Projection device

Abstract

The projection device comprises a light source module. The light source module comprises a light source, a light splitting element, a light filtering element and a wavelength conversion element. The light splitting element, the light filtering element and the wavelength conversion element are located on a transmission path of the excitation light beam. The light filtering element comprises a first light filtering area, a second light filtering area and a reflection area, and the light filtering element moves to enable the first light filtering area, the second light filtering area and the reflection area to enter a transmission path of the excitation light beam in sequence. The excitation light beam penetrates through the first light filtering area and the second light filtering area of the light filtering element and enters the wavelength conversion element, the wavelength conversion element generates a wavelength conversion light beam, and the wavelength conversion light beam enters the light filtering element. The wavelength conversion light beam enters the first light filtering area to generate first colored light and penetrates through the first light filtering area; the wavelength conversion light beam enters the second filtering area, generates second colored light and penetrates through the second filtering area. The excitation light beam is reflected by the reflection area to form a reflection light beam. The first colored light, the second colored light and the reflected light beam form an illumination light beam.

Description

Technical Field

[0001] The present invention relates to a projection device, and in particular to a projection device with a reduced light source module structure. Background Art

[0002] High-quality projected images have widespread application value in projection systems. Projection devices capable of providing high-quality projected images typically require their light source modules to provide high-quality, multi-color light. However, existing light source modules capable of providing high-quality, multi-color light often have complex and bulky internal structures, resulting in excessively large overall light source modules, and consequently, excessively large optical path systems for projection devices, leading to high manufacturing costs.

[0003] Therefore, efficiently generating high-quality multi-color light while simultaneously meeting the requirements of reducing system size and lowering costs has become an important issue in this technical field. Summary of the Invention

[0004] Therefore, an object of the present invention is to provide a projection device that can effectively reduce the structure of a light source module.

[0005] To achieve the above object, the present invention provides a projection device comprising: a light source module,

[0006] The light source module includes: a light source, a spectroscopic element, a filter element, and a wavelength conversion element;

[0007] The light source is used to emit an excitation light beam, and the spectrometer, the filter element, and the wavelength conversion element are sequentially located on a transmission path of the excitation light beam.

[0008] The filter element includes a first filter area, a second filter area, and a reflective area. The filter element moves so that the first filter area, the second filter area, and the reflective area sequentially enter the transmission path of the excitation light beam.

[0009] The excitation light beam passes through the first filter region and the second filter region of the filter element and enters the wavelength conversion element, causing the wavelength conversion element to generate a wavelength-converted light beam, which enters the filter element; the wavelength-converted light beam enters the first filter region of the filter element, generates a first color light, and passes through the first filter region; the wavelength-converted light beam enters the second filter region of the filter element, generates a second color light, and passes through the second filter region;

[0010] The excitation light beam is reflected by the reflection area of the filter element to form a reflected light beam;

[0011] The first color light, the second color light, and the reflected light beam form an illumination light beam.

[0012] Preferably, the beam splitter element is configured to reflect the excitation light beam having a first linear polarization direction and allow the illumination light beam having a second linear polarization direction to pass through.

[0013] Further preferably, the light source module further comprises: a quarter wave plate; the quarter wave plate is located between the light splitting element and the filter element;

[0014] The spectroscopic element reflects the excitation light beam, and after the excitation light beam passes through the quarter-wave plate, the polarization direction of the excitation light beam changes from the first linear polarization direction to circular polarization; after the illumination light beam passes through the quarter-wave plate from the filter element, the polarization direction of the illumination light beam changes from circular polarization to a second linear polarization direction; wherein, the second linear polarization direction is perpendicular to the first linear polarization direction.

[0015] Preferably, it also includes:

[0016] The homogenizing element is disposed on the transmission path of the excitation light beam and located between the beam splitter element and the filter element. The homogenizing element is used to homogenize the excitation light beam, the first color light, the second color light, and the reflected light beam incident on the homogenizing element.

[0017] Further preferably, the homogenizing element is a fly-eye lens.

[0018] Preferably, it also includes:

[0019] The homogenizing element is disposed on the transmission path of the excitation light beam and located between the filter element and the wavelength conversion element. The homogenizing element is used for homogenizing the excitation light beam and the wavelength conversion light beam incident on the homogenizing element.

[0020] Further preferably, the homogenizing element is a light guide column, wherein the light guide column is hollow or solid.

