CN107422595A - Laser projection - Google Patents
Laser projection Download PDFInfo
- Publication number
- CN107422595A CN107422595A CN201710575923.3A CN201710575923A CN107422595A CN 107422595 A CN107422595 A CN 107422595A CN 201710575923 A CN201710575923 A CN 201710575923A CN 107422595 A CN107422595 A CN 107422595A
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- China
- Prior art keywords
- laser
- light beam
- polarization
- circularly polarized
- projection
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Classifications
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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
- G03B21/2073—Polarisers in the lamp house
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
-
- 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
-
- 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
Abstract
A kind of laser projection of the present invention, can lift the selectivity of the laser diode as LASER Light Source, include LASER Light Source, diffusion sheet, polarization spectroscope, quarter-wave plate and phosphor powder colour wheel.LASER Light Source produces the laser beam advanced along the first optical path；Diffusion sheet is spreading the laser beam to produce diffusion light beam；Polarization spectroscope is to reflect the diffusion light beam, and to produce the reflected beams advanced along the second optical path, the wherein diffusion light beam is more than 45 degree and less than or equal to 50 degree relative to the incidence angle of the polarization spectroscope；Quarter-wave plate is on second optical path, the reflected beams are converted into the first circularly polarized light beam；Phosphor powder colour wheel is to receive first circularly polarized light beam, to produce the second circularly polarized light beam of inverse second optical path and be excited light beam；The quarter-wave plate also second circularly polarized light beam is converted into P polarization light beam, and the polarization spectroscope allow the P polarization light beam and this be excited light beam and penetrate.
Description
Technical field
The present invention is related to a kind of laser projection, espespecially a kind of polarization spectro formula laser projection.
Background technology
Laser projection be by the use of laser diode (Laser Diode) as excitation source come make phosphor powder send it is yellow,
The light of the different wave length such as red, green or blue, is used using the light source as projector.Current existing laser projection can generally divide
For reflective laser projector and the major class of polarization spectro formula laser projection two, regardless of whether being reflective laser projector or partially
Beam splitting type laser projector of shaking is beaten on phosphor powder colour wheel by by laser beam light source mostly, so that the firefly on phosphor powder colour wheel
Light powder produces fluorescent after being stimulated.However, because the energy density of laser beam is too high, therefore easily cause phosphor powder colour wheel to occur
Hot-quenching is gone out the phenomenon of (thermal quenching), cause the launching efficiency of phosphor powder colour wheel with the raising of laser power and
Rapidly decline, in some instances it may even be possible to burn out phosphor powder colour wheel because excessively being concentrated the energy of laser beam.
On the other hand, in polarization spectro formula laser projection, polarization spectroscope (dichroic is mainly utilized
Filter closing light) is carried out.However, because polarization spectroscope is little for the wavelength permissible range of S-polarization light and P polarization light, therefore
Laser diode as the light source of laser projection must meet the laser two of the optical characteristics of polarization spectroscope from wavelength
Pole pipe.It refer to Fig. 1, Fig. 1 is illustrating the optical characteristics of polarization spectroscope.Wherein, curve 110 is representing polarization spectroscope
For the optical characteristics of P polarization light, curve 120 is to represent optical characteristics of the polarization spectroscope for S-polarization light, and curve
130 representing the Wavelength distribution of its laser beam sent of the laser diode in laser projection.Can by curve 130
Know, the wavelength of laser beam is about near 460nm.When laser beam is S-polarization light, because laser beam is to polarization spectroscope
Penetrance be no better than 0%, therefore polarization spectroscope can reflection laser light beam.When laser beam is P polarization light, because of laser light
Beam is no better than 100% to the penetrance of polarization spectroscope, therefore laser beam can penetrate polarization spectroscope.Wherein, curve 110 with
Spectrum gap (spectral gap) of the wavelength difference away from referred to as polarization spectroscope between curve 120, and when spectrum gap is not wide enough,
The selectivity of the laser diode as LASER Light Source can be limited during laser projection is manufactured.Furthermore due to laser two
There is about ± 5nm wavelength tolerance between pole pipe, if therefore the wavelength of some laser diodes in laser projection light source is inclined
If difference is larger, it will cause the closing light deterioration of efficiency of projector, and then influence the brightness of projector.
