Patent Publication Number: US-2022229354-A1

Title: Wavelength conversion module and projector

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of China application serial no. 202110072577.3, filed on Jan. 20, 2021. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. 
     BACKGROUND 
     Technical Field 
     The disclosure relates to an optical module and a projector, and more particularly, to a wavelength conversion module and a projector having the wavelength conversion module. 
     Description of Related Art 
     In a device of a solid state illumination laser (SSI Laser) projector, a phosphor wheel is located on a transmission path of an exciting beam of a light source module, and a blue laser beam emitted by a blue laser light source is projected on a light conversion region of the phosphor wheel so as to be excited to emit a yellow conversion beam, thereby achieving the purpose of synthesizing white light. In general, a metal weight ring may be additionally assembled to the structure of the phosphor wheel for subsequent balance correction, and the metal weight ring may also be filled with balancing substances or glue, etc. However, the balancing substances or glue filled in/on the metal weight ring may receive the heat energy from the heat dissipation substrate and result in degradation, thereby reducing the reliability of the structure of the phosphor wheel. In addition, the structure of the metal weight ring is more complicated, and the production cost is also higher. The structure of the phosphor wheel may not be simplified due to the limitation of the metal weight ring, which tends to result in vibration and noise during the operation of the phosphor wheel, and thus affects the quality and the service life of the phosphor wheel. 
     The information disclosed in this Background section is only for enhancement of understanding of the background of the described technology and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Further, the information disclosed in the Background section does not mean that one or more problems to be resolved by one or more embodiments of the invention was acknowledged by a person of ordinary skill in the art. 
     SUMMARY 
     The disclosure provides a wavelength conversion module with a higher reliability. 
     The disclosure further provides a projector, which includes the wavelength conversion module, and has a higher reliability and a longer service life. 
     Other objects and advantages of the disclosure may be further understood from the technical features disclosed herein. 
     In order to achieve one, a part, or all of the above objectives or other objectives, an embodiment of the disclosure provides a wavelength conversion module, including a wavelength conversion wheel, a driver, and a weight member. The wavelength conversion wheel includes a rotating plate, and the rotating plate has a first side and a second side opposite to each other. The driver is connected to the first side of the rotating plate, and the driver drives the rotating plate to rotate around a rotation shaft of the driver as an axis. The weight member is attached to the second side of the rotating plate, and the weight member rotates synchronously with the rotating plate around the rotation shaft as the axis. The rotating plate includes a heat insulation region and a heat dissipation region. The heat insulation region and the heat dissipation region do not overlap each other. The heat insulation region includes a first heat insulation region and a second heat insulation region. The first heat insulation region is located at the first side of the rotating plate and corresponds to a connection position of the driver. The second heat insulation region is located at the second side of the rotating plate and corresponds to a connection position of the weight member. 
     In order to achieve one, a part, or all of the above objectives or other objectives, an embodiment of the disclosure provides a wavelength conversion module, including a wavelength conversion wheel and a driver. The wavelength conversion wheel includes a rotating plate. The rotating plate has a first side and a second side opposite to each other, and the rotating plate includes an annular recess hole that is recessed from the second side toward the first side. The driver is connected to the first side of the rotating plate, and the driver drives the rotating plate to rotate around a rotation shaft of the driver as an axis. The rotating plate includes a heat insulation region and a heat dissipation region. The heat insulation region and the heat dissipation region do not overlap each other. The heat insulation region includes a first heat insulation region and a second heat insulation region. The first heat insulation region is located at the first side of the rotating plate and corresponds to a connection position of the driver, while the second heat insulation region corresponds to a position of the annular recess hole. 
     In order to achieve one, a part, or all of the above objectives or other objectives, an embodiment of the disclosure provides a projector, including an illumination module, a light valve, and a projection lens. The illumination module is configured to provide an illumination beam. The illumination module includes a light source device and a wavelength conversion module. The light source device is configured to provide an exciting beam. The wavelength conversion module receives the exciting beam and is disposed on a transmission path of the exciting beam. The illumination beam includes at least a portion of the exciting beam emitted from the wavelength conversion module. The wavelength conversion module includes a wavelength conversion wheel, a driver, and a weight member. The wavelength conversion wheel includes a rotating plate, and the rotating plate has a first side and a second side opposite to each other. The driver is connected to the first side of the rotating plate, and the driver drives the rotating plate to rotate around a rotation shaft of the driver as an axis. The weight member is attached to the second side of the rotating plate, and the weight member rotates synchronously with the rotating plate around the rotation shaft as the axis. The rotating plate includes a heat insulation region and a heat dissipation region. The heat insulation region and the heat dissipation region do not overlap each other. The heat insulation region includes a first heat insulation region and a second heat insulation region. The first heat insulation region is located at the first side of the rotating plate and corresponds to a connection position of the driver, while the second heat insulation region is located at the second side of the rotating plate and corresponds to a connection position of the weight member. The light valve is disposed on a transmission path of the illumination beam to convert the illumination beam into an image beam. The projection lens is disposed on a transmission path of the image beam to project the image beam out of the projector. 
