CN1534313A - Reflector for converting polarization direction of polarized light and component element thereof - Google Patents
Reflector for converting polarization direction of polarized light and component element thereof Download PDFInfo
- Publication number
- CN1534313A CN1534313A CNA2004100058583A CN200410005858A CN1534313A CN 1534313 A CN1534313 A CN 1534313A CN A2004100058583 A CNA2004100058583 A CN A2004100058583A CN 200410005858 A CN200410005858 A CN 200410005858A CN 1534313 A CN1534313 A CN 1534313A
- Authority
- CN
- China
- Prior art keywords
- polarization
- polarized light
- incident
- light
- polarization direction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Polarising Elements (AREA)
Abstract
A method, apparatus and system for polarization conversion and recycling by using a half-pyramid shaped reflector with multiple reflective surfaces, or said reflector assembly, to obtain a desirable polarization rotation effect. The disclosed half-pyramid reflector comprises a plurality of reflective surfaces, which are formed so that an incoming beam passing perpendicularly through the entrant surface is reflected three times inside the device and leaves the exit surface with the direction of polarization being rotated 90 degrees. The preferred embodiments of polarization conversion systems using the invented apparatus are included. Without employing any waveplate component, the disclosed system is not sensitive to wavelength variations of the light source, temperature changes, and polarization alignment errors. Typical application of this invention includes polarization conversion and recycling for projection systems with polarization dependent spatial light modulation panels, such as LCD (Liquid Crystal Display) and LCOS (Liquid Crystal On Silicon).
Description
Technical field
The present invention relates to a kind of reverberator and assembly that improves the polarized light conversion efficiency, the repeatedly reverberator that wherein uses a kind of half square substrate pyramid reverberator and assembly thereof of unique design to be constituted is to realize the conversion of the needed polarized light of polarization conversion system polarization direction.The polarization conversion system that utilizes described reverberator or assembly to constitute is converted to useful polarized component once more with the useless polarized component of polarization conversion system generally, reclaims and circulation by polarized light, improves the conversion efficiency of polarization conversion system.
The invention belongs to optical technology and application thereof.
Background technology
Polarized light source is used widely in the optical projection system of LCD (liquid crystal display) and LCOS (liquid crystal on silicon).The normally used method of LCD projecting system polarized light source is to utilize polarization splitting prism (PBS) or reflective polarizing beam split runner plate to obtain to have the light beam of vertical and horizontal two polarization directions, that is, the light source of nonpolarized light is decomposed into two polarized light ingredients by polarization splitting prism: the s-polarized light and the p-polarized light of quadrature with it.Wherein, the s-polarized component is transmitted along reflection direction, and the p-polarized component is transmitted along transmission direction.A polarized light component by polarization splitting prism is useful polarized component, to be projected on the corresponding liquid crystal chip according to designing requirement, another polarized light component is another different direction of directive then, as not having the polarization recovery or the polarization circulation system in the system, this part polarized light energy can't be used, and have to lose.Therefore, in traditional reflection type polarization converting system, because the process of s-p polarized light conversion produces the loss up to the polarized component more than 50%, only have the luminous energy of half can be converted into useful polarized component at most in the light source, the light polarization conversion efficiency is very low.
General polarization splitting prism only can be applied to the incident angle of incident beam near 45 degree, and the less occasion of the numerical aperture of incident light.It is a kind of that disclosed wiregrating form polarization splitting prism can be applicable to the light beam vertical incidence, and the bigger occasion of the numerical aperture of incident light by United States Patent (USP) (patent No. 6,208,463 and the patent No. 6,243,199).
In recent years, there are many researchs to be devoted to explore the method that increases the light polarization conversion efficiency.Wherein, method in common is to use wave plate (waveplate) in polarization conversion system, with the combination of wave plate and polarization splitting prism, makes two components of polarization conversion all obtain utilizing.For example, by the introducing of half-wave plate, p-light is converted to s-light, or s-light is converted to p-light.Generally speaking, need in the system to add reflective mirror or prism again, make after the beam split once more the polarized light component of conversion and previous conversion polarized light component in the same way so that be used.This application can be referring to United States Patent (USP) (patent No. 6,046,856 and the patent No. 5,884,991).
Another kind of commonly used method is commonly referred to fly's eye, can wherein use the prism of the many groups PBS that arranges with array way referring to United States Patent (USP) (patent No. 6,337,759 and the patent No. 6,154,320), and the surface coating between the prism is spectro-film or reflectance coating.Light scioptics battle array optical module guiding prism array from light source.When a certain polarized component was directly passed prism array, another kind of polarized component is other to be incident upon the minute surface between the prism in the array, the latter with this polarized component guide arrangement the exit facet of wave plate silver.At exit facet, wave plate bar (Waveplate Strip) changes polarized component that the polarization direction makes it and the polarized component polarization direction by prism array is identical.By reclaiming the polarized light from the outgoing of wave plate bar, the fly's eye system has reached the purpose that improves polarization conversion efficiency.The width of lens element should be the twice of PBS prism elements width in the array, to utilize whole energy of field of illumination.
This shows that nearly all polarization conversion system is to reach the purpose that increases conversion efficiency at present, must use half-wave plate or quarter-wave plate (phase retardation plate) in system.Yet the use of wave plate in polarization converter brought some disadvantages inevitably.One of shortcoming of using wave plate is if that the wavelength departure centre wavelength of illuminating bundle, wave plate can't operate as normal.Another shortcoming is, wave plate is to the variation of angle of light degree and quite sensitive to the calibration error of polarization direction.Other shortcomings also comprise, the polymkeric substance wave plate is to the tolerance of high temperature and temperature variant poor stability etc.Although the wave plate made from crystal is high temperature resistant good with temperature change stability, cost is too high usually again.Therefore, the above-mentioned shortcoming of wave plate has often limited its practical application, especially at high light flux, and broadband, the application under the elevated operating temperature.
