CN103822140A - Light source with light emitting diode, projection display light source and projection display light machine - Google Patents

Light source with light emitting diode, projection display light source and projection display light machine Download PDF

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CN103822140A
CN103822140A CN201410048912.6A CN201410048912A CN103822140A CN 103822140 A CN103822140 A CN 103822140A CN 201410048912 A CN201410048912 A CN 201410048912A CN 103822140 A CN103822140 A CN 103822140A
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light
emitting diode
light emitting
transversal
reflector
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吴震
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Abstract

The invention provides a light source with a light emitting diode. The light source comprises the light emitting diode and a reflective bowl. A light emitting surface of the light emitting diode is rectangular, the reflective bowl covers the upper side of the light emitting diode and comprises a middle light hole and a reflective surface, an emergent light path of the light emitting diode can be formed by the middle light hole, the reflective surface is arranged on the periphery of the light hole, and a reflective light path of the light emitting diode can be formed by the reflective surface; the lengths of section lines of the light hole in various directions are characterized in that the longest section lines of the light hole are located in the direction of long sides of the light emitting surface of the light emitting diode, the shortest section lines of the light hole are located in the direction of short sides of the light emitting surface of the light emitting diode, the lengths of the section lines of the light hole in the other directions are gradually changed within the ranges of the lengths of the section lines in the two directions according to certain included angles, and the certain included angles are formed among the other directions and the two directions. The light source with the light emitting diode has the advantages that owing to the characteristics of the light hole, the positions of light spots formed after light emitted by the light emitting diode is reflected by the reflective surface can be optimally matched with the position of the light emitting diode, and accordingly the large-angle light recycling efficiency can be improved.

Description

LED source, Projection Display light source and Projection Display ray machine
 
Technical field
The present invention relates to demonstration field, particularly relate to LED source, Projection Display light source, Projection Display ray machine and projector equipment.
 
Background technology
Projection display technique development at present rapidly.The principle of Projection Display is, provides light beam with light source, and on this light beam irradiates to one light valve, light valve is modulated and made it carry image information this light, and this light that has carried image information has out just been formed projected image by a projection lens projects again.Light source uses high-pressure sodium lamp light source traditionally, and light emitting diode (LED) light source is widely used as a kind of novel light source in projection display technique in recent years, and its advantage is that the life-span is longer more than ten times than conventional light source.
But light emitting diode is luminance shortage as a major issue of light source, i.e. luminous flux deficiency in light-emitting area unit of unit lighting angle.This directly causes being incident in the luminous flux deficiency of light valve, thereby the emergent light brightness of whole optical projection system is affected.
 
Summary of the invention
For above-mentioned problem, the present invention proposes a kind of LED source, comprises that light-emitting area is rectangular light emitting diode, and light emitting diode comprises optical axis, the geometric center through lumination of light emitting diode face that this optical axis is vertical; Also comprise the reflector that covers light emitting diode top, the luminous light path of light emitting diode is divided into emitting light path and reflected light path two parts by reflector, the light part that light emitting diode sends is incident on the reflective surface of reflector and is reflected back light emitting diode by it along reflected light path, a part is along the direct outgoing of emitting light path; Reflector comprises that the loophole at middle part is to form the emitting light path of light emitting diode, also comprises that loophole reflective surface is around to form the reflected light path of light emitting diode; Wherein, the transversal length of loophole in all directions meets following characteristics: the transversal length of loophole on the long side direction of lumination of light emitting diode face is the longest, transversal on the short side direction of lumination of light emitting diode face is the shortest, transversal length gradual change between the transversal length on above-mentioned both direction according to the angle of its direction and above-mentioned both direction in other direction.
The present invention also proposes a kind of Projection Display light source, comprises redness, green, blue three sub-light sources, the photosynthetic emergent light for a branch of this Projection Display light source of common formation that these three sub-light sources send; Wherein, at least one sub-light source comprises above-mentioned LED source.
The present invention also proposes a kind of Projection Display ray machine, comprise the Projection Display light source that power is above-mentioned, also comprise light valve and projection lens, the emergent light of Projection Display light source transmitting is incident in light valve and by its modulation, and the light after modulation projects on screen through projection lens and forms image.
The present invention also proposes a kind of projector equipment, comprises above-mentioned Projection Display ray machine.
In LED source of the present invention, the satisfied feature of loophole makes the facula position that light that light emitting diode sends forms after reflective surface reflection reach best mating with the position of light emitting diode, thereby has improved the efficiency that recycles of wide-angle light.
 
