 300 also just enters the red filter region R2 of the filter section 300. Thus, because the rotation speed of the filter section 300 is twice that of the fluorescence conversion section 200, the central angle of the red filter region R2 of the filter section 300 is also twice that of the yellow fluorescence region Y1 of the fluorescence conversion section 200. Therefore, the time it takes for the fluorescence conversion section 200 to rotate 89° is equal to the time it takes for the filter section 300 to rotate 178°. Thus, when the laser light emitted by the laser light source 100 just exits the yellow fluorescence region Y1 of the fluorescence conversion section 200, the light passing through the fluorescence conversion section 200 and directed toward the filter section 300 also just exits the red filter region R2 of the filter section 300.

[0076] When the laser light emitted by the laser light source 100 just enters the first light-transmitting region 202 of the fluorescence conversion section 200, the light passing through the fluorescence conversion section 200 and directed toward the filter section 300 also just enters the second light-transmitting region 302 of the filter section 300. Because the rotation speed of the filter section 300 is twice that of the fluorescence conversion section 200, the central angle of the second light-transmitting region 302 of the filter section 300 is also twice the central angle of the first light-transmitting region 202 of the fluorescence conversion section 200. Therefore, the time it takes for the fluorescence conversion section 200 to rotate 28° is equal to the time it takes for the filter section 300 to rotate 56°. Thus, when the laser light emitted by the laser light source 100 just exits the first light-transmitting region 202 of the fluorescence conversion section 200, the light passing through the fluorescence conversion section 200 and directed toward the filter section 300 also just exits the second light-transmitting region 302 of the filter section 300.

[0077] When the laser light emitted by the laser light source 100 just enters the green fluorescent region G1 of the fluorescence conversion section 200, the light passing through the fluorescence conversion section 200 and directed toward the filter section 300 also just enters the green filter region G2 of the filter section 300. Because the rotation speed of the filter section 300 is twice that of the fluorescence conversion section 200, the central angle of the green filter region G2 of the filter section 300 is also twice that of the green fluorescent region G1 of the fluorescence conversion section 200. Therefore, the time it takes for the fluorescence conversion section 200 to rotate 63° is equal to the time it takes for the filter section 300 to rotate 126°. Therefore, when the laser light emitted by the laser light source 100 just exits the green fluorescent region G1 of the fluorescence conversion section 200, the light passing through the fluorescence conversion section 200 and directed toward the filter section 300 also just exits the green filter region G2 of the filter section 300.

[0078] In this way, the fluorescence conversion unit 200 rotates half a revolution, causing the yellow fluorescence region Y1, the first light-transmitting region 202, and the green fluorescence region G1 to receive illumination from the laser light source 100 and sequentially output yellow fluorescence, blue laser light, and green fluorescence. During this process, the filter unit 300 rotates one revolution, causing the red filter region R2, the first light-transmitting region 202, and the green filter region G2 to receive and filter yellow fluorescence, blue laser light, and green fluorescence, respectively, and sequentially output red, blue, and green light. Thus, the fluorescence conversion unit 200 rotates one revolution to output two sequential lights, while the filter unit 300 rotates two revolutions to filter the two sequential lights output by the fluorescence conversion unit 200.

[0079] It should be noted that the number and color of the fluorescent areas contained in the above-mentioned first area are not limited to the above-mentioned limitations. Correspondingly, the number and color of the filter areas contained in the above-mentioned second area are also not limited to the above-mentioned limitations. In specific implementation, they can be reasonably set according to actual needs.

[0080] Further, referring to Figure 6, Figure 6 is a schematic diagram of the structure of another light source device provided in an embodiment of the present application. Light source device 01 also includes a light homogenization component 500. This light homogenization component 500 is disposed in the output light path of the filter unit 300 and is used to receive the colored light output by the filter unit 300 after filtering, transmit it to the processor for processing, and then project it onto the screen.

[0081] Here, when light passing through the boundary between two adjacent second regions in the filter 300 enters the light homogenizing component 500, the light received by the light homogenizing component 500 is a mixture of the two colors of light filtered by the two second regions. Therefore, by increasing the rotation speed of the filter 300 and reducing the number of second regions in the filter 300, the time for the mixed light to appear is reduced, thereby improving the quality of the screen display.

[0082] In the embodiment of the present application, when a first region of the aforementioned fluorescence conversion section 200 outputs light of a certain color, the corresponding second region on the filter section 300 is blocked in front of the light homogenizing component 500 to filter the light of this color to obtain light of the corresponding color. When two adjacent first regions alternately switch, the corresponding two adjacent second regions also switch accordingly, so that the multiple second regions switch synchronously with the multiple first regions. The fluorescence conversion section 200 rotates so that different first regions alternately receive illumination from the laser light source 100 and emit light of different colors, thereby causing the fluorescence conversion section 200 to output time-sequential light of alternating different colors. Correspondingly, the filter section 300 rotates so that the second regions that filter light of different colors alternately receive the time-sequential light output by the fluorescence conversion section 200, and the alternating timing between the second regions is the same as the timing of the fluorescence conversion section 200 outputting the time-sequential light of different colors, thereby causing the filter section 300 to synchronously filter the time-sequential light of different colors emitted by the fluorescence conversion section 200.

[0083] In one specific implementation, the radius of the fluorescence conversion section 200 is equal to the radius of the filter section 300. Of course, the radius of the fluorescence conversion section 200 may also be smaller than the radius of the filter section 300. When the rotation speed of the filter section 300 is twice that of the fluorescence conversion section 200, the fluorescence conversion section 200 rotates half a circle, and each first region in the same group of periodically arranged regions in the fluorescence conversion section 200 alternates and outputs time-sequential light of alternating colors. Simultaneously, when the filter section 300 rotates one circle, each second region in the filter section 300 sequentially and synchronously filters the time-sequential light of alternating colors output by the fluorescence conversion section 200. Since the rotation speed of the filter section 300 is twice that of the fluorescence conversion section 200, the time required for the boundary line of two adjacent second areas of the filter section 300 to sweep across the light homogenizing component 500 is half of the time required when the rotation speeds of the conventional fluorescence conversion section 200 and the filter section 300 are the same, thereby reducing the proportion of time occupied by the mixed light in the timing light filtered by the filter section 300, thereby improving the display effect.

[0084] In a conventional laser light source system, the filter section 300 rotates at the same speed as the fluorescence conversion section 200, and the number of first regions on the fluorescence conversion section 200 is equal to the number of second regions on the filter section 300. This allows the filter section 300 to synchronously filter the alternating color sequential light output by the fluorescence conversion section 200. For example, when the fluorescence conversion section 200 includes six first regions, there are six intersection lines between the six first sub-regions. Similarly, the filter section 300 includes six second regions, resulting in six intersection lines. When the fluorescence conversion section 200 rotates one revolution to output sequential light from the six first regions, the filter section 300 also needs to rotate one revolution to synchronously filter the sequential light from the six first regions. The light homogenizing component 500 needs to be swept by the six intersection lines on the filter section 300 to receive six mixed lights.

[0085] In the disclosed embodiment, when the rotation speed of the filter section 300 is twice that of the fluorescence conversion section 200, six first regions are provided on the fluorescence conversion section 200, while only three second regions are provided on the filter section 300. This allows for synchronous filtering of the color light output by the fluorescence conversion section 200. Therefore, when the filter section 300 has three intersection lines and the fluorescence conversion section 200 still outputs sequential light from the six first regions, the filter section 300 rotates two revolutions to filter the sequential light from the six first regions. The light homogenizing component 500 is swept twice by each of the three intersection lines on the filter section 300, resulting in the light homogenizing component 500 still receiving six mixed lights. However, the speed at which each intersection line of the filter section 300 sweeps across the light homogenizing component 500 is twice the speed at which each intersection line of the filter section 300 sweeps across the light homogenizing component 500 in a conventional laser light source system. Therefore, the time taken by the light uniforming component 500 to receive the mixed light in the six sequential lights of the first region is halved, thereby reducing the time taken by the light uniforming component 500 to receive the mixed light within the cycle of receiving the six sequential lights.

