WO2020216262A1

WO2020216262A1 - Light source system and projection system

Info

Publication number: WO2020216262A1
Application number: PCT/CN2020/086235
Authority: WO
Inventors: 郭祖强; 鲁宁; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2019-04-24
Filing date: 2020-04-23
Publication date: 2020-10-29
Also published as: CN111856858A; CN111856858B

Abstract

A light source system (10) and a projection system. The light source system (10) comprises a first light source (100) for emitting first light (L); a wavelength conversion device (310) for performing wavelength conversion on a part of the first light (L) to obtain second light; a first light splitter (210) comprising a first region (213) and a second region (214), wherein the first region (213) guides a part of first light (L1) to the wavelength conversion device (310) and guides a part of first light (L2) to a first light combiner (410), and the second region (214) guides the first light (L) to the wavelength conversion device (310); and the first light combiner (410) for guiding the part of the first light (L2) emitted from the first region (213) and a part of second light emitted from the wavelength conversion device (310) to emit along the same light path. The light source system (10) can correct the color coordinates of the first light (L), improve the color gamut range, and reduce the costs of the light source.

Description

Light source system and projection system

Technical field

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

Background technique

In the laser light source system, a blue laser is usually used as the blue primary color for display. Taking into account 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, the dominant wavelength of the laser generally has a tolerance of about ±5nm.

Cinema projectors that use laser light sources must meet the Digital Cinema Initiative (DCI) standard. When the dominant wavelength of the laser is less than 452nm, its color coordinate y value is less than 0.02, which may not meet the DCI blue color coordinate standard. Select the dominant wavelength of the blue laser. At the same time, although the blue laser color coordinate greater than 452nm meets the DCI standard, it is biased toward the lower limit of the blue color coordinate range, which leads to a larger proportion of red and green light when the ratio of blue light to red and green light is white. Reduced utilization rate or increased cost.

Summary of the invention

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

A light source system, the light source system includes:

The first light source is used to emit the first light;

A wavelength conversion device for performing wavelength conversion on part of the first light and obtaining second light;

The first beam splitter includes a first area and a second area, and the first area is used for guiding part of the first light to the wavelength conversion device, and for guiding part of the first light to the first combined light A device, the second area is used to guide the first light to the wavelength conversion device;

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

In an embodiment, the first beam splitter includes a first surface and a second surface disposed opposite to each other, the first surface is disposed opposite to the first light source, and the first light is incident on the first light source. After the first area of the 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

The first area 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, the first area of the first surface is provided with an anti-reflection film.

In an embodiment, the first beam splitter is rotatable about an axis perpendicular to the first surface, and the first beam splitter further includes a second area arranged adjacent to the first area. The second area and the second area are respectively located on a predetermined light 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 spectroscopic film is provided on the first area 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, and the first light passes through the half-wave plate. Incident on the first area of the first surface.

In one embodiment, the first area of the first surface includes a first sub-area and a second sub-area that are adjacent to each other, and a high-reflection film is provided on the first sub-area, and the second sub-area is provided with Anti-reflection coating; the first light is incident on the first area of the first surface spot is divided into adjacent first and second spots, wherein the first 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 spot of the first light is incident on the antireflection coating and reaches the first composite after the antireflection coating passes through the second surface. Optical device.

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

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

The filter is a ring structure and includes at least one filter area, the filter area is used to filter the second light at least, 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.

The 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 primary color light coordinate value is required, and the color gamut range can be further increased, and the cost of the light source can be reduced.

Description of the drawings

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

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.

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 optical splitter according to a third embodiment of the present invention.

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

FIG. 12 is a schematic structural diagram of a light source system provided by a 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 are the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered This is the protection scope of the present invention.

Referring to FIGS. 1 to 3, a 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 which is used for guiding Part of the first light L1 to the wavelength conversion device 310, and used to guide part of the first light L2 to the first light combiner 410, the first light combiner 410 is used to guide part of the first light L2 and wavelength emitted from the first region 213 The second light emitted by the conversion device 310 is emitted along the same optical path, wherein the percentage range of the first light used for guiding to the wavelength conversion device 310 is γ, 0<γ<10%, that is, when the first light L1 is incident on the first area 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 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 photosynthetic light to adjust the color coordinates of the emitted first light.