[0021] More preferably, the opening area of the light guide column on the filter element side is A1, and the opening area of the light guide column on the wavelength conversion element side is A2, and A1≥A2.

[0022] Preferably, the excitation light beam is blue light, and the first filter area allows the blue light beam and the red light beam to pass through, and the second filter area allows the blue light beam and the green light beam to pass through.

[0023] Preferably, the filter element rotates along a central axis so that the first filter area, the second filter area, and the reflective area sequentially enter the transmission path of the excitation light beam.

[0024] Preferably, the surface of the reflective region of the filter element has a diffusion layer to change the shape of the reflected light beam.

[0025] Preferably, the filter element further includes a fully transparent region, allowing the excitation light beam and the wavelength conversion light beam to pass through.

[0026] Preferably, the system further comprises: a light valve and a projection lens, wherein the illumination beam enters the light valve, the light valve converts the illumination beam into the image beam, and the projection lens is arranged on the optical path of the image beam.

[0027] More preferably, the device further comprises a refracting mirror, which is located on the optical path of the illumination light beam and between the beam splitting element and the light valve.

[0028] More preferably, a total internal reflection prism is further included, and the total internal reflection prism is located on the optical path of the illumination light beam, and the total internal reflection prism is located between the light source module and the light valve.

[0029] Compared to existing technologies, the projection device provided by the present invention utilizes a single-color light source and a single wavelength conversion element to generate a wavelength-converted light beam with two colors. By utilizing the two-color light-transmitting properties of the first and second filter zones of the filter element, the first and second colors are separated. This effectively reduces the size of the light source module, eliminating the need for multiple wavelength conversion elements while still producing multiple colors. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1A is a schematic diagram of a light source module according to an embodiment of the present invention.

[0031] Figure 1B is a schematic diagram of a light source module according to an embodiment of the present invention.

[0032] Figure 2 is a schematic diagram of a light source module according to an embodiment of the present invention.

[0033] Figure 3 is a schematic diagram of a light source module according to an embodiment of the present invention.

[0034] Figure 4A is a schematic diagram of a filter element according to an embodiment of the present invention.

[0035] Figure 4B is a schematic diagram of a filter element according to an embodiment of the present invention.

[0036] Figure 5 is a schematic diagram of a projection device according to an embodiment of the present invention.

[0037] Figure 6 is a schematic diagram of a projection device according to an embodiment of the present invention.

[0038] Figure 7is a schematic diagram of a projection device according to an embodiment of the present invention.

[0039] Figure 8 is a schematic diagram of a projection device according to an embodiment of the present invention.

[0040] Figure 9 is a schematic diagram of a projection device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the present invention is described in detail below with reference to the embodiments.

[0042] Certain terms are used throughout the specification and claims to refer to specific components. Those skilled in the art will understand that manufacturers may use different terms to refer to the same component. This specification and claims do not distinguish components by name, but rather by their functional differences. Throughout the specification and claims, the term "including" is open-ended and should be interpreted as meaning "including, but not limited to."

[0043] Figure 1A is a schematic diagram of a light source module according to an embodiment of the present invention. Figure 1A The present invention provides a projection device, comprising: a light source module 100A. Figure 1A As shown, the light source module 100A includes a light source 110 , a spectrometer 120 , a filter 140 , and a wavelength conversion element 150 .

[0044] The light source 110 is used to emit an excitation light beam LE. The spectrometer 120 , the filter element 140 , and the wavelength conversion element 150 are sequentially located on a transmission path of the excitation light beam LE.

[0045] In some embodiments, light source 110 is a laser light source, and the excitation light beam LE is blue light. For example, light source 110 may include a plurality of blue laser diodes arranged in an array. In some embodiments, light source 110 may emit a light beam with a specific polarization direction, such as an S-polarized light beam or a P-polarized light beam. In this embodiment, light source 110 may emit an S-polarized excitation light beam LE.

[0046] The excitation light beam LE emitted by the light source 110 is incident on the spectrometer 120. In this embodiment, the spectrometer 120 is configured to reflect incident light having a first linear polarization direction and transmit incident light having a second linear polarization direction. In this embodiment, the first linear polarization direction is S polarization, and the second linear polarization direction is P polarization. Therefore, in this embodiment, the spectrometer 120 is configured to reflect incident light having S polarization and transmit incident light having P polarization. In this embodiment, the incident light is the excitation light beam LE.

