CN111856858B - A light source system and projection system - Google Patents

Abstract

The invention provides a light source system. The light source system includes a first light source for emitting first light; a wavelength conversion device for performing wavelength conversion on part of the first light to obtain second light; a first beam splitter including a first a region for guiding part of the first light to the wavelength conversion device and a second region for guiding part of the first light to the first light combiner, and a second region for guiding the first light To the wavelength conversion device and the first optical combiner, used to guide part of the first light emitted from the first region and part of the second light emitted by the wavelength conversion device to emit along the same optical path. The invention also provides a projection system. The light source system provided by the present invention converts part of the first light into second light, and combines the second light with part of the first light to correct the color coordinates of the first light so as to meet the coordinate value requirements of the primary color light required by the DCI standard. And it can further improve the color gamut range and reduce the cost of the light source.

Description

A light source system and projection system

technical field

The invention belongs to the technical field of projection display, and in particular relates to a light source system and a projection system.

Background technique

In the laser light source system, blue laser is usually used as the blue primary color for display. Considering the electro-optical conversion efficiency of lasers and the service life of optical devices, the dominant wavelength of blue lasers commonly used in laser light sources is 455nm. Limited by the manufacturing process, generally the dominant wavelength of the laser has a tolerance of about ±5nm.

Cinema projectors using laser light sources must meet the standards of the Digital Cinema Initiative (DCI). When the dominant wavelength of the laser is less than 452nm, its color coordinate y value is less than 0.02, and there will be problems that do not meet the DCI Blu-ray color coordinate standard. The dominant wavelength of the blue laser is selected. At the same time, although the color coordinates of blue lasers greater than 452nm meet the DCI standard, they are biased toward the lower limit of the range of blue light color coordinates. As a result, when the ratio of blue light to red and green light is white light, the proportion of red and green light required is more than that of blue laser light. Reduced utilization or increased costs.

Contents of the invention

In view of this, the present invention provides a light source system. The specific technical scheme is as follows.

A light source system, the light source system comprising:

a first light source, configured to emit first light;

a wavelength conversion device, configured to perform wavelength conversion on part of the first light to obtain second light;

The first beam splitter includes a first area and a second area, the first area is used to guide part of the first light to the wavelength conversion device, and is used to guide part of the first light to the first combination light device, the second region is used to guide the first light to the wavelength conversion device;

The first light combiner is configured to guide part of the first light emitted from the first region and part of the second light emitted by the wavelength conversion device to emit along the same optical path.

In one embodiment, the first beam splitter includes a first surface and a second surface opposite to each other, the first surface is opposite to the first light source, and the first light is incident on the first behind a first region of a surface, the first region of the first surface reflects a portion of the first light to the wavelength conversion device, and transmits a portion of the first light to the first light combiner; or

The first region of the first surface transmits part of the first light to the wavelength conversion device, and reflects part of the first light to the first light combiner.

In one embodiment, an anti-reflection film is provided on the first region of the first surface.

In one embodiment, the first beam splitter can rotate around an axis perpendicular to the first surface, the first beam splitter further includes a second area adjacent to the first area, and the first area The second area and the second area are respectively located on a predetermined optical path in time sequence, and the second area of the first surface is used to reflect the first light to the wavelength conversion device.

In one embodiment, a dichroic film is disposed on the first region of the first surface.

In one embodiment, the light source system further includes a half-wave plate, the half-wave plate is located between the first light source and the first beam splitter, the first light passes through the half-wave plate and then incident on the first region of the first surface.

In one embodiment, the first region of the first surface includes adjacent first sub-regions and second sub-regions, the first sub-region is provided with a high reflection film, and the second sub-region is provided with Anti-reflection coating; the light spot of the first light incident on the first area of the first surface is divided into adjacent first light spots and second light spots, wherein the first light spot of the first light is incident on the high reflection After being reflected on the film, it reaches the wavelength conversion device, and the second light spot of the first light is incident on the anti-reflection film and reaches the first result after passing through the second surface from the anti-reflection film. optical device.

In one embodiment, a reflective mirror is further provided between the first light source and the first beam splitter, and the first light enters the first beam splitter after being reflected by the reflective mirror.

In one embodiment, the light source system further includes a filter, and the wavelength conversion device is a ring structure, and at least includes a wavelength conversion region;

The filter is a ring structure and includes at least one filter area, the filter area is at least used to filter the second light, and the filter is coaxially arranged with the wavelength conversion device .

The present invention also provides a projection system, which includes the light source system as described above.

