CN108663881B - Projection light source and projection system thereof - Google Patents
Projection light source and projection system thereof Download PDFInfo
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- CN108663881B CN108663881B CN201810245714.7A CN201810245714A CN108663881B CN 108663881 B CN108663881 B CN 108663881B CN 201810245714 A CN201810245714 A CN 201810245714A CN 108663881 B CN108663881 B CN 108663881B
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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
- G03B21/2013—Plural light sources
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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
- G03B21/206—Control of light source other than position or intensity
-
- 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
Abstract
The embodiment of the invention relates to a projection light source and a projection system thereof, comprising: the device comprises a blue laser light source, a red laser light source, a rotary fluorescent color wheel, a condensing lens, a first spectroscope and a red laser reflector; the working surface of the rotating fluorescent color wheel is adjacently provided with an annular fluorescent layer and an annular reflection diffusion layer; the blue laser light source, the red laser light source, the condenser lens, the first spectroscope and the red laser reflector are all arranged on one side of the working surface of the rotary fluorescent color wheel, the annular fluorescent layer, the condenser lens, the first spectroscope and the blue laser light source of the rotary fluorescent color wheel are positioned on a first datum line, the red laser reflector and the first spectroscope are positioned on a second datum line, the red laser light source is arranged off-axis, and a red laser beam emitted by the red laser light source and the first datum line form a first off-axis angle a. Through the mode, the color gamut of the projection light source can be improved under the condition that the brightness of the projection light source is not influenced, and meanwhile, the projection light source is compact in structure.
Description
Technical Field
The embodiment of the invention relates to the technical field of projection display, in particular to a projection light source and a projection system thereof.
Background
Laser light is a high brightness, highly directional light source capable of emitting a monochromatic coherent light beam. In recent years, laser is gradually applied to the technical field of projection display as a projection light source because of the advantages of laser, and a projection system using laser as a projection light source has long service life, rich colors and high picture brightness.
In the prior art, a projection light source of a projection system mostly adopts a scheme of exciting a fluorescent powder by a blue laser, wherein the blue light is directly provided by the blue laser, green light is filtered by a green filter section through green fluorescent light generated by exciting the green fluorescent powder by the blue laser, and red light is filtered by a red filter section through yellow fluorescent light generated by exciting the yellow fluorescent powder by the blue laser. In this kind of mode, because ruddiness filters out through yellow fluorescence for ruddiness 'color purity is not high, and then leads to projection light source's colour gamut not high, if strengthen promoting ruddiness 'color purity through more yellow light of filtering, can reduce projection system's ruddiness section efficiency, drags low projection light source's luminance, makes colour gamut and luminance both can't compromise. Therefore, how to improve the color gamut without affecting the brightness of the projection light source becomes an urgent problem to be solved.
Disclosure of Invention
The embodiment of the invention aims to provide a projection light source and a projection system thereof, which can improve the color gamut of the projection light source under the condition of not influencing the brightness of the projection light source, and simultaneously enable the projection light source to have a compact structure, and the volume of the projection light source is not greatly increased due to the addition of a red laser light source.
In order to solve the above technical problem, one technical solution adopted by the embodiment of the present invention is: there is provided a projection light source comprising:
the device comprises a blue laser light source, a red laser light source, a rotary fluorescent color wheel, a condensing lens, a first spectroscope and a red laser reflector;
the working surface of the rotating fluorescent color wheel is provided with an annular fluorescent layer and an annular reflection diffusion layer, and the annular fluorescent layer and the annular reflection diffusion layer are arranged adjacently;
the blue laser light source, the red laser light source, the condenser lens, the first spectroscope and the red laser reflector are all arranged on one side of the working surface of the rotary fluorescent color wheel,
the annular fluorescent layer of the rotating fluorescent color wheel, the condenser lens, the first spectroscope and the blue laser light source are positioned on a first reference line,
the red laser reflector and the first spectroscope are positioned on a second datum line,
the red laser light source is arranged off-axis, so that a red laser beam emitted by the red laser light source and the first reference line form a first off-axis angle a.
Optionally, the first reference line and the second reference line are perpendicular to each other;
the first off-axis angle a satisfies the formula
Wherein d is a distance from a central loop line of the annular reflection diffusion layer to the first reference line, and f is a focal length of the condensing lens.
Optionally, an included angle between the first spectroscope and the first reference line is 45 °;
the red laser reflector is arranged on one side, away from the rotating fluorescent color wheel, of the first spectroscope;
the included angle b between the normal of the red laser reflector and the second datum line satisfies the formula
Optionally, the annular fluorescent layer comprises: a blue laser transmission area, a yellow phosphor area and a green phosphor area;
the projection light source further includes: the first reflector, the second reflector and the second spectroscope;
the second beam splitter is arranged on one side of the working surface of the rotating fluorescent color wheel,
the first reflector and the second reflector are disposed on the other side of the working surface of the rotating fluorescent color wheel,
the first reflector, the annular fluorescent layer of the rotating fluorescent color wheel, the condenser lens, the first beam splitter and the blue laser light source are positioned on a first reference line,
the red laser reflector, the first spectroscope and the second spectroscope are positioned on a second datum line,
the second spectroscope and the second reflector are positioned on a third reference line,
the second reflector and the first reflector are located on a fourth reference line.
Optionally, the first reference line, the second reference line, the third reference line and the fourth reference line are rectangular;
the second reflector and the second beam splitter are parallel to the first beam splitter, and the second reflector, the first beam splitter and the second beam splitter are perpendicular to the first reflector.
Optionally, the annular fluorescent layer comprises: a blue laser reflection area, a yellow phosphor area and a green phosphor area;
the projection light source further includes: a blue laser mirror;
the blue laser light source is arranged off-axis, so that a second off-axis angle c is formed between the blue laser beam emitted by the blue laser light source and the first reference line.
Optionally, the second off-axis angle c satisfies the formula
Wherein d is2And f is the distance from the sideline of the annular fluorescent layer to the first reference line, and f is the focal length of the condensing lens.
Optionally, the annular fluorescent layer comprises: a blue laser reflection scattering area, a yellow phosphor area and a green phosphor area;
the first spectroscope includes: a first reflective segment, a second reflective segment, and a transmissive segment;
the transmission section is arranged between the first reflection section and the second reflection section;
the transmissive section is used for transmitting blue light and red light and reflecting other color light beams.
Optionally, the length of the transmission segment is not less than the blue light spot diameter, and the smaller the length of the transmission segment, the smaller the blue light loss.
Optionally, the projection light source further comprises:
rotating the filtering color wheel;
and the working surface of the rotary filtering color wheel is provided with an annular filtering layer, and the annular filtering layer of the rotary filtering color wheel is positioned on the second datum line.
In order to solve the above technical problem, another technical solution adopted by the embodiment of the present invention is: there is provided a projection system comprising:
display chip, projection lens and the above-mentioned projection light source.