[0047] Therefore, in this embodiment, the excitation light beam LE with S polarization emitted by the light source 110 enters the spectrometer 120 and is reflected by the spectrometer 120. In another embodiment, if the excitation light beam LE emitted by the light source 110 has both S polarization and P polarization, the excitation light beam LE with P polarization will pass through the spectrometer 120 and leave the system.

[0048] In other embodiments, the first linear polarization direction may be P polarization, and the second linear polarization direction may be S polarization. That is, the beam splitter 120 is configured to reflect incident light with P polarization and transmit incident light with S polarization.

[0049] In some embodiments, the light source module 100A further includes a quarter-wave plate 130. The quarter-wave plate 130 is located between the beam splitter 120 and the filter 140. The excitation light beam LE reflected by the beam splitter 120 is incident on the quarter-wave plate 130 located on the optical path, causing the polarization direction of the excitation light beam LE to change from a first linear polarization direction to a circular polarization direction before entering the filter 140.

[0050] The structure of the filter element 140 can be found in Figure 4A . Figure 4A FIG is a schematic diagram of a filter element according to an embodiment of the present invention. Figure 4A As shown, the filter element 140A is an embodiment of the filter element 140 shown in FIG. 1 .

[0051] The filter element 140A includes a first filter region 142A, a second filter region 142B, and a reflective region 144. The filter element 140A moves so that the first filter region 142A, the second filter region 142B, and the reflective region 144 sequentially enter the transmission path of the excitation light beam LE. For example, the filter element 140A has a central axis A, and the filter element 140A rotates along the central axis A. The filter element 140A rotates along the central axis A so that the first filter region 142A, the second filter region 142B, and the reflective region 144 sequentially enter the transmission path of the excitation light beam LE, but the present disclosure is not limited to this. The excitation light beam LE passes through the first filter region 142A and the second filter region 142B, and is reflected by the reflective region 144 to form a reflected light beam L3.

[0052] In some embodiments, the first filter region 142A is a secondary color filter that allows two colors of light to pass through and blocks other colors of light. In this embodiment, the first filter region 142A is a magenta filter that allows a blue light beam and a red light beam to pass through.

[0053] In some embodiments, the second filter region 142B is a secondary color filter that allows two color lights to pass through and blocks other color lights. In this embodiment, the second filter region 142B is a cyan filter that allows a blue light beam and a green light beam to pass through.

[0054] In some embodiments, the reflective region 144 is configured to reflect the excitation light beam LE to form a reflected light beam L3. In some embodiments, the reflective region 144 is a mirror-reflective element, which may be blue light-reflecting glass. In other embodiments, the reflective region 144 may be made of a metal coating, such as silver, aluminum, or a dielectric coating, with a thickness less than 5 μm.

[0055] In some embodiments, the surface of the reflective region 144 of the filter element 140 has a diffusion layer to change the shape of the reflected light beam L3. In some embodiments, the diffusion layer includes microstructures such as diffusion particles having similar functions, but the present disclosure is not limited thereto.

[0056] Figure 4B FIG is a schematic diagram of a filter element according to an embodiment of the present invention. Figure 4B As shown, the filter element 140B is an embodiment of the filter element 140 shown in FIG. 1 . Figure 4B The filter element 140B is shown with Figure 4A The filter element 140A is similar to the one shown, so the similarities are not repeated here. Figure 4A Compared to the filter element 140A shown, Figure 4B The filter element 140B shown includes, in addition to the first filter region 142A, the second filter region 142B, and the reflective region 144, a fully transparent region 146 that allows all light beams passing through the fully transparent region 146 to pass through, that is, allows the excitation light beam LE and the wavelength converted light beam LC to pass through.

[0057] Therefore, when the excitation light beam LE enters the filter element 140, a portion of the excitation light beam LE passes through the filter element 140 and enters the wavelength conversion element 150, causing the wavelength conversion element 150 to generate a wavelength-converted light beam LC, which then enters the filter element 140. A portion of the excitation light beam LE is reflected by the filter element 140.

