CN102890398B - Light-emitting device and relevant projecting system - Google Patents
Light-emitting device and relevant projecting system Download PDFInfo
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- CN102890398B CN102890398B CN201210367073.5A CN201210367073A CN102890398B CN 102890398 B CN102890398 B CN 102890398B CN 201210367073 A CN201210367073 A CN 201210367073A CN 102890398 B CN102890398 B CN 102890398B
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Abstract
The embodiment of the invention discloses a kind of light-emitting device and projection arrangement, this light-emitting device comprises: for the excitation source of outgoing exciting light.Wavelength converter, for receiving exciting light and outgoing Stimulated Light or Stimulated Light and unabsorbed exciting light.Light collecting device, for collecting the emergent light of Wavelength converter, and by light path outgoing that this emergent light is separated from the light path with exciting light.Light splitting device, for receiving the emergent light of light collecting device, and by the Transmission light of the first polarization state wherein, by the light reflected light gathering-device of the second polarization state wherein.This reflected light also for receiving the reflected light of light splitting device, and is guided to the light-emitting face of Wavelength converter by light collecting device, and it is identical with the Exit positions of the emergent light of Wavelength converter that this reflected light is incident on the position on light-emitting face.Embodiments provide the light-emitting device of the brightness of technological requirement, rotational stability and the light-emitting device emergent light of taking into account Wavelength converter.
Description
Technical field
The present invention relates to illumination and display technique field, particularly relate to a kind of light-emitting device and relevant projecting system.
Background technology
Optical projection system in the market comprises three classes substantially: DLP (DigitalLightProcessing, the process of numeral light path) optical projection system, LCD (liquidcrystaldisplay, liquid crystal display) optical projection system and LCOS (LiquidCrystalonSilicon, liquid crystal on silicon) optical projection system.Wherein, LCD optical projection system and LCOS optical projection system all need the emergent light of light source outgoing polarization light or light source be converted to polarized light just may be used for projection.
Fig. 1 be a kind of in prior art can the structural representation of light-emitting device of outgoing polarization light, as shown in Figure 1, light-emitting device comprises light source 110, Wavelength converter 120, light splitting device 130, drive unit 140.Light source 110 outgoing exciting light L1, Wavelength converter 120 comprises material for transformation of wave length, and material for transformation of wave length absorbs exciting light L1 to produce Stimulated Light.The mixed light L2 of Stimulated Light and unabsorbed exciting light is from Wavelength converter 120 outgoing to light splitting device 130.Wherein, Wavelength converter 120 rotates under the driving of drive unit 140, to reduce the working temperature of Wavelength converter.Light splitting device 130 can p polarized light L3 in transmission incident light and reflect s polarized light L4, wherein s polarized light L4 is incident to again Wavelength converter 120 and is scattering into nonpolarized light by material for transformation of wave length, this nonpolarized light can incide light splitting device 130 again, thus repeatedly circulation makes light splitting device 130 outgoing p polarized light L3.
But the shortcoming of the light-emitting device of prior art is: the emergent light due to material for transformation of wave length has full angle outgoing, this emergent light can spread in the process propagated, light splitting device is enough near with the distance on the surface of Wavelength converter emergent light, the emergent light that could receive as far as possible multi-wavelength conversion equipment is changed, and this just has quite high requirement to the technological requirement of Wavelength converter and rotational stability.But in prior art, Wavelength converter can under the driving of drive unit high-speed rotation, the distance of light splitting device and Wavelength converter is difficult to accomplish very near, the hot spot that the polarized light that in light cyclic process, light splitting device reflects can be caused to be incident on Wavelength converter expands, brightness is caused to reduce, and the distance of degree to light splitting device and Wavelength converter that hot spot expands is very sensitive, distance is far away, and the degree that hot spot expands is larger.Therefore, in prior art, between the brightness of the emergent light of the technological requirement of Wavelength converter, rotational stability and light-emitting device, there is contradiction.
Summary of the invention
The technical matters that the present invention mainly solves is to provide a kind of light-emitting device and relevant projecting system, can take into account the brightness of the emergent light of the technological requirement of Wavelength converter, rotational stability and light-emitting device simultaneously.
