Lighting system and projection device
By using optical path switching components and wavelength conversion devices for optical plates and electronic control elements, the problems of color distortion and noise in projection devices are solved, enabling rapid beam switching and high-brightness projection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CORETRONIC CORPORATION
- Filing Date
- 2025-01-21
- Publication Date
- 2026-07-21
AI Technical Summary
In existing projection devices, the slow response speed of the phosphor wheel leads to color distortion, and increasing the phosphor wheel speed causes excessive noise.
The optical path switching component, composed of an optical plate and electronic control elements, switches the beam path by controlling the deflection of the optical plate. Combined with a wavelength conversion component, it achieves rapid beam switching and avoids color distortion.
It effectively suppresses color distortion, reduces noise, improves response speed, and provides high-brightness and high-quality image projection effects.
Smart Images
Figure CN122431050A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to an optical system, and more particularly to an illumination system and a projection device. Background Technology
[0002] With the evolution of projection technology, projection devices capable of projecting high-brightness images have been developed. Some projection devices use a laser light source combined with a phosphor wheel (wavelength conversion wheel) as the source of the illumination beam. However, in projection devices using a time-rotating phosphor wheel, the slow response speed of the phosphor wheel often leads to color breaking, meaning that when the phosphor wheel rotates slowly, the frequency of color switching per unit time is low, causing the human eye to perceive rainbow patterns. However, if the rotation speed of the phosphor wheel is increased to improve the color breaking problem, the noise generated by the phosphor wheel and its drive motor will become excessive.
[0003] 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 known technologies that are not known to those skilled in the art. The content disclosed in the "Background Art" paragraph does not mean that the content or the problems to be solved by one or more embodiments of this invention were known or understood by those skilled in the art prior to this application. Summary of the Invention
[0004] This invention provides a lighting system and a projection device that can effectively suppress color cracking and laser speckle.
[0005] Other objects and advantages of the present invention can be further understood from the technical features disclosed herein.
[0006] To achieve one, some, or all of the above-mentioned objectives, or other objectives, one embodiment of the present invention provides an illumination system, including a light source module, a light path switching component, and a wavelength conversion component. The light source module emits a first color light, a second color light, and a third color light, wherein the first color light has a polarization state and propagates in a first direction, while the second and third color lights propagate in a second direction, the first direction being different from the second direction. The light path switching component is disposed on the propagation path of the first color light and includes an electronic control element and an optical plate. The electronic control element is connected to the optical plate and is used to control the deflection of the optical plate. When the incident angle of the first color light on the optical plate is greater than or equal to M degrees, the optical plate allows the first color light to pass through or reflect. The wavelength conversion component is disposed on the propagation path of the first color light penetrating the optical plate and is used to convert the first color light into a converted light beam.
[0007] To achieve one or more of the above-mentioned objectives, or other objectives, one embodiment of the present invention provides a projection device, including the aforementioned illumination system, light valve, and projection lens. The illumination system provides an illumination beam, and the light valve is disposed in the transmission path of the illumination beam and is used to convert the illumination beam into an image beam. The illumination beam includes at least one of a first color light, a converted beam, a second color light, and a third color light. The projection lens is disposed in the transmission path of the image beam and is used to project the image beam out of the projection device.
[0008] Based on the above, the lighting system and projection device of the embodiments of the present invention have at least one of the following advantages: In the lighting system and projection device of the embodiments of the present invention, when the incident angle of the first color light incident on the optical plate is greater than or equal to M degrees, the optical plate is used to allow the first color light to pass through or reflect the first color light. Therefore, the lighting system and projection device of the embodiments of the present invention can switch whether the beam is generated or not by simply deflecting the optical plate, thus having a shorter response time (i.e., faster switching) and effectively suppressing the phenomenon of color clipping. Attached Figure Description
[0009] Figure 1A This is a schematic diagram of the optical path of a projection device in the first timing sequence according to an embodiment of the present invention.
[0010] Figure 1B for Figure 1A The projection device is shown in the optical path diagram of the second time sequence.
[0011] Figure 2A for Figure 1A A side view of the light source module as seen from the +x direction.
[0012] Figure 2B for Figure 1A A cross-sectional view of the light source module viewed from the +y direction.
[0013] Figures 3A to 3C They are respectively Figure 1A and Figure 1B Side view diagrams of the optical path switching component in three different states.
[0014] Figure 4 for Figure 1A A frontal view of the wavelength conversion device viewed from the +x direction.
[0015] Figure 5 yes Figure 1A and Figure 1B The graph shows the relationship between the reflectivity of the optical plate and the incident angle of the light beam.
[0016] Figure 6 yes Figure 1A and Figure 1BTiming diagram of the light source module in the image.
[0017] Figure 7 This is a side view of the light source module as seen from the -z direction, according to another embodiment of the present invention.
[0018] Figures 8A to 8C They are respectively Figure 1A and Figure 1B Another embodiment of the optical path switching component is shown in side view diagrams in three different states.