     In order to achieve one, a part, or all of the above objectives or other objectives, an embodiment of the disclosure provides a projector, including an illumination module, a light valve, and a projection lens. The illumination module is configured to provide an illumination beam. The illumination module includes a light source device and a wavelength conversion module. The light source device is configured to provide an exciting beam. The wavelength conversion module is disposed on a transmission path of the exciting beam. The illumination beam includes at least a portion of the exciting beam emitted from the wavelength conversion module. The wavelength conversion module includes a wavelength conversion wheel and a driver. The wavelength conversion wheel includes a rotating plate. The rotating plate has a first side and a second side opposite to each other, and the rotating plate includes an annular recess hole that is recessed from the second side toward the first side. The driver is connected to the first side of the rotating plate, and the driver drives the rotating plate to rotate around a rotation shaft of the driver as an axis. The rotating plate includes a heat insulation region and a heat dissipation region. The heat insulation region and the heat dissipation region do not overlap each other. The heat insulation region includes a first heat insulation region and a second heat insulation region. The first heat insulation region is located at the first side of the rotating plate and corresponds to a connection position of the driver, while the second heat insulation region corresponds to a position of the annular recess hole. The light valve is disposed on a transmission path of the illumination beam to convert the illumination beam into an image beam. The projection lens is disposed on a transmission path of the image beam to project the image beam out of the projector. 
     Based on the above, the embodiments of the disclosure have at least one of the following advantages or effects. In the design of the wavelength conversion module of the disclosure, the rotating plate includes the heat insulation region and the heat dissipation region, and the heat insulation region and the heat dissipation region do not overlap each other. That is, at least two regions with different functional properties of heat insulation and heat dissipation may be disposed on the rotating plate according to requirements, so as to achieve a heat dissipation effect and a heat insulation effect. In addition, the heat insulation region includes the first insulation region located at the first side of the rotating plate and corresponding to the connection position of the driver and the second heat insulation region located at the second side of the rotating plate and corresponding to the connection position of the weight member. In this way, heat energy may be effectively blocked from being transferred to the driver and weight member, which may improve the reliability of the wavelength conversion module of the disclosure. In addition, the projector adopting the wavelength conversion module of the disclosure may have the higher reliability and the longer service life, thereby enhancing the product competitiveness. 
     Other objectives, features and advantages of the present invention will be further understood from the further technological features disclosed by the embodiments of the present invention wherein there are shown and described preferred embodiments of this invention, simply by way of illustration of modes best suited to carry out the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. 
         FIG. 1  is a schematic view of a projector according to an embodiment of the disclosure. 
         FIGS. 2A and 2B  are schematic perspective views of a wavelength conversion module in different viewing angles according to an embodiment of the projector of  FIG. 1 . 
         FIGS. 2C and 2D  are respectively schematic perspective exploded views of the wavelength conversion module of  FIGS. 2A and 2B . 
         FIG. 2E  is a schematic side view of the wavelength conversion module of  FIG. 2A . 
         FIG. 2F  is a schematic cross-sectional view of the wavelength conversion module of  FIG. 2A . 
         FIGS. 3A and 3B  are schematic perspective views of a wavelength conversion module in different viewing angles according to an embodiment of the disclosure. 
         FIGS. 4A and 4B  are schematic perspective exploded views of a wavelength conversion module in different viewing angles according to an embodiment of the disclosure. 
         FIGS. 5A and 5B  are schematic perspective views of a wavelength conversion module in different viewing angles according to an embodiment of the disclosure. 
         FIGS. 5C and 5D  are respectively schematic perspective exploded views of the wavelength conversion module of  FIGS. 5A and 5B . 
         FIG. 5E  is a schematic cross-sectional view of the wavelength conversion module of  FIG. 5A . 
         FIG. 6  is a schematic perspective exploded view of a wavelength conversion module according to an embodiment of the disclosure. 
         FIGS. 7A and 7B  are schematic perspective views of a wavelength conversion module in different viewing angles according to an embodiment of the disclosure. 
         FIGS. 7C and 7D  are respectively schematic perspective exploded views of the wavelength conversion module of  FIGS. 7A and 7B . 
         FIG. 7E  is a schematic cross-sectional view of the wavelength conversion module of  FIG. 7A . 
         FIG. 8  is a schematic perspective exploded view of a wavelength conversion module according to an embodiment of the disclosure. 
         FIG. 9  is a schematic perspective view of a wavelength conversion module according to an embodiment of the disclosure. 
         FIGS. 10A and 10B  are schematic perspective views of a wavelength conversion module in different viewing angles according to an embodiment of the disclosure. 
         FIGS. 10C and 10D  are respectively schematic perspective exploded views of the wavelength conversion module of  FIGS. 10A and 10B . 
         FIG. 10E  is a schematic cross-sectional view of the wavelength conversion module of  FIG. 10A . 
         FIG. 11  is a schematic perspective exploded view of a wavelength conversion module according to an embodiment of the disclosure. 