[0086] In some embodiments, the fluorescence conversion unit 200 has a first marking point, and the filter unit 300 has a second marking point. During the rotation of the fluorescence conversion unit 200 and the filter unit, the first marking point and the second marking point can overlap multiple times on the optical path of the light source device 01, and the number of rotations of the filter unit 300 from one overlap to the next overlap is m times the number of rotations of the fluorescence conversion unit 200.

[0087] Specifically, a first marking point is provided at the edge of the first area on the fluorescence conversion part 200, and a second marking point is provided at the edge of the second area of ​​the filter part 300. The fluorescence conversion part 200 and the filter part 300 start to rotate when the first marking point and the second marking point coincide at a preset position. When the fluorescence conversion part 200 rotates one circle and the filter part 300 rotates m circles, the second marking point reaches the set position for the Nth time and coincides with the first marking point, thereby determining that the first area corresponding to the first marking point and the second area corresponding to the second marking point are synchronized.

[0088] Of course, the first marking point can also be set at the boundary between two adjacent first regions on the fluorescence conversion unit 200, and the second marking point can be set at the boundary between two adjacent regions on the filter wheel 300, with the second regions on either side of the second marking point corresponding one-to-one with the first regions on either side of the first marking point. Specifically, the first marking point is set at the boundary between the yellow fluorescence region Y1 and the green fluorescence region G1 of the fluorescence conversion unit 200, and the second marking point is set at the boundary between the red filter region R2 and the green filter region G2 of the filter unit 300. Before the fluorescence conversion unit 200 and the filter unit 300 begin rotating, the first and second marking points overlap on the optical path of the laser light source 100, and this position is the preset position. Of course, any point along the circumference of the fluorescence conversion unit 200 can also be set as the preset position, as long as the first and second marking points overlap at the preset position. A detector is provided at the preset position, and the detector detects whether the first mark point and the second mark point at the preset position coincide with each other. That is, the position of the detector is set to the preset position. When the fluorescence conversion unit 200 and the filter wheel 31 start to rotate, the first mark point and the second mark point need to be coincident at the preset position before they start to rotate simultaneously.

[0089] When the fluorescence conversion part 200 rotates one circle, the filter part 300 rotates m circles. At this time, the first mark point and the second mark point are in an overlapping state. By simply checking whether the first mark point and the second mark point overlap at the preset position each time the fluorescence conversion part 200 rotates one circle, it is possible to check whether the first area and the second area are synchronized, thereby achieving the effect of checking whether the first area of ​​the fluorescence conversion part 200 and the second area of ​​the filter part 300 are synchronized through the first mark point and the second mark point.

[0090] In one embodiment, as shown in FIG6 , the light source device 01 further includes a first drive motor 600 and a second drive motor 700 . The first drive motor 600 is connected to the fluorescence conversion unit 200 for driving the fluorescence conversion unit 200 to rotate; the second drive motor 700 is connected to the filter unit 300 for driving the filter unit 300 to rotate.

[0091] Illustratively, the rotation axis of the fluorescence conversion section 200 is connected to the first drive motor 600, and the rotation axis of the filter section 300 is connected to the second drive motor 700. The rotation axis of the fluorescence conversion section 200 is parallel to the direction of the laser light emitted by the laser light source 100, so that the laser light emitted by the laser light source 100 is perpendicular to the surface of the fluorescence conversion section 200. The rotation axis of the filter section 300 is parallel to the propagation direction of the color light output by the fluorescence conversion section 200, so that the color light output by the fluorescence conversion section 200 is perpendicular to the surface of the filter section 300.

[0092] In this embodiment of the present application, when the rotational speed of the filter section 300 is twice that of the fluorescence conversion section 200, the output frequency of the first drive motor 600 is 120 Hz, and the output frequency of the second drive motor 7000 is 240 Hz. Here, when the output frequency of the first drive motor 600 is 120 Hz, the first drive motor 600 drives the fluorescence conversion section 200 to rotate 120 revolutions per second and the filter section 300 to rotate 7,200 revolutions per minute. When the output frequency of the second drive motor 700 is 230 Hz, the second drive motor 700 drives the filter section 300 to rotate 240 revolutions per second and 14,400 revolutions per minute.

[0093] In this application, since the fluorescence conversion unit 200 is located near the laser light source 100, which generates heat during operation, the use of a 120Hz first drive motor 600 prevents excessive heat generation during operation, which would otherwise increase the heat dissipation burden of the light source device. However, since the filter unit 300 is located farther from the laser light source 100, the use of a 240Hz second drive motor 700 does not affect the heat dissipation of the light source device. Thus, by properly selecting the output frequencies of the first and second drive motors 600 and 700, the stability of the light source device's operation is ensured.

[0094] In the embodiment of the present application, when the light source device 01 needs to control the activation of the fluorescence conversion unit 200 and the filter unit 300, it directly drives the fluorescence conversion unit 200 to rotate at 120 Hz and drives the filter unit 300 to rotate at 240 Hz. Of course, the activation of the fluorescence conversion unit 200 and the filter unit 300 can also be controlled in the following manner.

[0095] For example, both the fluorescence conversion section 200 and the filter section 300 have marking points, and the number of marking points provided on the fluorescence conversion section 200 is different from the number of marking points provided on the filter section 300. Here, one of the marking points provided on the fluorescence conversion section 200 is the first marking point in the above-described embodiment, and one of the marking points provided on the filter section 300 is the second marking point described above. Of course, each marking point provided on the fluorescence conversion section 200 may also be different from the first marking point described above, and each marking point provided on the filter section 300 may also be different from the second marking point described above. This embodiment of the present application is not limited to this.

[0096] The light source device further comprises: a digital light processing device, a detection device and a control device. Here, the control device is connected to the digital light processing device and the detection device respectively.

[0097] The digital light processing device is configured to control the rotation of a target color wheel, which is a fluorescence conversion unit or a filter unit, according to a preset drive frequency. The detection device is configured to detect the frequency of identifying the marking points on the target color wheel based on the frequency of identifying the marking points on the target color wheel. The control device is configured to determine the type of the target color wheel based on the frequency of identifying the marking points on the target color wheel and send an instruction to the digital light processing device to rotate the target color wheel according to the corresponding rated rotation frequency.

[0098] Exemplarily, after powering on, the digital light processing device controls the fluorescence conversion unit and the filter unit to rotate at a preset drive frequency. Because the fluorescence conversion unit and the filter unit have different numbers of marking points, the frequency at which the detection device detects the marking points on the fluorescence conversion unit differs from the frequency at which the detection device detects the marking points on the filter unit. Therefore, the control device distinguishes the fluorescence conversion unit and the filter unit based on the frequencies of the marking points, causing the control device to send corresponding instruction information, thereby causing both the fluorescence conversion unit and the filter unit to rotate at their respective rated rotational frequencies.

[0099] In the present application, the rated rotational frequency of the filter section is twice the rated rotational frequency of the fluorescence conversion section; and the preset drive frequency is equal to the rated rotational frequency of the fluorescence conversion section. The filter section has one marking point, and the fluorescence conversion section has two marking points. The control device is configured to: if the detection device detects that the frequency of identifying the marking points on the target color wheel is equal to the preset drive frequency, then determine that the target color wheel is the filter section; if the detection device detects that the frequency of identifying the marking points on the target color wheel is twice the preset drive frequency, then determine that the target color wheel is the fluorescence conversion section.

[0100] For example, assuming the rated rotational frequency of the filter is 240 Hz and the rated rotational frequency of the fluorescence conversion unit is 120 Hz, upon powering on, the digital light processing device controls both the fluorescence conversion unit and the filter unit to rotate at a frequency of 120 Hz. In this way, the detection device detects that the recognition frequency of the marking point on the fluorescence conversion unit is 240 Hz, thereby instructing the control device to isolate the fluorescence conversion unit; and the detection device detects that the recognition frequency of the marking point on the filter unit is 120 Hz, thereby instructing the control device to isolate the filter unit.

