CN111856858B - Light source system and projection system - Google Patents
Light source system and projection system Download PDFInfo
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- CN111856858B CN111856858B CN201910333789.5A CN201910333789A CN111856858B CN 111856858 B CN111856858 B CN 111856858B CN 201910333789 A CN201910333789 A CN 201910333789A CN 111856858 B CN111856858 B CN 111856858B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/206—Control of light source other than position or intensity
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2066—Reflectors in illumination beam
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
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- Optics & Photonics (AREA)
- Projection Apparatus (AREA)
Abstract
The invention provides a light source system, which comprises a first light source, a second light source and a first light source, wherein the first light source is used for emitting first light; wavelength conversion means for performing wavelength conversion on a 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 by the first area and part of the second light emitted by the wavelength conversion device to be emitted along the same light path. The invention also provides a projection system. The light source system provided by the invention converts part of the first light into the second light, and combines the second light with part of the first light to correct the color coordinates of the first light so as to meet the requirement of the color coordinate values of the primary light required by the DCI standard, further improve the color gamut range and reduce the light source cost.
Description
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 blue primary color for display. Considering the problems of the electro-optical conversion efficiency of the laser, the service life of the optical device, and the like, the dominant wavelength of the blue laser commonly used in the laser light source is 455nm. The dominant wavelength of a laser is typically to a tolerance of about + -5 nm, subject to fabrication process limitations.
Cinema projectors using laser light sources need to meet the digital cinema initiative (digital cinema initiative, DCI) standard, and when the dominant wavelength of the lasers is less than 452nm, the y value of the color coordinates is less than 0.02, which can cause the problem that the dominant wavelength of the blue lasers does not meet the DCI blue color coordinate standard, and the blue lasers need 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 when the proportion of blue light to red light and green light is white light, the required red light and green light are more in proportion, and the utilization rate of the blue laser is reduced or the cost is increased.
Disclosure of Invention
In view of this, the present invention provides a light source system. The specific technical scheme is as follows.
A light source system, the light source system comprising:
a first light source for emitting a first light;
wavelength conversion means for performing wavelength conversion on a part of the first light and obtaining second light;
a first beam splitter comprising a first region for guiding part of the first light to the wavelength conversion device and for guiding part of the first light to a first light combiner, and a second region for guiding the first light to the wavelength conversion device;
the first light combiner is configured to guide a portion of the first light emitted from the first area and a portion of the second light emitted from the wavelength conversion device to exit along a same optical path.
In an embodiment, the first light splitter includes a first surface and a second surface disposed opposite to each other, the first surface being disposed opposite to the first light source, the first region of the first surface reflecting a portion of the first light to the wavelength conversion device and transmitting a portion of the first light to the first light combiner after the first light is incident on the first region of the first surface; or (b)
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, the first region of the first surface is provided with an anti-reflection film.
In an embodiment, the first optical splitter may rotate around an axis perpendicular to the first surface, and the first optical splitter further includes a second area disposed adjacent to the first area, where the first area and the second area are respectively located on a preset optical path in a time sequence, and the second area of the first surface is used for reflecting 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 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 and then enters the first region of the first surface.
In an embodiment, the first region of the first surface includes a first sub-region and a second sub-region adjacent to each other, the first sub-region is provided with a high reflection film, and the second sub-region is provided with an anti-reflection film; the light spot of the first light incident on the first area of the first surface is divided into a first light spot and a second light spot which are adjacent, wherein the first light spot of the first light is incident on the high reflection film and reflected to reach the wavelength conversion device, and the second light spot of the first light is incident on the antireflection film and transmitted through the second surface from the antireflection film to reach the first light combiner.
In an embodiment, a reflecting mirror is further disposed between the first light source and the first beam splitter, and the first light is reflected by the reflecting mirror and then enters the first beam splitter.
In an embodiment, the light source system further includes an optical filter, and the wavelength conversion device is an annular structure and includes at least one wavelength conversion region;
the optical filter is of an annular structure and at least comprises a filtering area, the filtering area is at least used for filtering the second light, and the optical filter and the wavelength conversion device are coaxially arranged.
The invention also provides a projection system comprising a light source system as described.
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, and combines the second light with part of the first light to correct the color coordinates of the first light so as to meet the requirement of the color coordinate values of the primary light required by the DCI standard, further improve the color gamut range and reduce the light source cost.
