CN102566237B - Portable liquid crystal projection light engine employing back reflection prism array - Google Patents
Portable liquid crystal projection light engine employing back reflection prism array Download PDFInfo
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Abstract
The invention relates to a portable liquid crystal projection light engine employing a back reflection prism array. The light engine consists of a light source module, a light management module, an image signal module and a projection lens module, and two polarization states of light with three primary colors can be effectively utilized so as to greatly improve the optical efficiency of the whole machine. Two primary color light sources can be packaged together through the light source module, the volume of the light engine is reduced by 30 percent, the whole machine has a compact and light structure; the traditional plane mirror is replaced by a high-efficiency back reflection micro-prism array in the light management module, incident light rays at all angles can return to the light source along the original paths, are polarized and rotated, and enter a subsequent illumination system, non-normal incident light rays are collected to the greatest degree, and the output brightness of the whole machine is improved on the basis of not increasing the complexity and cost of the system.
Description
Technical field
The present invention relates to a kind of projection display system, particularly relate to the portable liquid crystal projection light engines of the employing retroreflective prism arrays of a kind of energy significant increase brightness.
Background technology
Projection Display has become the main way of large-screen high-resolution Dynamic Announce, is widely used in the important steps such as commercial affairs, education, scientific research, amusement and family.In recent years, along with the fast development of many technology such as microelectronics, optics, processing technology, and the increasing of the universal and hand-held digital product of modern business mobile office pattern, the microminiaturized new direction becoming again projection display technique development.Minitype projection machine has light and handy and easy to use grade for remarkable advantage, and can combine with all kinds of consumption electronic product, this makes the application of micro projection become infinitely wide.
Minitype projection machine has strict requirement to brightness, Ti Ji ﹑ power consumption, cost and heat radiation etc.Realize the micro projection system of high brightness, small size, low-power consumption and low cost, just must do very large improvement in light source ﹑ optical modulation device ﹑ optical system and optical device etc. and even reform.
At present, micro projection is mainly based on DLP(Digital Lighting Processor) and LCoS(Liquid Crystal on Silicon) technology.DLP and LCoS technology is array reflection type projection technology.It is high and without the need to advantages such as polarized lights that DLP technology has reflectivity, but its chip DMD(Digital Mirror Device) processing procedure is extremely complicated, for TI company exclusively controls.LCoS technology has the advantage such as high resolving power and low cost, and color enriches true to nature more, and image is without pixel sense, and picture edge is more natural.In addition technical opening, is applicable to micro projection to the rigors of small size, high resolving power and low cost very much.
The micro projection of main flow all adopts high-brightness LED as lighting source.LED has Ti Ji little ﹑ life-span Chang ﹑ and responds the plurality of advantages such as fast and environmental protection, has become the inevitable choice of micro projection.Adopt three-primary color LED as light source, significantly can promote the colour gamut expressive ability of projector.Although current LED light flux is general not high, and the luminous flux on its unit optical extend will lower than conventional projection light source, believe the development along with the luminescence efficiency of LED own, phosphor technologies and encapsulation technology, LED light source will be more efficient.OSRAM developed electro-optical efficiency up to 61% red-light LED (predominant wavelength is 609nm).At 1mm
2chip, light efficiency can be realized when working current is 40mA up to 201 lm/W, and the specular removal of 168 lm/W still can be provided under the exemplary operation electric current of 350mA.Efficiency is higher, and chip is less, can bring larger space to micro projection design.In addition, up-to-date phosphor technologies is also applied to micro projection light source by OSRAM, makes green light LED luminance raising one times under equal-wattage, reaches the high brightness of 500 lm under 1.4A working current.All these promote, and all imply that LED also has very large potentiality as micro projection light source, this certainly will become one of power of micro projection luminance raising.
