Light source module

Abstract

The present invention provides a light source module, which includes a light source, a bidirectional beam splitter unit, a color wheel and a wavelength conversion unit. The light source is used to emit a light. The bidirectional beam splitter unit is opposite to the light source and is used to reflect part of the light along a first direction as a first illumination light and reflect part of the light along a second direction as a second illumination light, and the first direction is opposite to the second direction. The color wheel is opposite to the bidirectional beam splitter unit and receives at least the first illumination light, and the color wheel has a blue filter area, a green filter area and a red filter area. The wavelength conversion unit is opposite to the color wheel and the bidirectional beam splitter unit, and is used to receive at least the second illumination light and provide a converted light to the color wheel.

Description

Technical Field

[0001] The invention relates to a light source module, and in particular to a light source module with a wavelength conversion unit. Background Art

[0002] In the prior art, the light source module of the projector can provide an illumination light to the illumination module, wherein the illumination module converts the illumination light into image light and projects it. Generally speaking, in order to conform to the color change of the image light, the light source module usually converts blue light into other color lights. However, in the optical path of blue light transmission and / or conversion, part of the blue light will inevitably be wasted. Therefore, how to recycle this blue light to increase the light utilization rate is an important issue for the industry in this technical field. In addition, the existing light source module has many optical components, large size, and heavy weight, which is not conducive to lightweight projection applications. Summary of the invention

[0003] Therefore, the present invention provides a light source module to improve the conventional problems.

[0004] The present invention provides a light source module, comprising:

[0005] A first light source is used to emit a first light; a dichroic beam splitter unit is opposite to the first light source and is used to reflect part of the first light along a first direction as a first illumination light and reflect part of the first light along a second direction as a second illumination light, wherein the first direction is opposite to the second direction; a color wheel is opposite to the dichroic beam splitter unit and receives at least the first illumination light, wherein the color wheel has a blue filter area, a green filter area and a red filter area; and a wavelength conversion unit is opposite to the color wheel and the dichroic beam splitter unit and is used to receive at least the second illumination light and provide converted light to the color wheel.

[0006] Preferably, it also includes: a focusing lens located between the bidirectional splitting unit and the color wheel, the focusing lens includes a first part and a second part, the first illumination light is projected to the color wheel through the first part; wherein the first illumination light becomes reflected light after being reflected from the color wheel, and the reflected light is projected to the wavelength conversion unit through the second part.

[0007] Preferably, the optical axis of the condenser lens is located between the first portion and the second portion, and the bidirectional light splitting unit corresponds to the first portion along the extension direction of the optical axis.

[0008] Preferably, the bidirectional light splitting unit has a turning point, and the turning point is located on an extension line of the optical axis of the focusing lens.

[0009] Preferably, the bidirectional light splitting unit has a first reflection surface, and the angle between the first reflection surface and the optical axis of the focusing lens is 45 degrees.

[0010] Preferably, the device further comprises: a first collimating lens located between the bidirectional light splitting unit and the first light source.

[0011] Preferably, the bidirectional light splitting unit has a turning point, and the turning point is located on an extension line of the optical axis of the first collimating lens.

[0012] Preferably, the bidirectional light splitting unit has a first reflecting surface, and an angle between the first reflecting surface and the optical axis of the first collimating lens is 135 degrees.

[0013] Preferably, it also includes: a second collimating lens, located between the bidirectional beam splitting unit and the wavelength conversion unit, the second collimating lens includes a third part and a fourth part, and the second illumination light is projected to the wavelength conversion unit through the third part; wherein the wavelength conversion unit converts the second illumination light into converted light, and the converted light is projected to the color wheel through the second collimating lens.

[0014] Preferably, the bidirectional light splitting unit has a turning point, and the turning point is located on an extension line of the optical axis of the second collimating lens.

[0015] Preferably, the bidirectional light splitting unit has a second reflecting surface, and the angle between the second reflecting surface and the optical axis of the second collimating lens is 45 degrees.

[0016] Preferably, the optical axis of the second collimating lens is located between the third portion and the fourth portion, and the bidirectional beam splitting unit corresponds to the third portion along the extending direction of the optical axis of the second collimating lens.