The wavelength of the second light is different from that of the first light L, and 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 obtains the desired target light.

In this embodiment, the first light L can be any kind of light, preferably a blue laser, and the second light can be any kind of fluorescence different from the first light L, preferably green fluorescence or yellow fluorescence. That is, when the first light L is a blue laser and the second light is a green fluorescence, the green fluorescence and the blue laser are combined to make the green fluorescence 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, when the second light is yellow fluorescence, the yellow fluorescence can be divided into green fluorescence and red fluorescence through the spectroscopic element, and the separated green fluorescence and blue laser are modulated and displayed by the same spatial light modulator. The combination of laser and green fluorescence can also calibrate the blue 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 relatively large amount, and the second light G is used as For the calibration light, the luminous flux in the combined light channel of this primary color light accounts for a relatively small amount. 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 blue laser light L, the first beam splitter 210 is used to receive blue laser light L, and the first beam splitter 210 includes at least a first Area 213 and second area 214, where the first area 213 receives the blue laser light L and divides the blue laser light L into a first blue laser light L1 and a second blue laser light L2 that travel along different paths; the wavelength conversion device 310 receives the first blue laser light L1 , And convert the first blue laser L1 into yellow fluorescent Y. In this embodiment, the first blue laser L1 can excite the yellow fluorescent powder to generate yellow fluorescent 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 fluorescence G, wherein the wavelength conversion device 310 includes at least a wavelength conversion area corresponding to the central angle of the first area 213 of the first beam splitter 210 ; The first light combiner 410 mixes the fluorescence emitted by the wavelength conversion device 310 and the second blue laser L2 to correct the blue color coordinate of the light source system.

The following describes the calibration process of the blue laser color coordinates. 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 ), The color coordinates of a blue laser L1 excited 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 generate yellow fluorescence and split light, the target blue color coordinate Is (x,y). The ratio of the second blue laser L2 and the green fluorescence (lumens) required to reach the target blue color coordinate is

Then, according to the excitation efficiency curve of the yellow phosphor and the ratio of red fluorescence and green fluorescence in the fluorescence, the light splitting ratio of the first blue laser L1 and the second blue laser L2 by the first beam splitter 210 is calculated, and then the first light splitting is matched and set according to the light splitting ratio器210.

It should be noted that when the wavelength conversion section of the wavelength conversion device 310 includes green fluorescence, the green fluorescence of the above formula is directly generated by the wavelength conversion device 310. At this time, it is only necessary to calculate the first spectrometer based on the excitation efficiency curve of the green phosphor. 210 the light splitting ratio of the first blue laser L1 and the second blue laser L2, and then the first light splitter 210 is matched and set according to the light 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 primary color light coordinate value requirements can further increase the color gamut range and 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 disposed opposite to each other, the first surface 211 is disposed opposite to the first light source 100, and the first light After L is incident on the first area 213 of the first surface 211, the first area 213 of the first surface 211 reflects part of the first light L to the wavelength conversion device 310 and transmits part of the first light L to the first light combiner 410. In this embodiment, the first beam splitter 210 performs sequential beam splitting through 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, and the first beam splitter 210 further includes a second region 214 disposed adjacent to the first region 213, the first region 213 and the The second areas 214 are respectively located on the predetermined light path in time sequence, and the second areas 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 a circumferential direction, and the two may be multiple, and may be distributed across. Preferably, the second area 214 and the first area 213 are circumferentially distributed on the first beam splitter 210. When the first beam splitter 210 is rotating, the first area 213 and the second area 214 receive the first light L generated by the first light source 100 in a time-division manner. When the first light L is incident on the second area 214, the first light L The light L is completely reflected; when the first light L is incident on the first area 213, it is divided into a part of the first light L1 and a part of the first light L2, and part of the first light L1 reaches the wavelength conversion device 310 along one of the paths and is Converted into 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 coordinate, get the target light. It can be understood that the area ratio of the second area 214 to the first area 213 in 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 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. When the first light L incident on the second area 214 of the first surface 211 of the first beam splitter 210 is completely reflected to the wavelength conversion device 310 and converted into the second light by the wavelength conversion device 310, the second light The light and the third light are combined by 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 may be a full-color yellow phosphor section or a green phosphor section. At this time, the second light emitted by the wavelength conversion device is all yellow fluorescence or green fluorescence.

