CN104834171A - Laser light emitting device, light source and projection display system - Google Patents
Laser light emitting device, light source and projection display system Download PDFInfo
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- CN104834171A CN104834171A CN201510206940.0A CN201510206940A CN104834171A CN 104834171 A CN104834171 A CN 104834171A CN 201510206940 A CN201510206940 A CN 201510206940A CN 104834171 A CN104834171 A CN 104834171A
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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
- G03B21/208—Homogenising, shaping of the illumination light
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- 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
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
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- 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
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
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- 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
- G02B27/30—Collimators
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- 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
- G02B27/48—Laser speckle optics
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
The invention relates to a laser light emitting device, a light source and a projection display system. The laser light emitting device includes a plurality of lasers used for emitting a plurality of parallel laser beams, a focusing lens used for focusing the plurality of parallel laser beams, and a light scattering component located at the rear end of the light path of the focusing lens; the light scattering component is located at a light path position A, so that the diameter of a circumcircle of a region jointly formed by light spots on the light scattering component which are formed through irradiation of the plurality of laser beams is smaller than 1/5 of the diameter of a circumcircle of a region jointly formed by light spots on the section of the plurality of parallel laser beams; and the scattering angle of the light scattering component is not smaller than 2/3 of a maximum included angle of adjacent laser beams after focusing. Compared with the prior art, outgoing beams of the laser light emitting device of the invention are collimating with light spots uniformly distributed, and therefore, optical extension quantity is smaller; and the outgoing beams can be overlapped with each other without a long light path required, and therefore, a required space is small.
Description
Technical field
The present invention relates to display technique field, particularly relate to a kind of laser light emitting device and use light source and the projection display system of this laser light emitting device.
Background technology
Shadow casting technique has been widely used in our life and work, as projector.At present, the light source in shadow casting technique is still main flow with high-pressure sodium lamp.But the life-span of high-pressure sodium lamp only has several thousand hours, the long-time bulb that uses can be dimmed and affect display effect.The replacement scheme of high-pressure sodium lamp comprises LED light source and LASER Light Source two kinds, and this two schemes all has long-life advantage, and unlike LED light source luminosity not enough but low price, LASER Light Source brightness is high but costly.
From the angle of technical development, LASER Light Source replaces high-pressure sodium lamp and to be inevitable trend.But the laser that LASER Light Source uses has the high feature of collimation, this makes multiple laser beam can not effectively mix when propagating, and is discrete existence between laser facula.Therefore there is the not good problem of homogeneity in LASER Light Source.
In order to address this problem, now widely used is the scheme shown in Fig. 1.The wherein laser beam of light 111,112 and 113 signal three beams exiting parallel, on the O of cross section, they obviously will form three discrete laser faculas.These three light beams are incident in by its scattering after light-scattering component 121, and such as laser beam 111 is just become by light-scattering component 121 scattering the light cone 116 that a low-angle disperses.Like this, after each laser beam is scattered into a low-angle light cone, along with these light cones of propagation of light will be overlapping mutually near concurrent looks gradually, a more uniform hot spot can be obtained like this on the P of cross section.
The problem of such scheme is, the angle of divergence of laser beam becomes large, and this corresponds to the expansion of optical extend and the reduction of optical power density of whole light beam; And the scattering angle of light-scattering component larger (more even corresponding to laser beam) the then expansion that is directly proportional of optical extend, this can not bear for a lot of application.That is, the homogeneity of laser beam and optical extend are conflicts.Meanwhile, want to make the sufficient homogenising of hot spot need long light path to make each hot spot overlapping fully each other, also higher for space requirement like this, structure is compact not.
Summary of the invention
In order to solve the problem, the present invention proposes a kind of laser light emitting device, comprising many laser instruments for launching parallel multiple laser bundle, comprising condenser lens, for being focused on by parallel multiple laser bundle; Also comprise the light-scattering component being positioned at this condenser lens light path rear end; Light-scattering component is positioned at light path position A, make multiple laser bundle be radiated at the circumscribed circle diameter in the region that each hot spot on this light-scattering component is formed jointly, on the cross section being less than parallel multiple laser bundle the region that each laser facula surrounds jointly circumscribed circle diameter 1/5th; Wherein, the scattering angle of light-scattering component is not less than 2/3rds of the maximum angle focusing on rear adjacent laser beams.Also comprise light collecting lens, for collecting the laser beam through light scattering element scatters.