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 view 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 view 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 view 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 view 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
The following description is of the preferred embodiments of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the principle of the invention, and these modifications and variations are also regarded as the scope of the invention.
Referring to fig. 1 to 3, a first embodiment of the present invention provides a light source system 10, wherein the light source system 10 includes a first light source 100, a first beam splitter 210, a wavelength conversion device 310 and a first beam combiner 410. The first light source 100 is configured to emit the first light L, the wavelength conversion device 310 is configured to perform wavelength conversion on a portion of the first light L and obtain the second light, the first beam splitter 210 includes a first area 213, the first area 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 light combiner 410, the first light combiner 410 is configured to guide a portion of the first light L2 emitted from the first area 213 and a portion of the second light emitted from the wavelength conversion device 310 to emit along the same light path, where a percentage range of the first light for guiding the wavelength conversion device 310 is γ,0< γ <10%, that is, when the first light L1 is incident on the first area 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 is understood that at this time, the second light emitted from the wavelength conversion device emits a small amount of the second light through the first light combiner and the second light partially transmits the second light through the first light, so as to adjust a color coordinate of the 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 light path, and the required target light is obtained by adding the second light different from that of the first light L into the first light L to correct the color coordinate value of the first light L.
In this embodiment, the first light L may be any light, preferably blue laser light, and the second light may be any fluorescent light different from the first light L, preferably green fluorescent light or yellow fluorescent light, that is, when the first light L is blue laser light and the second light is green fluorescent light, the green fluorescent light and the blue laser light are combined to make the green fluorescent light correct the color coordinates of the blue light, so as to obtain the required 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 separated green fluorescence and blue laser are modulated and displayed through the same spatial light modulator, and at the moment, 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, the light flux in the light combining channel of the primary light is relatively large, and the second light G is a calibration light, and the light flux in the light combining channel of the primary light is relatively small. In the present embodiment, the first light source 100 is a blue laser light source 100, the blue laser light source 100 is used for generating blue laser light L, the first beam splitter 210 is used for receiving the blue laser light L, the first beam splitter 210 includes at least a first region 213 and a second region 214, wherein the first region 213 receives the blue laser light L and splits the blue laser light L into a first blue laser light L1 and a second blue laser light L2 propagating 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, in this embodiment, the yellow fluorescent light Y may be generated by exciting yellow fluorescent powder with the first blue laser light L1, in other embodiments, the wavelength conversion device 310 includes green fluorescent powder, 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, where the wavelength conversion device 310 includes at least 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 mixes 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 procedure of the blue laser color coordinates, taking the example that the wavelength conversion section of the wavelength conversion device 310 includes yellow phosphor, as follows: let the color coordinates of the second blue laser L2 be (x) B ，y B ) The color coordinates of the first blue laser L1 excited phosphor powder converted into green fluorescence are (x) G ,y G ) The green fluorescence is excited by the first blue laser L1 to generate yellow fluorescence by the yellow fluorescent powder, and the yellow fluorescence is split, and the target blue light color coordinate is (x, y). The ratio of the second blue laser light L2 to the green fluorescence (lumen number) required to reach the target blue color coordinate is
Then, according to the excitation efficiency curve of the yellow fluorescent powder and the ratio of the red fluorescence to the green fluorescence in the fluorescence, 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, and then the first light splitter 210 is arranged according to the light splitting ratio in a matching manner.
It should be noted that, when the wavelength conversion section of the wavelength conversion device 310 includes green fluorescence, the green fluorescence in the above formula is directly generated by the wavelength conversion device 310, and only the light splitting ratio of the first beam splitter 210 to the first blue laser light L1 and the second blue laser light L2 is calculated according to the excitation efficiency curve of the green fluorescent powder, and then the first beam splitter 210 is matched 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 color coordinate values of the primary colors 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 optical 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 after the first light L is incident on the first area 213 of the first surface 211, the first area 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 spectroscope 210 performs time-series spectroscope 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 about an axis perpendicular to the first surface 211, the first beam splitter 210 further includes a second region 214 disposed adjacent to the first region 213, the first region 213 and the second region 214 are respectively and sequentially located on a predetermined optical path, and the second region 214 of the first surface 211 is configured to reflect the first light L to the wavelength conversion device 310. The second areas 214 and the first areas 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 a time-sharing manner 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 area 213, the first light L is divided into a part of first light L1 and a part of first light L2, wherein the part of first light L1 reaches the wavelength conversion device 310 along one path and is converted into a second light, the part of first light L2 reaches the first light combiner 410 along the other path, and the second light and the part of 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, different from the first light L, that can be incident on the second region 214 of the second surface 212 of the first beam splitter 210 and 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 on the second region 214 of the first surface 211 of the first beam splitter 210 is totally reflected to the wavelength conversion device 310 and converted into the second light by the wavelength conversion device 310, the second light and the third light are combined by the first beam combiner 410.
