CN103852897A - Micro optical engine system based on reuse of polarized light - Google Patents
Micro optical engine system based on reuse of polarized light Download PDFInfo
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- CN103852897A CN103852897A CN201410104633.7A CN201410104633A CN103852897A CN 103852897 A CN103852897 A CN 103852897A CN 201410104633 A CN201410104633 A CN 201410104633A CN 103852897 A CN103852897 A CN 103852897A
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Abstract
The invention belongs to the technical field of projection display and specifically discloses a micro optical engine system based on reuse of polarized light. The micro optical engine system based on reuse of polarized light is characterized in that light beams, which are sent by a lighting source, are homogenized and pre-collimated by conical light homogenizing bars and then re-collimated by a collimating lens group; after the homogenized and collimated light beams pass through a polarized light converter, the light beams are converted from non-polarized light to polarized light; the light beams are collected by a subsequent relay lens group and a PBS (Phosphate Buffer Saline) prism and then transmitted to a surface of a micro display chip to form even collimated lighting; images on the micro display chip are amplified and imaged on a screen through a projection objective lens. The light beams, which are sent by the lighting source, are converted to polarized light in the same polarized state before entering the PBS prism, so that the polarized light in the other polarized state can be reused, thereby avoiding the condition that about half of the light in the other polarized state after the light beams in the traditional liquid crystal type micro optical engine enter the PBS prism is wasted.
Description
Technical field
The invention belongs to projection display technique field, be specially a kind of based on the multiplexing micro-optical automotive engine system of polarized light.
Background technology
It is early stage that shadow casting technique rose in for 19th century, is to promote and come on the invention of 19 20 beginning of the century of end of the century films and popular basis.At present, the appearance of the projection display technique of micro display chip, makes miniaturization and high-resolution Projection Display become possibility.Projection display technique based on micro display chip is to be projected on screen after image that Diagonal Dimension is produced for the micro display chip of 0.20-0.60 inch amplifies.It combines optics and ripe semiconductor technology, is the approach that realizes the demonstration of large scale high resolving power that a kind of cost performance is high.
For current micro projection photo engine, keep lower cost, the micro projection photo engine of liquid crystalline type (LCoS and LCD) is good selection, but in this type light engine, have the polarized light of half left and right to be utilized, the brightness of photo engine is the biggest obstacle of its range of application of restriction.Therefore the optical efficiency problem that, how to solve liquid crystalline type micro projection photo engine just seems most important.
At present, the method that improves micro projection light engine efficiency is application compound eye PCS(polarization conversion system), Polarization interference filter and macromolecule polarized light conversion film etc.Concrete patent: patent 1:CN 101782688 A; Patent 2:CN 102141723 A; Patent 3:CN 103293843 A; Patent 4:CN 102998884 A; Patent 5:CN 202583680 U; Patent 6:CN 102314066 A.But often there is the not high enough problem of optical efficiency in the Miniature optical engine of the methods such as application Polarization interference filter and macromolecule polarized light conversion film, and in illuminator, apply the Miniature optical engine of compound eye polarization conversion system method, when system architecture complexity, increase processing and manufacturing difficulty.Especially compound eye and polarization conversion system; their unit size can be reduced to below 1mm along with reducing of micro display chip size; this has just increased considerably processing and manufacture difficulty and the cost of optical element, and the utmost point is unfavorable for Miniaturization Design, batch and the large-scale production of micro-optical engine.
In view of the foregoing defects the prior art has; the object of the invention is to propose a kind of high brightness, high evenness, high-contrast, high definition, illumination path is simple in structure; manufacturing cost is lower, can be applicable to large-scale production based on the multiplexing micro-optical automotive engine system of polarized light.
Summary of the invention
For problems of the prior art, the object of the present invention is to provide a kind of technical scheme based on the multiplexing micro-optical automotive engine system of polarized light.
Described based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that: set gradually lighting source along light transmition direction, taper optical wand, collimation lens set, Polarization converter, relay lens group, PBS prism, micro display chip, and projection objective, the light beam that lighting source sends is collimated lens combination and collimates after the even light of taper optical wand and pre-collimation, light beam after even optical alignment converts a kind of polarized light of polarization state to after Polarization converter from nonpolarized light, be collected and be passed to micro display chip surface and form uniform collimated illumination through follow-up relay lens group and PBS prism, image on micro display chip passes through projection objective amplification imaging again on screen.