The present invention also proposes a kind of light source, comprises above-mentioned laser light emitting device, also comprises light transmission system and Wavelength converter, and the laser beam of laser light emitting device outgoing focuses on Wavelength converter and is excited to produce Stimulated Light to make it after light transmission system.
The present invention also proposes a kind of projection display system, comprises above-mentioned light source.
The present invention also proposes a kind of projection display system, comprises above-mentioned laser light emitting device.
Compared with prior art, although be realize being uniformly distributed of hot spot equally, outgoing beam of the present invention is what collimate, and such optical extend is less, and outgoing beam does not need long light path mutually overlapping to make between light beam, therefore required space is less.
Accompanying drawing explanation
Fig. 1 is the structural representation realizing the equally distributed method of laser beam in prior art;
Fig. 2 A is the structural representation of the first embodiment of laser light emitting device of the present invention;
Fig. 2 B describe beam of laser be incident in light-scattering component after dispersion effect;
Fig. 3 A describe beam of laser be incident in light-scattering component after Light distribation;
Fig. 3 B describe multiple laser be incident in light-scattering component after total Light distribation;
Fig. 4 A is the structural representation of another embodiment of laser light emitting device of the present invention;
Fig. 4 B is the front elevation of light-scattering component in Fig. 4 A embodiment;
Fig. 5 is the structural representation of another embodiment of laser light emitting device of the present invention;
Fig. 6 is the structural representation of light source of the present invention.
Embodiment
The present invention proposes a kind of laser light emitting device, and the structural representation of its first embodiment as shown in Figure 2 A.This laser light emitting device comprises many laser instruments (not shown in FIG.) for launching parallel multiple laser bundle 211,212,213, also comprises condenser lens 201, forms light cone 214 for being focused on by parallel multiple laser bundle 211,212,213.Condenser lens 201 can be a slice lens also can be a lens combination, does not limit here.Laser light emitting device also comprises the light-scattering component 202 being positioned at condenser lens 201 light path rear end, and the scattering angle of this light-scattering component 202 is not less than 2/3rds of the maximum angle focusing on rear adjacent laser beams.
First need to be described the maximum angle of adjacent laser beams and these two concepts of scattering angle of light-scattering component.As Fig. 2 A, laser beam 211,212,213 converges as light cone 214 after condenser lens 201, and in this light cone 214, adjacent laser interfascicular in an angle.Here the adjacent laser beams defining a laser beam X in light cone refers to that laser beam minimum with laser beam X angle.Angle due to adjacent laser beam differs and establishes a capital identical, therefore there is the maximal value of adjacent laser beams angle.Fig. 2 B shows the situation that laser beam 214a is incident in the emergent light 216a after light-scattering component 202.Visible, emergent light 216a has become a little light cone due to the effect of scattering, and the primary optical axis of this light cone is still along the direction of propagation of incoming laser beam 214; Namely the effect of light-scattering component 202 is just the laser beam 214 of incidence to spread centered by its direction of propagation.After diffusion, the angle of divergence of light cone 216a is determined by the attribute of light-scattering component 202 itself, and this angle of divergence is just defined as the scattering angle of light-scattering component 202.Specifically, after the scattering angle of light-scattering component 202 refers to scattering, in light cone, light intensity is full-shape angle corresponding to 1/2 place of center intensity.The angle of divergence of Fig. 3 A light-scattering component is diagrammatically explained.In Fig. 3 A, horizontal ordinate is angle, and ordinate is relative light intensity, and 311 represent the Light distribation being incident in the beam of laser bundle of light-scattering component, and its angle of divergence is very little as seen; 311a represents that laser beam 311 is by the Light distribation after light scattering element scatters, and its primary optical axis is still along the direction of laser beam 311 as seen, but the angle of divergence is much bigger.The center relative brightness of scattered beam is 1, then centered by its relative brightness brightness 1/2 that is 0.5 point between angle (full width at half maximum) be exactly the scattering angle of this light-scattering component.