[0058] In this embodiment, the wavelength conversion element 150 is a material with wavelength conversion capabilities, such as phosphor or other substances with wavelength conversion capabilities, and is used to convert the excitation light beam LE into a wavelength-converted light beam LC having a different wavelength than the excitation light beam LE. In this embodiment, the wavelength conversion element 150 absorbs blue light and converts the blue light of the excitation light beam LE into yellow light of the wavelength-converted light beam LC. Since yellow light is a combination of green and red light, the wavelength-converted light beam LC is equivalent to a combination of green and red light. Furthermore, the polarization state of the wavelength-converted light beam LC is the same as that of the excitation light beam LE incident on the wavelength conversion element 150.

[0059] The wavelength converted light beam LC emitted by the wavelength conversion element 150 enters the filter element 140. Figure 4A and Figure 4B When the wavelength converted light beam LC enters the first filter region 142A of the filter element 140A or the filter element 140B, the first color light L1 is generated and passes through the first filter region 142A. When the wavelength converted light beam LC enters the second filter region 142B of the filter element 140, the second color light L2 is generated and passes through the second filter region 142B.

[0060] Specifically, because the first filter region 142A is a magenta filter that allows both blue and red light beams to pass through, when the wavelength-converted light beam LC enters the first filter region 142A of the filter element 140A or the filter element 140B, the wavelength-converted light beam LC is filtered by the first filter region 142A to generate the first color light L1. In this embodiment, the first color light L1 is the red portion of the wavelength-converted light beam LC. The green portion of the wavelength-converted light beam LC is blocked by the first filter region 142A.

[0061] On the other hand, because the second filter region 142B is a cyan filter that allows both blue and green light beams to pass through, when the wavelength-converted light beam LC enters the second filter region 142B of the filter element 140A or the filter element 140B, the wavelength-converted light beam LC is filtered by the second filter region 142B to generate the second color light L2. In this embodiment, the second color light L2 is the green portion of the wavelength-converted light beam LC. The red portion of the wavelength-converted light beam LC is blocked by the second filter region 142B.

[0062] When the wavelength-converted light beam LC enters the reflective region 144 , the wavelength-converted light beam LC does not penetrate the reflective region 144 .

[0063] Therefore, when the wavelength-converted light beam LC passes through the filter element 140, it generates a first color light L1 (i.e., red light) and a second color light L2 (i.e., green light). Furthermore, a reflected light beam L3 (i.e., blue light) is generated by reflection from the reflective region 144. Thus, the first color light L1, the second color light L2, and the reflected light beam L3 form the illumination light beam L.

[0064] In some other embodiments, when the wavelength converted light beam LC is incident on Figure 4B When the filter element 140B has the fully transparent region 146 shown, the wavelength-converted light beam LC passes through the fully transparent region 146. Since the wavelength-converted light beam LC is a combination of red and green light, equivalent to a combination of the first color light L1 (red light) and the second color light L2 (green light), the first color light L1 and the second color light L2 components in the illumination light beam L are increased. Furthermore, the fully transparent region 146 can increase the brightness and saturation of the illumination light beam.

[0065] In some embodiments, as Figure 4A The first filter region 142A, second filter region 142B, and reflective region 144 of the illustrated filter element 140A have equal areas. Therefore, when the filter element 140 sequentially rotates into the optical path of the excitation light beam LE, it can generate equal amounts of first color light L1, second color light L2, and reflected light beam L3. However, in other embodiments, the areas of the first filter region 142A, second filter region 142B, and reflective region 144 may be unequal, depending on the desired color ratio combination, and the present disclosure is not limited thereto.

[0066] In some embodiments, as Figure 4B The areas of the first filter region 142A, the second filter region 142B, the reflective region 144 and the fully transparent region 146 of the filter element 140B can be equal or unequal according to the required color ratio, but the present disclosure is not limited thereto.

[0067] The illumination light beam L emitted by the filter element 140 is incident on the quarter-wave plate 130 along the optical path. At this time, the polarization directions of the first color light L1, the second color light L2, and the reflected light beam L3 in the illumination light beam L change from circular polarization to linear polarization again. However, the linear polarization direction now changes from the S polarization of the excitation light beam LE emitted by the light source 110 to P polarization, i.e., the second linear polarization direction.

[0068] The illumination beam L passing through the quarter-wave plate 130 enters the spectrometer 120 along the optical path. Since the illumination beam L is P-polarized and the spectrometer 120 can transmit the incident beam with P polarization, the illumination beam L passes through the spectrometer 120 and proceeds along the optical path.