The content of the invention
Present invention aims at a kind of laser projection is provided, the spectrum gap of polarization spectroscope can be expanded, and then lifted and used
It is used as the selectivity of the laser diode of LASER Light Source.
To reach above-mentioned purpose, a kind of laser projection of the present invention includes LASER Light Source, diffusion sheet, polarization spectroscope, four
/ mono- wave plate and phosphor powder colour wheel.LASER Light Source to produce along the first optical path advance laser beam；Diffusion sheet, located at this
On first optical path, to spread the laser beam to produce diffusion light beam；Polarization spectroscope, to reflect the diffusion light beam, with
The reflected beams advanced along the second optical path are produced, the wherein diffusion light beam is more than 45 degree relative to the incidence angle of the polarization spectroscope
And less than or equal to 50 degree；Quarter-wave plate, it is inclined the reflected beams are converted into the first circle on second optical path
Shake light beam；Phosphor powder colour wheel, to receive first circularly polarized light beam, to produce the second circularly polarized light beam of inverse second optical path
And it is excited light beam；Wherein the quarter-wave plate by second circularly polarized light beam also to be converted into P polarization light beam, and the polarization
Spectroscope allow the P polarization light beam and this be excited light beam and penetrate.
Preferably, the phosphor powder colour wheel includes reflecting layer and phosphor powder applying area.Reflecting layer is inclined to reflect first circle
The light beam that shakes is second circularly polarized light beam；Phosphor powder applying area is arranged on the reflecting layer, to by first circularly polarized light beam
Excite and produce this and be excited light beam.
Preferably, the LASER Light Source includes multiple laser diodes, each laser diode to produce laser beam, and
Multiple laser beams form the laser beam caused by those laser diodes after being accumulated.
Preferably, the laser projection also includes lens, and the LASER Light Source also includes multiple speculums, the plurality of speculum
Corresponding the plurality of laser diode is set, and the plurality of laser diode includes multiple first laser diodes and multiple second lasers
Diode, laser beam caused by each first laser diode reflex to the lens via corresponding speculum, and every 1
For laser beam caused by dual-laser diode via the gap directive lens by the plurality of speculum, it is more that the lens converge this
Laser beam caused by individual first laser diode and the plurality of second laser diode is to form the laser beam.
Preferably, the laser beam is blue laser beams.
Preferably, also comprising the first lens group, between the LASER Light Source and the diffusion sheet, to collimate and reduce this
Laser beam is to the diffusion sheet.
Preferably, also comprising the second lens group, between the quarter-wave plate and the phosphor powder colour wheel, to should
First circularly polarized light beam converges to the phosphor powder colour wheel.
Preferably, also comprising condenser lens and light pipe, wherein the condenser lens located at the polarization spectroscope and the light pipe it
Between, and to by the P polarization light beam and the stimulated light beam convergence to the light pipe.
Preferably, the laser beam is S-polarization light beam.
Preferably, also comprising driving light source, to drive the phosphor powder colour wheel to rotate.
Compared with prior art, laser projection in embodiments of the present invention, by making diffusion light beam relative to inclined
Spectroscopical incidence angle of shaking is more than 45 degree and less than or equal to 50 degree, can expand the spectrum gap (spectral of polarization spectroscope
Gap), and then lifting is used as the selectivity of the laser diode of LASER Light Source.
More preferably understand to have to the above-mentioned and other aspect of the present invention, preferred embodiment cited below particularly, and coordinate institute
Accompanying drawings, it is described in detail below：
Brief description of the drawings
Fig. 1 is illustrating the optical characteristics of polarization spectroscope.
