Lighting system, projection device and projection control method

Abstract

This invention provides a lighting system, a projection device, and a projection control method. The lighting system includes a first light-emitting unit, a second light-emitting unit, a third light-emitting unit, a first color-separating element, a second color-separating element, and a control unit. The first light-emitting unit includes a first light-emitting element and a second light-emitting element. The control unit is electrically connected to the first light-emitting unit and is used to switch the lighting system between a high-efficiency mode and a high-chroma mode. When the lighting system is in high-efficiency mode, the control unit controls the current ratio of the second light-emitting element to be greater than the current ratio of the first light-emitting element. When the lighting system is in high-chroma mode, the control unit controls the current ratio of the second light-emitting element to be less than the current ratio of the first light-emitting element. The lighting system, projection device, and projection control method proposed in this invention have good reliability and produce output light beams with excellent color performance.

Description

Technical Field

[0001] The present invention relates to an optical system, an optical device comprising the above-described optical system, and a control method, and particularly to an illumination system, a projection device, and a projection control method. Background Technology

[0002] Recently, projection devices based on solid-state light sources such as light-emitting diodes (LEDs) and laser diodes have gradually gained a foothold in the market. One type of projection device uses independent light sources of three primary colors of LEDs as the source of its illumination beam, and these illumination beams are then modulated by a light valve to project an image beam onto the outside world.

[0003] However, due to the insufficient light source efficiency of current green light-emitting diodes (LEDs), when higher brightness is required, blue LEDs are used to excite yellow-green phosphors to obtain more efficient green light, and this is used as another projection device for green light source. However, the relative purity of the green light generated by this excitation is not pure enough, which leads to a yellowish color shift in the final white light produced by mixing, resulting in a smaller color gamut of the illumination beam, thus failing to meet the color gamut requirements of the display market.

[0004] The "Background Art" paragraph is only used to help understand the content of this invention. Therefore, the content disclosed in the "Background Art" paragraph may include some prior art that is not known to those skilled in the art. The content disclosed in the "Background Art" paragraph does not mean that the content or the problem to be solved by one or more embodiments of this invention was known or recognized by those skilled in the art before this application was filed. Summary of the Invention

[0005] The present invention provides a lighting system and a projection device, which have good reliability and enable the output beam to have good color performance.

[0006] This invention provides a projection control method that can easily adjust the illumination beam and make the final output image beam have good color performance.

[0007] Other objects and advantages of the present invention can be further understood from the technical features disclosed herein.

[0008] To achieve one or more of the above-mentioned objectives, or other objectives, an embodiment of the present invention provides an illumination system. The illumination system includes a first light-emitting unit, a second light-emitting unit, a third light-emitting unit, a first color-splitting element, a second color-splitting element, and a control unit. The first light-emitting unit includes a first light-emitting element and a second light-emitting element. The first light-emitting element provides a first sub-beam, and the second light-emitting element provides a second sub-beam. The dominant emission wavelength range of the first sub-beam falls within the dominant emission wavelength range of the second sub-beam, and the dominant emission wavelength range of the second sub-beam is greater than that of the first sub-beam. The second light-emitting unit is used to provide the second beam. The third light-emitting unit is used to provide a third beam. The first color-splitting element is located on the transmission path of the second and third beams. The second color-splitting element is located on the transmission path of the first sub-beam, the second sub-beam, the second beam, and the third beam. The second beam is reflected by the first color-splitting element and then transmitted to the second color-splitting element. The third beam passes through the first color-splitting element and then is transmitted to the second color-splitting element. The second and third beams are reflected by the second color-splitting element to form a portion of the illumination beam, and at least one of the first and second sub-beams is reflected by or passes through the second color-splitting element to form another portion of the illumination beam. The control unit is electrically connected to the first light-emitting unit and is used to switch the lighting system between a high-efficiency mode and a high-chroma mode. When the lighting system is in high-efficiency mode, the control unit controls the current ratio of the second light-emitting element to be greater than that of the first light-emitting element. When the lighting system is in high-chroma mode, the control unit controls the current ratio of the second light-emitting element to be less than that of the first light-emitting element.

[0009] To achieve one or more of the above-described objectives, or other objectives, an embodiment of the present invention provides a projection device. The projection device includes the aforementioned illumination system, at least one light valve, and a projection lens. The light valve is located in the transmission path of the illumination beam and is adapted to convert the illumination beam into at least one image beam. The projection lens is located in the transmission path of the at least one image beam and is adapted to project the at least one image beam out of the projection device.

