CN111856858A

CN111856858A - Light source system and projection system

Info

Publication number: CN111856858A
Application number: CN201910333789.5A
Authority: CN
Inventors: 郭祖强; 鲁宁; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2019-04-24
Filing date: 2019-04-24
Publication date: 2020-10-30
Anticipated expiration: 2039-04-24
Also published as: CN111856858B; WO2020216262A1

Abstract

The invention provides a light source system, which comprises a first light source, a second light source and a control unit, wherein the first light source is used for emitting first light; the wavelength conversion device is used for carrying out wavelength conversion on part of the first light and obtaining second light; the first light splitter comprises a first area and a second area, the first area is used for guiding part of the first light to the wavelength conversion device and guiding part of the first light to the first light combiner, the second area is used for guiding the first light to the wavelength conversion device, and the first light combiner is used for guiding part of the first light emitted from the first area and part of the second light emitted from the wavelength conversion device to emit along the same light path. The invention also provides a projection system. The light source system provided by the invention converts part of the first light into the second light, combines the second light with part of the first light to correct the color coordinate of the first light so as to meet the requirement of the coordinate value of the primary color light required by the DCI standard, further improves the color gamut range and reduces the cost of the light source.

Description

Light source system and projection system

Technical Field

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

Background

In a laser light source system, a blue laser is generally used as a primary color of blue to perform display. The main wavelength of the blue laser commonly used in laser light sources is 455nm in consideration of the problems of the electro-optic conversion efficiency of the laser, the service life of the optical device, and the like. Due to the limitations of the fabrication process, the dominant wavelength of a laser typically has a tolerance of about ± 5 nm.

A cinema projector using a laser light source needs to meet a Digital Cinema Initiative (DCI) standard, when the dominant wavelength of a laser is less than 452nm, the color coordinate y value of the laser is less than 0.02, which may cause a problem that the blue color coordinate standard of the DCI is not met, and the dominant wavelength of the blue laser needs to be selected. Meanwhile, although the blue laser color coordinate larger than 452nm meets the DCI standard, the blue laser color coordinate is biased to the lower limit of the blue color coordinate range, so that the ratio of red light to green light is more when the blue light is matched with the red light and the green light into white light, the utilization rate of the blue laser is reduced or the cost is improved.

Disclosure of Invention

In view of the above, 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 for emitting a first light;

the wavelength conversion device is used for carrying out wavelength conversion on part of the first light to obtain second light;

A first optical splitter including a first region and a second region, the first region being configured to direct a portion of the first light to the wavelength conversion device and to direct a portion of the first light to a first optical combiner, the second region being configured to direct the first light to the wavelength conversion device;

the first light combiner is configured to guide a portion of the first light emitted from the first region and a portion of the second light emitted from the wavelength conversion device to emit along a same light path.

In an embodiment, the first optical splitter includes a first surface and a second surface opposite to each other, the first surface is disposed opposite to the first light source, and after the first light is incident on a first region of the first 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 optical combiner; or

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

In one embodiment, an antireflection film is disposed on the first region of the first surface.

In an embodiment, the first optical splitter is rotatable around an axis perpendicular to the first surface, the first optical splitter further includes a second area disposed adjacent to the first area, the first area and the second area are respectively and sequentially located on a preset optical path, and the second area of the first surface is configured to reflect the first light to the wavelength conversion device.

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

In an embodiment, the light source system further includes a half-wave plate located between the first light source and the first beam splitter, and the first light enters the first region of the first surface after passing through the half-wave plate.

In one embodiment, the first region of the first surface includes a first sub-region and a second sub-region which are adjacent to each other, the first sub-region is provided with a high-reflection film, and the second sub-region 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 reaches the wavelength conversion device after being reflected, and the second light spot of the first light is incident on the antireflection film and reaches the first light combiner after penetrating through the second surface from the antireflection film.

In an embodiment, a reflector is further disposed between the first light source and the first light splitter, and the first light is reflected by the reflector and then enters the first light splitter.

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

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

The invention also provides a projection system comprising the light source system.

The invention has the beneficial effects that: the light source system provided by the invention converts part of the first light into the second light, combines the second light with part of the first light to correct the color coordinate of the first light so as to meet the requirement of the coordinate value of the primary color light required by the DCI standard, further improves the color gamut range and reduces the cost of the light source.