Fig. 2 is the schematic diagram of the laser projection of one embodiment of the invention.
Fig. 3 is the schematic diagram of the phosphor powder colour wheel of one embodiment of the invention.
Fig. 4 is to illustrate the definition of the half width at half-maximum(HWHM of diffusion sheet and measure mode.
Fig. 5 is the energy profile of luminous point in Fig. 4.
Fig. 6 is the graph of a relation between the mist degree and half width at half-maximum(HWHM of the diffusion sheet used in Fig. 2.
Fig. 7 is a form, to illustrate the corresponding half width at half-maximum(HWHM of the mist degree of the diffusion sheet used in Fig. 2.
Fig. 8 be diffusion sheet half width at half-maximum(HWHM and laser beam polarization state ratio graph of a relation.
Fig. 9 be diffusion sheet half width at half-maximum(HWHM and laser projection projection brightness export ratio graph of a relation.
Figure 10 is the structural representation of the LASER Light Source of the embodiment of the present invention.
Figure 11 is the graph of a relation of the penetrance of incidence angle θ and polarization spectroscope in the embodiment of the present invention.
Figure 12 is the graph of a relation of the closing light efficiency of incidence angle θ and laser projection in the embodiment of the present invention.
Figure 13 is a form, to illustrate the spectrum gap of the polarization spectroscope corresponding to different incidence angle θs and laser
The closing light efficiency of projector.
Embodiment
Fig. 2 is refer to, Fig. 2 is the schematic diagram of the laser projection 200 of one embodiment of the invention.Laser projection 200 wraps
Containing LASER Light Source 210, diffusion sheet 230, polarization spectroscope (dichroic filter) 240, quarter-wave plate (quarter-
Wave plate) 242 and phosphor powder colour wheel (phosphor wheel) 250.Wherein, LASER Light Source 210 is producing along first
The laser beam S1 that optical path L1 advances, and in the present embodiment, laser beam S1 is S-polarization (S-polarized) light beam.This
Outside, diffusion sheet 230 spreads light beam S2 to spread laser beam S1 on the first optical path L1 to produce.The master of diffusion sheet 230
Want function to be to reduce or even eliminate phosphor powder colour wheel 250 hot-quenching occurs to go out the probability of (thermal quenching) phenomenon, and
This part will further illustrate in paragraph later.Polarization spectroscope 240 then spreads light beam S2 (S-polarization) to reflect, with
The reflected beams R2 to be advanced along the second optical path L2 is produced, and the reflected beams R2 also can be S-polarization.In addition, quarter-wave plate 242
On the second optical path L2, the reflected beams R2 is converted into the first circular polarization (circular polarized) light beam C1.
Phosphor powder colour wheel 250 can receive the first circularly polarized light beam C1, and thus produce inverse second optical path L2 illuminating bundle M, wherein according to
Mingguang City beam M includes the second circularly polarized light beam C2 and stimulated light P0.Fig. 3 is refer to, Fig. 3 is the phosphor powder colour wheel 250 in Fig. 2
Schematic diagram.Phosphor powder colour wheel 250 has reflecting layer 251 and the phosphor powder applying area 252 being arranged on reflecting layer 251 (with oblique
Line represents).Wherein, reflecting layer 251 can be a metal level, and phosphor powder applying area 252 is coated with phosphor powder.Phosphor powder applies
The ratio that cloth area 252 accounts for whole reflecting layer 251 can adjust by angle π.Reflecting layer 251 can reflect the first circularly polarized light beam C1
Second circularly polarized light beam C2, and phosphor powder applying area 252 produces stimulated light P0 to be excited by the first circularly polarized light beam C1
(i.e. fluorescent).Wherein, stimulated light P0 is non-polarized light.Refer again to Fig. 2, when illuminating bundle M (the second circularly polarized light beam C2 with by
Laser P0) when penetrating quarter-wave plate 242 with inverse second optical path L2 direction, the second circularly polarized light beam C2 can be by a quarter
Wave plate 242 is converted into P polarization (P-polarized) light beam P1.In addition.Polarization spectroscope 240 allows P polarization light beam P1 and is excited
Light P0 is penetrated.Wherein, can be to reflect diffusion light beam S2 because polarization spectroscope 240 has above-mentioned optical characteristics, and permit
Perhaps P polarization light beam P1 and stimulated light P0 is penetrated, therefore is advantageous to the downsizing of the volume of laser projection 200.