Beneficial effects of the present invention: the light source system provided by the present invention converts part of the first light into second light, and combines the second light with part of the first light to correct the color coordinates of the first light to meet the requirements of the DCI standard The coordinate value of the primary color light is required, and the color gamut can be further improved to reduce the cost of the light source.

Description of drawings

Fig. 1 is a schematic structural diagram of a light source system provided by the first embodiment of the present invention.

Fig. 2 is a schematic diagram of the front structure of a first optical splitter provided by the first embodiment of the present invention.

Fig. 3 is a schematic side view of a first optical splitter provided by the first embodiment of the present invention.

Fig. 4 is a schematic diagram of the front structure of a first optical splitter provided by the second embodiment of the present invention.

Fig. 5 is a schematic side view of a first optical splitter provided by the second embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a light source system provided by the third embodiment of the present invention.

Fig. 7 is a schematic diagram of the front structure of a first optical splitter provided by the third embodiment of the present invention.

Fig. 8 is a schematic side view of a first beam splitter provided by the third embodiment of the present invention.

Fig. 9 is a schematic structural diagram of a light source system provided by a fourth embodiment of the present invention.

Fig. 10 is a schematic diagram of the front structure of a first optical splitter provided by the fourth embodiment of the present invention.

Fig. 11 is a schematic side view of a first optical splitter provided by the fourth embodiment of the present invention.

Fig. 12 is a schematic structural diagram of a light source system provided by the fifth embodiment of the present invention.

Fig. 13 is a schematic diagram of the front structure of a fluorescent wheel provided by the fifth embodiment of the present invention.

Detailed ways

The following description is a preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also considered Be the protection scope of the present invention.

Referring to FIG. 1 to FIG. 3 , the first embodiment of the present invention provides a light source system 10 . The light source system 10 includes a first light source 100 , a first beam splitter 210 , a wavelength conversion device 310 and a first light combiner 410 . The first light source 100 is used to emit the first light L, and the wavelength conversion device 310 is used to perform wavelength conversion on part of the first light L to obtain the second light. The first beam splitter 210 includes a first area 213, and the first area 213 is used to guide Part of the first light L1 is sent to the wavelength conversion device 310, and is used to guide part of the first light L2 to the first light combiner 410, and the first light combiner 410 is used to guide part of the first light L2 emitted from the first region 213 and the wavelength The second light emitted by the conversion device 310 exits along the same optical path, wherein the percentage range of the first light used to guide the wavelength conversion device 310 is γ, 0<γ<10%, that is, when the first light L1 enters the first region At 213, a small amount of first light enters the wavelength conversion device 310 through reflection, and the first light entering the wavelength conversion device emits the second light through wavelength conversion. It can be understood that at this time, the second light emitted by the wavelength conversion device is also a small amount , a small amount of second light passes through the first light combiner and partially transmits the second light to combine the light, so as to adjust the color coordinates of the outgoing first light.

Wherein the wavelength of the second light is different from the first light L, the second light and part of the first light L2 are emitted along the same optical path, and the second light with a wavelength different from the first light L is added to the first light L to correct The color coordinate value of the first light L is used to obtain the desired target light.

In this embodiment, the first light L can be any kind of light, preferably blue laser light, and the second light can be any kind of fluorescence different from the first light L, preferably green fluorescence or yellow fluorescence, or That is to say, when the first light L is blue laser light and the second light is green fluorescent light, the green fluorescent light and the blue laser light are combined so that the green fluorescent light can correct the color coordinates of the blue light to obtain the required blue light; when the first light L is In the case of blue laser light, when the second light is yellow fluorescence, the yellow fluorescence can be divided into green fluorescence and red fluorescence through the light splitting element, and the separated green fluorescence and blue laser are modulated and displayed by the same spatial light modulator. At this time, the blue The combination of laser light and green fluorescence can also calibrate the blue light color coordinates of the light source system; it should be noted that the first light L is used as the primary color light, and the luminous flux in the combined light channel of this primary color light accounts for a large proportion, and the second light G is used as the primary color light. Calibration light, the luminous flux in the combined light channel of the primary color light accounts for a small proportion. In this embodiment, the first light source 100 is a blue laser light source 100, the blue laser light source 100 is used to generate the blue laser light L, the first beam splitter 210 is used to receive the blue laser light L, the first beam splitter 210 includes at least the first Area 213 and second area 214, wherein the first area 213 receives the blue laser light L and divides the blue laser light L into the first blue laser light L1 and the second blue laser light L2 propagating along different paths; the wavelength conversion device 310 receives the first blue laser light L1 , and convert the first blue laser light L1 into yellow fluorescent powder Y. In this embodiment, the yellow fluorescent powder can be excited by the first blue laser light L1 to generate yellow fluorescent powder Y. In other embodiments, the wavelength conversion device 310 includes green fluorescent powder , the wavelength conversion device 310 is used to receive the first blue laser light L1 and convert the first blue laser light L1 into green fluorescent light G, wherein the wavelength conversion device 310 at least includes a wavelength conversion region corresponding to the central angle of the first region 213 of the first beam splitter 210 ; The first light combiner 410 mixes the fluorescent light emitted by the wavelength conversion device 310 with the second blue laser light L2 to correct the blue light color coordinates of the light source system.