[0019] Explanation of reference numerals in the attached figures:
[0020] 100: Projection device
[0021] 110: Light valve
[0022] 112: Image Beam
[0023] 120: Projection lens
[0024] 200: Lighting System
[0025] 202: Illumination beam
[0026] 210: First beam splitter
[0027] 220: First homogenizing element
[0028] 230: Wavelength conversion component
[0029] 232: Phosphor
[0030] 240: Second homogenizing element
[0031] 250: Second beam splitter
[0032] 260, 261, 262: Reflectors
[0033] 263: Internal Total Internal Reflection Prism
[0034] 264: Lens
[0035] 270: Third beam splitter
[0036] 300, 300b: Light source module
[0037] 312: Red laser diode
[0038] 314: Green laser diode
[0039] 316: Blue laser diode
[0040] 322: Reflective element
[0041] 324, 326: Dichroic mirror
[0042] 328: Reflector
[0043] 330: Guiding Component
[0044] 336: First reflecting mirror
[0045] 332: Second reflecting mirror
[0046] 334: Third reflecting mirror
[0047] 400, 400a: Optical path switching components
[0048] 410, 410a: Electrical control components
[0049] 412, 412a: First component
[0050] 4121: First coil
[0051] 4122: First fixed magnet
[0052] 414, 414a: Second component
[0053] 4141: Second coil
[0054] 4142: Second fixed magnet
[0055] 420: Optical plate
[0056] A1: Axis
[0057] B: Primary color light
[0058] C: Convert beam
[0059] G: Third color light
[0060] R: Second color light
[0061] S1: First timing sequence
[0062] S2: Second timing sequence
[0063] T1, T2, T3, T4: Time intervals
[0064] x, y, z: direction. Detailed Implementation
[0065] 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.
[0066] Figure 1AThis is a schematic diagram of the optical path of a projection device according to an embodiment of the present invention in the first timing sequence. Figure 1B for Figure 1A A schematic diagram of the optical path of the projection device in the second time sequence. Figure 2A for Figure 1A This is a side view diagram of the light source module viewed from the +x direction. To make the diagram simple and easy to understand, Figure 2A The second and third reflectors of the guidance assembly are omitted. Figure 2B for Figure 1A A cross-sectional view of the light source module viewed from the +y direction, showing its orientation along... Figure 2A A cross-sectional view of line II. Figures 3A to 3C They are respectively Figure 1A and Figure 1B The side view diagrams of the optical path switching component in three different states, and Figure 4 for Figure 1A A frontal view of the wavelength conversion element as seen from the +x direction. Please refer to... Figure 1A , Figure 1B , Figure 2A , Figure 2B , Figures 3A to 3C and Figure 4 The projection device 100 of this embodiment includes an illumination system 200, a light valve 110, and a projection lens 120. The illumination system 200 provides an illumination beam 202 and includes a light source module 300, a light path switching component 400, and a wavelength conversion component 230. The light source module emits a first color light (e.g., a blue beam) B, a second color light (e.g., a red beam) R, and a third color light (e.g., a green beam) G. The first color light B has a polarization state, and the first color light B from the light source module 300 is directed in a first direction (e.g., ...). Figure 1A The second color light R and the third color light G travel in the second direction (e.g., the x-direction), and propagate in the x-direction. Figure 1A The propagation occurs in the y-direction. The first direction differs from the second direction.
[0067] In this embodiment, the light source module 300 includes at least one red laser diode 312, at least one green laser diode 314, and at least one blue laser diode 316 located in the same package. Figure 2AThis example uses two (or two strings of) red laser diodes 312, one (or one string of) green laser diodes 314, and one (or one string of) blue laser diodes 316. The blue laser diode 316 emits the first color light B, the red laser diode 312 emits the second color light R, and the green laser diode 314 emits the third color light G. In this embodiment, the light source module 300 also includes a reflective element (such as a reflector) 322, a dichroic mirror 324, and a guiding component 330. The reflective element 322 and the dichroic mirror 324 are used to transmit the second color light R and the third color light G in the second direction (i.e., the +y direction). The dichroic mirror 324 is used to allow the second color light R to pass through and reflect the third color light G. In this embodiment, the second color light R and the third color light G provided by the red laser diode 312 and the green laser diode 314 are transmitted along the +z direction. Then, the second color light R is reflected by the reflective element 322 and transmitted along the +y direction to the dichroic mirror 324, passing through the dichroic mirror 324 to continue transmitting in the +y direction. The third color light G is also transmitted in the +y direction after being reflected by the dichroic mirror 324.
