Illumination system and projection device

Abstract

The invention provides a lighting system mixing three-color pure laser and fluorescent powder and a projection device applying the lighting system. The lighting system is favorable for improving the phenomenon of laser speckles and comprises a laser light source module, a wavelength conversion piece, a partition dichroic mirror and a light equalizing assembly. The laser light source module is used for providing blue, green and red laser beams. The wavelength conversion piece is located on a transmission path of the three-color laser beam, and the wavelength conversion piece is used for reflecting the three-color laser beam and converting the blue laser beam into an excited laser beam. The partition dichroic mirror is located on a transmission path of the three-color laser beam and the excited light beam and is used for reflecting at least one part of the three-color laser beam and the excited light beam from the wavelength conversion piece. The light uniformizing assembly is located on a transmission path of at least one part of the three-color laser beam and the excited light beam and used for receiving and uniformizing at least one part of the three-color laser beam and the excited light beam from the partition dichroic mirror so as to provide an illumination beam.

Description

TECHNICAL FIELD

[0001] The present application relates to an illumination system and a projection device, in particular, to an illumination system and a projection device comprising the illumination system. BACKGROUND

[0002] The existing laser projector contains various illumination systems. The light source of the illumination system can be divided into the following three types: providing pure laser beam for irradiation, using laser to excite fluorescent powder for illumination, or directly using light emitting diode as light source. However, the above-mentioned methods all have corresponding disadvantages. For example, using three-color pure laser beam will produce speckle and the brightness will be limited by the size of the package, which makes it difficult to provide a better light source effect.

[0003] The background section of this document is included in advance to assist the understanding of the present application, therefore, the contents disclosed in the background section can include some known technologies to those skilled in the art. The contents disclosed in the background section do not represent the known technologies known to those skilled in the art before the present application, or the problems to be solved by one or more embodiments of the present application. SUMMARY

[0004] The present application provides an illumination system, which is beneficial to improve the disadvantage of laser speckle, so as to provide a good illumination effect.

[0005] The present application also provides a projection device comprising the above-mentioned illumination system, which has a good illumination effect.

[0006] Other purposes and advantages of the present application can be further understood from the technical features disclosed in the present application.

[0007] To achieve one or some or all of the above-mentioned objects, an embodiment of the present application provides a lighting system, comprising: a laser light source module configured to provide a blue laser beam, a green laser beam and a red laser beam; a wavelength conversion member located on a transmission path of the red laser beam, the green laser beam and the blue laser beam, the wavelength conversion member configured to reflect the red laser beam, the green laser beam and the blue laser beam, and the wavelength conversion member adapted to convert the blue laser beam to generate a stimulated light beam; a partition dichroic mirror located on the transmission path of the red laser beam, the green laser beam, the blue laser beam and the stimulated light beam, and located between the laser light source module and the wavelength conversion member, the partition dichroic mirror configured to reflect at least part of the red laser beam, the green laser beam, the blue laser beam and the stimulated light beam from the wavelength conversion member; and a homogenizing assembly located on the transmission path of at least part of the red laser beam, the green laser beam, the blue laser beam and the stimulated light beam, configured to receive and homogenize at least part of the red laser beam, the green laser beam, the blue laser beam and the stimulated light beam from the partition dichroic mirror to provide a lighting beam.

[0008] To achieve one or some or all of the above-mentioned objects, an embodiment of the present application provides a projection device, comprising the lighting system as described above, configured to provide the lighting beam; a light modulation system located on the transmission path of the lighting beam, configured to convert the lighting beam into an image beam; and a projection lens located on the transmission path of the image beam, configured to project the image beam out of the projection device.

[0009] Based on the above, an embodiment of the present application has at least one of the following advantages or effects. In the design of the lighting system of the present application, the laser light source module provides three-color laser beams, the three-color laser beams are first directly irradiated on the wavelength conversion member through the partition dichroic mirror, the wavelength conversion member has fluorescent powder, the three-color laser beams are reflected back to the partition dichroic mirror through the wavelength conversion member, and then reflected to the homogenizing assembly through the partition dichroic mirror to provide the lighting beam, so as to improve the disadvantage of laser speckle and provide good lighting effect. In addition, the projection device using the lighting system of the present application can have good lighting projection effect. BRIEF DESCRIPTION OF DRAWINGS

[0010] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and serve to explain the present application. In the drawings:

[0011] Figure 1 is a block diagram of a projection device according to an embodiment of the present application;

[0012] Figure 2 is a schematic diagram of a lighting system according to an embodiment of the present application;

[0013] Figure 3 is a wavelength diagram of a first region of a partitioned dichroic mirror according to an embodiment of the present application;

[0014] Figure 4 is a wavelength diagram of a second region of a partitioned dichroic mirror according to an embodiment of the present application;

[0015] Figure 5 is a schematic diagram of a wavelength conversion piece according to an embodiment of the present application;

[0016] Figure 6 is a schematic diagram of a wavelength conversion piece according to another embodiment of the present application;

[0017] Figure 7 is a projected front view of a wavelength conversion piece according to an embodiment of the present application;

[0018] Figure 8 is a projected front view of a wavelength conversion piece according to another embodiment of the present application;

[0019] Figure 9 is a schematic diagram of a laser light source module providing light beams in various time sequences according to an embodiment of the present application;

[0020] Figure 10 is a light path schematic diagram of a first time sequence of an illumination system according to an embodiment of the present application;

[0021] Figure 11 is a light path schematic diagram of a second time sequence of an illumination system according to an embodiment of the present application;

[0022] Figure 12 is a light path schematic diagram of a third time sequence of an illumination system according to an embodiment of the present application;

[0023] Figure 13 is a light path schematic diagram of a blue laser light beam of a fourth time sequence of an illumination system according to an embodiment of the present application;

[0024] Figure 14 is a light path schematic diagram of a green laser light beam of a fourth time sequence of an illumination system according to an embodiment of the present application;

[0025] Figure 15 is a light path schematic diagram of a red laser light beam of a fourth time sequence of an illumination system according to an embodiment of the present application;

[0026] Figure 16 is a schematic diagram of an arrangement of laser light emitting pieces in a laser light source module according to an embodiment of the present application;

[0027] Figure 17This is a schematic diagram of the arrangement of laser light-emitting elements in a laser light source module according to another embodiment of the present invention;