In the present embodiment, the scattering angle of light-scattering component 202 is not less than 2/3rds of the maximum angle focusing on rear adjacent laser beams, and such brought effect as shown in Figure 3 B.In Fig. 3 B, horizontal ordinate is angle, and ordinate is relative light intensity.Three beams of laser bundle (for a branch of 311 wherein) in figure is corresponding to three laser beam in the light cone 214 in Fig. 2 A, and the Light distribation of these three laser beam after light-scattering component 202 scattering respectively as shown in the dotted line in Fig. 3 B (such as, wherein 311a is the scattered beam of laser beam 311).As visible in Fig. 3 B, scattering angle due to light-scattering component is not less than 2/3rds of the maximum angle of adjacent laser beams, like this, these three laser beam its Light distribation generation certain degree overlapping after light scattering element scatters, and overlapping after total Light distribation as shown at 316, can find out that its Light distribation is substantially even.
Get back to Fig. 2 A to be described.In fig. 2, light-scattering component 202 is positioned in the focus of laser light cone 214, three laser beam scattering and the mutual overlapping formation light cone 216 of light cone after each scattering after light-scattering component 202.Laser light emitting device also comprises light collecting lens 203, forms collimated light beam 217 for the laser beam 216 of collecting through light scattering element scatters.Light collecting lens 203 can be a slice lens in the present embodiment also can be one group of lens, does not limit here.
Because the Light distribation of light cone 216 distributes in uniform as Suo Shi 316 in Fig. 3 B, therefore according to basic optical principle, the P cross section glazing of collimated light beam 217 is also evenly distributed.Compared with the prior art shown in Fig. 1, although be realize being uniformly distributed of hot spot equally, the outgoing beam 217 of the present embodiment is for what collimate, and such optical extend is less.In essence, in the present embodiment, the homogeneity of outgoing beam 217 and its optical extend are no longer conflicts; This is because light-scattering component is placed on the convergent point of each laser beam in the present embodiment, the scattering angle that scattering produces just for filling up the angle space between each convergence laser beam, so substantially do not increase optical extend.In addition, compared with prior art, in the present embodiment, outgoing beam 217 does not need long light path mutually overlapping to make between light beam, and therefore required space is less.
Compared with prior art, invention increases condenser lens and light collecting lens, this has counter productive in optical design.But just the use of these optical elements make light-scattering component at scattering laser bundle and make it evenly while substantially do not increase optical extend (namely not increasing the angle of divergence of outgoing beam), this is ingenious part of the present invention just.
What deserves to be explained is, in the present embodiment, light-scattering component is positioned in the focus of condenser lens 201; As long as and in fact light-scattering component 202 is placed on the near focal point of condenser lens 201, be not necessarily placed on accurately in focus.Specifically, the light path position A at this light-scattering component 202 place, make multiple laser bundle 214 be radiated at the circumscribed circle diameter in the region that each hot spot on this light-scattering component is formed jointly, be less than 1/5th of the circumscribed circle diameter in the region that (such as O cross section) each laser facula surrounds jointly on the cross section of parallel multiple laser bundle.That is, the light path position A at light-scattering component place is that multiple laser bundle is focused on enough little position by condenser lens, can ensure the collimation (i.e. the optical extend of outgoing beam) of outgoing beam like this.Certainly, the focus that light-scattering component 202 is placed on condenser lens can make outgoing beam have best collimation, but consider that the power density at focus place is very high and may cause damage to light-scattering component, therefore in fact also light-scattering component may be positioned over the place of off-focal, the high power damage so both avoiding light-scattering component also can realize the effect of outgoing uniform beam.
The structure of an alternative embodiment of the invention as shown in Figure 4 A.With the embodiment shown in Fig. 2 A unlike, laser light emitting device also comprises drive unit 404 in the present embodiment, for driving light-scattering component 402 to move, makes the diverse location of light-scattering component 402 periodically be positioned at light path position A.The front elevation of light-scattering component 402 as shown in Figure 4 B, visible it be one positive circular, drive unit 404 drives it to rotate, such multiple laser bundle will focus on one of this light-scattering component 402 circumferentially, and this each point circumferentially periodically turns to the position (light path position A) that multiple laser bundle focuses on successively.Such benefit is to make the temperature of each point the too high to such an extent as to laser beam be focused to break, and is also conducive to the elimination of laser speckle simultaneously.