[0017] Preferably, it also includes: a focusing lens located between the bidirectional beam splitting unit and the color wheel; and a second collimating lens located between the bidirectional beam splitting unit and the wavelength conversion unit; wherein the extension line of the optical axis of the focusing lens coincides with the extension line of the optical axis of the second collimating lens.

[0018] Preferably, the bidirectional light splitting unit is V-shaped.

[0019] Preferably, the bidirectional light splitting unit includes: a first reflecting portion, used to reflect part of the first light into the first illumination light; and a second reflecting portion, connected to the first reflecting portion and used to reflect part of the first light into the second illumination light; wherein the angle between the first reflecting portion and the second reflecting portion is less than 180 degrees.

[0020] Preferably, the bidirectional beam splitting unit reflects light with the first wavelength and allows light with the second wavelength to pass through, the first wavelength is different from the second wavelength; wherein the first light includes light with the first wavelength, and the converted light includes light with the second wavelength.

[0021] Preferably, the device further comprises: a second light source for emitting a second light, wherein the second light is projected onto the color wheel via the wavelength conversion unit.

[0022] Preferably, the first light includes light of a first wavelength, the converted light includes light of a second wavelength, the first wavelength being different from the second wavelength; the second light includes light of the first wavelength, or the second light includes light of the second wavelength.

[0023] Preferably, the first wavelength is less than or equal to 460 nanometers, and the second wavelength is greater than or equal to 460 nanometers and less than or equal to 680 nanometers.

[0024] Preferably, at least one of the green filter area and the red filter area is further used to reflect the first illumination light.

[0025] Compared with the prior art, the light source module proposed in the present invention uses a bidirectional beam splitting unit to split the first light into a first illumination light and a second illumination light projected in different directions, and respectively provides the first illumination light to the color wheel and the wavelength conversion unit. The second illumination light is converted into conversion light by the wavelength conversion unit and provided to the color wheel. The bidirectional beam splitting unit can greatly simplify the system components and reduce the size of the light source. In addition, the color wheel can be used to recover the reflected light reflected by the color wheel to the wavelength conversion unit for reuse, so as to improve the efficiency of light use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 FIG. 4 is a functional block diagram of a projection device according to an embodiment of the present invention.

[0027] Figure 2-Figure 3 Draw Figure 1 Schematic diagram of the light path of the light source module of the projection device.

[0028] Figure 4 Draw Figure 2 Schematic diagram of a color wheel of a projection device.

[0029] Figure 5 Draw Figure 2 Schematic diagram of a wavelength conversion unit of a projection device.

[0030] Figure 6 A schematic diagram of a light source module according to another embodiment of the present invention is shown. DETAILED DESCRIPTION

[0031] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0032] Please refer to Figure 1 to Figure 5 , Figure 1 FIG. 1 is a functional block diagram of a projection device 10 according to an embodiment of the present invention. Figures 2-3Draw Figure 1 A schematic diagram of the optical path of the light source module 100 of the projection device 10, Figure 4 Draw Figure 2 Schematic diagram of the color wheel 130 of the projection device 10, and Figure 5 Draw Figure 2 Schematic diagram of the wavelength conversion unit 140 of the projection device 10.

[0033] The projection device 10 includes a light source module 100, an illumination module 10A, and an imaging module 10B. The light source module 100 can provide a light beam that is sequentially projected onto a screen (not shown) via the illumination module 10A and the imaging module 10B. The illumination module 10A includes at least one light valve, such as a digital micromirror device (DMD), which can convert the illumination light into an image light (or "pattern light"). The imaging module 10B includes at least one lens, which can project the image light onto the screen.

[0034] like Figure 2 As shown, the light source module 100 includes a first light source 110, a dichroic mirror unit 120, a color wheel 130, a wavelength conversion unit 140, a focusing lens 150, a first collimating lens 160, a second collimating lens 170 and a light guide column 180. In another embodiment, the light guide column 180 may also belong to the lighting module 10A. In other embodiments, the light guide column 180 may also be replaced by other optical elements that play a role in uniform light, and the position is not limited to the light outlet of the color wheel 130 in the embodiment, and the embodiment of the present invention is not limited thereto.