[0069] In some embodiments, the light source module 100A further includes a lens 170 located between the quarter-wave plate 130 and the filter element 140. The lens 170 generally refers to a lens with a light-converging function, and is used to change the characteristics of the excitation light beam LE and the illumination light beam L.

[0070] Therefore, the light source module 100A shown in FIG1 utilizes a single-color light source 110 and a wavelength conversion element 150 to generate a wavelength-converted light beam LC having two colors. The first filter region 142A and the second filter region 142B of the filter element 140, which allow both colors of light to pass through, are then separated into the first color light L1 and the second color light L2. Therefore, the light source module 100A can effectively reduce the size of the light source module and generate multiple colors without requiring multiple wavelength conversion elements.

[0071] Figure 1B is a schematic diagram of a light source module according to an embodiment of the present invention. Figure 1B The light source module 100B shown is Figure 1A The light source module 100A shown is similar, so the similarities are not repeated here. Figure 1B The light source module 100B shown is Figure 1A The difference in the illustrated light source module 100A is that the excitation light beam LE emitted by the light source 110 is polarized P. Therefore, when incident on the spectrometer 120, the excitation light beam LE passes through the spectrometer 120, sequentially passing through the quarter-wave plate 130, the filter element 140, and the wavelength conversion element 150, before returning to the spectrometer 120 along its original optical path. When the illumination light beam L passes through the spectrometer 120, the P-polarized excitation light beam LE becomes S-polarized after passing through the quarter-wave plate 130 twice. Therefore, it is reflected by the spectrometer 120 and continues along its original optical path.

[0072] In this embodiment, the light source 110 is located on one side of the beam splitter 120 , while the quarter-wave plate 130 , the filter element 140 , and the wavelength conversion element 150 are all located on the other opposite side of the beam splitter 120 .

[0073] Therefore, according to the linear polarization direction of the light required by the system, whether it is S polarization or P polarization, an appropriate light source system can be selected, such as Figure 1A Light source system 100A or Figure 1B As shown in the light source system 100B.

[0074] Figure 2 is a schematic diagram of a light source module according to an embodiment of the present invention. Figure 2 The light source module 100C shown is Figure 1A The light source module 100A shown is similar, so the similarities are not repeated here. Figure 2The light source module 100C shown is Figure 1A The light source module 100A shown differs in that the light source module 100C further includes a homogenizing element 160A, which is disposed in the transmission path of the excitation light beam LE and located between the beam splitter 120 and the filter 140. In some embodiments, the homogenizing element 160A is located between the beam splitter 120 and the quarter-wave plate 130. The homogenizing element 160A is used to homogenize the excitation light beam LE, the first color light L1, the second color light L2, and the reflected light beam L3 incident on the homogenizing element 160A.

[0075] Specifically, when the excitation light beam LE enters the homogenizer 160A, the homogenizer 160A can shape the excitation light beam LE, for example, converting a circular spot of the excitation light beam LE into a rectangular spot. The shaped excitation light beam LE then passes through the filter 140 and enters the wavelength conversion element 150. On the other hand, when the illumination light beam L comprising the first color light L1, the second color light L2, and the reflected light beam L3 passes through the homogenizer 160A, the homogenizer 160A can shape the illumination light beam L comprising the first color light L1, the second color light L2, and the reflected light beam L3 so that the illumination light beam L has a desired shape.

[0076] Therefore, in this embodiment, the reflected light beam L3 of the illumination light beam L, i.e., the blue light, passes through the homogenizer 160A twice, i.e., is shaped twice, while the first color light L1 and the second color light L2 of the illumination light beam pass through the homogenizer 160A once, i.e., are shaped once.

[0077] In some embodiments, the homogenizing element 160A is a fly eye lens, or has other similar functions, but the present disclosure is not limited thereto.

[0078] In some embodiments, the homogenizing element 160A may also be similar to Figure 2 Configuration method, configured in Figure 1B The homogenizing element 160A is located between the beam splitter 120 and the filter element 140 on the transmission path of the excitation light beam LE of the light source module 100B. In some embodiments, the homogenizing element 160A is located between the beam splitter 120 and the quarter-wave plate 130.