Drawings

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

Fig. 2 is a schematic front structural diagram of a first optical splitter according to a first embodiment of the present invention.

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

Fig. 4 is a schematic front structural diagram of a first optical splitter according to a second embodiment of the present invention.

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

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

Fig. 7 is a schematic front structural diagram of a first optical splitter according to a 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 according to a fourth embodiment of the present invention.

Fig. 10 is a schematic front structural diagram of a first optical splitter according to a 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 according to a fifth embodiment of the present invention.

Fig. 13 is a schematic front view of a fluorescent wheel according to a fifth embodiment of the present invention.

Detailed Description

While the following is a description of the preferred embodiments of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Referring to fig. 1 to fig. 3, a light source system 10 according to a first embodiment of the present invention includes a first light source 100, a first optical splitter 210, a wavelength conversion device 310, and a first optical combiner 410. The first light source 100 is configured to emit first light L, the wavelength conversion device 310 is configured to perform wavelength conversion on a portion of the first light L and obtain second light, the first optical splitter 210 includes a first region 213, the first region 213 is configured to guide a portion of the first light L1 to the wavelength conversion device 310, and is configured to guide a portion of the first light L2 to the first optical combiner 410, the first optical combiner 410 is configured to guide a portion of the first light L2 emitted from the first region 213 and the second light emitted from the wavelength conversion device 310 to exit along a same optical path, where a percentage of the first light used for guiding to the wavelength conversion device 310 is γ, and 0< γ < 10%, that is, when the first light L1 is incident to the first region 213, a small amount of the 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, and it can be understood that the second light emitted from 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 be combined so as to adjust the color coordinate of the emergent first light.

The wavelength of the second light is different from that of 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 the wavelength different from that of the first light L is added in the first light L to correct the color coordinate value of the first light L, so that the required target light is obtained.

In this embodiment, the first light L may be any kind of light, preferably blue laser, and the second light may 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 blue laser and the second light is green fluorescence, the green fluorescence and the blue laser are combined to make the green fluorescence correct the color coordinate of the blue light, so as to obtain the desired blue light; when the first light L is blue laser and the second light is yellow fluorescence, the yellow fluorescence can be divided into green fluorescence and red fluorescence through the light splitting element, the divided green fluorescence and the divided blue laser are modulated and displayed through the same spatial light modulator, and the combined light of the blue laser and the green fluorescence can calibrate the blue light color coordinate of the light source system; the first light L is a primary light, and the light flux in the combined light path of the primary light is relatively large, and the second light G is a calibration light, and the light flux in the combined light path of the primary light is relatively small. In this embodiment, the first light source 100 is a blue laser light source 100, the blue laser light source 100 is configured to generate blue laser light L, the first beam splitter 210 is configured to receive the blue laser light L, and the first beam splitter 210 at least includes a first region 213 and a second region 214, where the first region 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 propagate along different paths; the wavelength conversion device 310 receives the first blue laser light L1 and converts the first blue laser light L1 into yellow fluorescent light Y, which can be generated by exciting a yellow fluorescent powder by the first blue laser light L1 in this embodiment, in other embodiments, the wavelength conversion device 310 includes a green fluorescent powder, and the wavelength conversion device 310 is configured 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 a central angle of the first region 213 of the first beam splitter 210; the first light combiner 410 combines the fluorescence emitted from the wavelength conversion device 310 with the second blue laser light L2 to correct the blue color coordinates of the light source system.

The following describes a calibration process of the blue laser color coordinate, taking the example that the wavelength conversion section of the wavelength conversion device 310 includes yellow phosphor, as follows: let the color coordinate of the second blue laser L2 be (x)_B，y_B) First, aThe color coordinate of the blue laser L1 for exciting the phosphor to convert into green fluorescence is (x)_G,y_G) The green fluorescence at this time is obtained by exciting the yellow phosphor with the first blue laser L1 to generate yellow fluorescence and splitting the yellow fluorescence, and the target blue color coordinate is (x, y). The ratio of the second blue laser light L2 and the green fluorescence (lumen count) required to reach the target blue color coordinate is

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

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 for the wavelength conversion device 310, and then the light splitting ratio of the first light splitter 210 to the first blue laser light L1 and the second blue laser light L2 is calculated according to the green phosphor excitation efficiency curve, and then the first light splitter 210 is configured according to the light splitting ratio.