[0035] like Figure 2 As shown, the first light source 110 is used to emit a first light L1. The bidirectional beam splitter unit 120 is disposed relative to the first light source 110 and is used to reflect a first portion L11 of the first light L1 along a first direction D1 as a first illumination light L21 and to reflect a second portion L12 of the first light L1 along a second direction D2 as a second illumination light L22, wherein the first direction D1 is opposite to the second direction D2. The color wheel 130 is disposed relative to the bidirectional beam splitter unit 120 and is used to at least receive the first illumination light L21. The color wheel 130 has a blue filter region 130B, a green filter region 130G, and a red filter region 130R (as shown in FIG. 1 ). Figure 4). The wavelength conversion unit 140 is disposed relative to the color wheel 130 and the bidirectional beam splitting unit 120 and is used to at least receive the second illumination light L22 and provide a converted light L3 to the color wheel 130. In this way, only the same bidirectional beam splitting unit 120 is needed to split the first light L1 into two parts (e.g., the first part L11 and the second part L12) and reflect them to the color wheel 130 and the wavelength conversion unit 140 respectively. In an embodiment, the first illumination light L21 and the second illumination light L22 reflected from the bidirectional beam splitting unit 120 are approximately 180 degrees apart.

[0036] In the present embodiment, the first light source 110 is, for example, a light emitting diode or a laser light source, but the present invention is not limited thereto. The first light L1 has a first wavelength, and the converted light L3 has a second wavelength, and the first wavelength is different from the second wavelength. In one embodiment, the first wavelength may be less than or equal to 460 nanometers, and the second wavelength may be in the range of 460 nanometers to 680 nanometers (including the endpoint values). In terms of light color, the first light L1 is, for example, blue light, and the converted light L3 is, for example, yellow light.

[0037] like Figure 2 As shown, the bidirectional beam splitting unit 120 is, for example, a bidirectional beam splitting lens, which can reflect light with a first wavelength and allow light with a second wavelength to pass through, wherein the first wavelength is different from the second wavelength. The bidirectional beam splitting unit 120 includes a first reflecting portion 121 and a second reflecting portion 122, wherein the second reflecting portion 122 is connected to the first reflecting portion 121. The first reflecting portion 121 is used to reflect the first portion L11 of the first light L1 into the first illumination light L21, and the second reflecting portion 122 is used to reflect the second portion L12 of the first light L1 into the second illumination light L22. The first reflecting portion 121 of the bidirectional beam splitting unit 120 has a first reflecting surface 120s1 to reflect the first illumination light L21, and the second reflecting portion 122 has a second reflecting surface 120s2 to reflect the second illumination light L22. In addition, the angle A1 between the first reflective portion 121 and the second reflective portion 122 is less than 180 degrees, for example, 45 degrees, 90 degrees, 135 degrees or other integer values ​​not equal to 0 degrees or 180 degrees, that is, the first reflective portion 121 and the second reflective portion 122 do not overlap. In terms of appearance, the bidirectional light splitting unit 120 is V-shaped. In addition, the first reflective portion 121 and the second reflective portion 122 are, for example, an integrally formed structure.

[0038] The green filter region 130G and / or the red filter region 130R of the color wheel 130 can reflect the first light L1 (or the first illumination light L12). In addition, the green filter region 130G can filter out the green light of the converted light L3, and the green light can pass through the green filter region 130G. Similarly, the red filter region 130R can filter out the red light of the converted light L3, and the red light can pass through the red filter region 130R. In this embodiment, a dichroic mirror layer can be provided on the light exiting surfaces of the green filter region 130G and the red filter region 130R in the color wheel 130, so as to reflect the blue light and pass through the green light or the red light.