[0101] The control device is further configured to, if the target color wheel is the filter unit, send first instruction information to the digital light processing device, the first instruction information being used to instruct the digital light processing device to modify the preset drive frequency to the target drive frequency, so that the digital light processing device controls the filter unit to rotate according to the target drive frequency. The target color wheel drive frequency is twice the preset color wheel drive frequency. In this way, the filter unit can be controlled to rotate at a frequency of 240 Hz.

[0102] The control device is further configured to, if the target color wheel is the fluorescence conversion unit, send a second instruction to the digital light processing device. The second instruction instructs the digital light processing device to control the fluorescence conversion unit to rotate according to a preset drive frequency. In this way, the fluorescence conversion unit can be controlled to rotate at a frequency of 120 Hz.

[0103] In a specific implementation, as shown in FIG6 , the light source device 01 further includes a light path guiding device 400 . The light path guiding device 400 is used to guide the laser light emitted by the laser light source 100 to enter the filter portion 300 through the fluorescence conversion portion 200 .

[0104] For example, as shown in FIG7 , which is a schematic structural diagram of another light source device provided in an embodiment of the present application, a light path guiding device 400 includes: a fluorescent reflector 401 and an optical circuit unit 402 .

[0105] Here, the fluorescence reflector 401 is located between the laser light source 100 and the fluorescence conversion unit 200. The fluorescence reflector 401 is used to transmit the laser light reflected by the laser light source 100 and guide the fluorescence reflected by the fluorescence area 201 of the fluorescence conversion unit 200 to the filter area 301 of the filter unit 300. Exemplarily, the fluorescence reflector 401 is a dichroic mirror that transmits blue laser light and reflects yellow fluorescence and green fluorescence.

[0106] The optical circuit unit 402 is used to guide the laser light transmitted through the first light-transmitting region 202 of the fluorescence conversion unit 200 to the second light-transmitting region 302 of the filter unit 300 .

[0107] It should be noted that a phosphor layer and a reflective layer are provided within the fluorescent region 201 of the fluorescent conversion unit 200. Therefore, after the blue laser light emitted by the laser light source 100 passes through the fluorescent reflector 401 and irradiates the fluorescent region 201 of the fluorescent conversion unit 200, the phosphor layer on the fluorescent region 201 excites the blue laser light into fluorescent light, which is then reflected back to the fluorescent reflector 401 by the reflective layer. The fluorescent reflector 401 then reflects the fluorescent light toward the corresponding filter region 302 of the filter unit 300.

[0108] The first light-transmitting region 202 of the fluorescence conversion unit 200 lacks a phosphor layer or reflective layer and is therefore transparent. Thus, after the blue laser light emitted by the laser light source 100 passes through the fluorescence reflector 401 and strikes the first light-transmitting region 202 of the fluorescence conversion unit 200, the blue laser light passes through the first light-transmitting region 202 and out of the fluorescence conversion unit 200. Guided by the optical circuit unit 402, the blue laser light is directed toward the second light-transmitting region 302 of the filter unit 300.

[0109] In a specific implementation, as shown in FIG7 , the optical circuit unit 402 includes a first reflecting mirror 4021 , a second reflecting mirror 4022 , and a third reflecting mirror 4023 .

[0110] The first reflector 4021 is located on a side of the fluorescence conversion unit 200 facing away from the fluorescence reflector 401, and the fluorescence reflector 401, the fluorescence conversion unit 200, and the first reflector 4021 are arranged in sequence along a first direction X. The third reflector 4023 is located on a side of the fluorescence reflector 401 facing away from the filter unit 300, and the third reflector 4023, the fluorescence reflector 401, and the filter unit 300 are arranged in sequence along a second direction Y. The first reflector 4021 and the second reflector 4022 are arranged in a direction parallel to the second direction Y, and the third reflector 4023 and the second reflector 4022 are arranged in a direction parallel to the first direction X. Here, the first direction X intersects the second direction Y. For example, the first direction X is perpendicular to the second direction Y.

[0111] In this case, the blue laser light transmitted through the first light-transmitting region 202 and the fluorescence conversion unit 200 is sequentially reflected by the first reflector 4021, the second reflector 4022, and the third reflector 4023 toward the fluorescence reflector 401. Since the fluorescence reflector 401 transmits the blue laser light, the blue laser light reflected by the third reflector 403 transmits the fluorescence reflector 401 and then travels toward the second light-transmitting region 302 of the filter unit 300.

[0112] In one specific implementation, the first reflector 4021 , the second reflector 4022 , and the third reflector 4023 in the optical circuit unit 402 are all reflectors capable of reflecting any light.

[0113] In the embodiment of the present application, the light path guiding device 400 further includes a first lens assembly 403 and a second lens assembly 404. The first lens assembly 403 is located between the fluorescence reflector 401 and the fluorescence conversion unit 200, and the second lens assembly 404 is located between the fluorescence conversion unit 200 and the first reflector 4021.

[0114] Here, the first lens assembly 403 and the second lens assembly 404 include multiple convex lenses, and the first lens assembly 403 and the second lens assembly 404 are respectively arranged on both sides of the fluorescence conversion part 200, and the convex surface of each convex lens in the first lens assembly 403 is located on the side away from the fluorescence conversion part 200, and the convex surface of each convex lens in the second lens assembly 404 is located on the side away from the fluorescence conversion part 200.

[0115] The parallel light beam emitted by the laser light source 100 and passing through the fluorescence reflector 401 is focused by the first lens assembly 403 onto the fluorescence conversion unit 200. The light beam focused on the fluorescence region 201 of the fluorescence conversion unit 200 causes the phosphor layer therein to emit fluorescence. After being reflected, the fluorescence is directed to the first lens assembly 403. To this end, the first lens assembly 403 converts the fluorescence into a parallel light beam and directs it toward the fluorescence reflector 401. The light beam focused on the first light-transmitting region 202 of the fluorescence conversion unit 200, after passing through the first light-transmitting region 202, is directed to the second lens assembly 403. To this end, the second lens assembly 404 converts the laser beam into a parallel light beam, which is then guided through the optical circuit unit 402 to the filter unit 300.

[0116] In one embodiment, as shown in FIG7 , the light source device 01 further includes a converging lens 800. The converging lens 800 is located between the fluorescent reflector 401 and the filter unit 300. The converging lens 800 converges the light beam guided by the fluorescent reflector 401 so that the light beam converges onto the filter unit 300, thereby enabling the filter unit 300 to better filter the light beam.

[0117] In one embodiment, light source device 01 further includes a focusing component 900. Focusing component 900 is located between laser light source 100 and fluorescent reflector 401. Focusing component 900 includes a convex lens and a concave lens. The convex surface of the convex lens faces laser light source 100, while the concave surface of the concave lens faces laser light source 100. In this way, the laser light emitted by laser light source 100 is first focused by the convex lens and then converted into parallel light by the concave lens, thereby reducing the diameter of the laser spot emitted by laser light source 100.

[0118] Based on the above embodiments, this application also provides a laser projection device. Please refer to Figure 8, which is a schematic diagram of the structure of a laser projection device provided in an embodiment of this application. Laser projection device 00 includes: a laser projection light source 01, a light modulation component 02, and a projection lens 03. Laser projection light source 01 is the laser projection light source in the above embodiments. The specific structure, operating principle, and function of the laser projection light source have been described in detail in the aforementioned embodiment 1 and will not be repeated here.

[0119] The light modulation component 02 is located on the light-emitting side of the laser projection light source 01 and is used to modulate the light emitted by the laser projection light source 01. The projection lens 03 is located on the light-emitting side of the light modulation component 02.

[0120] It should be noted that the laser projection device 00 further includes a housing 04. FIG8 only shows a portion of the housing 04.

[0121] Exemplarily, laser projection light source 01 is configured to provide an illumination beam (also referred to as a laser beam). Light modulation component 02 is configured to modulate the illumination beam provided by laser projection light source 01 using an image signal to obtain a projection beam. Projection lens 03 is configured to project the projection beam onto a screen or wall to form a projection image. Laser projection light source 01, light modulation component 02, and projection lens 03 are assembled in housing 04. Laser projection light source 01, light modulation component 02, and projection lens 03 are connected in sequence along the direction of beam propagation.