Embodiments provide a kind of light-emitting device, it is characterized in that, comprising:
Excitation source, this excitation source is used for outgoing exciting light;
Comprise the Wavelength converter of material for transformation of wave length, material for transformation of wave length is for absorbing exciting light to produce Stimulated Light, this Wavelength converter is for receiving exciting light, and at least part of light in the mixed light of at least part of Stimulated Light of outgoing or this Stimulated Light and unabsorbed exciting light;
Light collecting device, in light path between Wavelength converter and light splitting device, for collecting the emergent light of Wavelength converter, and by this emergent light from emitting light path outgoing, and this emitting light path is separated with the light path of the exciting light inciding Wavelength converter;
Light splitting device, for receiving the emergent light of light collecting device, and by the Transmission light of the first polarization state in this emergent light, simultaneously by the light reflected light gathering-device of the second polarization state in this incident light;
Light collecting device is also for receiving the light of the second polarization state of the reflection of light splitting device, and guided to by the light of this second polarization state on the light-emitting face of the emergent light of Wavelength converter, it is identical with the Exit positions of the emergent light of Wavelength converter that the light of this second polarization state is incident on the position on light-emitting face.
Present invention also offers a kind of optical projection system, this light-source system comprises above-mentioned light-emitting device.
Compared with prior art, the embodiment of the present invention has following beneficial effect:
In the present embodiment, the emergent light of Wavelength converter is collected into light splitting device through light collecting device, the light of the second polarization state of light splitting device reflection is reflected back Wavelength converter through this light collecting device again, and it is identical with the Exit positions of the emergent light of Wavelength converter that the light of the second polarization state is incident on the position on the light-emitting face of Wavelength converter, therefore the hot spot on Wavelength converter and process that the hot spot in light splitting device is circulating can not expand, thus brightness can be avoided to reduce.Also because hot spot can not expand in the process of circulation, so do not need the distance of requirement Wavelength converter and light collecting device very near, therefore too high requirement can not be had to the technological requirement of Wavelength converter and job stability.
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of light-emitting device in prior art;
Fig. 2 is the structural representation of an embodiment of embodiment of the present invention light-emitting device;
Fig. 3 is another structural representation of embodiment of the present invention light-emitting device;
Fig. 4 a is another structural representation of embodiment of the present invention light-emitting device;
Fig. 4 b is another structural representation of light-emitting device in Fig. 4 a illustrated embodiment;
Fig. 5 is another structural representation of embodiment of the present invention light-emitting device;
Fig. 6 is another structural representation of embodiment of the present invention light-emitting device.
Embodiment
Below in conjunction with drawings and embodiments, the embodiment of the present invention is described in detail.
Embodiment one:
Fig. 2 is a kind of structural representation of embodiment of the present invention light-emitting device, and as shown in Figure 2, light-emitting device 200 comprises excitation source 210, Wavelength converter 220, light collecting device 230, light splitting device 240.
Excitation source 210 is for outgoing exciting light L1.In the present embodiment, excitation source 210 is specially blue laser light source, and in other embodiment of the present invention, excitation source can also be LED or phosphor source etc.
Wavelength converter 220 comprises material for transformation of wave length, material for transformation of wave length absorbs exciting light L1 to produce Stimulated Light, this Wavelength converter 220 is for receiving exciting light L1, and emergent light L2 is excited in outgoing at least partly, this is excited emergent light may be all the Stimulated Light of material for transformation of wave length, also may be the mixed light of this Stimulated Light and unabsorbed exciting light.Particularly, in the present embodiment, Wavelength converter 220 comprises first surface 220a and second surface 220b, and first surface 220a is for receiving exciting light L1, and second surface 220b is used for outgoing and is excited emergent light L2.
In the light path of light collecting device 230 between Wavelength converter 220 and light splitting device 240, for collecting the emergent light L2 of Wavelength converter 220, and by this emergent light from emitting light path outgoing, and this emitting light path is separated with the light path of the exciting light L1 that incides Wavelength converter 230, returns excitation source 210 to avoid being excited emergent light and form loss.In the present embodiment, exciting light L1 incides the first surface 220a of Wavelength converter, and light collecting device 230 collect the second surface 220b of Wavelength converter be excited emergent light L2, thus the light path of emergent light L2 of being excited achieving exciting light L1 and second surface 220b is separated.In the present embodiment, light collecting device 230 is specially lens, and the emergent light L2 of Wavelength converter 220 can focus on a bit by these lens 230.