[0028] Figure 18 This is a schematic diagram of a lighting system according to an embodiment of the present invention;

[0029] Figure 19A This is a schematic diagram of a lighting system according to another embodiment of the present invention;

[0030] Figure 19B This is a schematic diagram of a lighting system according to another embodiment of the present invention;

[0031] Figure 20 This is a schematic diagram of a lighting system according to an embodiment of the present invention;

[0032] Figure 21 yes Figure 20 A schematic diagram of the wavelength of the first region of the colorimetric mirror;

[0033] Figure 22 This is a schematic diagram of the optical path of a blue laser beam in a lighting system according to an embodiment of the present invention;

[0034] Figure 23 yes Figure 22 A schematic diagram of the wavelength of the beam splitter; and

[0035] Figure 24 yes Figure 22 A schematic diagram of the optical path of the green laser beam in the lighting system. Detailed Implementation

[0036] The foregoing descriptions and other technical contents, features, and effects of this invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms used in the following embodiments, such as up, down, left, right, front, or back, are merely for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

[0037] Please see Figure 1 and Figure 2 , Figure 1 A block diagram of a projection device according to an embodiment of the present invention and Figure 2A schematic diagram of an illumination system. As shown in the figure, this embodiment provides an illumination system 1, which includes a laser source module 11, a wavelength conversion element 12, a dichroic mirror 13, and a light homogenizing component 14. The laser source module 11 provides a blue laser beam BL, a green laser beam GL, and a red laser beam RL. The wavelength conversion element 12 is located in the transmission path of the red laser beam RL, the green laser beam GL, and the blue laser beam BL. The wavelength conversion element 12 is used to reflect the red laser beam RL, the green laser beam GL, and the blue laser beam BL, and is adapted to convert the blue laser beam BL to generate an excited beam SL. The dichroic mirror 13 is located in the transmission path of the red laser beam RL, the green laser beam GL, the blue laser beam BL, and the excited beam SL, and is located between the laser source module 11 and the wavelength conversion element 12. The dichroic mirror 13 is used to reflect at least a portion of the red laser beam RL, the green laser beam GL, the blue laser beam BL, and the excited beam SL from the wavelength conversion element 12. The homogenizing component 14 is located on the transmission path of at least a portion of the red laser beam RL, green laser beam GL, blue laser beam BL and excited beam SL, and is used to receive and homogenize at least a portion of the red laser beam RL, green laser beam GL, blue laser beam BL and excited beam SL from the dichroic mirror 13 to provide an illumination beam.

[0038] The laser source module 11 includes at least one red laser emitter 11R providing a red laser beam RL, at least one green laser emitter 11G providing a green laser beam GL, and at least one blue laser emitter 11B providing a blue laser beam BL. The red laser emitter 11R, green laser emitter 11G, and blue laser emitter 11B are, for example, laser diodes (LDs), and when there are multiple laser diodes, they can be arranged in a matrix. In this embodiment, the center wavelength of the red laser beam RL is 635 nm or more, the center wavelength of the green laser beam GL is between 515 nm and 530 nm, and the center wavelength of the blue laser beam BL is 465 nm or less. Since the laser emitters provide narrow wavelength beams, in this embodiment, the red laser beam RL, green laser beam GL, and blue laser beam BL are combined with the excited beam SL, so that the excited beam SL fills in the wavelength range lacking in the red laser beam RL, green laser beam GL, or blue laser beam BL among the three primary colors, thereby improving the shortcomings of laser speckle and providing a good illumination source.

[0039] Please refer to the following: Figure 2 , Figure 3 and Figure 4 , Figure 3This is a schematic diagram of the wavelength of the first region of a dichroic mirror according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the wavelength in the second region of a dichroic mirror. For example... Figure 2 As shown, in this embodiment, the color-separating mirror 13 includes a first region 13A and a second region 13B. The first region 13A is adjacent to the second region 13B. The first region 13A is located in the transmission path of the green laser beam GL and the blue laser beam BL from the laser source module 11, but is not located in the transmission path of the red laser beam RL from the laser source module 11. The first region 13A is used to allow the green laser beam GL and the blue laser beam BL from the laser source module 11 to pass through, and to reflect at least a portion of the red laser beam RL and the excited beam SL from the wavelength conversion element 12. The second region 13B is located in the transmission path of the red laser beam RL from the laser source module 11, and is not located in the transmission path of the green laser beam GL and the blue laser beam BL from the laser source module 11. The second region 13B is used to allow the red laser beam RL from the laser source module 11 to pass through, and to reflect at least a portion of the green laser beam GL, the blue laser beam BL, and the excited beam SL from the wavelength conversion element 11.

[0040] As mentioned above, Figure 3 As shown, the first region 13A is a bandpass filter, and the transmission wavelength range of the first region 13A is between 400nm and 480nm and between 510nm and 540nm. Figure 4As shown, the second region 13B is a high-pass filter, and the transmission wavelength range of the second region 13B is between 610nm and 660nm. In this embodiment, when the red laser beam RL from the laser source module 11 passes through the second region 13B, at least a portion of the wavelength range of the red laser beam RL needs to fall within the range of 610nm to 660nm. When the green laser beam GL and the blue laser beam BL from the laser source module 11 pass through the first region 13A, at least a portion of the wavelength range of the green laser beam GL needs to fall within the range of 510nm to 540nm, and at least a portion of the wavelength range of the blue laser beam BL needs to fall within the range of 400nm to 480nm. That is, the wavelength range of the red laser beam RL at least partially overlaps with the transmission wavelength range of the second region 13B, and the wavelength ranges of the green laser beam GL and the blue laser beam BL each at least partially overlap with the transmission wavelength range of the first region 13A. Furthermore, the excited beam SL generated by the wavelength conversion element 12 has a wide wavelength range. Therefore, when the excited beam SL enters the first region 13A and the second region 13B of the dichroic mirror 13, although some wavelengths of the excited beam SL will penetrate the dichroic mirror 13, a portion of the excited beam SL will still be reflected by the dichroic mirror 13 and transmitted to the light-diffusing component 14. In addition, the incident surface of the dichroic mirror 13 relative to the wavelength conversion element 12 is inclined. In one embodiment, the angle α between the dichroic mirror 13 and the incident surface of the wavelength conversion element 12 is 45 degrees, but it is not limited to this.