Micro display chip and light source as the important component part of micro projection, but need that an efficient polarized light management system---photo engine, passes to optical modulation device by energy of light source.In order to improve complete machine brightness and color saturation, generally adopt now three-primary color LED as lighting source.Traditional micro projection photo engine adopts the method for X-Cube prism (US6018418) and two dichroic prism to realize substantially.The former utilizes X-Cube prism to become common road light beam by photosynthetic for the three primary colours being positioned at its three limits, from its 4th limit outgoing, closes colour efficiency very low, but compact conformation.The latter adopts two two to colour splitting prism, and closing look by twice primary colours becomes common road light beam, close colour efficiency higher, but volume is larger.No matter adopt which kind of structure, all need, through the polarized light needed for polarizer generation liquid crystal display, to this means the light energy losses just having half at the Lights section, the optical efficiency of complete machine is reduced greatly.This micro projection system just very low to intrinsic brightness, real inadvisable.Visible, traditional photo engine has become a bottleneck of micro projection development.Although also there are some technology to improve, such as adopt reflective polarizer, to improve the utilization of another kind of polarized light, promote limited extent, fail to jump out the constraint of traditional light engine arrangement all the time.
The patent (number of patent application is 201110168636.3) of applicant's application provides a kind of reflective micro projection light engine arrangement completely newly.This structure adopts three-primary color LED illumination, utilize the polarization of polarization beam splitter prism (PBS:Polarization Beam Splitter) and Polarization interference filter composition to integrate light path, the three primary colours polishing of different polarization states be combined into same polarized light and shine to image modulation device.Meanwhile, the light recovery structure adopting quarter-wave plate and catoptron to form, the light not being entered subsequent optical path first time is recycled after polarization rotates, and effectively can utilize two kinds of polarization states of three primary colours light, thus significantly promote the optical efficiency of complete machine.In this photo engine, catoptron is an important device, is reflected back by the second polarization state light of first and three primary colours, becomes the first polarization state twice, then enter follow-up illuminator through quarter-wave plate.In like manner, the first polarized light of the second primary colours also reflects back by catoptron, becomes the second polarized light twice after quarter-wave plate.This novel photo engine exists.In light normal incidence situation, the Guang Jiangyuan road irradiated on catoptron returns, and is polarized recycling after rotating, reaches optimum efficiency.But in actual optical system, certainly exist anon-normal incident ray, namely light incides surface optical device at an angle.At present, micro projection system adopts LED as lighting source, and its dispersion angle (2 φ) reaches
, luminous energy is all that non-normal incidence is in optical device greatly.Therefore, the optical system of a large-numerical aperture (little F/#) is needed to collect the high angle scattered light sent from light source as much as possible.Such as, the optical system of F/#2.5 can collect ±
within light, and the optical system of F/#1.8 can collect ±
within light, the latter has higher light energy collection rate relative to the former.Micro projection system adopts the optical system of large-numerical aperture (little F/#) usually, to collect high angle scattered light as much as possible, and the elevator system efficiency of light energy utilization.These high angle scattered light defer to refraction law and reflection law is propagated in each optical device.On the mirror, anon-normal incident angle light will reflect away along minute surface normal symmetry direction, but not former road returns, and this will cause part light to be recovered and to cause light energy losses.Therefore, how having reused large angle incidence light efficiently, is very important to the further lifting of micro projection system brightness.
In addition, this structure adopts three free-standing LED light sources to throw light on, and the volume of total is bigger than normal, constrains the portability of whole system.
Summary of the invention
The present invention seeks to for the deficiencies in the prior art, provide a kind of portable liquid crystal projection light engines adopting retroreflective prism arrays, the present invention has reused the anon-normal incident ray sent from light source, thus the brightness improving complete machine exports.
The object of the invention is to be achieved through the following technical solutions: a kind of portable liquid crystal projection light engines adopting retroreflective prism arrays, it comprises light source module, polarized light administration module, image information module and projection lens; Wherein, described light source module comprises red-light LED, green light LED, blue-ray LED, ruddiness light balancing device, green glow light balancing device and blue light light balancing device, red-light LED is connected with ruddiness light balancing device, and green light LED is connected with green glow light balancing device, and blue-ray LED is connected with blue light light balancing device; Light regime module by polarization close color element, collector lens, Polarization interference filter, the 2nd PBS successively arranged in co-axial alignment form; Image information module is positioned at a right-angle side of the 2nd PBS, projection lens is positioned at the outgoing limit of the 2nd PBS, and described polarization closes color element and forms to colour splitting prism, a PBS, retroreflective microprism array, ruddiness quarter-wave plate, green glow quarter-wave plate and blue light quarter-wave plate by two; Wherein, a PBS is coaxial with collector lens, and two glue together to colour splitting prism and a PBS; In red-light LED, green light LED and blue-ray LED, the light incidence two that any two LED send is to colour splitting prism, the incident PBS of the light that last LED sends, ruddiness quarter-wave plate, green glow quarter-wave plate and blue light quarter-wave plate are glued at two respectively on colour splitting prism and the corresponding plane of incidence of a PBS; Retroreflective microprism array is positioned on a PBS, the exit facet of the S light that last LED sends, and makes the polarized light recycling not entering follow-up system.