The beneficial effects of the embodiment of the invention are as follows: in contrast to the prior art, the embodiment of the present invention provides a projection light source and a projection system thereof, where the projection light source includes: the working surface of the rotary fluorescent color wheel is provided with an annular fluorescent layer and an annular reflection diffusion layer, and the annular fluorescent layer and the annular reflection diffusion layer are arranged adjacently; the blue laser light source, the red laser light source, the condenser lens, the first spectroscope and the red laser reflector are all arranged on one side of the working surface of the rotary fluorescent color wheel, the annular fluorescent layer, the condenser lens, the first spectroscope and the blue laser light source of the rotary fluorescent color wheel are positioned on a first datum line, the red laser reflector and the first spectroscope are positioned on a second datum line, and the red laser light source is arranged in an off-axis mode, so that a red laser beam emitted by the red laser light source and the first datum line form a first off-axis angle a. According to the embodiment, the red laser light source is added in the projection light source to replace a mode of filtering yellow light so as to improve the color purity of red light, the brightness of the projection light source can not be influenced while the color gamut of the projection light source is improved, and the brightness and the color gamut of the projection light source are ensured; meanwhile, the annular reflection diffusion layer is arranged in the projection light source, and the red laser light source is arranged in an off-axis mode, so that the red laser light source and the blue laser light source can be arranged on the same side, the space between the rotary fluorescent color wheel and the blue laser light source is reasonably utilized, the projection light source is compact in structure, and the size cannot be greatly increased due to the addition of the red laser light source.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of a projection light source according to an embodiment of the present invention;
FIG. 2 is a diagram of an optical path of a projection light source according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a rotating fluorescent color wheel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a projection light source according to a second embodiment of the present invention;
FIG. 5 is a diagram of an optical path of a projection light source according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of a rotating fluorescent color wheel according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a projection light source according to a third embodiment of the present invention;
fig. 8 is an optical path diagram of a projection light source according to a third embodiment of the present invention;
fig. 9 is a schematic structural diagram of a rotating fluorescent color wheel according to a third embodiment of the present invention.
Referring to fig. 1 to 9,1 is a projection light source, 11 is a blue laser light source, 12 is a red laser light source, 21 is a rotating fluorescent color wheel, 211 is an annular reflective diffusion layer, 212 is an annular fluorescent layer, 2121 is a green fluorescent powder region, 2122 is a yellow fluorescent powder region, 2123 is a blue laser transmission region, 2124 is a blue laser reflection region, 2125 is a blue laser reflective diffusion region, 213 is a first driving device, 22 is a rotating filter color wheel, 221 is an annular filter layer, 222 is a second driving device, 31 is a condenser lens, 41 is a first beam splitter, 411 is a first reflection section, 412 is a second reflection section, 413 is a transmission section, 42 is a second beam splitter, 51 is a red laser reflection mirror, 52 is a first reflection mirror, 53 is a second reflection mirror, and 54 is a blue laser reflection mirror.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail and fully with reference to the accompanying drawings. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.
In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example one
Referring to fig. 1, a schematic structural diagram of a projection light source according to an embodiment of the present invention is shown, where the projection light source 1 is applied to a projection system, and includes: the blue laser light source 11, the red laser light source 12, the rotating fluorescent color wheel 21, the rotating filtering color wheel 22, the condensing lens 31, the first beam splitter 41, the second beam splitter 42, the red laser reflector 51, the first reflector 52 and the second reflector 53, wherein the blue laser light source 11, the red laser light source 12, the rotating fluorescent color wheel 21, the rotating filtering color wheel 22, the condensing lens 31, the first beam splitter 41, the second beam splitter 42, the red laser reflector 51, the first reflector 52 and the second reflector 53 are all arranged on the same horizontal plane.
Specifically, the blue laser light source 11 is configured to emit a blue laser beam, and includes a plurality of blue laser emitting chips (not shown), a first light combining device (not shown), and a first collimating lens group (not shown). Each blue laser light-emitting chip is used for emitting corresponding blue laser light to the first light combining device, the first light combining device is used for receiving the corresponding blue laser light and emitting a plurality of blue laser light to the first collimating lens group, and the first collimating lens group is used for emitting the received plurality of blue laser light in the same direction to form a parallel blue laser light beam. The first light combination device comprises a plurality of blue light reflectors. Each blue reflector is arranged in front of a corresponding blue laser light emitting chip and used for emitting blue laser emitted by the corresponding blue laser light emitting chip towards the first collimating lens group. Of course, in some alternative embodiments, the blue laser light source 11 may also be a blue laser light emitting chip.
The red laser light source 12 is used for emitting a red laser beam, and includes a plurality of red laser light emitting chips (not shown), a second light combining device (not shown), and a second collimating lens group (not shown). Each red laser light-emitting chip is used for emitting corresponding red laser to the second light combining device, the second light combining device is used for receiving the corresponding red laser and emitting a plurality of red lasers to the second collimating lens group, and the second collimating lens group is used for emitting the received plurality of red lasers in the same direction to form a parallel red laser beam. The second light combination device comprises a plurality of red light reflectors. Each red light reflector is arranged in front of a corresponding red laser light emitting chip and used for emitting red laser emitted by the corresponding red laser light emitting chip towards the first collimating lens group. Of course, in some alternative embodiments, the red laser light source 12 may also be a red laser light emitting chip.
Referring to fig. 1 to 3, the rotating fluorescent color wheel 21 includes: an annular reflective diffusion layer 211, an annular fluorescent layer 212, and a first driving device 213.
The annular reflection and diffusion layer 211 and the annular fluorescent layer 212 are coaxially arranged on the working surface P1 of the rotating fluorescent color wheel 21, and the inner diameter of the annular reflection and diffusion layer 211 is consistent with the outer diameter of the annular fluorescent layer 212, that is, the annular reflection and diffusion layer 211 and the annular fluorescent layer 212 are adjacently arranged and the annular reflection and diffusion layer 211 is positioned on the outer ring side of the working surface P1 of the rotating fluorescent color wheel 21, and the annular fluorescent layer 212 is positioned on the inner ring side of the working surface P1 of the rotating fluorescent color wheel 21.
Of course, in some alternative embodiments, the inner diameter of the annular reflective diffusion layer 211 may also be larger than the outer diameter of the annular fluorescent layer 212, i.e. there is a gap between the annular reflective diffusion layer 211 and the annular fluorescent layer 212.
The working plane P1 of the rotating color wheel 21 faces the blue laser light source 11 and the red laser light source 12, and is a surface for receiving the blue laser beam and the red laser beam.
Further, the annular reflection diffusion layer 211 is used for receiving the red laser beam emitted from the red laser light source 12 and diffusively reflecting the received red laser beam to eliminate the speckle of the red laser beam.
The annular fluorescent layer 212 is used for receiving the blue laser beam emitted from the blue laser light source 11. Specifically, referring to fig. 3, annular fluorescent layer 212 includes green phosphor region 2121, yellow phosphor region 2122, and blue laser transmitting region 2123, green phosphor region 2121, yellow phosphor region 2122, and blue laser transmitting region 2123 are disposed along a circumferential direction of annular fluorescent layer 212, and areas of green phosphor region 2121, yellow phosphor region 2122, and blue laser transmitting region 2123 are the same.
Of course, in some embodiments, the areas of the green phosphor region 2121, the yellow phosphor region 2122 and the blue laser transmission region 2123 may be set in unequal ratios according to actual needs.
When the blue laser beam is incident to the green phosphor region 2121 of the annular phosphor layer 212, the green phosphor region 2121 absorbs the blue laser beam and is stimulated to reflect green phosphor;
when the blue laser beam is incident to the yellow phosphor region 2122 of the annular phosphor layer 212, the yellow phosphor region 2122 absorbs the blue laser beam and is stimulated to reflect yellow phosphor;
when the blue laser beam is incident to blue laser transmitting region 2123 of annular fluorescent layer 212, blue laser transmitting region 2123 transmits the blue laser beam.
The first driving device 213 is used for driving the rotating fluorescent color wheel 21 to rotate, and is disposed on the other surface opposite to the working plane P1 of the rotating fluorescent color wheel 21, preferably, the first driving device 213 is disposed in the middle of the surface, so that the first driving device 213 can smoothly drive the rotating fluorescent color wheel 21 to rotate. The first driving device 213 may be a motor or the like.
The rotating filter color wheel 22 includes: an annular filter layer 221 and a second driving device 222.
The annular filter layer 221 is disposed on the working plane P2 of the rotating filter color wheel 22, is disposed coaxially with the rotating filter color wheel 22, and has an area smaller than that of the working plane P2 of the rotating filter color wheel 22, and the annular filter layer 221 is configured to receive the red laser beam, the blue laser beam, the yellow fluorescence, and the green fluorescence.