In the second embodiment of the wavelength conversion device, the wavelength conversion device includes a plurality of wavelength conversion sections, which may specifically 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 region of the first beam splitter corresponds to the green phosphor section of the wavelength conversion device, that is, the central angles of the first region and the green phosphor section are equal; Corresponding to the yellow phosphor section of the wavelength conversion device, that is, the second area and the yellow phosphor section have the same central angle; at this time, the first light emitted by the first light source passes through the first beam splitter for a time sequence and is incident on the first beam splitter Part of the first light in the first area of the device is reflected into the wavelength conversion device, and part of the first light is transmitted into the first light combiner to excite the green phosphor section of the wavelength conversion device to generate green fluorescence, and the green fluorescence passes through the first light combiner The light is combined with the first photos 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 is understandable that the fluorescence section of the wavelength conversion device needs to consider the actual first light to be adjusted. When the first light is blue, the fluorescent section of the wavelength conversion device used to adjust the first light color coordinate is a yellow phosphor section or a green phosphor section; when the first light is red light, this When the fluorescent section of the wavelength conversion device used to adjust the first light color coordinate is a yellow phosphor section or a red phosphor section; when the first light is green light, the wavelength conversion used to adjust the first light color coordinate at this time The fluorescent section of the device is a yellow phosphor section or a green phosphor section. In the next time sequence, the first light incident on the second region of the first beam splitter is reflected into the wavelength conversion device, and the yellow phosphor section of the wavelength conversion device is excited to produce yellow fluorescence, and the yellow fluorescence enters through the first light combiner. Opto-mechanical components. At this time, the second light emitted by the wavelength conversion device is yellow fluorescence. Therefore, the second light emitted by the wavelength conversion device of this embodiment is time-series green fluorescence and red fluorescence; it can be understood that the wavelength conversion device is In the multi-fluorescence section, the second light emitted by the wavelength conversion device may be multi-color fluorescence emitted sequentially.

In a further embodiment, the first area 213 of the first surface 211 is provided with an anti-reflection film 215. The first light L is incident on the first surface 211 of the first area 213 of the anti-reflection film 215 at different incident angles, so that the first light L is split by the anti-reflection film 215 in a different proportion, specifically reflected and transmitted by the anti-reflection film 215 The ratio is different. Specifically, when the incident angle of the first light L entering the antireflection film 215 is 45°, the percentage of the part of the first light L1 reflected by the antireflection film 215 is 3%, and the part of the first light transmitted by the antireflection film 215 The percentage of L is 97%. At this time, the first light L is a blue laser, the first light L1 emits the second light through the wavelength conversion device 310, and the second light and the first light L2 are combined and emitted through the first light combiner 410. To correct the blue color coordinate 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 during blue light display is more serious. 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 Disposing 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 this embodiment, the light source system 10 includes a light collection system 320, a dichroic plate 330, a condenser lens 101, a homogenization system 102, a first reflector 109, and a 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 blue and yellow dichroic films. The homogenization system 102 may be one of an optical rod homogenization system, a compound eye homogenization system, and a diffuser. The condenser lens 101 is arranged between the first light source 100 and the first beam splitter 210, and is used for collecting the first light L before 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 a blue laser, which is specifically described as follows.

