Patent Publication Number: US-2023141316-A1

Title: Color wheel module and projection device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of China application serial no. 202111331055.7, filed on Nov. 11, 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 projection device, and more particularly to a color wheel module and a projection device using the color wheel module. 
     Description of Related Art 
     At present, a wavelength conversion region of a phosphor wheel of a projector is usually provided on a plane of a heat dissipation substrate, where the plane in a radial direction and the rotating axis of the phosphor wheel are perpendicular to each other, and the wavelength conversion region is provided in a ring shape around the rotating axis. Some phosphor wheels are also provided with a filter area on the plane in a radial direction of the heat dissipation substrate, where the filter area is also provided in a ring shape around the rotating axis such that the phosphor wheel also can also function as a filter wheel. 
     However, because the wavelength conversion region is usually provided on the plane in the radial direction of the heat dissipation substrate at present, the space allocation flexibility of the phosphor wheel in the projector&#39;s optical engine is limited and the optical path of the incident light and the output light of the wavelength conversion region may only be arranged in the direction parallel to the axial direction, which greatly reduces the space arrangement of the projector&#39;s optical engine. Moreover, the wavelength conversion layers disposed in the wavelength conversion region generate a large amount of heat after being excited by the excitation light during the operation period of the projector. The heat needs to be withdrew through the heat dissipation substrate to reduce the temperature of the wavelength conversion layers and improve the excitation efficiency of the wavelength conversion layers. Furthermore, the heat dissipation efficiency of the wavelength conversion layers is related to the location of the heat dissipation substrate which the wavelength conversion layer are disposed at. The closer to the outer diameter of the heat dissipation substrate, the higher the linear velocity of the phosphor wheel when rotating, and therefore the better the heat dissipation efficiency of the phosphor wheel. However, currently the average position of the wavelength conversion layers in the phosphor wheel cannot be provided on the outermost outer diameter of the heat dissipation substrate, thus making the heat dissipation effect of the phosphor wheel limited. Moreover, different wavelength conversion layers on the same plane cannot be excited at the same time, but must be separately excited at different timings through timing control, which results in poor excitation efficiency and poor heat dissipation. 
     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 disclosure was acknowledged by a person of ordinary skill in the art. 
     SUMMARY 
     The disclosure provides a color wheel module that has better heat dissipation effect. 
     The disclosure further provides a projection device, which includes the color wheel module and has better projection quality and product competitiveness. 
     Other objectives and advantages of the disclosure may be further understood from the technical features disclosed herein. 
     An embodiment of the disclosure provides a color wheel module, disposed on a transmission path of an excitation beam. The color wheel module includes a driving assembly, a substrate, a fastening element, at least one wavelength conversion layer, and a plurality of filters. The filters are disposed around a rotating axis in a manner perpendicular to the rotating axis of the driving assembly. The fastening element is attached to the filters along the rotating axis. The substrate is connected to the filters, and the filters are fixed between the fastening element and the driving assembly. The driving assembly drives the substrate and the filters to rotate with the rotating axis as a central axis. The substrate includes an outer periphery surrounding the central axis, the substrate includes a light conversion region located on the outer periphery, and the outer periphery extends in an extension direction. The extension direction and a radial direction of the substrate form an included angle, and the outer periphery has a width parallel to the extension direction. The wavelength conversion layers are disposed in the light conversion region of the substrate. The excitation beam is incident on the light conversion region of the substrate and converted into a conversion beam, and the conversion beam is guided to penetrate the corresponding filter along a direction parallel to the central axis. 
     An embodiment of the disclosure provides a projection device including an illumination module, a light valve, and a projection lens. The illumination module includes a light source device, a light-guiding element, and a color wheel module providing an illumination beam. The light source device is configured to provide an excitation beam. The color wheel module is disposed on a transmission path of the excitation beam. The color wheel module is located between the light source device and the light valve, and the color wheel module includes a driving assembly, a substrate, a fastening element, at least one wavelength conversion layer, and a plurality of filters. The filters are disposed around a rotating axis in a manner perpendicular to the rotating axis of the driving assembly. The fastening element is attached to the filters along the rotating axis. The substrate is connected to the filters, and the filters are fixed between the fastening element and the driving assembly. The driving assembly drives the substrate and the filters to rotate around the rotating axis as a central axis. The substrate includes an outer periphery surrounding the central axis, and the substrate includes a light conversion region located on the outer periphery. The outer periphery extends in an extension direction. The extension direction and a radial direction of the substrate form an included angle, and the outer periphery has a width parallel to the extension direction. The wavelength conversion layers are disposed in the light conversion region of the substrate. The excitation beam is incident on the light conversion region of the substrate and converted into a conversion beam, and the conversion beam is guided by the light-guiding element to penetrate the corresponding filter along a direction parallel to the central axis. The illumination beam includes the conversion beam. 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 projection device. 