     
    
    
     DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS 
     In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof, and in which are shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as “top,” “bottom,” “front,” “back,” etc., is used with reference to the orientation of the Figure(s) being described. The components of the present invention can be positioned in a number of different orientations. As such, the directional terminology is used for purposes of illustration and is in no way limiting. On the other hand, the drawings are only schematic and the sizes of components may be exaggerated for clarity. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the present invention. Also, it is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless limited otherwise, the terms “connected,” “coupled,” and “mounted” and variations thereof herein are used broadly and encompass direct and indirect connections, couplings, and mountings. Similarly, the terms “facing,” “faces” and variations thereof herein are used broadly and encompass direct and indirect facing, and “adjacent to” and variations thereof herein are used broadly and encompass directly and indirectly “adjacent to”. Therefore, the description of “A” component facing “B” component herein may contain the situations that “A” component directly faces “B” component or one or more additional components are between “A” component and “B” component. Also, the description of “A” component “adjacent to” “B” component herein may contain the situations that “A” component is directly “adjacent to” “B” component or one or more additional components are between “A” component and “B” component. Accordingly, the drawings and descriptions will be regarded as illustrative in nature and not as restrictive. 
       FIG. 1  is a schematic view of a projector according to an embodiment of the disclosure. Referring to  FIG. 1 , in this embodiment, a projector  10  includes an illumination module  20 , a light valve  30 , and a projection lens  40 . The illumination module  20  is configured to provide an illumination beam L 1 . The illumination module  20  includes a light source device  25  and a wavelength conversion module  100   a . The light source device  25  is configured to provide an exciting beam L′. The wavelength conversion module  100   a  is disposed on a transmission path of the exciting beam L′ and receives the exciting beam L′. The wavelength conversion module  100   a  is configured to convert a wavelength of the exciting beam L′ to generate conversion beams L″ having different wavelengths. Here, the illumination beam L 1  includes at least a portion of the exciting beam L′ and the conversion beam L″ emitted by the wavelength conversion module  100   a . In this embodiment, the exciting beam L′ is, for example, a blue beam, and the conversion beam L″ is, for example, a yellow beam and/or a green beam. The light valve  30  is disposed on a transmission path of the illumination beam L 1  to convert the illumination beam L 1  into an image beam L 2 . The projection lens  40  is disposed on a transmission path of the image beam L 2  to project the image beam L 2  out of the projector  10 . 
     In detail, the light source device  25  used in this embodiment is, for example, a laser diode (LD), such as a laser diode bank. Specifically, any light source that meets the volume requirements according to the actual design may be implemented, and the disclosure is not limited thereto. The light valve  30  is a reflective optical modulator, such as a liquid crystal on silicon panel (LCoS panel) or a digital micro-mirror device (DMD), etc. In an embodiment, the light valve  30  is a transmissive optical modulator, such as a transparent liquid crystal panel, an electro-optical modulator, a magneto-optic modulator, or an acousto-optic modulator (AOM), etc., but the embodiment does not limit forms and the types of the light valve  30 . Regarding the method by which the light valve  30  converts the illumination beam L 1  into the image beam L 2 , detailed steps and embodiments of the method may be sufficiently taught, suggested, and implemented by persons with ordinary knowledge in the art. Thus, details in this regard will not be further reiterated in the following. In addition, the projection lens  40  includes, for example, a combination of one or more optical lenses having a diopter, such as various combinations of non-planar lenses including, for example, biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plane-convex lenses, and plane-concave lenses, etc. In an embodiment, the projection lens  40  may also include a planar optical lens to convert the image beam L 2  from the light valve  30  into a projection beam and project the projection beam out of the projector  10  in a reflective or transmissive manner. Here, the embodiment does not limit forms and types of the projection lens  40 . 
       FIGS. 2A and 2B  are schematic perspective views of a wavelength conversion module in different viewing angles according to an embodiment of the projector of  FIG. 1 .  FIGS. 2C and 2D  are respectively schematic perspective exploded views of the wavelength conversion module of  FIGS. 2A and 2B .  FIG. 2E  is a schematic side view of the wavelength conversion module of  FIG. 2A .  FIG. 2F  is a schematic cross-sectional view of the wavelength conversion module of  FIG. 2A . 
     Referring to  FIGS. 2C, 2D, and 2E  first, the wavelength conversion module  100   a  includes a wavelength conversion wheel  110   a , a driver  120 , and a weight member  130 . The wavelength conversion wheel  110   a  includes a rotating plate  112   a , and the rotating plate  112   a  has a first side  113   a  and a second side  115   a  opposite to each other. Referring to  FIG. 2B , the driver  120  is connected to the first side  113   a  of the rotating plate  112   a , and drives the rotating plate  112   a  to rotate around a rotation shaft X of the driver  120  as an axis. Referring to  2 A, the weight member  130  is attached to the second side  115   a  of the rotating plate  112   a , and the weight member  130  rotate synchronously with the rotating plate  112   a  around the rotation shaft X as the axis. In particular, referring to  FIGS. 2C and 2D  again, the rotating plate  112   a  includes a heat insulation region A 1  and a heat dissipation region A 2 . The heat insulation region A 1  and the heat dissipation region A 2  do not overlap each other. Here, a thermal conductivity of the heat insulation region A 1  of the rotating plate  112   a  is different from a thermal conductivity of the heat dissipation region A 2 . Preferably, the thermal conductivity of the heat insulation region A 1  of the rotating plate  112   a  ranges from 1 W/mK to 180 W/mK. In addition, the heat insulation region A 1  of the rotating plate  112   a  may include a first heat insulation region A 11  and a second heat insulation region A 12 . The first heat insulation region A 11  of the heat insulation region A 1  is located at the first side  113   a  of the rotating plate  112   a  and corresponds to a connection position of the driver  120 , while the second heat insulation region A 12  of the heat insulation region A 1  is located at the second side  115   a  of the rotating plate  112   a  and corresponds to a connection position of the weight member  130 . 
