CN203732872U - Light-emitting device, projection display device and light-emitting system - Google Patents
Light-emitting device, projection display device and light-emitting system Download PDFInfo
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- CN203732872U CN203732872U CN201420006498.8U CN201420006498U CN203732872U CN 203732872 U CN203732872 U CN 203732872U CN 201420006498 U CN201420006498 U CN 201420006498U CN 203732872 U CN203732872 U CN 203732872U
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Abstract
The utility model provides a light-emitting device, a projection display device and a light-emitting system. The light-emitting device comprises a light-emitting diode (LED) light source, the light-emitting surface of the LED light source is rectangular, and directions of two adjacent sides of the rectangle are respectively x direction and y direction; and the light-emitting device also comprises a light collection lens used for collecting light emitted by the LED light source, the light collection lens at least comprises an optical curved surface, the shape of a cutting line passing through an optical axis in the x direction of the optical curved surface is different from that of a cutting line passing through an optical axis in the y direction, so that the focal length of the light collection lens in the x direction is different from the focal length of the light collection lens in the y direction. Amplification times of emitting light of the light-emitting device in two mutually perpendicular directions can be respectively controllable, so that the length breadth ratio of the emitting light cannot be limited by the LED light source, and the light-emitting device can be matched with an optical system at the back end of the light-emitting device through a reasonable design so as to improve efficiency.
Description
Technical field
The utility model relates to light source field, particularly relates to projection display equipment and the luminescent system of a kind of light-emitting device and this light-emitting device of use.
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 as a major issue of light source, because projection screen is generally the rectangle of 4:3 or 16:9, therefore light valve must match, and light valve is also the rectangle of 4:3 or 16:9.And the light-emitting area of light emitting diode is rectangle, its length breadth ratio often can not well be mated with the length breadth ratio of light valve.Like this, when the light that light emitting diode sends is imaged onto the modulation surface of light valve, in order to make whole modulation surface of light valve capped full, just have part light to be utilized in the image planes of light emitting diode, this has caused the loss of efficiency.
Summary of the invention
For above-mentioned problem, the utility model proposes a kind of light-emitting device, comprise LED source, the light-emitting area of this LED source is rectangle, the trend on two limits that rectangle is adjacent is respectively x direction and y direction; Also comprise light collecting lens, the light sending for collecting LED source; In this light collecting lens, at least comprise an optical surface, this optical surface is different with the shape of transversal of crossing optical axis in y direction at the transversal of crossing optical axis of x direction, make light collecting lens at the focal length of x direction from different at the focal length of y direction.
The utility model also proposes a kind of projection display equipment, comprises above-mentioned light-emitting device, also comprises Digital Micromirror Device light valve, and the light that light-emitting device sends is incident in Digital Micromirror Device light valve and carries image information through its modulation.
The utility model also proposes a kind of luminescent system, comprises above-mentioned light-emitting device, and receiving aperture and the receiving angle of the receiving optics of the aperture of the light beam that light-emitting device sends and angle and its rear end match.
The enlargement factor of the emergent light of light-emitting device of the present utility model in two orthogonal directions can be controlled respectively, the length breadth ratio of emergent light is not just subject to the restriction of LED source like this, and can match to raise the efficiency by the optical system of appropriate design and its rear end.
Brief description of the drawings
Fig. 1 a is the front elevation that the first embodiment of light-emitting device of the present utility model looks over from y direction;
Fig. 1 b is the front elevation that the first embodiment of light-emitting device of the present utility model looks over from x direction;
Fig. 1 c is the upward view of the first lens of the light collecting lens group of light-emitting device of the present utility model;
Fig. 2 a is the front elevation looking over from y direction of another embodiment of the utility model;
Fig. 2 b is the front elevation looking over from x direction of Fig. 2 a illustrated embodiment;
Fig. 3 a is the structural representation of another embodiment of the utility model;
Fig. 3 b is the vertical view of tore of reflection in Fig. 3 a illustrated embodiment;
Fig. 4 is the structural representation of another embodiment of the utility model;
Fig. 5 is the structural representation of another embodiment of the utility model;
Fig. 6 a is that in Fig. 5 embodiment, hypothesis is used in the x-direction and all hot spot schematic diagram of laser on wavelength conversion layer when identical light collecting lens of y direction;
The hot spot schematic diagram of laser on wavelength conversion layer when Fig. 6 b is the fast axle of laser along the less direction of light collecting lens focal length;
Fig. 6 c makes laser after the collimation lens out of focus hot spot schematic diagram on wavelength conversion layer on Fig. 6 b basis;
Fig. 7 is the principle of work schematic diagram of micro mirror in Digital Micromirror Device light valve.
