Color wheel and light source system and projection system using the same

Abstract

The present invention relates to a color wheel and a light source system and a projection system using the color wheel. The color wheel includes a front substrate and a rear substrate that allow light to pass through, and a dichroic film, a first low refractive index layer, a fluorescent film, a second low refractive index layer and a filter film that are sequentially arranged between the front substrate and the rear substrate. The dichroic film transmits the first light and reflects the second light. The dichroic film includes at least one first color light area that absorbs the first light to generate the second light. The filter film includes at least one first light-transmitting area corresponding to the first color light area. The first light-transmitting area allows the second light or the third light separated from the second light to pass through and reflects other light. By using the present invention, the light energy utilization rate is high.

Description

Technical Field

[0001] The present invention relates to the field of projection display, and in particular to a color wheel and a light source system and a projection system using the color wheel. Background Art

[0002] See also Figure 1 , which is a schematic diagram of the layer structure of a color wheel in the prior art. The color wheel includes a glass layer 11, a fluorescent layer 12 and a filter layer 13. The fluorescent layer 12 is coated on one surface of the glass layer 11, and the filter layer 13 is arranged on the fluorescent layer 12. The excitation light penetrates the glass layer 11 and reaches the fluorescent layer 12. The fluorescent layer 12 absorbs the excitation light and generates a stimulated light. Since the stimulated light follows the Lambertian distribution, it will be emitted in all directions. Therefore, in addition to a part of the light passing through the filter layer, another part of the stimulated light will be emitted from the incident side of the excitation light, thereby causing a loss of the stimulated light and resulting in low light utilization. Summary of the invention

[0003] In view of the above situation, the present invention provides a color wheel, a light source system and a projection system with high light energy utilization efficiency.

[0004] On the one hand, the present invention provides a color wheel, which includes a front substrate and a rear substrate that allow light to pass through, and a diaphragm, a first low refractive index layer, a fluorescent film, a second low refractive index layer and a filter film that are sequentially arranged between the front substrate and the rear substrate, the diaphragm transmits the first light and reflects the second light, the fluorescent film includes at least one first color light area, the first color light area absorbs the first light to generate the second light, the filter film includes at least one first light-transmitting area corresponding to the first color light area, the first light-transmitting area allows the second light or the third light separated from the second light to pass through and reflects other light, wherein the first light that is not absorbed by the first color light area is at least partially reflected by the first light-transmitting area, enters the first color light area via the second low refractive index layer, is absorbed by the first color light area and generates the second light again, the regenerated second light is reflected by the diaphragm, enters the first color light area via the first low refractive index layer, and then reaches the first light-transmitting area via the first color light area and the second low refractive index layer, the first light-transmitting area transmits the second light or separates the third light from the second light and transmits the third light.

[0005] On the other hand, the present invention further provides a light source system, which includes a light emitting unit and the above-mentioned color wheel, wherein the monochromatic light emitted by the light emitting unit is converted into polychromatic light by the color wheel for emission.

[0006] On the other hand, the present invention also provides a projection system, which includes the above-mentioned light source system, a spatial light modulator and a projection lens. The multi-color light emitted from the light source system is modulated by the spatial light modulator into image light carrying image information, and the image light is emitted to a screen via the projection lens.

[0007] The advantages of the color wheel, light source system and projection system provided by the embodiments of the present invention are: since a spectroscopic film is arranged inside the color wheel and a low refractive index layer is arranged between the fluorescent film, the spectroscopic film and the filter film, the first light that passes through the fluorescent film but is not absorbed by the fluorescent film can be reflected back by the filter film, pass through the fluorescent film again to be absorbed and generate second light again, and at least part of the second light generated again can be reflected back to the fluorescent film by the spectroscopic film, and pass through the fluorescent film and the filter film to be emitted, or, the third light is separated from the second light generated again, and the third light is emitted through the filter film, thereby improving the light utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural schematic diagram of a color wheel in the prior art.

[0009] Figure 2 The figure is a schematic structural diagram of a color wheel according to an embodiment of the present invention.

[0010] Figure 3 for Figure 2 Schematic diagram of the segment division of the fluorescent film in the color wheel shown.

[0011] Figure 4 for Figure 2 Schematic diagram of the segment division of the filter film in the color wheel shown.

