CN101806990A - Projecting device with high light-engine efficiency - Google Patents
Projecting device with high light-engine efficiency Download PDFInfo
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- CN101806990A CN101806990A CN 201010156089 CN201010156089A CN101806990A CN 101806990 A CN101806990 A CN 101806990A CN 201010156089 CN201010156089 CN 201010156089 CN 201010156089 A CN201010156089 A CN 201010156089A CN 101806990 A CN101806990 A CN 101806990A
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Abstract
The invention relates to a projecting device with high light-engine efficiency for projecting image information onto a surface. The projecting device comprises a light source module, a light source synthesizer, a lighter source homogenizer, an illuminating lens set, a reflecting type image generator and an image projecting mirror set. Through an inverse total reflection type telecentric optical framework, the invention definitely can provide a projecting device or module with smaller size or volume and high optical-mechaical efficiency, provide a miniature projecting device or module for realizing conjugate imaging and also provide a miniature projectin device or module with two paths of LED light sources.
Description
Technical field
The relevant a kind of projection arrangement of the present invention is especially relevant for light path (journey) design of little projection arrangement of high light-engine efficiency.
Background technology
Projection arrangement extends to home-use even personal portable market by enterprise with produce market in recent years.And portable product is used, and except that the volume of reduced projection device, improves ray machine efficient, also is the direction that each manufacturer makes great efforts.
For reduced volume, little projection arrangement adopts the design of led light source module single light path more, but its shortcoming is a luminance shortage.If but improve brightness, and when utilizing two above light source modules to adopt splicers (dichroiccombiner) to form single light path, effective reduced volume.For example, U.S. patent application case US2006/0279710A1, US2006/0164600A1 or United States Patent (USP) are checked and approved the light mode of closing that case US6644814B2 is adopted, and can cause bigger projection arrangement size.Therefore, micro projector or the module that needs volume and ray machine efficient to take into account arranged really on the market.
Be the ray machine efficient of taking into account minitype projection machine and the optimization of volume size thereof, must obtain the balance of following design conditions usually: 1. the light source light path is few more good more, and 2. optical design must be satisfied conjugate imaging as far as possible, 3. its light path folding is become minimum volume.
Summary of the invention
One of fundamental purpose of the present invention provides the projection arrangement or the module of small size and tool high light-engine efficiency.
Another object of the present invention provides micro projector or the module of realizing conjugate imaging.
A further object of the present invention provides the micro projector or the module of two light path led light sources.
Above-mentioned purpose of the present invention is reached by the contrary total-reflection type heart far away (telecentric) optics framework.
Specifically, contrary total-reflection type telecentric optics framework comprises the prism group, wherein the prism group comprises first prism, this first prism has key light input face and key light output face, angle between key light input face and vertical reference face is first angle, angle is second angle between this key light output face and this vertical reference face, this first angle is about 28 (± 3) degree and this second angle is about 32 (± 3) degree, satisfy the desired photograph of this reflective image generator (going into) firing angle degree on the one hand, can reduce height (thick) degree (the being the Y direction) difference between prism group and reflective image generator on the other hand.
That is, in order to reach the foregoing invention purpose, projection arrangement of the present invention, for the image information is projected on the surface, comprise: the light source module, comprise first light source, secondary light source, the first light source modulation mirror, secondary light source modulation mirror, this first light source is the first modulation light source behind this first light source modulation mirror, and this secondary light source is the second modulation light source behind secondary light source modulation mirror; The light source compositor is the first single light path for synthetic this first modulation light source, this second modulation light source, this first light path definition first direction; The even device of light source is for making this first light path homogenising; The illuminating lens group will be directed to second light path for first light path of this homogenising; Reflective image generator is for forming this image information; The prism group is directed to this reflective image generator with second light path, wherein, after this reflective image generator reflects this second light path, forms the 3rd light path with this image information, and the 3rd light path produces the 4th light path after this prism group reflection; Image projecting image set, be positioned on the 4th light path, this image information is projected on this surface, wherein the formed light path of this secondary light source defines second direction, this second direction is approximately perpendicular to this first direction, and with respect to this second direction, this secondary light source is arranged between this first light source and the image projecting image set, wherein this illuminating lens group illuminating lens group according to imaging formula make the light source that is distributed on the even device of this light source in fact conjugate imaging in image projecting image set.