[0010] To achieve one or more of the above-mentioned objectives, or other objectives, an embodiment of the present invention provides a projection control method. The projection control method is used to switch a projection device between a high-efficiency mode and a high-chroma mode. The projection device includes a first light-emitting unit, a second light-emitting unit, a third light-emitting unit, a first color-separating element, a second color-separating element, and a control unit. The first light-emitting unit includes a first light-emitting element and a second light-emitting element. The first light-emitting element provides a first sub-beam, and the second light-emitting element provides a second sub-beam. The range of the main emission wavelength of the first sub-beam falls within the range of the main emission wavelength of the second sub-beam, and the range of the main emission wavelength of the second sub-beam is greater than the range of the main emission wavelength of the first sub-beam. The second light-emitting unit provides the second beam, and the third light-emitting unit provides the third beam. The first color-separating element is located on the transmission path of the second and third beams, and the second color-separating element is located on the transmission path of the first sub-beam, the second sub-beam, and the second and third beams. The second light beam is reflected by the first color-splitting element and then transmitted to the second color-splitting element. The third light beam passes through the first color-splitting element and is then transmitted to the second color-splitting element. The second and third light beams are reflected by the second color-splitting element to form part of the illumination beam. At least one of the first and second sub-beams is reflected by or passes through the second color-splitting element to form another part of the illumination beam. The projection control method includes the following steps: When the projection device is in high-efficiency mode, the current ratio through the second light-emitting element is controlled to be greater than the current ratio through the first light-emitting element. When the projection device is in high-chroma mode, the current ratio through the second light-emitting element is controlled to be less than the current ratio through the first light-emitting element.

[0011] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the embodiments of the present invention, the lighting system and the projection device can be controlled by a control unit to control the different current ratios through the first light-emitting element and the second light-emitting element, thereby adjusting the composition of the green light portion in the illumination beam, and thus enabling the lighting system and the projection device to meet the requirements of both performance and color performance. Furthermore, the projection control method of this embodiment allows the lighting system and the projection device to easily switch between a high-performance mode and a high-chroma mode, thereby meeting the requirements of both performance and color performance of the lighting system and the projection device.

[0012] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below, and detailed descriptions are provided in conjunction with the accompanying drawings. Attached Figure Description

[0013] Figure 1 This is a block diagram of a projection device according to an embodiment of the present invention.

[0014] Figure 2A yes Figure 1 A schematic diagram of the optical path architecture of a lighting system.

[0015] Figure 2B yes Figure 2A A front view schematic diagram of the first light-emitting element and the second light-emitting element.

[0016] Figure 2C yes Figure 2A The emission wavelength spectrum and brightness diagram of the first and second sub-beams.

[0017] Figure 3 This is a flowchart of a projection control method according to an embodiment of the present invention.

[0018] Figure 4A yes Figure 1 A schematic diagram of the optical path architecture of another lighting system.

[0019] Figure 4B and Figure 4C They are Figure 4A A front view schematic diagram of the first light-emitting element and the second light-emitting element.

[0020] Figure 5 yes Figure 1 A schematic diagram of the optical path architecture of another lighting system. Detailed Implementation

[0021] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying views. The directional terms mentioned in the following embodiments (e.g., up, down, left, right, front, or back) are only for reference to the accompanying views. Therefore, the directional terms used are for illustrative purposes and not for limiting the present invention.

[0022] Figure 1 This is a block diagram of a projection device according to an embodiment of the present invention. Figure 2A yes Figure 1 A schematic diagram of the optical path architecture of a lighting system. Figure 2B yes Figure 2A A front view schematic diagram of the first light-emitting element and the second light-emitting element. Figure 2C yes Figure 2A The emission wavelength spectrum and brightness diagram of the first and second sub-beams are shown below. Please refer to... Figure 1In this embodiment, the projection device 200 includes an illumination system 100, at least one light valve 210, and a projection lens 220. The light valve 210 is located in the transmission path of the illumination beam 70 and is adapted to convert the illumination beam 70 into at least one image beam 80. The projection lens 220 is located in the transmission path of the at least one image beam 80 and is adapted to project the at least one image beam 80 out of the projection device. In this embodiment, there is one light valve 210, but the invention is not limited to this. In other embodiments, there may be multiple light valves 210. When there are three light valves 210, the illumination beam can be simultaneously output to the light valves 210. When there are fewer than three light valves 210, the illumination beam can be output sequentially in a time-varying manner, with different colored light portions being output in turn. Furthermore, in this embodiment, the light valve 210 may be a digital micromirror device (DMD) or a liquid-crystal-on-silicon panel (LCOS panel). However, in other embodiments, the light valve 210 may also be a transmissive liquid crystal panel or other beam modulator.