[0079] Figure 3 is a schematic diagram of a light source module according to an embodiment of the present invention. Figure 3 The light source module 100D shown is Figure 1A The light source module 100A shown is similar, so the similarities are not repeated here. Figure 3 The light source module 100D shown is Figure 1AThe difference between the light source module 100A shown is that the light source module 100D further includes a homogenizing element 160B, which is disposed in the transmission path of the excitation light beam LE and located between the filter element 140 and the wavelength conversion element 150. The homogenizing element 160B is used to homogenize the excitation light beam LE and the wavelength conversion light beam LC incident on the homogenizing element 160B.

[0080] Specifically, when the excitation beam LE enters the homogenizer 160B, the homogenizer 160B can shape the excitation beam LE, for example, converting a circular spot of the excitation beam LE into a rectangular spot. The shaped excitation beam LE then enters the wavelength conversion element 150. On the other hand, when the wavelength-converted beam LC emitted by the wavelength conversion element 150 passes through the homogenizer 160B, the homogenizer 160B can shape the wavelength-converted beam LC to have a desired shape, allowing the filter element 140 to filter the shaped wavelength-converted beam LC.

[0081] Therefore, in this embodiment, the reflected light beam L3 of the illumination light beam L does not pass through the homogenizer 160B, that is, it does not undergo shaping. However, the first color light L1 and the second color light L2 of the illumination light beam both pass through the homogenizer 160B once, that is, they are shaped once.

[0082] In some embodiments, the homogenizing element 160B is a light guide rod, or has other similar functions, but the present disclosure is not limited thereto. In some embodiments, the homogenizing element 160B, ie, the light guide rod, is hollow or solid.

[0083] In some embodiments, the area of the opening 160B1 of the light guide on the filter element 140 side is A1, and the area of the opening 160B2 on the wavelength conversion element 150 side is A2, where A1 ≥ A2. Therefore, when the excitation light beam LE enters the homogenizing element 160B, it not only shapes the light but also has a converging effect.

[0084] In some embodiments, the homogenizing element 160B may also be similar to Figure 3 Configuration method, configured in Figure 1B The light source module 100B is located on the transmission path of the excitation light beam LE, and is located between the filter element 140 and the wavelength conversion element 150 .

[0085] Figure 5 is a schematic diagram of a projection device according to an embodiment of the present invention. Figure 5 . Figure 5 The projection device 10A includes a light source module 100D for generating an illumination beam L. The light source module 100D may also be Figure 1A The light source module 100A shown, Figure 1B The light source module 100B shown, Figure 2 The light source module 100C shown in the figure is any one of the above, and the present disclosure is not limited thereto. The filter element 140 in the light source module 100D can be Figure 4A The filter element 140A shown or Figure 4B The present disclosure is not limited to any one of the filter elements 140B shown.

[0086] like Figure 5 As shown, the projection device 10A further includes a light valve 220 and a projection lens 230. The illumination beam L emitted by the light source module 100D enters the light valve 220. The light valve 220 converts the illumination beam L into an image beam LI. The projection lens 230 is disposed on the optical path of the image beam LI.

[0087] In some embodiments, the projection device 10A further includes a diopter 210. After passing through the diopter 210, the illumination light beam L enters the light valve 220. Specifically, the diopter 210 generally refers to a lens having a light-converging function, which is used to project the illumination light beam L onto the light valve 220. Specifically, in some embodiments, the diopter 210 is a lens having positive refractive power.

[0088] The projection device 10A further includes a diopter 240 located in the optical path of the illumination beam L. The diopter 240 is located between the beam splitter 120 and the light valve 220 to change the optical path of the illumination beam L. In the projection device 10A including the diopter 210, the diopter 240 is further located between the beam splitter 120 and the diopter 210. In some embodiments, the diopter 240 may be a flat mirror, a curved mirror, or other mirrors having similar functions, but the present disclosure is not limited thereto.

[0089] The illumination beam L is reflected by the diopter 240, passes through the optical actuator 212, and then enters the light valve 220. The light valve 220 is adapted to convert the illumination beam L into an image beam LI. In this embodiment, the light valve 220 is, for example, a digital micro-mirror device (DMD) or a liquid-crystal-on-silicon (LCOS) panel. However, in other embodiments, the light valve 220 may be a transmissive liquid crystal panel or other beam modulator. The image beam LI passes through the reciprocating mirror of the optical actuator 212, thereby increasing image resolution.