[0122] The laser projection light source 01, light modulation assembly 02, and projection lens 03 are each enclosed by a corresponding housing. The housings of the laser projection light source 01, light modulation assembly 02, and projection lens 03 support the corresponding optical components and ensure that each optical component meets certain sealing or airtight requirements.

[0123] One end of the light modulation component 02 is connected to the projection lens 03, and the light modulation component 02 and the projection lens 03 are arranged along the emission direction (for example, parallel to the N direction) of the projection beam of the laser projection device 00. The other end of the light modulation component 02 is connected to the laser projection light source 01.

[0124] In some embodiments, the arrangement direction of the laser projection light source 01 and the light modulation assembly 02 is approximately perpendicular to the arrangement direction of the light modulation assembly 02 and the projection lens 03. That is, in the laser projection device 00, the emission direction of the projection light beam (e.g., parallel to the N direction) is approximately perpendicular to the emission direction of the illumination light beam (e.g., parallel to the M direction). This connection structure not only adapts to the optical path characteristics of the reflective light valve (described below) in the light modulation assembly 02, but also helps shorten the length of the optical path in one direction, thereby providing more space for arranging the various components of the laser projection device 00.

[0125] In an embodiment of the present application, please refer to FIG9 , which is a schematic diagram of the projection imaging optical path of a laser projection device provided in an embodiment of the present application. The illumination beam emitted by the laser projection light source 01 enters the light modulation component 02 . The laser projection light source 01 includes a laser. In some examples, the laser emits a blue laser, and the light source also includes a wavelength conversion device for receiving the blue laser excitation to generate other primary colors besides blue, which are together used to form the illumination beam. In some examples, the laser projection light source 01 includes a three-color laser for emitting a three-color laser beam, eliminating the need for a wavelength conversion device. The three-color laser has a wide color gamut and high brightness, and can provide a high-quality illumination beam.

[0126] Light modulation assembly 02 includes a first light homogenizing component 021, a reflector 022, a lens 023, a light valve 024, and a prism assembly 025. Light valve 024 is configured to modulate the incident illumination beam into a projection beam based on the image signal and direct the projection beam toward projection lens 03. First light homogenizing component 021 and light valve 024 are positioned sequentially along the propagation direction of the light beam. First light homogenizing component 021 is configured to homogenize the incident illumination beam and direct it toward light valve 024.

[0127] In some embodiments, the first light homogenizing component 021 is a light pipe. This light pipe receives the illumination beam provided by the laser projection light source 01 and homogenizes the illumination beam. In some embodiments, the light outlet of the light pipe is rectangular. This light pipe shapes the light spot of the light beam so that the shape of the light spot matches the shape of the light valve. In some embodiments, the first light homogenizing component 021 is also a fly-eye lens.

[0128] Light valve 024 is a reflective light valve. It includes multiple reflective sheets, each corresponding to a pixel in the projected image. For example, based on the image to be displayed, the reflective sheets corresponding to the pixels to be illuminated reflect a light beam toward projection lens 03. The light beam reflected toward projection lens 03 is called the projection beam. In this way, light valve 024 modulates the illumination beam to generate the projection beam, which is then used to display the image.

[0129] In some embodiments, the light valve 024 is a digital micromirror device (DMD). A DMD includes multiple (e.g., tens of thousands) of individually driven, rotating micromirrors. The micromirrors are arranged in an array. Each micromirror (e.g., each micromirror) corresponds to a pixel in the projected image to be displayed.

[0130] 9 , in some embodiments, the laser projection device 00 further includes an illumination lens assembly located between the light valve 024 and the first light homogenizing component 021 . The illumination lens assembly includes a reflector 022 , a lens 023 , and a prism assembly 025 . The light beam homogenized by the first light homogenizing component 021 passes through the illumination lens assembly and is emitted toward the light valve 024 .

[0131] The illumination beam emitted from the first light homogenizing member 021 is directed to the reflector 022, which reflects the illumination beam to the convex lens 023. The convex lens 023 converges the illumination beam to the prism assembly 025, which reflects the illumination beam to the light valve 024.

[0132] It should be noted that the above embodiments are all illustrated by taking the case where the fluorescence conversion unit and the filter in the laser projection device have different frequencies for identifying the mark. The following embodiments will also illustrate the startup of the laser projection device where the fluorescence conversion unit and the filter have the same frequency for identifying the mark.

[0133] With the development of projection technology, the application of laser projection equipment such as projectors and laser TVs is also increasing. As shown in Figure 8, after the upper shell of the laser projection equipment is disassembled, the internal structure is divided according to the optical function, including a light source device 01, a light modulation component 02 and a projection lens 03. Among them, the light source device 01 is used to provide a light source illumination beam, which is transmitted to the rear-end light modulation device and projection lens. The light source device 01 includes at least one color laser, such as a blue laser, or a two-color laser, such as a blue laser and a red laser, or a three-color laser light source, including red, green and blue lasers, for providing a three-color laser illumination beam.

[0134] The laser beam provided by light source device 01 undergoes light combining and shaping before entering the illumination path of light modulation component 02. In the digital light processing (DLP) projection architecture, the digital micro-mirror device (DMD) chip is the core light modulation component. The DMD chip receives a drive control signal corresponding to the image signal and flips the thousands of tiny mirrors on its surface to the positive or negative angle corresponding to the drive signal, reflecting the incoming light beam into projection lens 03.

[0135] The projection lens 03 is an ultra-short-throw projection lens, which is used to project an image beam onto a projection screen, thereby realizing a projection image display. The laser projection device in the above example is an ultra-short-throw laser projection device.

[0136] Because DLP utilizes DMD micro-lens reflective technology, single-, dual-, and even triple-DMD approaches all utilize a color wheel to separate and process colors. Typically, a color wheel is a combination of red, green, blue, and white (yellow) color filters. This filter separates the transmitted white (yellow) light into different colors, rotating it with a high-speed motor. This separates the different monochromatic lights sequentially along a specified optical path, which are then synthesized and projected through other optical components to create a full-color image. RGBY corresponds to red, green, blue, and yellow, respectively. The first three colors are primary colors, with yellow used for brightening.

[0137] Typically, a color wheel is a dual-color wheel, consisting of the aforementioned fluorescence conversion section and filter section. The fluorescence conversion section has yellow and green fluorescent areas, and a transparent area; the filter section has red, yellow, green, and transparent areas. A blue laser is typically used as the excitation laser, first irradiating the fluorescence conversion section to generate light (yellow, green, and blue); this light then passes through the filter section (transmitting red, yellow, green, and blue light).

[0138] A laser projection device includes a type of dual-color wheel, such as an 8-segment color wheel, or a 4-segment color wheel. Figure 10 is a schematic diagram of the structure of the fluorescence conversion part in an 8-segment color wheel provided in an embodiment of the present application. Figure 11 is a schematic diagram of the structure of the filter part in an 8-segment color wheel provided in an embodiment of the present application. As shown in Figures 10 and 11, the frequency of the 8 segments for identifying marks is 120 Hz, that is, 120 rotations per second and 7200 rotations per minute. The fluorescence conversion part of the 8-segment color wheel has 6 segments in total, namely yellow, green, transmission area, yellow, green, and transmission area (yellow is synthesized from red and yellow, and the yellow segment includes yellow and red segments). The filter part has 8 segments in total, namely red, green, blue, yellow, red, green, blue, and yellow. A color wheel including 6 segments of fluorescence conversion part and 8 segments of filter part is collectively referred to as an 8-segment color wheel.

[0139] Figure 12 is a schematic diagram of the structure of the fluorescence conversion part in a 4-segment color wheel provided in an embodiment of the present application. Figure 13 is a schematic diagram of the structure of the filter part in a 4-segment color wheel provided in an embodiment of the present application. As shown in Figures 12 and 13, the frequency of the 4 segments for identifying marks is 240 Hz, that is, 240 rotations per second and 14,400 rotations per minute. The fluorescence conversion part of the 4-segment color wheel has 3 segments in total: yellow, green, and transmission area (yellow is synthesized from red and yellow, and the yellow segment includes yellow and red segments). The filter part has 4 segments in total: red, green, blue, and yellow. A color wheel including 3 segments of fluorescence conversion part and 4 segments of filter part is collectively referred to as a 4-segment color wheel.