     In detail, referring to  FIGS. 2A, 2B, and 2F , the rotating plate  112   a  of this embodiment is, for example, a metal rotating plate, and a material thereof is aluminum, but the disclosure is not limited thereto. Here, a shape of the rotating plate  112   a  and a shape of the weight member  130  are respectively hollow rings. The rotating plate  112   a  and the weight member  130  are respectively disposed coaxially with the driver  120 . The driver  120  is, for example, a motor, and the weight member  130  is, for example, a metal weight ring, but the disclosure is not limited thereto. 
     Referring to  FIGS. 2A, 2C, and 2E  again, the wavelength conversion wheel  110   a  of this embodiment further includes a wavelength conversion layer  114  and a reflection layer  116 . The wavelength conversion layer  114  is disposed at the second side  115   a  of the rotating plate  112   a , and the reflection layer  116  is disposed at the second side  115   a  of the rotating plate  112   a . The wavelength conversion layer  114  and the reflection layer  116  are both located at the heat dissipation region A 2 , and the reflection layer  116  is located between the rotating plate  112   a  and the wavelength conversion layer  114 . That is, the reflection layer  116  is first disposed at the heat dissipation region A 2  of the rotating plate  112   a , and the wavelength conversion layer  114  is disposed on the reflection layer  116 . Here, the wavelength conversion layer  114  is, for example, a phosphor layer, which is configured to convert the wavelength of the exciting beam L′ in  FIG. 1  and generate the conversion beams L″ having different wavelengths. 
     Furthermore, the wavelength conversion module  100   a  of this embodiment further includes a first heat insulation layer  140  and a second heat insulation layer  150 . As shown in  FIG. 2D , the first heat insulation layer  140  is located at the first heat insulation region A 11  of the rotating plate  112   a  and is disposed between the first side  113   a  of the rotating plate  112   a  and the driver  120 . As shown in  FIG. 2C , the second heat insulation layer  150  is located at the second heat insulation region A 12  of the rotating plate  112   a  and is disposed between the second side  115   a  of the rotating plate  112   a  and the weight member  130 . In an embodiment, the first heat insulation layer  140  and the second heat insulation layer  150  may be respectively, for example, a surface treatment layer. The surface treatment layer includes a ceramization surface layer, a micro-arc oxidation surface layer, an oxide layer, or an inorganic salt layer. In another embodiment, the first heat insulation layer  140  and the second heat insulation layer  150  may also be respectively a coated ceramic material layer, a sprayed ceramic material layer, a printed ceramic material layer, or a printed heat insulation plastic material layer. 
     Furthermore, a surface treatment of the rotating plate  112   a  may achieve functions, such as local intensified heat dissipation, local intensified heat insulation, or local improved reflection, etc., through local surface physical or chemical treatments for material properties of the rotating plate  112   a , or through additional processes such as coating, spraying, or printing, etc. In this embodiment, the heat insulation region A 1  of the rotating plate  112  is subjected to the surface treatment by means of a metal surface micro-arc oxidation (MAO) treatment, a metal surface ceramization treatment, a metal surface modification treatment, etc. The metal surface micro-arc oxidation (MAO) treatment is also known as a micro-plasma oxidation (MPO). In the process of the micro-arc oxidation, a metal base reacts intensely with oxygen ions and electrolyte ions under the combined action of thermochemistry, electrochemistry, and plasma chemistry. Finally, the metal base is cladding on the crystal surface and sintered to form a ceramic layer. A thermal conductivity of the ceramic layer is generally less than 10 W/mK. Compared with a general metal that has a thermal conductivity greater than 50 W/mK (for example, a thermal conductivity of aluminum is greater than 100 W/mK, while a thermal conductivity of copper is greater than 350 W/mK, and a thermal conductivity of iron is greater than 70 W/mK), the ceramic layer generated by the local micro-arc oxidation has the heat insulation effect, and the metal base without the micro-arc oxidation on the local surface may retain the characteristic of the high thermal conductivity on the surface thereof to achieve the function of local heat dissipation. For example, if a material of rotating plate  112   a  is aluminum, a thermal conductivity of the local rotating plate  112   a  may be reduced from 150 W/mK to 220 W/mK to 1 W/mK to 20 W/mK through the function of local micro-arc oxidation. 