然后根据黄荧光粉激发效率曲线和荧光中红荧光和绿荧光比例，计算第一分光器210对第一蓝激光L1和第二蓝激光L2的分光比例，然后根据该分光比例匹配设置第一分光器210。The calibration process of the color coordinates of the blue laser is described below. Taking the wavelength conversion section of the wavelength conversion device 310 including yellow phosphor as an example, the details are as follows: Let the color coordinates of the second blue laser L2 be (x _B , y _B ), and the first The color coordinates of a blue laser L1 exciting the phosphor to convert to green fluorescence are (x _G , y _G ). At this time, the green fluorescence is generated by the first blue laser L1 to excite the yellow phosphor to produce yellow fluorescence and then split the light. The target blue light color coordinates is (x,y). The ratio (lumen number) of the second blue laser L2 and green fluorescent light required to achieve the target blue light color coordinates is

Then, according to the excitation efficiency curve of the yellow phosphor powder and the ratio of red fluorescence and green fluorescence in the fluorescence, calculate the split ratio of the first beam splitter 210 to the first blue laser L1 and the second blue laser L2, and then set the first split according to the split ratio device 210.

It should be noted that when the wavelength conversion section of the wavelength conversion device 310 includes green fluorescence, the green fluorescence in the above formula is directly generated by the wavelength conversion device 310. At this time, it is only necessary to calculate the first beam splitter according to the excitation efficiency curve of the green phosphor powder. 210 for the splitting ratio of the first blue laser light L1 and the second blue laser light L2 , and then set the first splitter 210 according to the splitting ratio.

The light source system 10 provided by the present invention converts part of the first light L into second light, and combines the second light with part of the first light L to correct the color coordinates of the first light L in the light source system to meet the DCI standard The required coordinate value of the primary color light is required, and the color gamut can be further improved to reduce the cost of the light source.

2 and 3, in a further embodiment, the first beam splitter 210 includes a first surface 211 and a second surface 212 oppositely arranged, the first surface 211 is arranged opposite to the first light source 100, and the first light After L is incident on the first region 213 of the first surface 211 , the first region 213 of the first surface 211 reflects part of the first light L to the wavelength converting device 310 and transmits part of the first light L to the first light combiner 410 . In this embodiment, the first optical splitter 210 performs time-sequential optical splitting by rotation. It can be understood that, in other embodiments, the first region 213 of the first surface 211 transmits part of the first light L to the wavelength conversion device 310 and reflects part of the first light L to the first light combiner 410 .

In a further embodiment, the first beam splitter 210 can rotate around an axis perpendicular to the first surface 211, the first beam splitter 210 also includes a second area 214 adjacent to the first area 213, the first area 213 and The second regions 214 are located on predetermined optical paths in time sequence respectively, and the second regions 214 of the first surface 211 are used to reflect the first light L to the wavelength conversion device 310 . Wherein, the second area 214 and the first area 213 are distributed in the circumferential direction, and there may be a plurality of them, and the distribution may be crossed. Preferably, the second region 214 and the first region 213 are circumferentially distributed on the first beam splitter 210 . When the first beam splitter 210 is in the rotation process, the first area 213 and the second area 214 receive the first light L generated by the first light source 100 in time division, and when the first light L is incident on the second area 214, the first The light L is fully reflected; when the first light L is incident on the first region 213, it is divided into a part of the first light L1 and a part of the first light L2, wherein part of the first light L1 reaches the wavelength conversion device 310 along one of the paths and is Converted to the second light, part of the first light L2 reaches the first light combiner 410 along another path, and the second light and part of the first light L2 are combined through the first light combiner 410 to correct the first light of the light source system L color coordinates to get the target light. It can be understood that the area ratio of the second region 214 and the first region 213 on the first surface 211 of the first beam splitter 210 is set according to actual needs.