A kind of portable liquid crystal projection light engines adopting retroreflective prism arrays, it comprises light source module, polarized light administration module, image information module and projection lens, wherein, light regime module by polarization close color element, collector lens, Polarization interference filter, the 2nd PBS successively arranged in co-axial alignment form, image information module is positioned at a right-angle side of the 2nd PBS, and projection lens is positioned at the outgoing limit of the 2nd PBS; Described light source module comprises red-light LED, green light LED, blue-ray LED, green glow light balancing device and red blue light balancing device, and green light LED is connected with green glow light balancing device, and red-light LED and blue-ray LED are all connected with red blue light balancing device; Described polarization closes color element and is made up of a PBS, catoptron, green glow quarter-wave plate and broadband quarter-wave plate; Wherein, a PBS is coaxial with collector lens, and green glow quarter-wave plate and broadband quarter-wave plate are glued on the corresponding plane of incidence of a PBS respectively; Catoptron is positioned on a PBS, the exit facet of the S light that green light LED sends, and makes the polarized light recycling not entering follow-up system.
A kind of portable liquid crystal projection light engines adopting retroreflective prism arrays, it comprises light source module, polarized light administration module, image information module and projection lens, wherein, described light regime module by polarization close color element, collector lens, Polarization interference filter, the 2nd PBS successively arranged in co-axial alignment form, image information module is positioned at a right-angle side of the 2nd PBS, and projection lens is positioned at the outgoing limit of the 2nd PBS; Described light source module comprises red-light LED, green light LED, blue-ray LED, green glow light balancing device and red blue light balancing device, and green light LED is connected with green glow light balancing device, and red-light LED and blue-ray LED are all connected with red blue light balancing device; Described polarization closes color element and is made up of a PBS, retroreflective microprism array, green glow quarter-wave plate and broadband quarter-wave plate; Wherein, a PBS is coaxial with collector lens, and green glow quarter-wave plate and broadband quarter-wave plate are glued on the corresponding plane of incidence of a PBS respectively; Retroreflective microprism array is positioned on a PBS, the exit facet of the S light that green light LED sends, and makes the polarized light recycling not entering follow-up system.
The invention has the beneficial effects as follows, the present invention adopts retroreflective prism, no matter normal incidence and anon-normal incident angle light, can return and be recycled in former road, and the efficiency of light energy utilization reaches best, thus output brightness is promoted further.In addition, the first primary colours and three primary colours are packaged together by the present invention, by the volume-diminished about 30% of whole system, can more be conducive to the microminiaturization realizing optical projection system.