Some documents had once been introduced by using prism to finish the rotation and the conversion of polarization.For example, United States Patent (USP) 4,822,150 have delivered a kind of optical system that realizes the polarization rotation with the prism combination.United States Patent (USP) 4,252,410 have delivered a kind of method, use three or four reflectings surface to change the direction of polarized light polarization direction and beam propagation.United States Patent (USP) 5,751,482 have delivered the method for using the realization achromatism polarization rotation of right-angle prism system.But the disclosed system of foregoing invention can't be used in the actual polarization conversion system because its structure is too complicated bar none.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of polarized light conversion reflector and assembly of principle novelty, the useless polarized component of polarization conversion system generally is converted to useful polarized component is once more reclaimed, improve the conversion efficiency of polarization conversion system.
Secondly purpose of the present invention is to provide insensitive polarization conversion reverberator of a kind of wavelength variations to light source and assembly.
It is a kind of high temperature resistant and to insensitive polarization conversion reverberator of temperature variation and assembly that purpose once more of the present invention is to provide.
Another object of the present invention is to provide insensitive polarization conversion reverberator of a kind of calibration error and assembly to the polarization direction.
The polarization conversion reverberator and the assembly that another object of the present invention is to described invention do not use any wave plate, to replace the work of conventional polarization conversion device wave plate.
Another object of the present invention is to be general polarization conversion system, especially the polarizing light source system for using in projection and other display systems provides the polarized light of system to reclaim and the polarized light circulatory function, thereby improves the efficiency of light energy utilization.
In order to realize above-mentioned target, the invention discloses a kind of reverberator of half square substrate pyramid and the assembly that constitutes with described reverberator.Reverberator of the present invention and assembly have the logical stability of high light when reaching high polarization conversion efficiency, high temperature resistant, and be insensitive to the wavelength variations of light source, insensitive and to advantages such as the calibration error of polarization direction are insensitive to temperature variation.In addition, this reverberator and modular construction are simple, and manufacture craft is easy, and is with low cost, and combination makes the present invention that great actual application value all be arranged in different polarization conversion systems flexibly.The typical case uses the display system that comprises multiple use polarized light source, as LCD liquid crystal display and LCOS liquid crystal on silicon display projection system etc.
Objects and advantages of the present invention can be by obtaining explanation to following summary of the invention.
A kind of half square substrate pyramid reverberator of changing the incident polarized light polarization direction, by four surface compositions that meet following relation:
The incident of one polarized light and exit surface (S1) are the transmission plane of isosceles right triangle;
One first reflecting surface (S2), with above-mentioned incident and exit facet (S1) shape in angle of 45 degrees, extend back and described incident and exit facet and the handing-over of two other reflecting surface;
One second reflecting surface (S3) perpendicular to incident and exit facet (S1), extends back and incident and exit facet and the handing-over of two other reflecting surface;
One the 3rd reflecting surface (S4), with incident and exit facet (S1) shape in angle of 45 degrees, extend back and incident and exit facet and the handing-over of two other reflecting surface;
Polarized light by described transmission plane incident after, described three reflectings surface reflection through described half square substrate pyramid reverberator inside, during from described transmission plane outgoing, the polarisation of light direction is compared rotation one angle with incident beam.
Described half square substrate pyramid reverberator can be solid, hollow or open.
A kind of reflector assembly of changing the polarized light polarization direction is characterized in that: comprising the combination of a plurality of aforesaid half square substrate pyramid reverberators, in order to the polarization direction of conversion polarized light.
A kind of polarized light conversion recovery system is characterized in that:
At least comprise the above-mentioned reflector assembly that can change the incident polarized light polarization direction, and a polarization spectro block prism and a reflecting prism; The useless polarized component that described polarization spectro block prism separates, incide in the described reflector assembly, change the polarization direction through described reflector assembly, be converted to useful polarized component, pass through described reflecting prism again, transmit in the same way with the useful polarized component that described polarization spectro block prism separates.
A kind of polarized light conversion recovery system is characterized in that:
At least comprise the above-mentioned reflector assembly that can change the incident polarized light polarization direction and two the orthogonal strip polarization splitting prism of light splitting surface assemblies; Useless polarized component by a strip polarization splitting prism separation, enter described strip reflector assembly through behind another strip polarization splitting prism, be converted into useful polarized component through this strip reflector assembly, transmit in the same way through the useful polarized component of separating with a described strip polarization splitting prism after the transmission of described another strip polarization splitting prism again.
A kind of polarized illumination system is characterized in that:
At least comprise the above-mentioned reflector assembly that can change the incident polarized light polarization direction, polarization spectroscope, catoptron, light source, collimation lens, condenser lens and optical wand integrator; Light from light source incides described polarization spectroscope through collimation lens, the useless polarized component that produces after the polarization spectroscope beam split incides in the described reflector assembly, and the useful polarized component of being changed by described reflector assembly conducts to useful transmission direction by light path.
A kind of conversion cycle system of polarized light is characterized in that:
At least comprise the above-mentioned reflector assembly that can change the incident polarized light polarization direction, central through hole is as the light entrance port, optical wand integrator and reflective polarizing spectroscope; Behind the described reflective polarizing spectroscope of light process by described central through hole incident, useless polarized component is reflected back in the described smooth integrating rod, through the reflection in described smooth integrating rod, described useless polarized component is incided in the described reflector assembly, be converted to useful polarized component through described reflector assembly, be transmitted to useful transmission direction through described reflective polarizing spectroscope.