The light source system 10 provided by the invention converts part of the first light L into the 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, so as to meet the requirement of the coordinate value of the primary color light required by the DCI standard, further improve the color gamut range, and reduce the light source cost.

Referring to fig. 2 and 3, in a further embodiment, the first light 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, after the first light L is incident on the first region 213 of the first surface 211, the first region 213 of the first surface 211 reflects a portion of the first light L to the wavelength conversion device 310, and transmits a portion of the first light L to the first light combiner 410. In the present embodiment, the first beam splitter 210 performs time-series beam splitting by rotation. It is understood that in other embodiments, the first region 213 of the first surface 211 transmits a portion of the first light L to the wavelength conversion device 310 and reflects a portion of the first light L to the first light combiner 410.

In a further embodiment, the first beam splitter 210 is rotatable around an axis perpendicular to the first surface 211, the first beam splitter 210 further includes a second area 214 disposed adjacent to the first area 213, the first area 213 and the second area 214 are respectively located in a predetermined optical path in time sequence, and the second area 214 of the first surface 211 is used for reflecting the first light L to the wavelength conversion device 310. The second region 214 and the first region 213 are distributed in the circumferential direction, and may be multiple and may be distributed in a cross manner. Preferably, the second region 214 and the first region 213 are circumferentially distributed on the first beam splitter 210. The first region 213 and the second region 214 receive the first light L generated by the first light source 100 in time division when the first beam splitter 210 is in rotation, and the first light L is totally reflected when the first light L is incident on the second region 214; when the first light L is incident on the first region 213, the first light L is divided into a part of the first light L1 and a part of the first light L2, wherein the part of the first light L1 reaches the wavelength conversion device 310 along one path and is converted into the second light, the part of the first light L2 reaches the first light combiner 410 along the other path, and the second light and the part of the first light L2 are combined by the first light combiner 410 to correct the color coordinates of the first light L of the light source system, so as to obtain the target light. It is understood that the area ratio of the second region 214 and the first region 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 for generating a third light, which is different from the first light L, and the third light can be incident on the second region 214 of the second surface 212 of the first beam splitter 210, totally reflected by the second region 214 of the second surface 212, and reach the first beam combiner 410. When the first light L incident to the second region 214 of the first surface 211 of the first optical splitter 210 is totally reflected to the wavelength conversion device 310 and is converted into the second light by the wavelength conversion device 310, the second light and the third light are combined by the first light combiner 410.

In the following description of the second light emitted from the wavelength conversion device, in the first embodiment of the wavelength conversion device, the wavelength conversion device includes only one wavelength conversion section, which may be a yellow phosphor section or a green phosphor section of a full-color section, where the second light emitted from the wavelength conversion device is all yellow phosphor or green phosphor.

In a 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, where the first wavelength conversion section is a yellow phosphor section, the second wavelength conversion section is a green phosphor section, and 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 corresponds to the yellow fluorescent powder section of the wavelength conversion device, namely the central angles of the second area and the yellow fluorescent powder section are equal; when the first light emitted by the first light source passes through a time sequence section of the first optical splitter, part of the first light incident on the first area of the first optical splitter is reflected to enter the wavelength conversion device, and part of the first light is transmitted to enter the first optical combiner, so that the green phosphor section of the wavelength conversion device is excited to generate green phosphor, the green phosphor is combined with the first light through the first optical combiner to adjust the color coordinate of the first light, and the second light emitted by the wavelength conversion device is green phosphor, which can be understood that the color of the first light to be actually adjusted needs to be considered in the phosphor section of the wavelength conversion device; when the first light is red light, the fluorescent section of the wavelength conversion device for adjusting the color coordinate of the first light is a yellow fluorescent powder section or a red fluorescent powder section; when the first light is green light, the fluorescent section of the wavelength conversion device for adjusting the color coordinate of the first light is a yellow fluorescent powder section or a green fluorescent powder section. In the next time sequence section, the first light incident on the second area of the first optical splitter is reflected to enter the wavelength conversion device, the yellow phosphor section of the wavelength conversion device is excited to generate yellow fluorescence, the yellow fluorescence is combined by the first optical combiner to enter the optical mechanical element, and the second light emitted by the wavelength conversion device is yellow fluorescence at this time, so that the second light emitted by the wavelength conversion device of the embodiment is sequential green fluorescence and red fluorescence; it is understood that when the wavelength conversion device is a multi-fluorescence section, the second light emitted by the wavelength conversion device may be multi-color fluorescence emitted in time sequence.