After the blue laser light L is split, the propagation path of the first blue laser light L1 is the homogenization system 102, the first reflector 109, the relay lens 103, the dichroic plate 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. The first blue laser light L1 excites the yellow fluorescent powder to produce yellow fluorescent light Y, that is, the first blue laser light L1 is converted into yellow fluorescent light Y , The yellow fluorescent light Y is incident on the dichroic plate 330 through the light collection system 320, passes through the dichroic plate 330, and is incident on the first light combiner 410 through the relay lens 104.

After the blue laser light L is split, the propagation path of the second blue laser light L2 is

relay lenses

105 and 106 in sequence, and then reaches the first light combiner 410.

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

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

4 and 5, the second embodiment of the present invention provides a light source system. The second embodiment is different from the first embodiment in that the structure of the first beam splitter 210 is different. Specifically, the first beam splitter The second area 214 of the first surface 211 of the detector 210 is the same as in 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 light splitting ratios makes the proportions of the part of the first light L1 and the part of the first light L2 divided into different proportions after the first light L is incident on the dichroic film 217.

In this embodiment, when the first light L is a blue laser, the ratio of the light splitting film 217 to the blue laser light L can be set according to the actual situation, that is, light splitting films 217 with different light splitting ratios can be provided. . For example, when the yellow phosphor in the phosphor wheel 310 is different, the excitation efficiency curve of the yellow phosphor converted by the first blue laser L1 is different from the ratio of red fluorescence and green fluorescence in the fluorescence. At this time, it is necessary to obtain the target blue light. The ratio of the yellow fluorescent light and the second blue laser L2 are also different, so the ratio of the blue laser L to be split 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.

Referring to FIGS. 6 to 8, a third embodiment of the present invention provides a light source system 10b. The third embodiment is different from the first embodiment in that there is no anti-reflection coating 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 is incident on the first surface 211. One area 213.

In this embodiment, the first light L is a blue laser. Since the first area 213 of the first surface 211 needs to split the blue laser L, the transmittance and reflectance of the first area 213 of the first surface 211 to the blue laser L In the first embodiment, the requirements for light splitting are relatively high. In the first embodiment, it is realized by plating the antireflection film, but the process of plating the antireflection film is more difficult, which increases the cost of the light source. Therefore, in this embodiment, the first surface of the first surface 211 There is no anti-reflection coating on the area 213, but a half-wave plate 220 is added between the first light source 100 and the first beam splitter 210. The half-wave plate 220 is arranged in the crystal axis direction and the polarization direction of the blue laser L to achieve the blue laser The light splitting of the laser L works.

It is understandable that assuming that the first area 213 of the first surface 211 is a glass surface, the reflectance and transmittance of the glass surface of the uncoated first area 213 are related to the polarization state of the incident light. When the incident light is opposite to the glass surface In the case of fully polarized p-light, the proportion of incident light passing through the glass surface is higher, and the proportion of being reflected by the glass surface is lower. When the incident light is s-ray to the glass surface, the proportion of incident light passing through the glass surface is lower. , And the proportion of reflected by the glass surface is relatively high. 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, and the proportion of part of p light and part of s light incident on the glass surface Determines the ratio 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 provided 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 the laser polarization direction is at an angle α with the crystal axis direction of the half-wave plate 220, the laser polarization direction will be rotated by 2α after passing through the half-wave plate 220, and the laser with the changed polarization direction will enter the glass The ratio of p light and s light on the surface 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 the s light incident on the first region 213 is adjusted, and the light splitting ratio of the incident blue laser light L is adjusted.

In this embodiment, the blue laser light L emitted by the blue laser 100 is polarized light with a very high degree of polarization. When the incident light is p light relative to the glass surface of the first region 213, the reflectance is low, and the reflectance is less than 3%; When the incident light is s-ray with respect to the glass surface of the first region 213, the reflectance is higher, and the reflectivity is about 9%. At this time, the incident light enters the first region 213 at an angle of about 45°. The incidence can be adjusted by adding a half-wave plate 220. The polarization direction of the light incident on the first region 213 is adjusted, and the ratio of the p light and the s light incident on the first region 213 is adjusted to obtain an appropriate transmittance and inverse 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, by rotating and adjusting the half-wave plate 220, real-time adjustment of the light splitting ratio can be achieved.