[0039] The color wheel 130 can rotate so that the blue filter area 130B, the green filter area 130G and the red filter area 130R rotate to align with the condenser lens 150 at different time points. When the blue filter area 130B is aligned with the condenser lens 150, blue light can pass through the blue filter area 130B, but yellow light is reflected from the blue filter area 130B. When the green filter area 130G is aligned with the condenser lens 150, green light in the yellow light can pass through the green filter area 130G. When the red filter area 130R is aligned with the condenser lens 150, red light in the yellow light can pass through the red filter area 130R.

[0040] The wavelength conversion unit 140, for example, includes a plurality of fluorescent particles (not shown), which can convert the wavelength of light, for example, convert the first wavelength of light into a second wavelength. Figure 5 As shown, the wavelength conversion unit 140 includes a carrier 141 and a wavelength conversion layer 142, wherein the wavelength conversion layer 142 includes a plurality of fluorescent particles and is disposed on the carrier 141. The wavelength conversion layer 142 can convert the wavelength of light. The carrier 141 can have a carrying surface 141s, and the wavelength conversion layer 142 is disposed on the carrying surface 141s. In this embodiment, the wavelength conversion unit 140 can be a rotating type or a fixed type. The rotating wavelength conversion unit 140 can prevent the light from being incident on the same point of the wavelength conversion unit 140 and can help dissipate heat by rotating, thereby improving the problems caused by heat accumulation (such as reduced conversion efficiency, thermal attenuation, etc.). In addition, in this embodiment, the wavelength conversion layer 142 is, for example, in the form of a ring, such as a closed ring. In this way, when the wavelength conversion unit 140 rotates, it can ensure that the light continues to be incident on the wavelength conversion layer 142 for wavelength conversion.

[0041] The focusing lens 150 is, for example, a shrinking lens, which can reduce the diameter of the light passing through. The first collimating lens 160 and the second collimating lens 170 can convert the light passing through into collimated light. The focusing lens 150, the first collimating lens 160 and / or the second collimating lens 170 can include at least one optical lens. The embodiment of the present invention does not limit the number of optical lenses of the focusing lens 150, the first collimating lens 160 and / or the second collimating lens 170, as long as the optical effects of shrinking and collimating can be achieved.

[0042] like Figure 3 As shown, when the red filter area 130R or the green filter area 130G of the color wheel 130 is aligned with the condenser lens 150, the first illumination light L21 (e.g., blue light) passing through the condenser lens 150 is reflected from the red filter area 130R or the green filter area 130G to become a reflected light L21'. The reflected light L21' (e.g., blue light) passes through the condenser lens 150 and the second collimating lens 170 in sequence to the wavelength conversion unit 140. The wavelength conversion unit 140 converts the reflected light L21' into a converted light L3, and the converted light L3 passes through the second collimating lens 170, the dichroic beam splitting unit 120 and the condenser lens 150 in sequence to the color wheel 130. Since the dichroic beam splitting unit 120 allows the light of the second wavelength to pass through, the converted light L3 with the second wavelength can pass through the dichroic beam splitting unit 120. In summary, the light source module 100 of the embodiment of the present invention can recycle the reflected light L21', thereby increasing the light use efficiency. In addition, the reflected light L21 ′ is converted into the converted light L3 by the wavelength conversion unit 140 , which can increase the amount of the converted light L3 incident on the color wheel 130 , thereby increasing the amount of red light and green light filtered out by the color wheel 130 .

[0043] In detail, there are at least two sources of the converted light L3. Figure 2 The second illumination light L22 shown, the other is as Figure 3 The reflected light L21 ′ recovered from the color wheel 130 increases the amount of the converted light L3 incident on the color wheel 130 , thereby increasing the amount of the red light and the green light filtered out by the color wheel 130 .

[0044] In an embodiment, Figure 2 The converted light L3 may be incident on the blue filter region 130B of the color wheel 130, and reflected from the blue filter region 130B back to the wavelength conversion unit 140 for recycling. Figure 3 The converted light L3 can be incident on the red filter area 130R or the green filter area 130G of the color wheel 130, and the red light or the green light is filtered out. Figure 3 Not shown, but Figure 2 The optical path of the conversion light L3 can also occur simultaneously Figure 3 of the light path.