Accompanying drawing explanation
Fig. 1 is the structural representation of first embodiment of the invention;
Fig. 2 describes the ray trajectory figure of the first primary colours in first embodiment of the present invention;
Fig. 3 describes the ray trajectory figure of three primary colours in first embodiment of the present invention;
Fig. 4 describes the ray trajectory figure of the second primary colours in first embodiment of the present invention;
Fig. 5 is the structural representation of second embodiment of the invention;
Fig. 6 describes the ray trajectory figure of the first primary colours and three primary colours in second embodiment of the invention;
Fig. 7 describes the ray trajectory figure of the second primary colours in second embodiment of the invention;
Fig. 8 is the ray trajectory figure of non-normal incidence light at plane mirror;
Fig. 9 is the ray trajectory figure of non-normal incidence light in retroreflective microprism array surface;
Figure 10 is the first primary colours when adopting plane mirror in prior art and three primary colours ray trajectory figure;
Figure 11 is the first primary colours when adopting retroreflective microprism array in embodiments of the invention one and three primary colours ray trajectory figure;
Figure 12 is the second primary lights line tracking figure when adopting plane mirror in prior art;
Figure 13 is the second primary lights line tracking figure when adopting retroreflective microprism array in embodiments of the invention one;
Figure 14 is the structural representation of third embodiment of the invention;
Figure 15 is the first primary colours when adopting plane mirror in embodiments of the invention two and three primary colours ray trajectory figure;
Figure 16 is the first primary colours when adopting retroreflective microprism array in embodiments of the invention three and three primary colours ray trajectory figure;
Figure 17 is the second primary lights line tracking figure when adopting plane mirror in embodiments of the invention two;
Figure 18 is the second primary lights line tracking figure when adopting retroreflective microprism array in embodiments of the invention three;
In figure: reflection type liquid crystal projection display system 1, light source module 2, polarized light administration module 3, image information module 4, projection lens 5, red-light LED 21, green light LED 22, blue-ray LED 23, ruddiness light balancing device 211, red light beam 212, green glow light balancing device 221, green beam 222, blue light light balancing device 231, light beam 232, red blue light balancing device 234, two to colour splitting prism 31, one PBS 32, catoptron 33, retroreflective microprism array 37, collector lens 34, Polarization interference filter 35, 2nd PBS 36, ruddiness quarter-wave plate 321, green glow quarter-wave plate 322, blue light quarter-wave plate 323, broadband quarter-wave plate 324.
Embodiment
The present invention will be described in detail by embodiment, and those skilled in the art are by other embodiments of the present invention easier to understand.Will recognize that, the present invention can be applicable to other and different embodiments, and can make change to its some details in every way, and all these can not depart from the spirit and scope of the present invention.
Technology contents of the present invention, characteristic and advantage etc., be described in detail with reference to the accompanying drawings.Without departing from the present invention, structure and otherwise change can be made to it, and as other embodiments.The various aspects of each embodiment and each different embodiment thereof can combinationally use in any suitable manner.So accompanying drawing and enumeration are descriptive and nonrestrictive by being counted as in essence.It should be noted that in different diagrams, identity unit adopts identical reference number to represent.
Embodiment 1
Fig. 1 gives the structure of first embodiment of the invention, comprises light source module 2, polarized light administration module 3, image information module 4 and projection lens 5.
Light source module 2 comprises red-light LED 21, green light LED 22, blue-ray LED 23, ruddiness light balancing device 211, green glow light balancing device 221 and blue light light balancing device 231, red-light LED 21 is connected with ruddiness light balancing device 211, green light LED 22 is connected with green glow light balancing device 221, and blue-ray LED 23 is connected with blue light light balancing device 231.
The three primary colours natural light that red-light LED 21, green light LED 22, blue-ray LED 23 are launched collects the rectangular light beam become needed for illumination afterwards respectively through ruddiness light balancing device 211, green glow light balancing device 221 and blue light light balancing device 231: red light beam 212, green beam 222, light beam 232.
Light regime module 3 by polarization close color element, collector lens 34, Polarization interference filter 35, the 2nd PBS 36 successively arranged in co-axial alignment form.In the present embodiment, polarization closes color element and forms to colour splitting prism 31, a PBS 32, retroreflective microprism array 37, ruddiness quarter-wave plate 321, green glow quarter-wave plate 322, blue light quarter-wave plate 323 by two.
Two to colour splitting prism 31, red-light LED 21 and blue-ray LED 23 are sent photosyntheticly become common road light beam, two to the both sides of the corresponding red blue-light source of colour splitting prism 31, gummed has ruddiness quarter-wave plate 321 and blue light quarter-wave plate 323 respectively.One PBS 32 and two is glued together to colour splitting prism 31, and the edge gluing of corresponding green light LED 22 has green glow quarter-wave plate 322.One PBS 32 reflects the first polarized light of each primary colours and its second polarized light of transmission.The design wavelength of ruddiness quarter-wave plate 321, green glow quarter-wave plate 322, blue light quarter-wave plate 323 corresponds respectively to the centre wavelength of respective primary lights, after the linearly polarized light of often kind of primary colours successively passes twice through respective quarter-wave plate, polarization direction 90-degree rotation.Retroreflective prism arrays 37 is positioned at the transmitted light path side of a PBS 32, is returned to improve system light recycling rate of waterused by each primary lights being transmitted to its surface by former road.Collector lens 34 and Polarization interference filter 35 are between the first PBS 32 and the 2nd PBS 36.The polarization that Polarization interference filter 35 can realize selective spectral rotates, and for the polarized light 90-degree rotation expecting wave band, and the polarized light of its all band keeps polarization state constant, thus realizes the integration of different spectrum primary colours polarization polarisation of light.Red light beam 212, green glow 222, blue light 232 represents the direction of transfer after the even light of each primary colours and corresponding polarization state respectively.