The working plane P2 of the rotating color filter wheel 22 is a surface for receiving the blue laser beam, the red laser beam, the yellow fluorescent light, and the green fluorescent light.
Specifically, the annular filter layer 221 includes a red filter segment (not shown), a blue filter segment (not shown), and a green filter segment (not shown), which are disposed along a circumferential direction of the annular filter layer 221, and whose area areas correspond to the area areas of the green phosphor region 2121, the yellow phosphor region 2122, and the blue laser transmission region 2123.
When the blue laser beam, the red laser beam, the yellow fluorescence and the green fluorescence are incident to the red filter segment of the annular filter layer 221, the red filter segment transmits the red laser beam and is capable of filtering a yellow wavelength band of the yellow fluorescence to transmit the red fluorescence, wherein the yellow wavelength bands of the green fluorescence, the blue laser beam and the yellow fluorescence are filtered;
when the blue laser beam, the red laser beam, the yellow fluorescence and the green fluorescence are incident to the blue filter segment of the annular filter layer 221, the blue filter segment transmits the blue laser beam, wherein the green fluorescence, the red laser beam and the yellow fluorescence are filtered;
when the blue laser beam, the red laser beam, the yellow fluorescence, and the green fluorescence are incident on the green filter segment of the annular filter layer 221, the green filter segment transmits the green fluorescence, wherein the blue laser beam, the red laser beam, and the yellow fluorescence are filtered out.
The second driving device 222 is used for driving the rotation of the rotating color filter wheel 22, and is disposed on the other surface opposite to the working plane P2 of the rotating color filter wheel 22, preferably, the second driving device 222 is disposed in the middle of the surface, so that the second driving device 222 can smoothly drive the rotation of the rotating color filter wheel 22. The second driving device 222 may be a motor or the like.
Preferably, the second driving device 222 rotates synchronously with the first driving device 213 to make the green phosphor region 2121 of the rotating fluorescent color wheel 21 correspond to the green filter segment of the rotating filter color wheel 22, so that the green fluorescent light reflected from the green phosphor region 2121 can pass through the green filter segment; the yellow phosphor region 2122 of the rotating color wheel 21 corresponds to the red filter segment of the rotating color wheel 22, so that the yellow phosphor reflected from the yellow phosphor region 2122 can pass through the red filter segment; the blue laser transmission region 2123 of the rotating fluorescent color wheel 21 corresponds to the blue filter segment of the rotating filter color wheel 22 so that the blue laser beam transmitted from the blue laser transmission region 2123 can pass through the blue filter segment.
The condensing lens 31 may be a biconvex lens for condensing light.
The first beam splitter 41 and the second beam splitter 42 are of a planar transflective structure. Wherein, the first beam splitter 41 can transmit the blue laser beam and the red laser beam and reflect the green fluorescence and the yellow fluorescence; the second beam splitter 42 is capable of reflecting the blue laser beam and transmitting the red laser beam, the yellow fluorescent light, and the green fluorescent light.
The red laser mirror 51, the first mirror 52, and the second mirror 53 are plane mirrors. The red laser reflector 51 is used for reflecting the red laser beam, and the first reflector 52 and the second reflector 53 are used for reflecting the blue laser beam.
Of course, in some alternative embodiments, the red laser reflector 51, the first reflector 52 and the second reflector 53 may also be arc reflectors or curved reflectors, etc.
Further, the blue laser light source 11, the red laser light source 12, the condenser lens 31, the first beam splitter 41, the second beam splitter 42, and the red laser reflector 51 are all disposed on the side of the working plane P1 of the rotating fluorescent color wheel 21, the first reflector 52 and the second reflector 53 are all disposed on the other side (the side far from the working plane P1) of the working plane P1 of the rotating fluorescent color wheel 21, and,
the first reflecting mirror 52, the annular fluorescent layer 212 of the rotating fluorescent color wheel 21, the condenser lens 31, the first beam splitter 41, and the blue laser light source 11 are sequentially located on a first reference line S1, that is, the central axes of the first reflecting mirror 52, the annular fluorescent layer 212 of the rotating fluorescent color wheel 21, the condenser lens 31, the first beam splitter 41, and the blue laser light source 11 coincide with the first reference line S1;
the red laser mirror 51, the first beam splitter 41, the second beam splitter 42 and the annular filter layer 221 of the rotary filter color wheel 22 are sequentially located on a second reference line S2, that is, the central axes of the red laser mirror 51, the first beam splitter 41, the second beam splitter 42 and the annular filter layer 221 of the rotary filter color wheel 22 coincide with the second reference line S2;
the second beam splitter 42 and the second reflecting mirror 53 are sequentially positioned on a third reference line S3, that is, the central axes of the second beam splitter 42 and the second reflecting mirror 53 coincide with the third reference line S3;
the second reflecting mirror 53 and the first reflecting mirror 52 are sequentially positioned on a fourth reference line S4, that is, the central axes of the second reflecting mirror 53 and the first reflecting mirror 52 coincide with the fourth reference line S4;
the red laser source 12 is disposed off-axis, so that the emitted red laser beam and the first reference line S1 form a first off-axis angle a, which satisfies the formula
Where d is the distance from the central loop line of the annular reflection/diffusion layer 211 to the first reference line S1, and f is the focal length of the condenser lens 31. The red laser light source 12 is arranged in an off-axis mode, the annular reflection diffusion layer 211 is arranged, and red laser beams emitted by the red laser light source 12 are reflected, so that the red laser light source and the blue laser light source can be arranged on the same side, the space between the rotary fluorescent color wheel and the blue laser light source is reasonably utilized, the structure of the projection light source is more compact, and the size of the projection light source cannot be greatly increased due to the addition of the red laser light source.
The first reference line S1, the second reference line S2, the third reference line S3 and the fourth reference line S4 are located in the same plane and are perpendicular to each other, and are rectangular.