8. polarized illumination system that is used for liquid crystal flat panel display is characterized in that:
At least the above-mentioned reflector assembly that can change the incident polarized light polarization direction that comprises a matrix-like, light source, reverberator, wedge shape diffuser and beam-splitter; The useless polarized component that described matrix-like reflector assembly produces after with the beam-splitter beam split is converted to useful polarized component, transmits in the same way with the useful polarized component that beam-splitter has separated through diffuser and beam-splitter again.
Description of drawings
Fig. 1 is half square substrate pyramid reverberator perspective diagram and basic functional principle.
Fig. 2 (A)-2 (D) is the structural drawing of half a kind of concrete enforcement of square substrate pyramid reverberator shown in Figure 1-half square substrate pyramid reverberator, has shown the synoptic diagram of vertical incidence light light path in half square substrate pyramid reverberator simultaneously.
Fig. 3 is the synoptic diagram of oblique incidence light light path in half square substrate pyramid reverberator shown in Figure 2.
Fig. 4 is a kind of assembly of conversion incident polarized light polarization direction of the square plane of incidence, is formed by two half square substrate pyramid reflector combination shown in Figure 2.
Fig. 5 (A)-5 (C) is the assembly of the conversion incident polarized light polarization direction of the another kind of square plane of incidence, is formed by four half square substrate pyramid reflector combination shown in Figure 2.
Fig. 6 is that the partly reverberator of square substrate pyramid shown in Figure 1 is the hollow partly structural drawing of the another kind of specific embodiment of square substrate pyramid reverberator.
Fig. 7 is the assembly of the conversion incident polarized light polarization direction formed of a kind of hollow half square substrate pyramid reverberator of square entrance port, is formed by two hollow half square substrate pyramid reflector combination shown in Figure 6.
Fig. 8 (A)-8 (C) is the assembly of the hollow conversion incident polarized light polarization direction of another kind of square entrance port, is formed by four hollow half square substrate pyramid reflector combination shown in Figure 6.
Fig. 9 (A)-9 (D) is a kind of structural drawing of assembly of conversion incident polarized light polarization direction of strip, is formed by the combination of components of the conversion incident polarized light polarization direction of a plurality of above-mentioned square planes of incidence.
Figure 10 (A)-10 (C) is a kind of structural drawing of assembly of conversion incident polarized light polarization direction of array-like, is formed by the combination of components of the conversion incident polarized light polarization direction of a plurality of above-mentioned square planes of incidence.
Figure 11 is the principle of work synoptic diagram of a kind of polarization conversion of the present invention and polarization recovery system structure.
Figure 12 is the principle of work synoptic diagram of another kind of polarization conversion of the present invention and polarization recovery system structure.
Figure 13 is a kind of polarized light source illuminator that is used for optical projection system of the present invention.
Figure 14 (A)-14 (C) is a kind of polarization conversion, recovery and circulation system that is used for optical projection system of the present invention.
Figure 15 is a kind of polarized illumination system that is used for liquid crystal flat panel display of the present invention.
Embodiment
The present invention will set forth several specific embodiments by the detailed description of accompanying drawing.But, the example that the application of invention is not limited to enumerate.These specific embodiments only are applied in the multiple design configuration of polarization conversion and polarization recovery system, significant advantage and practical value in order to explanation the present invention.
Fig. 1 is half square substrate pyramid reverberator perspective structure and a principle of work synoptic diagram of the present invention.Half square substrate pyramid reverberator is with four summit A, C, and B and D and four surperficial S1, S2, S3, S4 represents.Wherein, the first surface S1 (BCD) of isosceles right triangle shape is the incident and the exit facet (incident and outgoing coplane) of light beam; Second surface S2 (CDA), the 3rd surperficial S3 (BAC) and the 4th surperficial S4 (DBA) have defined three adjacent reflectings surface respectively; Wherein, reflecting surface S3 is perpendicular to incident/exit facet S1, and the angle of reflecting surface S2 and S4 and face S1 is 45 degree; S1, S2, S3, S4 have surrounded the reverberator of half a square substrate pyramidal shape as shown in Figure 1.
The linear polarized beam 11 of vertical incidence exposes to surperficial S2 by surperficial S1, is reflected onto surperficial S3 by reflecting surface S2 again.Reflecting surface S3 continues folded light beam to surperficial S4.Finally, light beam reflexes to surperficial S1 outgoing by reflecting surface S4.As shown in Figure 1, by the triple reflection in half square substrate pyramid reverberator inside, outgoing polarized light 12 is when the reverse outgoing in S1 place, and the polarization direction is compared with incident polarized light 11 and reversed 90 degree.This phenomenon, promptly, polarized light by left side (or right side) vertical incidence of the half square substrate pyramid reverberator plane of incidence (S1), the phenomenon that the polarization direction is rotated by 90 degrees during by right side (or left side) outgoing of reverberator exit facet (S1) after the internal reflection three times, illustrated that half square substrate pyramid reverberator of the present invention can be used as desirable polarization converter device, light of non-useful polarization component in traditional polarized systems is changed once more, to reach the purpose that improves the polarized light conversion efficiency.
Fig. 2 (A)-2 (D) is half a kind of concrete enforcement of square substrate pyramid reverberator shown in Figure 1.Fig. 2 (A), Fig. 2 (B), Fig. 2 (C) and Fig. 2 (D) are respectively front elevation, side view, vertical view and the skeleton view of described half square substrate pyramid reverberator.Usually, surperficial S2, S3 and S4 should plate the rete of high reflectance, and surperficial S1 should plate anti-reflection film.