[0140] Exemplarily, taking a blue laser as an example, FIG14 is a schematic structural diagram of a laser projection device based on monochrome laser projection technology provided in an embodiment of the present application. As shown in FIG14 , the laser projection device includes: a display panel, a TV panel, a galvanometer, a lens, a power supply board and a laser control board, a blue laser, a color wheel (including a fluorescence conversion part and a filter part), a light sensor corresponding to the fluorescence conversion part, a light sensor corresponding to the filter part, a color wheel drive, a microcontroller unit (MCU), and an electrically erasable programmable read only memory (EEPROM), etc. Among them, the above-mentioned TV panel includes a system on chip (SOC). The above-mentioned display panel includes a projection display control processing unit, a DMD chip, etc. Among them, the projection display control processing unit includes a DLP chip, etc.

[0141] The SOC main control chip transmits image data via Vbyone. The DLP image display module converts the Vbyone signal into a High-Speed ​​Serial Interface (HSSI) signal. The DMD's electro-optical conversion module converts the electrical signal into an optical signal. The galvanometer vibrates the 60Hz signal into a 240Hz signal, which is then projected onto the screen through the lens.

[0142] The laser driver circuit (shown as the power supply board + laser control board in Figure 14) drives the blue laser to produce blue light, which is then excited by the fluorescence conversion unit to produce green and yellow light (blue light is transmitted). The green, yellow, and blue light pass through the filter unit to produce yellow, green, blue, and yellow light (yellow is filtered to red light). The first three colors are primary colors for color development; yellow is used for brightening.

[0143] Parallel flash memory stores various settings and drive data for four-segment or eight-segment color wheel models. DLP uses the duty signal to control the on / off timing of the laser drivers for the red, yellow, blue, and green (RGB) colors, corresponding to the angle and spoke of each color wheel. Spoke refers to the mixing angle between two colors.

[0144] FIG15 is a flow chart illustrating a conventional color wheel control method based on the laser projection device shown in FIG14 . As shown in FIG15 , after the laser projection device is powered on, the DLP reads the color wheel drive frequency from Flash (if the color wheel is an 8-segment color wheel, the color wheel drive frequency is 120 Hz; if the color wheel is a 4-segment color wheel, the color wheel drive frequency is 240 Hz). Based on the color wheel drive frequency, the DLP controls the color wheel drive via Serial Peripheral Interfaces (SPIs) 1 and 2, respectively, to drive the phosphor conversion unit and the filter unit.

[0145] The optical sensor detects the frequency of the marker and feeds the rotation frequency back to the DLP through the LCK1 and LCK2 signals. The MCU, EEPROM, and DLP communicate via the I2C1 bus. For example, these data modify the laser current value, color wheel model data, color wheel motor drive frequency, and control the MCU to transmit DLP PWM frequency to generate light from the laser projection device.

[0146] In existing laser projection devices, different types of color wheels require different MCUs with different control logic. However, configuring different MCU types can make on-site production (for example, requiring the production of two different main control boards) and maintenance of the laser projection device more difficult and less efficient.

[0147] Considering the aforementioned problems with existing laser projection devices, the present application proposes a laser projection device that is compatible with different types of color wheels, thereby improving the compatibility of the laser projection device's control device with different types of color wheels. With this laser projection device, even if the laser projection device is configured with different types of color wheels, only one type of control device needs to be configured for the laser projection device, thereby improving the laser projection device's compatibility with different types of color wheels, thereby reducing the difficulty of on-site production and maintenance of the laser projection device and improving the efficiency of production and maintenance of the laser projection device.

[0148] First, Figure 16 is a schematic diagram of the structure of another laser projection device provided in an embodiment of the present application. As shown in Figure 16, the laser projection device includes: a color wheel, a detection device, a digital light processing device, and a control device. The color wheel is provided with N markings. The value of N depends on the type of color wheel. For example, different types of color wheels have different numbers of markings. N is an integer greater than or equal to 1.

[0149] In one specific implementation, the color wheel is a dual-color wheel. For example, the dual-color wheel includes a first color wheel (e.g., the aforementioned filter unit) and a second color wheel (e.g., the aforementioned fluorescence conversion unit). For example, each of the first and second color wheels has N markings.

[0150] Exemplarily, the above-mentioned mark is, for example, a black color block. As a possible implementation, for any type of color wheel, taking N as an even number as an example, the N marks are symmetrical in pairs on the color wheel. Exemplarily, taking N equal to 2 and the color wheel being a two-color wheel as an example, two marks are symmetrically arranged on the first color wheel in the two-color wheel, and two marks are symmetrically arranged on the second color wheel in the two-color wheel. Alternatively, when N is an even number, the N marks are also asymmetrical on the color wheel, which is not limited by comparison in this application. As another possible implementation, N is also an odd number. Taking N equal to 1 and the color wheel being a two-color wheel as an example, one mark is arranged on the first color wheel in the two-color wheel, and one mark is arranged on the second color wheel in the two-color wheel.

[0151] The detection device is used to detect the frequency of identifying the mark based on the N marks. In a specific implementation, the detection device is any detection device such as a light sensor that can detect the rotation frequency of the color wheel based on the marks on the color wheel, which is not limited in this application.

[0152] The digital light processing device is used to control the rotation of the color wheel according to a preset color wheel driving frequency. In one specific implementation, the digital light processing device is, for example, the aforementioned DLP. It should be understood that this application does not limit the model of the DLP.

[0153] The control device is connected to the detection device and can be any device with processing function such as MCU.

[0154] It should be understood that FIG16 is merely an example of a partial structure of the laser projection device involved in this application, and is intended to serve as an illustrative illustration of the structure of the laser projection device. This application does not limit whether the laser projection device includes other components, or the connection relationships and connection methods between the components.

[0155] Based on the laser projection device shown in FIG16 , the present application further provides a color wheel control method. The execution subject of the color wheel control method includes various devices in the laser projection device, such as a control device, a digital light processing device, etc., or in other words, the execution subject of the color wheel control method is the laser projection device.

[0156] The following detailed description of the technical solution of the present application is provided in conjunction with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0157] FIG17 is a flow chart of a color wheel control method provided in an embodiment of the present application. As shown in FIG17 , the method includes the following steps:

[0158] S101 : The digital light processing device controls the color wheel to rotate according to a preset color wheel driving frequency.

[0159] In one specific implementation, the preset color wheel drive frequency is pre-stored in the digital light processing device. Alternatively, in the case where the laser projection device includes a Flash memory connected to the digital light processing device, the preset color wheel drive frequency is stored in the Flash memory. After the laser projection device is powered on, the digital light processing device reads the preset color wheel drive frequency from the Flash memory.

[0160] In one specific implementation, the digital light processing device drives the color wheel to rotate according to a preset color wheel drive frequency, for example, using a color wheel drive device such as that shown in FIG14 . It should be understood that the implementation method for the digital light processing device to control the rotation of the color wheel according to the preset color wheel drive frequency can refer to any existing method for controlling color wheel rotation, and this application will not further elaborate on this.

[0161] S102. The detection device detects the frequency of identifying the markers based on the N markers.

[0162] Exemplarily, for each rotation of the color wheel, the detection device detects N marks on the color wheel. The detection device uses the number of marks detected per second as the frequency for identifying the marks. For example, assuming that N is 2, the detection device detects 2 marks for each rotation of the color wheel. Assuming that the color wheel rotates 120 times per second, the detection device detects 240 marks per second, and the frequency for identifying the marks is determined to be 240 Hz. Assuming that N is 1, the detection device detects 1 mark for each rotation of the color wheel. Assuming that the color wheel rotates 120 times per second, the detection device detects 120 marks per second, and the frequency for identifying the marks is determined to be 120 Hz.

[0163] S103: The control device determines the type of the color wheel according to the frequency of identifying the mark detected by the detection device.