[0045] like Figure 2 As shown, the condenser lens 150 includes a first portion 151 and a second portion 152, and the first illumination light L21 passes through the first portion 151. Figure 3As shown, after the first illumination light L21 is reflected from the color wheel 130, the reflected light L21′ can pass through the second portion 152 to the wavelength conversion unit 140. In this embodiment, the reflected light L21′ may not pass through the first portion 151, and thus will not be blocked by the bidirectional beam splitting unit 120 and can mostly or almost all be incident on the second collimating lens 170 or the wavelength conversion unit 140.

[0046] like Figure 3 As shown, the optical axis 150A of the focusing lens 150 is located between the first portion 151 and the second portion 152. The dichroic beam splitting unit 120 corresponds to the first portion 151 along the extension direction of the optical axis 150A. For example, the entire dichroic beam splitting unit 120 corresponds to the first portion 151 along the extension direction of the optical axis 150A, or the entire dichroic beam splitting unit 120 is located on one side of the extension line 150L of the optical axis 150A. In this way, the dichroic beam splitting unit 120 will not block the reflected light L21' reflected from the color wheel 130. In addition, the dichroic beam splitting unit 120 has a turning point 120P, and the turning point 120P can be located on the extension line 150L of the optical axis 150A of the focusing lens 150 (for example, overlapping the extension line 150L), or spaced apart from the extension line 150L of the optical axis 150A by a distance.

[0047] In addition, in this embodiment, the angle A2 between the optical axis 150A of the condenser lens 150 and the first reflective surface 120s1 of the bidirectional beam splitting unit 120 is, for example, 45 degrees, but this is not intended to limit the embodiment of the present invention.

[0048] The first collimating lens 160 is located between the bidirectional beam splitting unit 120 and the first light source 110. The turning point 120P of the bidirectional beam splitting unit 120 is located on the extension line 160L of the optical axis 160A of the first collimating lens 160, so that the light amounts of the first part L11 and the second part L12 of the first light L1 incident on the first reflecting portion 121 and the second reflecting portion 122 are substantially equal. In another embodiment, the bidirectional beam splitting unit 120 can be adjusted along the direction of the extension line 150L of the bidirectional beam splitting unit 120, so that the turning point 120P of the bidirectional beam splitting unit 120 is not located on the extension line 160L of the optical axis 160A of the first collimating lens 160. In this embodiment, the angle A3 between the first reflecting surface 120s1 of the bidirectional beam splitting unit 120 and the optical axis 160A of the first collimating lens 160 is 135 degrees.

[0049] like Figure 2 As shown, the second collimating lens 170 is located between the bidirectional beam splitting unit 120 and the wavelength conversion unit 140. The second collimating lens 170 includes a third portion 171 and a fourth portion 172. The second illumination light L22 passes through the third portion 171 to the wavelength conversion unit 140, and the reflected light L21' (shown in FIG. 1 ) reflected from the color wheel 130 Figure 3 ) passes through the fourth portion 172 to the wavelength conversion unit 140. In the present embodiment, the bidirectional beam splitting unit 120. The optical axis 170A of the second collimating lens 170 is located between the third portion 171 and the fourth portion 172, and the bidirectional beam splitting unit 120 corresponds to the third portion 171 along the extension direction of the optical axis 170A of the second collimating lens 170. For example, the entire bidirectional beam splitting unit 120 corresponds to the third portion 171 along the extension direction of the optical axis 170A, or the entire bidirectional beam splitting unit 120 is located on one side of the extension line 170L of the optical axis 170A. In this way, the bidirectional beam splitting unit 120 will not block the reflected light L21' (the reflected light L21' is shown in Figure 3 In addition, the turning point 120P of the bidirectional beam splitting unit 120 may be located on the extension line 170L of the optical axis 170A of the second collimating lens 170 (eg, overlapped with the extension line 170L), or may be spaced apart from the extension line 170L of the optical axis 170A by a distance.

[0050] like Figure 2 As shown, an extension line 150L of the optical axis 150A of the condensing lens 150 and an extension line 170L of the optical axis 170A of the second collimating lens 170 substantially coincide with each other, but this is not intended to limit the embodiment of the present invention.