[0012] Figure 5 Schematic diagram of laser emission when the fluorescent film and the filter film are directly bonded.

[0013] Figure 6 Schematic diagram of laser emission when the fluorescent film and the blue-transmitting and yellow-reflecting film are directly bonded together.

[0014] Figure 7 It is a block diagram of a light source system in one embodiment of the present invention.

[0015] Figure 8 It is a block diagram of a projection system in one embodiment of the present invention. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs. The term "or / and" used herein includes any and all combinations of one or more of the associated listed items.

[0018] See also Figure 2 , which is a schematic diagram of the structure of an embodiment of the color wheel of the present invention. The color wheel 2 is roughly disc-shaped when viewed from the front and back (not shown), and includes a sapphire sheet 21 arranged on the front and a glass sheet 22 arranged on the back. When viewed from the side, the sapphire sheet 21 and the glass sheet 22 are spaced apart. In the middle area of ​​the color wheel 2, an adhesive layer 23 is arranged between the sapphire sheet 21 and the glass sheet 22, and the sapphire sheet 21 and the glass sheet 22 are bonded and fixed by the adhesive layer 23. In the peripheral area of ​​the color wheel 2, an anti-reflection film 24 is arranged on the side of the sapphire sheet 21 away from the glass sheet 22, and a blue-transmitting and yellow-reflecting film 25, a fluorescent film 26 and a filter film 27 are arranged in sequence between the sapphire sheet 21 and the glass sheet 22. The anti-reflection film 24, the blue-transmitting yellow-reflecting film 25, the fluorescent film 26 and the filter film 27 are all roughly annular, so that they can be arranged around the peripheral area of ​​the color wheel 2. The blue-transmitting yellow-reflecting film 25 is stacked on the sapphire sheet 21, and the filter film 27 is stacked on the glass sheet 22. The fluorescent film 26 is separated from the blue-transmitting yellow-reflecting film 25 and the filter film 27. In this embodiment, the fluorescent film 26 is separated from the blue-transmitting yellow-reflecting film 25 and the filter film 27 by about 10 μm. Dry glass powder layers 28 and 29 are respectively arranged between the fluorescent film 26 and the blue-transmitting yellow-reflecting film 25 and the filter film 27. The thickness of each dry glass powder layer 28 and 29 is also roughly 10 μm, so that the sapphire sheet 21 and the glass sheet 22 physically support or clamp the fluorescent film 26.

[0019] In this embodiment, the fluorescent film 26 contains resin and glue, so the dry glass powder layers 28 and 29 can be adsorbed on both sides of the fluorescent film 26 by spraying, thereby hardening the fluorescent film to a certain extent.

[0020] In the present embodiment, the thickness of the fluorescent film 26 is approximately 100 μm.

[0021] See also Figure 3As shown, the fluorescent film 26 is provided with a red light area 261, a green light area 262, a blue light area 263 and a yellow light area 264 in sequence along its circumferential direction. The red light area 261 and the yellow light area 264 are formed by mixing resin, glue and yellow phosphor, the green light area 262 is formed by mixing resin, glue and green phosphor, and the blue light area is formed by mixing resin, glue and scattering powder. In this embodiment, the central angles corresponding to the red light area 261, the green light area 262, the blue light area 263 and the yellow light area 264 are 115 degrees, 92 degrees, 70 degrees and 83 degrees respectively.

[0022] See also Figure 4 As shown, corresponding to the arrangement of the red light area 261, the green light area 262, the blue light area 263 and the yellow light area 264 on the fluorescent film 26, the filter film 27 is sequentially provided with a red light-transmitting area 271, a green light-transmitting area 272, an anti-reflection area 273 and a yellow light-transmitting area 274 along its circumferential direction. In the present embodiment, the red light-transmitting area 271 is provided with a red light-transmitting film, the green light-transmitting area 272 is provided with a green light-transmitting film, the anti-reflection area 273 is provided with an anti-reflection film, and the yellow light-transmitting area 274 is provided with a yellow light-transmitting film.