[0041] In this embodiment, the lighting system 1 further includes a lens assembly 15, which is located between the wavelength conversion element 12 and the dichroic mirror 13. The lens assembly 15 is used to focus the red laser beam RL, the green laser beam GL and the blue laser beam BL from the dichroic mirror 13 onto the wavelength conversion element 12.

[0042] Please refer to the following: Figure 5 and Figure 6 This is a schematic diagram of a wavelength conversion device according to an embodiment of the present invention. Figure 6 This is a schematic diagram of another embodiment of the wavelength conversion device. (As shown) Figure 5 and Figure 6As shown, the wavelength conversion device 12 includes a first layer 121, a second layer 122, and a reflective substrate 123 stacked sequentially. The first layer 121 is disposed facing the color separation mirror 13. The wavelength conversion device 12 includes a red light region 12R, a green light region 12G, and a blue light region 12B. The red light region 12R, the green light region 12G, and the blue light region 12B are used to enter the light transmission path at different times. The first layer 121 corresponding to the red light region 12R is a red light reflective layer 121R, and the second layer 122 corresponding to the red light region 12R is a first phosphor layer 122R. The first layer 121 corresponding to the green light region 12G is a green light reflective layer 121G, and the second layer 122 corresponding to the green light region 12G is a second phosphor layer 122G. Please refer to [reference needed]. Figure 5 In this embodiment, the first layer 121 of the blue light region 12B is an anti-reflection layer 121B, and the second layer 122 of the blue light region 12B is a reflective layer 122B or a blue light reflective layer. In other embodiments, the blue light region 12B may not have a first layer 121. Please refer to [reference needed]. Figure 6 In another embodiment, the blue light region 12B may not have both the first and second layers, and any laser beam irradiating the blue light region 12B will be reflected by the reflective substrate 123. In one embodiment, the wavelength range reflected by the red light reflective layer 121R is the same as the transmission wavelength range of the second region 13B of the colorimetric mirror 13 (e.g., between 610 nm and 660 nm), while the wavelength range reflected by the green light reflective layer 121G is the same as the transmission wavelength range of the corresponding green light in the first region 13A of the colorimetric mirror 13 (e.g., between 510 nm and 540 nm).

[0043] In this embodiment, both the first phosphor layer 122R and the second phosphor layer 122G are phosphors used to convert the excited light beam SL into a yellow light. The excited light beam SL, converted by the phosphor, covers a relatively wide wavelength range. The excited light beam SL can supplement the wavelength range lacking in narrow-band red laser beams RL, GL, or BL, thus supplementing the color of the red laser beam RL, green laser beam GL, and blue laser beam BL. The color of the phosphor can be adjusted according to the user's needs; that is, the phosphors in the first phosphor layer 122R and the second phosphor layer 122G can be of the same color or different colors. In one embodiment, the first phosphor layer 122R can be a phosphor used to convert the excited light beam into a red or orange light, and the second phosphor layer 122G can be a phosphor used to convert the excited light beam into a green light, but it is not limited to these embodiments.

[0044] In one embodiment, the wavelength conversion element 12 further includes a yellow light region 12Y. The red light region 12R, green light region 12G, blue light region 12B, and yellow light region 12Y are used to enter the light transmission path at different times. The first layer 121 corresponding to the yellow light region 12Y is an anti-reflection layer 121Y, and the second layer 122 corresponding to the yellow light region 12Y is a third phosphor layer 122Y. The third phosphor layer 122Y is a phosphor used to convert the excited light beam into a yellow color. The yellow light region 12Y can be used as supplementary lighting, enabling the illumination system 1 to provide a good illumination beam.

[0045] Please refer to the following: Figure 7 and Figure 8 , Figure 7 This is a projected front view of a wavelength conversion element according to an embodiment of the present invention and Figure 8 This is a projected front view of a wavelength conversion element according to another embodiment. (See image below.) Figure 7 As shown, in one embodiment, the red light region 12R, green light region 12G, blue light region 12B, and yellow light region 12Y of the wavelength conversion element 12 can be equally divided, that is, the red light region 12R, green light region 12G, blue light region 12B, and yellow light region 12Y each occupy one-quarter. Figure 8 As shown, in another embodiment, the proportions of the red light region 12R, green light region 12G, blue light region 12B, and yellow light region 12Y of the wavelength conversion element 12 can be adjusted according to the user's needs. For example, the red light region 12R accounts for 25% of the total, the green light region 12G accounts for 30%, the blue light region 12B accounts for 20%, and the yellow light region accounts for 25%. Different lighting variations can be presented in this manner. In one embodiment, the first layer 121 and the second layer 122 of the wavelength conversion element 12 form a C-shaped structure. In other words, the blue light region 12B does not have any stacked layer structure, and the light beam entering the blue light region is mainly reflected by the reflective substrate 123 (e.g., Figure 6 (As shown). Additionally, with Figure 5 As shown in the stacked structure, a projected front view of an embodiment will present a ring structure, that is, an anti-reflective layer 121B and a reflective layer 122B will be stacked on the blue light area 12B, filling the original C-shaped structure into a ring structure. Furthermore, the sizes of the first layer 121 and the second layer 122 corresponding to each area can be the same or different. For example, when the sizes of the first layer 121 and the second layer 122 in the same area are the same, the orthographic projections of the first layer 121 and the second layer 122 will be exactly the same and overlap. When the sizes of the first layer 121 and the second layer 122 in the same area are different (e.g....), the projections will be completely identical and overlapping. Figure 8 As shown in the figure, the first layer 121 is smaller than the second layer 122. At this time, the orthographic projection of the first layer 121 will completely overlap with a part of the orthographic projection of the second layer 122.