[0068] The guiding component 330 is used to guide the first color light B (when leaving the light source module 300) in a first direction (i.e., the +x direction). The guiding component 330 includes a first reflector 336, a second reflector 332, and a third reflector 334, which are sequentially arranged on the transmission path of the first color light B. Figure 2A and 2B As shown, in the z-direction, the heights of the first reflector 336 and the second reflector 332 may, for example, be greater than the height of the third reflector 334; the heights of the reflecting element 322 and the dichroic mirror 324 may, for example, be the same; the heights of the first reflector 336 and the second reflector 332 may, for example, be greater than the heights of the reflecting element 322 and the dichroic mirror 324; the heights of the reflecting element 322 and the dichroic mirror 324 may, for example, be equal to the height of the third reflector 334. The first color light B provided by the blue laser diode 316 is transmitted in the +z direction, but after being reflected by the first reflector 336, it is transmitted in the +x direction. At this time, the height of the first color light B in the z-direction is different from the heights of the second color light R and the third color light G in the z-direction. Therefore, the second reflector 332 and the third reflector 334 are used to shift the first color light B to the same height as the second color light R and the third color light G in the z-direction. That is, the second reflector 332 is used to reflect the first color light B from the first reflector 336 so that the first color light B is transmitted in the -z direction, while the third reflector 334 is used to reflect the first color light B from the second reflector 332 so that the first color light B is transmitted again in the +x direction. In this embodiment, the x, y, and z directions are perpendicular to each other.
[0069] An optical path switching component 400 is disposed on the transmission path of the first color light B from the light source module 300. The optical path switching component 400 includes an electronic control element 410 and an optical plate 420. The electronic control element 410 is connected to the optical plate 420 and controls the deflection of the optical plate 420. When the incident angle of the first color light B onto the optical plate 420 (the angle between the first color light B and the normal of the optical plate 420) is greater than or equal to M degrees, the optical plate 420 allows the first color light B to pass through, or reflects the first color light B. A wavelength conversion component 230 is disposed on the transmission path of the first color light B that passes through the optical plate 420. The wavelength conversion component 230 converts the first color light B into a converted beam C. In this embodiment, the converted beam C is, for example, a yellow beam. In other embodiments, the converted beam C may also be a third color light G, a second color light R, or a combination thereof.
[0070] In this embodiment, the optical characteristics of the optical plate 420 may be such that, when the angle of incidence of the first color light B onto the optical plate 420 is greater than or equal to M degrees, the optical plate 420 allows the first color light B to pass through; when this angle of incidence is less than or equal to N degrees, the optical plate 420 reflects the first color light B. Alternatively, the optical characteristics of the optical plate 420 may also be such that, when the angle of incidence of the first color light B onto the optical plate 420 is greater than or equal to M degrees, the optical plate 420 reflects the first color light B; when this angle of incidence is less than or equal to N degrees, the optical plate 420 allows the first color light B to pass through. The difference between M and N is greater than or equal to 5 degrees to 20 degrees. In this embodiment, the difference between M and N is, for example, greater than or equal to 10 degrees. The optical plate 420 may be an optical glass plate. In other embodiments, the optical plate 420 may also be a plastic plate or a plate made of other transparent materials.
[0071] Figure 5 yes Figure 1A and Figure 1B The graph shows the relationship between the reflectivity of the optical plate and the incident angle of the light beam. Figure 5 In the middle, it is marked as R S The curve is the reflectance curve of S-polarized light relative to optical plate 420, denoted as R. P The curve labeled R is the reflectance curve of P-polarized light relative to optical plate 420, while the curve labeled R is the reflectance curve of unpolarized light relative to optical plate 420. In this embodiment, the first color light B is a beam with a P-polarized state (P-polarized light), and its Brewster angle θ B It is approximately 30–35 degrees (e.g., 32 degrees), while its critical angle θ cFor example, 40 to 45 degrees (e.g., 42 degrees). Therefore, in this embodiment, the range of the M value can be, for example, between 40 and 45 degrees (M value, for example, 42 degrees), and the range of the N value can be, for example, between 30 and 35 degrees (N value, for example, 32 degrees). When the angle of incidence of the first color light B relative to the optical plate 420 is less than or equal to N degrees, for example, the angle of incidence is near the Brewster angle (30 to 35 degrees), it has a very low reflectivity. Therefore, the first color light B will penetrate the optical plate 420 and be transmitted to the wavelength conversion element 230. When the angle of incidence of the first color light B relative to the optical plate 420 is greater than or equal to M degrees, the angle of incidence is greater than or equal to the critical angle. At this time, the first color light B is totally reflected by the optical plate 420 and will not be transmitted to the wavelength conversion element 230. By controlling the tilt of the optical plate 420 by the electronic control element 410, the optical plate 420 can be tilted. Figure 3B and Figure 3C The oscillation state switches between different states, thus ensuring that the angle of incidence is less than or equal to N degrees (e.g., ...). Figure 1A (state) and greater than or equal to M degrees (e.g.) Figure 1B Switching between states, thereby achieving the state where the first color light B is transmitted to the wavelength conversion element 230 (such as...). Figure 1A The state where the first color light B will not be transmitted to the wavelength conversion unit 230 (e.g.) Figure 1B Switching between states.