[0023] Specifically, such as Figure 1 and Figure 2A As shown, in this embodiment, the lighting system 100 is adapted to emit an illumination beam 70. The lighting system 100 includes a first light-emitting unit 110, a second light-emitting unit 120, a third light-emitting unit 130, a first color-separating element 140, a second color-separating element 150, and a control unit 160. Furthermore, optical lens groups CL can be respectively provided on the light beam transmission paths of the first light-emitting unit 110, the second light-emitting unit 120, and the third light-emitting unit 130 to collimate the light beams emitted by the first light-emitting unit 110, the second light-emitting unit 120, and the third light-emitting unit 130.

[0024] Please refer to further details. Figure 2A and Figure 2B In this embodiment, the first light-emitting unit 110 includes a first light-emitting element 111 and a second light-emitting element 112, and the first light-emitting element 111 and the second light-emitting element 112 are packaged on the same substrate SB. The first light-emitting element 111 and the second light-emitting element 112 respectively provide a first sub-beam 51G and a second sub-beam 52G. On the other hand, the second light-emitting unit 120 and the third light-emitting unit 130 are respectively used to provide a second beam 50R and a third beam 50B. In this embodiment, the first light-emitting element 111 is a green light-emitting diode, the second light-emitting unit 120 is a red light-emitting diode, and the third light-emitting unit 130 is a blue light-emitting diode. In other words, in this embodiment, the first sub-beam 51G is pure green light, the second beam 50R is pure red light, and the third beam 50B is pure blue light.

[0025] On the other hand, such as Figure 2B As shown, in this embodiment, the second light-emitting element 112 is a blue light-emitting diode coated with yellow-green phosphor. Thus, when the second light-emitting element 112 emits light, the yellow-green phosphor can absorb pure blue light and be excited to form a second sub-beam 52G of yellow-green light. This type of second light-emitting element 112 has higher optical efficiency than the first light-emitting element 111, but also has a relatively broad emission spectrum. More specifically, in this embodiment, as... Figure 2C As shown, the main emission wavelength range of the first sub-beam 51G falls within the main emission wavelength range of the second sub-beam 52G, and the main emission wavelength range of the second sub-beam 52G is greater than that of the first sub-beam 51G. The main emission wavelength range is, for example, the full width at half maximum (FWHM) of the main emission wavelength brightness (peak value), but is not limited thereto. The main emission wavelength of the first sub-beam 51G is, for example, greater than that of the second sub-beam 52G. For instance, in this embodiment, the main emission wavelength range of the first sub-beam 51G is between 570 nm and 585 nm (the main emission wavelength range is 15 nm), and the main emission wavelength range of the second sub-beam 52G is between 490 nm and 590 nm (the main emission wavelength range is 100 nm).

[0026] In addition, such as Figure 2A As shown, in this embodiment, the first color-splitting element 140 is located on the transmission path of the second beam 50R and the third beam 50B. The second color-splitting element 150 is located on the transmission path of the first sub-beam 51G, the second sub-beam 52G, the second beam 50R, and the third beam 50B. The second beam 50R and the third beam 50B are transmitted from the first color-splitting element 140 to the second color-splitting element 150, and the first color-splitting element 140 is not on the transmission path of the first sub-beam 51G and the second sub-beam 52G. The second light-emitting unit 120 and the third light-emitting unit 130 are respectively located on both sides of the first color-splitting element 140 (the beams from the second light-emitting unit 120 and the third light-emitting unit 130 are respectively incident on different side surfaces of the first color-splitting element 140). The first color-splitting element 140 and the first light-emitting unit 110 are respectively located on both sides of the second color-splitting element 150. Furthermore, in this embodiment, the first dichroic element 140 is, for example, a dichroic mirror that reflects red light and allows transmission of other colors (e.g., blue light) (in other embodiments, the first dichroic element 140 may be a dichroic mirror that reflects blue light and allows transmission of other colors), and the second dichroic element 150 is, for example, a dichroic mirror that reflects both red and blue light and allows transmission of other colors (e.g., yellow-green light). Thus, as... Figure 2AAs shown, the first sub-beam 51G and the second sub-beam 52G are formed into a first beam 50G and transmitted to the second dichroic element 150. The second beam 50R is reflected by the first dichroic element 140 and then transmitted to the second dichroic element 150. The third beam 50B passes through the first dichroic element 140 and is then transmitted to the second dichroic element 150. The second dichroic element 150 reflects the second beam 50R and the third beam 50B to form the red and blue light portions of the illumination beam 70, and allows the first beam 50G to pass through to form the green light portion of the illumination beam 70. Furthermore, as... Figure 2A As shown, in this embodiment, the first beam 50G, the second beam 50R, and the third beam 50B exit the lighting system 100 in the same direction, which is along the first direction D1. For example, in an embodiment not shown, the lighting system 100 may also include a light-diffusing element. The first beam 50G, the second beam 50R, and the third beam 50B are transmitted to the light-diffusing element in the same incident direction (with approximately the same incident angle). After being homogenized by the light-diffusing element, they exit the lighting system 100 from the light-diffusing element in the same direction.