Described based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that described taper optical wand is taper, its cross section is rectangle or pentagon, and taper optical wand exit end face area is more than or equal to incident end face area, taper optical wand is solid or hollow, solid cone shaped optical wand material is glass or plastics, conical hollow optical wand inside surface plated film is realized the total reflection in optical wand, and rete adopts the method for electron beam evaporation to be coated with and to utilize light-operatedly to shake with quartz crystal that the method combining is carried out thicknesses of layers control or employing electro-plating method is coated with; Described lighting source is close to or is separated with the incident end end face of taper optical wand, or lighting source is imbedded certain depth in taper optical wand incident end end face.
Described based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that described taper optical wand exit end end face separates certain distance with the first lens of collimation lens set, the first lens of collimation lens set are planes near the optical surface of taper optical wand; Or the exit end end face of taper optical wand and the first lens glue of collimation lens set are combined, and the gummed optical surface of the first lens of collimation lens set is plane; Or the first lens of taper optical wand and collimation lens set all adopt optical plastic material, the two is combined into a part injection moulding and makes.
Described based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that the light beam that described lighting source sends directly enters taper optical wand, can in 4mm, form uniform light-emitting area by the exit end end face at taper optical wand, this light-emitting area successively through collimation lens set and relay lens group amplification imaging on micro display chip, enlargement ratio is relay lens group and the ratio square of the focal length of collimation lens set.
Described based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that Polarization converter is made up of one PBS prism, a slice catoptron and a slice half-wave plate; The optical axis of described relay lens group overlaps with the central shaft of Polarization converter.
Described based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that described half-wave plate is arranged on time PBS prism right side, unpolarized collimated light beam incides on the inferior PBS prism of Polarization converter, be divided into two bundle polarized lights, be P polarization state light and S polarization state light, wherein S polarization state light is reflected the rear outgoing of mirror reflection, remain S polarization state light, P polarization state light is directly converted into S polarization state light through half-wave plate, and the polarization state of unpolarized incident beam after Polarization converter is converted into same S polarization state.
Described based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that described half-wave plate is arranged on catoptron right side, unpolarized collimated light beam incides on the inferior PBS prism of Polarization converter, be divided into two bundle polarized lights, be P polarization state light and S polarization state light, wherein S polarization state light passes half-wave plate outgoing after being reflected mirror reflection, be converted to P polarization state light, the direct outgoing of P polarization state light unconverted, the polarization state of unpolarized incident beam after Polarization converter is converted into same P polarization state.
Described based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that described catoptron can replace with right-angle prism, PBS prism or linear polarization grating, described inferior PBS prism can replace with linear polarization grating; When described catoptron replaces with prism, the inclined-plane of prism is coated with reflectance coating to strengthen reflection potential, rete adopts the method for electron beam evaporation to be coated with or is coated with electro-plating method, utilizes light-operatedly to shake with quartz crystal the method combining and carry out thicknesses of layers control while adopting the method for electron beam evaporation to be coated with.
Described based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that the spacing of the 5mm that keeps certain between last a slice lens of described relay lens group and PBS prism; Or last a slice lens of relay lens group are together with PBS prism cementing, and the optical surface of the nearly PBS prism of last a slice lens of relay lens group is plane; Or last a slice lens of relay lens group and PBS prism adopt same material to make parts; Polarizer or the optical filter of polaroid or quarter wave plate and reflecting polarizer composition can be set between relay lens group and PBS prism, to adjust contrast and the color indication range of micro projection optical engine.
Described based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that described micro display chip is color-type or achromaticity type; Micro display chip is color-type, be in the display unit on micro display chip, to have comprised the multiple pixel of red, green, blue, in the time that color-type micro display chip is thrown light on by white light beam, by the color of each display unit of circuit control micro display chip, the coloured image on micro display chip can go out coloured image at screen upslide through projection objective; Micro display chip is achromaticity type, switches and the sequential chart picture of micro display chip shows by collaborative column of colour sequential, and the different colours image on micro display chip, after projection objective, can not project into different colours image on screen in the same time.