Light splitting device 240 is excited emergent light L2 for what receive light collecting device 230, and this is excited the light L3 transmission of the first polarization state in emergent light L2, simultaneously by light (not shown in FIG.) the reflected light gathering-device 230 of the second polarization state in this incident light.In the present embodiment, light splitting device is specially reflective polarizer, such as wire grid polarizers, the black type polarizer of courage etc., and wherein reflective polarizer structure is simple, insensitive to the angle of incident light, is a kind of preferred device.
Light collecting device 230 is also for receiving the light of the second polarization state of the reflection of light splitting device 240, and what the light of this second polarization state is guided to Wavelength converter 220 is excited on the light-emitting face of emergent light L2, the light of this second polarization state be incident on position on light-emitting face and Wavelength converter to be excited the Exit positions of emergent light L2 identical.For ensure the reflected light of light splitting device 240 be incident on position on light-emitting face and Wavelength converter to be excited the Exit positions of emergent light L2 identical, method is the optical system being designed to light collecting device to have a pair conjugate plane, ensures that the exiting surface of light splitting device 240 incidence surface and Wavelength converter 220 lays respectively in this pair conjugate plane simultaneously.The incidence surface of light splitting device is here the surface of the light splitting device of the emergent light incidence of Wavelength converter, and this incidence surface is also the surface of the light of the second polarization state of light splitting device reflection simultaneously.In the optical system with a pair conjugate plane, point Q and Q ' in two conjugate plane has mapping relations one to one, namely according to light path principle of reversibility, if place light source at Q point, will Q ' some imaging, and vice versa.2 points so in correspondence with each other, are called a pair conjugate points, and the face be made up of conjugate points is conjugate plane.Therefore when the incidence surface of light splitting device 240 and the exiting surface of Wavelength converter 220 lay respectively in a pair conjugate plane of light collecting device, the reflected light of light splitting device 240 be incident on position on the light-emitting face of light collecting device and Wavelength converter to be excited the Exit positions of emergent light L2 identical.
Particularly, lay respectively in a pair conjugate plane for realizing light splitting device 240 with the exiting surface of Wavelength converter 220, light collecting device 230 can be imaging optical system, such as, collecting lens group in the present embodiment, what collecting lens group 230 collected the light-emitting face of Wavelength converter and second surface 220b is excited emergent light L2, and this is excited emergent light L2 and focuses on a bit, the incidence surface of light splitting device 240 is positioned on this aspect, and now light splitting device 240 lays respectively in a pair conjugate plane with the exiting surface of Wavelength converter 220.The Wavelength converter being positioned at object plane is excited emergent light hot spot and is positioned at a pair conjugate plane with the launching spot on the light splitting device surface being positioned at image planes, according to optical imaging concept, from the reflected light on the surface of the light splitting device of image planes in the position of the light-emitting face returning Wavelength converter inevitable with Wavelength converter to be excited the Exit positions of emergent light identical.In other embodiment of the present invention, light collecting device 230 can also be that other has the device of focal imaging effect.
Compared with prior art, in the present embodiment, the emergent light L2 of Wavelength converter 220 is collected into light splitting device 240 through light collecting device 230, the light of the second polarization state that light splitting device 240 reflects is reflected back Wavelength converter 220 through this light collecting device 230 again, and it is identical with the Exit positions of the emergent light L2 of Wavelength converter 220 that the light of the second polarization state is incident on the position on the light-emitting face of Wavelength converter 220, therefore the hot spot on Wavelength converter and process that the hot spot in light splitting device is circulating can not expand, thus brightness can be avoided to reduce.Also because hot spot can not expand in the process of circulation, so do not need the distance of requirement Wavelength converter and light collecting device very near, therefore too high requirement can not be had to the technological requirement of Wavelength converter and job stability.