[0027] In this embodiment, since the lighting system 100 can form the three primary colors of the lighting beam 70 through the first sub-beam 51G and the second sub-beam 52G, and the second beam 50R and the third beam 50B of the first beam 50G, a color filter module is not required. In other words, the main emission wavelength range of the second sub-beam 52G transmitted to the second beam splitter 150 is the same as the main emission wavelength range of the second sub-beam 52G transmitted to at least one light valve. Here, "the same main emission wavelength range" means that the difference in their main emission wavelength ranges is less than 5%.

[0028] On the other hand, such as Figure 2A As shown, in this embodiment, the lighting system 100 may selectively be configured with an auxiliary light-emitting unit 170. The auxiliary light-emitting unit 170 is, for example, a blue light-emitting diode that emits short-wavelength blue light, and can thus be used to provide an auxiliary light beam AL. The auxiliary light-emitting unit 170 and the first light-emitting unit 110 are located on the same side of the second dichroic element 150 (the light beams from the auxiliary light-emitting unit 170 and the first light-emitting unit 110 are respectively incident on the same side surface of the second dichroic element 150), and face the first dichroic element 140 and the second dichroic element 150. The auxiliary light beam AL is reflected by the second dichroic element 150 and transmitted to the second light-emitting element 112 of the first light-emitting unit 110. In this embodiment, the auxiliary light beam AL provided by the auxiliary light-emitting unit 170 can cause the yellow-green phosphor of the second light-emitting element 112 to absorb more blue light, thereby increasing the light intensity of the second sub-beam 52G. That is, the second sub-beam 52G may include the blue light-emitting diode of the second light-emitting element 112 and the light beam formed by the auxiliary light-emitting unit 170 illuminating the yellow-green phosphor of the second light-emitting element 112.

[0029] It is worth noting that, although the second dichroic element 150 in the foregoing embodiments is exemplified as a dichroic mirror that reflects red and blue light while allowing yellow-green light to pass through, the present invention is not limited to this. In other embodiments, the second dichroic element 150 may also be a dichroic mirror that reflects yellow-green light and allows red and blue light to pass through. In this embodiment, the first beam 50G, the second beam 50R, and the third beam 50B will exit the illumination system 100 in the same direction, but along the second direction D2. Furthermore, since the second dichroic element 150 is used to reflect one of the auxiliary beam AL and the first beam 50G, and to allow the other of the auxiliary beam AL and the first beam 50G to pass through, in this embodiment, the auxiliary light-emitting unit 170 and the first light-emitting unit 110 are located on opposite sides of the second dichroic element 150. After the auxiliary beam AL passes through the second dichroic element 150, it is transmitted to the second light-emitting element 112 of the first light-emitting unit 110. Any person skilled in the art, upon referring to this invention, can make appropriate modifications to its optical path configuration to achieve the same results as... Figure 2A Similar effects and advantages as the embodiments described herein, but which should still fall within the scope of this invention, will not be elaborated further here.

[0030] The following will combine Figure 1 , Figure 2A , Figure 2B and Figure 3 This will provide a further explanation of how the lighting system 100 forms various colored lights of the lighting beam 70 under different modes.