[0090] Projection lens 230 is located in the transmission path of image beam LI and is suitable for projecting image beam LI onto a screen (not shown) to form an image. In this embodiment, projection lens 230 includes a combination of one or more optical lenses with refractive power. The optical lenses include, 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. The present invention does not limit the type and form of projection lens 230.

[0091] After the illumination beam L converges on the light valve 220 , the light valve 220 sequentially converts the illumination beam L into image beams LI of different colors and transmits them to the projection lens 230 . Therefore, the image screen projected by the image beams LI converted by the light valve 220 can be a color screen.

[0092] Figure 6 is a schematic diagram of a projection device according to an embodiment of the present invention. Figure 6 The projection device 10B shown is Figure 5 The projection device 10A shown is similar, so the similarities are not repeated here. Figure 6 The projection device 10B shown is Figure 5 The difference of the projection device 10A shown is that Figure 6 In the projection device 10B, the total internal reflection prism 222 is further included. The total internal reflection prism 222 is located in the optical path of the illumination light beam L, between the light source module 100D and the light valve 220. In the projection device 10A including the diopter 210, the total internal reflection prism 222 is further located between the diopter 210 and the light valve 220. After the illumination light beam L passes through the diopter 210, it is incident on the total internal reflection prism 222.

[0093] The total internal reflection prism 222 is a right triangle. The illumination beam L enters the total internal reflection prism 222 and is totally reflected by the long side of the total internal reflection prism 222 before entering the actuator 212 and the light valve 220. The light valve 220 converts the illumination beam L into an image beam LI. The image beam LI then passes through the total internal reflection prism 222 and the lens 224 before entering the projection lens 230.

[0094] Therefore, the combination of the total internal reflection prism 222 and the lens 224 can achieve the effect of changing the optical paths of the illumination light beam L and the image light beam LI.

[0095] Figure 7 is a schematic diagram of a projection device according to an embodiment of the present invention. Figure 7 The projection device 10C shown is Figure 5 The projection device 10A shown is similar, so the similarities are not repeated here. Figure 7 The projection device 10C shown is Figure 5The difference of the projection device 10A shown is that Figure 7 In FIG, after the illumination light beam L passes through the refractive element 210 , it enters the total internal reflection prism 260 .

[0096] Total internal reflection prism 260 is a right triangle. After the illumination beam L enters total internal reflection prism 260, it passes through the long side of total internal reflection prism 222 and enters light valve 220. Light valve 220 converts the illumination beam L into an image beam LI, which then enters projection lens 230 after undergoing total reflection from the long side of total internal reflection prism 222.

[0097] Therefore, the total internal reflection prism 260 can achieve the effect of changing the optical paths of the illumination light beam L and the image light beam LI.

[0098] Figure 8 is a schematic diagram of a projection device according to an embodiment of the present invention. Figure 8 The projection device 10D shown is Figure 5 The projection device 10A shown is similar, so the similarities are not repeated here. Figure 8 The projection device 10F shown is Figure 5 The difference of the projection device 10A shown is that Figure 8 In FIG. 2 , after the illumination light beam L passes through the refractive element 210 , it passes through the lens 270 and the total internal reflection prism 272 and then enters the light valve 220 .

[0099] After the light valve 220 converts the illumination beam L into an image beam LI, the image beam LI enters the total internal reflection prism 272 , is totally reflected by the long side of the total internal reflection prism 272 , and then enters the projection lens 230 .

[0100] Therefore, the combination of the lens 270 and the total internal reflection prism 272 can achieve the effect of changing the optical paths of the illumination light beam L and the image light beam LI.

[0101] Figure 9 is a schematic diagram of a projection device according to an embodiment of the present invention. Figure 9 The projection device 10E shown is Figure 5 The projection device 10A shown is similar, so the similarities are not repeated here. Figure 9 The projection device 10F shown is Figure 5 The difference of the projection device 10A shown is that Figure 9 In the embodiment, the refractive element 210 is a curved mirror with positive refractive power. After the illumination beam L is reflected by the refractive element 210, it enters the light valve 220 through the actuator 212. The light valve 220 converts the illumination beam L into an image beam LI, which then enters the projection lens 230.

[0102] Therefore, the optical path of the illumination light beam L can be changed by using the diopter element 210 .