Specifically, the first beam splitter 41 is located between the working plane P1 of the rotating fluorescent color wheel 21 and the blue laser light source 11, the working plane P1 of the rotating fluorescent color wheel 21 is perpendicular to the first reference line S1, the blue laser beam emitted from the blue laser source 11 coincides with the first reference line S1, the first beam splitter 41 forms an angle of 45 degrees with the first reference line S1, so that the first surface P3 of the first beam splitter 41 faces the working plane P1 of the rotating fluorescent color wheel 21, the second surface P4 faces the blue laser light source 11, the first beam splitter 41 is used for transmitting the blue laser beam emitted from the blue laser light source 11 to the annular fluorescent layer 212 of the rotating fluorescent color wheel 21, the green fluorescent light reflected by the green phosphor region 2121 of the annular phosphor layer 212 and the yellow fluorescent light reflected by the yellow phosphor region 2122 are reflected and used for transmitting the red laser beam diffused and reflected by the annular reflection diffusion layer 211;
the condenser lens 31 is located between the working plane P1 of the rotating fluorescent color wheel 21 and the first surface P3 of the first beam splitter 41, is perpendicular to the first reference line S1, and is configured to condense the light beam incident on the working plane P1 of the rotating fluorescent color wheel 21 and the light beam emitted from the working plane P1 of the rotating fluorescent color wheel 21, so that each light beam can be accurately condensed to a target position;
the first reflecting mirror 52 is located on the other side of the working plane P1 of the rotating fluorescent color wheel 21 and perpendicular to the first beam splitter 41, i.e. the reflecting surface of the first reflecting mirror 52 faces the rotating fluorescent color wheel 21, for reflecting the blue laser beam transmitted by the blue laser transmitting area 2123 of the rotating fluorescent color wheel 21 to change the direction of the blue laser beam;
the reflecting surface of the second reflecting mirror 53 faces the reflecting surface of the first reflecting mirror 52, and the second reflecting mirror 53 is parallel to the first beam splitter 41 and perpendicular to the first reflecting mirror 52, and is used for reflecting the blue laser beam reflected by the first reflecting mirror 52 and changing the direction of the blue laser beam again;
the second beam splitter 42 is parallel to the first beam splitter 41 and the second reflector 53, perpendicular to the first reflector 52, and has one surface facing the reflection surface of the second reflector 53 and the working surface P2 of the rotating filter color wheel 22 and the other surface facing the first surface P3 of the first beam splitter 41, for reflecting the blue laser beam reflected by the second reflection surface 53 to the annular filter layer 221 of the rotating filter color wheel 22, and for transmitting the yellow fluorescent light and the green fluorescent light reflected by the first beam splitter 41 and the transmitted red laser beam to the annular filter layer 221 of the rotating filter color wheel 22;
the reflecting surface of the red laser reflector 51 faces the second surface P4 of the first beam splitter 41 (the first beam splitter 41 is far away from the rotating fluorescent color wheel 21), and the normal of the red laser reflector 51 forms an included angle b with the second reference line S2, wherein the included angle b satisfies the formula
The red laser beam is used for reflecting the red laser beam transmitted by the first beam splitter 41 to the first beam splitter 41, transmitting the red laser beam to the second beam splitter 42 through the first beam splitter 41, and transmitting the red laser beam to the annular filter layer 221 of the rotary filtering color wheel 22 through the second beam splitter 42 for filtering;
the red laser source 12 is located on a side far from the reflection surface of the red laser reflector 51, and forms a first off-axis angle a with the first reference line S1, so that the red laser source can reasonably utilize space, has a compact structure, and does not greatly increase the volume of the projection light source even if the volume of the projection light source of the red laser source is increased.
In summary, it can be understood that, referring to fig. 2, the blue laser light source 11 emits a blue laser light beam, the blue laser light beam transmits to the condenser lens 31 through the first beam splitter 41, and then converges to the annular fluorescent layer 212 of the rotating fluorescent color wheel 21 through the condenser lens 31, if the blue laser light beam converges to the green fluorescent powder region 2121 of the annular fluorescent layer 212, the blue laser light beam is absorbed by the green fluorescent powder region 2121 and reflected to generate green fluorescent light, the green fluorescent light is reflected to the condenser lens 31 and converged to the first beam splitter 41 through the condenser lens 31, and then reflected to the second beam splitter 42 through the first beam splitter 41, and then transmitted to the annular filter layer 221 of the rotating filtering color wheel 22 through the second beam splitter 42 for filtering; if the blue laser beam converges to the yellow phosphor region 2122 of the annular phosphor layer 212, the blue laser beam is absorbed by the yellow phosphor region 2122 and reflects yellow phosphor, and the yellow phosphor is reflected to the condenser lens 31 and converged to the first beam splitter 41 through the condenser lens 31, reflected to the second beam splitter 42 through the first beam splitter 41, and transmitted to the annular filter layer 221 of the rotating color filter wheel 22 through the second beam splitter 42 for filtering; if the blue laser beam converges on the blue laser transmission region 2123 of the annular fluorescent layer 212, the blue laser beam is transmitted to the first reflecting mirror 52 through the blue laser transmission region 2123, then reflected to the second reflecting mirror 53 through the first reflecting mirror 52, then reflected to the second beam splitter 42 through the second reflecting mirror 53, and then transmitted to the annular filter layer 221 of the rotary color filter wheel 22 through the second beam splitter 42 for filtering; meanwhile, the red laser light source 12 emits a red laser beam, which is off-axis incident to the condenser lens 31, converged to the annular reflection diffusion layer 211 of the rotating fluorescent color wheel 21 via the condenser lens 31, then diffused and reflected to the condenser lens 31 via the annular reflection diffusion layer 211 to change the direction of the red laser beam, converged to the red laser reflector 51 via the condenser lens 31, reflected to the first beam splitter 41 via the red laser reflector 51, transmitted to the second beam splitter 42 via the first beam splitter 41, and transmitted to the annular filter layer 221 of the rotating filtering color wheel 22 via the second beam splitter 42 for filtering.
The red light, the blue light and the green light with high color purity are obtained after the light is filtered by the annular filter layer 221, and the white light with high color gamut can be obtained after the obtained red light, the obtained blue light and the obtained green light are combined.
The beneficial effects of the embodiment of the invention are as follows: in contrast to the prior art, the embodiment of the present invention provides a projection light source and a projection system thereof, where the projection light source includes: the working surface of the rotary fluorescent color wheel is provided with an annular fluorescent layer and an annular reflection diffusion layer, and the annular fluorescent layer and the annular reflection diffusion layer are arranged adjacently; the blue laser light source, the red laser light source, the condenser lens, the first spectroscope and the red laser reflector are all arranged on one side of the working surface of the rotary fluorescent color wheel, the annular fluorescent layer, the condenser lens, the first spectroscope and the blue laser light source of the rotary fluorescent color wheel are positioned on a first datum line, the red laser reflector and the first spectroscope are positioned on a second datum line, and the red laser light source is arranged in an off-axis mode, so that a red laser beam emitted by the red laser light source and the first datum line form a first off-axis angle a. According to the embodiment, the red laser light source is added in the projection light source to replace a mode of filtering yellow light so as to improve the color purity of red light, the brightness of the projection light source can not be influenced while the color gamut of the projection light source is improved, and the brightness and the color gamut of the projection light source are ensured; meanwhile, the annular reflection diffusion layer is arranged in the projection light source, and the red laser light source is arranged in an off-axis mode, so that the red laser light source and the blue laser light source can be arranged on the same side, the space between the rotary fluorescent color wheel and the blue laser light source is reasonably utilized, the projection light source is compact in structure, and the size cannot be greatly increased due to the addition of the red laser light source.
Example two
Please refer to fig. 4, which is a schematic structural diagram of a projection light source according to an embodiment of the present invention, where the projection light source 1 is applied to a projection system, the projection light source 1 is substantially the same as the projection light source described in the first embodiment, and the same contents can be referred to in the first embodiment, and further description is omitted here.
The difference is that the projection light source 1 according to the embodiment of the present invention includes: a blue laser light source 11, a red laser light source 12, a rotating fluorescent color wheel 21, a rotating filter color wheel 22, a condenser lens 31, a first beam splitter 41, a red laser mirror 51, and a blue laser mirror 54.
Specifically, referring to fig. 6, the annular fluorescent layer 212 of the rotating fluorescent color wheel 21 includes a green fluorescent powder region 2121, a yellow fluorescent powder region 2122 and a blue laser reflection region 2124, the green fluorescent powder region 2121, the yellow fluorescent powder region 2122 and the blue laser reflection region 2124 are arranged along the circumferential direction of the annular fluorescent layer 212, and the areas of the green fluorescent powder region 2121, the yellow fluorescent powder region 2122 and the blue laser reflection region 2124 are the same.
Of course, in some embodiments, the areas of the green phosphor region 2121, the yellow phosphor region 2122 and the blue laser reflection region 2124 may be set in unequal proportions according to actual needs.
When the blue laser beam is incident to the green phosphor region 2121 of the annular phosphor layer 212, the green phosphor region 2121 absorbs the blue laser beam and is stimulated to reflect green phosphor;
when the blue laser beam is incident to the yellow phosphor region 2122 of the annular phosphor layer 212, the yellow phosphor region 2122 absorbs the blue laser beam and is stimulated to reflect yellow phosphor;
when the blue laser beam is incident to the blue laser reflection area 2124 of the annular fluorescent layer 212, the blue laser reflection area 2124 reflects the blue laser beam so that the blue laser beam can be reflected to the blue laser reflection mirror 54 to change the direction of the blue laser beam, which can reduce the use of optical elements and make the structure compact.