In the present embodiment, Wavelength converter 220 comprises wavelength conversion layer 221, substrate 222.Wavelength conversion layer 221 comprises material for transformation of wave length.Material for transformation of wave length is specially yellow fluorescent powder, such as YAG fluorescent powder, and it can absorb blue light and the Stimulated Light of stimulated emission yellow.Material for transformation of wave length may be also the material that quantum dot, fluorescent dye etc. have wavelength conversion capability, is not limited to fluorescent powder.Substrate 222 is clear glass, can play a supporting role to wavelength conversion layer 221.Preferably, the surface of substrate 222 arranges one deck filter coating, and this filter coating can transmit blue and reflect yellow Stimulated Light, can improve the utilization factor of Stimulated Light; Further, filter coating can the blue light of transmission low-angle incidence and the blue light of reflect yellow Stimulated Light and wide-angle, and the blu-ray reflection of the wide-angle reflected from wavelength conversion layer 221 can be returned wavelength conversion layer 221 excites again, thus raises the efficiency.But when the rigidity of wavelength conversion layer own is enough (such as wavelength conversion layer is formed by being entrained in clear glass by fluorescent powder), substrate is omissible, now filter coating can be plated in the surface of wavelength conversion layer, there is identical effect equally.
In the present embodiment, light-emitting device 200 also comprises drive unit 223, drive unit 223 moves for driving wavelength conversion layer 221 and substrate 222, this wavelength conversion layer 221 is acted on along predefined paths, with the problem avoiding exciting light long duration of action to raise in this wavelength conversion layer temperature that the same position of wavelength conversion layer 221 causes with the hot spot making exciting light L1 be formed on this wavelength conversion layer 221.Particularly, in the present embodiment, drive unit 223 rotates for driving wavelength conversion layer 221 and substrate 222, acts on this wavelength conversion layer 221 with the hot spot making exciting light be formed on this wavelength conversion layer 221 along predetermined circular path.Preferably, substrate 222 is in the form of annular discs, and wavelength conversion layer 221 is in the ring-type concentric with this disk, and drive unit 223 is cylindrical motor, and drive unit 223 and substrate 222 are coaxially fixed.In other embodiment of the present invention, drive unit 223 also can drive wavelength conversion layer otherwise to move, such as horizontal reciprocating movement etc.When wavelength conversion layer 221 material for transformation of wave length can withstand higher temperatures, Wavelength converter 220 also can not arrange drive unit.
In the present embodiment, wavelength conversion layer 221 only includes a region, and this region is provided with yellow fluorescent powder, and wavelength conversion layer 221 absorbs blue laser to produce yellow Stimulated Light, and this yellow Stimulated Light becomes white light outgoing with unabsorbed blue light.In other embodiments of the present invention, wavelength conversion layer 221 can comprise two or more region, in this two or more region, at least one is provided with material for transformation of wave length, and other region can arrange the different material of function, as the material for transformation of wave length or scattering material etc. of other kind.Such as, wavelength conversion layer 221 comprises three regions, be respectively arranged with red fluorescence powder, green emitting phosphor and scattering material, red fluorescence powder and green emitting phosphor absorb blue laser respectively and produce ruddiness and green glow, scattering material receives blue laser and by its scattering with outgoing after eliminating coherence, therefore wavelength conversion layer 221 can red bluish-green three coloured light of outgoing.
In addition, because material for transformation of wave length can not reach absolutely to the absorption of exciting light, in the emergent light of wavelength conversion layer 221, always part exciting light is comprised.Therefore, in other embodiments of the present invention, when not needing exciting light in the emergent light of light-emitting device, light-emitting device can also arrange the emergent light of filtering apparatus to wavelength conversion layer and filter.Filtering apparatus comprises optical filter, can receive the emergent light of wavelength conversion layer, and filters out wherein at least part of exciting light.In the present embodiment, filtering apparatus can be arranged on the first surface of Wavelength converter, this filtering apparatus can the exciting light of transmission Stimulated Light and low-angle incidence, and the exciting light of reflection wide-angle, the exciting light composition in Wavelength converter emergent light will reduce greatly.In addition, can also arrange optical filtering colour wheel, optical filtering colour wheel can transmission exciting light, reflection Stimulated Light, and optical filtering colour wheel and Wavelength converter synchronous axial system, can filter out the exciting light of Wavelength converter emergent light, now light-emitting device can an outgoing Stimulated Light.