     On the other hand, the process and the principle of the metal surface ceramization are similar to those of the micro-arc oxidation. The difference is that the process used in metal surface ceramization is slightly different, but the ultimate goal is to generate the ceramic layer on the local surface of the metal base to achieve the local heat insulation effect. The metal surface modification is to change a surface property of the metal material by forming an oxide film or an inorganic salt cover film through chemical or electrochemical methods. The surface property is to generate the oxide film or the inorganic salt cover layer with the low thermal conductivity, so as to achieve the local heat insulation effect. As for other regions without the surface modification, the original heat dissipation characteristic of the surface of the metal base may be retained. In addition, through the heat insulation surface treatment on the rotating plate  112   a  according to its material property, a porous structure is formed on a surface of the rotating plate  112   a  by the metal surface micro-arc oxidation (MAO) treatment or the surface ceramization treatment. Since voids in the porous structure are occupied by air, and a thermal conductivity of the air is lower than that of the metal, it is equivalent to forming the heat insulation layer on the entire ceramization surface. Alternatively, the surface of the rotating plate  112   a  is treated by other surface modification treatments, for example, the formation of the inorganic salt cover film, etc. Although the porous structure is not necessarily formed on the surface of the rotating plate  112   a , the cover film itself has the lower thermal conductivity. Therefore, it is equivalent to the effect of the heat insulation layer. 
     Compared with the prior art of adding a functional element (for example, a heat dissipation fin is disposed on the rotating plate) to achieve the heat dissipation effect or the heat insulation effect, in this embodiment, the surface treatment is adopted for the rotating plate  112   a  to directly treat the surface of the rotating plate  112   a . Therefore, compared with the prior art, the number of the elements in this embodiment may not be increased, so that the entire thickness may not significantly changed, and the elements are compatible with other existing elements. Therefore, the elements have a positive benefit to the service life and the reliability of the wavelength conversion module  100   a  of this embodiment. 
     In addition, referring to  FIGS. 2C and 2D  again, the wavelength conversion wheel  100   a  of this embodiment further includes a first adhesive layer  160  and a second adhesive layer  165 . The first adhesive layer  160  is disposed between the first side  113   a  of the rotating plate  112   a  and the driver  120 . The driver  120  is fixed on the rotating plate  112   a  through the first adhesive layer  160 . The second adhesive layer  165  is disposed between the second side  115   a  of the rotating plate  112   a  and the weight member  130 . The weight member  130  is fixed on the rotating plate  112   a  through the second adhesive layer  165 . 
     In brief, the rotating plate  112   a  of this embodiment includes the heat insulation region A 1  and the heat dissipation region A 2 , and the heat insulation region A 1  and the heat dissipation region A 2  do not overlap each other. That is, at least two regions with different functional properties of heat insulation and heat dissipation may be disposed on the rotating plate  112   a  according to the requirements, so as to achieve the heat dissipation effect and heat insulation effect at the same time on the rotating plate. Furthermore, the heat insulation region A 1  includes the first heat insulation region A 11  located at the first side  113   a  of the rotating plate  112   a  and corresponding to the connection position of the driver  120 , and the second heat insulation region A 12  located at the second side  115   a  of the rotating plate  112   a  and corresponding to the connection position of the weight member  130 . In this way, heat energy from the wavelength conversion layer  114  may be effectively blocked from being transferred to the driver  120  and the weight member  130 , so as to prevent a filler (not shown) on the weight member  130  and an element of the driver  120  from being degraded and the service life from being shortened due to the heat, which may improve the reliability of the wavelength conversion module  100   a  of this embodiment. In addition, the projector adopting the wavelength conversion module of the embodiment may have a higher reliability and a longer service life, thereby enhancing the product competitiveness. 
     Here, it should be noted that reference numerals and a part of the content of the foregoing embodiments are used in the following embodiments. The same reference numerals are used to represent the same or similar elements, and the description of the same technical content is omitted. The description of the omitted parts may refer to the foregoing embodiments, and the same details will not be repeated in the following embodiments. 
       FIGS. 3A and 3B  are schematic perspective views of a wavelength conversion module in different viewing angles according to an embodiment of the disclosure. Referring to  FIGS. 2A, 2B, 3A, and 3B , a wavelength conversion module  100   b  of this embodiment is similar to the wavelength conversion module  100   a  of  FIGS. 2A and 2B . The difference between the two embodiments is that, in this embodiment, a rotating plate  112   b  of a wavelength conversion wheel  110   b  further includes multiple disturbing portions  117  located in the heat dissipation region A 2 . The disturbing portions  117  correspond to a surface of the heat dissipation region A 2  and are recessed in the rotating plate  112   b . In other words, in this embodiment, a surface area is increased through the disturbing portions  117 , so as to improve the heat dissipation effect of the heat dissipation region A 2  of the rotating plate  112   b . In addition, the disturbing portions  117  may be uniformly disposed in the heat dissipation region A 2  or unevenly disposed in the heat dissipation region A 2 , and the disclosure does not limit the disposition density. In other embodiments, the disturbing portions corresponding to the surface of the heat dissipation region may also protrude from the rotating plate. Here, as long as the function of the disturbing portions may be achieved, the embodiment does not limit whether the disturbing portions are recessed in or protrude from the rotating plate. 