     In summary, the embodiments of the disclosure have at least one of the following advantages or effects. In the design of the color wheel module of the disclosure, the light conversion region is located on the outer periphery of the substrate that is not parallel to the radial direction, the filters are disposed around the rotating axis in a manner perpendicular to the rotating axis of the driving assembly, and the wavelength conversion layers are disposed on the light conversion region on the outer periphery of the substrate. The excitation beam is incident perpendicularly or obliquely on the light conversion region of the outer periphery of the substrate and converted into a conversion beam, and the conversion beam is guided to penetrate the corresponding filters along a direction parallel to the central axis. Thereby, the heat dissipation efficiency and wavelength conversion efficiency of the wavelength conversion layers can be improved, such that the color wheel module of the disclosure has a better heat dissipation effect. Furthermore, with the configuration method, it is possible to increase the flexibility in the space design of the optical engine. In addition, the projection device using the color wheel module of the disclosure can have better projection quality and product competitiveness. 
     Other objectives, features and advantages of the disclosure will be further understood from the further technological features disclosed by the embodiments of the disclosure wherein there are shown and described exemplary of this disclosure, simply by way of illustration of modes best suited to carry out the disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of the disclosure. The drawings illustrate embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure. 
         FIG.  1    is a schematic view of a projection device according to an embodiment of the disclosure. 
         FIG.  2 A  is a schematic top view of the relative position of the color wheel module and the light-guiding element of the projection device of  FIG.  1   . 
         FIG.  2 B  is a three-dimensional exploded schematic view of the color wheel module of  FIG.  2 A . 
         FIG.  2 C  is a three-dimensional schematic view of the relative position of the color wheel module and the light-guiding element of  FIG.  2 A . 
         FIG.  2 D  is a three-dimensional schematic view of the relative position of the color wheel module and the light-guiding element of  FIG.  2 C  from another viewing angle. 
         FIG.  2 E  is a schematic side view of the relative position of the color wheel module and the light-guiding element of  FIG.  2 A . 
         FIG.  2 F  is a schematic side view of the relative position of the color wheel module and the light-guiding element of  FIG.  2 A  from another viewing angle. 
         FIG.  3 A  is a schematic top view of the relative position of a color wheel module and a light-guiding element according to an embodiment of the disclosure. 
         FIG.  3 B  is a three-dimensional exploded schematic view of the color wheel module of  FIG.  3 A . 
         FIG.  3 C  is a perspective schematic view of the relative position of the color wheel module and the light-guiding element of  FIG.  3 A . 
         FIG.  3 D  is a three-dimensional schematic view of the relative position of the color wheel module and the light-guiding element in  FIG.  3 C  from another viewing angle. 
         FIG.  3 E  is a schematic side view of the relative position of the color wheel module and the light-guiding element of  FIG.  3 A . 
         FIG.  3 F  is a three-dimensional schematic view of the relative position of the color wheel module and the light-guiding element of  FIG.  3 A  from another viewing angle. 
         FIG.  3 G  is a three-dimensional schematic view of the relative position of the color wheel module and the light-guiding element in  FIG.  3 F  from another viewing angle. 