For the reverberator principle of work is described better, Fig. 2 has shown the light path synoptic diagram of vertical incidence light in half square substrate pyramid reverberator, polarized light 21 with vertical incidence is an example, has described the vertical incidence polarized light through three light paths until exit facet of internal reflection.In Fig. 2 (A), XY be Descartes with reference to the coordinate system plane, the Z axle is vertical and point out paper.In Fig. 2 (B), YZ be Descartes with reference to the coordinate system plane, X-axis is vertical and point to paper.In Fig. 2 (C), XZ be Descartes with reference to the coordinate system plane, Y-axis is vertical and point out paper.The direction that is oriented to light path of arrow.
Fig. 3 has further shown the synoptic diagram of oblique incidence light light path in half square substrate pyramid reverberator.Fig. 3 (A)-3 (D) is corresponding one by one with Fig. 2 (A)-2 (D), Fig. 3 (A), Fig. 3 (B), Fig. 3 (C) and Fig. 3 (D) be respectively described shown in front elevation, side view, vertical view and the skeleton view of reverberator.Fig. 3 (E)-3 (F) is for taking from the sectional view of Fig. 3 (A), and profile position is respectively E-E and the F-F among Fig. 3 (A).Descartes among Fig. 3 (A)-3 (D) is identical with 2 (A)-2 (D) with reference to the definition of coordinate system plane.YZ plane parallel among Fig. 3 (B) is in the plane of incidence of incident beam 31, i.e. E-E plane among Fig. 3 (A) and Fig. 3 (E).XZ plane parallel among Fig. 3 (C) is in the exit facet of outgoing beam 32, i.e. F-F plane among Fig. 3 (A) and Fig. 3 (F).
As shown in Figure 3, in being parallel to the E-E plane on YZ plane, the angle incident that polarized light 31 tilts with a certain relative Y-axis and Z axle.Polarized light 31 enters surperficial S1 (BCD) and refracts to surperficial S2 (CDA), and refractive direction is by the refractive index and the incident angle decision of air and glass.Light beam is reflected onto surperficial S3 by reflecting surface S2 again.Reflecting surface S3 continues folded light beam to surperficial S4.Light beam reflexes to surperficial S1 by reflecting surface S4.Finally, with the parallel plane F-F of XZ plane, light beam reflects from surperficial S1, leaves reverberator, as shown in Figure 3.Angle of inclination incident polarized light 31 is by the triple reflection in half square substrate pyramid reverberator inside, and the polarization direction of outgoing polarized light 32 is compared with incident polarized light 31 and rotated an angle.Polarization rotation under the condition of incidence of angle of inclination generally is not equal to 90 degree arbitrarily, or elliptic polarization occurs.The direction that is oriented to light path of arrow in the diagram.
Fig. 4 is a kind of assembly of conversion incident polarized light polarization direction of the square plane of incidence, is formed by two half square substrate pyramid reflector combination shown in Figure 2.The side of two reverberators (S3 shown in Figure 2) gummed links together, and the plane of incidence (S1 shown in Figure 2) coplane joins, and forms the transition components of the pyramidal polarized light polarization direction of a square plane of incidence.The assembly of described conversion incident polarized light polarization direction, half square substrate pyramid reverberator as forming it has the function of the polarization direction of conversion polarized light.Because the plane of incidence is a square, the transition components of pyramid polarized light polarization direction will have actual application value widely.
Fig. 5 (A)-5 (C) has shown the embodiment of assembly of the conversion incident polarized light polarization direction of the another kind of square plane of incidence, is formed by four half square substrate pyramid reflector combination shown in Figure 2.Fig. 5 (A), Fig. 5 (B) and Fig. 5 (C) are respectively front elevation, side view and the skeleton view of described assembly.The plane of incidence of the isosceles right triangle shape of four reverberators (S1 shown in Figure 2) is combined into a square plane of incidence by the splicing coplane; Four reverberators are outside perpendicular to the reflecting surface (S3 shown in Figure 2) of the plane of incidence/exit facet, form the outline of this assembly, as shown in Figure 5.The assembly of described conversion incident polarized light polarization direction, half square substrate pyramid reverberator as forming it has the function of the polarization direction of conversion polarized light.
Fig. 6 has shown the another kind of specific embodiments of Fig. 1 half square substrate pyramid reverberator, a kind of hollow half square substrate pyramid reverberator that forms that gluedd joint by thin mirror surface.Fig. 6 (A), Fig. 6 (B), Fig. 6 (C), Fig. 6 (D) are respectively front elevation, side view, vertical view and the skeleton view of described hollow half square substrate pyramid reverberator.Hollow half square substrate pyramid reverberator is made of three mirror surfaces, and the S1 of isosceles right triangle shape (BCD) is open beam inlet/exit face, surperficial S2 (CDA), and S3 (BAC) and S4 (DBA) they are mirror surfaces.Wherein reflecting surface S3 is perpendicular to inlet/outlet S1, and the angle of reflecting surface S2 and S4 and S1 is 45 degree; S2, S3, S4 have surrounded the reverberator of one and half square substrate pyramidal shape, and be similar with half square substrate pyramid reverberator shown in Figure 2.Identical with principle of work shown in Figure 1, after the polarized light of vertical incidence entered hollow half square substrate pyramid reverberator, reverberator internal reflection three times, the polarization direction of leaving the reverberator time was compared with incident beam and has been rotated 90 degree.Usually, specular surface S2, S3 and S4 should plate the rete of high reflectance.