       FIGS. 4A and 4B  are schematic perspective exploded views of a wavelength conversion module in different viewing angles according to an embodiment of the disclosure. Referring to  FIGS. 2A, 2B, 4A, and 4B , a wavelength conversion module  100   c  of this embodiment is similar to the wavelength conversion module  100   a  of  FIGS. 2A and 2B . The difference between the two embodiments is that, in this embodiment, the wavelength conversion module  100   c  further includes a heat dissipation layer  170 . The heat dissipation layer  170  is disposed on the rotating plate  112   a  and is located at the heat dissipation region A 2 . Preferably, the heat dissipation layer  170  is a material having a high thermal conductivity. Here, the heat dissipation layer  170  may be formed by coating a high thermal conductivity material. The high thermal conductivity material is, for example, graphite, diamond, silver, copper, or aluminum, etc. In other words, in this embodiment, the heat dissipation layer  170  is coated on the rotating plate  112   a , so as to improve the heat dissipation effect of the heat dissipation region A 2  of the rotating plate  112   a.    
       FIGS. 5A and 5B  are schematic perspective views of a wavelength conversion module in different viewing angles according to an embodiment of the disclosure.  FIGS. 5C and 5D  are respectively schematic perspective exploded views of the wavelength conversion module of  FIGS. 5A and 5B .  FIG. 5E  is a schematic cross-sectional view of the wavelength conversion module of  FIG. 5A . 
     Referring to  FIGS. 5A, 5B, and 5E , a wavelength conversion module  100   d  of this embodiment includes a wavelength conversion wheel  110   d  and a driver  120 . In detail, referring to  FIGS. 5C and 5D , the wavelength conversion wheel  110   d  includes a rotating plate  112   d . The rotating plate  112   d  has a first side  113   d  and a second side  115   d  opposite to each other, and the rotating plate  112   d  includes an annular recess hole  119  that is recessed from the second side  115   d  toward the first side  113   d . The driver  120  is connected to the first side  113   d  of the rotating plate  112   d , and the driver  120  may drive the rotating plate  112   d  to rotate around a rotation shaft X of the driver  120  as an axis. In particular, the rotating plate  112   d  includes a heat insulation region B 1  and a heat dissipation region B 2 . The heat insulation region B 1  and the heat dissipation region B 2  do not overlap each other. In addition, the heat insulation region B 1  further includes a first heat insulation region B 11  and a second heat insulation region B 12 . The first heat insulation region B 11  is located at the first side  113   d  of the rotating plate  112   d  and corresponds to a connection position of the driver  120 , while the second heat insulation region B 12  corresponds to a position of the annular recess hole  119 . 
     Referring to both  FIGS. 5A and 5C  again, a wavelength conversion wheel  110   d  of this embodiment further includes a wavelength conversion layer  114  and a reflection layer  116 . The wavelength conversion layer  114  is disposed at the second side  115   d  of the rotating plate  112   d , and the reflection layer  116  is disposed at the second side  115   d  of the rotating plate  112   d . The wavelength conversion layer  114  and the reflection layer  116  are both located at the heat dissipation region B 2 , and the reflection layer  116  is located between the rotating plate  112   d  and the wavelength conversion layer  114 . That is, the reflection layer  116  is first disposed at the heat dissipation region B 2  of the rotating plate  112   d , and the wavelength conversion layer  114  is disposed on the reflection layer  116 . Here, the wavelength conversion layer  114  is, for example, a phosphor layer, which is configured to convert the wavelength of the exciting beam L′ in  FIG. 1  and to generate the conversion beams L″ having different wavelengths. In other words, the projector  10  in  FIG. 1  may also adopt the wavelength conversion module  100   d  of this embodiment. Referring to  FIGS. 2A, 2C, and 2E  optionally, the wavelength conversion module  100   d  further includes a filler  180  disposed in the annular recess hole  119  of the rotating plate  112   d , so as to correct the balance when the wavelength conversion module  100   d  is rotated. 
     In addition, referring to  FIGS. 5A and 5B , the wavelength conversion wheel  110   d  of this embodiment further includes a first heat insulation layer  140   d  and a second heat insulation layer  150   d . As shown in  FIG. 5D , the first heat insulation layer  140   d  is located at the first heat insulation region B 11  of the rotating plate  112   d  and is disposed between the first side  113   d  of the rotating plate  112   d  and the driver  120 . As shown in  FIG. 5C , the second heat insulation layer  150   d  is located at the second heat insulation region B 12  of the rotating plate  112   d  and is disposed at the second side  115   d  of the rotating plate  112   d . In an embodiment, the first heat insulation layer  140   d  and the second heat insulation layer  150   d  may be respectively, for example, a surface treatment layer. The surface treatment layer includes a ceramization surface layer, a micro-arc oxidation surface layer, an oxide layer, or an inorganic salt layer. In another embodiment, the first heat insulation layer  140   d  and the second heat insulation layer  150   d  may also be respectively a coated ceramic material layer, a sprayed ceramic material layer, a printed ceramic material layer, or a printed heat insulation plastic material layer. 