Accompanying drawing explanation
Figure 1A is the cutaway view of the first embodiment of LED source of the present invention;
Figure 1B is the top view of Figure 1A illustrated embodiment;
Fig. 1 C is the enlarged drawing of light emitting diode in Figure 1A illustrated embodiment;
Fig. 2 A has represented the selection of several possible special patterns;
Fig. 2 B has represented the transversal length of several special patterns in Fig. 2 A and the graph of a relation of angle;
Fig. 3 A has represented the shape of the loophole in another embodiment of the present invention;
Fig. 3 B has represented to use the flare schematic diagram of circular loophole;
Fig. 3 C has represented to use the hot spot schematic diagram of loophole in Fig. 3 A embodiment;
Fig. 4 has represented the structural representation of another embodiment of the present invention;
Fig. 5 has represented the structural representation of another embodiment of the present invention.
 
The specific embodiment
The present invention proposes a kind of LED source, and the cutaway view of its first embodiment as shown in Figure 1A.This LED source comprises light emitting diode 101, and this light emitting diode 101 comprises optical axis 110, the geometric center through lumination of light emitting diode face that this optical axis 110 is vertical.LED source also comprises the reflector 102 that covers light emitting diode 101 tops, the luminous light path of light emitting diode 101 is divided into emitting light path and reflected light path two parts by reflector 102, the reflective surface 102b that the light part that light emitting diode 101 sends is incident in reflector along reflected light path goes up and is reflected back light emitting diode (this part light represents for example with light 131 in the drawings) by it, and a part is along the direct outgoing of emitting light path (this part light represents for example with light 132 in the drawings).
Specifically, in the present embodiment, reflector 102 comprises that the loophole 102a at middle part is to form the emitting light path of light emitting diode 101, also comprises that loophole 102a reflective surface 102b is around to form the reflected light path of light emitting diode.The part that in the light that light emitting diode sends, the angle of emergence is larger is incident in reflective surface 102b along reflected light path, and the angle of emergence is passed loophole 102a and directly outgoing compared with little part along emitting light path.
Figure 1B is the top view of LED source in the present embodiment.The light-emitting area of visible light emitting diode (VLED) 101 is rectangle, its geometric center represents with 101a in the drawings, chain-dotted line 112 was the cross section of light emitting diode optical axis, the cutaway view of the LED source of what Figure 1A represented is exactly the present embodiment on this cross section, the reflective surface 102b in Figure 1A is expressed as the transversal on this cross section.In description, can repeatedly use the concept of the transversal of reflective surface, the face that this transversal referred to light emitting diode optical axis cuts produced transversal mutually with reflective surface, and such transversal is described " transversal of crossing light emitting diode optical axis " hereinafter.
In the present embodiment, the reflective surface 102b of reflector has following characteristics:
A) any one transversal of light emitting diode optical axis 110 is an oval part excessively, and this ellipse is according to light emitting diode optical axis 110 symmetries;
B) focal length of crossing any one transversal place ellipse of light emitting diode optical axis equals the transversal length on the equidirectional of outline of the light-emitting area of light emitting diode.
For instance, the reflecting surface that curved section 102b in Figure 1A is reflector is crossed the transversal of light emitting diode optical axis 110, this transversal 102b is an oval part, this ellipse is according to light emitting diode optical axis 110 symmetries, and its focal length equals the transversal length on the equidirectional of outline of the light-emitting area of light emitting diode, equal the length that in Figure 1B, light emitting diode 101 is cut by cross section 112, also equal the length of short sides of lumination of light emitting diode face.Fig. 1 C represented light emitting diode 101 light-emitting area overlook enlarged drawing, there are two intersection point 122a and 122b in its middle section 112 with its outline 121, the distance between these two intersection points just equals the oval focal length at the reflective surface 102b place in Figure 1A.Consider that this ellipse is according to light emitting diode optical axis 110 symmetries, therefore the some 122a on light emitting diode outline and 122b are exactly two focuses of this ellipse.
In conjunction with Figure 1A and 1C, known according to geometric knowledge and rim ray theory, on cross section 112, from the left focus of the left side end points 122b(ellipse of lumination of light emitting diode face) light that sends is incident in reflective surface 102b, will inevitably be reflected and be incident in the right focus of the right side end points 122a(ellipse of lumination of light emitting diode face), will inevitably be reflected and be incident in the right side end points 122a of lumination of light emitting diode face with the interior light sending from the left side end points 122b of lumination of light emitting diode face, vice versa.The light that enters into reflected light path sending from light emitting diode many light emitting diodes that turn back to of can trying one's best itself are so just guaranteed.These light that are reflected back can outgoing again after the reflection of reflective diode itself and scattering, and wherein a part is from the direct outgoing of emitting light path, and a part continues to enter reflected light path and circulates.Finally, wide-angle light is originally recycled and from low-angle emitting light path outgoing, thus the brightness that has improved LED source.