In order to reduce or even eliminate the probability that hot quenching phenomenon occurs for phosphor powder colour wheel 250, laser projection 200 can be by
The effect of diffusion sheet 230 and cause diffusion light beam S2 relative to laser beam S1 half width at half-maximum(HWHM (Half Width At
Half-Maximum；HWHM) it is more than or equal to 1.5 degree and less than or equal to 3 degree.It refer to Fig. 4 and Fig. 5.Fig. 4 is to illustrate to spread
The definition of the half width at half-maximum(HWHM (HWHM) of piece 230 and measurement mode, and Fig. 5 is then the energy profile of luminous point 420 in Fig. 4.When
When laser beam S1 is by diffusion sheet 230 caused by LASER Light Source 210, diffusion light beam 410 can be produced.When diffusion light beam 410
When being radiated on area of illumination 430, luminous point 420 can be produced on area of illumination 430.Wherein, spread in geometry of the light beam 410 in figure
Angle between heart line 412 and the edge for spreading light beam 410 is α.Fig. 5 curve 500 represents the diffusion angle and energy of luminous point 420
Relation between amount distribution ratio, wherein transverse axis represent the diffusion angle of diffusion light beam 410.Diffusion angle is relative equal to 0 part
In the point that geometric center lines 412 intersect with area of illumination 430, and the Energy distribution ratio corresponding to this joining is defined as 100%.With
It is bigger the diffusion angle of diffusion light beam 410, corresponding Energy distribution is lower than.When Energy distribution ratio is 50% (
A points in corresponding diagram 5 and B points), A points to diffusion angle corresponding between B points is defined as full half width at half-maximum (HWHM) (Full in Fig. 5
Width At Half-Maximum；FWHM) F1, and full half width at half-maximum (HWHM) F1 half is half width at half-maximum(HWHM (HWHM) H1.Many institutes
It is known, mist degree (Haze) and the substantially positive correlation of half width at half-maximum(HWHM category of diffusion sheet.In an embodiment of the present invention, with half width at half maximum
Spend it is equivalent represent mist degree, and the relation between the mist degree and half width at half-maximum(HWHM of diffusion sheet 230 is as shown in FIG. 6 and 7.Diffusion sheet
230 half width at half-maximum(HWHM H1 can be more than or equal to 1.5 degree and be less than or equal to 3 degree so that light shine phosphor powder colour wheel 250 will not mistake
In concentration, and then reduce and even eliminate the probability that hot quenching phenomenon occurs for phosphor powder colour wheel 250.