Picture signal module 4 is a reflection type liquid crystal projected light modulation device---LCoS chip, be positioned at a right-angle side of the 2nd PBS 36, according to the picture signal that peripheral control circuits (not shown) provides, sequentially by red light beam 212, green beam 222 and light beam 232 are modulated to second polarization state from first polarization state, to form the coloured image comprising often kind of color component.
Projection lens 5 is positioned at the outgoing limit of the 2nd PBS 36, and by the red light beam 212 of carrying corresponding image signals after the 2nd PBS 36, green beam 222 and light beam 232 project on screen.
Fig. 2, Fig. 3 and Fig. 4 sets forth the round of each primary lights in light source 2 and polarization conjunction color element and the change of polarization state thereof in Fig. 1.
Fig. 2 and Fig. 3 sets forth the light path of red light beam 212 and light beam 232.From the light of red-light LED 21 and blue-ray LED 23 outgoing respectively through after ruddiness light balancing device 211 and blue light light balancing device 231, enter two to colour splitting prism 31.Two to colour splitting prism 31 reflect blue light beam 232 through red light beam 212.Through ruddiness and the blue light of reflection enter a PBS 32, be broken down into mutually orthogonal light beam S and P.S light is reflected, and returns along former road through retroreflective prism arrays 37 after P light transmission, again through a PBS 32 and two to colour splitting prism 31.The Red and blue light of P polarization respectively through ruddiness quarter-wave plate 321 and blue light quarter-wave plate 323, back light source module 2.After light source reflection, the Red and blue light of P polarization is again by ruddiness quarter-wave plate 321 and blue light quarter-wave plate 323.After P polarized light passes twice through quarter-wave plate, its polarization state becomes S light from P light.Now, the ruddiness of S polarization is by two to colour splitting prism 31 transmission, and blue light is reflected.After entering into a PBS, the Red and blue light of S polarization will be reflected away by a PBS 32.Therefore, the S polarized red beam of reflection and blue light can regard two parts as, and a part is through the part of a PBS reflection, and another part is original P polarization, through the part that catoptron and quarter-wave plate polarization conversion reuse.
The track route of the green beam 222 that Fig. 4 gives.Green light LED 22 directly reaches a PBS after its light balancing device 221, the direct transmission of green glow of P polarization, and the green glow of S polarization is reflected, rear first time is reflected by green glow quarter-wave plate 322, again by green glow quarter-wave plate 322 after light source reflection by retroreflective prism arrays 37.Now, S polarization will be converted into P polarization, go out from PBS 32 transmission.
Embodiment 2
Fig. 5 gives the structure of second embodiment of the invention.Red-light LED 21 and blue-ray LED 23 are packaged together, and share same light balancing device 234.Each primary colours are after PBS 32 outgoing, and after collector lens 34 and Polarization interference filter 35, different polarization states primary colours are integrated into identical polarization state.2nd PBS 36 reflects each primary lights in picture signal module 4, and the light transmission after modulation the 2nd PBS projects away from projection lens 5.Relative to Fig. 1, the structure of Fig. 5 is compacter, and the volume of whole system can reduce about 30%, and not only green light LED 22 and light balancing device 221 thereof can closer to PBS 32, and lacked dichroic prism 31 and a quarter-wave plate 323, be more conducive to the microminiaturization realizing optical projection system.But this quarter-wave plate 324 must be able to ensure in wider scope, the light of different base colors can fully rotate by polarization.