The light beam that lighting source of the present invention sends is entering the polarized light that has just been converted to same polarization state before PBS prism, thereby the polarized light of another polarization state is also used again, avoided the light beam in the Miniature optical engine lighting system of traditional liquid crystalline type to enter the situation that has the light of another polarization state of nearly half to be wasted after PBS prism.Simultaneously, in the situation that substantially not increasing illuminator thickness and cost, improve widely the efficiency of illumination light, can obtain the more Uniform Illumination hot spot of high brightness, can effectively solve that traditional polarized light multiplexing method is applied to that the difficulty of processing existing in micro projection photo engine is large, system cost is high and the problem such as optical efficiency is not high.Compared to the photo engine of traditional application compound eye polarization conversion system method, no matter be in system cost, or processing technology aspect all has clear superiority.Should be based on the multiplexing micro-optical automotive engine system of polarized light, have that volume is little, a feature of high brightness, high evenness, high-contrast, high definition, illumination path is simple simultaneously, and cost of manufacture is low, and size is little, easy to assembly, is convenient to large-scale production.
Brief description of the drawings
Fig. 1 is the illuminator optical schematic diagram multiplexing based on polarized light;
Fig. 2 is the structural representation that lighting source and taper optical wand are affixed;
Fig. 3 is the structural representation that lighting source and taper optical wand are separated;
Fig. 4 is the structural representation that lighting source is imbedded taper optical wand;
The structural representation being separated by a distance between Fig. 5 taper optical wand and collimation lens set;
Fig. 6 is the structural representation that the outgoing end face of taper optical wand and the first lens glue of collimation lens set are combined;
Fig. 7 is Polarization converter structural representation one;
Fig. 8 is Polarization converter structural representation two;
Fig. 9 is Polarization converter structural representation three;
Figure 10 is Polarization converter structural representation four;
Figure 11 adopts a kind of based on the multiplexing reflective LCoS/LCD micro-optical automotive engine system of S polarization state polarized light that single white light source throws light on;
Figure 12 adopts a kind of based on the multiplexing reflective LCoS/LCD micro-optical automotive engine system of P polarization state polarized light that single white light source throws light on;
Figure 13 adopts a kind of based on the multiplexing transmission type LCD micro-optical automotive engine system of S polarization state polarized light that single white light source throws light on;
Figure 14 adopts a kind of based on the multiplexing reflective LCoS/LCD micro-optical automotive engine system of P polarization state polarized light that red, green, blue three monochromatic sources throw light on;
Figure 15 adopts a kind of based on the multiplexing reflective LCoS/LCD micro-optical automotive engine system of P polarization state polarized light that red, green, blue three monochromatic sources throw light on;
In figure: 1-lighting source, 2-taper optical wand, 3-collimation lens set, 4-Polarization converter, 5-relay lens group, 6-PBS prism, 7-micro display chip, 8-projection objective, 9-X-Cube color-combination prism, 411-PBS prism, 412-linear polarization grating, 421-catoptron, 422-right-angle prism, 43-half-wave plate, 91-first closes color chips, and 92-second closes color chips.
Embodiment
Below in conjunction with Figure of description, the invention will be further described:
Compared with traditional projection light engines, micro projection photo engine, in considering optical efficiency problem, also needs to keep compact size and lower cost.For problems of the prior art, the present invention proposes a kind of high brightness, high-contrast, high definition, illumination path is simple in structure, manufacturing cost is lower, can be applicable to large-scale production based on the multiplexing micro-optical automotive engine system of polarized light.
The light beam that lighting source 1 sends is after the even light and pre-collimation of taper optical wand 2, being collimated lens combination 3 further collimates, outgoing beam after even optical alignment converts the polarized light of a polarization state to after Polarization converter 4 from nonpolarized light, the surface that is collected and is passed to micro display chip 7 through follow-up relay lens group 5 and PBS prism 6, forms uniform collimated illumination; Image on micro display chip 7 passes through projection objective 8 projection imagings again on screen.