The blue laser mirror 54 is a plane mirror for reflecting the blue laser beam.
Of course, in some alternative embodiments, the blue laser reflector 54 may also be an arc reflector or a curved reflector, etc.
Further, the blue laser light source 11, the red laser light source 12, the condenser lens 31, the first beam splitter 41, the red laser mirror 51, and the blue laser mirror 54 are disposed on the side of the working plane P1 of the rotating fluorescent color wheel 21, and,
the annular fluorescent layer 212, the condenser lens 31 and the first beam splitter 41 of the rotating fluorescent color wheel 21 are sequentially located on a first reference line S1, that is, the central axes of the annular fluorescent layer 212, the condenser lens 31 and the first beam splitter 41 of the rotating fluorescent color wheel 21 coincide with the first reference line S1;
the red laser mirror 51, the first beam splitter mirror 41 and the annular filter layer 221 of the rotary filter color wheel 22 are sequentially located on a second reference line S2, that is, the central axes of the red laser mirror 51, the first beam splitter mirror 41 and the annular filter layer 221 of the rotary filter color wheel 22 coincide with the second reference line S2;
the blue laser reflector 54 is located on the second surface P4 side of the first beam splitter 41 and is not located on the first reference line S1 and the second reference line S2;
a blue laser light source 11The off-axis arrangement is arranged, so that the blue laser beam emitted by the off-axis arrangement forms a second off-axis angle c with the first reference line S1, and the second off-axis angle c satisfies the formula
Wherein d is2Is the distance from the edge line of the annular fluorescent layer 212 to the first reference line S1, and f is the focal length of the condenser lens;
the red laser source 12 is also disposed off-axis so that the emitted red laser beam and the first reference line S1 form a first off-axis angle a, which satisfies the formula
Where d is the distance from the central loop line of the annular reflection/diffusion layer 211 to the first reference line S1, and f is the focal length of the condenser lens 31. The red laser light source 12 is arranged in an off-axis mode, the annular reflection diffusion layer 211 is arranged, and red laser beams emitted by the red laser light source 12 are reflected, so that the red laser light source and the blue laser light source can be arranged on the same side, the space between the rotary fluorescent color wheel and the blue laser light source is reasonably utilized, the structure of the projection light source is more compact, and the size of the projection light source cannot be greatly increased due to the addition of the red laser light source.
The first reference line S1 and the second reference line S2 are located in the same plane and are perpendicular to each other.
Specifically, the first beam splitter 41 is located between the working plane P1 of the rotating fluorescent color wheel 21 and the blue and red laser light sources 11 and 12, the working plane P1 of the rotating fluorescent color wheel 21 is perpendicular to the first reference line S1, the blue laser beam emitted from the blue laser light source 11 forms a second off-axis angle c with the first reference line S1, the red laser beam emitted from the red laser light source 12 forms a first off-axis angle a with the first reference line S1, the first beam splitter 41 forms an angle of 45 ° with the first reference line S1, such that the first surface P3 of the first beam splitter 41 faces the working plane P1 of the rotating fluorescent color wheel 21, and the first surface P3 also faces the working plane P2 of the rotating color wheel filter 22, the second surface P4 faces the blue and red laser light sources 11 and 12, and the second surface P4 also faces the red laser reflector 51 and the blue laser reflector 54, the first beam splitter 41 is configured to transmit the red laser beam emitted by the red laser light source 12 to the annular reflective diffusion layer 211 of the rotating color wheel 21, and transmit the red laser beam reflected by the red laser mirror 51 to the annular filter layer 221 of the rotating color wheel 22; and is also used for reflecting the green fluorescent light reflected by the green fluorescent powder region 2121 of the annular fluorescent layer 212 and the yellow fluorescent light reflected by the yellow fluorescent powder region 2122 to the annular filter layer 221 of the rotating filter color wheel 22, transmitting the blue laser beam reflected by the blue laser reflection region 2124, and transmitting the blue laser beam reflected by the blue laser mirror 54 to the annular filter layer 221 of the rotating filter color wheel 22;
the condenser lens 31 is located between the working plane P1 of the rotating fluorescent color wheel 21 and the first surface P3 of the first beam splitter 41, is perpendicular to the first reference line S1, and is configured to condense the light beam incident on the working plane P1 of the rotating fluorescent color wheel 21 and the light beam emitted from the working plane P1 of the rotating fluorescent color wheel 21, so that each light beam can be accurately condensed to a target position;
the reflecting surface of the red laser reflector 51 faces the second surface P4 of the first beam splitter 41 (the first beam splitter 41 is far away from the rotating fluorescent color wheel 21), and the normal of the red laser reflector 51 forms an included angle b with the second reference line S2, wherein the included angle b satisfies the formula
For reflecting the red laser beam diffused and reflected by the ring-shaped reflection and diffusion layer 211 of the rotating fluorescent color wheel 21 to the first beam splitter 41;
the reflection surface of the blue laser reflector 54 faces the second surface P4 of the first beam splitter 41 (the first beam splitter 41 is far away from the rotating fluorescent color wheel 21), is adjacent to the red laser reflector 51, and the normal line of the blue laser reflector 54 forms an included angle b '(not shown) with the second reference line S2, and the included angle b' satisfies the formula
For reflecting the blue laser beam transmitted by the first beam splitter 41 toThe direction of the blue laser beam is changed.
According to the embodiment of the invention, the use of the optical elements is reduced, and the optical elements are concentrated on one side, so that the structure is more compact.
In summary, it can be understood that, referring to fig. 5, the blue laser light source 11 emits a blue laser light beam, the blue laser light beam is off-axis incident to the condenser lens 31, and is converged to the annular fluorescent layer 212 of the rotating fluorescent color wheel 21 through the condenser lens 31, if the blue laser light beam is converged to the green fluorescent powder region 2121 of the annular fluorescent layer 212, the green fluorescent light beam is absorbed by the green fluorescent powder region 2121 and reflected to form green fluorescent light, the green fluorescent light beam is reflected to the condenser lens 31 and converged to the first beam splitter 41 through the condenser lens 31, and is reflected to the annular filter layer 221 of the rotating filtering color wheel 22 through the first beam splitter 41 for filtering; if the blue laser beam converges to the yellow phosphor region 2122 of the annular phosphor layer 212, the blue laser beam is absorbed by the yellow phosphor region 2122 and reflects yellow phosphor, and the yellow phosphor is reflected to the condenser lens 31 and converged to the first beam splitter 41 by the condenser lens 31, and then reflected to the annular filter layer 221 of the rotary color filter wheel 22 by the first beam splitter 41 for filtering; if the blue laser beam converges to the blue laser reflection area 2124 of the annular fluorescent layer 212, the blue laser beam is reflected to the condensing lens 31 through the blue laser reflection area 2124, then converges to the first beam splitter 41 through the condensing lens 31, transmits to the blue laser reflection mirror 54 through the first beam splitter 41, and reflects to the first beam splitter 41 through the blue laser reflection mirror 54, and finally transmits to the annular filter layer 221 of the rotary color filter wheel 22 through the first beam splitter 41 for filtering; meanwhile, the red laser light source 12 emits a red laser beam, which is off-axis incident to the first beam splitter 41, transmitted to the condenser lens 31 through the first beam splitter 41, converged to the annular reflection diffusion layer 211 of the rotating fluorescent color wheel 21 through the condenser lens 31, diffused and reflected to the condenser lens 31 through the annular reflection diffusion layer 211 to change the direction of the red laser beam, converged to the red laser mirror 51 through the condenser lens 31, reflected to the first beam splitter 41 through the red laser mirror 51, and transmitted to the annular filter layer 221 of the rotating filtering color wheel 22 through the first beam splitter 41 for filtering.