[0046] Please refer to the following: Figure 9 and Figure 10 ,Figure 9 This is a schematic diagram of a laser source module providing a beam at various timings according to an embodiment of the present invention. Figure 10 This is a schematic diagram of the optical path of a lighting system according to an embodiment of the present invention, showing the first timing sequence. In the first timing sequence (i.e., the red light timing sequence R), the blue laser emitter 11B and the red laser emitter 11R of the laser source module 11 are turned on to provide a blue laser beam BL (represented by a two-dot chain line in the diagram) and a red laser beam RL (represented by a solid line in the diagram), respectively. At this time, the laser source module 11 does not provide a green laser beam GL, and the red light region 12R of the wavelength conversion element 12 enters the light transmission path. A blue laser beam BL from the laser light source module 11 passes through the first region 13A of the dividing dichroic mirror 13 and is incident on the red light region 12R of the wavelength conversion component 12. The blue laser beam BL penetrates the red light reflective layer 121R of the first layer 121 and generates an excited beam SL in the first phosphor layer 122R of the second layer 122 (all figures are shown in dashed lines). The excited beam SL is reflected back to the red light reflective layer 121R of the first layer 121 by the reflective substrate 123. The first part of the excited beam SL will penetrate the red light reflective layer 121R and be transmitted to the dividing dichroic mirror 13, and then to the light homogenizing component 14 to provide an illumination beam. In detail, when the stimulated light beam SL is reflected by the reflective substrate 123 and returns to the red light reflective layer 121R of the first layer 121, a portion of the stimulated light beam SL will be blocked by the red light reflective layer 121R. That is, wavelengths of the stimulated light beam SL that fall within the wavelength range reflected by the red light reflective layer 121R (e.g., between 610nm and 660nm) will be blocked by the red light reflective layer 121R and cannot penetrate. The other portion of the stimulated light beam SL can penetrate the red light reflective layer 121R. That is, wavelengths of the stimulated light beam SL that do not fall within the wavelength range reflected by the red light reflective layer 121R can penetrate out of the red light reflective layer 121R. In other words, the stimulated light beam SL that penetrates the red light reflective layer 121R is the first portion of the stimulated light beam SL. Meanwhile, the red laser beam RL from the laser light source module 11 passes through the second region 13B of the dividing color filter 13 and is incident on the red light region 12R of the wavelength conversion component 12. The red laser beam RL is reflected by the red light reflective layer 121R of the first layer 121 and transmitted to the first region 13A of the dividing color filter 13, and then transmitted to the light homogenizing component 14 to provide an illumination beam.

[0047] As described above, the excited beam SL is excited by phosphor and has a relatively wide beam width. Therefore, the excited beam SL that penetrates the first part of the red light reflecting layer 121R can simultaneously cover both the first region 13A and the second region 13B of the dichroic mirror 13. Most of the excited beam SL in the first part is reflected by both the first region 13A and the second region 13B of the dichroic mirror 13. For the first region 13A of the dichroic mirror 13, the wavelengths of the excited beam SL that fall within the transmission wavelength range of the first region 13A (e.g., between 400nm and 480nm and between 510nm and 540nm) will penetrate out of the first region 13A of the dichroic mirror 13, while the remaining portion will be reflected by the first region 13A and transmitted to the light-diffusing component 14. For the second region 13B of the colorimetric mirror 13, wavelengths of the excited light beam SL entering the first part of the second region 13B that fall within the transmission wavelength range of the second region 13B (e.g., between 610nm and 660nm) will pass through the second region 13B of the colorimetric mirror 13, while the remaining portion will be reflected by the second region 13B. If the wavelength range reflected by the red light reflecting layer 121R is the same as the transmission wavelength range of the second region 13B of the colorimetric mirror 13, then the entire excited light beam SL entering the first part of the second region 13B will be reflected to the light-diffusing component 14.

[0048] Please refer to the following: Figure 11 , Figure 11This is a schematic diagram of the optical path of a lighting system according to an embodiment of the present invention, showing the second timing sequence. In the second timing sequence (i.e., the green light timing sequence G), the blue laser emitter 11B and the green laser emitter 11G of the laser source module 11 are turned on to provide a blue laser beam BL and a green laser beam GL, respectively (represented by a dotted chain line in the diagram). At this time, the laser source module 11 does not provide a red laser beam RL, and the green light region 12G of the wavelength conversion element 13 enters the light transmission path. Blue laser beam BL and green laser beam GL from laser light source module 11 pass through the first region 13A of the dividing dichroic mirror 13 and are incident on the green light region 12G of wavelength conversion component 12. The blue laser beam BL penetrates the green light reflective layer 121G of the first layer 121 and generates an excited beam SL in the second phosphor layer 122G of the second layer 122. The excited beam SL is reflected back to the green light reflective layer 121G of the first layer 121 by the reflective substrate 123. The second part of the excited beam SL will penetrate the green light reflective layer 121G and be transmitted to the dividing dichroic mirror 13, and then to the light homogenizing component 14 to provide an illumination beam. In detail, when the stimulated light beam SL is reflected back to the green light reflective layer 121G of the first layer 121 by the reflective substrate 123, a portion of the stimulated light beam SL will be blocked by the green light reflective layer 121G. That is, the wavelength range of the stimulated light beam SL that falls within the wavelength range reflected by the green light reflective layer 121G (for example, between 510nm and 540nm) will be blocked by the green light reflective layer 121G and cannot penetrate out. The other portion of the stimulated light beam SL can penetrate the green light reflective layer 121G. That is, the wavelength range of the stimulated light beam SL that does not fall within the wavelength range reflected by the green light reflective layer 121G can penetrate out of the green light reflective layer 121G. In other words, the stimulated light beam SL that penetrates the green light reflective layer 121G is the second portion of the stimulated light beam SL. Meanwhile, the green laser beam GL from the dividing color mirror 13 is reflected by the green light reflective layer 121G of the first layer 121 and transmitted to the second region 122 of the dividing color mirror 12, and then to the light homogenizing component 14 to provide an illumination beam.

[0049] Furthermore, the stimulated light beam SL, which penetrates the second part of the green light reflective layer 121G, illuminates the dividing dichroic mirror 13. The reflection of the stimulated light beam SL from the second part by the dividing dichroic mirror 13 is similar to that of the stimulated light beam SL from the first part. Therefore, further details are omitted.

[0050] Please refer to the following: Figure 12 , Figure 12This is a schematic diagram of the optical path of a lighting system according to an embodiment of the present invention, in the third timing sequence. In the third timing sequence (i.e., blue light timing sequence B), the blue laser emitter 11B of the laser source module 11 is turned on to provide a blue laser beam BL. At this time, the laser source module 11 does not provide a red laser beam RL or a green laser beam GL, and the blue light region 12B of the wavelength conversion unit 12 enters the light transmission path. The blue laser beam BL from the laser source module 11 passes through the first region 13A of the dichroic mirror 13 and is incident on the blue light region 12B of the wavelength conversion unit 12. The blue laser beam BL is reflected by the blue light region 12B to the second region 13B of the dichroic mirror 13 and is transmitted to the light homogenizing component 14 to provide an illumination beam.