Except above-mentioned first embodiment, the invention provides a kind of projection arrangement of second embodiment, for the image information is projected on the surface, comprise: the light source module, it comprises first light source, secondary light source, the first light source modulation mirror, secondary light source modulation mirror, first light source irradiation, the first light source modulation mirror and export the first modulation light source, secondary light source irradiation secondary light source modulation mirror and export the second modulation light source; The light source compositor supplies this first modulation light source, the second modulation light source are synthesized, and produces the first single light path, and this first light path definition vertically; The even device of light source for this first light path of input, applies uniformization effect with the light of first light path; The illuminating lens group, for first light path of input through uniformization effect, first light path is directed to second light path, form angle between this first light path and this second light path, this illuminating lens group comprises first illuminating lens, directional introducer and second illuminating lens, directional introducer is directed to second light path in order to first light path just, and the focal length of first illuminating lens is f1, and the focal length of second illuminating lens is f2; Reflective image generator is for forming this image information; The prism group after this second light path of input, is projected to reflective image generator with second light path, wherein, reflective image generator forms the 3rd light path with this image information after second light path is reflected, the 3rd light path produces the 4th light path after this prism group reflection; Image projecting image set, be positioned on the 4th light path, for this image information is projected on this surface, wherein the emitted light path of this secondary light source defines laterally, this laterally is approximately perpendicular to this first light path, and it is horizontal with respect to this, this secondary light source is arranged between this first light source and the image projecting image set, wherein this illuminating lens group illuminating lens group according to imaging formula make the light source that is distributed on the even device of this light source in fact conjugate imaging in image projecting image set, wherein the effective lens distance between first illuminating lens and second illuminating lens is d, this light source module produces first virtual light source on the outgoing side of the even device of this light source, this imaging formula is: this first virtual light source places in the focal distance f 1 of this first illuminating lens, make the virtual image of second virtual light source of its generation and the first virtual light source homonymy, the position that this second virtual light source is set up is the D value apart from this second illuminating lens, wherein this D value is more than a times of this f2, twice following (f2＜D＜2f2), so make this virtual light source in fact conjugate imaging in image projecting image set.
By contrary total-reflection type telecentric optics framework, the present invention can provide the projection arrangement or the module of size or lessization of capacity and tool high light-engine efficiency really, micro projector or the module of realizing conjugate imaging also can be provided, the micro projector or the module of two light path led light sources also can be provided.
Can be further understood by following description of drawings and embodiment detailed description in the advantages and spirit of the present invention.
Description of drawings
Fig. 1 is the projection arrangement of the embodiment of the invention.
Fig. 2 a is the stereographic map of first prism in the embodiment.
Fig. 2 b is the right side view of first prism in the embodiment.
Fig. 2 c is that the top side of first prism in the embodiment is looked.
Fig. 3 is that the micro lens of first of the even device of light source is designed to image in the image generator in the specific embodiment of the invention.
Fig. 4 is the first multiple virtual light source of the even device outgoing side of light source in the specific embodiment of the invention.
Fig. 5 is that the 3rd multiple virtual light source at projection lens group entrance pupil place produces imaging in the specific embodiment of the invention.
Embodiment
Below with reference to accompanying drawing each embodiment of the present invention is further specified.Though the present invention combines embodiment and describes, be to be understood that the present invention can have multiple mode to implement, and be not limited only to disclosed embodiment here; Embodiment provided by the invention makes the present invention openly more fully with complete, and makes that those skilled in the art can scope on top of of the present invention.
The projection arrangement of first embodiment of the invention, for being used for the image information is projected to a surface, for the content popular or projection of individual's reading institute, this projection arrangement can constitute the projector of individualism, be able to also that the module mode exists and with other portable apparatus, mobile phone for example is integrated into one and becomes portable compounding machine device, for example has the mobile phone of projecting function.
In the following description, so-called " light path (journey) " means path and the trimmed book body that light passes through, the trimmed book body may not comprise any information, also may be because comprise information through handling (for example through the reflective image generator reflection), for going up projection in a surface.And in order to allow the diagram readability, the light path in the diagram only illustrates the chief ray of light source, and all the other light are not drawn.In addition, in the following description, so-called " conjugate imaging " means, and the output pupil plane of upper level optical lens images in the input pupil plane of next stage optical lens in fact.