[0072] In other embodiments, by coating the surface of the optical plate 420 with an interference film, the optical plate 420 can reflect the first color light B when the incident angle of the first color light B relative to the optical plate 420 is less than or equal to N degrees, and allow the first color light B to pass through when the incident angle is greater than or equal to M degrees.
[0073] In this embodiment, the electronic control element 410 includes a first component 412 and a second component 414, respectively disposed at opposite ends of the optical plate 420. The first component 412 and the second component 414 are used to receive different electrical characteristics. In this embodiment, the first component 412 includes a first piezoelectric crystal, and the second component 414 includes a second piezoelectric crystal. The first and second piezoelectric crystals are used to receive one of a first voltage and a second voltage, and the other of the first voltage and the second voltage, respectively, so that one of the first and second piezoelectric crystals is stretched, and the other of the first and second piezoelectric crystals is compressed, thereby causing the optical plate 420 to deflect. The first voltage and the second voltage are, for example, voltages with opposite electrical polarities, one of the first voltage and the other of the second voltage being a positive voltage and the other being a negative voltage. Figure 3A In this configuration, neither the first component 412 nor the second component 414 is subjected to voltage, therefore the heights of the first component 412 and the second component 414 are the same, and the optical plate 420 is parallel to the wavelength conversion element 230. Figure 3B In this process, the first component 412 is stretched by applying a first voltage (e.g., a positive voltage), and the first component 412 drives one end of the optical plate 420 ( Figure 3B The left side of the optical plate 420 is lifted upwards, and the second component 414 is compressed by applying a second voltage (e.g., a negative voltage). The second component 414 drives the other end of the optical plate 420 ( Figure 3B The optical plate 420 moves downwards (to the right) so that the optical plate 420 moves towards... Figure 3B It oscillates clockwise. Figure 3C In the process, the first component 412 is compressed by applying a second voltage, and the second component 414 is stretched by applying a first voltage, thus the optical plate 420 moves towards... Figure 3C The piezoelectric crystal deflects counterclockwise. In this embodiment, the materials of the first and second piezoelectric crystals may include BaTiO3, KNbO3, SiO2, or KH2PO4. The optical path switching component 400 of this embodiment uses a piezoelectric crystal with a fast response speed as the material of the electronic control element 410, thereby quickly switching the deflection angle of the optical plate 420 to change the transmission path of the first color light B at different time sequences. This achieves better image quality by avoiding flicker and color distortion in the optical architecture where the illumination beam 202 of the illumination system 200 originates from the light source module 300 paired with the wavelength conversion element 230.
[0074] In this embodiment, the optical plate 420 tilts about axis A1, and axis A1 is parallel to the wavelength conversion element 230. In one embodiment, the maximum angular difference that the optical plate 420 (at either end) can tilt (e.g. Figure 3B and Figure 3C The angular difference between the two is greater than or equal to 2 degrees to 10 degrees. In this embodiment, the maximum angular difference that the optical plate 420 can swing is, for example, greater than or equal to 5 degrees.
[0075] In this embodiment, the wavelength conversion element 230 is a rotating disk (such as a phosphor wheel) with phosphor 232. Since the illumination system 200 controls whether the first color light B is transmitted to the wavelength conversion element 230 via the optical path switching component 400, the phosphor 232 can be a complete and continuous ring disposed on the surface of the rotating disk (annular phosphor). The first color light B transmitted to the wavelength conversion element 230 will irradiate the phosphor 232, and the rotation speed of the rotating disk can be unrestricted, thus effectively suppressing the noise of the rotating disk. In another embodiment, the wavelength conversion element 230 can also be a fixed component with phosphor. In this embodiment, the phosphor 232 is, for example, a yellow phosphor. In other embodiments, the phosphor 232 can also be a red phosphor, a green phosphor, or a combination thereof. In this embodiment, by means of the wavelength conversion element 230, compared with an illumination system that only uses laser as a light source, the brightness is higher (the brightness is not limited by the packaged light source), and the problem of laser speckle is effectively solved.
[0076] In this embodiment, the lighting system 200 further includes a first beam splitting element 210 located between the wavelength conversion element 230 and the optical path switching element 400. The first beam splitting element 210 is used to allow the first color light B from the optical path switching element 400 to pass through and to reflect the converted beam C from the wavelength conversion element 230.
[0077] In this embodiment, the lighting system 200 further includes a first homogenizing element 220 and a second homogenizing element 240. The first homogenizing element 220 is disposed on the transmission path of the first color light B from the optical path switching component 400, the second color light R from the light source module 300, and the third color light G. The second homogenizing element 240 is disposed on the transmission path of the first color light B, the second color light R, and the third color light G from the first homogenizing element 220, and the converted beam C from the wavelength conversion component 230. The first homogenizing element 220 and the second homogenizing element 240 are each, for example, a lens array, an integration rod, or other optical elements with light homogenization effects. In this embodiment, the first homogenizing element 220 and the second homogenizing element 240 are, for example, a lens array, and the first homogenizing element 220 is used to solve the problem of laser speckle. The second homogenizing element 240 is used to adjust the light patterns of the first color light B, the second color light R, the third color light G, and the converted beam C to conform to the light incident surface shape (e.g., rectangular) of the light valve 110. In other embodiments, the illumination system 200 may also include only a single homogenizing element disposed on the transmission path of the first color light B, the second color light R, the third color light G, and the converted beam C.