In the first embodiment of the wavelength conversion device, the wavelength conversion device includes only one wavelength conversion region, specifically, a yellow phosphor region or a green phosphor region of a full color region, where the second light emitted from the wavelength conversion device is yellow fluorescent light or green fluorescent light.
In a second embodiment of the wavelength conversion device, the wavelength conversion device includes a plurality of wavelength conversion sections, specifically may include a first wavelength conversion section and a second wavelength conversion section, where the first wavelength conversion section is a yellow phosphor section, the second wavelength conversion section is a green phosphor section, and at this time, the first area of the first optical 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; at this time, the first light emitted by the first light source is reflected into the wavelength conversion device after passing through a time sequence section of the first light splitter, part of the first light incident on the first area of the first light splitter is transmitted into the first light combiner, and the green fluorescent powder section of the wavelength conversion device is excited to generate green fluorescent light, the green fluorescent light passes through the first light combiner and the first light to adjust the color coordinate of the first light, at this time, the second light emitted by the wavelength conversion device is green fluorescent light, and it can be understood that the fluorescent section of the wavelength conversion device needs to consider the color of the first light to be actually adjusted, and when the first light is blue light, the fluorescent section of the wavelength conversion device for adjusting the color coordinate of the first light is the yellow fluorescent powder section or the green fluorescent powder section; when the first light is red light, the fluorescent section of the wavelength conversion device for adjusting the first light color coordinate 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 first light color coordinates 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 fluorescent powder section of the wavelength conversion device is excited to generate yellow fluorescence, the yellow fluorescence enters the optical machine element through the light combination of the first optical combiner, and at the moment, the second light emitted by the wavelength conversion device is yellow fluorescence, so that the second light emitted by the wavelength conversion device in the embodiment is time sequence green fluorescence and red fluorescence; it is understood that when the wavelength conversion device is a multi-fluorescence section, the second light emitted from the wavelength conversion device may be multi-color fluorescence emitted in time sequence.
In a further embodiment, the first region 213 of the first surface 211 is provided with an anti-reflection film 215. The incident angles of the first light L to the antireflection film 215 of 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, specifically, the proportion reflected by the antireflection film 215 and transmitted are different. Specifically, when the incident angle of the first light L 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%, 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 emit light through the first light combiner 410, so as to correct the blue color coordinates of the light source system.
In a further embodiment, the second surface 212 is a scattering surface, and the second surface 212 is provided with the scattering film 216, which can effectively reduce the speckle phenomenon during blue light display. When the light source system 10 is applied to a projection system, the speckle phenomenon is serious during blue light display, and the first rotating beam splitter 210 is used in the embodiment, so that the second surface 212 continuously rotates to weaken the speckle phenomenon, and the scattering film 216 is arranged on the second surface 212, so that the speckle phenomenon is further weakened, and the display effect is improved.
Referring again to fig. 1, in the present embodiment, the light source system 10 includes a light collecting system 320, a dichroic plate 330, a condensing lens 101, a dodging system 102, a first reflecting mirror 109, relay lenses (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 sheet 330 are blue-reflective yellow-transmissive dichroic sheets. The dodging system 102 may be one of a rod dodging system, a compound eye dodging system, and a diffuser. The condensing 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 make the first light L enter the first beam splitter 210. In fig. 1, a straight line represents a propagation path of the first light, and a broken line represents a propagation path of the fluorescent light, and in this embodiment, the first light L is a blue laser light, as described below.