Similar with half square substrate pyramid reverberator, the transition components that hollow half square substrate pyramid reverberator also can be neatly constitutes various polarized lights polarization direction by different array modes is applied in different polarization conversion and the polarization recovery system and goes.Fig. 7 is the transition components of a kind of square hollow pyramid polarized light polarization direction that enters the mouth of invention, is formed by two hollow half square substrate pyramid reflector combination shown in Figure 6.The side of two hollow reverberators (S3 shown in Figure 6) gummed link together (or with the two-sided minute surface replacement that is coated with the rete of high reflectance of a slice), inlet (S1 shown in Figure 6) coplane joins, and forms the transition components of the hollow pyramid polarized light polarization direction of a square inlet.
Fig. 8 (A)-8 (C) is the assembly of the hollow conversion incident polarized light polarization direction of another kind of square inlet, is formed by four hollow half square substrate pyramid reflector combination shown in Figure 6.Fig. 8 (A), Fig. 8 (B) and Fig. 8 (C) are respectively front elevation, side view and the skeleton view of described assembly.The inlet face of the isosceles right triangle shape of reverberator (S1 shown in Figure 6) splicing coplane is combined into a square inlet; Four reverberators are outside perpendicular to the reflecting surface (S3 shown in Figure 6) of inlet/outlet face, form the outline of this assembly, as shown in Figure 8.The assembly of described hollow conversion incident polarized light polarization direction, the hollow half square substrate pyramid reverberator as forming it has the function of the polarization direction of conversion polarized light.
Fig. 9 (A)-9 (D) is the structural drawing of the assembly of a kind of strip conversion incident polarized light of the present invention polarization direction, combination of components by a plurality of aforementioned conversion incident polarized lights polarization direction forms, and is applied to that polarization converter device is under the situation of list structure in the polarized systems.Instantiation will provide in Figure 12.Fig. 9 (A), Fig. 9 (B), Fig. 9 (C) and Fig. 9 (D) are respectively front elevation, side view, vertical view and the skeleton view of the assembly of described strip conversion incident polarized light polarization direction.The type of the assembly of combination strip conversion incident polarized light polarization direction is not limited to the assembly of strip conversion incident polarized light shown in Figure 9 polarization direction, for example, can form by following any reverberator: the assembly of Fig. 4 or conversion incident polarized light polarization direction shown in Figure 5, assembly of Fig. 7 or hollow conversion incident polarized light polarization direction shown in Figure 8 etc.The number of transmitter is decided on concrete application described in the assembly of strip conversion incident polarized light polarization direction.
Figure 10 (A)-10 (D) is the structural drawing of assembly of conversion incident polarized light polarization direction of a kind of array-like of invention, is formed by the combination of components of a plurality of conversion incident polarized lights shown in Figure 4 polarization direction.Figure 10 (A), Figure 10 (B) and Figure 10 (C) are respectively front elevation, side view and the skeleton view of assembly of the conversion incident polarized light polarization direction of described array-like.The type of the reverberator in the array is not limited to reverberator shown in Figure 10, for example, can be made up of the assembly of following any conversion incident polarized light polarization direction: Fig. 4 or pyramid shown in Figure 5 are changed the assembly of incident polarized light polarization direction, and Fig. 7 or hollow pyramid shown in Figure 8 are changed the assembly of incident polarized light polarization direction etc.The number of reverberator is decided on concrete application in the assembly array of the conversion incident polarized light polarization direction of array-like.Under the enough big situation in the aperture of polarized light transition components, compare with employing individual reflection device, the advantage of the assembly of the conversion incident polarized light polarization direction of employing array-like is that size reduces, alleviate the weight of device thus and reduce cost, and then increase the integrated level and the dirigibility of the design of whole polarization conversion system.
Figure 11 has shown a kind of reverberator or the polarization conversion of reflector assembly formation and principle sketch of polarization recovery system of using conversion incident polarized light of the present invention polarization direction.Non-polarized light beam 100 is decomposed into two polarized light ingredients via polarization splitting prism 101: the p-polarized light 111 and the s-polarized light 112 of quadrature with it.When Amici prism 101 was crossed in 111 transmissions of p-polarized light, s-polarized light 112 was reflected onto the below, impinges perpendicularly on the conversion reflector of half square substrate pyramid polarized light polarization direction or the inlet of reflector assembly 103.Described as prior figures 1 and Fig. 2, for the s polarized light of vertical incidence, the reverberator of conversion incident polarized light polarization direction or reflector assembly 103 will change its polarization direction makes the polarized light by the reverberator of changing the incident polarized light polarization direction or reflector assembly 103 outgoing become the light of p direction polarization.Therefore, as shown in the figure, cross Amici prism 101 by the p-polarized light transmission that the assembly 103 of conversion incident polarized light polarization direction change again, and then it is needed to reflex to system by right-angle prism 102,113 directions that the p-polarized light changed with Amici prism 101 111 is parallel.Like this, assembly and polarization conversion system by conversion incident polarized light of the present invention polarization direction, generally the useless polarized component that produces in the polarization conversion system can be exchanged into useful polarized component, will improve the conversion efficiency of polarization conversion system greatly after being used by recovery and circulation.The type of assembly 103 devices of conversion incident polarized light polarization direction is not limited to assembly shown in Figure 11, for example, can form by following any assembly: the assembly of Fig. 4 or conversion incident polarized light polarization direction shown in Figure 5, the assembly of Fig. 7 or hollow conversion incident polarized light polarization direction shown in Figure 8, the assembly of array-like conversion incident polarized light polarization direction shown in Figure 10 etc.