The red light, the blue light and the green light with high color purity are obtained after the light is filtered by the annular filter layer 221, and the white light with high color gamut can be obtained after the obtained red light, the obtained blue light and the obtained green light are combined.
The beneficial effects of the embodiment of the invention are as follows: in contrast to the prior art, the embodiment of the present invention provides a projection light source and a projection system thereof, where the projection light source includes: the working surface of the rotary fluorescent color wheel is provided with an annular fluorescent layer and an annular reflection diffusion layer, and the annular fluorescent layer and the annular reflection diffusion layer are arranged adjacently; the blue laser light source, the red laser light source, the condenser lens, the first spectroscope and the red laser reflector are all arranged on one side of the working surface of the rotary fluorescent color wheel, the annular fluorescent layer, the condenser lens, the first spectroscope and the blue laser light source of the rotary fluorescent color wheel are positioned on a first datum line, the red laser reflector and the first spectroscope are positioned on a second datum line, and the red laser light source is arranged in an off-axis mode, so that a red laser beam emitted by the red laser light source and the first datum line form a first off-axis angle a. According to the embodiment, the red laser light source is added in the projection light source to replace a mode of filtering yellow light so as to improve the color purity of red light, the brightness of the projection light source can not be influenced while the color gamut of the projection light source is improved, and the brightness and the color gamut of the projection light source are ensured; meanwhile, the annular reflection diffusion layer is arranged in the projection light source, and the red laser light source is arranged in an off-axis mode, so that the red laser light source and the blue laser light source can be arranged on the same side, the space between the rotary fluorescent color wheel and the blue laser light source is reasonably utilized, the projection light source is compact in structure, and the size cannot be greatly increased due to the addition of the red laser light source.
EXAMPLE III
Please refer to fig. 7, which is a schematic structural diagram of a projection light source according to an embodiment of the present invention, where the projection light source 1 is applied to a projection system, the projection light source 1 is substantially the same as the projection light source described in the first embodiment, and the same contents can be referred to in the first embodiment, and further description is omitted here.
The difference is that the projection light source 1 according to the embodiment of the present invention includes: a blue laser light source 11, a red laser light source 12, a rotating fluorescent color wheel 21, a rotating filter color wheel 22, a condenser lens 31, a first beam splitter 41, and a red laser mirror 51.
Specifically, referring to fig. 9, the annular fluorescent layer 212 of the rotating fluorescent color wheel 21 includes a green fluorescent powder region 2121, a yellow fluorescent powder region 2122 and a blue laser reflection scattering region 2125, the green fluorescent powder region 2121, the yellow fluorescent powder region 2122 and the blue laser reflection scattering region 2125 are circumferentially disposed along the annular fluorescent layer 212, and the areas of the green fluorescent powder region 2121, the yellow fluorescent powder region 2122 and the blue laser reflection scattering region 2125 are the same.
Of course, in some embodiments, the areas of the green phosphor region 2121, the yellow phosphor region 2122 and the blue laser reflection scattering region 2125 may be set in unequal proportions according to actual needs.
When the blue laser beam is incident to the green phosphor region 2121 of the annular phosphor layer 212, the green phosphor region 2121 absorbs the blue laser beam and is stimulated to reflect green phosphor;
when the blue laser beam is incident to the yellow phosphor region 2122 of the annular phosphor layer 212, the yellow phosphor region 2122 absorbs the blue laser beam and is stimulated to reflect yellow phosphor;
when the blue laser beam is incident to the blue laser reflection scattering region 2125 of the annular fluorescent layer 212, the blue laser reflection scattering region 2125 scatters and reflects the blue laser beam to eliminate blue laser beam speckles and enlarge the reflection angle of the blue laser beam, so that the blue laser beam can be reflected to the first reflection section 411 and the second reflection section 412, the use of a reflector is reduced, the structure is more compact, and the volume of the projection light source is reduced to a certain extent.
The first beam splitter 41 includes a first reflective segment 411, a second reflective segment 412, and a transmissive segment 413, the transmissive segment 413 being disposed between the first reflective segment 411 and the second reflective segment 412. Wherein the first reflecting section 411 and the second reflecting section 412 are used for reflecting the blue laser beam, the yellow fluorescent light and the green fluorescent light; the transmissive section 413 is configured to transmit the blue laser beam and the red laser beam and reflect the yellow fluorescence and the green fluorescence, so that the length of the transmissive section 413 is not less than the spot diameter of the blue laser beam, so that the transmissive section 413 can completely transmit the blue laser beam, and the smaller the length of the transmissive section 413, the smaller the blue light loss.
Further, the blue laser light source 11, the red laser light source 12, the condenser lens 31, the first beam splitter 41, and the red laser reflector 51 are disposed on the working plane P1 side of the rotating fluorescent color wheel 21, and,
the annular fluorescent layer 212, the condenser lens 31, the first beam splitter 41 and the blue laser light source 11 of the rotating fluorescent color wheel 21 are sequentially located on a first reference line S1, that is, the central axes of the annular fluorescent layer 212, the condenser lens 31, the first beam splitter 41 and the blue laser light source 11 of the rotating fluorescent color wheel 21 coincide with the first reference line S1;
the red laser mirror 51, the first beam splitter mirror 41 and the annular filter layer 221 of the rotary filter color wheel 22 are sequentially located on a second reference line S2, that is, the central axes of the red laser mirror 51, the first beam splitter mirror 41 and the annular filter layer 221 of the rotary filter color wheel 22 coincide with the second reference line S2;
the red laser source 12 is disposed off-axis, so that the emitted red laser beam and the first reference line S1 form a first off-axis angle a, which satisfies the formula
Where d is the distance from the central loop line of the annular reflection/diffusion layer 211 to the first reference line S1, and f is the focal length of the condenser lens 31. The red laser light source 12 is arranged in an off-axis mode, the annular reflection diffusion layer 211 is arranged, and red laser beams emitted by the red laser light source 12 are reflected, so that the red laser light source and the blue laser light source can be arranged on the same side, the space between the rotary fluorescent color wheel and the blue laser light source is reasonably utilized, the structure of the projection light source is more compact, and the size of the projection light source cannot be greatly increased due to the addition of the red laser light source.
The first reference line S1 and the second reference line S2 are located in the same plane and are perpendicular to each other.
Specifically, the first beam splitter 41 is located between the working plane P1 of the rotating fluorescent color wheel 21 and the blue laser light source 11, the working plane P1 of the rotating fluorescent color wheel 21 is perpendicular to the first reference line S1, the blue laser light beam emitted by the blue laser light source 11 coincides with the first reference line S1, the first beam splitter 41 forms an angle of 45 ° with the first reference line S1, such that the first surface P3 of the first beam splitter 41 faces the working plane P1 of the rotating fluorescent color wheel 21, the first surface P3 also faces the working plane P2 of the rotating filter color wheel 22, the second surface P4 faces the blue laser light source 11, and the second surface P4 also faces the red laser reflector 51, the transmission section 413 of the first beam splitter 41 is used for transmitting the blue laser light beam emitted by the blue laser light source 11 to the annular fluorescent layer 212 of the rotating fluorescent color wheel 21, and the first reflection section 411, the second reflection section 412 and the transmission section 413 reflect the green fluorescent powder and yellow fluorescent layer 2121 of the annular fluorescent layer 212 of the annular fluorescent powder region 212 The yellow fluorescent light reflected from the powder region 2122 is reflected to the ring filter layer 221 of the rotating filter color wheel 22; the first reflecting section 411 and the second reflecting section 412 reflect the blue laser beam scattered and reflected by the blue laser reflection scattering region 2125 of the annular fluorescent layer 212 to the annular filter layer 221 of the rotary color filter wheel 22; the first beam splitter 41 is also used for transmitting the red laser beam diffused and reflected by the annular reflection diffusion layer 211 and the red laser beam reflected by the red laser reflection unit 51;
the condenser lens 31 is located between the working plane P1 of the rotating fluorescent color wheel 21 and the first surface P3 of the first beam splitter 41, is perpendicular to the first reference line S1, and is configured to condense the light beam incident on the working plane P1 of the rotating fluorescent color wheel 21 and the light beam emitted from the working plane P1 of the rotating fluorescent color wheel 21, so that each light beam can be accurately condensed to a target position;
the reflecting surface of the red laser reflector 51 faces the second surface P4 of the first beam splitter 41 (the first beam splitter 41 is far away from the rotating fluorescent color wheel 21), and the normal of the red laser reflector 51 forms an included angle b with the second reference line S2, wherein the included angle b satisfies the formula
The red laser beam is used for reflecting the red laser beam transmitted by the first beam splitter 41 to the first beam splitter 41, and is transmitted to the annular filter layer 221 of the rotary filtering color wheel 22 through the first beam splitter 41 for filtering;
the red laser source 12 is located on a side far from the reflection surface of the red laser reflector 51, and forms a first off-axis angle a with the first reference line S1, so that the red laser source can reasonably utilize space, has a compact structure, and does not greatly increase the volume of the projection light source even if the volume of the projection light source of the red laser source is increased.