Fig. 6 and Fig. 7 sets forth the round of each primary colours in light source 2 and polarization conjunction color element and the change of polarization state thereof in Fig. 5.The light of red-light LED 21 and blue-ray LED 23 outgoing, after light balancing device 234, enters a PBS 32, is broken down into mutually orthogonal light beam S and P.S light is reflected, and P light transmission returns along former road through catoptron 33, again through a PBS 32 and broadband quarter-wave plate 324, and back light source module 2.After light source reflection, the Red and blue light of P polarization is again by broadband quarter-wave plate 324.After P polarized light passes twice through quarter-wave plate, its polarization state rotates 90 becomes S light.After entering into a PBS, the Red and blue light of S polarization will be reflected away by a PBS 32, become ruddiness 212 and blue light 232.In like manner, green light LED 22 in Fig. 7 directly reaches a PBS after its light balancing device 221, the direct transmission of green glow of P polarization, and the green glow of S polarization is reflected, rear first time is reflected by green glow quarter-wave plate 322, again by green glow quarter-wave plate 322 after light source reflection by catoptron 33.Now, S polarization will be converted into P polarization, go out, become light 222 from PBS 32 transmission.
Therefore, each primary colours can regard two parts as from the light of PBS 32 outgoing: a part is the polarized light of directly reflection or transmission, and another part is through the polarized light that catoptron and quarter-wave plate are recycled.In polarization recycling structure, catoptron plays very crucial effect.But the photo engine of Fig. 5 is the principle design that light can be reflected back according to former road based on catoptron.This light normal incidence in mirror surface time be set up.But under anon-normal condition of incidence, light is reflected according to minute surface normal symmetric angle direction but not former road returns.Therefore, the microprism array substitutive patterns catoptron with retro-reflective properties must be adopted, to maximize the collection of anon-normal incident ray.
Fig. 8 gives the ray trajectory of mirror-reflection.When light is incident according to certain angle, reflection ray reflects away along minute surface normal symmetric angle direction.
Fig. 9 gives the ray trajectory of any incident light in retroreflective microprism array surface.All angle light is all reflected back according to incident direction.
Figure 10 gives red LED 21 and blue led 23 normal incidence light and anon-normal when adopting level crossing and is incident on polarization and closes run trace in color element.When normal incidence, former for light road can return by mirror-reflection, thus realizes the recycling of light.But under anon-normal condition of incidence, light is after minute surface 33 reflects, and part high angle scattered light is reflected light source recovery section and causes light energy losses.
Figure 11 gives red LED 21 and blue led 23 normal incidence light and anon-normal incident ray when adopting retroreflective prism arrays and closes the run trace in color element at polarization.Adopt retroreflective prism 37, no matter normal incidence and anon-normal incident ray, can return and be recycled in former road.The efficiency of light energy utilization reaches best, thus output brightness is promoted further.
Figure 12 gives green LED 22 normal incidence light and anon-normal when adopting level crossing and is incident on polarization and closes run trace in color element.In like manner, normal incidence light is after minute surface 33 reflects, and Ke Yuanlu returns, but not normal incidence light then has part be reflected light source and cause light energy losses.
Figure 13 gives green LED normal incidence light and anon-normal incident ray when adopting retroreflective prism arrays and closes the run trace in color element at polarization.In like manner, normal incidence light and anon-normal incident ray, after retroreflective prism 37, can return and be recycled in former road.
Embodiment 3
Figure 14 gives the structure of third embodiment of the invention, comprise light source module 2, polarized light administration module 3, image information module 4 and projection lens 5 etc., wherein, light regime module 3 by polarization close color element, collector lens 34, Polarization interference filter 35, the 2nd PBS 36 successively arranged in co-axial alignment form, image information module 4 is positioned at a right-angle side of the 2nd PBS 36, and projection lens 5 is positioned at the outgoing limit of the 2nd PBS 36; Described light source module 2 comprises red-light LED 21, green light LED 22, blue-ray LED 23, green glow light balancing device 221 and red blue light balancing device 234, green light LED 22 is connected with green glow light balancing device 221, and red-light LED 21 and blue-ray LED 23 are all connected with red blue light balancing device 234; Described polarization closes color element and is made up of a PBS 32, retroreflective microprism array 37, green glow quarter-wave plate 322, broadband quarter-wave plate 324 etc.; Wherein, a PBS 32 is coaxial with collector lens 34, and green glow quarter-wave plate 322 and broadband quarter-wave plate 324 are glued on the corresponding plane of incidence of a PBS 32 respectively; Retroreflective microprism array 37 is positioned on a PBS 32, the exit facet of the S light that green light LED 22 sends, and makes the polarized light recycling not entering follow-up system.This embodiment combines the advantage of embodiment 1 and embodiment 2.