Referring to FIGS. 9 to 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 that of the first embodiment. 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 antireflection film 222; the first light L is incident The light spot O reaching the first area 213 of the first surface 211 is divided into an adjacent first light spot O1 and a second light spot O2. The first light spot O1 of the first light L is incident on the high reflective film 221 of the first area 218. After reflection, it reaches the wavelength conversion device 310, and the second 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 the first light combiner 410.

In this embodiment, when the first light L is a blue laser, the ratio of the first light spot O1 to the second light spot O2 is actually that the blue laser light L is incident on the high-reflection film 221 and reflected by the first blue laser light L1 and incident on the increaser. The ratio 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 antireflection film 222 in the first area 213 of the first surface 211, and setting the angle at which the blue laser L enters the first area 213, the first area 213 is adjusted. The split ratio of the first blue laser light L1 reflected by the high reflective film 221 and the second blue laser light L2 transmitted by the antireflection film 223 in the first region 213.

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

Referring to FIG. 9, in a further embodiment, a reflector 500 is further provided between the first light source 100 and the first beam splitter 210, and the first light L is reflected by the reflector 500 and enters the first beam splitter 210. In this embodiment, the blue laser light L is condensed to the first beam splitter 210 through the condenser lens 101, and the incident angle of the condenser lens 101 affects the position of the spot O of the blue laser light L in the first region 213 of the first beam splitter 210. Adjusting the position of the reflector 500 can change the angle of the blue laser light L incident on the condenser lens 101. Therefore, the position of the spot O on the first region 213 in the first beam splitter 210 can be adjusted by adjusting the position and angle of the reflector 500, thereby changing The light splitting ratio of the blue laser L can adjust the blue color coordinate. In this embodiment, the reflector 500 is used to adjust the proportions 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.

12 and 13, a fifth embodiment of the present invention provides a light source system 10d, the light source system 10d further includes a filter 600, the wavelength conversion device 310 is a ring structure, and at least includes a wavelength conversion area The filter 600 is a ring structure and includes at least one filter area. The filter 600 is used to filter the second light at least. The filter 600 is coaxially arranged with the wavelength conversion device 310. The wavelength conversion area is used for wavelength conversion of incident light, and the filter area is used for filtering incident light. The mixed light of the filtered second light and part of the first light L2 conforms to the DCI color coordinate. The second light G is appropriately filtered by the filter 600 to ensure that the color coordinates of part of the first light L2 and the second light G after being combined 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 homogenizing system 504, a relay lens (505, 509, 511, 512a and 512b), dichroic Sheet 506 and first light combiner 510, light collection system 507, wavelength conversion device 508, second mirror 513 and square rod 514. Among them, the dichroic film 506 and the first light combiner 510 are dichroic films of transparent blue and yellow, and the square rod 514 is a light homogenizing device. The wavelength conversion device 508 has a ring structure, and the surface of the wavelength conversion device 508 is provided with a fluorescent layer 311. The phosphor layer 311 respectively includes an R conversion area, a B conversion area and a G conversion area, wherein the surface of the R conversion area is provided with orange phosphor or yellow phosphor, the surface of the G conversion area is provided with green phosphor, and the surface of the B conversion area is provided with green phosphor. The filter 600 is a ring structure, which is arranged coaxially with the wavelength conversion device 508 and can rotate synchronously around the same axis. The filter 600 is arranged inside the ring of the wavelength conversion section 508. The filter 600 includes R filter area, B filter area and G filter area, and the center of R conversion area and R filter area are set at 180 degrees, the center of B conversion area and B filter area are set at 180 degrees, G conversion The center of the 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 emitted 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's B conversion area. In FIG. 12, the straight line represents the propagation path of blue laser light, and the dotted line represents the propagation path of 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 to the first beam splitter 503, and is divided into the first blue laser beam L1 and the second blue laser beam L2 by the first beam splitter 503. The first blue laser beam L1 is sequentially After the homogenization system 504, the relay lens 505, the dichroic plate 506, the light collection system 507, and the 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 phosphor in the conversion area generates green fluorescence, that is, the first blue laser L1 is converted into green fluorescence G in the B area of the phosphor layer 311, and the green fluorescence G is transmitted to the dichroic plate 506 through the light collection system 320 and is The dichroic plate 506 is reflected to the relay lens 509, and then incident to the first light combiner 510, and then reflected by the first light combiner 510 to the relay lens 511, and then enters the filter 600 through the relay lens 511 , The green fluorescent light G filtered by the filter 600 is incident on the square rod 514.