In other embodiments, the light source system 10 further includes a second light source, the second light source is used to generate a third light, the third light is different from the first light L, and the third light can be incident on the first beam splitter 210 The second area 214 of the second surface 212 is completely reflected by the second area 214 of the second surface 212 and reaches the first light combiner 410 . And when the first light L incident on the second region 214 of the first surface 211 of the first beam splitter 210 is completely reflected to the wavelength conversion device 310, and after being converted into the second light by the wavelength conversion device 310, the second The light is combined with the third light through the first light combiner 410 .

The second light emitted by the wavelength conversion device will be described below. In the first embodiment of the wavelength conversion device, the wavelength conversion device only includes one wavelength conversion section, which can be specifically a yellow phosphor section or a green phosphor section of a full-color section. , at this time, the second light emitted by the wavelength conversion device is all yellow fluorescent light or green fluorescent light.

The second wavelength conversion device embodiment, the wavelength conversion device includes a plurality of wavelength conversion sections, specifically may include a first wavelength conversion section and a second wavelength conversion section, wherein the first wavelength conversion section is a yellow phosphor section , the second wavelength conversion section is a green phosphor section, at this time, the first area of the first beam splitter corresponds to the green phosphor section of the wavelength conversion device, that is, the central angles of the first area and the green phosphor section are equal; the second area Corresponding to the yellow phosphor section of the wavelength conversion device, that is, the central angles of the second region and the yellow phosphor section are equal; at this time, the first light emitted by the first light source is incident on the first splitter after passing through the first beam splitter for a time sequence. Part of the first light in the first region of the device is reflected into the wavelength conversion device, part of the first light is transmitted into the first light combiner, and the green phosphor segment of the wavelength conversion device is excited to generate green fluorescence, and the green fluorescence passes through the first light combiner and the first photosynthetic light to adjust the color coordinates of the first light. At this time, the second light emitted by the wavelength conversion device is green fluorescence. It can be understood that the fluorescent section of the wavelength conversion device needs to consider the actual first light to be adjusted. color, when the first light is blue light, the fluorescent segment of the wavelength conversion device used to adjust the color coordinates of the first light at this time is a yellow phosphor segment or a green phosphor segment; when the first light is red light, this When the fluorescent section of the wavelength conversion device used to adjust the color coordinates of the first light is a yellow phosphor section or a red phosphor section; when the first light is green light, the wavelength conversion used to adjust the color coordinates of the first light at this time The phosphor segment of the device is a yellow phosphor segment or a green phosphor segment. In the next time sequence, the first light incident on the second area of the first beam splitter is reflected and enters the wavelength conversion device, and the yellow phosphor section of the wavelength conversion device is excited to generate yellow fluorescence, which enters through the first light combiner. Opto-mechanical components, at this time, the second light emitted by the wavelength conversion device is yellow fluorescence, so the second light emitted by the wavelength conversion device in this embodiment is sequential green fluorescence and red fluorescence; it can be understood that the wavelength conversion device is In the case of multiple fluorescent sections, the second light emitted by the wavelength conversion device may be multicolor fluorescent light emitted sequentially.

In a further embodiment, the first region 213 of the first surface 211 is provided with an anti-reflection film 215 . The first light L is incident on the first region 213 of the first surface 211 at different incident angles of the anti-reflection coating 215, so that the ratio of the first light L being split by the anti-reflection coating 215 is different, specifically being reflected and transmitted by the anti-reflection coating 215 The ratio is different. Specifically, when the incident angle of the first light L incident on the anti-reflection film 215 is 45°, the percentage of the part of the first light L1 reflected by the anti-reflection film 215 is 3%, and the part of the first light L1 transmitted by the anti-reflection film 215 The percentage of L is 97%. At this time, the first light L is blue laser light, the first light L1 passes through the wavelength conversion device 310 to emit the second light, and the second light and the first light L2 pass through the first light combiner 410 to emit light. To correct the blue light color coordinates of the light source system.

In a further embodiment, the second surface 212 is a scattering surface, and the second surface 212 is provided with a scattering film 216, which can effectively reduce the speckle phenomenon during blue light display. When the light source system 10 is applied to a projection system, the speckle phenomenon is serious during blue light display. In this embodiment, the rotating first beam splitter 210 is used to make the second surface 212 continuously rotate to reduce the speckle phenomenon, and Setting the scattering film 216 on the second surface 212 further reduces the speckle phenomenon and improves the display effect.