[0164] As a possible implementation, the control device may pre-store a mapping relationship between the frequency of identifying the mark and the type of the color wheel. The control device determines the type of the color wheel based on the mapping relationship and the frequency of identifying the mark detected by the detection device. For example, the mapping relationship is shown in Table 1 below:

[0165] Table 1

[0166] Taking the mapping relationship shown in Table 1 as an example, assuming that the frequency of identifying the mark detected by the detection device is frequency 1, the control device determines that the type of the color wheel is type 1 according to the mapping relationship.

[0167] S104: The control device executes the color wheel control logic corresponding to the type of the color wheel.

[0168] It should be understood that the present application does not limit the above color wheel control logic. In a specific implementation, the color wheel control logic is any existing color wheel control logic.

[0169] As one possible implementation, the control device includes a mapping relationship between a color wheel type identifier and color wheel control logic. Based on the color wheel type identifier and the mapping relationship between the color wheel type identifier and the color wheel control logic, the control device determines the color wheel control logic corresponding to the color wheel type and executes the color wheel control logic corresponding to the color wheel type.

[0170] In some embodiments, the control device further reads data corresponding to the type of color wheel required for “executing the color wheel control logic corresponding to the type of color wheel” from a storage device such as a flash or EEPROM of the laser projection device.

[0171] In some embodiments, the control device further executes other control logic corresponding to the type of the color wheel. The other control logic is a control logic for controlling components other than the color wheel in the laser projection device.

[0172] In this embodiment, the number of marks set on the color wheel is related to the type of color wheel, and the frequency of identifying the marks detected by the detection device is related to the number of marks set on the color wheel. Therefore, the control device identifies the type of the color wheel through the frequency of identifying the marks detected by the detection device, and executes the color wheel control logic corresponding to the type of color wheel. Through the above method, the control device identifies different types of color wheels and executes the color wheel control logic corresponding to the type of color wheel, thereby achieving compatibility with different types of color wheels. Through the laser projection device provided by the present application, even if the laser projection device is configured with different types of color wheels, only one type of control device needs to be configured for the laser projection device, thereby improving the compatibility of the laser projection device with the color wheel type, thereby reducing the difficulty of on-site production and maintenance of the laser projection device, and improving the efficiency of production and maintenance of the laser projection device.

[0173] Taking the example of N being an even number, the N markings being symmetrically arranged on the color wheel, and the color wheel being a dual-color wheel, as a possible implementation, the control device can also synchronously control the dual-color wheel. The dual-color wheel includes a first color wheel and a second color wheel. Both the first color wheel and the second color wheel are provided with N markings.

[0174] In this implementation, the control device further obtains a first sensing pulse signal output by the detection device "by detecting N marks on the first color wheel," and a second sensing pulse signal output by the detection device "by detecting N marks on the second color wheel." Both the first sensing pulse signal and the second sensing pulse signal are periodic pulse signals. The control device then synchronizes the first and second sensing pulse signals to synchronize the first and second color wheels.

[0175] The N marks on the first color wheel and the N marks on the second color wheel are positioned at corresponding positions on the first and second color wheels, respectively. These marks rotate with the color wheels. As previously mentioned, the first and second sensing pulse signals are both periodic pulse signals. The period of these periodic pulse signals is 1 / Nth of the rotation period of the color wheels. In other words, 1 / Nth of the period of these periodic pulse signals is synchronized with the rotation period of the color wheels. These N marks serve as reference synchronization marks for the dual-color wheel.

[0176] For example, the control device compares the difference between the rising or falling edges of the first sensing pulse signal and the second sensing pulse signal at the same time within a rotation cycle, and adjusts the frequency at which the first color wheel or the second pair of marks are recognized so that the rising or falling edges of the first sensing pulse signal and the second sensing pulse signal coincide. By synchronizing the first sensing pulse signal and the second sensing pulse signal, the first and second color wheels are indirectly synchronized.

[0177] In this embodiment, the above method can achieve the compatibility of the laser projection device with respect to color wheel types while ensuring the synchronization of the dual color wheels, thereby improving the accuracy of the laser projection device in displaying images based on the dual color wheels.

[0178] Taking the case where the color wheel is of the first type or the second type, where one mark is provided on the first type color wheel and two marks are provided on the second type color wheel as an example, the following describes in detail how the control device identifies the type of the color wheel based on the frequency of the marks detected by the detection device:

[0179] The rated rotational frequency of the first type of color wheel is twice the rated rotational frequency of the second type of color wheel. For example, the rated rotational frequency of the first type of color wheel, such as the aforementioned four-segment color wheel, is 240 Hz. Exemplarily, the rated rotational frequency of the second type of color wheel, such as the aforementioned four-segment color wheel, is 120 Hz. The aforementioned preset color wheel drive frequency is equal to the rated rotational frequency of the second type of color wheel.

[0180] As a possible implementation, if the frequency of identifying the mark detected by the detection device is equal to the preset color wheel driving frequency, it means that the detection device detects one mark per rotation of the color wheel, that is, there is one mark on the color wheel. Then, the control device determines that the type of the color wheel is the first type.

[0181] If the frequency of identifying the mark detected by the detection device is twice the preset color wheel driving frequency, it means that the detection device detects two marks per rotation of the color wheel, that is, there are two marks on the color wheel. Then the control device determines that the type of the color wheel is the second type.

[0182] Through the above method, the detection device determines the type of color wheel based on the relationship between the frequency of identifying the mark and the preset color wheel driving frequency, laying the foundation for the laser projection device to be compatible with different types of color wheels.

[0183] The following describes in detail how the control device executes the color wheel control logic corresponding to the type of color wheel:

[0184] In some embodiments, if the color wheel type is the first type, the control device sends first instruction information to the digital light processing device. The first instruction information is used to instruct the digital light processing device to modify the preset color wheel drive frequency to a target color wheel drive frequency, so that the digital light processing device controls the rotation of the color wheel according to the target color wheel drive frequency. The target color wheel drive frequency is twice the preset color wheel drive frequency. The target color wheel drive frequency is the rated rotation frequency of the first type color wheel.

[0185] If the color wheel is of the second type, in one specific implementation, the control device may not send an instruction to the digital light processing device. Alternatively, the control device sends a second instruction to the digital light processing device. The second instruction is used to instruct the digital light processing device to control the rotation of the color wheel according to a preset color wheel drive frequency. The preset color wheel drive frequency is the rated rotation frequency of the second type color wheel. Exemplarily, the control device sends the first instruction or the second instruction to the digital light processing device using different PWM signals. In other words, the first instruction and the second instruction correspond to different PWM signals.

[0186] By using the above method, the control device sends different instruction information to the digital light processing device for different types of color wheels, so that the digital light processing device drives the color wheel to rotate according to the rated rotation frequency of each type of color wheel, thereby achieving compatibility with different types of color wheels.

[0187] In some embodiments, after controlling the color wheel to rotate according to the target color wheel driving frequency or the preset color wheel driving frequency, the digital light processing device may further obtain the frequency detected by the detection device to identify the mark.

[0188] Then, the digital light processing device obtains a color wheel verification result, which is used to indicate whether the frequency used to identify the mark is the same as the target color wheel driving frequency, and sends the result to the control device.

[0189] For example, if the first type of color wheel is a 240Hz color wheel and the second type of color wheel is a 120Hz color wheel, if the color wheel is the first type, the digital light processing device controls the color wheel rotation according to a color wheel drive frequency of 240Hz. The digital light processing device then determines whether the frequency detected by the detection device for identifying the pair of marks is equal to 240Hz, obtains a color wheel verification result, and transmits it to the control device.

[0190] If the color wheel is a second type color wheel, the digital light processing device controls the color wheel to rotate according to a color wheel driving frequency of 120 Hz. Then, the digital light processing device determines whether the frequency of the pair of marks detected by the detection device is equal to 240 Hz, and obtains a color wheel verification result and sends it to the control device.

[0191] The control device also receives the color wheel calibration result. If the color wheel calibration result indicates that the frequency used to identify the mark differs from the target color wheel drive frequency, this indicates a possible color wheel anomaly, which may prevent the laser projection device from performing laser projection display. The control device may then, for example, trigger a shutdown process for the laser projection device to shut down the laser projection device. Alternatively, in some embodiments, if the color wheel calibration result indicates that the frequency used to identify the mark differs from the target color wheel drive frequency, the control device may control the laser projection device to output a prompt message, alerting the user to the abnormality of the laser projection device, etc., to enhance the user experience.