As shown in Figure 1, can fertile add ons except other known elements or future, the projection arrangement 100 of first embodiment of the invention comprises light source module 110, comprise first light source (for example green glow G of LED), secondary light source (for example the ruddiness R of LED and blue light B), the first light source modulation mirror (for example, but be not limited to, comprise collimation lens 115A, 117A), secondary light source modulation mirror (for example, but be not limited to, comprise collimation lens 115B, 117B), this first light source is the first modulation light source L00 behind this first light source modulation mirror, and this secondary light source is the second modulation light source L01 behind secondary light source modulation mirror.
Projection arrangement 100 further comprises light source compositor 111, is the first single light path L10 for synthetic this first modulation light source L00, this second modulation light source L01, and this first light path L10 defines first direction.
Projection arrangement 100 further comprises the even device of light source (beam homogenizer) 120, with homogenising (uniform) the first light path L10.
Projection arrangement 100 further comprises illuminating lens group (illumination lens) 130, for the first light path L10 of input through uniformization effect, the first light path L10 is directed to the second light path L13 again, forms angle between this first light path L10 and this second light path L13.
Projection arrangement 100 further comprises reflective image generator 160, for forming this image information thereon; And prism group 140, behind this second light path of input L13, the second light path L13 is projected to reflective image generator 160, wherein, after reflective image generator 160 reflects the second light path L13, formation has the 3rd light path L15 of this image information, and this 3rd light path L15 with this image information produces the 4th light path L17 with this image information after these prism group 140 total reflections.
Projection arrangement 100 further comprises image projecting image set 170, is positioned on the 4th light path L17, for this image information on the 4th light path L17 is projected on the surface.
As shown in Figure 1, in order to improve the brightness of light source, led light source adopts the two-way light source respectively, and G light source one tunnel, B light source and R light source one tunnel, two-way light source form the first single light path L10 then via splicer 111.
Light source azimuth modulation module (115A, 117A are with 115B, 117B) is imported this light G respectively, (R, B) the source light of giving birth to, and output light path L00, L01.About the distribution of irradiating angle, the light on output light path L00, the L01 has suitable and distributes uniformly, and this is main effect, the function of light source azimuth modulation module.The embodiment of light source azimuth modulation module comprises commonly used, known collimation lens (collimator).
In some embodiment, the respective optical path L00 of first light source of light source is roughly parallel to this first light path L10, and the respective optical path L01 of the secondary light source of this light source module is approximately perpendicular to this first light path L10, and the light source azimuth modulation module of secondary light source and collocation places between this first light source and the image projecting image set 170, as shown in Figure 1.
Under Fig. 1 embodiment, in some embodiment, the even device 120 of light source comprises micro-lens array (lenslet array), and micro-lens array forms light input plane 120I and light output plane 120J, and light input plane 120I images on the reflective image generator 160.As be familiar with known to this skill personage, micro-lens array comprises conplane a plurality of micro lens, and each micro lens generally has identical focal length (focal length).
Under Fig. 1 embodiment, in some embodiment, the radius-of-curvature of each micro lens in the micro-lens array is approximately less than 2, so that obtain preferable homogenising (uniform) effect.After the first light path L10 leaves the even device 120 of light source, i.e. incident illumination lens combination (illumination lens set) 130 is directed to the second light path L13 again with the first light path L10, forms angle between this first light path L10 and this second light path L13.
Illuminating lens group 130 mainly comprises first illuminating lens 131, second illuminating lens 135 and directional introducer 133 (such as but not limited to mirror surface).As be familiar with known to this skill personage, the distribution that mainly the acting on of first illuminating lens 131, second illuminating lens 135 makes light illumination intensity (intensity) is (evenness) as much as possible evenly, and make inhomogeneous (unevenness) part of low illumination intensity, reduce as best one can.The embodiment of first illuminating lens 131 or second illuminating lens 135 can adopt known collector lens (condenser lens), can make the optical axis of parallel this projection arrangement of chief ray, and side-play amount reduces.Directional introducer 133 is directed to the second light path L13 in order to the first light path L10 just.