[0051] Please refer to the following: Figure 13 , Figure 13 This is a schematic diagram of the optical path of a blue laser beam in the fourth timing of an illumination system according to an embodiment of the present invention. In the fourth timing (i.e., the yellow light timing Y), the blue laser emitter 11B of the laser source module 11 is turned on to provide a blue laser beam BL. At this time, the yellow light region 12Y of the wavelength conversion element 12 enters the light transmission path. The blue laser beam BL from the laser source module 11 passes through the first region 13A of the dichroic mirror 13 and is incident on the yellow light region 12Y of the wavelength conversion element 12. The blue laser beam BL penetrates the anti-reflection layer 121Y of the first layer 121 and generates an excited beam SL in the third phosphor layer 122Y of the second layer 122. The excited beam SL is reflected by the reflective substrate 123 to the dichroic mirror 13. As mentioned above, most of the excited beam SL entering the dichroic mirror 13 can be reflected by the dichroic mirror 13 and transmitted to the light-diffusing component 14 to provide an illumination beam. This embodiment can mainly be used to supplement the laser beams of red laser beam RL, green laser beam GL and blue laser beam BL. The yellow light area 12Y can be set according to actual needs and is not limited thereto.

[0052] Please refer to the following: Figure 14 and Figure 15 , Figure 14 This is a schematic diagram of the optical path of a green laser beam in the fourth sequence of a lighting system according to an embodiment of the present invention. Figure 15 This is a schematic diagram of the optical path of a red laser beam in the fourth timing sequence of a lighting system according to an embodiment of the present invention. In the fourth timing sequence (i.e., yellow light timing sequence Y), the laser source module 11 can further provide at least one of a green laser beam GL and a red laser beam RL according to actual needs. Figure 14As shown, when the laser source module 11 provides a green laser beam GL in the fourth timing sequence, the green laser beam GL passes through the first region 13A of the color-dimming mirror 13 and is incident on the yellow light region 12Y of the wavelength conversion element 12. The green laser beam GL penetrates the anti-reflection layer 121Y of the first layer 121 and the third phosphor layer 122Y of the second layer 122, and is reflected back to the second region 13B of the color-dimming mirror 13 by the reflective substrate 123. It is then reflected by the second region 13B of the color-dimming mirror 13 to the light-diffusing component 14 to provide an illumination beam. Figure 15 As shown, when the laser source module 11 provides a red laser beam RL in the fourth timing, the red laser beam RL passes through the second region 13B of the color-dimming mirror 13 and is incident on the yellow light region 12Y of the wavelength conversion element 12. The red laser beam RL penetrates the anti-reflection layer 121Y of the first layer 121 and the third phosphor layer 122Y of the second layer 122, and is reflected back to the first region 13A of the color-dimming mirror 13 by the reflective substrate 123. It is then reflected by the first region 13A of the color-dimming mirror 13 to the light-diffusing component 14 to provide an illumination beam.

[0053] Please refer to the following: Figure 16 and Figure 17 , Figure 16 This is a schematic diagram of the arrangement of laser light-emitting elements in a laser light source module according to an embodiment of the present invention. Figure 17 This is a schematic diagram of the arrangement of laser emitters in a laser source module according to another embodiment. As shown, the laser source module 11 has multiple red laser emitters 11R that provide a red laser beam RL, multiple green laser emitters 11G that provide a green laser beam GL, and multiple blue laser emitters 11B that provide a blue laser beam BL. The user can adjust the arrangement of the laser emitters according to their needs. Figure 16 For example, multiple red laser emitters 11R are arranged in a row. Multiple green laser emitters 11G and multiple blue laser emitters 11B are arranged in different proportions in another row adjacent to the multiple red laser emitters 11R. Figure 17 For example, multiple red laser emitters 11R are arranged in two columns, while multiple green laser emitters 11G and multiple blue laser emitters 11B are each arranged in one column, and the multiple red laser emitters 11R, multiple green laser emitters 11G, and multiple blue laser emitters 11B are all arranged on the same substrate. In the aforementioned embodiments, the following method is used... Figure 17 The laser light source module is arranged in a certain way; however, the present invention does not limit the arrangement of the laser light-emitting components, which can be adjusted according to the user's needs.

[0054] Please refer to the following: Figure 18 This is a schematic diagram of a lighting system according to an embodiment of the present invention. Figure 18 The diagram only shows the optical paths of the green laser beam GL and the blue laser beam BL, omitting the optical paths of the red laser beam RL and the excited beam SL. This embodiment employs... Figure 16 The arrangement involves multiple red laser emitters 11R, multiple green laser emitters 11G, and multiple blue laser emitters 11B arranged together on the same substrate. Thus, the green laser beam GL and the blue laser beam BL face the color-separating mirror 13 from the same position and direction. This embodiment is relatively simple to manufacture, but its use is subject to many limitations due to the position of the laser emitters.

[0055] Please see Figure 19A , Figure 19A This is a schematic diagram of a lighting system according to another embodiment of the present invention. Figure 19A The diagram only shows the optical paths of the green laser beam GL and the blue laser beam BL, omitting the optical paths of the red laser beam RL and the excited beam SL. As shown, the illumination system 1 further includes a blue light splitter 16B, located between the first region 13A of the color separation mirror 13 and the laser source module 11. The laser source module 11 includes multiple red laser emitters 11R, multiple green laser emitters 11G, and multiple blue laser emitters 11B. The multiple green laser emitters 11G and the multiple blue laser emitters 11B are arranged on different planes. The multiple red laser emitters 11R are adapted to provide the red laser beam 11R, the multiple blue laser emitters 11B are adapted to provide the blue laser beam BL, and the multiple green laser emitters 11G are adapted to provide the green laser beam GL. A blue light beam splitter 16B is positioned on the light transmission path of the blue laser beam BL and the green laser beam GL. The blue light beam splitter 16B reflects the blue laser beam BL and allows the green laser beam GL to pass through, so that the blue laser beam BL and the green laser beam GL are incident on the first region 13A of the color-separating mirror 13 in the same direction. This embodiment, by using the blue light beam splitter 16B in conjunction with multiple independently arranged red laser emitters 11R, multiple green laser emitters 11G, and multiple blue laser emitters 11B, allows for flexible changes to the internal structural design of the lighting system 1.