Please refer to Fig. 1 again, in the present embodiment, described light source system 10 comprises light collection system 320, dichroic film 330, condenser lens 101, uniform light system 102, first reflection mirror 109, relay lens (103 , 104, 105, 106), collimating lens system 107 and compound eye 108. In this embodiment, the wavelength conversion device 310 is a fluorescent wheel, and the first light combiner 410 and the dichroic film 330 are dichroic films that reflect blue and turn yellow. The dodging system 102 may be one of a light rod dodging system, a compound eye dodging system and a diffuser. Wherein the condenser lens 101 is disposed between the first light source 100 and the first beam splitter 210 for collecting the first light L and then entering the first beam splitter 210 . In FIG. 1, the straight line represents the propagation path of the first light, and the dotted line represents the propagation path of the fluorescence. In this embodiment, the first light L is blue laser light, as described below.

The propagation path of the first blue laser light L1 after the splitting of the blue laser light L is the uniform light system 102, the first reflector 109, the relay lens 103, the dichroic film 330, the light collection system 320, the fluorescent wheel 310, and the first blue laser light L1. After the laser light L1 reaches the fluorescent wheel 310, the fluorescent wheel 310 is provided with fluorescent powder, such as yellow fluorescent powder, and the first blue laser light L1 excites the yellow fluorescent powder to generate yellow fluorescent light Y, that is, the first blue laser light L1 is converted into yellow fluorescent Y. , the yellow fluorescent light Y is incident on the dichroic film 330 through the light collection system 320 , passes through the dichroic film 330 , and then enters the first light combiner 410 through the relay lens 104 .

The propagation path of the second blue laser light L2 after the splitting of the blue laser light L is the relay lenses 105 and 106 and then reaches the first light combiner 410 .

The yellow fluorescent Y and the second blue laser light L2 reach the first optical combiner 410 and then mix to obtain mixed light. The mixed light is incident on the collimating lens system 107 and reaches the compound eye 108, and then the yellow fluorescent Y is divided into red fluorescent light and green fluorescent light. The fluorescent G, wherein the red fluorescent light enters a spatial light modulator for modulation, and the green fluorescent G and the second blue laser light L2 enters another spatial light modulator for modulation, so as to correct the color coordinates of blue light. Usually, in the light source system, blue light and green light are modulated by the same spatial light modulator, and red light is modulated by another spatial light modulator, so the influence of red fluorescence on the color coordinates can be excluded when blue light is displayed, and the color coordinates displayed by blue light are determined by the second Two blue laser L2 and green fluorescent G are determined.

In other embodiments, the fluorescent wheel 310 may be provided with green fluorescent powder. The fluorescent wheel 310 directly converts the first blue laser light L1 into green fluorescent G, and then combines the green fluorescent G with the second blue laser L1 to obtain the target blue light.

Referring to Fig. 4 and Fig. 5, the second embodiment of the present invention provides a light source system. The difference between the second embodiment and the first embodiment is that the structure of the first beam splitter 210 is different, specifically, the first splitter 210 The second area 214 of the first surface 211 of the device 210 is the same as the first embodiment, and the first area 213 of the first surface 211 is provided with a dichroic film 217 . The dichroic film 217 with different splitting ratios makes the ratios of the part of the first light L1 and the part of the first light L2 divided into different ratios after the first light L is incident on the dichroic film 217 .

In this embodiment, when the first light L is blue laser light, the ratio of the blue laser light L split by the light splitting film 217 can be set according to the actual situation, that is to say, the light splitting film 217 with different light splitting ratios can be set. . For example, when the yellow phosphors in the fluorescent wheel 310 are different, the excitation efficiency curve of the yellow phosphors converted by the first blue laser light L1 and the ratio of red fluorescence and green fluorescence in the fluorescence are different. The ratios of the yellow fluorescent light and the second blue laser light L2 are also different, so the ratio of splitting the blue laser light L in the first beam splitter 210 should be changed accordingly. In this embodiment, by disposing the light-splitting film 217 in the first region 213, various required light-splitting ratios can be obtained.

Please refer to FIG. 6 to FIG. 8 , the third embodiment of the present invention provides a light source system 10b. The difference between the third embodiment and the first embodiment is that no antireflection film is provided in the first region 213 of the first surface 211 , the first region 213 is a surface without coating. Wherein, the light source system 10 further includes a half-wave plate 220, the half-wave plate 220 is located between the first light source 100 and the first beam splitter 210, the first light L passes through the half-wave plate 220 and then enters the first surface of the first surface 211 An area 213 .