[0051] In addition, if Figure 3 As shown, the angle A4 between the second reflective surface 120s2 of the bidirectional beam splitting unit 120 and the optical axis 170A of the second collimating lens 170 is 45 degrees. The wavelength conversion unit 140 converts the second illumination light L22 into converted light L3, and the converted light L3 passes through the second collimating lens 170 to the color wheel 130.

[0052] The values ​​of the angles A2-A4 may be determined by the angle A1 between the first reflective portion 121 and the second reflective portion 122 of the bidirectional beam splitting unit 120 and / or the orientation (or posture) of the bidirectional beam splitting unit 120, and are not limited in the embodiment of the present invention.

[0053] Please refer to Figure 6 , which is a schematic diagram of a light source module 200 according to another embodiment of the present invention. The light source module 200 includes a first light source 110, a bidirectional beam splitting unit 120, a color wheel 130, a wavelength conversion unit 240, a focusing lens 150, a first collimating lens 160, a second collimating lens 170 and a second light source 210. The light source module 200 of this embodiment has the same or similar technical features as the light source module 100, except that the light source module 200 further includes a second light source 210 and the wavelength conversion unit 240 is located between the second light source 210 and the color wheel 130.

[0054] The type of the second light source 210 may be the same as that of the first light source 110 , and will not be described in detail herein.

[0055] like Figure 6 As shown, the second light source 210 can emit a second light L4 to the color wheel 130 via the wavelength conversion unit 240. In an embodiment, the wavelength conversion unit 240 and the second light source 210 can be integrated into a light source package. For example, in a packaging process, the wavelength conversion unit 240 can cover the second light source 210, wherein the wavelength conversion unit 240 and the second light source 210 form a package. In another embodiment, after the wavelength conversion unit 240 and the second light source 210 are manufactured separately, the wavelength conversion unit 240 can be arranged adjacent to (but not in contact with) the second light source 210, or directly attached to the second light source 210.

[0056] The wavelength conversion unit 240, for example, includes a plurality of fluorescent particles 241 to convert the wavelength of the second light L4. For example, the first wavelength of the second light L4 is converted into the converted light L5 having the second wavelength. In the embodiment, the second light L4 is blue light, and the converted light L5 is yellow light. In addition, the wavelength conversion unit 240 can also convert the wavelength of light from the color wheel 130. For example, the reflected light L21' (e.g., blue light) and the second illumination light L22 (e.g., blue light) having the first wavelength are converted into the converted light L3 having the second wavelength. The converted light L3 and the converted light L5 can sequentially pass through the second collimating lens 170, the bidirectional beam splitting unit 120 and the focusing lens 150 to the color wheel 130.

[0057] also, Figure 1 The light source module 100 of the projection device 10 may also be replaced by the light source module 200 .

[0058] In summary, an embodiment of the present invention provides a light source module, wherein a bidirectional beam splitting unit can split a first light into a first illumination light and a second illumination light, and the first illumination light and the second illumination light are provided to a color wheel and a wavelength conversion unit, respectively. The second illumination light is converted into converted light by the wavelength conversion unit and provided to the color wheel. In an embodiment, the reflected light of the second illumination light from the color wheel can be recycled to the wavelength conversion unit for reuse to improve light use efficiency.

[0059] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A light source module, characterized in that: include: A first light source, used to emit a first light; A bidirectional beam splitting unit, relative to the first light source, is used to reflect part of the first light along a first direction as a first illumination light and to reflect part of the first light along a second direction as a second illumination light, the first direction is opposite to the second direction, wherein the bidirectional beam splitting unit comprises a first reflecting portion and a second reflecting portion, the second reflecting portion is connected to the first reflecting portion, the first reflecting portion is used to reflect the first part of the first light into the first illumination light, the second reflecting portion is used to reflect the second part of the first light into the second illumination light, and the bidirectional beam splitting unit is V-shaped; A color wheel, opposite to the bidirectional light splitting unit and receiving at least the first illumination light, the color wheel having a blue filter area, a green filter area and a red filter area; and A condenser lens is located between the bidirectional beam splitter unit and the color wheel. The condenser lens includes a first portion and a second portion. The optical axis of the condenser lens is located between the first portion and the second portion. The bidirectional beam splitter unit corresponds to the first portion along the extension direction of the optical axis. The first illumination light is projected onto the color wheel through the first portion. A wavelength conversion unit, opposite to the color wheel and the dichroic light splitting unit, for at least receiving the second illumination light and providing converted light to the color wheel; The first illumination light becomes reflected light after being reflected from the color wheel, and the reflected light is projected to the wavelength conversion unit through the second part.