Taper optical wand 2 can be solid, can be also hollow, and solid cone shaped optical wand material is glass or plastics; Conical hollow optical wand inside surface can be realized the total reflection in optical wand by plated film, and rete can adopt the method for electron beam evaporation to be coated with and to utilize light-operatedly to shake with quartz crystal the method combining and carry out thicknesses of layers control, also can be coated with electro-plating method.The light beam direct-coupling that lighting source sends enters in taper optical wand, and coupling efficiency can reach more than 90%.Light beam can form uniform illumination hot spot at outgoing end face after the even light of multiple reflections in the taper optical wand of shorter length, eliminated light source self may with defect, also completed the pre-collimation to incident light simultaneously.
Between the exit end end face of taper optical wand 2 and the first lens of collimation lens set, can there is certain spacing, as 3mm, also can be glued together, an even synthetic part is produced by the way of injection moulding, reduces the trouble that gummed brings.In the time that taper optical wand 2 is combined with the first lens glue of collimation lens set 3, the first lens of collimation lens set can be that plane can be also the optical surface of other form near the optical surface of taper optical wand; In the time that the first lens glue of taper optical wand and collimation lens set is combined, the first lens of collimation lens set are plane near the optical surface of taper optical wand.
The uniformly light-emitting face that taper optical wand 2 exit ends form, the amplification system amplification imaging forming through collimation lens set 3 and relay lens group 5 is on micro display chip 7, enlargement ratio is relay lens group 5 and the ratio of the focal length of collimation lens set 3, in realizing taper optical wand outgoing end surface shape and micro display chip field of illumination form fit, the needs that field of illumination illumination beam collimates are also realized.In this amplification system, Polarization converter and PBS prism do not affect the enlargement ratio of amplification system, only play respectively the effect of polarization conversion and polarization beam splitting, but the aberration that they are introduced needs the amplification system of collimation lens set and relay lens group composition to proofread and correct.
Polarization converter 4 can be made up of one PBS prism 411, a slice catoptron 421 and a slice half-wave plate 43, when half-wave plate is placed near time PBS prism, unpolarized collimated light beam incides on the inferior PBS prism of Polarization converter, be divided into two bundle polarized lights, be P polarization state light and S polarization state light, wherein S polarization state light is reflected the rear outgoing of mirror reflection, remains S polarization state light; P polarization state light is converted into S polarization state light through half-wave plate.Be that the polarization state of incident beam after Polarization converter is converted into S polarization state, can be all utilized by subsequent optical system, thereby reach the multiplexing object of polarized light; When half-wave plate is placed near catoptron, unpolarized collimated light beam incides on the inferior PBS prism of Polarization converter, is divided into two bundle polarized lights, i.e. P polarization state light and S polarization state light, wherein S polarization state light is reflected after mirror reflection through half-wave plate outgoing, is converted to P polarization state light; P polarization state light is through the direct outgoing of unconverted.Be that the polarization state of unpolarized collimated light beam after Polarization converter all converted to P polarization state.
In Polarization converter 4, catoptron can be equal to replacement with prism or PBS prism.Use when prism, the inclined-plane of prism can be coated with reflectance coating to strengthen reflection potential, and rete can adopt the method for electron beam evaporation to be coated with, and utilizes light-operatedly to shake with quartz crystal the method combining and carry out thicknesses of layers control, also can be coated with electro-plating method; The inclined-plane of prism also can glue together with plane mirror, strengthens to realize reflectivity.
In Polarization converter 4, inferior PBS prism and catoptron also can be equal to replacement with linear polarization grating.
Owing to doubling on the Width of photo engine through the collimated light beam bore of Polarization converter, the optical axis of relay lens group need to translation on the Width of photo engine, overlaps keeping with the central shaft of Polarization converter.On the thickness direction of photo engine, the bore of collimated light beam is not having significant change through before and after Polarization converter, thereby does not affect the system thickness of whole Miniature optical engine.
Between last a slice lens of relay lens group 5 and PBS prism 6, keep certain spacing (as 5mm), also can with PBS prism cementing.In the time keeping certain spacing between last a slice lens of relay lens group and PBS prism, last a slice lens of relay lens group are plane or other optical surface near the optical surface of PBS prism.Last a slice lens of relay lens group also can be together with PBS prism cementing, and now last a slice lens of relay lens group are plane near the optical surface of PBS prism.In the time that last a slice lens of relay lens group are the same with the prism material of PBS prism, can synthesize an optical element.