In addition, because the mist degree of diffusion sheet 230 influences whether laser beam S1 polarization state ratio and laser projection 200
Projection brightness export ratio, and laser beam S1 polarization state ratio influences whether the closing light efficiency of projector 20, therefore to keep away
Exempt to have influence on the Normal appearances of laser projection 200 because selecting inappropriate diffusion sheet 230, need to select has suitable half-peak
The diffusion sheet 230 of half width.Further to understand the half width at half-maximum(HWHM of diffusion sheet 230 for caused by LASER Light Source 210
The influence of laser beam S1 polarization state ratio and projection brightness export ratio for laser projection 200, refer to Fig. 8
And Fig. 9.Fig. 8 is the graph of a relation of half width at half-maximum(HWHM and the laser beam S1 of diffusion sheet 230 polarization state ratio, and Fig. 9 is spreads
The half width at half-maximum(HWHM of piece 230 and the graph of a relation of the projection brightness export ratio of laser projection 200.As seen from Figure 8, laser light
Beam S1 polarization state is reduced than regular meeting with the half width at half-maximum(HWHM increase of diffusion sheet 230, therefore the half width at half-maximum(HWHM of diffusion sheet 230
Can not be too high, in order to avoid highly impact laser beam S1 polarization state ratio and the closing light efficiency of projector 20.In addition, by scheming
9 can be seen that, when the half width at half-maximum(HWHM H1 of diffusion sheet 230 is between 2 degree to 3 degree, laser projection 200 has maximum
Projection brightness export ratio, and when the half width at half-maximum(HWHM H1 of diffusion sheet 230 is between 1.5 degree to 3 degree, laser projection
The 200 projection brightness export ratios having can also meet the demand used up to more than 95%.Therefore, in comprehensive consideration laser
After light beam S1 polarization state ratio and the projection brightness export ratio of laser projection 200, from its half width at half-maximum(HWHM H1
It is preferably to select for the diffusion sheet 230 more than or equal to 1.5 degree and less than or equal to 3 degree.
In an embodiment of the present invention, LASER Light Source 210 can have multiple laser diodes.It refer to Figure 10, Tu10Wei
The structural representation of the LASER Light Source 210 of one embodiment of the invention.In this embodiment, LASER Light Source 210 has multiple sharp
Optical diode 312, multiple laser diodes 314 and multiple speculums 318.Laser diode 312 and 314 produces laser and penetrated respectively
Line 315, and laser beam 315 caused by each laser diode 314 can reflex to lens via corresponding speculum 318
2210.Laser beam 315 produced by laser diode 312 can be by the gap on the side of speculum 318 and directive lens 2210.Lens
2210 can converge laser diode 312 and 314 produced by laser beam 315 and form laser beam S1.By such setting,
The big many of brightness of light beam caused by the more single laser diode of brightness meeting of laser beam S1 caused by LASER Light Source 210
Times.In addition, by the setting of speculum 318, the number of the laser diode of the unit area of LASER Light Source 210 can be reduced, and
Help to radiate.It should be noted that in the present embodiment, the position of the lens 2210 can be located at outside the LASER Light Source 210,
Also it can be integrated within the LASER Light Source 210, to perform the function of its convergence, can reach above-mentioned effect.
In an embodiment of the present invention, LASER Light Source 210 uses blue light laser diode, therefore laser beam S1 swashs for blue light
Light light beam.It is to be understood that ultraviolet or near ultraviolet LASER Light Source can be also used, to produce ultraviolet or near ultraviolet laser beam.
It refer again to Fig. 2.In an embodiment of the present invention, laser projection 200 can additionally comprise the first lens group 220, the
One lens group 220 is located between LASER Light Source 210 and diffusion sheet 230, to collimate and reduce laser beam S1 to diffusion sheet
230.Wherein, the first lens group 220 can include lens 221 and lens 222.It should be noted that in the present embodiment lens 221 with
Lens 2210 in Figure 10 can be identity element, and the first lens are set between LASER Light Source 210 and diffusion sheet 230 that is, working as
During group 220, the lens 2210 in Figure 10 can also omit, and hold depending on design requirement, certainly, both can also exist simultaneously.
In an embodiment of the present invention, laser projection 200 can additionally comprise the second lens group 270, and the second lens group 270 is set
Between quarter-wave plate 242 and phosphor powder colour wheel 250, the first circularly polarized light beam C1 is converged into phosphor powder colour wheel
250.Wherein, the second lens group 270 can include lens 271 and lens 272.
In an embodiment of the present invention, laser projection 200 can additionally comprise condenser lens 282 and light pipe (light rod)
280.Wherein, condenser lens 282 is located between polarization spectroscope 240 and light pipe 280, and polarization spectroscope 240 will be come from
P polarization light beam P1 and stimulated light P0 converge to light pipe 280.