Under Fig. 1 embodiment, in some embodiment, prism group 140 comprises first prism 141, and wherein this first prism 141 has key light input face S
BWith key light output face S
D, shown in Fig. 2 a, 2b, 2c.Key light input face S
BWith vertical reference face S
RBetween angle be first angle, this key light output face S
DWith this vertical reference face S
RBetween angle be second angle, this first angle is about 28 degree (± 3 degree) and this second angle is about 32 degree (± 3 degree), to satisfy this desired illumination of reflective image generator 160 specifications (going into) firing angle degree.Under figure one embodiment, in some embodiment, prism group 140 comprises second prism 143, and wherein this second prism 143 is total-reflection type (total internal reflection--TIR) prism.After the cause second light path L13 penetrates first prism 141 earlier, reflection through reflective image generator 160, form the 3rd light path L15 after obtaining the projection information, the 3rd light path L15 forms the 4th light path L17 through the total reflection of second prism 140 again, the framework that this prism group 140 is employed thereby can be referred to as contrary total-reflection type (the retrototal internal reflection) heart (telecentric) optics framework far away.
Shown in the embodiment of first prism 141 among Fig. 2 a, 2b, the 2c, light is by input face S
BEnter, by output face S
DPenetrate, the disclosed design parameter of this first prism 141 (and/or first prism 143), it only is preferred implementation, mainly be to satisfy reflective image generator 160 desired illumination (going into) firing angle degree on the one hand, can reduce the difference of height (thick) degree (being the Y direction) of 160 of prism group 140 and reflective image generator on the other hand.
Get back to Fig. 1, under Fig. 1 embodiment, in some embodiment, this reflective image generator 160 comprises DMD Digital Micromirror Device (digital micromirrors device--DMD).Reflective image generator 160 the place aheads can be arranged image field lens (field lens) 150 usually, and the major function of image field lens 150 is to increase the visual angle.
Get back to Fig. 1, the 3rd light path L15 with projection information forms the 4th light path L17 after the total reflection of second prism 143, and this 4th light path L17 is by after the image projecting image set 170, and data is projected onto on the plane.Image projecting image set 170 generally comprises the lens of a plurality of difference in functionalitys, reaches the function of correct amplification and projection.
Also because the aforesaid goal of the invention of the present invention is reached in above-mentioned exposure about Fig. 1, Fig. 2 a, Fig. 2 b, Fig. 2 c embodiment.
Below by Fig. 3,4,5, narrate optical design of the present invention and how to reach conjugate imaging.
Comprise (right certainly) even device 120 of light source, first illuminating lens 131, second illuminating lens 135, prism group 140, reflective image generator 160 among Fig. 3 by a left side, Fig. 3 is effective light path path profile of Fig. 1, shows that effective optical path length of 135 of first illuminating lens 131 and second illuminating lenss is d.Fig. 3 is designed to image in this image generator 160 for the micro lens that discloses the even device 120 input face 120I of light source in addition.For can conjugate imaging in projection lens's group 170, the spacing d of 135 of first illuminating lens 131 and second illuminating lenss need effectively draw back in this illuminating lens group 130.For effectively utilizing this space of drawing back generation (with the rough vertical direction of light path L10), the present invention with secondary light source (R, B) and its light source azimuth modulation module (115B, 117B) place between first light source (G) and the image projecting image set 170.
Fig. 4 discloses the first multiple virtual light source at the even device of light source 120 outgoing side 120J places.When light emitted light through light source azimuth modulation mirror group (115A, 117A, 115B, 117B) be tuned as the light source of approximate directional light after, through light source compositor 111 two light sources are synthesized the first light path L10.Light source produces virtual light source more than first on the outgoing side 120J of this even device.And this virtual light source more than first images near the input pupil of first illuminating lens 131 through this illuminating lens group, and this virtual light source more than first is positioned at the focal length (f1) of first illuminating lens 131, make its produce with (void) of the virtual light source more than second of the homonymy of virtual light source more than first (is benchmark with first illuminating lens 131) as.In other words, (void) image distance of virtual light source more than second is from the distance D of second lens 135, and wherein D is greater than d.Imaging formula of the present invention (i.e. relation) is, this D value is the following (f2＜D＜2f2) of more than a times of this f2, twice, conjugate imaging is in image projecting image set in fact so to make this second virtual light source, i.e. focusing forms virtual light source more than the 3rd near the entrance pupil of image projecting image set.