The propagation path of the first blue laser light L1 after the blue laser light L is split is sequentially a dodging system 102, a first reflector 109, a relay lens 103, a dichroic plate 330, a light collecting system 320 and a fluorescent wheel 310, after the first blue laser light L1 reaches the fluorescent wheel 310, fluorescent powder, for example, yellow fluorescent powder, is arranged in the fluorescent wheel 310, and the first blue laser light L1 excites the yellow fluorescent powder to generate yellow fluorescent light Y, that is, the first blue laser light L1 is converted into the yellow fluorescent light Y, and the yellow fluorescent light Y is incident on the dichroic plate 330 through the light collecting system 320, passes through the dichroic plate 330 and then is incident on the first light combiner 410 through the relay lens 104.
The propagation path of the second blue laser light L2 after the blue laser light L is split is sequentially the relay lenses 105 and 106, and then reaches the first combiner 410.
The yellow fluorescent light Y and the second blue laser light L2 reach the first light combiner 410 and then are mixed to obtain mixed light, the mixed light is incident into the collimating lens system 107 and reaches the compound eye 108, and then the yellow fluorescent light Y is divided into red fluorescent light and green fluorescent light G, wherein the red fluorescent light enters one spatial light modulator for modulation, and the green fluorescent light G and the second blue laser light L2 enter the other spatial light modulator for modulation, so that the correction of blue color coordinates is realized. In a typical 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 during blue light display, and the color coordinates of blue light display are determined by the second blue laser L2 and the green fluorescence G.
In other embodiments, a green phosphor may be disposed in the fluorescent wheel 310, and the fluorescent wheel 310 directly converts the first blue laser L1 into the green fluorescence G, and then combines the green fluorescence 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 present invention provides a light source system, which is different from the first embodiment in that the first beam splitter 210 has a different structure, specifically, the second area 214 of the first surface 211 of the first beam splitter 210 is the same as the first embodiment, and the beam splitting film 217 is disposed on the first area 213 of the first surface 211. The light splitting films 217 having different light splitting ratios make the ratio of the part of the first light L1 and the part of the first light L2 split after the first light L is incident on the light splitting films 217 different.
In this embodiment, when the first light L is blue laser light, the ratio of the light splitting film 217 after splitting the blue laser light L may be set according to the actual situation, that is, the light splitting film 217 having different light splitting ratios may be provided. For example, when the yellow phosphors in the fluorescent wheel 310 are different, the ratio of the red fluorescence to the green fluorescence in the excitation efficiency curve and the fluorescence of the yellow phosphors excited and converted by the first blue laser light L1 is different, and at this time, the ratio of the yellow fluorescence required to obtain the target blue light and the ratio of the second blue laser light L2 are also different, so that the ratio of the blue laser light L to be split by the first beam splitter 210 is changed accordingly. In this embodiment, by providing the spectroscopic film 217 in the first region 213, various spectroscopic ratios can be obtained as needed.
Referring to fig. 6 to 8, a third embodiment of the present invention provides a light source system 10b, which is different from the first embodiment in that no anti-reflection film is disposed in a first area 213 of a first surface 211, and the first area 213 is a surface without a coating film. The light source system 10 further includes a half-wave plate 220, where 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 blue laser, and since the first region 213 of the first surface 211 needs to split the blue laser L, the first region 213 of the first surface 211 has a higher requirement for splitting the transmittance and reflectance of the blue laser L, and is implemented by plating an antireflection film in the first embodiment, but the process difficulty of plating the antireflection film is higher, and the light source cost is increased, so in this embodiment, the first region 213 of the first surface 211 is not provided with an antireflection film, and a half wave plate 220 is added between the first light source 100 and the first beam splitter 210, and the beam splitting operation of the blue laser L is implemented by setting the crystal axis direction of the half wave plate 220 and the polarization direction of the blue laser L.