[0031] Specifically, in this embodiment, the lighting system 100 has a high-efficiency mode and a high-chroma mode, and as follows: Figure 2A As shown, the control unit 160 is electrically connected to the first light-emitting unit 110, and is used to switch the lighting system 100 between a high-efficiency mode and a high-chroma mode. For example, Figure 1 and Figure 2A The lighting system 100 and projection device 200 shown can be used to perform Figure 3The projection control method ensures that when the lighting system 100 is in high-efficiency mode, the control unit 160 controls the current ratio through the second light-emitting element 112 to be greater than the current ratio through the first light-emitting element 111; and when the lighting system 100 is in high-chroma mode, the control unit 160 controls the current ratio through the second light-emitting element 112 to be less than the current ratio through the first light-emitting element 111. This allows adjustment of the composition of the green light portion in the lighting beam 70, thereby balancing the requirements of efficiency and color performance. Here, the current ratio refers to the proportion of the current through the first light-emitting element 111 (or the second light-emitting element 112) in the first light-emitting unit 110 to the total current (i.e., the total current through the first light-emitting unit 110).

[0032] In this invention, when the projection device 200 is in either a high-performance mode or a high-color-ratio mode, it is determined whether the projection device 200 needs to switch to the other mode. If yes, the projection device 200 is switched to the other mode; otherwise, the projection device 200 remains in its original mode. For example, such as... Figure 3 As shown, when the projection device 200 is preset to high-efficiency mode (the projection device 200 is in high-efficiency mode), the control unit 160 can control the current ratio through the second light-emitting element 112 to 90% to 95% and the current ratio of the first light-emitting element 111 to 5% to 10%. At this time, since the current ratio through the second light-emitting element 112 is higher, most of the green light can be provided by the second sub-beam 52G provided by the second light-emitting element 112 with higher light efficiency. In this way, the first light-emitting unit 110 can have relatively high light efficiency. However, the relative spectral purity of the first beam 50G formed in this way is lower, resulting in a smaller color gamut of the illumination beam 70 formed by it, but it can meet the requirements of high brightness.

[0033] Next, if the user determines that their usage scenario requires the projection device 200 to have high color performance (e.g., the user switches modes), step S110 can be executed to switch the projection device 200 to high chroma mode. Specifically, when the projection device 200 is in high chroma mode, the control unit 160 controls the current percentage through the second light-emitting element 112 to 5% to 10% and the current percentage through the first light-emitting element 111 to 95% to 100%. At this time, since the current percentage through the first light-emitting element 111 is high, the first sub-beam 51G with relatively high spectral purity can be used as most of the green light. The first beam 50G thus formed has relatively high spectral purity and can form an illumination beam 70 with a large color gamut, thereby meeting the requirements of a wide color gamut. Conversely, if the user determines that their usage scenario does not require the projection device 200 to have high color performance (e.g., the user does not switch modes), step S120 can be executed to keep the projection device 200 in high-efficiency mode. On the other hand, as Figure 3 As shown, when the projection device 200 is in high color saturation mode, the user can also determine whether the projection device 200 needs to have a higher brightness performance. When the user determines that the projection device 200 needs to have a higher brightness performance, step S130 can be executed to switch the projection device 200 to high-efficiency mode. When the user determines that the projection device 200 does not need to have a higher brightness performance, step S140 can be executed to keep the projection device 200 in high color saturation mode.

[0034] In this way, the lighting system 100 and the projection device 200 can control the different current ratios of the first light-emitting element 111 and the second light-emitting element 112 through the control unit 160, thereby adjusting the composition of the green light portion in the illumination beam 70, and thus enabling the lighting system 100 and the projection device 200 to meet the needs of both performance and color performance. Furthermore, the projection control method of this embodiment allows the lighting system 100 and the projection device 200 to easily switch between high-performance mode and high-chroma mode, thereby meeting the needs of both performance and color performance. It is worth noting that in other embodiments of the present invention, the step of the user determining the usage scenario can be performed by the control unit 160. For example, the control unit 160 can comprehensively determine factors such as ambient brightness, projected content (video or presentation), and / or user settings, and automatically switch (or maintain) to high-chroma mode or high-performance mode, thereby further improving the ease of use of the projection device.