[0078] In this embodiment, the lighting system 200 further includes a second beam-splitting element 250, disposed between the light source module 300 and the first light-diffusing element 220, for reflecting the first color light B and allowing the second color light R and the third color light G to pass through, so that the first color light B reflected by the light path switching component 400 and the second color light R and the third color light G from the light source module 300 are all transmitted to the first light-diffusing element 220. In this embodiment, the lighting system 200 also includes a reflector 260, disposed between the light path switching component 400 and the second beam-splitting element 250, for reflecting the first color light B reflected by the light path switching component 400 to the second beam-splitting element 250. In this embodiment, the lighting system 200 further includes a third beam splitter 270, disposed between the first beam splitter 210 and the second beam homogenizer 240. This third beam splitter allows the converted light beam C from the first beam splitter 210 to pass through and be transmitted to the second beam homogenizer 240, and reflects the first color light B, the second color light R, and the third color light G from the first beam homogenizer 220. In this embodiment, the first beam splitter 210, the second beam splitter 250, and the third beam splitter 270 are, for example, dichroic mirrors.
[0079] A light valve 110 is disposed in the transmission path of the illumination beam 202 and is used to convert the illumination beam 202 into an image beam 112. The illumination beam 202 includes at least one of a first color light B, a converted beam C, a second color light R, and a third color light G from the second homogenizing element 240. A projection lens 120 is disposed in the transmission path of the image beam 112 and is used to project the image beam 112 out of the projection device 100 to form a projected image.
[0080] In this embodiment, the illumination system 200 may include a reflector 261 to reflect the first color light B, the second color light R, and the third color light G from the first homogenizing element 220 to the third beam splitter 270. The illumination beam 202 from the second homogenizing element 240 may be reflected by the reflector 262 to the internal total internal reflection prism 263, and then transmitted to the light valve 110 via the internal total internal reflection prism 263. The light valve 110 may be, for example, a digital micromirror device (DMD), a liquid-crystal-on-silicon panel (LCOS panel), or other suitable spatial light modulator, which modulates the illumination beam 202 into an image beam 112. The image beam 112 is then transmitted to the projection lens 120 via the internal total internal reflection prism 263. In each optical path of the illumination system 200 of this embodiment, lenses 264 may be appropriately arranged to improve the transmission quality of each beam. The projection lens 120 may include, for example, a combination of one or more optical lenses with refractive power, such as various combinations of non-planar lenses including biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. In one embodiment, the projection lens 120 may also include an optical reflective lens to project the image beam 112 from the light valve 110 onto the projection target by reflection. The present invention does not limit the type or form of the projection lens 120.
[0081] In the lighting system 200 and projection device 100 of this embodiment, the first color light B can be switched to be transmitted to the wavelength conversion element 230 by controlling the sway of the optical plate 420, which has a simple control structure. This allows for control over the generation of the converted beam C at different time intervals, resulting in a shorter response time (i.e., faster switching) and effectively suppressing color distortion. In one embodiment, the switching frequency of the electronic control element 410 of the optical path switching component 400 can correspond to the response speed of the processor (not shown) of the projection device 100. The switching frequency of the electronic control element 410 can be greater than or equal to 30 Hz, or greater than or equal to 60 Hz, thus effectively suppressing color distortion. Since piezoelectric crystals are high-speed response elements, the required switching frequency can be easily achieved, and the sway of the optical plate 420 generates less noise.
[0082] Figure 6 yes Figure 1A and Figure 1B The timing diagram for the light source module is shown below. Please refer to [the diagram / reference]. Figure 1A , Figure 1B and Figure 6 , Figure 6The diagrams show the output power of red laser diode 312, green laser diode 314, and blue laser diode 316 over time. In this embodiment, during the first time sequence S1 (i.e., within time intervals T1, T2, and T4), the electronic control element 410 of the optical path switching component 400 controls the tilt angle of the optical plate 420 to allow the first color light B from the light source module 300 to penetrate the optical plate 420 and incident on the wavelength conversion element 230 (e.g., ...). Figure 1A (As illustrated). In the second time sequence S2 (that is, in time interval T3), the electronic control element 410 of the optical path switching component 400 is used to control the deflection angle of the optical plate 420 so that the first color light B from the light source module 300 is reflected by the optical plate 420 and does not incident on the wavelength conversion component 230 (as shown). Figure 1B As shown), the first color light B is transmitted to the reflector 260. In this embodiment, during time interval T1, the red laser diode 312 and the blue laser diode 316 are simultaneously turned on, while the green laser diode 314 is turned off. At this time, the second color light R and the converted beam C are transmitted to the second homogenizing element 240. During time interval T2, the green laser diode 314 and the blue laser diode 316 are simultaneously turned on, while the red laser diode 312 is turned off. At this time, the third color light G and the converted beam C are transmitted to the second homogenizing element 240. During time interval T3, the blue laser diode 316 is turned on, and the first color light B is transmitted to the second homogenizing element 240. During time interval T4, the red laser diode 312, the green laser diode 314, and the blue laser diode 316 are simultaneously turned on. At this time, the second color light R, the third color light G, and the converted beam C are transmitted to the second homogenizing element 240. Time intervals T1, T2, T3, and T4 can be repeated sequentially over time. The order in which time intervals T1, T2, T3, and T4 appear is not limited to... Figure 6 What is shown can be in any possible order.