Embodiment two:
Fig. 3 is another structural representation of embodiment of the present invention light-emitting device, and as shown in Figure 3, light-emitting device 300 comprises excitation source 310, Wavelength converter 320, light collecting device 330 and light splitting device 340.
The light-emitting device of the present embodiment is from the difference of light-emitting device shown in Fig. 2: the light collecting device 330 of light-emitting device 300 is act on different lens with light collecting device 230 in enforcement one, the emergent light of Wavelength converter 320 is adjusted to directional light by these lens 330, former for this directional light road perpendicular to the incident direction of this directional light, and returns by light splitting device 340.Incident light is adjusted to directional light and by its vertical exit on the incidence surface of light splitting device 340 by lens here, and the light that can realize the second polarization state that polarization spectro sheet 340 reflects equally is incident on position on the light-emitting face of Wavelength converter 320 and to be excited the Exit positions of emergent light L2 identical.Relative to the embodiment shown in Fig. 2, lens 330 in the present embodiment are that the emergent light of fluorescent powder is adjusted to directional light, therefore the curvature of lens 330 does not need the very large of design, it is relatively easy to make, in addition, the directional light that polarization spectro sheet 340 need keep its exiting surface vertical and incident, position accuracy demand is not high, relatively more easily regulates.In other embodiments of the present invention, light collecting device 330 can also be that tulip lens etc. have the optical element of collimating effect or the combination of optical element.
Embodiment three:
Fig. 4 a is another structural representation of embodiment of the present invention light-emitting device, and as shown in fig. 4 a, light-emitting device comprises excitation source 410, Wavelength converter 420, light collecting device 430 and light splitting device 440.The difference of the light-emitting device in the present embodiment and the light-emitting device shown in Fig. 2 200 is:
1) substrate 422 of Wavelength converter 420 is provided with reflection horizon, on the surface of contact of this reflection horizon between wavelength conversion layer 421 and substrate 422, wavelength conversion layer 421 light shone on this reflection horizon can be reflected back first surface 420a.First surface 420a receives exciting light and part light in the mixed light of emission parts Stimulated Light or Stimulated Light and unabsorbed exciting light.When the rigidity of wavelength conversion layer own is enough (such as wavelength conversion layer is formed by being entrained in clear glass by fluorescent powder), substrate is omissible, now reflection horizon can be plated in the surface relative with first surface of wavelength conversion layer, has identical effect equally.In addition, when wavelength conversion layer medium wavelength transition material thickness is enough, also can not need to arrange reflection horizon.In other embodiment of the present invention, substrate 422 also can be the hard material that high anti-aluminium sheet etc. has highly reflective surface.
2) light collecting device 430 is the cambered surface reflection unit of the reflecting surface 432 comprising light hole 431 and light hole outside, exciting light is incident on wavelength conversion layer 421 through light hole 431, the major part of the emergent light of wavelength conversion layer 421 is reflected by the reflecting surface 432 of cambered surface reflection unit and is incident to light splitting device 440, and fraction leaks from light hole 431.Cambered surface reflection unit 430 is a part for semielliptical shape or semielliptical shape, and wavelength conversion layer 421 is arranged at a focus of this ellipsoid, light splitting device 440 is positioned at another focus, thus most of light of wavelength conversion layer outgoing through the reflective surface of cambered surface reflection unit to another focus of this ellipsoid, i.e. light splitting device 440; Or, cambered surface reflection unit 430 also can be semisphere or a hemispheric part, and wavelength conversion layer is arranged at the A point near this spherical centre of sphere, light splitting device is positioned at B point, A and B is symmetrical about the centre of sphere, thus most of light of wavelength conversion layer outgoing through the reflective surface of cambered surface reflection unit to light splitting device so that carry out light collection.Therefore, in the present embodiment, the emitting light path of wavelength conversion layer 421 emergent light reflects through reflecting surface 432, incide the light path of the exciting light of wavelength conversion layer 421 then through light hole 431 transmission, thus achieve exciting light light path by the setting of curved reflectors and be excited being separated of emergent light light path.