According to the embodiment of the invention, the use of the reflector is reduced, the volume of the projection light source is reduced to a certain extent, and meanwhile, the structure is more compact by concentrating the optical elements on one side.
In summary, it can be understood that, referring to fig. 8, the blue laser light source 11 emits a blue laser light beam, the blue laser light beam transmits to the condensing lens 31 through the transmission section 413 of the first beam splitter 41, and then is converged to the annular fluorescent layer 212 of the rotating fluorescent color wheel 21 through the condensing lens 31, if the blue laser light beam is converged to the green fluorescent powder region 2121 of the annular fluorescent layer 212, the green fluorescent light beam is absorbed by the green fluorescent powder region 2121 and reflected to a green fluorescent light, the green fluorescent light beam is reflected to the condensing lens 31 and converged to the first beam splitter 41 through the condensing lens 31, and then is reflected to the annular filter layer 221 of the rotating color wheel filter 22 through the first beam splitter 41 for filtering; if the blue laser beam converges to the yellow phosphor region 2122 of the annular phosphor layer 212, the blue laser beam is absorbed by the yellow phosphor region 2122 and reflects yellow phosphor, and the yellow phosphor is reflected to the condenser lens 31 and converged to the first beam splitter 41 by the condenser lens 31, and then reflected to the annular filter layer 221 of the rotary color filter wheel 22 by the first beam splitter 41 for filtering; if the blue laser beam converges on the blue laser reflection scattering region 2125 of the annular fluorescent layer 212, the blue laser reflection scattering region 2125 scatters and reflects the blue laser beam to the first reflection segment 411 and the second reflection segment 412 of the first beam splitter 41, and reflects the blue laser beam to the annular filter layer 221 of the rotary filter color wheel 22 for filtering, so as to reduce the loss of the blue laser beam from the transmission segment 413, at this time, the smaller the length of the transmission segment 413 is, the smaller the loss of the blue laser beam is; meanwhile, the red laser light source 12 emits a red laser beam, which is off-axis incident to the condenser lens 31, converged to the annular reflection diffusion layer 211 of the rotating fluorescent color wheel 21 via the condenser lens 31, then diffused and reflected to the condenser lens 31 via the annular reflection diffusion layer 211 to change the direction of the red laser beam, converged to the red laser reflector 51 via the condenser lens 31, reflected to the first beam splitter 41 via the red laser reflector 51, transmitted to the second beam splitter 42 via the first beam splitter 41, and transmitted to the annular filter layer 221 of the rotating filtering color wheel 22 via the second beam splitter 42 for filtering.
The red light, the blue light and the green light with high color purity are obtained after the light is filtered by the annular filter layer 221, and the white light with high color gamut can be obtained after the obtained red light, the obtained blue light and the obtained green light are combined.
The beneficial effects of the embodiment of the invention are as follows: in contrast to the prior art, the embodiment of the present invention provides a projection light source and a projection system thereof, where the projection light source includes: the working surface of the rotary fluorescent color wheel is provided with an annular fluorescent layer and an annular reflection diffusion layer, and the annular fluorescent layer and the annular reflection diffusion layer are arranged adjacently; the blue laser light source, the red laser light source, the condenser lens, the first spectroscope and the red laser reflector are all arranged on one side of the working surface of the rotary fluorescent color wheel, the annular fluorescent layer, the condenser lens, the first spectroscope and the blue laser light source of the rotary fluorescent color wheel are positioned on a first datum line, the red laser reflector and the first spectroscope are positioned on a second datum line, and the red laser light source is arranged in an off-axis mode, so that a red laser beam emitted by the red laser light source and the first datum line form a first off-axis angle a. According to the embodiment, the red laser light source is added in the projection light source to replace a mode of filtering yellow light so as to improve the color purity of red light, the brightness of the projection light source can not be influenced while the color gamut of the projection light source is improved, and the brightness and the color gamut of the projection light source are ensured; meanwhile, the annular reflection diffusion layer is arranged in the projection light source, and the red laser light source is arranged in an off-axis mode, so that the red laser light source and the blue laser light source can be arranged on the same side, the space between the rotary fluorescent color wheel and the blue laser light source is reasonably utilized, the projection light source is compact in structure, and the size cannot be greatly increased due to the addition of the red laser light source.
Example four
The embodiment of the present invention further provides a projection system, which includes the projection light source 1, the display chip and the projection lens described in the above embodiment.
In some embodiments, the projection system further comprises a housing, a square or fly-eye lens, a set of prisms, or a set of free-form surface lenses. The projection light source 1, the shell, the square rod or the fly-eye lens, the prism group or the free-form surface lens group and the display chip are arranged in the accommodating cavity of the shell; the shell is also provided with an opening, the accommodating cavity of the shell is communicated with the outer space of the shell through the opening, and the projection lens is arranged in the opening.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (11)
1. A projection light source, comprising:
a blue laser light source (11), a red laser light source (12), a rotating fluorescent color wheel (21), a condenser lens (31), a first beam splitter (41) and a red laser reflector (51);
the working surface of the rotating fluorescent color wheel (21) is provided with an annular fluorescent layer (212) and an annular reflection diffusion layer (211), the annular fluorescent layer (212) and the annular reflection diffusion layer (211) are adjacently arranged, and the inner diameter of the annular reflection diffusion layer (211) is consistent with the outer diameter of the annular fluorescent layer (212);
the blue laser light source (11), the red laser light source (12), the condenser lens (31), the first spectroscope (41) and the red laser reflector (51) are all arranged on one side of the working surface of the rotating fluorescent color wheel (21),
the annular fluorescent layer (212) of the rotating fluorescent color wheel (21), the condenser lens (31), the first beam splitter (41) and the blue laser light source (11) are positioned on a first reference line (S1),
the red laser reflector (51) and the first beam splitter (41) are positioned on a second reference line (S2),
the red laser light source (12) is disposed off-axis such that a red laser beam emitted from the red laser light source (12) forms a first off-axis angle a with the first reference line (S1).
2. The projection light source of claim 1,
the first reference line (S1) and the second reference line (S2) are perpendicular to each other;
the first off-axis angle a satisfies the formula
Wherein d is a distance from a central loop line of the annular reflection diffusion layer to the first reference line (S1), and f is a focal length of the condenser lens.