         FIG.  3 H  is a schematic side view of the relative position of the color wheel module and the light-guiding element of  FIG.  3 A  from another viewing angle. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     In the following detailed description of the exemplary 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 disclosure 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 disclosure 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 disclosure. 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 projection device according to an embodiment of the disclosure.  FIG.  2 A  is a schematic top view of the relative position of the color wheel module and the light-guiding element of the projection device of  FIG.  1   .  FIG.  2 B  is a three-dimensional exploded schematic view of the color wheel module of  FIG.  2 A .  FIG.  2 C  is a three-dimensional schematic view of the relative position of the color wheel module and the light-guiding element of  FIG.  2 A .  FIG.  2 D  is a three-dimensional schematic view of the relative position of the color wheel module and the light-guiding element of  FIG.  2 C  from another viewing angle.  FIG.  2 E  is a schematic side view of the relative position of the color wheel module and the light-guiding element of  FIG.  2 A .  FIG.  2 F  is a schematic side view of the relative position of the color wheel module and the light-guiding element of  FIG.  2 A  from another viewing angle. 
     Referring to  FIG.  1    and  FIG.  2 C  first, in this embodiment, a projection device  10  includes an illumination module  12 , a light valve  14  and a projection lens  16 . The illumination module  12  includes a light source device  13 , a light-guiding element  15 , and a color wheel module  100   a.  The illumination module  12  is configured to provide an illumination beam L 1 . The light source device  13  is configured to provide an excitation beam L′. The color wheel module  100   a  is disposed on a transmission path of the excitation beam L′ emitted from the light source device  13 . The color wheel module  100   a  is located between the light source device  13  and the light valve  14 . The light valve  14  is disposed on a transmission path of the illumination beam L 1  so as to convert the illumination beam L 1  into an image beam L 2 . The projection lens  16  is disposed on a transmission path of the image beam L 2  transmitted from the light valve  14  so as to project the image beam L 2  out of the projection device  10  and form an image (not shown) on a projection plane. 
     Furthermore, the light source device  13  used in this embodiment may be, for example, at least one Laser Diode (LD), or, for example, a Laser Diode Bank. Specifically, any light source that meets the volume requirement in actual design may be implemented, and the disclosure is not limited thereto. The light valve  14  may be, for example, a reflective light modulator such as a Liquid Crystal On Silicon panel (LCoS panel) or a Digital Micro-mirror Device (DMD). In one embodiment, the light valve  14  may be, for example, a Transparent Liquid Crystal Panel, an Electro-Optical Modulator, a Magneto-Optical modulator, an Acousto-Optical Modulator (AOM), or other transmissive optical modulators, but the type of the light valve  14  is not limited in this embodiment. The detailed steps and implementation of the method by which the light valve  14  converts the illumination beam L 1  into the image beam L 2  can be adequately taught, suggested, and implemented by general knowledge and therefore will not be repeated. The light-guiding element  15  includes, for example, a plurality of reflection mirrors  15   a,  a first light-collecting lens  15   b,  and a second light-collecting lens  15   c,  but the disclosure is not limited thereto. Moreover, the projection lens  16  includes, for example, a combination of one or more optical lenses having a refractive power, including, for example, various combinations of non-planar lenses such as biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. In an embodiment, the projection lens  16  may also include a flat optical lens that receives the image beam L 2  from the light valve  14  and projects it out of the projection device  10  in a reflective or penetrating manner. Herein, the type of the projection lens  16  is not limited in this embodiment. 
     Referring to  FIG.  2 A ,  FIG.  2 B ,  FIG.  2 C ,  FIG.  2 D ,  FIG.  2 E , and  FIG.  2 F  at the same time, in this embodiment, the color wheel module  100   a  includes a driving assembly  110 , a substrate  120   a,  a fastening element  130 , at least one wavelength conversion layer (yellow wavelength conversion layers  142  and a green wavelength conversion layer  144  are schematically shown), and a plurality of filters  150  (four filters  150  are shown schematically). The filters  150  are disposed around a rotating axis X of the driving assembly  110  in a manner perpendicular to the rotating axis X. The fastening element  130  is attached to the filters  150  along the rotating axis X. The substrate  120   a  is connected to the filters  150 , and the filters  150  are fixed between the fastening element  130  and the driving assembly  110 . The driving assembly  110  drives the substrate  120   a  and the filters  150  to rotate around the rotating axis X as a central axis C; the central axis C may be, for example, the rotation center line of the substrate  120   a.  The substrate  120   a  includes an outer periphery  125  surrounding the central axis C, and the substrate  120   a  includes a light conversion region A 1  located on the outer periphery  125 . The outer periphery  125  extends in an extension direction D. The extension direction D and a radial direction R of the substrate  120   a  form an included angle a, and the outer periphery  125  has a width W parallel to the extension direction D, in which the radial direction R is perpendicular to the central axis C. The included angle a may be, for example, greater than 0 degree and less than or equal to 90 degrees. Preferably, the outer periphery  125  is 90 degrees to the radial direction R (the included angle a is 90 degrees); that is, the extension direction D of the outer periphery  125  is parallel to the central axis C. The yellow wavelength conversion layers  142  and the green wavelength conversion layer  144  are disposed in the light conversion region A 1  of the substrate  120   a,  wherein the width of the light conversion region A 1  on the outer periphery  125  may be less than or equal to the width W of the outer periphery  125  parallel to the extension direction D. 