In the present embodiment, curved reflectors is the light collecting device with a pair conjugate plane of another kind of form.For curved reflectors, wavelength conversion layer and light splitting device, about its physical centre symmetrically relation, optically have the character of conjugation.The reflected light that therefore can realize light splitting device be equally incident on position on the light-emitting face of Wavelength converter and Wavelength converter to be excited the Exit positions of emergent light identical.In addition, light collecting device is not limited in the cambered surface reflection unit of the band light hole in the present embodiment, cambered surface reflection unit that in other embodiments also can not be with holes, only need from incident from the gap between cambered surface reflection unit and Wavelength converter by exciting light.
In the present embodiment, utilize reflective Wavelength converter that the structure of light-emitting device can be made compacter.The structure of cambered surface reflection unit is simple, and collection efficiency is higher, also has lower-cost advantage.
In other embodiment of the present invention, light collecting device can also be made up of plural parts.Fig. 4 b is another structural representation of light-emitting device in Fig. 4 a illustrated embodiment, as shown in Figure 4 b, light collecting device 430 comprises square rod 432, curved reflectors 431, in the light path of square rod 432 between curved reflectors 431 and light splitting device 440, the reflecting surface that curved reflectors 431 comprises a light hole and is centered around around this light hole, light hole for transmission exciting light to the first surface of Wavelength converter, reflecting surface is collected the emergent light of the first surface of Wavelength converter and is collected into a bit, the incident light plane of square rod 432 is positioned on this aspect, for receiving the emergent light of curved reflectors 431, and by this emergent light outgoing to polarization beam splitter 440, square rod 432 is also for receiving the light of the second polarization state that polarization beam splitter 440 reflects, and guide the light of this second polarization state to be incident to curved reflectors 431.Square rod 432 is specially taper square rod, and the incidence surface of taper square rod 432 is positioned on the convergent point of the emergent light of curved reflectors 431, and light splitting device 440 is parallel with this exiting surface near the exiting surface of taper square rod 432.The emergent light of light collecting device 431 is incident to light splitting device 440 after taper square rod 432, the light of the second polarization state wherein can be polarized light-dividing device 440 and reflect, because the exiting surface of taper square rod 432 and incidence surface are a pair conjugate plane, in taper square rod 432 to carry out recovering light path identical, the light of the second polarization state still can be back to the Exit positions of Wavelength converter 420 emergent light.In the present embodiment, taper square rod can also carry out even light to the emergent light of Wavelength converter, and the shape of the shape of this emergent light hot spot and projection screen can be made more close, can also reduce the lighting angle of this emergent light, improves transfer efficiency.In other embodiments of the present invention, square rod can also be excellent with other formal integral, CPC (CompoundParabolicConcentrator, composite parabolic gatherer) etc. there is the device of a pair conjugate plane, namely the identical device replacement of recovering light path is carried out in inside, only need be arranged in the light path between Wavelength converter and light splitting device.
Embodiment four
Fig. 5 is another structural representation of embodiment of the present invention light-emitting device, and as shown in Figure 5, light-emitting device comprises excitation source 510, Wavelength converter 520, light collecting device 530 and light splitting device 540.Shown in light-emitting device in the present embodiment and Fig. 4 a, the difference of light-emitting device is: light collecting device 530 comprises catoptron 531 with holes and lens 532, the emergent light of Wavelength converter 520 can be adjusted to directional light by this light collecting device 530, and makes it impinge perpendicularly on light splitting device.Particularly, exciting light incides lens 532 through the through hole of catoptron 531, and exciting light is focused to the first surface 520a of Wavelength converter 520 by lens 532.The emergent light of Wavelength converter 520 is incident to lens 532 and is adjusted to directional light, and be incident to reflective mirror 531 with holes, reflective mirror with holes 531 and directional light form an angle slant setting, this directional light can be reflexed to light splitting device 540, achieve the light path that the emitting light path of the emergent light of Wavelength converter 520 and exciting light be incident to Wavelength converter 520 and be separated.Directional light vertical incidence, to light splitting device 540, can be polarized light-dividing device 540 and reflects and return along original optical path.In the present embodiment, on the basis of cramped construction utilizing reflective Wavelength converter, the emergent light of Wavelength converter 520 can be adjusted to directional light by light collecting device 530, the directional light that polarization spectro sheet 540 need keep its exiting surface vertical and incident, position accuracy demand is not high, relatively more easily regulates.