3. The projection light source of claim 2,
the included angle between the first spectroscope (41) and the first reference line (S1) is 45 degrees;
the red laser reflector (51) is arranged on one side, away from the rotating fluorescent color wheel (21), of the first light splitter (41);
the included angle b between the normal of the red laser reflector (51) and the second reference line (S2) satisfies the formula
4. The projection light source of claim 3,
the annular fluorescent layer (212) comprises: a blue laser transmission region (2123), a yellow phosphor region (2122), and a green phosphor region (2121);
the projection light source (1) further comprises: a first reflector (52), a second reflector (53) and a second beam splitter (42);
the second beam splitter (42) is arranged on one side of the working surface of the rotating fluorescent color wheel (21),
the first mirror (52) and the second mirror (53) are arranged on the other side of the working surface of the rotating fluorescent color wheel (21) and,
the first reflector (52), the annular fluorescent layer (212) of the rotating fluorescent color wheel (21), the condenser lens (31), the first beam splitter (41), and the blue laser light source (11) are positioned on a first reference line (S1),
the red laser reflector (51), the first beam splitter (41) and the second beam splitter (42) are positioned on a second reference line (S2),
the second beam splitter (42) and the second reflector (53) are located on a third reference line (S3),
the second reflecting mirror (53) and the first reflecting mirror (52) are located on a fourth reference line (S4).
5. The projection light source of claim 4,
the first reference line (S1), the second reference line (S2), the third reference line (S3) and the fourth reference line (S4) are rectangular;
the second reflecting mirror (53) and the second beam splitter (42) are parallel to the first beam splitter (41), and the second reflecting mirror (53), the first beam splitter (41), and the second beam splitter (42) are perpendicular to the first reflecting mirror (52).
6. The projection light source of claim 3,
the annular fluorescent layer (212) comprises: a blue laser reflection region (2124), a yellow phosphor region (2122) and a green phosphor region (2121);
the projection light source (1) further comprises: a blue laser mirror (54);
the blue laser light source (11) is disposed off-axis such that the blue laser beam emitted from the blue laser light source (11) forms a second off-axis angle c with the first reference line (S1).
7. The projection light source of claim 6,
the second off-axis angle c satisfies the formula
Wherein d is2Is a distance from a borderline of the annular fluorescent layer to the first reference line (S1), and f is a focal length of the condenser lens.
8. The projection light source of claim 3,
the annular fluorescent layer (212) comprises: a blue laser reflection scattering area (2125), a yellow phosphor area (2122) and a green phosphor area (2121);
the first spectroscope (41) includes: a first reflective segment (411), a second reflective segment (412), and a transmissive segment (413);
the transmissive section (413) is disposed between the first reflective section (411) and the second reflective section (412);
the transmissive section (413) is for transmitting blue and red light and reflecting other color light beams.
9. The projection light source of claim 8, wherein the length of the transmissive section (413) is not less than the blue spot diameter, and the smaller the length of the transmissive section (413), the smaller the blue light loss.
10. The projection light source according to any of claims 1-9, characterized in that the projection light source (1) further comprises:
a rotating filter color wheel (22);
an annular filter layer (221) is arranged on the working surface of the rotary filtering color wheel (22), and the annular filter layer (221) of the rotary filtering color wheel (22) is located on the second reference line (S2).
11. A projection system, comprising: a display chip, a projection lens and a projection light source according to any one of claims 1 to 10.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810245714.7A CN108663881B (en) | 2018-03-23 | 2018-03-23 | Projection light source and projection system thereof |
| PCT/CN2019/070264 WO2019179209A1 (en) | 2018-03-23 | 2019-01-03 | Projection light source and projection system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810245714.7A CN108663881B (en) | 2018-03-23 | 2018-03-23 | Projection light source and projection system thereof |
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| Publication Number | Publication Date |
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| CN108663881A CN108663881A (en) | 2018-10-16 |
| CN108663881B true CN108663881B (en) | 2020-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810245714.7A Expired - Fee Related CN108663881B (en) | 2018-03-23 | 2018-03-23 | Projection light source and projection system thereof |
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| Country | Link |
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| CN (1) | CN108663881B (en) |
| WO (1) | WO2019179209A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108663881B (en) * | 2018-03-23 | 2020-06-02 | 广景视睿科技（深圳）有限公司 | Projection light source and projection system thereof |
| CN111258160B (en) * | 2018-11-30 | 2022-07-08 | 青岛海信激光显示股份有限公司 | Laser fluorescence projection system, method and device, electronic device and storage medium |
| CN109672816B (en) * | 2019-01-04 | 2021-03-09 | 多普光电科技有限公司 | Matrix image acquisition system and matrix image projection system |
| CN112015036A (en) * | 2019-05-30 | 2020-12-01 | 台达电子工业股份有限公司 | Light source system |
| CN112087609A (en) * | 2019-06-12 | 2020-12-15 | 扬明光学股份有限公司 | Projection device and manufacturing method thereof |
| CN110568706A (en) * | 2019-08-22 | 2019-12-13 | 苏州佳世达光电有限公司 | Projector with a light source |
| CN116430662B (en) * | 2023-06-13 | 2023-08-15 | 宜宾市极米光电有限公司 | Light source system and projection equipment |
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| JP2005025107A (en) * | 2003-07-02 | 2005-01-27 | Nec Viewtechnology Ltd | Projector |
| JP2012032451A (en) * | 2010-07-28 | 2012-02-16 | Funai Electric Co Ltd | Optical device for projector |
| CN104765240A (en) * | 2014-01-03 | 2015-07-08 | 深圳市亿思达科技集团有限公司 | Dual laser light source system |
| CN206610072U (en) * | 2017-03-14 | 2017-11-03 | 深圳市光峰光电技术有限公司 | Light supply apparatus and optical projection system |
| CN207067642U (en) * | 2017-05-26 | 2018-03-02 | 深圳市光峰光电技术有限公司 | Light-source system and projector equipment |
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| JP5311155B2 (en) * | 2010-12-14 | 2013-10-09 | カシオ計算機株式会社 | Light source device and projector |
| KR101834809B1 (en) * | 2011-03-09 | 2018-03-06 | 엘지전자 주식회사 | Light source apparatus and method for manufacturing the same |
| TW201441665A (en) * | 2013-04-16 | 2014-11-01 | Hon Hai Prec Ind Co Ltd | Laser projection device |
| CN104765238B (en) * | 2014-01-03 | 2018-09-25 | 深圳市亿思达科技集团有限公司 | A kind of double laser light source system |
| CN107797372A (en) * | 2017-11-17 | 2018-03-13 | 四川长虹电器股份有限公司 | A kind of two-color laser light source optical automotive engine system |
| CN108663881B (en) * | 2018-03-23 | 2020-06-02 | 广景视睿科技（深圳）有限公司 | Projection light source and projection system thereof |
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2018
- 2018-03-23 CN CN201810245714.7A patent/CN108663881B/en not_active Expired - Fee Related
-
2019
- 2019-01-03 WO PCT/CN2019/070264 patent/WO2019179209A1/en active Application Filing
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| JP2005025107A (en) * | 2003-07-02 | 2005-01-27 | Nec Viewtechnology Ltd | Projector |
| JP2012032451A (en) * | 2010-07-28 | 2012-02-16 | Funai Electric Co Ltd | Optical device for projector |
| CN104765240A (en) * | 2014-01-03 | 2015-07-08 | 深圳市亿思达科技集团有限公司 | Dual laser light source system |
| CN206610072U (en) * | 2017-03-14 | 2017-11-03 | 深圳市光峰光电技术有限公司 | Light supply apparatus and optical projection system |
| CN207067642U (en) * | 2017-05-26 | 2018-03-02 | 深圳市光峰光电技术有限公司 | Light-source system and projector equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108663881A (en) | 2018-10-16 |
| WO2019179209A1 (en) | 2019-09-26 |
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