Between relay lens group 5 and PBS prism 6, add polarizer or the optical filter of polaroid or quarter wave plate and reflective polarizer composition, or add quarter wave plate between PBS prism and micro display chip, or between micro display chip and projection objective, add absorption polaroid, to improve contrast and the color indication range of micro projection optical engine.
Micro display chip can be non-color-type.Switch and the sequential chart picture of micro display chip shows by collaborative column of colour sequential, the different colours image on micro display chip, after projection objective, can not project into different colours image on screen in the same time.Utilize the visual persistence phenomenon of human eye, can form the visual effect of coloured image.Column of colour can carry out light splitting acquisition to white light by colour wheel, also can close light to color light source by combined optical module and obtain.
Compared with the light engine of existing application polarized light multiplex technique, disclosed by the inventionly do not use PCS(polarization conversion system based on the multiplexing Miniature optical automotive engine system of polarized light), taper optical wand, inferior PBS prism, catoptron and four elements of half-wave plate are only increased, do not have difficulty and the high problem of cost of processing and fabricating, and the thickness of photo engine does not increase.Whole micro-optical automotive engine system is simple in structure, compact size compactness, and low cost of manufacture has advantages of high optical efficiency, high uniformity and high-contrast simultaneously, radiationless, environmental protection, is suitable for large-scale production.
Figure 1 shows that the illuminator light path principle figure multiplexing based on polarized light.The non-polarized light beam that lighting source 1 sends is successively after the even light of taper optical wand 2 and the further collimation of pre-collimation, collimation lens set 3, convert the polarized light of same polarization state through Polarization converter 4 to, be finally passed and be collected on micro display chip 7 by relay lens group 5.The effect of taper optical wand 2, except light source is collimated in advance, also forms uniform illumination profile on its outgoing end face, reduces the impact that light source self unevenness defect is brought; Collimation lens set 3 forms an amplification system with relay lens group 5, the illumination of the outgoing end face of taper optical wand 2 is amplified and is passed to miniature display chip 7 surfaces, thereby on micro display chip 7, form uniform collimated illumination.The enlargement ratio of amplification system is relay lens group and the ratio of the focal length of collimation lens set, the illuminating bundle N.A.(numerical aperture simultaneously obtaining on micro display chip) value reduces corresponding multiple from the N.A. of optical wand exit end light beam.
Fig. 2,3,4 is depicted as three kinds of position relationship schematic diagram of lighting source 1 and taper optical wand 2.Shown in Fig. 2, lighting source 1 is affixed with taper optical wand 2; Shown in Fig. 3, lighting source 1 is separated by a distance with the incident end section of taper optical wand 2.Shown in Fig. 4, lighting source 1 is imbedded the interior certain distance of taper optical wand 2.
Fig. 5,6 is depicted as two kinds of position relationship schematic diagram of described taper optical wand 2 and collimation lens set 3.Shown in Fig. 5, between taper optical wand 2 and collimation lens set 3, separate a determining deviation, as 3mm.Figure 6 shows that: the outgoing end face of taper optical wand 2 and the first lens glue of collimation lens set 3 are combined, now the first lens of collimation lens set 3 gummed optical surface is plane.In the time that taper optical wand 2 and collimation lens set 3 materials are all optical plastic, situation shown in Fig. 6 can be combined into an optical element and produce by injection moulding way.
Shown in Fig. 7,8,9,10, be respectively the Polarization converter concrete structure schematic diagram described in four kinds, generally be positioned near the position of back focal plane of collimation lens set, but specifically can optimize according to system actual conditions, its size is by from the outgoing beam of collimation lens set 3, the illumination bore on Polarization converter decides.
Wherein, the polarized light shown in Fig. 7 turns device 4, comprises PBS prism 411, a slice catoptron 421 and a slice half-wave plate 43 one time.Unpolarized collimated light beam is incident to time PBS prism 411, and the light beam of its P polarization state sees through the emergent light that is converted to S polarization state after time PBS prism 411 through half-wave plate 43; And the light beam of its S polarization state reflects and outgoing through catoptron 421 after inferior PBS prism 411 reflections again, still keep S polarization state constant; Whole bundle illuminating bundle has all converted the collimated light of S polarization state to after conversion.