Figure 15 gives red-light LED 21 and blue-ray LED 23 normal incidence light and anon-normal incident ray when adopting level crossing and closes the run trace in color element at Fig. 6 polarization.Normal incidence light, after mirror-reflection, former for light road can be returned, but not normal incidence light is after level crossing 33, is then had part high angle scattered light be reflected light source recovery section and cause light energy losses.
Figure 16 gives red LED 21 and blue led 23 normal incidence light when adopting retroreflective prism arrays and non-ly to close run trace in color element at polarization as penetrating light.Adopt retroreflective prism 37, no matter normal incidence and anon-normal incident ray, can return and be recycled in former road.The efficiency of light energy utilization reaches best, thus output brightness is promoted further.
Figure 17 gives green light LED 22 normal incidence light and anon-normal incident ray when adopting level crossing and closes the run trace in color element at Fig. 7 polarization.Normal incidence light, after mirror-reflection, former for light road can be returned, and anon-normal light inlet line is after minute surface 33, then have part high angle scattered light be reflected light source recovery section and cause light energy losses.
Figure 18 gives green LED normal incidence light when adopting retroreflective prism arrays and non-ly to close run trace in color element at polarization as penetrating light.Adopt retroreflective prism 37, no matter normal incidence and anon-normal incident ray, can return and be recycled in former road.The efficiency of light energy utilization reaches best, thus output brightness is promoted further.
Although describe various characteristic of the present invention and advantage with reference to described embodiment, it will be understood to those of skill in the art that can to the shape of its parts, and size and layout etc. make change, and can not depart from the spirit and scope of the present invention.In example, although shown concrete component type, other also can be used similar to suitable substitute.Therefore, above description is intended to provide example embodiment of the present invention, and the scope of the invention is not by the restriction of this concrete example provided.
Claims (3)
1. adopt a portable liquid crystal projection light engines for retroreflective prism arrays, it comprises light source module (2), polarized light administration module (3), image information module (4) and projection lens (5); Wherein, described light source module (2) comprises red-light LED (21), green light LED (22), blue-ray LED (23), ruddiness light balancing device (211), green glow light balancing device (221) and blue light light balancing device (231), red-light LED (21) is connected with ruddiness light balancing device (211), green light LED (22) is connected with green glow light balancing device (221), and blue-ray LED (23) is connected with blue light light balancing device (231); Light regime module (3) by polarization close color element, collector lens (34), Polarization interference filter (35), the 2nd PBS (36) successively arranged in co-axial alignment form; Image information module (4) is positioned at the 2nd PBS(36) a right-angle side, projection lens (5) is positioned at the 2nd PBS(36) outgoing limit, it is characterized in that, described polarization closes color element by two to colour splitting prism (31), a PBS(32), retroreflective microprism array (37), ruddiness quarter-wave plate (321), green glow quarter-wave plate (322), blue light quarter-wave plate (323) form; Wherein, a PBS(32) coaxial with collector lens (34), two to colour splitting prism (31) and a PBS(32) gummed; In red-light LED (21), green light LED (22) and blue-ray LED (23), the light incidence two that any two LED send is to colour splitting prism (31), the incident PBS(32 of light that last LED sends), ruddiness quarter-wave plate (321), green glow quarter-wave plate (322) and blue light quarter-wave plate (323) are glued at two respectively to colour splitting prism (31) and a PBS(32) accordingly on the plane of incidence; Retroreflective microprism array (37) is positioned at a PBS(32) on, the exit facet of the S light that last LED sends, makes the polarized light recycling not entering follow-up system.