Give one example again in conjunction with Fig. 1 C.For the cross section 111 of crossing geometric center 101a, it is also ellipse with the transversal of reflective surface, and this oval focal length equals the distance between two intersection point 121a and the 121b of cross section 111 on the light-emitting area outline 121 of light emitting diode.Consider that this ellipse is according to light emitting diode optical axis 110 symmetries, therefore the some 121a on light emitting diode outline and 121b are exactly two focuses of this ellipse.As a same reason, on cross section 111, the light sending from the some 121a of light emitting diode can be reflexed to a 121b by reflective surface, can be reflexed in a 121b by reflective surface with the interior light sending from the some 121a of light emitting diode, and vice versa.
In sum, on all cross sections of crossing light emitting diode optical axis, the transversal of the reflective surface of reflector is all take two sections of lumination of light emitting diode face outline as focus, can guarantee that like this light that enters reflected light path sending from light emitting diode in all directions many light emitting diodes that is reflected back toward of all can trying one's best recycle, thereby farthest promote the luminosity of LED source.
Because crossing the transversal of light emitting diode optical axis, each of reflective surface all has difference and continually varying focal length, can guarantee that like this light can recycle efficiently in each cross section, the face type that also can guarantee whole reflective surface does not suddenly change and keeps smooth, so very convenient processing and assembling.In Fig. 2 B, the loophole 102a of reflector is circular, and reflector bottom surface profile 102c can obviously find out be not circular but on above-below direction larger approximate ellipsoidal, Here it is because the transversal focal length difference on different directions causes.
In embodiment, the feature that the reflective surface of reflector has is that all reflective surfaces all meet in the above.Even if in fact obviously partly meet and also there is beneficial effect.
In the above in embodiment, the feature b that the reflective surface of reflector has) in, the focal lengths of all transversal place ellipses of crossing light emitting diode optical axises equal the transversal length on the equidirectional of outline of the light-emitting area of light emitting diode.This might not be optimum in actual applications, is described in detail below.
Referring to Fig. 2 A, Fig. 2 A is the enlarged drawing of light emitting diode 201, and this light emitting diode is rectangle, and its short side direction is defined as x direction, and long side direction is defined as y direction, the geometric center that the intersection point of x axle and y axle is light emitting diode.This rectangular outline is 221, and its inscribed circle angular moment shape is 222, and connecing ellipse in rectangular is 223.Cross the arbitrary section 211 of geometric center, be made as with the angle of x axle
Figure 2014100489126100002DEST_PATH_IMAGE002
.Fig. 2 B has represented transversal length and the angle of three kinds of special patterns above that cross section 211 is cut
Figure 240775DEST_PATH_IMAGE002
relation, transversal length refers to the distance between two intersection points of cross section 211 and three kind of special pattern outline.In Fig. 2 B, abscissa is angle
Figure 889931DEST_PATH_IMAGE002
, ordinate is transversal length, 221,222 and 223 represent respectively rectangle outline, inscribed circle angular moment shape and in connect oval change curve.Dotted line 213 represents rectangular bond length, and dotted line 212 represents rectangular long edge lengths, exists according to the known three kinds of special patterns of Fig. 2 A
Figure 644260DEST_PATH_IMAGE002
be that the transversal length of 0 degree and 90 while spending all equals respectively rectangular minor face and long edge lengths, this shows as 221,222 identical with terminal with the starting point of 223 3 curves in Fig. 2 B, all originates in dotted line 213 and stops and dotted line 212.
Can be found out by Fig. 2 B, rectangular outline transversal change curve 221 is also unsmooth, the spike that has a maximum to the right at middle part, and this spike is in fact corresponding to rectangular cornerwise transversal length.In the time doing cross section along this diagonal, it is large that transversal length is given prominence to., in reality processing and actual effect, not now best.Visible, make the focal lengths of all transversal place ellipses of crossing light emitting diode optical axises equal the transversal length on the equidirectional of outline of the light-emitting area of light emitting diode, can run into the outstanding large problem of transversal length in diagonal.