In this embodiment, the first light L is blue laser light. Since the first region 213 of the first surface 211 needs to split the blue laser light L, the transmittance and reflectivity of the first region 213 of the first surface 211 to the blue laser light L The spectroscopic requirement of the light source is relatively high, which is achieved by coating the anti-reflection coating in the first embodiment, but the process of coating the anti-reflection coating is relatively difficult, which increases the cost of the light source. Therefore, in this embodiment, the first surface of the first surface 211 No anti-reflection film is provided on the area 213, but a half-wave plate 220 is added between the first light source 100 and the first beam splitter 210, and the blue light is reflected by setting the crystal axis direction of the half-wave plate 220 and the polarization direction of the blue laser L. Spectroscopic work of laser L.

It can be understood that, assuming that the first region 213 of the first surface 211 is a glass surface, the reflectivity and transmittance of the uncoated first region 213 glass surface are related to the polarization state of the incident light. When the incident light is relative to the glass surface When fully polarized p light, the proportion of incident light passing through the glass surface is high, and the proportion reflected by the glass surface is low. When the incident light is s light relative to the glass surface, the proportion of incident light passing through the glass surface is low , and the proportion reflected by the glass surface is relatively high, and generally the incident light is incompletely polarized light relative to the glass surface, that is, it includes part of p-light and part of s-light at the same time, and the proportion of part of p-light and part of s-light incident on the glass surface It determines the proportion of incident light transmitted and reflected by the glass surface, and then can achieve light splitting. The proportion of part of p-light and part of s-light incident on the glass surface is related to the polarization state of the incident light. Therefore, in this embodiment, a half-wave plate 220 is set between the first light source 100 and the first beam splitter 210, and the incident light After passing through the half-wave plate 220, the polarization direction will be adjusted. For example, when there is an angle α between the laser polarization direction and the crystal axis direction of the half-wave plate 220, the laser polarization direction will rotate by 2α after passing through the half-wave plate 220, and the laser after the polarization direction changes enters the glass. The ratio of p-light and s-light at surface time changes accordingly. Therefore, by adjusting the angle between the polarization direction of the laser light and the crystal axis direction of the half-wave plate 220, the ratio of the p-light and s-light incident to the first region 213 is adjusted, thereby adjusting the splitting ratio of the incident blue laser light L.

In this embodiment, the blue laser light L emitted by the blue laser 100 is polarized light with a very high degree of polarization, and when the incident light is p light relative to the glass surface of the first region 213, the reflectivity is low, and the reflectivity is less than 3%; When the incident light is s-light relative to the glass surface of the first region 213, the reflectivity is relatively high, and the reflectivity is about 9%. At this time, the angle of the incident light incident on the first region 213 is about 45°, and the incident light can be adjusted by adding a half-wave plate 220 The polarization direction of the light incident on the first region 213 , and then adjust the ratio of the p-light and s-light incident on the first region 213 , to obtain an appropriate transmittance ratio after being split by the first beam splitter 210 .

It can be understood that, in this embodiment, when the incident direction of the first light L is constant, the real-time adjustment of the light splitting ratio can be realized by rotating and adjusting the half-wave plate 220 .

Please refer to FIG. 9 to FIG. 11 , the fourth embodiment of the present invention provides a light source system 10c. The difference between the fourth embodiment and the first embodiment is that the structure of the first beam splitter 210 is different from the first embodiment. In the The first area 213 of a surface 211 includes a first area 218 and a second area 219 adjacent to each other, the first area 218 is provided with a high reflection film 221, and the second area 219 is provided with an anti-reflection film 222; the first light L incident The light spot O to the first region 213 of the first surface 211 is divided into adjacent first light spot O1 and second light spot O2, wherein the first light spot O1 of the first light L is incident on the high reflection film 221 of the first region 218 and is After being reflected, it reaches the wavelength conversion device 310 , and the second light spot O2 of the first light L is incident on the anti-reflection film 222 of the second area 219 and passes through the second surface 212 from the anti-reflection film 222 to reach the first light combiner 410 .

In this embodiment, when the first light L is blue laser light, the ratio of the first light spot O1 and the second light spot O2 is actually the first blue laser light L1 incident on the high reflection film 221 and the first blue laser light L1 incident on the The proportion of the second blue laser light L2 transmitted by the transparent film 222 . In this embodiment, by setting the high reflection film 221 and the anti-reflection film 222 in the first area 213 of the first surface 211, and by setting the angle at which the blue laser L is incident on the first area 213, the first area 213 is adjusted. The splitting ratio of the first blue laser light L1 reflected by the high reflection coating 221 in the first region 213 and the second blue laser light L2 transmitted by the anti-reflection coating 223 in the first region 213 .