Embodiment
The utility model proposes a kind of light-emitting device, the structural representation of its first embodiment is as shown in Fig. 1 a and 1b.This light-emitting device comprises LED source 101, and the light-emitting area of this LED source 101 is rectangle, and the trend on two limits that rectangle is adjacent is respectively x direction and y direction.Fig. 1 a has represented the front elevation that this light-emitting device looks over along the direction of y direction, and Fig. 1 b has represented the front elevation (seeing the coordinate system signal in the two figure lower left corners) that this light-emitting device looks over along x direction.The length that is appreciated that LED source 101 in Fig. 1 a is the length of side that its trend is x direction, and in Fig. 1 b, the length of LED source 101 is the length of side that its trend is y direction.Can obviously find out two length of side differences, therefore the light-emitting area of LED source is rectangle in this embodiment.In fact these two length of sides also can be identical, and light-emitting area such LED source is square.
Light-emitting device also comprises light collecting lens, and light collecting lens is light collecting lens group in the present embodiment, is jointly made up of two lens 102 and 103, and this light collecting lens group is for collecting the light that LED source 101 is sent.Lens 102 comprise and comprise successively two optical surface 102a and 102b along optical path direction, and optical surface 102a is concave surface, in the drawings with microgroove grid representation; Lens 102 comprise two optical surface 103a and 103b successively along optical path direction, and wherein optical surface 103b is with coarse groove grid representation.In the present embodiment, optical surface 102a has such feature with optical surface 103b: different with the shape of the transversal of crossing optical axis in y direction at the transversal of crossing optical axis of x direction.This can find out by comparison diagram 1a and Fig. 1 b.The width of the optical surface 102 in Fig. 1 a is obviously wide than the width of the optical surface 102 in Fig. 1 b, and lower protruding curve centered by the lower limb line 103c of optical surface 103b in Fig. 1 a, the curve of epirelief centered by the lower limb line 103c of optical surface 103b in Fig. 1 b, this illustrates that on the lens of circular aperture curved surface 103b is different with the transversal on y both direction at x, curvature along y direction is larger, and focal length is less.Further in Fig. 1 c, represent the upward view of optical surface 102a.
Be appreciated that because the existence in light collecting lens is at the x direction optical surface different with y side's upward curvature, this make light collecting lens at the focal length of x direction from different at the focal length of y direction.This further makes light collecting lens different with the enlargement factor on limit in the y-direction for the limit in the x-direction of LED source 101.Therefore, reasonably the design enlargement factor of light collecting lens in x direction and the enlargement factor in y direction just can be controlled the shape of the imaging of LED source on light valve, this shape can no longer be subject to the light-emitting area of LED source shape restriction and can reasonably mate with the length breadth ratio of light valve, with the maximization of implementation efficiency.
May not be also light valve but other light receiving element in actual applications in light-emitting device rear end, there is the restriction of bore or incident angle in this light receiving element to incident light.Light valve is the one in this conditional light receiving element, light valve is the restriction for the length breadth ratio of beam size, if the fly's-eye lens with rectangular element exists restriction for the ratio of the incident angle in two mutually orthogonal directions of incident beam.The length breadth ratio of the unit of for example fly's-eye lens is 4:3, the light beam that is incident in fly's-eye lens unit also should be approximately 4:3 in the dispersion angle ratio on length direction and cross direction, can form secondary lobe and can not be utilized if this ratio is not mated unnecessary Partial angle light.
For the control respectively of the curvature in x direction and y direction in light collecting lens, light collecting lens point other focal length on this both direction be can control, LED source emergent light point other dispersion angle or enlargement factor on this both direction further can be controlled.In fact dispersion angle is just corresponding to the imaging enlargement factor in far field, and therefore dispersion angle and enlargement factor are unified.