It will be appreciated that assuming that the first region 213 of the first surface 211 is a glass surface, the reflectivity and transmissivity of the glass surface of the uncoated first region 213 are related to the polarization state of incident light, when the incident light is p-light in a complete polarization state with respect to the glass surface, the proportion of the incident light transmitted through the glass surface is high and the proportion reflected by the glass surface is low, when the incident light is s-light with respect to the glass surface, the proportion of the incident light transmitted through the glass surface is high and the proportion reflected by the glass surface is high, and the incident light is generally light in a non-complete polarization state with respect to the glass surface, that is, the proportion of the p-light and the s-light incident on the glass surface is determined by the proportion of the incident light transmitted through and reflected by the glass surface, so that light splitting can be realized. Since the duty ratio of the portion of the p-ray and the portion of the s-ray incident on the glass surface is related to the polarization state of the incident light, in this embodiment, a half-wave plate 220 is disposed between the first light source 100 and the first beam splitter 210, and 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 beam has an angle α with the crystal axis direction of the half-wave plate 220, the polarization direction of the laser beam rotates by 2α after passing through the half-wave plate 220, and the ratio of the p-ray and the s-ray when the laser beam with the changed polarization direction is incident on the glass surface is correspondingly changed. Therefore, the ratio of p light to s light incident on the first region 213 is adjusted by adjusting the angle between the polarization direction of the laser light and the crystal axis direction of the half wave plate 220, and thus the split ratio of the incident blue laser light L is adjusted.
In this embodiment, the blue laser light L emitted from the blue laser light 100 is polarized light with a very high polarization degree, and when the incident light is p-light with respect 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 light with respect to the glass surface of the first region 213, the reflectivity is about 9%, and at this time, the angle of the incident light entering the first region 213 is about 45 °, the polarization direction of the incident light entering the first region 213 can be adjusted by adding the half wave plate 220, so as to adjust the ratio of p light and s light entering the first region 213, and obtain a proper inverse ratio of transmission after being split by the first splitter 210.
It will be appreciated that in this embodiment, when the incident direction of the first light L is fixed, the adjustment of the beam splitting ratio can be achieved in real time by rotating the adjustment half-wave plate 220.
Referring to fig. 9 to 11, a fourth embodiment of the present invention provides a light source system 10c, which is different from the first embodiment in that a first beam splitter 210 has a structure different from that of the first embodiment, a first region 213 of a first surface 211 includes a first region 218 and a second region 219 adjacent to each other, 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 area 213 of the first surface 211 is divided into a first light spot O1 and a second light spot O2, where the first light spot O1 of the first light L is incident on the highly reflective film 221 of the first area 218 and reflected to reach the wavelength conversion device 310, and the second light spot O2 of the first light L is incident on the anti-reflection film 222 of the second area 219 and transmitted from the anti-reflection film 222 to reach the first light combiner 410 after passing through the second surface 212.
In the present embodiment, when the first light L is blue laser light, the ratio of the first light spot O1 and the second light spot O2 is actually the ratio of the first blue laser light L1 incident on the highly reflective film 221 and reflected and the second blue laser light L2 incident on the antireflection film 222 and transmitted. In this embodiment, the spectral ratio 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 is adjusted by providing the high reflection film 221 and the antireflection film 222 in the first region 211, and by providing 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 region 218 and the second region 219 are disposed in a fan shape in the first region 213, and the second region 219 is disposed at the outer periphery of the first region 218. Because only a small amount of fluorescence G is required to correct the second blue laser light L2, the area of the first region 218 is smaller than 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 mirror 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 mirror 500 and then enters the first beam splitter 210. In this embodiment, the blue laser light L is converged to the first beam splitter 210 by the condensing lens 101, the angle of the incident condensing lens 101 affects the position of the blue laser light L spot O in the first area 213 of the first beam splitter 210, and the angle of the incident condensing lens 101 can be changed by adjusting the position of the reflecting mirror 500, so that the position of the spot O in the first area 213 of the first beam splitter 210 can be adjusted by adjusting the position angle of the reflecting mirror 500, and the beam splitting ratio of the blue laser light L can be changed, thereby realizing the adjustment of the blue light color coordinates. In this embodiment, the mirror 500 is used to adjust the ratio of the first spot O1 and the second spot O2 incident on the first area 213, so that the adjustment operation of the splitting ratio is more convenient.