     In brief, the wavelength conversion module  100   d  of this embodiment is not provided with the weight member  130  in  FIG. 2A , but the weight member  130  is replaced by the annular recess hole  119  integrally formed with the rotating plate  112   d . It is also possible to correct the balance of the wavelength conversion module  100   d  when the wavelength conversion module  100   d  is rotated by disposing the filler  180  in the annular recess hole  119  of the rotating plate  112   d . In this way, the cost of the wavelength conversion module  100   d  may be reduced, so that the structure of the wavelength conversion module  100   d  is simplified. The vibration and the noise generated during the operation of the wavelength conversion module  100   d  may also be avoided, which may improve the reliability and the service life of the wavelength conversion module  100   d.    
       FIG. 6  is a schematic perspective exploded view of a wavelength conversion module according to an embodiment of the disclosure. Referring to both  FIGS. 5C and 6 , a wavelength conversion module  100   e  of this embodiment is similar to the wavelength conversion module  100   d  of  FIG. 5C . The difference between the two embodiments is that, in this embodiment, the wavelength conversion module  100   e  further includes an auxiliary reflection layer  185   e . The auxiliary reflection layer  185   e  is disposed between the reflection layer  116  and the rotating plate  112   d , and is located at the heat dissipation region B 2 . Preferably, the auxiliary reflection layer  185   e  is, for example, a surface treatment reflection layer, a coated reflection layer, a sprayed reflection layer, or a printed reflection layer, which may improve a reflectivity of the wavelength conversion module  100   e.    
       FIGS. 7A and 7B  are schematic perspective views of a wavelength conversion module in different viewing angles according to an embodiment of the disclosure.  FIG. 7C  and  FIG. 7D  are respectively schematic perspective exploded views of the wavelength conversion module of  FIGS. 7A and 7B .  FIG. 7E  is a schematic cross-sectional view of the wavelength conversion module of  FIG. 7A . Referring to  FIGS. 5A, 5B, 7A, 7B, and 7E , a wavelength conversion module  100   f  of this embodiment is similar to the wavelength conversion module  100   d  of  FIGS. 5A and 5B . The difference between the two embodiments is that, in this embodiment, a rotating plate  112   f  of a wavelength conversion wheel  110   f  further includes multiple first disturbing portions  117   f  and multiple second disturbing portions  118   f . In detail, as shown in  FIGS. 7B and 7D , the first disturbing portions  117   f  are disposed at a first side  113   f  of the rotating plate  112   f , and are located in the heat dissipation region B 2 . The first disturbing portions  117   f  are recessed in a surface of the first side  113   f . As shown in  FIGS. 7A and 7C , the second disturbing portions  118   f  are disposed at a second side  115   f  of the rotating plate  112   f , and are located in the heat dissipation region B 2  outside the reflection layer  116 . The second disturbing portions  118   f  are recessed in a surface of the second side  115   f . In other words, in this embodiment, the surface area is increased through the first disturbing portions  117   f  and the second disturbing portions  118   f , so as to improve the heat dissipation effect of the heat dissipation region B 2  of the rotating plate  112   f.    
       FIG. 8  is a schematic perspective exploded view of a wavelength conversion module according to an embodiment of the disclosure. Referring to both  FIGS. 7C and 8 , a wavelength conversion module  100   g  of this embodiment is similar to the wavelength conversion module  100   f  of  FIG. 7C . The difference between the two embodiments is that, in this embodiment, the wavelength conversion module  100   g  further includes an auxiliary reflection layer  185   g . The auxiliary reflection layer  185   g  is disposed between the reflection layer  116  and the rotating plate  112   f , and is located at the heat dissipation region B 2 . Preferably, the auxiliary reflection layer  185   g  is, for example, a surface treatment reflection layer, a coated reflection layer, a sprayed reflection layer, or a printed reflection layer, which may improve a reflectivity of the wavelength conversion module  100   g.    
       FIG. 9  is a schematic perspective view of a wavelength conversion module according to an embodiment of the disclosure. Referring to both  FIGS. 7A and 9 , a wavelength conversion module  100   h  of this embodiment is similar to the wavelength conversion module  100   f  of  FIG. 7A . The difference between the two embodiments is that, in this embodiment, multiple second disturbing portions  118   h  are disposed at a second side  115   h  of a rotating plate  112   h  of a wavelength conversion wheel  110   h , and are located in the heat dissipation region B 2  outside the reflection layer  116 . The second disturbing portions  118   h  protrude from a surface of the second side  115   h  of the rotating plate  112   h.    