Referring to FIG. 10 , in a further embodiment, the first area 218 and the second area 219 are arranged in a fan shape in the first area 213 , and the second area 219 is arranged on the outer periphery of the first area 218 . Because only a small amount of fluorescent light G is needed to correct the second blue laser light L2 , the area of the first region 218 is smaller than that of the second region 219 . The area of the first light spot O1 incident on the first area 218 is smaller than the area of the second light spot O2 incident on the second area 219 .

Referring to FIG. 9 , in a further embodiment, a mirror 500 is further provided between the first light source 100 and the first beam splitter 210 , and the first light L enters the first beam splitter 210 after being reflected by the mirror 500 . In this embodiment, the blue laser light L is converged to the first beam splitter 210 through the condenser lens 101, and the angle of the incident condenser lens 101 affects the position of the blue laser light L spot O in the first region 213 of the first beam splitter 210. Adjusting the position of the reflector 500 can change the angle of the incident condenser lens 101 blue laser light L, therefore, the adjustment of the position of the light spot O on the first region 213 in the first beam splitter 210 can be realized by adjusting the position angle of the reflector 500, thereby changing The splitting ratio of the blue laser L realizes the adjustment of the blue light color coordinates. In this embodiment, the reflecting mirror 500 is used to adjust the ratio of the first light spot O1 and the second light spot O2 incident on the first area 213 , so that the adjustment operation of the light splitting ratio is more convenient.

Please refer to Fig. 12 and Fig. 13, the fifth embodiment of the present invention provides a light source system 10d, in which the light source system 10d also includes a filter 600, the wavelength conversion device 310 is a ring structure, and at least includes a wavelength conversion region , the optical filter 600 is a ring structure and includes at least one filtering region, the optical filter 600 is at least used for filtering the second light, and the optical filter 600 is coaxially arranged with the wavelength conversion device 310 . The wavelength conversion area is used for wavelength conversion of the incident light, and the filter area is used for filtering the incident light. The mixed light of the filtered second light and part of the first light L2 complies with DCI color coordinates. The second light G is properly filtered through the filter 600 to ensure that the color coordinates of part of the first light L2 combined with the second light G can reach the required color gamut standard.

In this embodiment, the light source system 10d includes a blue laser light source 501, a condenser lens 502, a first beam splitter 503, a uniform light system 504, a relay lens (505, 509, 511, 512a and 512b), a dichroic Sheet 506 and first light combiner 510 , light collection system 507 , wavelength conversion device 508 , second mirror 513 and square rod 514 . Wherein the dichroic film 506 and the first light combiner 510 are blue-transparent and yellow-transparent dichroic films, and the square rod 514 is a uniform light device. The wavelength conversion device 508 is a ring structure, and the surface of the wavelength conversion device 508 is provided with a fluorescent layer 311 . The fluorescent layer 311 includes an R conversion area, a B conversion area and a G conversion area, wherein the R conversion area is provided with orange phosphor or yellow phosphor, the G conversion area is provided with green phosphor, and the B conversion area is provided with green phosphor. The optical filter 600 is an annular structure, which is arranged coaxially with the wavelength conversion device 508, that is, it can rotate synchronously around the same axis, wherein the optical filter 600 is arranged inside the ring of the wavelength conversion section 508, and the optical filter 600 includes R filter area, B filter area and G filter area, and the center of R conversion area and R filter area is set at 180 degrees, the center of B conversion area and B filter area is set at 180 degrees, G conversion The centers of the G filter area and the G filter area are set at 180 degrees, and the filter 600 is mainly used to filter the incident light to calibrate the color coordinates of the outgoing light. The wavelength conversion wheel 508 and the first beam splitter 503 need to be synchronized, that is, when the blue laser light L is incident on the first area 211 of the first beam splitter 503, the first blue laser light L1 separated at this time is incident on the fluorescent layer in the wavelength conversion 508 311 B transition area. In FIG. 12 , the straight line represents the propagation path of the blue laser light, and the dotted line represents the propagation path of the fluorescence, as described below.