Referring to fig. 12 and 13, a fifth embodiment of the present invention provides a light source system 10d, wherein the light source system 10d further includes a filter 600, the wavelength conversion device 310 has an annular structure and at least includes a wavelength conversion region, the filter 600 has an annular structure and at least includes a filtering region, the filter 600 is at least used for filtering the second light, and the filter 600 and the wavelength conversion device 310 are coaxially disposed. Wherein the wavelength conversion region is used for wavelength conversion of incident light, and the filtering region is used for filtering the incident light. The mixed light of the filtered second light and part of the first light L2 accords with DCI color coordinates. The second light G is properly filtered by the optical filter 600, so as to ensure that the color coordinates of the partial first light L2 and the second light G after being combined 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 512 b), a dichroic sheet 506 and a first beam combiner 510, a light collecting system 507, a wavelength conversion device 508, a second reflecting mirror 513 and a square bar 514. Wherein the dichroic plate 506 and the first light combiner 510 are blue-transparent and yellow-reflective dichroic plates, and the square bar 514 is a light homogenizing device. The wavelength conversion device 508 has 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, where an orange fluorescent powder or a yellow fluorescent powder is disposed on the surface of the R conversion region, a green fluorescent powder is disposed on the surface of the G conversion region, and a green fluorescent powder is disposed on the surface of the B conversion region. The optical filter 600 is an annular structure, and is coaxially disposed with the wavelength conversion device 508, that is, can rotate synchronously around the same axis, wherein the optical filter 600 is disposed inside the ring of the wavelength conversion section 508, the optical filter 600 includes an R filter region, a B filter region, and a G filter region, the centers of the R filter region and the R filter region are disposed at 180 degrees, the centers of the B filter region and the B filter region are disposed at 180 degrees, the centers of the G filter region and the G filter region are disposed at 180 degrees, and the optical filter 600 is mainly used for filtering incident light to calibrate the color coordinates of the emergent light. When 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 at this time is incident on the B conversion region of the fluorescent layer 311 in the wavelength conversion 508. In fig. 12, straight lines represent propagation paths of blue laser light, and broken lines represent propagation paths of fluorescence, as described below.
After the blue laser light L emitted by the blue laser light source 501 is concentrated by the condensing lens 502 and then enters the first beam splitter 503, the first beam splitter 503 splits the blue laser light L1 into the first blue laser light L1 and the second blue laser light L2, the first blue laser light L1 sequentially passes through the light homogenizing system 504, the relay lens 505, the dichroic plate 506, the light collecting system 507 and the wavelength conversion device 508, after the first blue laser light L1 reaches the wavelength conversion device 508, the green fluorescent powder in the B conversion region in the fluorescent layer 311 of the wavelength conversion device 508 is excited, green fluorescent light is generated, that is, the first blue laser light L1 is converted into green fluorescent light G in the B region of the fluorescent layer 311, the green fluorescent light G is transmitted to the dichroic plate 506 through the light collecting system 320, reflected to the relay lens 509 by the dichroic plate 506 and then enters the first light combiner 510, and then reflected to the relay lens 511 by the first light combiner 510, and then enters the filter 600 through the relay lens 511, and the green fluorescent light G filtered by the filter 600 is incident on the square rod 514.
The second blue laser light L2 sequentially passes through the relay lens 512a, the second mirror 513, the relay lens 512b, and the first light combiner 510.
The green fluorescence G and the second blue laser L2 reach the first light combiner 510 and are mixed to obtain mixed light, and the mixed light is then incident into the filter 600 in the fluorescent wheel 508 through the relay lens 511, and the green fluorescence G filtered by the filter 600 is incident into the square bar 514. At this time, the green fluorescence G is filtered by the filter 600 to repair the color, and the green fluorescence G after repair 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 region is properly filtered by the optical filter 600, so as to ensure that the color coordinates of the second blue laser L2 after light combination with the green fluorescence can reach the required color gamut standard.
It is to be understood that the first beam splitter 503 in the optical path described above may be any one of the first beam splitters 210 of the first to fourth embodiments.