Fig. 5 promptly discloses projection lens's group 170 entrance pupil places and focuses on the 3rd multiple virtual light source imaging that forms.
By above each graphic better embodiment of the present invention, can learn that therefore each purpose of the present invention or effect have all obtained realization.That is, by contrary total-reflection type telecentric optics framework, the present invention can provide the projection arrangement or the module of size or lessization of capacity and tool high light-engine efficiency really, and micro projector or the module of realizing conjugate imaging also can be provided, and the micro projector or the module of two light path led light sources also can be provided.
According to the detailed description of above embodiment, hope can be known description feature of the present invention and spirit more, and is not to come the present invention is limited with above-mentioned disclosed embodiment.
Claims (10)
1. a projection arrangement supplies the image information is projected on the surface, it is characterized in that this projection arrangement comprises:
The light source module comprises first light source, secondary light source, the first light source modulation mirror, secondary light source modulation mirror, and this first light source is the first modulation light source behind this first light source modulation mirror, and this secondary light source is the second modulation light source behind secondary light source modulation mirror;
The light source compositor is the first single light path for synthetic this first modulation light source, this second modulation light source, this first light path definition first direction;
The even device of light source is for making this first light path homogenising;
The illuminating lens group will be directed to second light path for first light path of this homogenising;
Reflective image generator is for forming this image information;
The prism group is directed to this reflective image generator with second light path, wherein, after this reflective image generator reflects this second light path, forms the 3rd light path with this image information, and the 3rd light path produces the 4th light path after this prism group reflection;
Image projecting image set, be positioned on the 4th light path, this image information is projected on this surface, wherein the formed light path of this secondary light source defines second direction, this second direction is approximately perpendicular to this first direction, and with respect to this second direction, this secondary light source is arranged between this first light source and the image projecting image set, and wherein this illuminating lens group illuminating lens group makes the light source energy conjugate imaging that is distributed on the even device of this light source in image projecting image set according to imaging formula.
2. projection arrangement according to claim 1 is characterized in that: the even device of this light source comprises micro-lens array, and this micro-lens array forms the light input plane, and this light input plane images on this reflective image generator.
3. projection arrangement according to claim 1, it is characterized in that: this prism group comprises first prism, wherein this first prism has key light input face and key light output face, angle between key light input face and vertical reference face is first angle, angle is second angle between this key light output face and this vertical reference face, the scope of this first angle is that 25 degree to 31 degree and the scope of this second angle are that 29 degree are to 35 degree, to satisfy the desired irradiating angle of this reflective image generator.
4. projection arrangement according to claim 3 is characterized in that: this first angle is that 28 degree and this second angle are 32 degree.
5. projection arrangement according to claim 1 is characterized in that: this prism group comprises second prism, and wherein this second prism is the total-reflection type prism.
6. projection arrangement according to claim 1, it is characterized in that: this illuminating lens group comprises first illuminating lens, directional introducer and second illuminating lens, this directional introducer is in order to be directed to this second light path with this first light path, wherein have optical path length between this first illuminating lens and this second illuminating lens, this optical path length makes this image information energy conjugate imaging in this image projecting image set.
7. projection arrangement according to claim 6 is characterized in that: this secondary light source is arranged between this first light source and this image projecting image set.
8. projection arrangement according to claim 6, it is characterized in that: the focal length of this first illuminating lens is f1, the focal length of this second illuminating lens is f2, this light source module produces first virtual light source on the outgoing side of the even device of this light source, this first virtual light source places in the focal distance f 1 of this first illuminating lens, make the virtual image of second virtual light source of its generation and this first virtual light source homonymy, the distance of the virtual image of this second virtual light source and this second illuminating lens is D, wherein this D value is more than a times of this f2, following (f2＜the D＜2f2), so make this virtual light source energy conjugate imaging of twice in image projecting image set.
9. projection arrangement according to claim 1 is characterized in that: this first light source comprises the green-light source of LED, and this secondary light source comprises the ruddiness of LED and the light source of blue light.