[0056] Please see Figure 19B , Figure 19B This is a schematic diagram of a lighting system according to another embodiment of the present invention. Figure 19BThe diagram only shows the optical paths of the green laser beam GL and the blue laser beam BL, omitting the optical paths of the red laser beam RL and the excited beam SL. The illumination system 1 further includes a green beam splitter 16G, located between the first region 13A of the dichroic mirror 13 and the laser source module 11. The green beam splitter 16G reflects the green laser beam GL and allows the blue laser beam BL to pass through, so that the blue laser beam BL and the green laser beam GL are incident on the first region 13A of the dichroic mirror 13 in the same direction. In this embodiment, if... Figure 19A If the positions of the blue laser emitter 11B and the green laser emitter 11G are interchanged, then the original blue light splitter 16B needs to be replaced with the green light splitter 16G. This embodiment can generate more light source combinations by setting the blue light splitter 16B and the green light splitter 16G according to the user's needs.

[0057] Please refer to the following: Figure 20 and Figure 21 , Figure 20 A schematic diagram of a lighting system according to an embodiment of the present invention and Figure 21 yes Figure 20 A schematic diagram of the wavelength of the first region of the colorimetric mirror. Figure 20 Only the optical path of the red laser beam RL is shown, while the optical paths of the green laser beam GL, the blue laser beam BL, and the excited beam SL are omitted. (This is a continuation of the previous sentence.) Figure 19A The architecture, such as Figure 20 As shown, this embodiment further includes a red light beam splitter 16R, which allows the blue laser beam BL and the green laser beam GL to pass through and reflects the red laser beam RL from the first region 13A of the color-dimming mirror 13. The red light beam splitter 16R is located between the first region 13A of the color-dimming mirror 13 and the laser light source module 11. The first region 13A of the color-dimming mirror 13 reflects a first portion of the red laser beam RL from the wavelength conversion element 12 and allows a second portion of the red laser beam RL to pass through. The first portion of the red laser beam RL is reflected by the first region 13A of the color-dimming mirror 13 to the light-diffusing component 14 to provide an illumination beam. The second portion of the red laser beam RL passes through the first region 13A of the color-dimming mirror 13 and is transmitted to the red light beam splitter 16R. The second portion of the red laser beam RL is reflected by the red light beam splitter 16R and passes through the second region 13B of the color-dimming mirror 13 to the light-diffusing component 14 to provide an illumination beam. This embodiment can generate more light source combinations according to the user's needs by setting the red light beam splitter 16R.

[0058] As stated above, please refer to Figure 21In this embodiment, the first region 13A of the color-splitting mirror 13 allows blue laser beams BL and GL to pass through, but restricts the red laser beam RL to pass through by 50% of its light intensity. In this embodiment, the first region 13A reflects a first portion (containing 50% of the light intensity) of the red laser beam RL from the wavelength conversion element 12, while a second portion (containing the remaining 50% of the light intensity) passes through. This causes the first portion of the red laser beam RL to be directly transmitted towards the light-averaging component 14, and the second portion to be reflected by the red light splitter 16R. This embodiment allows for adjustments to the light intensity (not limited to 50%) in different regions of the color-splitting mirror 13 according to the user's needs, thereby generating more variations in light source combinations.

[0059] Please refer to the following: Figure 22 and Figure 23 , Figure 22 This is a schematic diagram of the optical path of a blue laser beam in an illumination system according to an embodiment of the present invention. Figure 23 yes Figure 22 A schematic diagram of the wavelength of the beam splitter. (See diagram below.) Figure 22 As shown, this embodiment further includes a beam splitter 17, located between the second region 13B of the dichroic mirror 13 and the wavelength conversion element 12. The beam splitter 17 reflects a first portion of the blue laser beam BL from the wavelength conversion element 12 and allows a second portion of the blue laser beam BL to pass through. The first portion of the blue laser beam BL is reflected by the beam splitter 17 to the light-diffusing component 14, and the second portion of the blue laser beam BL passes through the beam splitter 17 to the second region 13B of the dichroic mirror 13. The second portion of the blue laser beam BL is then reflected by the second region 13B of the dichroic mirror 13 to the light-diffusing component 14. This embodiment can generate more light source combinations according to the user's needs by adjusting the beam splitter 17.

[0060] As stated above, please refer to Figure 23 In this embodiment, the beam splitter 17 can limit the amount of light passing through the blue laser beam BL and the green laser beam GL by 50%. In this embodiment, the beam splitter 17 reflects a first portion (containing 50% of the light) of the blue laser beam BL from the wavelength conversion element 12, while a second portion of the blue laser beam BL passes through (containing the remaining 50% of the light). This allows the first portion of the blue laser beam BL to be directly transmitted toward the light homogenizing component 14, and the second portion of the blue laser beam BL to be reflected in the second region 13B of the dichroic mirror 13 to the light homogenizing component 14. This embodiment can generate more variations in light source combinations by adding the beam splitter 17 and limiting the amount of light passing through the blue laser beam BL and the green laser beam GL (not limited to 50%), according to the user's needs.

[0061] Please refer to the following:Figure 23 and Figure 24 , Figure 24 yes Figure 22 A schematic diagram of the optical path of the green laser beam in the illumination system is shown. As shown, the beam splitter 17 is used to reflect the first part of the green laser beam GL from the wavelength conversion element 12 and to allow the second part of the green laser beam GL to pass through. The first part of the green laser beam GL is reflected by the beam splitter 17 to the light-diffusing component 14, and the second part of the green laser beam GL passes through the beam splitter 17 to the second region 13B of the dichroic mirror 13. The second part of the green laser beam GL is then reflected by the second region 13B of the dichroic mirror 13 to the light-diffusing component 14. In this embodiment, the beam splitter 17 reflects the first part of the green laser beam GL from the wavelength conversion element 12 (containing 50% of the light), and the second part of the green laser beam GL passes through (containing the other 50% of the light). This allows the first part of the green laser beam GL to directly irradiate and transmit towards the light-diffusing component 14, and the second part of the green laser beam GL to be reflected by the second region 13B of the dichroic mirror 13 to the light-diffusing component 14.