[0083] In another embodiment, the red laser diode 312 and the green laser diode 314 can be turned on simultaneously in the first timing S1 (that is, in the time intervals T1, T2 and T4) to emit the second color light R and the third color light G at the same time, and are turned off only in the second timing S2.
[0084] Figure 7 This is a side view of the light source module according to another embodiment of the present invention, viewed from the -z direction. Please refer to... Figure 7 The light source module 300b in this embodiment can be used to replace Figure 2A and Figure 2B The light source module 300. The light source module 300b of this embodiment is... Figure 2A and Figure 2BSimilar to the light source module 300, the main differences between the two are as follows. In the light source module 300b of this embodiment, the red laser diode 312, the green laser diode 314, and the blue laser diode 316 are located in different packages. In this embodiment, the light source module 300b includes a dichroic mirror 326 and a reflector 328. The dichroic mirror 326 is configured on the transmission path of the second color light R and the third color light G from the red laser diode 312 and the green laser diode 314. The dichroic mirror 326 is used to merge the light paths of the second color light R and the third color light G so that the second color light R and the third color light G are transmitted in the second direction (i.e., the +y direction) to the second beam splitter 250. In this embodiment, the red laser diode 312 emits the second color light R in the +y direction, and then the second color light R passes through the dichroic mirror 326 and continues to be transmitted in the +y direction. The green laser diode 314 emits a third-color light G in the +x direction, which is then reflected by the dichroic mirror 326 and transmitted in the +y direction. In another embodiment, the dichroic mirror 326 may also reflect a second-color light R and allow the third-color light G to pass through, and the positions of the red laser diode 312 and the green laser diode 314 may be interchanged.
[0085] A reflector 328 is positioned in the transmission path of the first color light B from the blue laser diode 316 to reflect the first color light B, thereby causing the first color light B to propagate in the first direction (i.e., the x-direction). In this embodiment, the blue laser diode 216 emits the first color light B in the +y direction, and the reflector 328 reflects the first color light B, thereby causing the first color light B to propagate in the +x direction.
[0086] Figures 8A to 8C They are respectively Figure 1A and Figure 1B Another embodiment of the optical path switching component is shown in side view diagrams in three different states. Please refer to... Figure 1A , Figure 1B , Figures 8A to 8C In this embodiment, the optical path switching component 400a and Figures 3A to 3CSimilar to the optical path switching component 400, the main difference lies in the electronic control element 410a. In the optical path switching component 400a of this embodiment, the electronic control element 410a includes a first component 412a and a second component 414a, respectively disposed at opposite ends of the optical plate 420. The first component 412a includes at least one first coil 4121 and one first fixed magnet 4122, and the second component 414a includes at least one second coil 4141 and one second fixed magnet 4142. The first coil 4121 and the second coil 4141 are used to receive current, so that one of the repulsive force and the attractive force is generated between the first coil 4121 and the first fixed magnet 4122, and the other of the repulsive force and the attractive force is generated between the second coil 4141 and the second fixed magnet 4142, thereby causing the optical plate 420 to deflect. For example, in Figure 8A In this configuration, neither the first coil 4121 nor the second coil 4141 carries current. Therefore, there is no magnetic repulsion or attraction between the first coil 4121 and the first fixed magnet 4122, and similarly, there is no magnetic repulsion or attraction between the second coil 4141 and the second fixed magnet 4142. The heights of the first coil 4121 and the second coil 4141 are the same, and the optical plate 420 is parallel to the wavelength conversion element 230. Figure 8B In the process, current flows through both the first coil 4121 and the second coil 4141. At this time, a magnetic repulsive force is generated between the first coil 4121 and the first fixed magnet 4122, and the first component 412a drives one end of the optical plate 420 ( Figure 8B The left side of the optical plate 420 is raised upwards, and a magnetic attraction is generated between the second coil 4141 and the second fixed magnet 4142. The second component 414a drives the other end of the optical plate 420 ( Figure 8B The right side moves downward, causing the optical plate 420 to tilt clockwise around axis A1. Figure 8C In the middle, the first coil 4121 and the second coil 4141 are connected to... Figure 8BWhen the currents flowing through the first coil 4121 and the first fixed magnet 4122 are in opposite directions, a magnetic attraction is generated between them, and a magnetic repulsion is generated between the second coil 4141 and the second fixed magnet 4142, causing the optical plate 420 to deflect counterclockwise around axis A1. For example, when the N poles of the first fixed magnet 4122 and the second fixed magnet 4142 are in the same direction, the first coil 4121 and the second coil 4141 will have currents flowing through them in opposite directions; for example, the first coil 4121 will have a positive current, and the second coil 4141 will have a negative current. When the N poles of the first fixed magnet 4122 and the second fixed magnet 4142 are in different directions, the first coil 4121 and the second coil 4141 will have currents flowing through them in the same direction; for example, both the first coil 4121 and the second coil 4141 will have positive currents. In another embodiment, the first fixed magnet 4122 and the second fixed magnet 4142 are also replaced by coils.