10. a projection arrangement supplies the image information is projected on the surface, it is characterized in that this projection arrangement comprises:
The light source module comprises first light source, secondary light source, the first light source modulation mirror, secondary light source modulation mirror, first light source irradiation, the first light source modulation mirror and export the first modulation light source, secondary light source irradiation secondary light source modulation mirror and export the second modulation light source;
The light source compositor supplies this first modulation light source, the second modulation light source are synthesized, and produces the first single light path, and this first light path definition vertically;
The even device of light source for this first light path of input, applies uniformization effect with the light of first light path;
The illuminating lens group, for first light path of input through uniformization effect, first light path is directed to one second light path again, form angle between this first light path and this second light path, this illuminating lens group comprises first illuminating lens, directional introducer and second illuminating lens, directional introducer is directed to second light path in order to first light path just, and the focal length of first illuminating lens is f1, and the focal length of second illuminating lens is f2;
Reflective image generator is for forming this image information;
The prism group after this second light path of input, is projected to reflective image generator with second light path, wherein, reflective image generator forms the 3rd light path with this image information after second light path is reflected, the 3rd light path produces the 4th light path after this prism group reflection;
Image projecting image set, be positioned on the 4th light path, for this image information is projected on this surface, wherein the emitted light path of this secondary light source defines laterally, this is laterally perpendicular to this first light path, and it is horizontal with respect to this, this secondary light source is arranged between this first light source and the image projecting image set, wherein this illuminating lens group illuminating lens group makes the light source energy conjugate imaging that is distributed on the even device of this light source in image projecting image set according to imaging formula, wherein the effective lens distance between first illuminating lens and second illuminating lens is d, this light source module produces first virtual light source on the outgoing side of the even device of this light source, this imaging formula is: this first virtual light source places in the focal distance f 1 of this first illuminating lens, make the virtual image of second virtual light source of its generation and the first virtual light source homonymy, the position that this second virtual light source is set up is the D value apart from this second illuminating lens, wherein this D value is more than a times of this f2, following (f2＜the D＜2f2), so make this second virtual light source energy conjugate imaging of twice in image projecting image set.
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| CN2010101560892A CN101806990B (en) | 2010-03-31 | 2010-03-31 | Projecting device with high light-engine efficiency |
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| CN101806990B CN101806990B (en) | 2012-01-04 |
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| CN102789121A (en) * | 2012-04-10 | 2012-11-21 | 海信集团有限公司 | Projection display light source |
| WO2013063835A1 (en) * | 2011-11-03 | 2013-05-10 | 广景科技有限公司 | Dlp micro projector |
| CN105093802A (en) * | 2014-05-06 | 2015-11-25 | 宁波舜宇光电信息有限公司 | Light-turning three-dimensional imaging apparatus and projection device and method thereof |
| CN114609853A (en) * | 2022-03-22 | 2022-06-10 | 青岛海信激光显示股份有限公司 | Laser light source system and projection equipment |
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| CN1338651A (en) * | 2000-08-10 | 2002-03-06 | Lg电子株式会社 | Prism system for DMD and projector therewith |
| CN1628266A (en) * | 2001-02-26 | 2005-06-15 | 松下电器产业株式会社 | Projection display device |
| CN101364037A (en) * | 2007-08-07 | 2009-02-11 | 立景光电股份有限公司 | Illumination system of led for projection display |
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| CN1338651A (en) * | 2000-08-10 | 2002-03-06 | Lg电子株式会社 | Prism system for DMD and projector therewith |
| CN1628266A (en) * | 2001-02-26 | 2005-06-15 | 松下电器产业株式会社 | Projection display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2013063835A1 (en) * | 2011-11-03 | 2013-05-10 | 广景科技有限公司 | Dlp micro projector |
| CN102789121A (en) * | 2012-04-10 | 2012-11-21 | 海信集团有限公司 | Projection display light source |
| CN104808426A (en) * | 2012-04-10 | 2015-07-29 | 海信集团有限公司 | Projection display light source |
| US10197896B2 (en) | 2012-04-10 | 2019-02-05 | Hisense Co., Ltd. | Laser light source with reduced beam combination operation for projection display |
| CN105093802A (en) * | 2014-05-06 | 2015-11-25 | 宁波舜宇光电信息有限公司 | Light-turning three-dimensional imaging apparatus and projection device and method thereof |
| CN114609853A (en) * | 2022-03-22 | 2022-06-10 | 青岛海信激光显示股份有限公司 | Laser light source system and projection equipment |
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| Publication number | Publication date |
|---|---|
| CN101806990B (en) | 2012-01-04 |
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