[0062] Please refer to the following: Figure 1 This embodiment further provides a projection device 2, which includes an illumination system 1, a light modulation system 21, and a projection lens 22 as described above. The illumination system 1 provides an illumination beam. The light modulation system 21 is located in the transmission path of the illumination beam and is used to convert the illumination beam into an image beam. The projection lens 22 is located in the transmission path of the image beam and is used to project the image beam out of the projection device 2. This embodiment, through various implementations of the illumination system 1, can provide users with diverse usage options for the projection device 2.

[0063] The light modulation system 21 includes a light modulation element, such as a digital micromirror device (DMD), a liquid crystal on silicon (LCOS) panel, or other suitable spatial light modulator (SLM). In some embodiments, the light modulation system 21 may also be a transmissive liquid crystal panel, but the invention is not limited thereto. The projection lens 22 may include one or more optical lenses, and the refractive powers of the optical lenses may be the same or different from each other. For example, the optical lenses may include various non-planar lenses such as biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses, or any combination of the above-mentioned non-planar lenses. On the other hand, the projection lens 22 may also include planar optical lenses. This application does not impose any restrictions on the specific structure of the projection lens 22.

[0064] In summary, the embodiments of the present invention have at least one of the following advantages or effects. In the design of the lighting system of the present invention, the laser source module provides a three-color laser beam. The three-color laser beam is first directly irradiated onto a wavelength conversion element by a dichroic mirror. The wavelength conversion element contains phosphors. The three-color laser beam is reflected back to the dichroic mirror by the wavelength conversion element, and then reflected again by the dichroic mirror to a light-diffusing component to provide an illumination beam, thereby improving the shortcomings of laser speckle and providing a good lighting effect. In addition, the projection device using the lighting system of the present invention can have a good lighting projection effect.

[0065] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the invention are still within the scope of this patent. Furthermore, no embodiment or claim of the present invention needs to achieve all the objectives, advantages, or features disclosed in the invention. In addition, the abstract and title (invention title) are only used to assist in patent document retrieval and are not intended to limit the scope of the invention. Furthermore, the terms "first," "second," etc., mentioned in this specification or claims are only used to name elements or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.

Claims

1. A lighting system, characterized in that, include: Laser source module, used to provide blue laser beams, green laser beams and red laser beams; A wavelength converter is located in the transmission path of the red laser beam, the green laser beam and the blue laser beam. The wavelength converter is used to reflect the red laser beam, the green laser beam and the blue laser beam, and the wavelength converter is adapted to convert the blue laser beam to generate an excited beam. A colorimetric separator is located on the transmission path of the red laser beam, the green laser beam, the blue laser beam and the excited beam, and between the laser source module and the wavelength conversion device. The colorimetric separator is used to reflect at least a portion of the red laser beam, the green laser beam, the blue laser beam and the excited beam from the wavelength conversion device. as well as A homogenizing component, located in the transmission path of at least a portion of the red laser beam, the green laser beam, the blue laser beam, and the excited beam, is used to receive and homogenize the at least a portion of the red laser beam, the green laser beam, the blue laser beam, and the excited beam from the color-coding mirror to provide an illumination beam.

2. The lighting system as described in claim 1, characterized in that, The color-coded mirror includes a first region and a second region. The first region is adjacent to the second region. The first region is located in the transmission path of the green laser beam and the blue laser beam from the laser source module, allowing the green laser beam and the blue laser beam from the laser source module to pass through and reflect the red laser beam from the wavelength conversion element and at least a portion of the excited beam. The second region is located in the transmission path of the red laser beam from the laser source module, allowing the red laser beam from the laser source module to pass through and reflect the green laser beam, the blue laser beam, and at least a portion of the excited beam from the wavelength conversion element.

3. The lighting system as described in claim 2, characterized in that, The first region is a bandpass filter, and the transmission wavelength range of the first region is between 400nm and 480nm and between 510nm and 540nm. The second region is a high-pass filter, and the transmission wavelength range of the second region is between 610nm and 660nm.

4. The lighting system as described in claim 1, characterized in that, It also includes a lens assembly located between the wavelength conversion element and the color separation mirror.

5. The lighting system as described in claim 2, characterized in that, The wavelength conversion device includes a first layer, a second layer, and a reflective substrate stacked in sequence, with the first layer facing the dichroic mirror.

6. The lighting system as described in claim 5, characterized in that, The wavelength conversion device includes a red light region, a green light region, and a blue light region. The red light region, the green light region, and the blue light region are used to enter the light transmission path at different times. The first layer corresponding to the red light region is a red light reflective layer, the second layer corresponding to the red light region is a first phosphor layer, the first layer corresponding to the green light region is a green light reflective layer, and the second layer corresponding to the green light region is a second phosphor layer.

7. The lighting system as claimed in claim 6, characterized in that, Both the first phosphor layer and the second phosphor layer are phosphors used to convert the excited light beam into yellow.

8. The lighting system as claimed in claim 6, characterized in that, The first layer of the blue light region is an anti-reflective layer, and the second layer of the blue light region is a reflective layer.

9. The lighting system as claimed in claim 6, characterized in that, In the first timing sequence, the laser source module provides the blue laser beam and the red laser beam, but does not provide the green laser beam. The red light region of the wavelength conversion element enters the light transmission path, wherein... The blue laser beam passes through the first region of the color-sorting mirror and is incident on the red light region. The blue laser beam penetrates the red light reflective layer of the first layer and generates the excited beam in the first phosphor layer of the second layer. The excited beam is reflected back to the red light reflective layer of the first layer by the reflective substrate. A first portion of the excited beam penetrates the red light reflective layer and is transmitted to the color-sorting mirror, and then to the light-diffusing component. The red laser beam passes through the second region of the color-division mirror and is incident on the red light region. The red laser beam is reflected by the red light reflective layer of the first layer and transmitted to the first region of the color-division mirror, and then to the light-diffusing component.