[0035] Figure 4A yes Figure 1 A schematic diagram of the optical path architecture of another lighting system. Figure 4B and Figure 4C They are Figure 4AA front view diagram of the first and second light-emitting elements. Please refer to... Figures 4A to 4C , Figure 4A Lighting system 400 and Figure 2A The illumination system 100 is similar, but with the following differences. In this embodiment, the first light-emitting element 411 and the second light-emitting element 412 of the first light-emitting unit 410 are packaged on different substrates SB1 and SB2, and the first sub-beam 51G and the second sub-beam 52G are incident on the second color-separating element 150 in the same direction. In other words, in this embodiment, the first light-emitting element 411 and the second light-emitting element 412 of the first light-emitting unit 410 can, for example, be arranged side by side on a third direction D3. This increases the light-receiving area of ​​the first sub-beam 51G and the second sub-beam 52G, further improving their optical efficiency. Furthermore, when an auxiliary light-emitting unit 170 is provided, the auxiliary light-emitting unit 170 and the second light-emitting element 412 need to be aligned in their optical paths so that the auxiliary beam AL is transmitted to the second light-emitting element 412.

[0036] Thus, the lighting system 400 can also be used to perform... Figure 3 The projection control method involves controlling the different current ratios of the first light-emitting element 411 and the second light-emitting element 412 through the control unit 160. This allows the composition of the green light portion in the illumination beam 70 to be adjusted, enabling the lighting system 400 to balance performance and color reproduction requirements, achieving similar effects and advantages to the aforementioned lighting system 100. Further details are omitted here. Furthermore, when the lighting system 400 is applied to the projection device 200, it also enables the projection device 200 to achieve similar effects and advantages, which are also omitted here.

[0037] Figure 5 yes Figure 1 This is a schematic diagram of the optical path architecture of another lighting system. Please refer to... Figure 5 , Figure 5 Lighting system 500 and Figure 4A The lighting system 400 is similar, but the differences are as follows. In this embodiment, the second dichroic element 550 is an X-type beam splitter, and includes a first sub-dichroic element 551 and a second sub-dichroic element 552 that are not parallel (e.g., perpendicular and intersecting at the middle of the element), wherein the first sub-dichroic element 551 and Figure 2A The second dichroic element 150 has the same optical function and is positioned in the same way, so that it can reflect the second beam 50R and the third beam 50B, and allow the first beam 50G to pass through.

[0038] On the other hand, such as Figure 5As shown, in this embodiment, the first sub-beam 51G of the first light-emitting element 411 of the first light-emitting unit 410 and the second sub-beam 52G of the second light-emitting element 412 are incident on the second color-splitting element 550 (second sub-color-splitting element 552) in different directions, and the second sub-color-splitting element 552 of the second color-splitting element 550 reflects one of the first sub-beam 51G and the second sub-beam 52G, and allows the other of the first sub-beam 51G and the second sub-beam 52G to pass through. More specifically, in this embodiment, the first light-emitting element 411 and the second light-emitting element 412 are located on different sides of the second sub-color-splitting element 552 of the second color-splitting element 550, and for example, on opposite sides of the normal to the surface of the first sub-color-splitting element 551 of the second color-splitting element 550 facing the first light-emitting element 411 and the second light-emitting element 412 (the first light-emitting element 411 and the second light-emitting element 412 are located on the same side of the first sub-color-splitting element 551 of the second color-splitting element 550). Thus, the first sub-beam 51G and the second sub-beam 52G can be incident on the second sub-color-splitting element 552 of the second color-splitting element 550 along the opposite directions of the first direction D1 and the second direction D2, respectively. Furthermore, in this embodiment, the second sub-color-splitting element 552 of the second color-splitting element 550 reflects the first sub-beam 51G and allows the second sub-beam 52G to pass through.

[0039] Furthermore, it is worth noting that due to the limitations of the aforementioned optical path configuration, this embodiment does not include an auxiliary light-emitting unit 170. Therefore, its performance is slightly lower than that of the lighting system 100 containing the auxiliary light-emitting unit 170. However, the lighting system 500 can also be used to perform [the task]. Figure 3 The projection control method, by controlling the different current ratios of the first light-emitting element 411 and the second light-emitting element 412 through the control unit 160, can adjust the composition of the green light portion in the illumination beam 70, thereby enabling the lighting system 500 to meet the requirements of both performance and color reproduction, thus achieving similar effects and advantages to the aforementioned lighting system 400, which will not be elaborated further here. Furthermore, when the lighting system 500 is applied to the projection device 200, it can also enable the projection device 200 to achieve similar effects and advantages as described above, which will not be elaborated further here.

[0040] In summary, the embodiments of the present invention have at least one of the following advantages or effects. In the embodiments of the present invention, the lighting system and projection device can be controlled by a control unit to control different current ratios through the first and second light-emitting elements, thereby adjusting the composition of the green light portion in the illumination beam, thus enabling the lighting system and projection device to meet both performance and color reproduction requirements. Furthermore, the projection control method of this embodiment allows the lighting system and projection device to easily switch between a high-performance mode and a high-chroma mode, thereby meeting both performance and color reproduction requirements.