When excitation source 510 comprises multiple light-emitting component, catoptron 531 with holes can be arranged multiple through hole and light-emitting component one_to_one corresponding, be incident in a through hole of catoptron 531 with holes after also the emergent light of multiple light-emitting component can being converged.Catoptron with holes also can replace with the material that other has reflection function, and for the ease of processing through hole, preferably, catoptron can replace with the anti-aluminium sheet of height.In addition, the through hole of catoptron 531 with holes can also arrange optical filter, and this optical filter can transmission exciting light and reflect Stimulated Light, thus can improve the utilization ratio of Stimulated Light.
In addition, when not needing exciting light in the emergent light of light-emitting device, catoptron with holes can replace with optical filter, this optical filter can transmission exciting light and reflect Stimulated Light, relative to catoptron with holes, Stimulated Light can not be lost from through hole transmission, improves the utilization ratio of Stimulated Light.In addition, optical filter can also have the effect of modifying the spectrum of Stimulated Light.
Embodiment five
Fig. 6 is another structural representation of embodiment of the present invention light-emitting device, and as shown in Figure 6, light-emitting device comprises excitation source 610, Wavelength converter 620, light collecting device 630 and light splitting device 640.Light-emitting device in the present embodiment and the difference of the light-emitting device shown in Fig. 5 are: the light collecting device 630 in the present embodiment is the free form surface reflection horizon of being with light hole, this light hole for transmission exciting light to the first surface 620a of Wavelength converter, the emergent light of the first surface 620a of Wavelength converter 620 can be collected in this free form surface reflection horizon, and this emergent light is adjusted to the incident light plane of directional light vertical exit to light splitting device 640.The light collecting device formed with lens and catoptron with holes is compared, free form surface reflection horizon just can realize collection and the collimating effect of light by an element, relatively simple for structure, but the collection area in free form surface reflection horizon is less, lower to the collection efficiency of the emergent light of Wavelength converter.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
The embodiment of the present invention also provides a kind of optical projection system, comprises light-emitting device, and this light-emitting device can have the structure and fuction in the various embodiments described above.This optical projection system can adopt various shadow casting technique, such as liquid crystal display (LCD, LiquidCrystalDisplay) shadow casting technique, digital light path processor (DLP, DigitalLightProcessor) shadow casting technique.
The foregoing is only embodiments of the present 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 light-emitting device, is characterized in that, comprising:
Excitation source, this excitation source is used for outgoing exciting light;
Comprise the Wavelength converter of material for transformation of wave length, described material for transformation of wave length is for absorbing described exciting light to produce Stimulated Light, this Wavelength converter is for receiving described exciting light, and emergent light is excited in outgoing at least partly, described in be excited emergent light be described Stimulated Light or the mixed light for this Stimulated Light and unabsorbed exciting light;
Light collecting device, in light path between described Wavelength converter and light splitting device, for collecting the emergent light of described Wavelength converter, and by this emergent light from emitting light path outgoing, and this emitting light path is separated with the light path of the exciting light inciding described Wavelength converter;
Light splitting device, for receiving the emergent light of described light collecting device, and by the Transmission light of the first polarization state in this emergent light, simultaneously by the light reflected light gathering-device of the second polarization state in this incident light;
Described light collecting device is also for receiving the light of the second polarization state of the reflection of described light splitting device, and guided to by the light of this second polarization state on the light-emitting face of the emergent light of described Wavelength converter, the position that the light of this second polarization state is incident on described light-emitting face is identical with the Exit positions of the emergent light of described Wavelength converter.
2. light-emitting device according to claim 1, it is characterized in that, described Wavelength converter comprises wavelength conversion layer and reflection horizon, this wavelength conversion layer comprises relative first surface and second surface, described reflection horizon is arranged at the second surface of described wavelength conversion layer, for being reflected into the exciting light or Stimulated Light that are mapped to this reflection horizon, the first surface of described wavelength conversion layer is for receiving described exciting light, described first surface also at least part of light in the mixed light of at least part of described Stimulated Light of outgoing or this Stimulated Light and unabsorbed exciting light to described light collecting device.