2. The light source module according to claim 1, characterized in that: The bidirectional light splitting unit has a turning point, and the turning point is located on the extension line of the optical axis of the condenser lens.

3. The light source module according to claim 1, characterized in that: The bidirectional light splitting unit has a first reflection surface, and the angle between the first reflection surface and the optical axis of the focusing lens is 45 degrees.

4. The light source module according to claim 1, characterized in that: Also includes: The first collimating lens is located between the bidirectional light splitting unit and the first light source.

5. The light source module according to claim 4, characterized in that: The bidirectional light splitting unit has a turning point, and the turning point is located on the extension line of the optical axis of the first collimating lens.

6. The light source module according to claim 4, characterized in that: The bidirectional light splitting unit has a first reflecting surface, and the angle between the first reflecting surface and the optical axis of the first collimating lens is 135 degrees.

7. The light source module according to claim 1, characterized in that: Also includes: A second collimating lens is located between the bidirectional light splitting unit and the wavelength conversion unit, the second collimating lens includes a third portion and a fourth portion, and the second illumination light is projected to the wavelength conversion unit through the third portion; The wavelength conversion unit converts the second illumination light into converted light, and the converted light is projected onto the color wheel through the second collimating lens.

8. The light source module according to claim 7, characterized in that: The bidirectional light splitting unit has a turning point, and the turning point is located on the extension line of the optical axis of the second collimating lens.

9. The light source module according to claim 7, characterized in that: The bidirectional light splitting unit has a second reflecting surface, and the included angle between the second reflecting surface and the optical axis of the second collimating lens is 45 degrees.

10. The light source module according to claim 7, characterized in that: The optical axis of the second collimating lens is located between the third portion and the fourth portion, and the bidirectional light splitting unit corresponds to the third portion along the extending direction of the optical axis of the second collimating lens.

11. The light source module according to claim 1, wherein: Also includes: A focusing lens is located between the bidirectional beam splitting unit and the color wheel; and A second collimating lens is located between the bidirectional light splitting unit and the wavelength conversion unit; Wherein, an extension line of the optical axis of the condensing lens coincides with an extension line of the optical axis of the second collimating lens.

12. The light source module according to claim 1, wherein: The bidirectional light splitting unit comprises: A first reflecting portion, configured to reflect a portion of the first light into the first illumination light; and A second reflecting portion, connected to the first reflecting portion and used for reflecting a portion of the first light into the second illumination light; Wherein, an included angle between the first reflecting portion and the second reflecting portion is less than 180 degrees.

13. The light source module according to claim 1, characterized in that: The first light includes light of a first wavelength, the converted light includes light of a second wavelength, the first wavelength is different from the second wavelength; the dichroic light splitting unit reflects the light of the first wavelength and allows the light of the second wavelength to penetrate.

14. The light source module according to claim 1, wherein: Also includes: The second light source is used to emit a second light, and the second light is projected onto the color wheel via the wavelength conversion unit.

15. The light source module according to claim 14, characterized in that: The first light includes light of a first wavelength, the converted light includes light of a second wavelength, the first wavelength being different from the second wavelength; the second light includes light of the first wavelength, or the second light includes light of the second wavelength.

16. The light source module according to claim 13 or 15, characterized in that: The first wavelength is less than or equal to 460 nanometers, and the second wavelength is greater than or equal to 460 nanometers and less than or equal to 680 nanometers.

17. The light source module according to claim 1, characterized in that: At least one of the green filter area and the red filter area is also used for reflecting the first illumination light.

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