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

The green fluorescence G and the second blue laser L2 reach the first light combiner 510 and are mixed 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 is incident on the square rod 514. At this time, the green fluorescent light G is filtered by the filter 600 for color correction, and the color-modified green fluorescent light G is combined with the second blue laser L2 to obtain the target blue light. In this embodiment, the green fluorescence G in the B conversion area is appropriately filtered by the filter 600 to ensure that the color coordinates of the second blue laser L2 combined with the green fluorescence can reach the required color gamut standard.

It can be understood that the first optical splitter 503 in the above-mentioned optical path may be any one of the 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 embodiments of the present invention, and the descriptions are relatively specific and detailed, but they should not be interpreted as limiting the scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

A light source system, characterized in that the light source system includes:

The first light source is used to emit the first light;

A wavelength conversion device for performing wavelength conversion on the first light and obtaining second light;

The first beam splitter includes a first area and a second area, and the first area is used for guiding part of the first light to the wavelength conversion device, and for guiding part of the first light to the first combined light A device, the second area is used to guide the first light to the wavelength conversion device;

The first light combiner is used to guide part of the first light emitted from the first region and part of the second light emitted from the wavelength conversion device to exit along the same optical path.
The light source system according to claim 1, wherein the first beam splitter comprises a first surface and a second surface disposed opposite to each other, the first surface is disposed opposite to the first light source, and the first surface After a light is incident on the 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 area. A light combiner; or

The first area 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.
3. The light source system of claim 2, wherein the first area of the first surface is provided with an anti-reflection coating.
The light source system according to claim 2, wherein the first beam splitter is rotatable about an axis perpendicular to the first surface, and the first beam splitter further includes a first beam splitter disposed adjacent to the first area. Two areas, the first area and the second area are respectively located on a predetermined optical path in time series, and the second area of the first surface is used to reflect the first light to the wavelength conversion device.
3. The light source system according to claim 2, wherein a dichroic film is provided on the first area of the first surface.
The light source system according to claim 2, wherein the light source system further comprises a half-wave plate, the half-wave plate is located between the first light source and the first beam splitter, and the first light After passing through the half-wave plate, it is incident on the first area of the first surface.
The light source system according to claim 2, wherein the first area of the first surface includes a first sub-area and a second sub-area that are adjacent to each other, and a high-reflection film is provided on the first sub-area, so An anti-reflection coating is provided on the second sub-region; the light spot of the first area where the first light is incident on the first surface is divided into a first light spot and a second light spot that are adjacent to each other, wherein the first light spot A light spot incident on the high-reflection film is reflected and then reaches the wavelength conversion device. The second light spot of the first light is incident on the anti-reflection film and passes through the second light-reflection film. The surface reaches the first light combiner.
The light source system of claim 7, wherein a reflector is further provided between the first light source and the first beam splitter, and the first light is reflected by the reflector and enters the The first beam splitter.
8. The light source system according to any one of claims 1-8, wherein the light source system further comprises a filter, and the wavelength conversion device is a ring structure and includes at least one wavelength conversion area;

The filter is a ring structure and includes at least one filter area, the filter area is used to filter the second light at least, and the filter is coaxially arranged with the wavelength conversion device .
A projection system, wherein the projection system comprises the light source system according to any one of claims 1-9.