3. light-emitting device according to claim 2, it is characterized in that: described light collecting device is curved reflectors, the reflecting surface that described curved reflectors comprises a light hole and is centered around around this light hole, described light hole for exciting light described in transmission to the first surface of described Wavelength converter, described reflecting surface is collected the emergent light of the first surface of described Wavelength converter and is collected into a bit, and the incidence surface of described light splitting device is positioned on this aspect.
4. light-emitting device according to claim 2, it is characterized in that: described light collecting device comprises lens and plane reflection unit, described plane reflection device comprises through hole and is centered around the reflection horizon around this through hole, described through hole for exciting light described in transmission to the first surface of described Wavelength converter, described lens for collect the first surface of described Wavelength converter emergent light and after this emergent light being adjusted to directional light outgoing to described reflection horizon, described reflection horizon be used for by the directional light of incidence reflect after from emitting light path vertical exit to described light splitting device, and this emitting light path is separated with the input path of the exciting light inciding described Wavelength converter.
5. light-emitting device according to claim 2, it is characterized in that: described light collecting device is the free form surface reflection horizon comprising band light hole, described light hole for exciting light described in transmission to the first surface of described Wavelength converter, this emergent light for collecting the emergent light of the first surface of described Wavelength converter, and is adjusted to the incidence surface of directional light vertical exit to described polarization spectro assembling device by described reflecting surface.
6. light-emitting device according to claim 1, is characterized in that: described light collecting device comprises curved reflectors and square rod;
The reflecting surface that described curved reflectors comprises a light hole and is centered around around this light hole, described light hole for exciting light described in transmission to the first surface of described Wavelength converter, described reflecting surface is collected the emergent light of the first surface of described Wavelength converter and is collected into a bit, and the incidence surface of described square rod is positioned on this aspect;
Described square rod is for receiving the emergent light of described light collecting device, and by this emergent light outgoing to described polarization beam splitter, also for receiving the light of the second polarization state of described polarization beam splitter reflection, guide the light of this second polarization state to be incident to described curved reflectors, and in described square rod to carry out recovering light path identical.
7. light-emitting device according to claim 1, it is characterized in that, described Wavelength converter comprises relative first surface and second surface, described first surface is for receiving described exciting light, and second surface is used at least part of light extremely described light collecting device in the mixed light of at least part of described Stimulated Light of outgoing or this Stimulated Light and unabsorbed exciting light.
8. light-emitting device according to claim 7, it is characterized in that, described light collecting device is lens, and this emergent light for collecting the emergent light of the second surface of described Wavelength converter, and is adjusted to the incidence surface of directional light vertical exit to described light splitting device by these lens.
9. light-emitting device according to claim 1, is characterized in that: described light splitting device is reflective polarizer.
10. an optical projection system, is characterized in that, comprises light-emitting device as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
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| CN101923223B (en) * | 2009-06-12 | 2012-09-05 | 深圳市绎立锐光科技开发有限公司 | Polarized light source, polarization conversion method and device thereof, and application system |
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Address after: 518000 20-22, 20-22 headquarters building, 63 high tech Zone, Xuefu Road, Nanshan District, Guangdong Province, Guangdong. Patentee after: APPOTRONICS Corp.,Ltd. Address before: 518000 Nanshan District, Shenzhen, Guangdong, Guangdong Province, Guangdong Road, 63 Xuefu Road, high-tech zone, 21 headquarters building, 22 floor. Patentee before: SHENZHEN GUANGFENG TECHNOLOGY Co.,Ltd. Address after: 518000 Nanshan District, Shenzhen, Guangdong, Guangdong Province, Guangdong Road, 63 Xuefu Road, high-tech zone, 21 headquarters building, 22 floor. Patentee after: SHENZHEN GUANGFENG TECHNOLOGY Co.,Ltd. Address before: 518055 Guangdong province Shenzhen Nanshan District Xili town Cha Guang road Shenzhen integrated circuit design application Industrial Park 401 Patentee before: APPOTRONICS Corp.,Ltd. |