[0041] 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 specification of the present 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 present invention. In addition, the abstract and title of the invention are used only 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.

[0042] List of reference numerals

[0043] 51G: First Subbeam

[0044] 52G: Second Sub-beam

[0045] AL: Auxiliary Beam

[0046] 50G: First Beam

[0047] 50R: Second beam

[0048] 50B: Third Beam

[0049] 70: Illumination beam

[0050] 80: Image beam

[0051] 100, 400, 500: Lighting systems

[0052] 110: First light-emitting unit

[0053] 111, 411: First light-emitting element

[0054] 112, 412: Second light-emitting element

[0055] 120: Second light-emitting unit

[0056] 130: Third light-emitting unit

[0057] 140: First color separation element

[0058] 150, 550: Second color separation element

[0059] 160: Control Unit

[0060] 170: Auxiliary light-emitting unit

[0061] 200: Projection device

[0062] 210: Light valve

[0063] 220: Projection lens

[0064] 551: First sub-color separation element

[0065] 552: Second sub-color separation element

[0066] CL: Optical lens group

[0067] D1: First Direction

[0068] D2: Second Direction

[0069] D3: Third direction

[0070] SB, SB1, SB2: base board.

Claims

1. A lighting system, characterized in that, The lighting system includes a first light-emitting unit, a second light-emitting unit, a third light-emitting unit, a first color-separating element, a second color-separating element, and a control unit, wherein: The first light-emitting unit includes a first light-emitting element and a second light-emitting element, wherein the first light-emitting element provides a first sub-beam, the second light-emitting element provides a second sub-beam, the main emission wavelength range of the first sub-beam falls within the main emission wavelength range of the second sub-beam, and the main emission wavelength range of the second sub-beam is greater than the main emission wavelength range of the first sub-beam; The second light-emitting unit is used to provide a second light beam; The third light-emitting unit is used to provide a third light beam; The first color separation element is located on the transmission path of the second beam and the third beam; The second dichroic element is located on the transmission path of the first sub-beam, the second sub-beam, the second beam, and the third beam, wherein the second beam is reflected by the first dichroic element and then transmitted to the second dichroic element, the third beam passes through the first dichroic element and then is transmitted to the second dichroic element, the second beam and the third beam are reflected by the second dichroic element to form part of the illumination beam, and at least one of the first sub-beam and the second sub-beam is reflected by or passes through the second dichroic element to form another part of the illumination beam; and The control unit is electrically connected to the first light-emitting unit and is used to switch the lighting system between a high-efficiency mode and a high-chroma mode. When the lighting system is in the high-efficiency mode, the control unit controls the current ratio of the second light-emitting element to be greater than the current ratio of the first light-emitting element. When the lighting system is in the high-chroma mode, the control unit controls the current ratio of the second light-emitting element to be less than the current ratio of the first light-emitting element.

2. The lighting system according to claim 1, characterized in that, The first color-separating element and the first light-emitting unit are respectively located on both sides of the second color-separating element.

3. The lighting system according to claim 1, characterized in that, The lighting system further includes an auxiliary light-emitting unit for providing an auxiliary light beam, wherein the auxiliary light-emitting unit and the first light-emitting unit are located on the same side of the second color-separating element, and the auxiliary light beam is transmitted to the second light-emitting element after being reflected by the second color-separating element.

4. The lighting system according to claim 1, characterized in that, The first light-emitting element and the second light-emitting element are packaged on the same substrate.

5. The lighting system according to claim 1, characterized in that, The first light-emitting element and the second light-emitting element are packaged on different substrates, and the first sub-beam and the second sub-beam are incident on the second color-separating element in the same direction.

6. The lighting system according to claim 1, characterized in that, The first light-emitting element and the second light-emitting element are packaged on different substrates. The first sub-beam and the second sub-beam are incident on the second color-separating element in different directions. The second color-separating element reflects one of the first sub-beam and the second sub-beam, and allows the other of the first sub-beam and the second sub-beam to pass through.

7. The lighting system according to claim 1, characterized in that, When the lighting system is in the high-efficiency mode, the control unit controls the current ratio of the second light-emitting element to 90% to 95% and the current ratio of the first light-emitting element to 5% to 10%. When the lighting system is in the high-chroma mode, the control unit controls the current ratio of the second light-emitting element to 5% to 10% and the current ratio of the first light-emitting element to 95% to 100%.