In the present embodiment, light-scattering component 402 drives at driven device in the process of rotating and is positioned at all the time on the A of light path position.In actual application, light-scattering component may be then a part circumferentially, remainder circumferentially can be other optical element, such as optical filter or optical wavelength conversion chip (flourescent sheet), like this along with rotation, whole different piece is circumferentially positioned at successively on the A of light path position and plays a role, and wherein light-scattering component can be positioned at light path position A at the special time period in each cycle and play the effect of scattered light.
In the above-described embodiments, the scattering angle of light-scattering component is not less than 2/3rds of the maximum angle focusing on rear adjacent laser beams, can ensure that adjacent laser beams can join together in the distribution of angle like this.But the scattering angle of light-scattering component neither be the bigger the better, because the collection efficiency of scattering angle larger then light collecting lens is lower.Therefore preferred, the scattering angle of light-scattering component is not more than the maximal value focusing on rear two angular separation between two laser bean, even if two its angle of laser beam distributions that angle is maximum so are all joined together, the angle this ensures that thering all laser beam distributes all to join together and formed and is uniformly distributed.
In the above-described embodiments, the multiple laser bundle of exiting parallel is evenly distributed.Such benefit is that the angle of the laser beam that each laser beam and its are adjacent is almost consistent, and the scattering angle ratio of such light-scattering component is easier to determine, and after scattering, Light distribation is more even.
The structure of an alternative embodiment of the invention as shown in Figure 5.With the embodiment shown in Fig. 2 A unlike, this laser light emitting device also comprises the lamp guide 506 between light-scattering component 502 and light collecting lens 503 light path, from the laser beam (illustrating with dotted line 516) of light-scattering component 502 outgoing through being collected by light collecting lens 503 after lamp guide 506 internal communication again.Such benefit is, lamp guide 506 can will incide the shaping by multiple reflections of wherein each laser beam, thus forms uniform light spots at light-emitting window; Light-scattering component 502 can form the distribution of uniform angle simultaneously, and the laser beam like this after light collecting lens 503 is collected just all achieves and is uniformly distributed on EDS maps and angle distribute two aspects.It should be noted that, before light-scattering component 502 must be positioned at the light path of lamp guide 506, the Light distribation being incident in lamp guide is like this angular range (instead of the Light distribation of several special angle very narrow laser beam), and the even light effect after such multiple reflections can strengthen greatly.Preferably, the light inlet of lamp guide 506 is near light-scattering component 502, and the emergent light that can improve light-scattering component like this on the basis reaching even light effect propagates into the efficiency of lamp guide.
The present invention also proposes a kind of light source, and the structural representation of this light source as shown in Figure 6.This light source comprises above-mentioned laser light emitting device 690.This laser light emitting device 690 adopts the structure identical with the embodiment shown in Fig. 4 A, but other embodiment of above-mentioned laser light emitting device may be used for the light source of the present embodiment too.The light source of the present embodiment also comprises light transmission system 607 and Wavelength converter 608, and the laser beam 617 of laser light emitting device outgoing focuses on Wavelength converter 608 and is excited to produce Stimulated Light to make it after light transmission system 607.Light transmission system 607 is convex lens 607 in the present embodiment, can certainly be lens combination.Can know according to explanation above, laser beam 617 has uniform distribution, and can obtain uniform hot spot on Wavelength converter 608 like this after light transmission system focuses on, such benefit is the raising of the light conversion efficiency of Wavelength converter.In the present embodiment, preferably, Wavelength converter 608 is fluorescence rotating disks 608, this light source also comprises drive unit 609 in addition, rotate for driving fluorescence rotating disk 608, make fluorescent material on fluorescence rotating disk periodically by the laser excitation of incidence, thus avoid the overheated of fluorescent material and burn.
The present invention also proposes a kind of projection display system, comprises above-mentioned laser light emitting device.