In order to improve this problem, can use the inscribed circle angular moment shape of lumination of light emitting diode face outline, even the focal length of all transversal place ellipses of crossing light emitting diode optical axises equals the transversal length on the inscribed circle angular moment shape equidirectional of outline of the light-emitting area of light emitting diode.Known in conjunction with Fig. 2 B, the variation tendency 222 of the transversal length of inscribed circle angular moment shape is much level and smooth, does not have obvious spike.Facts have proved that this is optimum situation.As a same reason, also can adopt lumination of light emitting diode face in connect ellipse, even the focal length of all transversal place ellipses of crossing light emitting diode optical axises equal the light-emitting area of light emitting diode outline in connect the transversal length on oval equidirectional.The variation tendency 223 that inside connects oval transversal length is not only level and smooth, and its transversal length always changes between dotted line 212 and 213.
Therefore the feature b that, the reflective surface of reflector has) can change into:
B) focal length of crossing any one transversal place ellipse of light emitting diode optical axis equals the transversal length on the equidirectional of special pattern, wherein special pattern refer to the light-emitting area of light emitting diode outline, lumination of light emitting diode face outline in connect the inscribed circle angular moment shape of ellipse or lumination of light emitting diode face outline.
Further, the focal length of crossing the transversal place ellipse of light emitting diode optical axis also not necessarily equals the transversal length (being optimal situation in the time that oval focal length accurately equals the transversal length on special pattern equidirectional) on the equidirectional of special pattern accurately, but may have a scope.Entered experimental verification, the relation of the transversal length L on the focal length C of any one transversal place ellipse and the equidirectional of special pattern of light emitting diode optical axis is excessively: , now can guarantee that the efficiency that light is turned back to light emitting diode by reflector reaches the more than 90% of optimal situation.
In above-described embodiment, the light-emitting area of light emitting diode is rectangle, and the light emitting diode of in fact square light-emitting area is more popular.For this light emitting diode, application principle of the present invention with in embodiment above, describe identical, therefore repeated description not.But have be; for the light emitting diode of square light-emitting area; special pattern do not comprise lumination of light emitting diode face outline in connect ellipse; be evolved into circle because connect ellipse in foursquare; now the focal length of all transversal place ellipses of crossing light emitting diode optical axis all equates (equaling this diameter of a circle), and this does not belong to protection scope of the present invention.
In the above-described embodiments, reflector forms the emitting light path of light emitting diode with the loophole at middle part, forms the reflected light path of light emitting diode with loophole reflective surface around, and therefore the wide-angle light of light emitting diode is reflected.In actual applications, can certainly reflect low-angle light and turn back to light emitting diode, make the direct outgoing of wide-angle light simultaneously, as long as the reflective surface of reflector is arranged in middle part and makes surrounding space printing opacity.Obviously, if now the reflective surface of reflector has advantages of that the previously described feature of the present invention also utilizes light by having efficient circulation.Because low-angle light is easily collected, be therefore still positioned at reflector middle part with loophole in actual applications the most conventional with transmission low-angle light, but this is not construed as limiting the invention.In following other embodiment of the present invention, be still positioned at reflector middle part with loophole and illustrate with transmission low-angle light.
In the above-described embodiments, the loophole of reflector is circular, and this may not be optimal result.For the light emitting diode with rectangle light-emitting area, preferably, the transversal length of the loophole of reflector in all directions meets following characteristics: the transversal length of loophole on the long side direction of lumination of light emitting diode face is the longest, transversal on the short side direction of lumination of light emitting diode face is the shortest, transversal length gradual change between the transversal length on above-mentioned both direction according to the angle of its direction and above-mentioned both direction in other direction.Fig. 3 A has represented the top view of the reflector loophole that is applied to rectangle light emitting diode 301, and its loophole 302a is exactly the approximate ellipsoidal that meets above-mentioned condition, has also drawn the circular loophole 102a in the first embodiment in order to facilitate in comparison diagram.In Fig. 3 A, x direction of principal axis is lumination of light emitting diode face short side direction, and y direction of principal axis is long side direction, and visible transmission hole 302a is the shortest at the axial transversal of x, is made as X; Loophole is the longest