     Furthermore, in this embodiment, the shape of the substrate  120   a  and the shape of the fastening element  130  are hollow rings, respectively, wherein the substrate  120   a  and the fastening element  130  are provided coaxially with the driving assembly  110 , respectively. Here, the substrate  120   a  is disposed around outer edges of the filters  150 . The substrate  120   a  further includes a non-conversion region A 2  located on the outer periphery  125 , and the light conversion region A 1  and the non-conversion region A 2  are adjacently disposed on the outer periphery  125 . The substrate  120   a  may be a transparent substrate with high thermal conductivity or an opaque substrate with high thermal conductivity. The material of the substrate  120   a  may be, for example, sapphire, aluminum nitride, aluminum oxide, ceramic composite material, or metal alloy, but the disclosure is not limited thereto. Furthermore, the color wheel module  100   a  of this embodiment further includes a reflective layer  160   a,  wherein the reflective layer  160   a  is disposed in the light conversion region A 1  and the non-conversion region A 2  of the substrate  120   a.  Here, the reflective layer  160   a  has a ring structure, and part of the reflective layer  160   a  is located between the yellow wavelength conversion layers  142  and the outer periphery  125  and between the green wavelength conversion layer  144  and the outer periphery  125 . The reflective layer  160   a  may be a coated mirror reflective layer, a coated diffuse reflection layer, or a composite of the above two types of coatings or layers. 
     Further, as shown in  FIG.  2 B , the color wheel module  100   a  of this embodiment further includes a first glue layer  172 , a second glue layer  174 , and a third glue layer  176 . The first glue layer  172  is disposed between the fastening element  130  and the filters  150 , wherein the fastening element  130  is connected to the filters  150  through the first glue layer  172 . The second glue layer  174  is disposed between the driving assembly  110  and the filters  150 , wherein the driving assembly  110  is connected to the filters  150  through the second glue layer  174 . The third glue layer  176  is disposed between a top surface  121  of the substrate  120   a  and the filters  150 , wherein the filters  150  are connected to the top surface  121  of the substrate  120   a  through the third glue layer  176 . The top surface  121  of the substrate  120   a  is connected to the outer periphery  125 , for example, and the top surface  121  is parallel to the radial direction R. Moreover, balance material  180  may also be provided on the fastening element  130  to perform balance correction of the dynamic balance of the color wheel module  100   a.    
     Referring to  FIG.  2 C  and  FIG.  2 E  at the same time, in this embodiment, a lens optical axis (not shown) of the first light-collecting lens  15   b  of the light-guiding element  15  is parallel to the central axis C and is corresponding to the arrangement of the filters  150 . A lens optical axis (not shown) of the second light-collecting lens  15   c  of the light-guiding element  15  is provided perpendicular to the central axis C and is correspondingly adjacent to the outer periphery  125 . The excitation beam U provided by the light source device  13  may be, for example, a blue excitation beam. When the substrate  120   a  rotates around the rotating axis X as the central axis C, the light conversion region A 1  and the non-conversion region A 2  sequentially enter the transmission path of the excitation beam U. When the excitation beam U is incident on the light conversion region A 1  of the outer periphery  125  of the substrate  120   a,  the excitation beam U is converted into a conversion beam L″, and the conversion beam L″ is guided to penetrate corresponding filters  150  along a direction parallel to the central axis C. In one embodiment, a blue excitation beam L′ may also be directly guided to a subsequent light uniforming element without passing through the filters  150 . In another embodiment, the color wheel module  100   a  includes a transparent diffuser (not shown), and the diffuser and the filters  150  are disposed around the rotating axis X in a manner perpendicular to the rotating axis X of the driving assembly  110 . The blue excitation beam L′ may be guided to the diffuser, and penetrate the diffuser to the subsequent light uniforming element. Here, as shown in  FIG.  1   , the illumination beam L 1  of this embodiment includes at least one of the excitation beam L′ and the conversion beam L″. The illumination beam L 1  includes the excitation beam L′ or the conversion beam L″ at different time period. 