[0023] In this embodiment, since the dry glass powder layers 28 and 29 are formed by adsorbing dry glass particles on the fluorescent film 26, there is an air gap between the dry glass powder layer 28 and the blue-transmitting yellow-reflecting film 25, the fluorescent film 26 and the filter film 27. Due to the presence of the blue-transmitting yellow-reflecting film 25 and the air gap, part of the light reflected by the filter film 27 will be reused and finally pass through the filter film 27 and the glass sheet 22 to be emitted, thereby improving the light utilization rate. The optical function of the color wheel 2 is described below by taking blue light, specifically blue laser, incident on the color wheel 2 and generating red light through the color wheel 2 as an example.

[0024] The excitation blue light sequentially transmits the anti-reflection film 24, the sapphire sheet 21, the blue-transmitting and yellow-reflecting film 25, passes through the air gap and the dry glass powder layer 28, and irradiates the fluorescent film 26, irradiating the yellow phosphor in the red light area 261 of the fluorescent film 26 to produce the stimulated yellow light. The yellow light emitted from the fluorescent film 26 at least partially passes through the air gap and the dry glass powder layer 29 and then irradiates the red light-transmitting area 271 of the filter film 27, and the yellow light is divided into red light and green light, wherein the red light transmits the filter film 27 and then further transmits the glass sheet 22 and is emitted, and the green light and the unabsorbed blue light are reflected by the red light-transmitting area 271 of the filter film 27. After the reflected blue light passes through the fluorescent film 26, it excites the fluorescent film 26 to generate yellow light again. The yellow light generated again passes through the dry glass powder layer 28 and the air gap and irradiates the blue-transmitting yellow-reflecting film 25. After being reflected by the blue-transmitting yellow-reflecting film 25, it passes through the dry glass powder layer 28, the fluorescent film 26 and the dry glass powder layer 29, and at least partially passes through the red light-transmitting area 271 of the filter film 27 and the glass sheet 22 to be emitted, thereby increasing the brightness of the emitted red light and improving the light utilization rate.

[0025] In the above embodiment, the dry glass powder layer 29 is not completely attached to the fluorescent film 26 and the filter film 27. Between the dry glass powder layer 29 and the fluorescent film 26, some dry glass particles in the dry glass powder layer 29 are attached to the fluorescent film 26, and except for the area where these dry glass particles are in contact with the fluorescent film 26, an air gap is formed between the dry glass powder layer 29 and the fluorescent film 26. Since the refractive index of air (refractive index 1) and the fluorescent film 26 (refractive index 1.5-1.8) is far different, light incident at a large angle will be totally reflected when it reaches the interface between the fluorescent film 26 and the dry glass powder layer 29. Similarly, an air gap is formed between the dry glass powder layer 29 and the filter film 27. Since the refractive index of air and the filter film 27 is far different, light incident at a large angle will be totally reflected when it reaches the interface between the filter film 27 and the dry glass powder layer 29. In this way, the fluorescent film 26 and the filter film 27 are not directly attached. Since the refractive indexes of the fluorescent film 26 and the filter film 27 are similar, the incident light is allowed to pass through the filter film 27 and the glass sheet 22, so that the blue light that is not absorbed by the fluorescent film 26 can be reflected by the filter film 27 to the fluorescent film 26, and absorbed by the fluorescent film 26 to generate yellow light again. Figure 5 As shown, if the fluorescent film 26 and the filter film 27 are directly attached without adding a dry glass powder layer 29, during the period when the color wheel 2 emits red light, the green light or the blue light not absorbed by the fluorescent film 26 will penetrate the filter film 27 and further transmit to the glass sheet 22, and at least part of the green light or blue light will be emitted from the circumferential surface of the glass sheet 22, thereby failing to achieve the effect of reflecting blue and green light. If an anti-reflection film is provided on the side of the glass sheet 22 away from the filter film 27, part of the blue light and green light will be emitted from the side of the glass sheet 22 away from the filter film 27, thereby failing to achieve the effect of reflecting blue and green light.