The present invention also proposes a kind of projection display system, comprises light source as shown in Figure 6.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize instructions of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a laser light emitting device, comprising many laser instruments for launching parallel multiple laser bundle, it is characterized in that:
Comprise condenser lens, for being focused on by parallel multiple laser bundle;
Comprise the light-scattering component being positioned at this condenser lens light path rear end; Light-scattering component is positioned at light path position A, make described multiple laser bundle be radiated at the circumscribed circle diameter in the region that each hot spot on this light-scattering component is formed jointly, on the cross section being less than parallel multiple laser bundle the region that each laser facula surrounds jointly circumscribed circle diameter 1/5th; Wherein, the scattering angle of light-scattering component is not less than 2/3rds of the maximum angle focusing on rear adjacent laser beams;
Also comprise light collecting lens, for collecting the laser beam through light scattering element scatters.
2. laser light emitting device according to claim 1, is characterized in that, also comprises drive unit, for driving light-scattering component to move, makes the diverse location of light-scattering component periodically be positioned at light path position A.
3. laser light emitting device according to claim 1 and 2, is characterized in that, light path position A is positioned in the focus of condenser lens.
4. laser light emitting device according to claim 1 and 2, is characterized in that, the scattering angle of light-scattering component is not more than the maximal value focusing on rear two angular separation between two laser bean.
5. laser light emitting device according to claim 1 and 2, is characterized in that, the multiple laser bundle of described exiting parallel is evenly distributed.
6. laser light emitting device according to claim 1 and 2, it is characterized in that, also comprise the lamp guide between light-scattering component and light collecting lens light path, from the laser beam of light-scattering component outgoing through being collected by light collecting lens again after lamp guide internal communication.
7. laser light emitting device according to claim 6, is characterized in that, the light inlet of described lamp guide is near light-scattering component.
8. a light source, it is characterized in that, comprise the laser light emitting device described in any one in claim 1 to 7, also comprise light transmission system and Wavelength converter, the laser beam of described laser light emitting device outgoing focuses on Wavelength converter and is excited to produce Stimulated Light to make it after light transmission system.
9. a projection display system, is characterized in that, comprises light source according to claim 8.
10. a projection display system, is characterized in that, comprises the laser light emitting device described in any one in claim 1 to 7.
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| CN106545757A (en) * | 2016-12-06 | 2017-03-29 | 武汉通畅汽车电子照明有限公司 | The full LASER Light Source modules of RGB and its optical path adjusting method |
| WO2017084504A1 (en) * | 2015-11-19 | 2017-05-26 | 深圳市绎立锐光科技开发有限公司 | Light source system and lighting device |
| CN107272313A (en) * | 2016-04-06 | 2017-10-20 | 上海蓝湖照明科技有限公司 | Light-emitting device and relevant projecting system and illuminator |
| CN108107658A (en) * | 2016-11-25 | 2018-06-01 | 深圳市光峰光电技术有限公司 | Light-source system, optical projection system and lighting device |
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| CN108508626A (en) * | 2018-03-16 | 2018-09-07 | 山西大学 | A kind of static diffusion sheet and dissipation spot method of movement scattering particles |
| CN111103744A (en) * | 2018-10-26 | 2020-05-05 | 深圳光峰科技股份有限公司 | Display device and display system |
| CN111103744B (en) * | 2018-10-26 | 2022-09-23 | 深圳光峰科技股份有限公司 | Display device and display system |
| CN111322587A (en) * | 2018-12-13 | 2020-06-23 | 深圳市中光工业技术研究院 | Light source device |
| CN111322587B (en) * | 2018-12-13 | 2022-09-02 | 深圳市中光工业技术研究院 | Light source device |
| WO2020199699A1 (en) * | 2019-04-04 | 2020-10-08 | 许江珂 | Laser backlight source of narrow-frame edge-lit liquid crystal display |
| CN112305772A (en) * | 2019-08-02 | 2021-02-02 | 三星显示有限公司 | Optical system for laser beam homogenization and laser heat treatment device comprising same |
| WO2021204035A1 (en) * | 2020-04-07 | 2021-10-14 | 深圳光峰科技股份有限公司 | Light source system and projection display device |
| WO2022155917A1 (en) * | 2021-01-22 | 2022-07-28 | 欧菲光集团股份有限公司 | Transmitting module, imaging module and electronic device |
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