2. one kind adopts the portable liquid crystal projection light engines of retroreflective prism arrays, it comprises light source module (2), polarized light administration module (3), image information module (4) and projection lens (5), wherein, light regime module (3) by polarization close color element, collector lens (34), Polarization interference filter (35), the 2nd PBS (36) successively arranged in co-axial alignment form, image information module (4) is positioned at the 2nd PBS(36) a right-angle side, projection lens (5) is positioned at the 2nd PBS(36) outgoing limit; It is characterized in that, described light source module (2) comprises red-light LED (21), green light LED (22), blue-ray LED (23), green glow light balancing device (221) and red blue light balancing device (234), green light LED (22) is connected with green glow light balancing device (221), and red-light LED (21) and blue-ray LED (23) are all connected with red blue light balancing device (234); Described polarization closes color element by a PBS(32), catoptron (33), green glow quarter-wave plate (322), broadband quarter-wave plate (324) form; Wherein a, PBS(32) coaxial with collector lens (34), green glow quarter-wave plate (322) and broadband quarter-wave plate (324) are glued at a PBS(32 respectively) on the corresponding plane of incidence; Catoptron (33) is positioned at a PBS(32) on, the exit facet of the S light that green light LED (22) sends, makes the polarized light recycling not entering follow-up system.
3. one kind adopts the portable liquid crystal projection light engines of retroreflective prism arrays, it comprises light source module (2), polarized light administration module (3), image information module (4) and projection lens (5), wherein, light regime module (3) by polarization close color element, collector lens (34), Polarization interference filter (35), the 2nd PBS (36) successively arranged in co-axial alignment form, image information module (4) is positioned at the 2nd PBS(36) a right-angle side, projection lens (5) is positioned at the 2nd PBS(36) outgoing limit; It is characterized in that, described light source module (2) comprises red-light LED (21), green light LED (22), blue-ray LED (23), green glow light balancing device (221) and red blue light balancing device (234), green light LED (22) is connected with green glow light balancing device (221), and red-light LED (21) and blue-ray LED (23) are all connected with red blue light balancing device (234); Described polarization closes color element by a PBS(32), retroreflective microprism array (37), green glow quarter-wave plate (322), broadband quarter-wave plate (324) form; Wherein a, PBS(32) coaxial with collector lens (34), green glow quarter-wave plate (322) and broadband quarter-wave plate (324) are glued at a PBS(32 respectively) on the corresponding plane of incidence; Retroreflective microprism array (37) is positioned at a PBS(32) on, the exit facet of the S light that green light LED (22) sends, makes the polarized light recycling not entering follow-up system.
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| CN201210084870.2A CN102566237B (en) | 2012-03-28 | 2012-03-28 | Portable liquid crystal projection light engine employing back reflection prism array |
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| CN103576432A (en) * | 2012-08-07 | 2014-02-12 | 青岛海泰新光科技有限公司 | LED light source lighting device for micro projection display |
| CN105573033B (en) * | 2015-12-21 | 2017-06-23 | 中国科学院长春光学精密机械与物理研究所 | Projection optical system |
| EP3583451A4 (en) * | 2017-02-20 | 2020-12-23 | 3M Innovative Properties Company | Retroreflecting article including retarder |
| CN110618537B (en) * | 2019-09-02 | 2021-10-01 | 深圳技术大学 | Coated lens device and three-dimensional reconstruction imaging system applying same |
| CN114460798A (en) * | 2020-11-09 | 2022-05-10 | 深圳光峰科技股份有限公司 | Light engine system and projection equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0573905A1 (en) * | 1992-06-08 | 1993-12-15 | Minnesota Mining And Manufacturing Company | Retroreflecting polarizer for presentation systems |
| CN1637585A (en) * | 2003-12-19 | 2005-07-13 | 卡尔蔡斯耶拿有限公司 | Array for the illumination of an object |
| CN102231042A (en) * | 2011-06-22 | 2011-11-02 | 贺银波 | Light engine system for reflective liquid crystal projection display |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0573905A1 (en) * | 1992-06-08 | 1993-12-15 | Minnesota Mining And Manufacturing Company | Retroreflecting polarizer for presentation systems |
| CN1637585A (en) * | 2003-12-19 | 2005-07-13 | 卡尔蔡斯耶拿有限公司 | Array for the illumination of an object |
| CN102231042A (en) * | 2011-06-22 | 2011-11-02 | 贺银波 | Light engine system for reflective liquid crystal projection display |
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