[0026] Similarly, a dry glass powder layer 28 is provided between the fluorescent film 26 and the blue-transparent yellow-reflecting film 25. Since the refractive indexes of air, the fluorescent film 26 and the blue-transparent yellow-reflecting film 25 are quite different, the blue-transparent yellow-reflecting film 25 is prevented from being directly attached to the fluorescent film 26. Since the refractive indexes of the two are similar, the incident light is allowed to pass through the blue-transparent yellow-reflecting film 25 and the sapphire sheet 21 to be emitted, so that the yellow light generated by the fluorescent film 26 can be reflected by the blue-transparent yellow-reflecting film 25 and finally emitted from the filter film 27, so as to improve the light utilization rate. Figure 6As shown, if the fluorescent film 26 and the blue-transmitting yellow-reflecting film 25 are directly attached without a dry glass powder layer 28, and the anti-reflection film 24 is not provided on the side of the sapphire sheet 21 away from the blue-transmitting yellow-reflecting film 25, part of the yellow light is emitted from the circumferential surface of the sapphire sheet 21 and lost. In the case where the anti-reflection film 24 is provided on the side of the sapphire sheet 21 away from the blue-transmitting yellow-reflecting film 25, at least part of the yellow light will further penetrate the anti-reflection film 24 and be lost. If the positions of the sapphire sheet 21 and the blue-transmitting yellow-reflecting film 25 are exchanged, based on the same principle, the converted light will also be lost.

[0027] Therefore, low-refractive-index dry glass powder layers 28 and 29 are arranged on both sides of the fluorescent film 26, which is beneficial for the blue light that is not absorbed by the fluorescent film 26 to be reflected back to the fluorescent film 26 again, so that the fluorescent film 26 can generate yellow light again. The regenerated yellow light can at least be partially reflected and finally emit red light through the filter film 27 and the glass sheet 22, thereby increasing the brightness of the red light and improving the light utilization rate.

[0028] On the other hand, due to the large difference in refractive index between the fluorescent film 26 and the air gap, when the fluorescence generated from the inside of the fluorescent film 26 is emitted at a large angle to the interface between the fluorescent film 26 and the air gap, the fluorescence will be reflected, while the fluorescence at a small angle will be emitted from the fluorescent film 26, so that most of the fluorescence emitted from the side of the fluorescent film 26 close to the filter film 27 is roughly the same as the incident direction of the excitation light, and most of the fluorescence emitted from the side of the fluorescent film 26 close to the blue-transmitting yellow-reflecting film 25 is roughly opposite to the incident direction of the excitation light. The fluorescence emitted from the side of the fluorescent film 26 close to the blue-transmitting yellow-reflecting film 25 further penetrates the fluorescent film 26 after being reflected by the blue-reflecting yellow-transmitting film 25 and is emitted from the side of the fluorescent film 26 close to the filter film 27. Therefore, the existence of the air gap helps more fluorescence to be emitted from the side of the fluorescent film 26 close to the filter film 27 in a direction roughly the same as the incident direction of the excitation light, which helps to collect fluorescence and improve light utilization.

[0029] Similarly, using blue light to generate green light and yellow light via the color wheel 2 can increase the brightness of the emitted green light and yellow light.

[0030] It is understandable that in other embodiments, the fluorescent film 26 can be formed by mixing fluorescent powder and glass powder and then sintering. The fluorescent powder and glass powder are mixed and placed on a substrate for sintering. After sintering, the substrate and the fluorescent film 26 are separated.

[0031] It is understood that in other embodiments, the blue-transmissive yellow-reflective film 25 may only allow blue light incident at a small angle to be transmitted, for example, only allow blue light incident at an angle of 0 to 20 degrees to the optical axis of the blue-transmissive yellow-reflective film 25 to be transmitted.

[0032] It can be understood that in other embodiments, the dry glass powder layers 28 and 29 can also be replaced by other low refractive index layers such as porous silica layers, and the refractive index of the low refractive index layer is below 1.3, preferably, below 1.2.

[0033] It is understandable that in other embodiments, an anti-reflection film may also be provided on the side of the glass sheet 22 away from the fluorescent film 26 .

[0034] It is understood that in other embodiments, the thickness of the dry glass powder layers 28 and 29 is not limited to 10 μm, but can be any value less than 50 μm, preferably 10-15 μm. The thickness of the fluorescent film 26 is also not limited to 100 μm, but can be any value less than 200 μm.

[0035] It can be understood that the central angles of the red light area 261 , the green light area 262 , the blue light area 263 and the yellow light area 264 on the fluorescent film 26 can be changed according to actual needs.

[0036] It can be understood that the fluorescent film 26 may only include the red light area 261 , the green light area 262 and the blue light area 263 , and correspondingly, the filter film 27 may only include the red light transmitting area 271 , the green light transmitting area 272 and the anti-reflection area 273 .