     More specifically, referring to  FIGS.  2 C and  2 E  at the same time, the blue excitation beam L′ from the light source device  13  may be incident obliquely on the light conversion region A 1  of the outer periphery  125  of the substrate  120   a  to be converted into the conversion beam L″. The excitation beam L′ may be, for example, incident obliquely on the yellow wavelength conversion layers  142  in the light conversion region A 1  and correspondingly converted into a diffused yellow conversion beam L″. The reflective layer  160   a  (refer to  FIG.  2 B ) located under the yellow wavelength conversion layers  142  reflects the conversion beam L″ such that the conversion beam L″ is sequentially guided by the second light-collecting lens  15   c,  the reflection mirrors  15   a,  and the first light-collecting lens  15   b  to penetrate the corresponding filters  150  (e.g. yellow filter or red filter) along a direction parallel to the central axis C. After that, the conversion beam L″ is filtered by the corresponding filter  150  to form a color light (for example, yellow light or red light). The color of the filtered conversion beam is different from the color of the excitation beam. Further, the excitation beam L′ may be incident obliquely in the green wavelength conversion layer  144  of the light conversion region A 1  at different timings and correspondingly converted into a diffused green conversion beam L″. The reflective layer  160   a  located under the green wavelength conversion layer  144  reflects the conversion beam L″ such that the conversion beam L″ is sequentially guided by the second light-collecting lens  15   c,  the reflection mirrors  15   a,  and the first light-collecting lens  15   b  to penetrate the corresponding filters  150  (e.g. green filter) along a direction parallel to the central axis C). After that, the conversion beam L″ is filtered by the filters  150  to form green light. Referring to  FIG.  2 D  and  FIG.  2 F , when the non-conversion region A 2  of the substrate  120   a  enters the transmission path of the blue excitation beam L′, the excitation beam L′ is incident obliquely on the non-conversion region A 2  of the substrate  120   a  and is reflected by the reflective layer  160   a.  The blue excitation beam L′ is guided by one or more reflection mirrors  15   a  to the first light-collecting lens  15   b.  Subsequently the first light-collecting lens  15   b  guides the excitation beam L′ to penetrate the corresponding filters  150  or a diffuser (not shown) without filtering function along a direction parallel to the central axis C, and forms blue light. 
     In short, in the color wheel module  100   a  of this embodiment, two yellow wavelength conversion layers  142  and one green wavelength conversion layer  144  are provided in the light conversion region A 1  of the outer periphery  125  of the substrate  120   a.  The non-conversion region A 2  disposes without wavelength conversion layers but disposes only the reflective layer  160   a,  and the filters  150  are provided in the radial direction R of the substrate  120   a.  The filters  150  are, for example, located between the outer periphery  125  of the substrate  120   a  and the rotating axis X of the driving assembly  110  in the radial direction R such that the color wheel module  100   a  function as both a phosphor wheel and a filter wheel. Furthermore, by configuring the light source device  13  to project the blue excitation beam L′ on the light conversion region A 1  provided on the outer periphery  125  to respectively generate green, yellow, and/or red light (the conversion beam), which are then guided to the corresponding filters  150  through the reflection mirrors  15   a,  the first light-collecting lens  15   b,  and the second light-collecting lens  15   c,  comprehensive application of the phosphor wheel and the filter wheel can be enabled and the benefit of reducing the size of the optical engine can be achieved. At the same time, the heat dissipation efficiency and wavelength conversion efficiency of the wavelength conversion layers can also be improved such that the color wheel module  100   a  of this embodiment has a better heat dissipation effect. Compared with the prior art in which the wavelength conversion layers are provided on the plane of a heat dissipation substrate in a radial direction, with the configuration of this embodiment, the heat dissipation efficiency of the color wheel module  100   a  can be increased from 100% to 300%, and the excitation efficiency can also be increased from 100% to 300%. Moreover, through the configuration, the flexibility in the space design of the optical engine and the flexibility in the design of the optical path of the optical engine can be increased, and the manufacturing cost of the projection device  10  can also be reduced. Further, the projection device  10  using the color wheel module  100   a  of this embodiment can have better projection quality and product competitiveness. 