8. The lighting system according to claim 1, characterized in that, The main emission wavelength of the first sub-beam is between 570 nm and 585 nm, and the main emission wavelength of the second sub-beam is between 490 nm and 590 nm.

9. A projection device, characterized in that, The projection device includes an illumination system, at least one light valve, and a lens module, wherein: The lighting system includes a first light-emitting unit, a second light-emitting unit, a third light-emitting unit, a first color-separating element, a second color-separating element, and a control unit, wherein: The first light-emitting unit includes a first light-emitting element and a second light-emitting element, wherein the first light-emitting element provides a first sub-beam, the second light-emitting element provides a second sub-beam, the main emission wavelength range of the first sub-beam falls within the main emission wavelength range of the second sub-beam, and the main emission wavelength range of the second sub-beam is greater than the main emission wavelength range of the first sub-beam; The second light-emitting unit is used to provide a second light beam; The third light-emitting unit is used to provide a third light beam; The first color separation element is located on the transmission path of the second beam and the third beam; The second dichroic element is located on the transmission path of the first sub-beam, the second sub-beam, the second beam, and the third beam, wherein the second beam is reflected by the first dichroic element and then transmitted to the second dichroic element, the third beam passes through the first dichroic element and then is transmitted to the second dichroic element, the second beam and the third beam are reflected by the second dichroic element to form part of the illumination beam, and at least one of the first sub-beam and the second sub-beam is reflected by or passes through the second dichroic element to form another part of the illumination beam; and The control unit is electrically connected to the first light-emitting unit and is used to switch the lighting system between a high-efficiency mode and a high-chroma mode. When the lighting system is in the high-efficiency mode, the control unit controls the current ratio of the second light-emitting element to be greater than the current ratio of the first light-emitting element. When the lighting system is in the high-chroma mode, the control unit controls the current ratio of the second light-emitting element to be less than the current ratio of the first light-emitting element. The at least one light valve is disposed on the transmission path of the illumination beam for converting the illumination beam into at least one image beam; and The lens module is disposed on the transmission path of the at least one image beam and is used to project the at least one image beam out of the projection device.

10. The projection device according to claim 9, characterized in that, The main emission wavelength range of the second sub-beam transmitted to the second color separation element is the same as the main emission wavelength range of the second sub-beam transmitted to the at least one optical valve.

11. A projection control method for switching a projection device between a high-efficiency mode and a high-chroma mode, the projection device comprising a first light-emitting unit, a second light-emitting unit, a third light-emitting unit, a first color separation element, a second color separation element, and a control unit, wherein the first light-emitting unit includes a first light-emitting element and a second light-emitting element, the first light-emitting element providing a first sub-beam, the second light-emitting element providing a second sub-beam, the range of the main emission wavelength of the first sub-beam falling within the range of the main emission wavelength of the second sub-beam, the range of the main emission wavelength of the second sub-beam being greater than the range of the main emission wavelength of the first sub-beam, the second light-emitting unit being used to provide the second beam, and the third light-emitting unit being used to provide... A third beam, wherein the first dichroic element is located on the transmission path of the second beam and the third beam, the second dichroic element is located on the transmission path of the first sub-beam, the second sub-beam, the second beam and the third beam, the second beam is reflected by the first dichroic element and then transmitted to the second dichroic element, the third beam passes through the first dichroic element and then is transmitted to the second dichroic element, the second beam and the third beam are reflected by the second dichroic element to form part of the illumination beam, and at least one of the first sub-beam and the second sub-beam is reflected by or passes through the second dichroic element to form another part of the illumination beam, characterized in that... The projection control method includes: When the projection device is in the high-efficiency mode, the current ratio of the second light-emitting element is controlled to be greater than the current ratio of the first light-emitting element; and When the projection device is in the high color saturation mode, the current ratio of the second light-emitting element is controlled to be less than the current ratio of the first light-emitting element.

12. The projection control method according to claim 11, characterized in that, The projection control method further includes: When the projection device is in either the high-performance mode or the high-color-ratio mode, determine whether the projection device needs to switch to the other mode; and If yes, then the projection device is switched to the other of the high-performance mode and the high-color-ratio mode; otherwise, the projection device is kept in the other of the high-performance mode and the high-color-ratio mode.

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