[0087] In this embodiment, the optical path switching component 400 uses a coil with a fast response speed as the material of the electronic control element 410, which can quickly switch the sway angle of the optical plate 420 to change the transmission path of the first color light B at different times. In the optical architecture where the source of the illumination beam 202 of the illumination system 200 is the light source module 300 and the wavelength conversion component 230, flicker and color distortion can be avoided, so as to provide better image quality.
[0088] In summary, the lighting system and projection device of the embodiments of the present invention have at least one of the following advantages: In the lighting system and projection device of the embodiments of the present invention, when the incident angle of the first color light incident on the optical plate is greater than or equal to M degrees, the optical plate is used to allow the first color light to pass through or reflect the first color light. Therefore, the lighting system and projection device of the embodiments of the present invention can switch the generation of the conversion beam by simply tilting the optical plate, thus having a shorter response time (i.e., faster switching) and effectively suppressing color distortion. The tilting of the optical plate generates less noise, and the use of a wavelength conversion device can also effectively suppress speckle.
[0089] 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, The lighting system includes a light source module, a light path switching component, and a wavelength conversion component, wherein: The light source module is used to emit a first color light, a second color light, and a third color light, wherein the first color light has a polarization state, the first color light is transmitted in a first direction, and the second color light and the third color light are transmitted in a second direction, the first direction being different from the second direction; The optical path switching component is disposed on the transmission path from the first color light. The optical path switching component includes an electronic control element and an optical plate. The electronic control element is connected to the optical plate and is used to control the deflection of the optical plate. When the incident angle of the first color light onto the optical plate is greater than or equal to M degrees, the optical plate allows the first color light to pass through or reflect the first color light. The wavelength conversion element is disposed on the transmission path of the first color light that penetrates the optical plate, and the wavelength conversion element is used to convert the first color light into a converted light beam.
2. The lighting system according to claim 1, characterized in that, In a first time sequence, the first color light penetrates the optical plate and enters the wavelength conversion element; in a second time sequence, the first color light is reflected by the optical plate and does not enter the wavelength conversion element.
3. The lighting system according to claim 1, characterized in that, When the angle of incidence of the first colored light on the optical plate is greater than or equal to M degrees, the optical plate allows the first colored light to pass through; when the angle of incidence is less than or equal to N degrees, the optical plate reflects the first colored light. Alternatively, when the angle of incidence of the first colored light on the optical plate is greater than or equal to M degrees, the optical plate reflects the first colored light; when the angle of incidence is less than or equal to N degrees, the optical plate allows the first colored light to pass through.
4. The lighting system according to claim 3, characterized in that, The difference between M and N is greater than or equal to 5 degrees to 20 degrees.
5. The lighting system according to claim 1, characterized in that, The wavelength conversion element is a fixed element with phosphor or a rotating disk with phosphor.
6. The lighting system according to claim 1, characterized in that, The electronic control element includes a first component and a second component, which are respectively disposed at opposite ends of the optical plate. The first component and the second component are used to receive different electrical characteristics respectively.
7. The lighting system according to claim 6, characterized in that, The first component includes a first piezoelectric crystal, and the second component includes a second piezoelectric crystal. The first piezoelectric crystal and the second piezoelectric crystal are used to receive one of a first voltage and a second voltage and the other of the first voltage and the second voltage, respectively, so that one of the first piezoelectric crystal and the second piezoelectric crystal is stretched and the other of the first piezoelectric crystal and the second piezoelectric crystal is compressed, thereby causing the optical plate to wobble.
8. The lighting system according to claim 7, characterized in that, The materials of the first piezoelectric crystal and the second piezoelectric crystal include BaTiO3, KNbO3, SiO2 or KH2PO4.
9. The lighting system according to claim 1, characterized in that, The electronic control element includes a first component and a second component, which are respectively disposed at opposite ends of the optical plate. The first component includes a first coil and a first fixed magnet, and the second component includes a second coil and a second fixed magnet. The first coil and the second coil are used to receive current so that one of the repulsive force and the first fixed magnet are generated between the first coil and the first fixed magnet, and the other of the repulsive force and the second fixed magnet are generated between the second coil and the second fixed magnet.