10. The lighting system as claimed in claim 6, characterized in that, In the second timing sequence, the laser source module provides the blue laser beam and the green laser beam, but does not provide the red laser beam. The green light region of the wavelength conversion element enters the light transmission path. The blue laser beam and the green laser beam pass through the first region of the color-sorting mirror and are incident on the green light region. The blue laser beam penetrates the green light reflective layer of the first layer and generates the stimulated beam in the second phosphor layer of the second layer. The stimulated beam is reflected back to the green light reflective layer of the first layer by the reflective substrate. The second portion of the stimulated beam penetrates the green light reflective layer and is transmitted to the color separation mirror, and then to the light homogenizing component. The green laser beam is reflected by the green light reflective layer of the first layer and transmitted to the second region of the color separation mirror, and then to the light homogenizing component.

11. The lighting system as claimed in claim 6, characterized in that, In the third timing sequence, the laser source module provides the blue laser beam but does not provide the red laser beam or the green laser beam. The blue light region of the wavelength conversion element enters the light transmission path. The blue laser beam passes through the first region of the color-division mirror and is incident on the blue light region. The blue laser beam is reflected by the blue light region to the second region of the color-division mirror and is transmitted to the light-diffusing component.

12. The lighting system as claimed in claim 6, characterized in that, The wavelength conversion device further includes a yellow light region. The red light region, the green light region, the blue light region and the yellow light region are used to enter the light transmission path at different times. The first layer corresponding to the yellow light region is an anti-reflection layer, and the second layer corresponding to the yellow light region is a third phosphor layer. The third phosphor layer is a phosphor used to convert the excited light beam into yellow.

13. The lighting system as claimed in claim 12, characterized in that, In the fourth time sequence, the laser source module provides the blue laser beam, the yellow light region of the wavelength conversion element enters the light transmission path, the blue laser beam passes through the first region of the dividing color filter and is incident on the yellow light region, the blue laser beam penetrates the anti-reflection layer of the first layer and generates the excited beam in the third phosphor layer of the second layer, the excited beam is reflected by the reflective substrate to the dividing color filter, and then transmitted to the light homogenizing component.

14. The lighting system as claimed in claim 13, characterized in that, In the fourth time sequence, the laser source module further provides at least one of the green laser beam and the red laser beam, wherein... When the laser source module provides the green laser beam in the fourth timing sequence, the green laser beam passes through the first region of the color-coding mirror and is incident on the yellow light region of the wavelength conversion element. The green laser beam penetrates the anti-reflection layer of the first layer and the third phosphor layer of the second layer, and is reflected back to the color-coding mirror by the reflective substrate, and then reflected by the color-coding mirror to the light-diffusing component. When the laser source module provides the red laser beam in the fourth timing, the red laser beam passes through the second region of the color-dimming mirror and is incident on the yellow light region of the wavelength conversion element. The red laser beam penetrates the anti-reflection layer of the first layer and the third phosphor layer of the second layer, and is reflected back to the color-dimming mirror by the reflective substrate, and then reflected by the color-dimming mirror to the light-diffusing component.

15. The lighting system as claimed in claim 6, characterized in that, It further includes a red light beam splitter located between the first region of the color-splitting mirror and the laser source module. The first region of the color-splitting mirror is used to reflect a first portion of the red laser beam from the wavelength conversion element and to allow a second portion of the red laser beam to pass through. The first portion of the red laser beam is reflected by the first region of the color-splitting mirror to the light-diffusing component. The second portion of the red laser beam passes through the first region of the color-splitting mirror and is transmitted to the red light beam splitter. The second portion of the red laser beam is reflected by the red light beam splitter and passes through the second region of the color-splitting mirror to the light-diffusing component.

16. The lighting system as claimed in claim 6, characterized in that, It further includes a beam splitter located between the second region of the dichroic mirror and the wavelength conversion element. The beam splitter is used to reflect a first portion of the blue laser beam from the wavelength conversion element and to allow a second portion of the blue laser beam to pass through. The first portion of the blue laser beam is reflected by the beam splitter to the light-diffusing component, and the second portion of the blue laser beam passes through the beam splitter to the second region of the dichroic mirror. The second portion of the blue laser beam is reflected by the second region of the dichroic mirror to the light-diffusing component.

17. The lighting system as claimed in claim 16, characterized in that, The beam splitter is further used to reflect a first portion of the green laser beam from the wavelength conversion element and to allow a second portion of the green laser beam to pass through. The first portion of the green laser beam is reflected by the beam splitter to the light-diffusing component, and the second portion of the green laser beam passes through the beam splitter to the second region of the color-division mirror. The second portion of the green laser beam is reflected by the second region of the color-division mirror to the light-diffusing component.

18. The lighting system as claimed in claim 2, characterized in that, It further includes a blue light beam splitter located between the first region of the color-sorting mirror and the laser source module. The laser source module includes multiple red laser emitters, multiple green laser emitters, and multiple blue laser emitters. The multiple green laser emitters and the multiple blue laser emitters are disposed on different planes. The multiple red laser emitters are adapted to provide the red laser beam, the multiple blue laser emitters are adapted to provide the blue laser beam, and the multiple green laser emitters are adapted to provide the green laser beam. The blue light beam splitter is disposed in the light transmission path of the blue laser beam and the green laser beam. The blue light beam splitter is used to reflect the blue laser beam and allow the green laser beam to pass through, so that the blue laser beam and the green laser beam are incident on the color-sorting mirror in the same direction.

19. The lighting system as claimed in claim 2, characterized in that, It further includes a green light beam splitter located between the first region of the color-sorting mirror and the laser source module. The laser source module includes multiple red laser emitters, multiple green laser emitters, and multiple blue laser emitters. The multiple blue laser emitters and the multiple green laser emitters are disposed on different planes. The multiple red laser emitters are adapted to provide the red laser beam, the multiple blue laser emitters are adapted to provide the blue laser beam, and the multiple green laser emitters are adapted to provide the green laser beam. The green light beam splitter is disposed in the light transmission path of the blue laser beam and the green laser beam. The green light beam splitter is used to reflect the green laser beam and allow the blue laser beam to pass through, so that the blue laser beam and the green laser beam are incident on the color-sorting mirror in the same direction.

20. A projection device, characterized in that, include: The lighting system as described in any one of claims 1 to 19 is used to provide the lighting beam; An optical modulation system, located in the transmission path of the illumination beam, is used to convert the illumination beam into an image beam; as well as A projection lens is located on the transmission path of the image beam and is used to project the image beam out of the projection device.

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