The blue laser light L emitted by the blue laser light source 501 is collected by the condenser lens 502 and then incident on the first beam splitter 503, and is divided into the first blue laser light L1 and the second blue laser light L2 by the first beam splitter 503, and the first blue laser light L1 is sequentially After passing through uniform light system 504, relay lens 505, dichroic film 506, light collection system 507, and wavelength conversion device 508, after the first blue laser light L1 reaches the wavelength conversion device 508, B in the fluorescent layer 311 of the wavelength conversion device 508 is excited. The green fluorescent powder in the conversion area generates green fluorescence, that is, in the B area of the fluorescent layer 311, the first blue laser light L1 is converted into green fluorescent G, and the green fluorescent G propagates to the dichroic sheet 506 through the light collection system 320, and is absorbed The dichroic film 506 is reflected to the relay lens 509, then incident to the first light combiner 510, reflected by the first light combiner 510 to the relay lens 511, and then incident to the optical filter 600 through the relay lens 511 , the green fluorescence G filtered by the filter 600 is incident into the square rod 514 .

The second blue laser light L2 passes through the relay lens 512 a , the second mirror 513 , the relay lens 512 b and the first light combiner 510 in sequence.

The green fluorescent light G and the second blue laser light L2 reach the first light combiner 510 and then mix to obtain mixed light. The mixed light is incident on the filter 600 in the fluorescent wheel 508 through the relay lens 511, and is filtered by the filter 600. The green fluorescent light G of is incident into the square rod 514 . At this time, the green fluorescence G is filtered by the filter 600 to modify the color, and the modified green fluorescence G is combined with the second blue laser L2 to obtain the target blue light. In this embodiment, the filter 600 is used to properly filter the green fluorescent light G in the B conversion area, so as to ensure that the color coordinates of the combined light of the second blue laser L2 and the green fluorescent light can reach the required color gamut standard.

It can be understood that the first optical splitter 503 in the above optical path may be any first optical splitter 210 in the first embodiment to the fourth embodiment.

The present invention also provides a projection system, which includes the light source system according to any one of the above embodiments. The projection system can adopt various projection technologies, such as liquid crystal display projection technology, digital light path processor projection technology, and the above-mentioned light source system can also be applied to lighting systems, such as stage lighting.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (8)

1. A light source system, the light source system comprising:

a first light source for emitting a first light;

wavelength conversion means for wavelength-converting the first light and obtaining second light;

a first beam splitter comprising a first region for guiding part of the first light to the wavelength conversion device and for guiding part of the first light to a first light combiner, and a second region for guiding the first light to the wavelength conversion device;

the first light combiner is used for guiding part of the first light emitted by the first area and part of the second light emitted by the wavelength conversion device to be emitted along the same light path;

the first light splitter comprises a first surface and a second surface which are arranged opposite to each other, the first surface is opposite to the first light source, after the first light is incident on a first area of the first surface, the first area of the first surface reflects part of the first light to the wavelength conversion device, and transmits part of the first light to the first light combiner; or a first region of the first surface transmitting part of the first light to the wavelength conversion device and reflecting part of the first light to the first light combiner;

a first region of the first surface comprises a first sub-region and a second sub-region which are adjacent to each other, the first sub-region and the second sub-region are arranged in a fan shape, the second sub-region is arranged at the periphery of the first sub-region, and the area of the first sub-region is smaller than that of the second sub-region; the first subarea is provided with a high reflection film, and the second subarea is provided with an antireflection film; the light spot of the first light incident on the first area of the first surface is divided into a first light spot and a second light spot which are adjacent, wherein the first light spot of the first light is incident on the high reflection film and reflected to reach the wavelength conversion device, and the second light spot of the first light is incident on the antireflection film and transmitted through the second surface from the antireflection film to reach the first light combiner.

2. The light source system of claim 1, wherein the first region of the first surface is provided with an anti-reflection film.

3. The light source system of claim 1, wherein the first beam splitter is rotatable about an axis perpendicular to the first surface, the first beam splitter further comprising a second region disposed adjacent to the first region, the first region and the second region each being sequentially positioned on a predetermined optical path, the second region of the first surface being configured to reflect the first light to the wavelength conversion device.

4. The light source system of claim 1, wherein a light splitting film is disposed on the first region of the first surface.

5. The light source system of claim 1, further comprising a half-wave plate positioned between the first light source and the first beam splitter, the first light passing through the half-wave plate before entering the first region of the first surface.

6. The light source system of claim 1, wherein a mirror is further disposed between the first light source and the first beam splitter, and the first light is reflected by the mirror and then enters the first beam splitter.

7. The light source system according to any one of claims 1-6, further comprising a filter, wherein the wavelength conversion device has a ring-like structure and comprises at least one wavelength conversion region;

the optical filter is of an annular structure and at least comprises a filtering area, the filtering area is at least used for filtering the second light, and the optical filter and the wavelength conversion device are coaxially arranged.

8. A projection system comprising a light source system as claimed in any one of claims 1-7.

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