For instance, light-emitting diode chip for backlight unit is long 1.2mm in x direction, and long 2.0mm in y direction, if now use light collecting lens identical in x direction and y direction, can form hot spot or the dispersion angle that a length breadth ratio is 3:5 and compare the light beam for 3:5.This is obviously unmatched for the light valve that is 3:4 for length breadth ratio.Use smooth collecting lens of the present utility model, the enlargement factor of this light collecting lens in x direction is for example 2 times, in y direction, is for example 1.6 times, and can form like this length breadth ratio is that 2.4:3.2 is the hot spot of 3:4, just in time matches with the length breadth ratio of light valve.
In the present embodiment, light collecting lens group is made up of two lens, wherein has two optical surfaces not identical in x direction and y direction.In fact this just gives an example, and light collecting lens can be a slice lens, or the lens combination being made up of two above lens, and in light collecting lens, at least comprises that an optical surface is different in x direction and y direction.
In x direction or y direction, to be all that the light that LED source 101 is sent is collected due to light collecting lens, therefore preferred, light collecting lens coincides with the light-emitting area of LED source 101 in the focus of x direction and y direction, the collection efficiency on both direction is all higher like this.Due to the focal length difference of light collecting lens on both direction, therefore this means that light collecting lens is different with the principal plane locations in y direction in x direction.
The structural representation of another embodiment of light-emitting device of the present utility model is as shown in Fig. 2 a and 2b, wherein Fig. 2 a has used the identical coordinate system of Fig. 1 a, and Fig. 2 b has used the coordinate system identical with Fig. 1 b, be that Fig. 2 a is the front elevation looking over along y direction, Fig. 2 b is the front elevation looking over along x direction.Different from the embodiment shown in Fig. 1 a and 1b, in the light-emitting device of this embodiment, also comprise light retracting device 205, be reflected back light emitting diode light source 201 for the light of part shooting angle that light emitting diode light source 201 is sent.
Specifically, light retracting device 205 is the reflector 205 in LED source that is covered between LED source 201 and the light path of light collecting lens in the present embodiment, the inwall of this reflector 205 is reflecting surface 205a, can reflect the wide-angle light (for example light 212) that LED source 201 is sent, and the opening that all the other angular light (for example light 211) can transmission reflector top and being collected by light collecting lens normally.It is rear by LED source 201 scatterings and reflection and in this outgoing that the light 212 being reflected by reflector 205 is got back to LED source 201, wherein the light of smaller angle can be collected by light collecting lens, and wide-angle light is reflected by reflector again, most of light that so after circulation repeatedly, LED source is sent can be concentrated in the smaller angle at center and be collected by light collecting lens.Such benefit is to have been compressed by high efficiency because the effect of reflector makes the angle of divergence of light, and this contributes to reduce the optical extend of light beam and improves brightness.
Further, in the present embodiment, comparison diagram 2a and Fig. 2 b can find out, the A/F on reflector top different in x direction and y direction, and this is in fact corresponding to light collecting lens different receipts optic angle degree in x direction and y direction.The opening of visible reflector can adjust according to the design of light collecting lens, if the catoptrical emergence angle scope of reflector institute is also thereupon different for the receipts optic angle degree difference of the latter on both direction.For example, light collecting lens is collected 60 degree in x direction, collects 45 degree in y direction, and reflector just reflects the light of 60 degree to 90 degree in x direction, reflects the light of 45 degree to 90 degree in y direction.Can farthest utilize like this luminous energy.
In the embodiment shown in Fig. 2 a and 2b, light retracting device is reflector, and actual glazing retracting device can be also the optical element of other form.For example, in another embodiment of the present utility model, as shown in Figure 3 a, light retracting device in this light-emitting device is the tore of reflection 305 that is positioned at light collecting lens inside, the wide-angle light 312 sending from LED source 301 is incident in tore of reflection 305 after first collecting lens, and is reflected back first collecting lens and is finally incident in LED source 301 surfaces by it.The vertical view of tore of reflection 305 as shown in Figure 3 b.The position of tore of reflection also can be positioned at the light path rear end of light collecting lens, shown in embodiment as shown in Figure 4, the wide-angle light 412 that LED source 401 is sent is incident in tore of reflection 405 after light collecting lens is collected and collimated, and is reflected after ring 405 reflects and again gets back to LED source surface.Fig. 3 a and the size compared with the reflector shown in Fig. 2 a of the tore of reflection shown in Fig. 4 are easier to more greatly processing, and its transversal can be straight line or curve, but that its shortcoming is to be reflected back the light of LED source is less, and therefore efficiency is slightly low.