In a further embodiment, first region 213 of first surface 211 is provided with an antireflective film 215. The incident angles of the first light L incident on the antireflection film 215 in the first region 213 of the first surface 211 are different, so that the proportion of the first light L split by the antireflection film 215 is different, specifically, the proportion of the first light L reflected and transmitted by the antireflection film 215 is different. Specifically, when the incident angle of the first light L incident to the antireflection film 215 is 45 °, the percentage of the portion of the first light L1 reflected by the antireflection film 215 is 3%, and the percentage of the portion of the first light L transmitted by the antireflection film 215 is 97%, at this time, the first light L is blue laser, the first light L1 emits second light through the wavelength conversion device 310, and the second light and the first light L2 are combined by the first light combiner 410 to emit light, so as 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 scattering film 216 is disposed on the second surface 212 to effectively reduce the speckle phenomenon in the blue light display. When light source system 10 is applied to the projection system, the speckle phenomenon during blue light display is more serious, and the first optical splitter 210 that rotates is used in the embodiment to make the second surface 212 rotate ceaselessly to weaken the speckle phenomenon, and set up the scattering film 216 on the second surface 212, further weakened the speckle phenomenon, promoted display effect.

Referring to fig. 1 again, in the present embodiment, the light source system 10 includes a light collection system 320, a dichroic plate 330, a condenser lens 101, an optical uniformizing system 102, a first reflector 109, a relay lens (103, 104, 105, 106), a collimating lens system 107, and a fly eye 108. In this embodiment, the wavelength conversion device 310 is a fluorescent wheel, and the first light combiner 410 and the dichroic plate 330 are blue-reflective and yellow-transmissive dichroic plates. The dodging system 102 may be one of a light bar dodging system, a compound eye dodging system, and a diffuser plate. The condenser lens 101 is disposed between the first light source 100 and the first beam splitter 210, and is configured to condense the first light L and then enter the first beam splitter 210. In fig. 1, the straight line represents the propagation path of the first light L, and the dotted line represents the propagation path of the fluorescent light L.

The propagation path of the first blue laser L1 after the blue laser L is split includes, in order, the light equalizing system 102, the first reflecting mirror 109, the relay lens 103, the dichroic sheet 330, the light collecting system 320, and the fluorescent wheel 310, after the first blue laser L1 reaches the fluorescent wheel 310, the fluorescent wheel 310 is provided with a fluorescent powder, for example, a yellow fluorescent powder, the yellow fluorescent powder is excited by the first blue laser L1 to generate a yellow fluorescent light Y, that is, the first blue laser L1 is converted into the yellow fluorescent light Y, and the yellow fluorescent light Y enters the dichroic sheet 330 through the light collecting system 320, passes through the dichroic sheet 330, and enters the first light combiner 410 through the relay lens 104.

The propagation path of the second blue laser light L2 into which the blue laser light L is split sequentially passes through the

relay lenses

105 and 106 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 are mixed to obtain mixed light, the mixed light enters the collimating lens system 107 and reaches the compound eye 108, and then the yellow fluorescence Y is divided into red fluorescence and green fluorescence G, wherein the red fluorescence enters one spatial light modulator for modulation, and the green fluorescence G and the second blue laser L2 enter the other spatial light modulator for modulation, so that the blue light color coordinate is corrected. In a conventional 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 that the influence of red fluorescence on color coordinates can be eliminated when blue light is displayed, and the color coordinates of blue light display are determined by the second blue laser L2 and the green fluorescence G.