at the axial transversal of y, is made as Y.The length of the transversal (transversal for example being cut by cross section 311) of other direction along with and the angle of x axle and y axle and gradual change between X and Y, be exactly particularly to increase gradually along with increasing and reduce transversal length with y axle clamp angle with x axle clamp angle in the present embodiment, more approach away from X gradually Y(this in Fig. 3 A can by with the finding out more easily of circular 102a because the transversal length of circular 102a is with isogonal).The loophole that meets above-mentioned feature has the profile of approximate ellipsoidal but might not be oval, for convenience, uses in the following description " approximate ellipsoidal " to describe the loophole of the reflector that meets above-mentioned feature.
Carefully analyzing approximate ellipsoidal loophole 302a in Fig. 3 A and the difference of circular loophole 102a can see, they with the normal direction on 321, variation have occurred with the section 322 that any one cross section 311 is cut respectively: the tangent line of the section 322 on approximate ellipsoidal loophole 302 is less compared with the tangent line of section 321 and the angle of y axle with the angle of y axle (the namely long side direction of lumination of light emitting diode face).This can be from satisfied strict the deriving of feature of previously described approximate ellipsoidal loophole: establish existence very close to another cross section 311 ' in cross section 311, cross section 311 ' is slightly little with the angle of y axle.Known according to geometric knowledge, circular loophole is equal in length at the transversal of two cross sections 311 and 311 ', and must be greater than the transversal length in cross section 311 according to the feature approximate ellipsoidal loophole 302a of approximate ellipsoidal loophole in the transversal length in cross section 311 ', therefore the tangential direction of section 322 and y axle clamp angle are less.
The beneficial effect of such loophole of the present embodiment illustrates in connection with Fig. 3 B and Fig. 3 C, Fig. 3 B is the reflected light distribution figure that uses the reflector of circular loophole, and Fig. 3 C is the reflected light distribution figure that uses the reflector of the approximate ellipsoidal loophole of the present embodiment.For the purpose of studying simply, in Fig. 3 B, only use the sub-fraction of reflector, in Fig. 3 B, be expressed as line segment 102a, this line segment 102a has represented a bit of (so because very little approximate the representing with straight line) on the loophole of reflector, and this bit of loophole has also referred to a reflective surface 102a simultaneously.The profile that in Fig. 3 B, white edge 301 is light emitting diode, hot spot 305 is that being incident in of sending from light emitting diode is reflected reflective surface 102a and planar forms hot spot at lumination of light emitting diode face and distribute.Obviously, flare has been no longer rectangle but through reflection distortion occurred, and its left side and downside all cannot incide in the light-emitting area of light emitting diode, and this part is exactly the light being wasted at light-emitting area light in addition.By comparison, the invariant position of light emitting diode in Fig. 3 C, and one section of 102a of circular loophole is changed into one section of 302a of approximate ellipsoidal loophole, according to the description of the preceding paragraph, known line segment 302a is less with respect to the long side direction angle of line segment 102a and light emitting diode, in the drawings line segment 302a and representative thereof a reflective surface with respect to line segment 102a and representative thereof a reflective surface there is counterclockwise rotation.In Fig. 3 C, also draw line segment 102a with dotted line for more convenient simultaneously.Be appreciated that according to reflection law, use this reflective surface 302a can make flare that counterclockwise rotation occurs and form new flare 352, its result be exactly in Fig. 3 B the light part slatterning of hot spot 351 left sides and downside enter in the region 301 of light emitting diode and become efficient light, although there is part and be positioned at LED area 301 light in addition in the upside of hot spot 352 and right side, but the light of this part waste is less than the efficient light entering from left side and downside, therefore more mate with light emitting diode the position of flare 352 in general, therefore the light that is reflected back light emitting diode is more.
Visible, the object that changes the shape of loophole in the present embodiment is not the shape that changes the flare of a certain section of reflective surface, but changing its position makes it more mate with the light-emitting area of light emitting diode.It should be noted that, in the present embodiment about being separate about the description of reflective surface transversal in the description of loophole shape and the first embodiment, the design that is each transversal of reflective surface can make to form the most suitable flare, the design of loophole shape can make the position of flare mate the most with light emitting diode, and these 2 difference can independent utility.That is to say, even if the feature that reflective surface does not meet the first embodiment a) and b), the transversal of for example reflective surface is a circular part, although or reflective surface transversal satisfies condition a) but its focus does not satisfy condition b), now the approximate ellipsoidal loophole in the present embodiment still can effectively be applied, and the supplementary features in the embodiment shown in Fig. 4 and Fig. 5 in simultaneously the following describes equally can additional application.