The structural representation of another embodiment of light-emitting device of the present utility model as shown in Figure 5, differently from above-described embodiment be in this embodiment, LED source 501 comprises light-emitting diode chip for backlight unit and is covered in the wavelength conversion layer on light-emitting diode chip for backlight unit surface, the optical excitation wavelength conversion layer transmitting Stimulated Light that light-emitting diode chip for backlight unit sends; Also comprise LASER Light Source 506, the laser 513 that LASER Light Source 506 is sent is incident in wavelength conversion layer from the top of wavelength conversion layer and makes it produce Stimulated Light 511 after light collecting lens.The top of wavelength conversion layer herein refers to the light exit direction of the Stimulated Light that wavelength conversion layer produces.
Light and the laser 513 that can be sent by light-emitting diode chip for backlight unit due to wavelength conversion layer excite from both direction simultaneously, and therefore its brightness is larger.In the present embodiment, also comprise that collimation lens 507 is used to LASER Light Source collimation, can omit if the light that LASER Light Source itself is sent has enough collimated collimation lens 507.The light-emitting device of the present embodiment also comprises light splitting optical filter 508, reflect Stimulated Light 511 for transmission laser 513 simultaneously, can guide like this Stimulated Light 511 of outgoing and the light path of laser 513 to be separated, place Stimulated Light 511 and be incident on laser 506 and cause loss in efficiency.In actual applications, light splitting optical filter can also be other light-dividing device, the catoptron that for example center is with holes, this catoptron guiding laser 506 from hole through guide Stimulated Light catoptron reflection around from hole simultaneously.Light-dividing device is prior art, has a lot of patent files and document can describe this problem in detail, does not therefore repeat herein.
If light collecting lens is identical with y direction in x direction, laser 513 be incident in that wavelength conversion layer forms hot spot will be a strip, as shown in Figure 6 a.Fig. 6 a is the vertical view of wavelength conversion layer 601, and hot spot 613 is laser 513 formed hot spot incident thereon.Why hot spot 613 is strip is mainly to be determined by the characteristic of laser itself.The angle of the quick shaft direction of laser is large, and slow axis angle is little a lot, and therefore quick shaft direction is exactly the long side direction of this strip hot spot.Preferably, in the present embodiment, the quick shaft direction of the laser that LASER Light Source is sent is parallel to the shorter direction of focal length of light collecting lens in x direction and y direction.The light of quick shaft direction will more be compressed like this, and such formed hot spot is as shown in the 613b in Fig. 6 b.Now can, by collimation lens 507 out of focus being made to the amplification of hot spot 613b equal proportion, obtain as the hot spot 613c in Fig. 6 c.Compared with hot spot 613a in Fig. 6 a, the long axis length of hot spot 613c is identical, large but minor axis becomes, and therefore facula area becomes large, the conversion efficiency that this is conducive to reduce the optical power density of laser and improves wavelength conversion layer.
Obviously the outgoing brightness that the light retracting device in the embodiment of the present embodiment shown in also can application drawing 2a to Fig. 4 improves light.
The utility model also proposes a kind of projection display equipment, comprise above-mentioned light-emitting device, also comprise Digital Micromirror Device (digital micro-mirror device, DMD) light valve, the light that light-emitting device sends is incident in Digital Micromirror Device light valve and carries image information through its modulation.
As shown in Figure 7, turning axle 782 trends of micro mirror 781 are u direction to the schematic diagram of the micro mirror in Digital Micromirror Device light valve.Micro mirror 781 overturns in the plane perpendicular to u direction, its flip angle scope is very little, be generally positive and negative 12 degree, this has also just limited the angle of divergence of the light cone that is incident in Digital Micromirror Device light valve, if spend micro mirror 781 and be just not enough to by upset, incident light be separated with catoptrical light cone because the angle of divergence is greater than positive and negative 12.
That is to say, just limit the angular range of incident light light cone in reverses direction just because of the upset of micro mirror 781, so in fact, the angular range of incident light light cone in the trend (being u direction) of axle unrestricted, on u direction, the angle of divergence of input ray pencil can be greater than positive and negative 12 degree.Be appreciated that the larger light that can enter light valve of allowed incident angle is just more, projected image is just brighter.Utilize this point, utilize light that in the utility model, light-emitting device sends in two vertical dimensions, can distinguish the feature of control ratio, the light cone 711 that the light that can make light-emitting device send is incident in Digital Micromirror Device light valve is greater than the angle of divergence on perpendicular to u direction in the angle of divergence of u direction, can improve like this brightness.