Figure 12 is the principle of work synoptic diagram of another kind of polarization conversion and polarization recovery system structure, and system has comprised the assembly of a plurality of strips shown in Figure 9 conversion incident polarized lights polarization direction and has been used in a plurality of strip polarization splitting prism assemblies in the fly lens structure.Figure 12 (A) and Figure 12 (B) are the front elevation and the skeleton view of described polarization conversion system.Non-polarized light beam 120 from fly lens structure (not shown) impinges perpendicularly on first group of strip polarization splitting prism group 121, and the latter is decomposed into two polarized light ingredients with it: p-polarized light and s-polarized light.Polarization splitting prism group 121 is crossed in 124 transmissions of p-polarized light, and the s-polarized light is reflected onto the below, is further reflexed to the inlet of the assembly 123 of strip conversion incident polarized light polarization direction subsequently by second group of polarization splitting prism group 122.As previously mentioned, the polarized light of assembly 123 outgoing of strip conversion incident polarized light polarization direction will become the light of p direction polarization, polarization splitting prism group 122 is crossed in transmission, the latter changes this part p-polarized light (polarized light 125) that the assembly of incident polarized light polarization direction changes again with strip and transfers to the direction parallel with the p-polarized light 124 of strip polarization splitting prism group 121 conversions, shown in Figure 12 (A).Same polarization conversion and polarization recovery process appear at the strip of other row and change in the assembly and the combination of strip polarization splitting prism of incident polarized light polarization direction, the useless polarized component that will be generally produces in the polarization conversion system with the method is converted to useful polarized component, is recycled.
Figure 13 has shown a kind of assembly of the conversion incident polarized light polarization direction that utilizes invention and the polarized illumination system that is used for optical projection system that designs.Light from light source 131 reflexes to collimation lens 133 through elliptical reflector 132.From the collimation directional light of the right side outgoing of collimation lens 133 is nonpolarized light, after projecting polarization spectroscope 134, polarization spectroscope 134 is crossed in 130 transmissions of p-polarized component, and the s-polarized light is reflected onto the below, impinges perpendicularly on the inlet of the assembly 135 of conversion incident polarized light polarization direction.As previously mentioned, for the s polarized component of vertical incidence, the transition components 135 of incident polarization light polarization direction will change its polarization direction, and feasible polarized light by assembly 135 outgoing of changing the incident polarized light polarization direction becomes the p polarized component.Polarization spectroscope 134 is crossed in p polarized component 139 transmissions by transition components 135 conversion of incident polarization light polarization direction, reflexes to the direction parallel with the p polarized component 130 of polarization spectroscope 134 conversions by catoptron 136 again.Condenser lens 137 will and converge to the porch of optical wand integrator 138 from the p polarized component 139 of catoptron 136 from the p polarized component 130 of polarization spectroscope 134.
For the polarized illumination system that uses based on the optical projection system of LCD or LCOS liquid crystal light valve, the optical wand integrator 138 among Figure 13 has the shape of pros or long section usually to mate with the liquid crystal light valve plate.The type of the assembly 135 of conversion incident polarized light polarization direction is not limited to assembly shown in Figure 13, for example, can form by following any assembly: the assembly of Fig. 4 or conversion incident polarized light polarization direction shown in Figure 5, the assembly of Fig. 7 or hollow conversion incident polarized light polarization direction shown in Figure 8, the assembly of array-like conversion incident polarized light polarization direction shown in Figure 10 etc.In addition, polarization spectroscope 134, catoptron 136, optical wand integrator 138 also can be accordingly by the polarization splitting prism cubes, and right-angle prism and hollow optical wand integration pipe replace.
Figure 14 (A)-14 (C) has shown that the assembly of hollow conversion incident polarized light polarization direction of the present invention in the optical projection system polarization conversion, reclaims and a kind of application of round-robin.System can be used for providing the linear polarization light source for LCD or LCOS liquid crystal light valve.Figure 14 (A), Figure 14 (B) and Figure 14 (C) are respectively front elevation, side view and the skeleton view of described system.Shown in Figure 14 (A)-14 (C), hollow half a square substrate pyramid reflector assembly 141 as shown in Figure 8, there is an aperture 144 at the center as the light entrance port, is installed in the left end of hollow optical wand integration pipe 143.Hollow optical wand integration pipe 143 is made up of four thin runner plates, to form the reflecting surface of inside pipe wall high reflectance.A reflective polarizing spectroscope 142 (PBS of wire grating form or other reflective PBS) is installed in the other end of hollow optical wand integration pipe 143.
Incident light passes aperture 144, after repeatedly being reflected by hollow optical wand integration pipe 143 inwalls, arrives the reflective polarizing spectroscope 142 of port.P light transmission polarization spectroscope 142, s light are reflected back toward optical wand integration pipe 143, arrive hollow mirror half square substrate pyramid reflector assembly 141.As previously mentioned, for the s light that impinges perpendicularly on half square substrate pyramid reflector assembly 141, the light that is returned again by half square substrate pyramid reflector assembly 141 becomes p light, and for the s light of oblique incidence, the light that part is returned becomes p light.After partly the light of square substrate pyramid reflector assembly 141 reflected backs repeatedly reflects even light through hollow optical wand integration pipe 143 inwalls, arrive port once more.At polarization spectroscope 142 places of port, the p light transmission, remaining s light component returns, and enters aforementioned transfer process once more.By circulating repeatedly and reclaiming by the useful polarization p component of hollow mirror reflection device assembly 141 conversions, system has reached the purpose that improves the polarization conversion efficiency and the efficiency of light energy utilization.
Other examples before enumerated and embodiment similar, the reflector assembly 141 among Figure 14 are the critical components that improve the conversion efficiency of polarization conversion system.The type of the assembly 141 of conversion incident polarized light polarization direction is not limited to device shown in Figure 14, can form by the reverberator of half square substrate pyramid of any square inlet or triangular inlet or the assembly of conversion incident polarized light polarization direction, for example, half square substrate pyramid reverberator shown in Figure 2, the half hollow reverberator of square substrate pyramid shown in Figure 6, the assembly of Fig. 4 or conversion incident polarized light polarization direction shown in Figure 5, the transition components of Fig. 7 or hollow incident polarization light polarization direction shown in Figure 8, the assembly of array-like conversion incident polarized light polarization direction shown in Figure 10 etc., after being equipped with the entrance port of careful through hole as light, all can be selected according to system's actual needs.Solid optical wand integrator, the port plating can replace hollow optical wand integration pipe 143 and polarization spectroscope 142 for reflective PBS.