[0037] In the above embodiment, the blue-transmissive yellow-reflective film 25 transmits the first light (blue light) and reflects the second light (yellow light). Therefore, the blue light can enter the fluorescent film 26 through the blue-transmissive yellow-reflective film 25. The fluorescent film 26 at least includes a first color light area such as a red light area 261, a green light area 262 and / or a yellow light area 264. The first color light area absorbs the first light to generate the second light. The second light is separated into a third light (red light or green light) and transmitted through the filter film 27. Alternatively, the second light is directly transmitted through the filter film 27. The fluorescent film 26 may also include a second color light area such as a blue light area. The second color light area allows the first light to directly pass through the fluorescent film 26 and finally be transmitted through the filter film 27. Accordingly, the filter film 27 includes at least one first light-transmitting area, such as a red light-transmitting area 271, a green light-transmitting area 272, and / or a yellow light-transmitting area 274, corresponding to the first color light area of ​​the fluorescent film 26. The first light-transmitting area allows the second light or the third light to pass through and reflects other light. Therefore, the first light not absorbed by the fluorescent film 26 will be reflected back to the fluorescent film 26 by the first light-transmitting area, absorbed by the fluorescent film 26 and re-generated second light. After the re-generated second light is emitted to the blue-transmitting yellow-reflecting film 25, it is reflected by the blue-transmitting yellow-reflecting film 25, passed through the fluorescent film 26, and finally transmitted from the first light-transmitting area of ​​the filter film 27. Alternatively, the re-generated second light is separated from the third light by the first light-transmitting area of ​​the filter film 27 and the third light is transmitted. The filter film 27 may include a second light-transmitting area corresponding to the second color light area of ​​the fluorescent film 26, and the second light-transmitting area allows the first light to pass through. In other embodiments, the blue-transmitting yellow-reflecting film 25 may be replaced by a combined film for light splitting. For example, in an embodiment where the color wheel 2 receives blue light and emits red light, green light, and blue light, the blue-transmitting yellow-reflecting film 25 may be composed of a combination of a blue-transmitting red-reflecting film and a blue-transmitting green-reflecting film. In addition, in other embodiments, the first light is not limited to blue light, the second light is not limited to yellow light, and the third light is not limited to red light or green light. Based on the different first light, second light, and / or third light selected, the blue-transmitting yellow-reflecting film 25 may be replaced by other light splitting films.

[0038] In the above embodiments, the sapphire sheet 21 and the glass sheet 22 respectively constitute the front substrate and the rear substrate of the color wheel 2. In other embodiments, the front substrate of the color wheel 2 may be a quartz sheet or a glass sheet, and the rear substrate may also be a quartz sheet or a sapphire sheet.

[0039] See also Figure 7 As shown, it is a block diagram of a light source system. The light source system 100 includes a color wheel 2 and a light emitting unit 3. Monochromatic light such as blue light emitted from the light emitting unit 3 is converted into multi-color light such as red, green, blue and yellow light by the color wheel 2.

[0040] See also Figure 8, which is a schematic block diagram of a projection system, the projection system 200 includes a light source system 100, a spatial light modulator 4 and a projection lens 5. The polychromatic light emitted from the light source system 100 is modulated by the spatial light modulator 4 into image light carrying image information, and finally emitted to the screen through the projection lens 5.

[0041] In summary, the color wheel, light source system and projection system provided by the embodiments of the present invention have a spectroscopic film arranged inside the color wheel and a low refractive index layer arranged between the fluorescent film, the spectroscopic film and the filter film, so that the first light that passes through the fluorescent film but is not absorbed by the fluorescent film can be reflected back by the filter film, pass through the fluorescent film again to be absorbed and generate second light again, and at least part of the second light generated again can be reflected back to the fluorescent film by the spectroscopic film, and pass through the fluorescent film and the filter film to be emitted, or, the third light is separated from the second light generated again, and the third light is emitted through the filter film, thereby improving the light utilization rate.