The utility model also proposes a kind of luminescent system, it is characterized in that, comprises above-mentioned light-emitting device, and receiving aperture and the receiving angle of the receiving optics of the aperture of the light beam that light-emitting device sends and angle and its rear end match.
The foregoing is only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model instructions 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 utility model.
Claims (10)
1. a light-emitting device, is characterized in that:
Comprise LED source, the light-emitting area of this LED source is rectangle, and the trend on two limits that rectangle is adjacent is respectively x direction and y direction;
Also comprise light collecting lens, the light sending for collecting LED source; In this light collecting lens, at least comprise an optical surface, this optical surface is different with the shape of transversal of crossing optical axis in y direction at the transversal of crossing optical axis of x direction, make light collecting lens at the focal length of x direction from different at the focal length of y direction.
2. light-emitting device according to claim 1, is characterized in that, light collecting lens coincides with the light-emitting area of LED source in the focus of x direction and y direction.
3. light-emitting device according to claim 1, is characterized in that, also comprises light retracting device, is reflected back light emitting diode light source for the light of part shooting angle that light emitting diode light source is sent.
4. light-emitting device according to claim 3, is characterized in that:
Described smooth retracting device is the reflector in LED source that is covered between LED source and the light path of light collecting lens; Or,
Described smooth retracting device is the tore of reflection that is positioned at light collecting lens inside or light path rear end.
5. light-emitting device according to claim 3, is characterized in that, described smooth retracting device is different in the emergence angle scope of the light reflecting of x direction and y direction.
6. light-emitting device according to claim 1, it is characterized in that, LED source comprises light-emitting diode chip for backlight unit and is covered in the wavelength conversion layer on light-emitting diode chip for backlight unit surface, the optical excitation wavelength conversion layer transmitting Stimulated Light that light-emitting diode chip for backlight unit sends; Also comprise LASER Light Source, the laser that LASER Light Source is sent is incident in wavelength conversion layer from the top of wavelength conversion layer and makes it produce Stimulated Light after light collecting lens.
7. light-emitting device according to claim 6, is characterized in that, the quick shaft direction of the laser that LASER Light Source is sent is parallel to the shorter direction of focal length of light collecting lens in x direction and y direction.
8. a projection display equipment, is characterized in that, comprises the light-emitting device described in any one in claim 1 to 7, also comprises Digital Micromirror Device light valve, and the light that light-emitting device sends is incident in Digital Micromirror Device light valve and carries image information through its modulation.
9. projection display equipment according to claim 8, it is characterized in that, micro mirror turning axle in Digital Micromirror Device light valve trend is u direction, and the light cone that the light that light-emitting device sends is incident in Digital Micromirror Device light valve is greater than the angle of divergence on perpendicular to u direction in the angle of divergence of u direction.
10. a luminescent system, is characterized in that, comprises the light-emitting device described in any one in claim 1 to 7, and receiving aperture and the receiving angle of the receiving optics of the aperture of the light beam that light-emitting device sends and angle and its rear end match.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420006498.8U CN203732872U (en) | 2014-01-06 | 2014-01-06 | Light-emitting device, projection display device and light-emitting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420006498.8U CN203732872U (en) | 2014-01-06 | 2014-01-06 | Light-emitting device, projection display device and light-emitting system |
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| Publication Number | Publication Date |
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| CN203732872U true CN203732872U (en) | 2014-07-23 |
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| CN201420006498.8U Expired - Lifetime CN203732872U (en) | 2014-01-06 | 2014-01-06 | Light-emitting device, projection display device and light-emitting system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777450A (en) * | 2014-01-06 | 2014-05-07 | 吴震 | Light emitting device, projection display device and light emitting system |
| CN109581669A (en) * | 2019-01-23 | 2019-04-05 | 歌尔股份有限公司 | Projecting light path and wear display equipment |
-
2014
- 2014-01-06 CN CN201420006498.8U patent/CN203732872U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777450A (en) * | 2014-01-06 | 2014-05-07 | 吴震 | Light emitting device, projection display device and light emitting system |
| CN109581669A (en) * | 2019-01-23 | 2019-04-05 | 歌尔股份有限公司 | Projecting light path and wear display equipment |
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Granted publication date: 20140723 |