[0192] If the color wheel verification result indicates that the frequency of identifying the mark is the same as the target color wheel driving frequency, it means that the color wheel is normal. In one embodiment, the control device further controls the laser projection device to perform projection display according to any existing laser projection display mode.

[0193] Continuing with the example of the first type of color wheel being a 240Hz color wheel and the second type of color wheel being a 120Hz color wheel, assuming the color wheel is of the first type and has a single mark, if the frequency at which the mark is recognized is the same as the target color wheel drive frequency, the color wheel is rotating at the target color wheel drive frequency, indicating that there is no abnormality. If they are different, then there is an abnormality in the color wheel. Assuming the color wheel is of the second type and has two marks, if the frequency at which the mark is recognized is the same as the target color wheel drive frequency, then there is an abnormality in the color wheel.

[0194] As another possible implementation, if the color wheel type is the second type, the control device further obtains the frequency of the mark recognition detected by the detection device and transmits half the mark recognition frequency to the digital light processing device, so that the digital light processing device obtains a color wheel verification result based on the half mark recognition frequency, indicating whether the half mark recognition frequency is the same as the preset color wheel drive frequency. The digital light processing device then transmits the color wheel verification result indicating whether the half mark recognition frequency is the same as the preset color wheel drive frequency to the control device.

[0195] The control device receives the color wheel calibration result. Then, if the color wheel calibration result indicates that the half-time frequency for identifying the mark is different from the preset color wheel drive frequency, the control device triggers a shutdown process for the laser projection device. If the color wheel calibration result indicates that the half-time frequency for identifying the mark is the same as the preset color wheel drive frequency, the control device controls the laser projection device to perform projection display according to any existing laser projection display mode.

[0196] Through the above method, the laser projection device can perform self-check on whether the color wheel rotates normally, and shut down when it is determined that there is an abnormality in the color wheel, thereby avoiding damage to the laser projection device during continued operation and ensuring the safety and service life of the laser projection device components.

[0197] Taking the above-mentioned data light processing device as DLP, the control device as MCU, and the detection device as light sensor as an example, Figure 18 is a structural schematic diagram of another laser projection device provided by an embodiment of the present application. As shown in Figure 18, the light sensor corresponding to the dual color wheel is connected to the MCU, and the frequency for identifying the dual pairs of marks is transmitted through the LCK1 signal and the LCK2 signal. The MCU controls the DLP through a PWM signal. Taking the example of a 120Hz color wheel as the fluorescence conversion part and the filter part, two marks (for example, two black blocks) are provided on the back of the fluorescence conversion part and the filter part. Taking the example of a 240Hz color wheel as the fluorescence conversion part and the filter part, one mark (for example, one black block) is provided on the back of the fluorescence conversion part and the filter part.

[0198] Based on the laser projection device shown in Figure 18, Figure 19 is a flow chart of another color wheel control method provided by an embodiment of the present application. As shown in Figure 19, the DLP sends a color wheel drive of 120Hz by default. When 240Hz is detected by the MCU, the MCU recognizes an 8-segment color wheel, halves the frequency, and outputs a PWM signal representing 120Hz to the DLP (the MCU recognizes an 8-segment color wheel, and the MCU outputs a 120Hz signal). When 120Hz is detected by the MCU, the MCU recognizes a 4-segment color wheel, and the MCU outputs a 120Hz signal. At the same time, it notifies the DLP to send a 240Hz drive, and the MCU outputs a PWM signal representing 240Hz to the DLP (the MCU recognizes a 4-segment color wheel, and the MCU outputs a frequency that is not halved).

[0199] The motor drive in the parallel Flash of the DLP simultaneously sets the 120Hz and 240Hz motor drive timings; the color wheel model data simultaneously sets the 8-segment color wheel model (120Hz) and 4-segment color wheel model (240Hz) data.

[0200] As shown in Figures 18 and 19, for example, when a laser projector is powered on and an 8-segment color wheel is installed, the system first runs the 8-segment color wheel model (120Hz) according to the default 120Hz program. The MCU receives LCK1 and LCK2 signals and simultaneously detects a 240Hz LCK signal, recognizing it as an 8-segment color wheel at 120Hz. The MCU then halves the frequency (the MCU recognizes an 8-segment color wheel and halves the output frequency) and transmits a 120Hz frequency to the DLP via PWM1 and PWM2. The system then displays the image normally.

[0201] As shown in Figures 18 and 19, taking a laser projection device with a 4-segment color wheel as an example, when the device is powered on, the system first runs the 8-segment color wheel model (120Hz) according to the default 120Hz program. The MCU receives LCK1 and LCK2 and simultaneously detects the 120Hz LCK signal, recognizing it as a 4-segment color wheel at 240Hz. The MCU modifies the 4-segment color wheel model (240Hz) data and the motor 240Hz data via I2C, resetting the DLP. The DLP re-drives the color wheel according to the 4-segment color wheel model (240Hz) data. The MCU receives LCK1 and LCK12 and simultaneously detects the 240Hz LCK signal. The MCU frequency is not halved (the MCU recognizes the 4-segment color wheel and the MCU output frequency is not halved). A 240Hz frequency is transmitted to the DLP via PWM1 and PWM2, and the system produces images normally.

[0202] FIG20 is a schematic diagram of the structure of a color wheel control device provided in an embodiment of the present application. The device is used as a control device for the laser projection device described in any of the aforementioned embodiments. As shown in FIG12 , the device includes: an identification module 21 and an execution module 22.

[0203] The identification module 21 is configured to identify the type of the color wheel according to the frequency of identifying the marks detected by the detection device, wherein the frequency of identifying the marks is detected by the detection device based on the N marks.

[0204] The execution module 22 is configured to execute the color wheel control logic corresponding to the type of the color wheel.

[0205] Taking the color wheel as a dual-color wheel, the dual-color wheel includes: a first color wheel and a second color wheel, and the first color wheel and the second color wheel are both provided with the N marks as an example, in one specific implementation, the execution module 22 is further configured to obtain a first sensing pulse signal output by the detection device when detecting the N marks on the first color wheel, and a second sensing pulse signal output when detecting the N marks on the second color wheel; and synchronize the first sensing pulse signal and the second sensing pulse signal to synchronize the first color wheel and the second color wheel. The first sensing pulse signal and the second sensing pulse signal are both periodic pulse signals.

[0206] Taking the example that the type of the color wheel is the first type or the second type; the rated rotation frequency of the color wheel of the first type is twice the rated rotation frequency of the color wheel of the second type; the preset color wheel driving frequency is equal to the rated rotation frequency of the color wheel of the second type; the first type of color wheel is provided with 1 said mark, and the second type of color wheel is provided with 2 said marks, in a specific implementation, the identification module 21 is specifically used to determine that the type of the color wheel is the first type when the frequency of the identification of the mark detected by the detection device is equal to the preset color wheel driving frequency; and determine that the type of the color wheel is the second type when the frequency of the identification of the mark detected by the detection device is twice the preset color wheel driving frequency.

[0207] In one embodiment, the execution module 22 is configured to send first instruction information to the digital light processing device when the color wheel type is the first type. The first instruction information is configured to instruct the digital light processing device to modify the preset color wheel drive frequency to a target color wheel drive frequency, so that the digital light processing device controls the rotation of the color wheel according to the target color wheel drive frequency; the target color wheel drive frequency is twice the preset color wheel drive frequency.

[0208] If the type of the color wheel is the second type, in a specific implementation, the execution module 22 is also used to obtain the frequency of identifying the mark detected by the detection device; send 1 / 2 times the frequency of identifying the mark to the digital light processing device, so that the digital light processing device obtains a color wheel verification result for indicating whether the 1 / 2 times frequency of identifying the mark is the same as the preset color wheel driving frequency based on the 1 / 2 times frequency of identifying the mark; receive the color wheel verification result; and trigger the shutdown process of the laser projection device when the color wheel verification result is used to indicate that the 1 / 2 times frequency of identifying the mark is different from the preset color wheel driving frequency.