Figure 15 has shown the half a kind of application of square substrate pyramid type reverberator in liquid crystal flat panel display of the present invention.Light from light source 151 reflects through reverberator 152, enters wedge shape diffuser 153.Diffuser can be sneaked into another kind of transparent material substrate by a kind of particle of transparent material and be made.For example United States Patent (USP) 5,982, and 540 a kind of diffusers of delivering are 1.4345 silicon resin particle by 2 microns refractive indexes of diameter, and to sneak into refractive index with the ratio of weight ratio 0.07% be that 1.492 PMMA plastic base is made.From the light of light source 151 through reflection of diffuser 153 upper and lower surfaces and scattering-in after directive beam-splitter 154.The p light that sees through beam-splitter 154 is useful polarized component.S light component by beam-splitter 154 reflections is incident to half square substrate pyramid type reflector array 155 through diffuser 153, after reflector array 155 reflections, change the p polarized component into, see through diffuser 153 and beam-splitter 154 outgoing again, transmit in the same way with the useful polarized component that beam-splitter 154 has separated.
By the several typical application implementation scheme of the present invention in LCD projecting system and liquid crystal flat-panel display system, explanation is in the system that has used reverberator of the present invention or reflector assembly, be reflected device or reflector assembly of the useless polarized component that polarizer produces is converted to useful polarized component once more, this component is made full use of by system by recovery or round-robin method, thereby help system has realized the rotation of polarized light, conversion, reclaim and circulatory function, improved the polarized light conversion efficiency and the efficiency of light energy utilization greatly.Feature of the present invention is: because described invention device has replaced traditional wave plate, the application system of device of the present invention need not to use wave plate, make system when reaching high polarization conversion efficiency, have logical stability of high light and heat-resisting quantity, wavelength variations to light source is insensitive, insensitive to temperature variation, to advantage such as the calibration error of polarization direction is insensitive.System architecture of the present invention is simple, and manufacture craft is easy, and is with low cost, combination flexibly, so system of the present invention can be widely used in the polarization conversion system of various different structures and purposes, has great actual application value.
Claims (8)
1. half square substrate pyramid reverberator of changing the incident polarized light polarization direction, by four surface compositions that meet following relation:
The incident of one polarized light and exit surface (S1) are the transmission plane of isosceles right triangle;
One first reflecting surface (S2), with above-mentioned incident and exit facet (S1) shape in angle of 45 degrees, extend back and described incident and exit facet and the handing-over of two other reflecting surface;
One second reflecting surface (S3) perpendicular to incident and exit facet (S1), extends back and incident and exit facet and the handing-over of two other reflecting surface;
One the 3rd reflecting surface (S4), with incident and exit facet (S1) shape in angle of 45 degrees, extend back and incident and exit facet and the handing-over of two other reflecting surface;
Polarized light by described transmission plane incident after, described three reflectings surface reflection through described half square substrate pyramid reverberator inside, during from described transmission plane outgoing, the polarisation of light direction is compared rotation one angle with incident beam.
2. half square substrate pyramid reverberator of conversion polarized light as claimed in claim 1 polarization direction is characterized in that described reverberator can be solid, hollow or open.
3. a reflector assembly of changing the polarized light polarization direction is characterized in that: comprising a plurality of combinations as the described half square substrate pyramid reverberator of claim 1 to 2, in order to the polarization direction of conversion polarized light.
4. a polarized light is changed recovery system, it is characterized in that:
At least comprise the described reflector assembly that can change the incident polarized light polarization direction of claim 3, and a polarization spectro block prism and a reflecting prism; The useless polarized component that described polarization spectro block prism separates, incide in the described reflector assembly, change its polarization direction through described reflector assembly, be converted to useful polarized component, pass through described reflecting prism again, transmit in the same way with the useful polarized component that described polarization spectro block prism separates.
5. a polarized light is changed recovery system, it is characterized in that:
At least described reflector assembly and two the orthogonal strip polarization splitting prism of the light splitting surface assemblies that can change the incident polarized light polarization direction of claim 3 that comprise a strip; Useless polarized component by a strip polarization splitting prism separation, enter described strip reflector assembly through behind another strip polarization splitting prism, be converted into useful polarized component through this strip reflector assembly, transmit in the same way through the useful polarized component of separating with a described strip polarization splitting prism after the transmission of described another strip polarization splitting prism again.
6. polarized illumination system is characterized in that:
At least comprise the described reflector assembly that can change the incident polarized light polarization direction of claim 3, polarization spectroscope, catoptron, light source, collimation lens, condenser lens and optical wand integrator; Light from light source incides described polarization spectroscope through collimation lens, the useless polarized component that produces after the polarization spectroscope beam split incides in the described reflector assembly, and the useful polarized component of being changed by described reflector assembly conducts to useful transmission direction by light path again.
7. the conversion cycle system of a polarized light is characterized in that:
At least comprise the described reflector assembly that can change the incident polarized light polarization direction of claim 3, central through hole is as the light entrance port, optical wand integrator and reflective polarizing spectroscope; Behind the described reflective polarizing spectroscope of light process by described central through hole incident, useless polarized component is reflected back in the described smooth integrating rod, through the reflection in described smooth integrating rod, described useless polarized component is incided in the described reflector assembly, be converted to useful polarized component through described reflector assembly, be transmitted to useful transmission direction through described reflective polarizing spectroscope.