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

Referring to fig. 4 and fig. 5, a second embodiment of the invention provides a light source system, which is different from the first embodiment in that the structure of the first beam splitter 210 is different, specifically, the second region 214 of the first surface 211 of the first beam splitter 210 is the same as the first embodiment, and a beam splitting film 217 is disposed on the first region 213 of the first surface 211. The light-splitting films 217 having different light-splitting ratios make the ratios of the part of the first light L1 and the part of the first light L2, into which the first light L is incident on the light-splitting films 217, different.

In this embodiment, when the first light L is a blue laser, the ratio of the splitting film 217 to the split blue laser L may be set according to actual conditions, that is, the splitting films 217 with different splitting ratios may be set. For example, when the yellow phosphor in the fluorescent wheel 310 is different, the excitation efficiency curve of the yellow phosphor excited and converted by the first blue laser L1 is different from the ratio of the red phosphor to the green phosphor in the fluorescent light, and at this time, the ratio of the yellow phosphor to the second blue laser L2 required to obtain the target blue light is also different, so the ratio of splitting the blue laser L in the first splitter 210 is changed accordingly. In this embodiment, by providing the spectroscopic film 217 in the first region 213, desired various spectral ratios can be obtained.

Referring to fig. 6 to 8, a third embodiment of the invention provides a light source system 10b, which is different from the first embodiment in that an antireflection film is not disposed in a first region 213 of a first surface 211, and the first region 213 is a surface without a coating film. 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, and the first light L passes through the half-wave plate 220 and then enters the first region 213 of the first surface 211.

In this embodiment, the first light L is a blue laser, the blue laser L needs to be split in the first region 213 of the first surface 211, the splitting requirement of the first region 213 of the first surface 211 on the transmittance and the reflectance of the blue laser L is high, and in the first embodiment, the blue laser L is split by plating an antireflection film, but the difficulty of the antireflection film plating process is high, and the cost of the light source is increased, so in this embodiment, the antireflection film is not disposed on the first region 213 of the first surface 211, but the half-wave plate 220 is added between the first light source 100 and the first light splitter 210, and the splitting operation of the blue laser L is achieved by setting the crystal axis direction of the half-wave plate 220 and the polarization direction of the blue laser L.

It can be understood that, assuming that the first area 213 of the first surface 211 is a glass surface, the reflectivity and transmittance of the glass surface of the first area 213 without coating are related to the polarization state of the incident light, when the incident light is p-light of a complete polarization state relative to the glass surface, the incident light transmits through the glass surface in a higher proportion and is reflected by the glass surface in a lower proportion, when the incident light is s-light relative to the glass surface, the incident light transmits through the glass surface in a lower proportion and is reflected by the glass surface in a higher proportion, while the incident light is light of a non-complete polarization state relative to the glass surface, i.e. both partial p-light and partial s-light are included, and the proportion of the partial p-light and the partial s-light incident to the glass surface determines the proportion of the incident light transmitted and reflected by the glass surface. Since the ratio of the p light and the s light incident on the glass surface is related to the polarization state of the incident light, in the embodiment, the half-wave plate 220 is disposed between the first light source 100 and the first beam splitter 210, the polarization direction of the incident light is adjusted after passing through the half-wave plate 220, for example, when the polarization direction of the laser light has an angle α with the crystal axis direction of the half-wave plate 220, the polarization direction of the laser light rotates by 2 α after passing through the half-wave plate 220, and the ratio of the p light and the s light when the laser light with the changed polarization direction enters the glass surface is changed correspondingly. Therefore, the ratio of the p light and the s light incident on the first region 213 is adjusted by adjusting the angle between the polarization direction of the laser and the crystal axis direction of the half-wave plate 220, and the L-splitting ratio of the incident blue laser is adjusted.

In this embodiment, the blue laser L emitted from 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 is less than 3%; when the incident light has a higher reflectivity of about 9% relative to the glass surface of the first region 213, the incident angle of the incident light to the first region 213 is about 45 °, the polarization direction of the incident light to the first region 213 can be adjusted by adding the half-wave plate 220, and the ratio of the p light to the s light to the first region 213 can be adjusted, so as to obtain the proper transmission inverse ratio after being split by the first beam splitter 210.