[0209] The color wheel control device provided in the embodiment of the present application executes the color wheel control method in the above method embodiment, and its implementation principle and technical effects are similar, which will not be repeated here.

[0210] The present application also provides a computer-readable storage medium, which includes: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media for storing program codes. Specifically, the computer-readable storage medium stores program instructions, and the program instructions are used for the methods in the above embodiments.

[0211] The present application also provides a program product, comprising execution instructions stored in a readable storage medium. At least one control module of a display device reads the execution instructions from the readable storage medium, and at least one control module executes the execution instructions to cause the display device to implement the color wheel control methods provided in the various embodiments described above.

[0212] Finally, it should be noted that 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 aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0213] For ease of explanation, the above description has been made with reference to specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations are possible. The above embodiments are selected and described to better explain the principles and practical applications, so that those skilled in the art can better utilize the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A light source device, characterized in that: It includes: a laser light source, a fluorescence conversion unit and a filter unit; The fluorescence conversion part is located on the output light path of the laser light source, and the fluorescence conversion part includes a plurality of first areas arranged along a circumferential direction; The filter section is located on the output light path of the fluorescence conversion section, the filter section includes a plurality of second regions arranged along a circumferential direction, and the plurality of first regions are distributed correspondingly to the plurality of second regions; The rotation speed of the filter unit is m times the rotation speed of the fluorescence conversion unit, the number of the second regions is 1 / m of the number of the first regions, and m is a positive rational number greater than 1.

2. The light source device according to claim 1, characterized in that: The central angle of each second area is m times the central angle of the corresponding first area.

3. The light source device according to claim 1, characterized in that: The plurality of first regions are divided into a plurality of region groups, each of the region groups includes at least two first regions, and the plurality of region groups correspond one-to-one to the plurality of second regions; The colors of the light rays emitted from each first region in the same region group are the same; and the light rays emitted from each first region in the same region group can all be emitted to the corresponding second region.

4. The light source device according to claim 3, characterized in that: The sum of the central angles of the first regions in the same region group is equal to the central angle of the corresponding second region.

5. The light source device according to claim 3, characterized in that: The number of the first regions included in each of the region groups is two, the two first regions in the same region group are arranged opposite to each other, and the central angles of the two first regions in the same region group are the same.

6. The light source device according to claim 5, characterized in that: The rotation speed of the filter section is twice that of the fluorescence conversion section.

7. The light source device according to claim 3, characterized in that: Any two adjacent first regions in the circumferential direction belong to two different region groups.

8. The light source device according to claim 7, characterized in that: At least two first regions that are continuously arranged in the circumferential direction and belong to different region groups are used to form a group of periodically arranged regions, and the same group of periodically arranged regions includes: at least one fluorescent region and one first light-transmitting region; The plurality of second regions include: at least one light filtering region and a second light transmitting region; The at least one fluorescent area corresponds to the at least one filter area one by one, and the first light-transmitting area corresponds to the second light-transmitting area.

9. The light source device according to claim 8, characterized in that: The laser light source is used to emit blue laser; The at least one fluorescent area includes: a yellow fluorescent area and a green fluorescent area; The at least one filter region includes: a red filter region and a green filter region; The yellow fluorescent area corresponds to the red filter area, and the color filter fluorescent area corresponds to the green filter area.

10. The light source device according to claim 8, characterized in that: The light source device further includes: a light path guiding device, which is used to guide the laser light emitted by the laser light source to enter the filter portion via the fluorescence conversion portion.

11. The light source device according to claim 10, characterized in that: The optical path guiding device comprises: a fluorescent reflector and an optical circuit unit; The fluorescence reflector is located between the laser light source and the fluorescence conversion unit, and is used to transmit the laser light emitted by the laser light source and guide the fluorescence reflected by the fluorescence area of ​​the fluorescence conversion unit to the filter area of ​​the filter unit; The optical circuit unit is used to guide the laser light transmitted through the first light-transmitting area of ​​the fluorescence conversion part to the second light-transmitting area of ​​the filter part.

12. The light source device according to claim 11, characterized in that: The optical circuit unit comprises: a first reflector, a second reflector and a third reflector; The first reflector is located at a side of the fluorescence conversion portion away from the fluorescence reflector, and the fluorescence reflector, the fluorescence conversion portion and the first reflector are arranged in sequence along a first direction; The third reflector is located at a side of the fluorescent reflector away from the filter portion, and the third reflector, the fluorescent reflector and the filter portion are arranged in sequence along the second direction; The arrangement direction of the first reflector and the second reflector is parallel to the second direction, and the arrangement direction of the third reflector and the second reflector is parallel to the first direction; The first direction intersects with the second direction.

13. The light source device according to claim 11, characterized in that: The light source device further comprises: a light homogenizing component, which is arranged on the output light path of the filter part and is used to receive the color light output after being filtered by the filter part.

14. The light source device according to any one of claims 1 to 13, characterized in that: The fluorescence conversion part has a first marking point, and the filter part has a second marking point; Wherein, during the rotation of the fluorescence conversion part and the filter part, the first marking point and the second marking point can overlap multiple times on the optical path of the light source device, and in the process from the previous overlap to the next overlap, the number of rotations of the filter part is m times the number of rotations of the fluorescence conversion part.

15. The light source device according to any one of claims 1 to 13, characterized in that: The fluorescence conversion part and the filter part both have marking points, and the number of marking points provided on the fluorescence conversion part is different from the number of marking points provided on the filter part; The light source device further comprises: a digital light processing device, a detection device and a control device, wherein the control device is connected to the digital light processing device and the detection device respectively; The digital light processing device is configured to: control a target color wheel to rotate according to a preset driving frequency, wherein the target color wheel is the fluorescence conversion part or the filter part; The detection device is configured to: detect the frequency of identifying the marking point based on the marking point on the target color wheel; The control device is configured to determine the type of the target color wheel according to the frequency of identifying the marking points on the target color wheel, and send instruction information to the digital light processing device to make the target color wheel rotate according to the corresponding rated rotation frequency.

16. The light source device according to claim 15, characterized in that: The rated rotation frequency of the filter section is twice the rated rotation frequency of the fluorescence conversion section; the preset driving frequency is equal to the rated rotation frequency of the fluorescence conversion section; the filter section has one marking point, and the fluorescence conversion section has two marking points; the control device is configured as follows: If the detection device detects that the frequency of identifying the marking point on the target color wheel is equal to the preset driving frequency, then determining that the target color wheel is the filter part; If the detection device detects that the frequency of identifying the marking points on the target color wheel is twice the preset driving frequency, it is determined that the target color wheel is the fluorescence conversion part.

17. The light source device according to claim 16, characterized in that: The control device is configured to: If the target color wheel is the filter part, a first indication message is sent to the digital light processing device, wherein the first indication message is used to instruct the digital light processing device to modify the preset driving frequency to the target driving frequency, so that the digital light processing device controls the filter part to rotate according to the target driving frequency; the target color wheel driving frequency is twice the preset color wheel driving frequency.

18. The light source device according to claim 16, characterized in that: The control device is also configured to: If the target color wheel is the fluorescence conversion part, second instruction information is sent to the digital light processing device, where the second instruction information is used to instruct the digital light processing device to control the fluorescence conversion part to rotate according to the preset driving frequency.

19. The light source device according to any one of claims 1 to 13, characterized in that: The light source device further comprises: a first driving motor and a second driving motor; The first driving motor is connected to the fluorescence conversion part and is used to drive the fluorescence conversion part to rotate; The second driving motor is connected to the light filtering part and is used to drive the light filtering part to rotate; Wherein, when the rotation speed of the filter unit is twice the rotation speed of the fluorescence conversion unit, the output frequency of the first driving motor is 120 Hz, and the output frequency of the second driving motor is 240 Hz.

20. A laser projection device, characterized in that: Comprising the laser projection light source as claimed in any one of claims 1 to 19, as well as a light modulation component and a projection lens; The light modulation component is located at the light output side of the laser projection light source, and the light modulation component is used to modulate the light emitted by the laser projection light source; The projection lens is located at the light-emitting side of the light modulation component.

Images