In an embodiment of the present invention, laser projection 200 can additionally comprise driving module 260, to drive fluorescent pink colour
Wheel 250 rotates.
In addition, to expand the spectrum gap (spectral gap) of polarization spectroscope 240, with further improving laser light source
The optional scope of the wavelength of 210 laser diode, diffusion light beam S2 can be big relative to the incidence angle θ of polarization spectroscope 240
In 45 degree and less than or equal to 50 degree.Figure 11 is refer to, Figure 11 is incidence angle θ and polarization spectroscope in one embodiment of the invention
The graph of a relation of 240 penetrance.Wherein, curve P45, P48 and P50 is representing when incidence angle θ is respectively 45 degree, 48 degree and 50
When spending, P polarization light beam is (such as：P polarization light beam P1) for the penetrance of polarization spectroscope 240.In addition, curve S45, S48 and S50
To represent that S-polarization light is (such as when incidence angle θ is respectively 45 degree, 48 degree and 50 degree：Spread light beam S2) for polarization spectroscope
240 penetrance.Wherein, the wavelength spacing between curve P45 and curve S45 is the polarization spectro when incidence angle θ is 45 degree
The spectrum gap of mirror 240.Similarly, the wavelength spacing between curve P48 and curve S48 is the polarization point when incidence angle θ is 48 degree
The spectrum gap of light microscopic 240；And the wavelength spacing between curve P50 and curve S50 is the polarization point when incidence angle θ is 50 degree
The spectrum gap of light microscopic 240.As seen from Figure 11, when incidence angle θ is bigger, the spectrum gap of polarization spectroscope 240 can be bigger.When inclined
Shake spectroscope 240 spectrum gap it is bigger, the larger laser diode of wavelength tolerance can be covered as LASER Light Source, also improve laser
The selectivity of the laser diode of light source 210.
In addition, although the spectrum gap of polarization spectroscope 240 can be expanded by being adjusted by incidence angle θ, laser throwing can be influenceed
The closing light efficiency of shadow machine 200, therefore when adjusting incidence angle θ, the closing light efficiency of laser projection 200 need to be contemplated.It refer to figure
12, Figure 12 be incidence angle θ and the graph of a relation of the closing light efficiency of laser projection 200 in one embodiment of the invention.As shown in Figure 12,
When incidence angle is between 45 degree and 50 degree, the closing light efficiency of laser projection 200 can maintain more than 96%.Therefore, may be used
Incidence angle θ is set greater than 45 degree and less than or equal to 50 degree, you can maintain that there is enough conjunctions making laser projection 200
When light efficiency, expand the spectrum gap of polarization spectroscope 240.The spectrum gap of more detailed polarization spectroscope 240 and swash
The data of the closing light efficiency of light projector 200 then can refer to the form in Figure 13.
In summary, in laser projection in an embodiment of the present invention, can be dropped by using specific diffusion sheet
Low phosphor powder colour wheel occurs hot-quenching and gone out the probability of (thermal quenching) phenomenon.In addition, by make diffusion light beam relative to
The incidence angle of polarization spectroscope is more than 45 degree and less than or equal to 50 degree, can expand the spectrum gap (spectral of polarization spectroscope
Gap), and then lifting is used as the selectivity of the laser diode of LASER Light Source.
In summary, although the present invention is disclosed above with preferred embodiment, so it is not limited to the present invention.This hair
Bright those of ordinary skill in the art, without departing from the spirit and scope of the present invention, when various changes can be made
With retouching.Therefore, protection scope of the present invention is worked as and is defined depending on appended claims institute defender.