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

Referring to fig. 9 to 11, a fourth embodiment of the invention provides a light source system 10c, which is different from the first embodiment in that the first beam splitter 210 has a structure different from that of the first embodiment, a first region 213 on a first surface 211 includes a first region 218 and a second region 219 adjacent to the first region, a high-reflection film 221 is disposed on the first region 218, and an anti-reflection film 222 is disposed on the second region 219; the light spot O of the first light L incident on the first region 213 of the first surface 211 is divided into a first light spot O1 and a 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, reflected and 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 region 219, passes through the second surface 212 from the anti-reflection film 222 and reaches the first light combiner 410.

In this embodiment, when the first light L is a blue laser, the ratio of the first spot O1 to the second spot O2 is substantially the ratio of the first blue laser light L1 reflected by the blue laser light L incident on the high-reflection film 221 and the second blue laser light L2 transmitted by the anti-reflection film 222. In this embodiment, the light splitting ratios of the first blue laser light L1 reflected by the high reflection film 221 in the first region 213 and the second blue laser light L2 transmitted by the antireflection film 223 in the first region 213 are adjusted by providing the high reflection film 221 and the antireflection film 222 in the first region 213 of the first surface 211, and by setting the angle at which the blue laser light L is incident on the first region 213.

Referring to fig. 10, in a further embodiment, the first area 218 and the second area 219 are disposed in the first region 213 in a fan shape, and the second area 219 is disposed at the periphery of the first area 218. Since only a small amount of fluorescence G is required to rectify 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 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 disposed between the first light source 100 and the first beam splitter 210, and the first light L is reflected by the reflector 500 and then enters the first beam splitter 210. In this embodiment, the blue laser L is converged to the first beam splitter 210 through the condenser lens 101, the angle of incidence on the condenser lens 101 affects the position of the blue laser L spot O in the first region 213 of the first beam splitter 210, and the angle of incidence on the condenser lens 101 can be changed by adjusting the position of the reflector 500, so that the position of the spot O in the first region 213 of the first beam splitter 210 can be adjusted by adjusting the position angle of the reflector 500, and further the splitting ratio of the blue laser L is changed, and blue color coordinate adjustment is realized. In the present embodiment, the mirror 500 is used to adjust the ratio of the first spot O1 and the second spot O2 incident on the first region 213, so that the operation of adjusting the split ratio is more convenient.

Referring to fig. 12 and 13, a fifth embodiment of the invention provides a light source system 10d, in which the light source system 10d further includes an optical filter 600, the wavelength conversion device 310 is in an annular structure and includes at least one wavelength conversion region, the optical filter 600 is in an annular structure and includes at least one filter region, the optical filter 600 is at least used for filtering the second light, and the optical filter 600 and the wavelength conversion device 310 are coaxially disposed. The wavelength conversion area is used for performing wavelength conversion on incident light, and the filter area is used for filtering the incident light. The mixed light of the filtered second light and the portion of the first light L2 conforms to the DCI color coordinates. The filter 600 filters the second light G appropriately to ensure that the color coordinates of the combined part of the first light L2 and the second light G can reach the required color gamut standard.

In the present embodiment, the light source system 10d includes a blue laser light source 501, a condenser lens 502, a first beam splitter 503, a dodging system 504, relay lenses (505, 509, 511, 512a, and 512b), a dichroic sheet 506, a first light combiner 510, a light collection system 507, a wavelength conversion device 508, a second mirror 513, and a square rod 514. Wherein the dichroic plate 506 and the first light combiner 510 are blue-transmitting and yellow-reflecting dichroic plates, and the square bar 514 is a light uniformizing device. The wavelength conversion device 508 is an annular structure, and a fluorescent layer 311 is disposed on the surface of the wavelength conversion device 508. The fluorescent layer 311 includes an R conversion region, a B conversion region and a G conversion region, wherein the surface of the R conversion region is provided with orange phosphor or yellow phosphor, the surface of the G conversion region is provided with green phosphor, and the surface of the B conversion region is provided with green phosphor. The optical filter 600 is an annular structure and is coaxially arranged with the wavelength conversion device 508, i.e. can synchronously rotate around the same axial direction, wherein the optical filter 600 is arranged at the inner side of the ring of the wavelength conversion section 508, the optical filter 600 comprises an R filter area, a B filter area and a G filter area, the centers of the R filter area and the R filter area are arranged at 180 degrees, the centers of the B filter area and the B filter area are arranged at 180 degrees, the centers of the G filter area and the G filter area are arranged at 180 degrees, and the optical filter 600 is mainly used for filtering incident light to calibrate the color coordinates of emergent 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 region 211 of the first beam splitter 503, the first blue laser light L1 split off at this time is incident on the B conversion region of the fluorescent layer 311 in the wavelength conversion wheel 508. In fig. 12, the straight line represents the propagation path of the blue laser light, and the broken line represents the propagation path of the fluorescent light, as described below.