     The following embodiments use the element numbers and part of the content of the foregoing embodiments, wherein the same reference numerals are used to represent the same or similar elements, and the description of the same technical content is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, and will not be repeated in the following embodiments. 
       FIG.  3 A  is a schematic top view of the relative position of a color wheel module and a light-guiding element according to an embodiment of the disclosure.  FIG.  3 B  is a three-dimensional exploded schematic view of the color wheel module of  FIG.  3 A .  FIG.  3 C  is a perspective schematic view of the relative position of the color wheel module and the light-guiding element of  FIG.  3 A .  FIG.  3 D  is a three-dimensional schematic view of the relative position of the color wheel module and the light-guiding element in  FIG.  3 C  from another viewing angle.  FIG.  3 E  is a schematic side view of the relative position of the color wheel module and the light-guiding element of  FIG.  3 A .  FIG.  3 F  is a three-dimensional schematic view of the relative position of the color wheel module and the light-guiding element of  FIG.  3 A  from another viewing angle.  FIG.  3 G  is a three-dimensional schematic view of the relative position of the color wheel module and the light-guiding element in  FIG.  3 F  from another viewing angle.  FIG.  3 H  is a schematic side view of the relative position of the color wheel module and the light-guiding element of  FIG.  3 A  from another viewing angle. 
     Referring to  FIG.  2 A ,  FIG.  2 B ,  FIG.  3 A ,  FIG.  3 B , and  FIG.  3 D  at the same time, a color wheel module  100   b  of this embodiment is similar to the color wheel module  100   a  of  FIG.  2 B . The difference between the two is that the outer periphery  125  of a substrate  120   b  has an opening  127  and the opening  127  corresponds to the non-conversion region A 2  of the substrate  120   b  in this embodiment. And the reflection mirror  15   a  disposed between the light source device  13  and the outer periphery  125  of the substrate  120   b  is a dichroic mirror which allows the blue excitation beam L′ passing therethrough and reflects the conversion beam L″. Furthermore, a reflective layer  160   b  is disposed in the light conversion region A 1  of the substrate  120   b,  wherein the reflective layer  160   b  is located between the wavelength conversion layers  142 ,  144  and the outer periphery  125 . In other words, the reflective layer  160   b  of this embodiment is not a complete ring structure, but an arc structure, exposing the opening  127  of the outer periphery  125 . 
     Referring to  FIGS.  3 C,  3 D, and  3 E  at the same time, the blue excitation beam L′ from the light source device  13  passes through dichroic mirror (the reflection mirror  15   a ) and is incident on the light conversion region A 1  of the outer periphery  125  of the substrate  120   b  along a direction perpendicular to the central axis C to be converted into a conversion beam L″ which has a different color from the excitation beam L′. The conversion beam L″ may be a green, yellow, and/or red light. The excitation beam L′ may be, for example, perpendicularly incident on the yellow wavelength conversion layers  142  in the light conversion region A 1  and correspondingly converted into a diffused yellow conversion beam L″. The reflective layer  160   b  (refer to  FIG.  3 B ) located under the yellow wavelength conversion layers  142  reflects the conversion beam L″ such that the conversion beam L″ is sequentially guided by the second light-collecting lens  15   c,  the reflection mirrors  15   a,  and the first light-collecting lens  15   b  to penetrate the corresponding filters  150  (e.g. yellow filter or red filter) along a direction parallel to the central axis C). After that, the conversion beam L″ is filtered by the filters  150  to form a color light (for example, yellow light or red light). The color of the filtered conversion beam is different from the color of the excitation beam. Moreover, the excitation beam L′ passes through dichroic mirror (the reflection mirror  15   a ) and is perpendicularly incident on the green wavelength conversion layer  144  in the light conversion region A 1  at different timings and correspondingly converted into a diffused green conversion beam L″. The reflective layer  160   b  located under the green wavelength conversion layer  144  reflects the conversion beam L″ such that the conversion beam L″ is sequentially guided by the second light-collecting lens  15   c,  the reflection mirrors  15   a,  and the first light-collecting lens  15   b  to penetrate the corresponding filters  150  (e.g. green filter) in a direction parallel to the central axis C. After that, the conversion beam L″ is filtered by the filters  150  to form green light. Referring to  FIGS.  3 F,  3 G and  3 H  at the same time, when the non-conversion region A 2  of the substrate  120   b  enters the transmission path of the blue excitation beam L′, the excitation beam L′ passes through dichroic mirror (the reflection mirror  15   a ) and is incident on the non-conversion region A 2  of the substrate  120   b  in a direction perpendicular to the central axis C. Then the excitation beam L′ penetrates the opening  127 . The blue excitation beam L′ is reflected by the reflection mirrors  15   a  provided between the opening  127  and the driving assembly  110  and penetrates the corresponding filters  150  or a diffuser (not shown) without filtering function along a direction parallel to the central axis C, and forms blue light. 