Claims (10)
1. a kind of laser projection, it is characterised in that include：
LASER Light Source, to produce the laser beam advanced along the first optical path；
Diffusion sheet, on first optical path, to spread the laser beam to produce diffusion light beam；
Polarization spectroscope, to reflect the diffusion light beam, to produce the reflected beams advanced along the second optical path, wherein the diffusion light
Beam is more than 45 degree and less than or equal to 50 degree relative to the incidence angle of the polarization spectroscope；
Quarter-wave plate, on second optical path, the reflected beams are converted into the first circularly polarized light beam；And
Phosphor powder colour wheel, to receive first circularly polarized light beam, with produce the second circularly polarized light beam of inverse second optical path and
It is excited light beam；
Wherein the quarter-wave plate by second circularly polarized light beam also to be converted into P polarization light beam, and the polarization spectroscope
Allow the P polarization light beam and this be excited light beam and penetrate.
2. laser projection as claimed in claim 1, it is characterised in that the phosphor powder colour wheel includes：
Reflecting layer, it is second circularly polarized light beam to reflect first circularly polarized light beam；And
Phosphor powder applying area, it is arranged on the reflecting layer, the stimulated light is produced to be excited by first circularly polarized light beam
Beam.
3. laser projection as claimed in claim 1, it is characterised in that the LASER Light Source includes multiple laser diodes, often
One laser diode is to produce laser beam, and multiple laser beams are formed after being accumulated caused by those laser diodes
The laser beam.
4. laser projection as claimed in claim 3, it is characterised in that the laser projection also includes lens, the laser light
Source also includes multiple speculums, and the plurality of speculum corresponds to the plurality of laser diode and set, and the plurality of laser diode includes
Multiple first laser diodes and multiple second laser diodes, laser beam caused by each first laser diode via
Corresponding speculum reflexes to the lens, laser beam caused by each second laser diode via the plurality of speculum by
The gap directive lens, the lens are converged caused by the plurality of first laser diode and the plurality of second laser diode
Laser beam is to form the laser beam.
5. laser projection as claimed in claim 1, it is characterised in that the laser beam is blue laser beams.
6. laser projection as claimed in claim 1, it is characterised in that also comprising the first lens group, located at the LASER Light Source
And between the diffusion sheet, to collimate and reduce the laser beam to the diffusion sheet.
7. laser projection as claimed in claim 1, it is characterised in that also comprising the second lens group, located at a quarter
Between wave plate and the phosphor powder colour wheel, first circularly polarized light beam is converged into the phosphor powder colour wheel.
8. laser projection as claimed in claim 1, it is characterised in that also comprising condenser lens and light pipe, the wherein focusing
Lens are located between the polarization spectroscope and the light pipe, and to by the P polarization light beam and the stimulated light beam convergence to the light pipe.
9. laser projection as claimed in claim 1, it is characterised in that the laser beam is S-polarization light beam.
10. laser projection as claimed in claim 1, it is characterised in that also comprising driving light source, to drive the phosphor powder
Colour wheel rotates.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710575923.3A CN107422595A (en) | 2017-07-14 | 2017-07-14 | Laser projection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710575923.3A CN107422595A (en) | 2017-07-14 | 2017-07-14 | Laser projection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019219516A (en) * | 2018-06-20 | 2019-12-26 | セイコーエプソン株式会社 | Light source device and projector |
| CN113109986A (en) * | 2020-01-10 | 2021-07-13 | 明基智能科技（上海）有限公司 | Projection device |
| CN114791688A (en) * | 2019-04-01 | 2022-07-26 | 青岛海信激光显示股份有限公司 | Laser light source and laser projection equipment |
Citations (5)
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| JP2019219516A (en) * | 2018-06-20 | 2019-12-26 | セイコーエプソン株式会社 | Light source device and projector |
| CN114791688A (en) * | 2019-04-01 | 2022-07-26 | 青岛海信激光显示股份有限公司 | Laser light source and laser projection equipment |
| CN113109986A (en) * | 2020-01-10 | 2021-07-13 | 明基智能科技（上海）有限公司 | Projection device |
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Application publication date: 20171201 |