Blue laser L emitted by a blue laser source 501 is condensed by a condenser lens 502 and then enters a first light splitter 503, the blue laser L is split into first blue laser L1 and second blue laser L2 by the first light splitter 503, the first blue laser L1 sequentially passes through a light homogenizing system 504, a relay lens 505, a dichroic sheet 506, a light collecting system 507 and a wavelength conversion device 508, after the first blue laser L1 reaches the wavelength conversion device 508, the green phosphor of the B conversion region in phosphor layer 311 of wavelength conversion device 508 is excited, green phosphor is generated, that is, first blue laser light L1 is converted into green fluorescent light G in region B of fluorescent layer 311, the green fluorescent light G propagates through light collection system 320 to dichroic plate 506, is reflected by dichroic plate 506 to relay lens 509, enters first light combiner 510, is reflected by first light combiner 510 to relay lens 511, then, the green fluorescence G filtered by the filter 600 is incident on the square rod 514 through the relay lens 511 and the filter 600.

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

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 enters the filter 600 in the fluorescence wheel 508 through the relay lens 511, and the green fluorescence G filtered by the filter 600 enters the square rod 514. At this time, the green fluorescence G is filtered by the optical filter 600 to be modified, 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 appropriately filters the green fluorescence G in the B conversion region to ensure that the color coordinates of the combined light of the second blue laser L2 and the green fluorescence can reach the required color gamut standard.

It is to be understood that the first beam splitter 503 in the above optical path may be any one of the first beam splitters 210 in the first to fourth embodiments.

The invention also provides a projection system comprising a light source system as described in any of the above embodiments. The projection system can adopt various projection technologies, such as liquid crystal display projection technology and digital light path processor projection technology, and the light source system can also be applied to illumination systems, such as stage illumination.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A light source system, comprising:

a first light source for emitting a first light;

the wavelength conversion device is used for carrying out wavelength conversion on the first light to obtain second light;

2. The light source system of claim 1, wherein the first beam splitter comprises a first surface and a second surface opposite to each other, the first surface being disposed opposite to the first light source, and after the first light is incident on a first region of the first 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 beam combiner; or

3. The light source system of claim 2, wherein the first region of the first surface is provided with an antireflective film.

4. The light source system of claim 2, 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 being respectively located in a predetermined optical path in time series, the second region of the first surface being configured to reflect the first light to the wavelength conversion device.

5. The light source system according to claim 2, wherein a spectroscopic film is provided on the first region of the first surface.

6. The light source system of claim 2, further comprising a half-wave plate between the first light source and the first beam splitter, wherein the first light enters the first region of the first surface after passing through the half-wave plate.

7. The light source system of claim 2, wherein the first region of the first surface comprises a first sub-region and a second sub-region that are adjacent to each other, the first sub-region having a high-reflection film thereon, the second sub-region having an anti-reflection film thereon; 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 reaches the wavelength conversion device after being reflected, and the second light spot of the first light is incident on the antireflection film and reaches the first light combiner after penetrating through the second surface from the antireflection film.

8. The light source system of claim 7, wherein a reflector is further disposed between the first light source and the first beam splitter, and the first light is reflected by the reflector and then enters the first beam splitter.

9. The light source system according to any one of claims 1-8, further comprising a filter, wherein the wavelength conversion device is a ring structure and comprises at least one wavelength conversion region;

10. A projection system, characterized in that the projection system comprises a light source system as claimed in any one of claims 1 to 9.