Figure 8 shows that and use right-angle prism 422 to replace the catoptron 421 in Fig. 7, be convenient to fixed installation.But use the benefit of catoptron to be lower cost, be convenient to the production of scale in enormous quantities.The inclined-plane plating reflectance coating of right-angle prism, rete can adopt the method for electron beam evaporation to be coated with, and utilize light-operatedly to shake with quartz crystal the method combining and carry out thicknesses of layers control, or employing electro-plating method is coated with; The inclined-plane of prism also can glue together with plane mirror, strengthens to realize reflectivity.
Figure 9 shows that and utilize linear polarization grating 412 to replace the inferior PBS prism 411 in Fig. 7, reach the same multiplexing effect of polarized light.
Figure 10 shows that the half-wave plate in Fig. 7 43 is placed near catoptron 421.Unpolarized collimated light beam incides on the inferior PBS prism 411 of Polarization converter 4, is divided into P polarization state light and S polarization state two is restrainted light, and wherein S polarization state light is reflected after mirror 421 reflections through half-wave plate 43 outgoing, is converted to P polarization state light; P polarization state light is through the direct outgoing of unconverted.Be that the polarization state of incident beam after Polarization converter 4 is converted into P polarization state.
In addition, for the Polarization converter of four kinds of versions shown in Fig. 7,8,9,10, catoptron 421 all available line polarization grating 412 or inferior PBS prism 411 is equal to replacement; Half-wave plate can be selected to place or place near catoptron 421 near time PBS prism 411 according to actual system design.
Figure 11 shows that utilize single white light source to throw light on a kind of based on the multiplexing reflective LCoS/ LCD micro-optical automotive engine system of S polarization state polarized light, be provided with successively along light transmition direction: lighting source 1, taper optical wand 2, collimation lens set 3, Polarization converter 4, relay lens group 5, PBS prism 6, micro display chip 7 and projection objective 8.Lighting source 1 can adopt LED, UHP lamp, Halogen lamp LED, LASER Light Source and other light source.Taper optical wand 2 is chosen to suitable cone angle and length, make light that lighting source 1 sends in taper optical wand 2 shorter distance (as 4mm) through multiple reflections, exit end at taper optical wand 2 obtains Uniform Illumination hot spot, makes the bore of the light beam on collimation lens set 3 back focal planes and angular setting arrive our required scope; Polarization converter 4 is set near the back focal plane of collimation lens set 3, makes the light sending from lighting source 1 all be converted to the polarized light of S polarization state, reach the multiplexing object of polarized light.The light beam that lighting source 1 sends forms uniform illumination profile on the outgoing end face of taper optical wand 2, the amplification system consisting of collimation lens set 3 and relay lens group 5 on LCoS micro display chip 7, forms the Uniform Illumination hot spot matching with LCoS micro display chip 7 with certain proportion amplification imaging.This hot spot illuminates the image of micro display chip, then by PBS prism 6, projection objective 8 by this image projection to screen.
Figure 12 shows that utilize single white light source to throw light on a kind of based on the multiplexing reflective LCoS/LCD micro-optical automotive engine system of P polarization state polarized light, System Working Principle and Figure 11 are similar, difference only adopts the illumination of P polarization state in the LCoS of Figure 12 micro display chip 7, and Polarization converter 4 is exported P polarized light.
Figure 13 shows that utilize single white light source to throw light on a kind of based on the multiplexing transmission type LCD micro-optical automotive engine system of S polarization state polarized light, be provided with successively along light transmition direction: lighting source 1, taper optical wand 2, collimation lens set 3, Polarization converter 4, relay lens group 5, transmission type LCD micro display chip 7 and projection objective 8.System Working Principle and Figure 11 are similar, and the difference only micro display chip 7 in Figure 13 adopts the LCD of transmission-type, does not need through PBS prism 6, but be directly incident on LCD 7 surfaces from the light beam of relay lens group 5 outgoing.
Figure 14 shows that adopt that red, green, blue three monochromatic sources throw light on based on the multiplexing reflective LCoS/LCD micro-optical automotive engine system of P polarization state polarized light, be provided with successively along light transmition direction: lighting source 1, taper optical wand 2, collimation lens set 3, X-Cube color-combination prism 9, Polarization converter 4, relay lens group 5, PBS prism 6, reflective LCoS/LCD micro display chip 7 and projection objective 8.The light that three monochromatic illumination light sources 1 of red, green, blue send is through each self-corresponding taper optical wand and the even optical alignment of accurate lens combination, close look by X-Cube color-combination prism 9, then arrive reflective LCoS/LCD micro display chip 7 through Polarization converter 4, relay lens group 5 and PBS prism 6.Similar with Figure 12 System Working Principle, difference has only been used many monochromatic sources in Figure 14 system, need to close color device X-Cube color-combination prism 9 and close look.