       FIGS. 10A and 10B  are schematic perspective views of a wavelength conversion module in different viewing angles according to an embodiment of the disclosure.  FIGS. 10C and 10D  are respectively schematic perspective exploded views of the wavelength conversion module of  FIGS. 10A and 10B .  FIG. 10E  is a schematic cross-sectional view of the wavelength conversion module of  FIG. 10A . Referring to  FIGS. 7A, 7B, 10A, 10B, and 10E , a wavelength conversion module  100   i  of this embodiment is similar to the wavelength conversion module  100   f  of  FIGS. 7A and 7B . The difference between the two embodiments is that, in this embodiment, the wavelength conversion module  100   i  further includes a first coating layer  190  and a second coating layer  195 . In detail, referring to both  FIGS. 10B and 10D , the first coating layer  190  is disposed on a surface of a first side  113   i  of a rotating plate  112   i  and covers multiple first disturbing portions  117   i . Referring to both  FIGS. 10A and 10C , the second coating layer  195  is disposed on a surface of a second side  115   i  of the rotating plate  112   i  and covers multiple second disturbing portions  118   i . Here, the first disturbing portions  117   i  are recessed in the surface of the first side  113   i  of the rotating plate  112   i , and the second disturbing portions  118   i  protrude from the surface of the second side  115   i  of the rotating plate  112   i . However, the disclosure is not limited thereto. Preferably, a thermal conductivity of the first coating layer  190  and a thermal conductivity of the second coating layer  195  are respectively at least greater than 200 W/mK. Here, a material of the first coating layer  190  and a material of the second coating layer  195  respectively include graphite, diamond, gold, silver, copper, or aluminum, etc. In other words, in this embodiment, the surface area is increased through the first disturbing portions  117   i  and the second disturbing portions  118   i , and the heat dissipation effect of the heat dissipation region B 2  of the rotating plate  112   i  is improved through the disposition of the first coating layer  190  and the second coating layer  195 . 
       FIG. 11  is a schematic perspective exploded view of a wavelength conversion module according to an embodiment of the disclosure. Referring to both  FIGS. 5C and 11 , a wavelength conversion module  100   j  of this embodiment is similar to the wavelength conversion module  100   d  of  FIG. 5C . The difference between the two embodiments is that, in this embodiment, the wavelength conversion module  100   j  further includes a heat dissipation layer  170   j . The heat dissipation layer  170   j  is disposed on the rotating plate  112   d , and is located at the heat dissipation region B 2 . Preferably, the heat dissipation layer  170   j  is a material having a high thermal conductivity. Here, the heat dissipation layer  170   j  may be formed by coating a high thermal conductivity material. The high thermal conductivity material is, for example, graphite, diamond, silver, copper, or aluminum, etc. In other words, in this embodiment, the heat dissipation layer  170   j  is coated on the rotating plate  112   d , so as to improve the heat dissipation effect of the heat dissipation region B 2  of the rotating plate  112   d.    
     Based on the above, the embodiments of the disclosure have at least one of the following advantages or effects. In the design of the wavelength conversion module of the disclosure, the rotating plate includes the heat insulation region and the heat dissipation region, and the heat insulation region and the heat dissipation region do not overlap each other. That is, at least two regions with different functional properties of heat insulation and heat dissipation may be disposed on the rotating plate according to the requirements, so as to achieve the heat dissipation effect and heat insulation effect. Furthermore, the heat insulation region further includes the first heat insulation region located on the first side of the rotating plate and corresponding to the connection position of the driver and the second heat insulation region located on the second side of the rotating plate and corresponding to the connection position of the weight member. In this way, the heat energy may be effectively blocked from being transferred to the driver and the weight member, which may improve the reliability of the wavelength conversion module of the disclosure. In addition, the wavelength conversion module of the disclosure may also replace the weight member with the annular recess hole integrally formed with the rotating plate. In this way, the cost of the wavelength conversion module may be reduced, so that the structure of the wavelength conversion module is simplified. The vibration and the noise generated during the operation of the wavelength conversion module may also be avoided, which may improve the reliability and the service life of the wavelength conversion module. In addition, the projector adopting the wavelength conversion module of the disclosure may have the higher reliability and the longer service life, thereby enhancing the product competitiveness. 
     The foregoing description of the preferred embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form or to exemplary embodiments disclosed. Accordingly, the foregoing description should be regarded as illustrative rather than restrictive. Obviously, many modifications and variations will be apparent to practitioners skilled in this art. The embodiments are chosen and described in order to best explain the principles of the invention and its best mode practical application, thereby to enable persons skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use or implementation contemplated. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents in which all terms are meant in their broadest reasonable sense unless otherwise indicated. Therefore, the term “the invention”, “the present invention” or the like does not necessarily limit the claim scope to a specific embodiment, and the reference to particularly preferred exemplary embodiments of the invention does not imply a limitation on the invention, and no such limitation is to be inferred. The invention is limited only by the spirit and scope of the appended claims. The abstract of the disclosure is provided to comply with the rules requiring an abstract, which will allow a searcher to quickly ascertain the subject matter of the technical disclosure of any patent issued from this disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Any advantages and benefits described may not apply to all embodiments of the invention. It should be appreciated that variations may be made in the embodiments described by persons skilled in the art without departing from the scope of the present invention as defined by the following claims. Moreover, no element and component in the present disclosure is intended to be dedicated to the public regardless of whether the element or component is explicitly recited in the following claims.