[0042] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention is described in detail with reference to the above preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A color wheel, characterized in that: The color wheel includes a front substrate and a rear substrate that allow light to pass through, and a splitter film, a first low refractive index layer, a fluorescent film, a second low refractive index layer and a filter film that are sequentially placed between the front substrate and the rear substrate, the splitter film transmits the first light and reflects the second light, the fluorescent film includes at least one first color light area, the first color light area absorbs the first light to generate the second light, the filter film includes at least one first light-transmitting area corresponding to the first color light area, the first light-transmitting area allows the second light or the third light separated from the second light to pass through and reflects other light, wherein the first light that is not absorbed by the first color light area is at least partially reflected by the first light-transmitting area, and the second light is reflected by the second light-transmitting area. The second low refractive index layer enters the first color light area, is absorbed by the first color light area and generates second light again, the second light is reflected by the splitter film, enters the first color light area via the first low refractive index layer, and then reaches the first light-transmitting area via the first color light area and the second low refractive index layer, the first light-transmitting area transmits the second light or separates a third light from the second light and transmits the third light, the first low refractive index layer is a dry glass powder layer, and / or the second low refractive index layer is a dry glass powder layer, the fluorescent film includes resin and glue, and the dry glass powder layer is formed by adsorbing dry glass particles on the fluorescent film.

2. The color wheel according to claim 1, characterized in that The fluorescent film includes a second color light area, the second color light area transmits the first light, and the filter film includes a second light-transmitting area corresponding to the second color light area, the second color light area transmits the first light transmitted through the second color light area.

3. The color wheel according to claim 1, wherein: It also includes an anti-reflection film arranged on a side of the front substrate away from the beam splitting film.

4. The color wheel according to claim 1, wherein: The beam splitting film, the first low refractive index layer, the fluorescent film, the second low refractive index layer and the filter film are arranged in the peripheral area of ​​the color wheel.

5. The color wheel according to claim 4, characterized in that The middle area of ​​the color wheel includes an adhesive layer, and the adhesive layer is used to bond and fix the front substrate and the rear substrate.

6. The color wheel according to claim 1, wherein: The front substrate is a sapphire sheet, a glass sheet or a quartz sheet, and / or the rear substrate is a glass sheet, a quartz sheet or a sapphire sheet.

7. The color wheel according to claim 2, characterized in that: The dichroic film is a blue-transmitting and yellow-reflecting film, the first light is blue light, and the second light is yellow light.

8. The color wheel according to claim 7, characterized in that The fluorescent film includes three first color light areas, namely, a red light area, a green light area and a yellow light area; the filter film includes three first light-transmitting areas, namely, a red light-transmitting area, a green light-transmitting area and a yellow light-transmitting area; the red light-transmitting area corresponds to the red light area, the green light-transmitting area corresponds to the green light area, the yellow light-transmitting area corresponds to the yellow light area; the second color light area is a blue light area; the second light-transmitting area is an enhanced transmittance area; and the third light is red light or green light.

9. The color wheel according to claim 8, characterized in that The red light area and the yellow light area are provided with yellow phosphor, the green light area is provided with green phosphor, the blue light area is provided with scattering powder, the red light-transmitting area is provided with a red light-transmitting film, the green light-transmitting area is provided with a green light-transmitting film, the yellow light-transmitting area is provided with a yellow light-transmitting film, and the anti-reflection area is provided with an anti-reflection film.

10. The color wheel according to claim 1, wherein: The refractive index of the first low refractive index layer is 1.3 or 1.2 or less, and / or the refractive index of the second low refractive index layer is 1.3 or 1.2 or less.

11. The color wheel according to claim 10, characterized in that The thickness of the first low refractive index layer is less than 50 μm or is 10-15 μm, and / or the thickness of the second low refractive index layer is less than 50 μm or is 10-15 μm.

12. The color wheel according to claim 1, wherein: The thickness of the fluorescent film is less than 200 μm, or the thickness of the fluorescent film is 100 μm.

13. The color wheel according to claim 1, wherein: The prismatic film only allows the first light to be transmitted at an angle of 0 to 20 degrees to the optical axis of the prismatic film.

14. A light source system, characterized in that: The invention comprises a light-emitting unit and a color wheel as claimed in any one of claims 1 to 13, wherein the monochromatic light emitted by the light-emitting unit is converted by the color wheel into polychromatic light for emission.

15. A projection system, characterized in that: It comprises the light source system as claimed in claim 14, as well as a spatial light modulator and a projection lens, wherein the polychromatic light emitted from the light source system is modulated by the spatial light modulator into image light carrying image information, and the image light is emitted to a screen via the projection lens.

Images