     In short, the color wheel module  100   b  of this embodiment includes two yellow wavelength conversion layers  142  and one green wavelength conversion layer  144  provided on the light conversion region A 1  of the outer periphery  125  of the substrate  120   b.  The non-conversion region A 2  does not dispose with wavelength conversion layers but is provided with the opening  127 , and the filters  150  are provided on the plane in the radial direction, such that the color wheel module  100   b  function as both a phosphor wheel and a filter wheel. Furthermore, by configuring the light source device  13  to project the blue excitation beam L′ on the light conversion region A 1  provided on the outer periphery  125  to respectively generate the conversion beam (green, yellow, and/or red lights), which are then guided to the corresponding filters  150  through the reflection mirrors  15   a,  the first light-collecting lens  15   b,  and the second light-collecting lens  15   c,  comprehensive application of the phosphor wheel and the filter wheel can be enabled and the benefit of reducing the size of the optical engine can be achieved. At the same time, the heat dissipation efficiency and wavelength conversion efficiency of the wavelength conversion layers can also be improved, such that the color wheel module  100   b  of this embodiment has a better heat dissipation effect. Moreover, the opening  127  on the outer periphery  125  of the substrate  120   b  allows the blue excitation beam L′ to penetrate, and, together with the reflection mirrors  15   a,  allows the blue excitation beam L′ to enter the filters  150  or the diffuser on the plane in the radial direction, such that the blue excitation beam L′ can generate green light, yellow light, red light, and blue light before passing through the filters  150 . 
     In summary, the embodiments of the disclosure have at least one of the following advantages or effects. In the design of the color wheel module of the disclosure, the light conversion region is located on the outer periphery of the substrate that is not parallel to the radial direction, the filters are configured around the rotating axis in a manner perpendicular to the rotating axis of the driving assembly, and the wavelength conversion layers are disposed on the light conversion region on the outer periphery. The excitation beam is incident perpendicularly or obliquely on the light conversion region of the outer periphery of the substrate and converted into a conversion beam, and the conversion beam is guided to penetrate the corresponding filters along a direction parallel to the central axis. Thereby, the heat dissipation efficiency and wavelength conversion efficiency of the wavelength conversion layers can be improved, such that the color wheel module of the disclosure has a better heat dissipation effect. Furthermore, through the configuration method, it is possible to increase the flexibility in the space design of the optical engine. In addition, the projection device using the color wheel module of the disclosure can have better projection quality and product competitiveness. 
     The foregoing description of the preferred of the disclosure has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure 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 disclosure and its best mode practical application, thereby to enable persons skilled in the art to understand the disclosure 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 disclosure 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 disclosure” or the like does not necessarily limit the claim scope to a specific embodiment, and the reference to particularly preferred exemplary embodiments of the disclosure does not imply a limitation on the disclosure, and no such limitation is to be inferred. The disclosure is limited only by the spirit and scope of the appended claims. Moreover, these claims may refer to use “first”, “second”, etc. following with noun or element. Such terms should be understood as a nomenclature and should not be construed as giving the limitation on the number of the elements modified by such nomenclature unless specific number has been given. 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 configured to interpret or limit the scope or meaning of the claims. Any advantages and benefits described may not apply to all embodiments of the disclosure. 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 disclosure 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.