[0103] In summary, the projection device provided by the present invention utilizes a single-color light source and a wavelength conversion element to generate a wavelength-converted light beam with two colors. By utilizing the properties of the first and second filter regions of the filter element, which allow both colors of light to pass through, the first and second colors of light are separated. This effectively reduces the size of the light source module, eliminating the need for multiple wavelength conversion elements while still producing multiple colors of light.

[0104] The present invention has been described with reference to the above embodiments. However, the above embodiments are merely exemplary embodiments of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and improvements that do not depart from the spirit and scope of the present invention are intended to be protected by the present invention.

Claims

1. A projection device, comprising: The light source module is characterized in that: The light source module includes: a light source, a spectroscopic element, a filter element, and a wavelength conversion element; The light source is used to emit an excitation light beam, and the spectrometer, the filter element, and the wavelength conversion element are sequentially located on a transmission path of the excitation light beam. The filter element includes a first filter area, a second filter area, and a reflective area. The filter element moves so that the first filter area, the second filter area, and the reflective area sequentially enter the transmission path of the excitation light beam. The excitation light beam passes through the first filter region and the second filter region of the filter element and enters the wavelength conversion element, causing the wavelength conversion element to generate a wavelength-converted light beam, which enters the filter element; the wavelength-converted light beam enters the first filter region of the filter element, generates a first color light, and passes through the first filter region; the wavelength-converted light beam enters the second filter region of the filter element, generates a second color light, and passes through the second filter region; The excitation light beam is reflected by the reflection area of the filter element to form a reflected light beam; The first color light, the second color light, and the reflected light beam form an illumination light beam.

2. The projection device according to claim 1, wherein The beam splitter is used for reflecting the excitation light beam with a first linear polarization direction and allowing the illumination light beam with a second linear polarization direction to pass through.

3. The projection device according to claim 2, wherein: The light source module further includes: a quarter wave plate; the quarter wave plate is located between the light splitting element and the filter element; The spectroscopic element reflects the excitation light beam, and after the excitation light beam passes through the quarter-wave plate, the polarization direction of the excitation light beam changes from the first linear polarization direction to circular polarization; after the illumination light beam passes through the quarter-wave plate from the filter element, the polarization direction of the illumination light beam changes from circular polarization to a second linear polarization direction; wherein, the second linear polarization direction is perpendicular to the first linear polarization direction.

4. The projection device according to claim 1, wherein: Also includes: The homogenizing element is disposed on the transmission path of the excitation light beam and located between the beam splitter element and the filter element. The homogenizing element is used to homogenize the excitation light beam, the first color light, the second color light, and the reflected light beam incident on the homogenizing element.

5. The projection device according to claim 4, wherein: The homogenizing element is a fly-eye lens.

6. The projection device according to claim 1, wherein: Also includes: The homogenizing element is disposed on the transmission path of the excitation light beam and located between the filter element and the wavelength conversion element. The homogenizing element is used for homogenizing the excitation light beam and the wavelength conversion light beam incident on the homogenizing element.

7. The projection device according to claim 6, wherein: The homogenizing element is a light guide rod, wherein the light guide rod is hollow or solid.

8. The projection device according to claim 6, wherein: The opening area of the light guide column on the filter element side is A1, and the opening area on the wavelength conversion element side is A2, and then A1≥A2.

9. The projection device according to claim 1, wherein: The excitation light beam is blue light, and the first filter area allows the blue light beam and the red light beam to pass through, and the second filter area allows the blue light beam and the green light beam to pass through.

10. The projection device according to claim 1, wherein: The filter element rotates along a central axis so that the first filter area, the second filter area and the reflection area enter the transmission path of the exciting light beam in sequence.

11. The projection device according to claim 1, wherein: The surface of the reflection area of the filter element is provided with a diffusion layer to change the shape of the reflected light beam.

12. The projection device according to claim 1, wherein: The filter element further includes a full-transmission area for allowing the excitation light beam and the wavelength-converted light beam to pass through.

13. The projection device according to claim 1, wherein: Also includes: A light valve and a projection lens, wherein the illumination beam enters the light valve, the light valve converts the illumination beam into the image beam, and the projection lens is arranged on the optical path of the image beam.

14. The projection device according to claim 13, wherein: The device further comprises a refracting mirror, which is located on the optical path of the illumination light beam and between the light splitting element and the light valve.

15. The projection device according to claim 13, wherein: It also includes a total internal reflection prism, which is located on the light path of the illumination light beam and between the light source module and the light valve.

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