8. polarized illumination system that is used for liquid crystal flat panel display is characterized in that:
At least comprise the described reflector assembly that can change the incident polarized light polarization direction of matrix-like claim 3, light source, reverberator, wedge shape diffuser and beam-splitter; The useless polarized component that described matrix-like reflector assembly produces after with the beam-splitter beam split is converted to useful polarized component, transmits in the same way with the useful polarized component that beam-splitter has separated through diffuser and beam-splitter again.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/249,356 US7097315B2 (en) | 2002-11-07 | 2003-04-02 | Polarization conversion and recycling method and apparatus |
| US10/249,356 | 2003-04-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1534313A true CN1534313A (en) | 2004-10-06 |
| CN1280643C CN1280643C (en) | 2006-10-18 |
Family
ID=34311994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410005858 Expired - Fee Related CN1280643C (en) | 2003-04-02 | 2004-02-20 | Reflector for converting polarization direction of polarized light and component element thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1280643C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102236117A (en) * | 2011-04-28 | 2011-11-09 | 成都比特王科技有限责任公司 | Rectangular pyramid structure capable of reversely reflecting at 180 degrees or deflecting at specified angle |
| CN102662206A (en) * | 2012-05-23 | 2012-09-12 | 北京科技大学 | Angle reflector and angle reflector array |
| CN101363990B (en) * | 2007-08-08 | 2013-02-06 | 奇美电子股份有限公司 | Polarizing diaphragm and display apparatus using the same |
| WO2014187107A1 (en) * | 2013-05-24 | 2014-11-27 | 京东方科技集团股份有限公司 | Light ray conversion device, backlight module and display device |
| CN107272307A (en) * | 2016-04-08 | 2017-10-20 | 信泰光学(深圳)有限公司 | Projection arrangement |
| CN114895445A (en) * | 2022-05-19 | 2022-08-12 | 湖北久之洋红外系统股份有限公司 | 180-degree reflecting prism group with image translation characteristic |
| CN114895446A (en) * | 2022-05-19 | 2022-08-12 | 湖北久之洋红外系统股份有限公司 | 180-degree reflecting prism capable of rotating image by 90 degrees |
-
2004
- 2004-02-20 CN CN 200410005858 patent/CN1280643C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101363990B (en) * | 2007-08-08 | 2013-02-06 | 奇美电子股份有限公司 | Polarizing diaphragm and display apparatus using the same |
| CN102236117A (en) * | 2011-04-28 | 2011-11-09 | 成都比特王科技有限责任公司 | Rectangular pyramid structure capable of reversely reflecting at 180 degrees or deflecting at specified angle |
| CN102662206A (en) * | 2012-05-23 | 2012-09-12 | 北京科技大学 | Angle reflector and angle reflector array |
| CN102662206B (en) * | 2012-05-23 | 2014-09-17 | 北京科技大学 | Angle reflector and angle reflector array |
| WO2014187107A1 (en) * | 2013-05-24 | 2014-11-27 | 京东方科技集团股份有限公司 | Light ray conversion device, backlight module and display device |
| CN107272307A (en) * | 2016-04-08 | 2017-10-20 | 信泰光学(深圳)有限公司 | Projection arrangement |
| CN114895445A (en) * | 2022-05-19 | 2022-08-12 | 湖北久之洋红外系统股份有限公司 | 180-degree reflecting prism group with image translation characteristic |
| CN114895446A (en) * | 2022-05-19 | 2022-08-12 | 湖北久之洋红外系统股份有限公司 | 180-degree reflecting prism capable of rotating image by 90 degrees |
| CN114895445B (en) * | 2022-05-19 | 2024-05-28 | 湖北久之洋红外系统股份有限公司 | 180-Degree reflecting prism group with image translation characteristic |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1280643C (en) | 2006-10-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1132031C (en) | Lenticular polarization converter | |
| US5940149A (en) | Planar polarizer for LCD projectors | |
| CN1064459C (en) | Overhead projector with catadioptric fresnel lens | |
| CN101432640B (en) | Polarizing turning film | |
| JP3488467B2 (en) | Illumination system using an array of microprisms | |
| CN1278139C (en) | Subwavelength optical microstructure light collimating films | |
| US20080030974A1 (en) | LED-Based Illumination System | |
| CN1636159A (en) | Polarization recovery system for projection displays | |
| JPH10511803A (en) | Illumination system using an array of microprisms | |
| CN1621891A (en) | Lighting device and projector | |
| CN1280643C (en) | Reflector for converting polarization direction of polarized light and component element thereof | |
| JP3532212B2 (en) | Irradiation equipment using multi-sided micro prism array | |
| CN1153994C (en) | Prismatic light beam homogenizer for projection displays | |
| CN1445563A (en) | Integrated lamp optical system and projector with the system | |
| CN110412817A (en) | Projection arrangement and lighting system | |
| CN1536391A (en) | Optical lighting system and image projection system containing it | |
| US20040090763A1 (en) | Polarization Conversion and Recycling Method and Apparatus | |
| CN1670565A (en) | Polarisation conversion optical system | |
| US7301701B2 (en) | Compact polarization conversion system for optical displays | |
| CN1779551A (en) | Optical engine and projector therewith | |
| Schreiber et al. | Microoptics for homogeneous LED illumination | |
| CN1721981A (en) | Screen and projector | |
| TW524994B (en) | Optical S-P converter | |
| JPH03223811A (en) | Polarized light converting element for light source | |
| CN212989862U (en) | High-efficient lighting system of LCD projector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20061018 Termination date: 20100220 |