10. The lighting system according to claim 1, characterized in that, The optical plate is tilted about an axis, and the axis is parallel to the wavelength conversion element.
11. The lighting system according to claim 1, characterized in that, The maximum angular difference that the optical plate can swing is greater than or equal to 2 degrees to 10 degrees.
12. The lighting system according to claim 1, characterized in that, The lighting system further includes a first beam splitter located between the wavelength conversion element and the optical path switching element. The first beam splitter is used to allow the first color light to pass through and to reflect the converted beam.
13. The lighting system according to claim 1, characterized in that, The lighting system further includes a first light-diffusing element and a second light-diffusing element. The first light-diffusing element is disposed on the transmission path of the first color light, the second color light and the third color light, and the second light-diffusing element is disposed on the transmission path of the first color light, the second color light, the third color light and the converted light beam.
14. The lighting system according to claim 13, characterized in that, The lighting system further includes a second beam splitter, which reflects the first color light and allows the second and third color light to pass through, so as to transmit the first color light reflected by the light path switching component and the second and third color light from the light source module to the first light uniform element.
15. The lighting system according to claim 1, characterized in that, The switching frequency of the electronic control element is greater than or equal to 30 Hz.
16. The lighting system according to claim 1, characterized in that, The light source module includes: A red laser diode, a green laser diode, and a blue laser diode are located in the same package, wherein the blue laser diode is used to emit the first color light, the red laser diode is used to emit the second color light, and the green laser diode is used to emit the third color light; A reflective element and a dichroic mirror, used to transmit the second color light and the third color light in the second direction; and A guiding component for directing the first color light in the first direction.
17. The lighting system according to claim 1, characterized in that, The light source module includes: A red laser diode, used to emit the second color light; A green laser diode, used to emit the third color light; Blue laser diode, used to emit the first color light; A dichroic mirror, used to merge the light paths of the second color light and the third color light so that the second color light and the third color light are transmitted in the second direction; and A reflector is used to reflect the first color light so that the first color light is transmitted in the first direction, wherein the red laser diode, the green laser diode and the blue laser diode are respectively located in different packages.
18. A projection device, characterized in that, The projection device includes an illumination system, a light valve, and a projection lens, wherein: The lighting system is used to provide a light beam, and the lighting system includes a light source module, a light path switching component, and a wavelength conversion component, wherein: The light source module is used to emit light of a first color, a second color, and a third color, wherein the first color has a polarization state, the first color propagates in a first direction, and the second and third colors propagate in a second direction, the first direction being different from the second direction; The optical path switching component is disposed on the transmission path from the first color light. The optical path switching component includes an electronic control element and an optical plate. The electronic control element is connected to the optical plate and is used to control the deflection of the optical plate. When the incident angle of the first color light onto the optical plate is greater than or equal to M degrees, the optical plate allows the first color light to pass through or reflect the first color light. The wavelength conversion element is disposed on the transmission path of the first color light that penetrates the optical plate, and the wavelength conversion element is used to convert the first color light into a converted beam. The light valve is disposed on the transmission path of the illumination beam and is used to convert the illumination beam into an image beam, wherein the illumination beam includes at least one of the first color light, the converted beam, the second color light, and the third color light; and The projection lens is positioned on the transmission path of the image beam to project the image beam out of the projection device.
19. The projection device according to claim 18, characterized in that, The electronic control element includes a first component and a second component, which are respectively disposed at opposite ends of the optical plate. The first component and the second component are used to receive different electrical characteristics respectively.
20. The projection device according to claim 18, characterized in that, The electronic control element includes a first component and a second component, which are respectively disposed at opposite ends of the optical plate. The first component includes a first coil and a first fixed magnet, and the second component includes a second coil and a second fixed magnet. The first coil and the second coil are used to receive current so that one of the repulsive force and the first fixed magnet are generated between the first coil and the first fixed magnet, and the other of the repulsive force and the second fixed magnet are generated between the second coil and the second fixed magnet.
21. The projection device according to claim 18, characterized in that, The light source module includes: A red laser diode, a green laser diode, and a blue laser diode are located in the same package, wherein the blue laser diode is used to emit the first color light, the red laser diode is used to emit the second color light, and the green laser diode is used to emit the third color light; A reflective element and a dichroic mirror, used to transmit the second color light and the third color light in the second direction; and A guiding component for directing the first color light in the first direction.
22. The projection device according to claim 18, characterized in that, The light source module includes: A red laser diode, used to emit the second color light; A green laser diode, used to emit the third color light; Blue laser diode, used to emit the first color light; A dichroic mirror, used to merge the light paths of the second color light and the third color light so that the second color light and the third color light are transmitted in the second direction; and A reflector is used to reflect the first color light so that the first color light is transmitted in the first direction, wherein the red laser diode, the green laser diode and the blue laser diode are respectively located in different packages.