The invention also provides a projection system comprising a light source system according to any of the embodiments described above. The projection system can adopt various projection technologies, such as a liquid crystal display projection technology and a digital light path processor projection technology, and the light source system can also be applied to an illumination system, such as stage illumination.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (8)
1. A light source system, the light source system comprising:
a first light source for emitting a first light;
wavelength conversion means for wavelength-converting the first light and obtaining second light;
a first beam splitter comprising a first region for guiding part of the first light to the wavelength conversion device and for guiding part of the first light to a first light combiner, and a second region for guiding the first light to the wavelength conversion device;
the first light combiner is used for guiding part of the first light emitted by the first area and part of the second light emitted by the wavelength conversion device to be emitted along the same light path;
the first light splitter comprises a first surface and a second surface which are arranged opposite to each other, the first surface is opposite to the first light source, after the first light is incident on a first area of the first surface, the first area of the first surface reflects part of the first light to the wavelength conversion device, and transmits part of the first light to the first light combiner; or a first region of the first surface transmitting part of the first light to the wavelength conversion device and reflecting part of the first light to the first light combiner;
a first region of the first surface comprises a first sub-region and a second sub-region which are adjacent to each other, the first sub-region and the second sub-region are arranged in a fan shape, the second sub-region is arranged at the periphery of the first sub-region, and the area of the first sub-region is smaller than that of the second sub-region; the first subarea is provided with a high reflection film, and the second subarea is provided with an antireflection film; the light spot of the first light incident on the first area of the first surface is divided into a first light spot and a second light spot which are adjacent, wherein the first light spot of the first light is incident on the high reflection film and reflected to reach the wavelength conversion device, and the second light spot of the first light is incident on the antireflection film and transmitted through the second surface from the antireflection film to reach the first light combiner.
2. The light source system of claim 1, wherein the first region of the first surface is provided with an anti-reflection film.
3. The light source system of claim 1, wherein the first beam splitter is rotatable about an axis perpendicular to the first surface, the first beam splitter further comprising a second region disposed adjacent to the first region, the first region and the second region each being sequentially positioned on a predetermined optical path, the second region of the first surface being configured to reflect the first light to the wavelength conversion device.
4. The light source system of claim 1, wherein a light splitting film is disposed on the first region of the first surface.
5. The light source system of claim 1, further comprising a half-wave plate positioned between the first light source and the first beam splitter, the first light passing through the half-wave plate before entering the first region of the first surface.
6. The light source system of claim 1, wherein a mirror is further disposed between the first light source and the first beam splitter, and the first light is reflected by the mirror and then enters the first beam splitter.
7. The light source system according to any one of claims 1-6, further comprising a filter, wherein the wavelength conversion device has a ring-like structure and comprises at least one wavelength conversion region;
the optical filter is of an annular structure and at least comprises a filtering area, the filtering area is at least used for filtering the second light, and the optical filter and the wavelength conversion device are coaxially arranged.
8. A projection system comprising a light source system as claimed in any one of claims 1-7.
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| CN201910333789.5A CN111856858B (en) | 2019-04-24 | 2019-04-24 | Light source system and projection system |
| PCT/CN2020/086235 WO2020216262A1 (en) | 2019-04-24 | 2020-04-23 | Light source system and projection system |
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| CN201910333789.5A CN111856858B (en) | 2019-04-24 | 2019-04-24 | Light source system and projection system |
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| CN102736207B (en) * | 2012-05-23 | 2014-10-15 | 深圳市绎立锐光科技开发有限公司 | Assembling methods of double-layer color wheel device |
| JP6056293B2 (en) * | 2012-09-12 | 2017-01-11 | 株式会社リコー | Illumination light source device, projection device equipped with this illumination light source device, and control method of projection device |
| CN104345530B (en) * | 2013-07-30 | 2016-02-10 | 台达电子工业股份有限公司 | Display light source module |
| JP6476667B2 (en) * | 2013-11-01 | 2019-03-06 | 株式会社リコー | Light source device and projector using the same |
| CN105044806B (en) * | 2015-09-15 | 2017-05-31 | 杭州科汀光学技术有限公司 | A kind of dichroscope and projection arrangement that beam function is closed with laser |
| CN205539893U (en) * | 2016-01-14 | 2016-08-31 | 深圳市光峰光电技术有限公司 | Wavelength converters , light source system and projection arrangement |
| CN108535943B (en) * | 2017-03-03 | 2021-07-06 | 深圳光峰科技股份有限公司 | Light source device and projection display system thereof |
| CN107315311B (en) * | 2017-08-11 | 2019-09-20 | 青岛海信电器股份有限公司 | Light source module group and laser projection |
| CN109634039B (en) * | 2019-01-18 | 2021-03-30 | 苏州佳世达光电有限公司 | Wavelength conversion module, projection device and light mixing method of projection device |
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| 阿克塞尔·多涅斯.用于光束调制的光学元件.《激光测量技术原理与应用》.华中科技大学出版社,2017,64-65. * |
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| WO2020216262A1 (en) | 2020-10-29 |
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