Be foursquare light emitting diode for light-emitting area, grow dividing of limit minor face, using circular loophole is exactly well to select.
The structural representation of an alternative embodiment of the invention as shown in Figure 4.Different from above-described embodiment, the LED source of the present embodiment also comprises the light collecting lens 405 that is positioned at reflector loophole place, and this light collecting lens for example, for collecting the light (light 432 of figure) from emitting light path outgoing.Light collecting lens 405 is directly installed on loophole and can makes compact conformation.Another difference of the LED source of the present embodiment and above-described embodiment is, light emitting diode 401 comprises light-emitting diode chip for backlight unit 401a and covers the wavelength conversion layer 401b on light-emitting diode chip for backlight unit, and the light that light-emitting diode chip for backlight unit 401a sends can make its transmitting Stimulated Light by excitation wavelength conversion layer 401b.
For example, light-emitting diode chip for backlight unit 401a launches blue light, and wavelength conversion layer 401b contains yellow or green emitting phosphor, wavelength conversion layer has absorbed blue light stimulated emission gold-tinted or green glow that light-emitting diode chip for backlight unit 401a sends, directly launches gold-tinted and green glow phase specific efficiency and cost so all more have superiority with light emitting diode.In this case, the light-emitting area of light emitting diode just refers to the upper surface of wavelength conversion layer, or wavelength conversion layer is as there being certain thickness layer, and its equivalent light-emitting area may be a face that is positioned at its inside.In fact the light-emitting area shape of light emitting diode is still the light-emitting area shape that is decided by light-emitting diode chip for backlight unit.In the present embodiment, wavelength conversion layer is higher than light-emitting diode chip for backlight unit for the reflection of light rate firing back from reflector, therefore compares direct use light-emitting diode chip for backlight unit and has the efficiency that higher light recycles.
The structural representation of an alternative embodiment of the invention as shown in Figure 5.Different from the embodiment shown in Fig. 4, the LED source of the present embodiment also comprises excitation source 506, and the exciting light 533 that this excitation source 506 sends is incident in the wavelength conversion layer 501b of light emitting diode and makes its stimulated emission Stimulated Light 532 along the opposite direction of emitting light path.Specifically, excitation source 506 is blue laser light source in the present embodiment, and the blue laser 533 that it sends can excite yellow or green wavelength conversion layer 501b.The light that light emitting diode sends sees through 505 outgoing of light collecting lens from emitting light path the most at last, and blue laser 533 equally can be along the reciprocal wavelength conversion layer 501b that is incident in of emitting light path.The LED source of the present embodiment also comprises light splitting optical filter 507, and it can reflect Stimulated Light 532 by transmission exciting light 533 simultaneously, therefore the light path of Stimulated Light 532 and the light path of exciting light 533 can be separated to make the efficient outgoing of Stimulated Light 532.Certainly light splitting optical filter 507 also can reflect exciting light 533 Stimulated Light of transmission simultaneously 532, as long as it can be by the two light path separately.Same, also can use other light-dividing device by the light path of exciting light 533 and Stimulated Light 532 separately, for example use the foraminate speculum in center, exciting light sees through aperture and is incident in wavelength conversion layer, 532 reflections of the reflecting surface from aperture surrounding of most of Stimulated Light.Light-dividing device has multiple choices in actual applications, does not limit herein.
The present invention also proposes a kind of Projection Display light source, comprises redness, green, blue three sub-light sources, the photosynthetic emergent light for a branch of this Projection Display light source of common formation that these three sub-light sources send.Wherein, the above-mentioned LED source of at least one sub-light source.
The present invention also proposes a kind of Projection Display ray machine, comprise above-mentioned Projection Display light source, also comprise light valve and projection lens, the emergent light of Projection Display light source transmitting is incident in light valve and by its modulation, and the light after modulation projects on screen through projection lens and forms image.
The present invention also proposes a kind of projector equipment, comprises above-mentioned Projection Display ray machine.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes description of the present invention and accompanying drawing content to do; 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 (9)