System shown in Figure 15 principle of work and Figure 15 are similar, and three-color light source uses first to close color chips 91 and second and close color chips 92 and replace the X-Cube color-combination prism 9 in Figure 15.
Above embodiment; only for technical characterictic and the exploitativeness of this patent are described; its object is to make person skilled in art can understand the content of this patent and be implemented; although this patent is described with reference to specific embodiment; but; these descriptions should be interpreted as to a kind of restriction situation; for those skilled in the art with reference to obviously making the other embodiment to the various improvement in disclosed embodiment and this patent to the description of this patent above; all conversion of having done according to the design of this patent, all belong to the protection domain of this patent.
Claims (10)
1. based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that: set gradually lighting source (1) along light transmition direction, taper optical wand (2), collimation lens set (3), Polarization converter (4), relay lens group (5), PBS prism (6), micro display chip (7), and projection objective (8), the light beam that lighting source (1) sends is collimated lens combination (3) and collimates after the even light of taper optical wand (2) and pre-collimation, light beam after even optical alignment converts a kind of polarized light of polarization state to after Polarization converter (4) from nonpolarized light, be collected and be passed to micro display chip (7) surface and form uniform collimated illumination through follow-up relay lens group (5) and PBS prism (6), image on micro display chip (7) passes through projection objective (8) amplification imaging again on screen.
2. according to claim 1 based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that described taper optical wand (2) is for taper, its cross section is rectangle or pentagon, and taper optical wand (2) exit end face area is more than or equal to incident end face area, taper optical wand (2) is solid or hollow, solid cone shaped optical wand material is glass or plastics, conical hollow optical wand inside surface plated film is realized the total reflection in optical wand, rete adopts the method for electron beam evaporation to be coated with and to utilize light-operatedly to shake with quartz crystal that the method combining is carried out thicknesses of layers control or employing electro-plating method is coated with, described lighting source (1) is close to or is separated with the incident end end face of taper optical wand (2), or lighting source (1) is imbedded certain depth in taper optical wand (2) incident end end face.
3. according to claim 1 based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that described taper optical wand (2) exit end end face separates certain distance with the first lens of collimation lens set (3), the first lens of collimation lens set (3) are planes near the optical surface of taper optical wand (2); Or the first lens glue of the exit end end face of taper optical wand (2) and collimation lens set (3) is combined, the gummed optical surface of the first lens of collimation lens set (3) is plane; Or taper optical wand (2) all adopts optical plastic material with the first lens of collimation lens set (3), and the two is combined into a part injection moulding and makes.
4. according to claim 1 based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that the light beam that described lighting source (1) sends directly enters taper optical wand (2), can in 4mm, form uniform light-emitting area at the exit end end face of taper optical wand (2), this light-emitting area is upper at micro display chip (7) through collimation lens set (3) and relay lens group (5) amplification imaging successively, and enlargement ratio is the ratio square of the focal length of relay lens group (5) and collimation lens set (3).
5. according to claim 1 based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that Polarization converter (4) is made up of one PBS prism (411), a slice catoptron (421) and a slice half-wave plate (43); The optical axis of described relay lens group (5) overlaps with the central shaft of Polarization converter (4).
6. according to claim 5 based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that described half-wave plate (43) is arranged on time PBS prism (411) right side, unpolarized collimated light beam incides on the inferior PBS prism (411) of Polarization converter (4), be divided into two bundle polarized lights, be P polarization state light and S polarization state light, wherein S polarization state light is reflected the rear outgoing of mirror reflection, remain S polarization state light, P polarization state light is directly converted into S polarization state light through half-wave plate, be that the polarization state of unpolarized incident beam after Polarization converter (4) is converted into same S polarization state.