1. a LED source, is characterized in that:
Comprise that light-emitting area is rectangular light emitting diode, light emitting diode comprises optical axis, the geometric center through lumination of light emitting diode face that this optical axis is vertical;
Also comprise the reflector that covers light emitting diode top, the luminous light path of light emitting diode is divided into emitting light path and reflected light path two parts by reflector, the light part that light emitting diode sends is incident on the reflective surface of reflector and is reflected back light emitting diode by it along reflected light path, a part is along the direct outgoing of emitting light path; Reflector comprises that the loophole at middle part is to form the emitting light path of light emitting diode, also comprises that loophole reflective surface is around to form the reflected light path of light emitting diode;
Wherein, the transversal length of loophole in all directions meets following characteristics: the transversal length of loophole on the long side direction of lumination of light emitting diode face is the longest, transversal on the short side direction of lumination of light emitting diode face is the shortest, transversal length gradual change between the transversal length on above-mentioned both direction according to the angle of its direction and above-mentioned both direction in other direction.
2. LED source according to claim 1, is characterized in that, the reflective surface of reflector has following characteristics at least partly: any one transversal of crossing light emitting diode optical axis is an oval part, and this ellipse is according to light emitting diode light axial symmetry.
3. LED source according to claim 2, it is characterized in that, the reflective surface of reflector has following characteristics at least partly: the relation of the transversal length L on the focal length C of any one transversal place ellipse and the equidirectional of special pattern of light emitting diode optical axis is excessively:
Figure 2014100489126100001DEST_PATH_IMAGE002
, wherein special pattern refer to the light-emitting area of light emitting diode outline, lumination of light emitting diode face outline in connect the inscribed circle angular moment shape of ellipse or lumination of light emitting diode face outline.
4. LED source according to claim 1, is characterized in that, also comprises the light collecting lens at the loophole place that is positioned at reflector.
5. LED source according to claim 1, it is characterized in that, described light emitting diode comprises light-emitting diode chip for backlight unit and covers the wavelength conversion layer on light-emitting diode chip for backlight unit, and the light that light-emitting diode chip for backlight unit sends can make its transmitting Stimulated Light by excitation wavelength conversion layer.
6. LED source according to claim 5, is characterized in that, also comprises excitation source, and the exciting light that this excitation source sends is incident in the wavelength conversion layer of light emitting diode and makes its stimulated emission Stimulated Light along the opposite direction of emitting light path.
7. a Projection Display light source, is characterized in that, comprises redness, green, blue three sub-light sources, the photosynthetic emergent light for a branch of this Projection Display light source of common formation that these three sub-light sources send; Wherein, at least one sub-light source comprises the LED source described in any one in claim 1 to 7.
8. a Projection Display ray machine, it is characterized in that, comprise Projection Display light source claimed in claim 8, also comprise light valve and projection lens, the emergent light of Projection Display light source transmitting is incident in light valve and by its modulation, and the light after modulation projects on screen through projection lens and forms image.
9. a projector, is characterized in that, comprises Projection Display ray machine claimed in claim 9.
CN201410048912.6A 2014-02-12 2014-02-12 Light source with light emitting diode, projection display light source and projection display light machine Pending CN103822140A (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN107806572A (en) * 2016-09-04 2018-03-16 马田专业公司 Include the light fixture of light source, lenslet and retroreflector

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US20120051042A1 (en) * 2010-08-30 2012-03-01 Artsyukhovich Alexander N LED illuminator
CN103038566A (en) * 2010-04-01 2013-04-10 微阳有限公司 LED illumination System with recycled light
CN103502726A (en) * 2011-02-23 2014-01-08 瓦维恩股份有限公司 Light emitting diode array illumination system with recycling

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CN1177075A (en) * 1996-09-19 1998-03-25 杨维纲 Light condensing device
JP2011009021A (en) * 2009-06-25 2011-01-13 Takion Co Ltd Led lamp device
CN103038566A (en) * 2010-04-01 2013-04-10 微阳有限公司 LED illumination System with recycled light
US20120051042A1 (en) * 2010-08-30 2012-03-01 Artsyukhovich Alexander N LED illuminator
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Publication number Priority date Publication date Assignee Title
CN107806572A (en) * 2016-09-04 2018-03-16 马田专业公司 Include the light fixture of light source, lenslet and retroreflector

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Application publication date: 20140528