7. according to claim 5 based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that described half-wave plate (43) is arranged on catoptron (421) right side, unpolarized collimated light beam incides on the inferior PBS prism of Polarization converter (4), be divided into two bundle polarized lights, be P polarization state light and S polarization state light, wherein S polarization state light passes half-wave plate outgoing after being reflected mirror reflection, be converted to P polarization state light, the direct outgoing of P polarization state light unconverted, be that the polarization state of unpolarized incident beam after Polarization converter (4) is converted into same P polarization state.
According to described in claim 5 or 6 or 7 based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that described catoptron (421) can replace with right-angle prism, PBS prism or linear polarization grating, described inferior PBS prism (411) can replace with linear polarization grating; When described catoptron (421) replaces with prism, the inclined-plane of prism is coated with reflectance coating to strengthen reflection potential, rete adopts the method for electron beam evaporation to be coated with or is coated with electro-plating method, utilizes light-operatedly to shake with quartz crystal the method combining and carry out thicknesses of layers control while adopting the method for electron beam evaporation to be coated with.
9. according to claim 1 based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that the spacing of the 5mm that keeps certain between last a slice lens of described relay lens group (5) and PBS prism (6); Or last a slice lens and the PBS prism (6) of relay lens group (5) are glued together, and the optical surface of the nearly PBS prisms of last a slice lens (6) of relay lens group (5) is plane; Or last a slice lens of relay lens group (5) and PBS prism (6) adopt same material to make parts; Polarizer or the optical filter of polaroid or quarter wave plate and reflecting polarizer composition can be set between relay lens group (5) and PBS prism (6), to adjust contrast and the color indication range of micro projection optical engine.
10. according to claim 1 based on the multiplexing micro-optical automotive engine system of polarized light, it is characterized in that described micro display chip (7) is color-type or achromaticity type; Micro display chip (7) is color-type, be in the display unit on micro display chip (7), to have comprised the multiple pixel of red, green, blue, in the time that color-type micro display chip (7) is thrown light on by white light beam, by the color of each display unit of circuit control micro display chip (7), the coloured image on micro display chip (7) can go out coloured image at screen upslide through projection objective (8); Micro display chip (7) is achromaticity type, sequential chart picture by collaborative column of colour sequential switching and micro display chip (7) shows, the different colours image on micro display chip (7), after projection objective (8), can not project into different colours image on screen in the same time.
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| CN201410104633.7A CN103852897A (en) | 2014-03-20 | 2014-03-20 | Micro optical engine system based on reuse of polarized light |
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| CN104076588A (en) * | 2014-07-03 | 2014-10-01 | 复旦大学 | Polarization light splitting and combining prism set used for reflective LCD panel projector |
| CN106707668A (en) * | 2016-12-14 | 2017-05-24 | 浙江晶景光电有限公司 | Polarized light reuse imaging method and micro optical engine system based on optical wand |
| CN107543082A (en) * | 2017-10-18 | 2018-01-05 | 广东工业大学 | A kind of Fresnel Lenses for super brightness back light system |
| CN107587318A (en) * | 2016-07-07 | 2018-01-16 | 青岛海高设计制造有限公司 | A kind of laser light projection display system for washing machine |
| CN107843412A (en) * | 2016-09-20 | 2018-03-27 | 深圳市光峰光电技术有限公司 | Optical detection system and optical detection device |
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| CN104076588A (en) * | 2014-07-03 | 2014-10-01 | 复旦大学 | Polarization light splitting and combining prism set used for reflective LCD panel projector |
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| US10162181B2 (en) | 2015-12-03 | 2018-12-25 | Microsoft Technology Licensing, Llc | Display device with optics for brightness uniformity tuning having DOE optically coupled to receive light at central and peripheral regions |
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| CN107587318B (en) * | 2016-07-07 | 2020-02-21 | 青岛海高设计制造有限公司 | Laser projection display system for washing machine |
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| CN107543082A (en) * | 2017-10-18 | 2018-01-05 | 广东工业大学 | A kind of Fresnel Lenses for super brightness back light system |
| CN111413070A (en) * | 2020-04-13 | 2020-07-14 | 蔚海光学仪器（上海）有限公司 | Brightness detection device and detection method thereof |
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| CN113009759A (en) * | 2021-05-10 | 2021-06-22 | 杭州灵伴科技有限公司 | Miniature projection display device and AR display system |
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Application publication date: 20140611 |