CN1664694A - Polarization reclamation lighting system - Google Patents
Polarization reclamation lighting system Download PDFInfo
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- CN1664694A CN1664694A CN 200410006434 CN200410006434A CN1664694A CN 1664694 A CN1664694 A CN 1664694A CN 200410006434 CN200410006434 CN 200410006434 CN 200410006434 A CN200410006434 A CN 200410006434A CN 1664694 A CN1664694 A CN 1664694A
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Abstract
This invention relates to a polarized recovering and lighting system, characterized in mounting the incident face of columnar light communication channel in the focal point of oval shaped reflector primarily by means of oval shaped reflector, polarized converter and at least two plates of lens, imaging the light formed by said channel outgoing face via polarizing light converter on display board in need of illumination, reaching the effect of light uniformity and polarized light conversion.
Description
Technical field
The present invention relates to a kind of polarisation and reclaim illuminator, be applied on the optical projection system of liquid crystal micro video picture panel, relate in particular to a kind of polarisation of column optical channel pipe that uses and reclaim illuminator.
Background technology
Present employed condenser system or be called integrator (integrator) in the liquid crystal projector for the light that light source sent being become evenly and circular distribution is converted to the distribution of the rectangle (4: 3 or 16: 9) of display panel.Figure 1A and Figure 1B are two kinds of common integrators.
Wherein the light that sent of light source 10 is divided into several blocks (4: 3 or 16: 9 rectangular profile) to the light that is sent through the first lens arra group 20, and light source 10 is imaged on second lens arra 30.Second lens arra 30 all is superimposed upon on the display panel 40 to the first lens arra group, 20 residing positions again.See Figure 1B again, the light that light source 10 sends can form a uniform light at its exit facet behind column glass 25, via condenser 35 it is overlapped on the display panel 40 more afterwards.
Most liquid crystal projector (liquid crystal projector) all utilizes the characteristic of polarized light to do the modulation of light intensity, therefore above-mentioned method is used less than half energy of lighting source 10, also be, its polarized light energy of polarized light other direction that uses a certain direction of light source 10 then is absorbed, and causes the energy loss of light source quite big.Therefore, how the energy of second half loss is fetched utilization again, just become and promote one of effective method of liquid crystal projector luminance brightness.
Because the restriction of the second law of thermodynamics, if will convert a branch of nonpolarized light to polarized light the time, it can cause the angle of divergence of light to become big and make the sectional area of light become big.The contrast of optical system the angle of divergence of light become big, is unfavorable for the optical system of crystal projection, because can become big and descends along with the angle that is incident in display panel.Concerning the sectional area of light become big, though be not suitable for little display panel system at present, under the situation that the light source arc distance is done littler and littler, can make the beam smaller of lighting source, so can use the big method of light beam change to do polarization conversion technique.
For in response to the problems referred to above, the applicant once proposed a kind of " rod integrator polarization converter " (No. 400454 patent of TaiWan, China patent announcement), utilize the plane of incidence of column glass to be positioned on the focus of elliptical reflector, and the light that forms at the exit facet of column glass make on the liquid crystal board of photoimaging in required illumination via condenser and polarisation converter.Yet, declare the content array because of preceding case in the practical application and can be imaged on second lens, this can make the excessive and array image-forming of the incident angle of array image-forming big or small can't and the polarisation converter between make the not good and illustrated polarisation recovering effect of case before can't reaching of light conversion efficiency every the width coupling.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of polarisation to reclaim illuminator, can effectively utilize the luminous energy that light source provides, and increases illumination efficiency, and utilizes lens still less, more reduces cost.
To achieve these goals, the invention provides a kind of polarisation and reclaim illuminator,, include in order to the display panel that throws light on:
One light source is positioned on the focus of an elliptical reflector;
One column optical channel pipe, have a plane of incidence and an exit facet, another focus of this elliptical reflector is positioned on this plane of incidence, and this plane of incidence is in order to receiving the light from this light source, and forms an imaginary light source array at this exit facet outgoing one equally distributed light and in this plane of incidence position;
One supplementary lens is positioned at outside the exit facet of this column optical channel pipe, makes this imaginary light source array image-forming form a real image array of source;
One polarisation converter is positioned at this supplementary lens one side, in order to receive this real image array of source and to convert each light in this real image array of source to a plurality of specific polarization light; And
One rearmounted lens are between this polarisation converter and this display panel, in order to this specific polarization light is overlapped in this display panel.
Above-mentioned polarisation reclaims illuminator, wherein, this polarisation converter also comprises a plurality of polarizing beam splitters and a plurality of 1/2 ripple plate, the described polarizing beam splitter angle that tilts is arranged with parallel mode and is formed, and described 1/2 ripple plate is arranged in wherein between two described polarizing beam splitters in one mode at interval.
Above-mentioned polarisation reclaims illuminator, and wherein, this polarizing beam splitter has multicoating.
Above-mentioned polarisation reclaims illuminator, and wherein, this angle is 45 °.
Above-mentioned polarisation reclaims illuminator, and wherein, this light source is an xenon lamp.
Above-mentioned polarisation reclaims illuminator, and wherein, this light source is a Halogen lamp LED.
Above-mentioned polarisation reclaims illuminator, and wherein, this light source is a high-pressure sodium lamp.
Above-mentioned polarisation reclaims illuminator, and wherein, this light source is a metal halide lamp.
Above-mentioned polarisation reclaims illuminator, and wherein, this light source is a light emitting diode.
Above-mentioned polarisation reclaims illuminator, and wherein, this supplementary lens group comprises the above lens of a slice, and should the postposition lens combination comprise the above lens of a slice.
Above-mentioned polarisation reclaims illuminator, and wherein, this supplementary lens and this postposition lens are all a non-globe lens.
Above-mentioned polarisation reclaims illuminator, and wherein, this supplementary lens is a non-globe lens, and should comprise two globe lenss by the postposition lens.
Above-mentioned polarisation reclaims illuminator, and wherein, this supplementary lens comprises two globe lenss, and should the postposition lens be a non-globe lens.
Above-mentioned polarisation reclaims illuminator, and wherein, this supplementary lens and this postposition lens all comprise two globe lenss.
Above-mentioned polarisation reclaims illuminator, and wherein, the xsect of this column optical channel pipe is square.
Disclosed polarisation reclaims illuminator according to the present invention, for including light source, column optical channel pipe, supplementary lens, rearmounted lens and polarisation converter, light source is positioned on the focus of elliptical reflector, another focus is positioned on the plane of incidence of column optical channel pipe, and at the equally distributed light of exit facet outgoing of column optical channel pipe, and at plane of incidence position formation imaginary light source array, and utilize supplementary lens, make the imaginary light source array image-forming form the real image array of source and convert a plurality of specific polarization light to rearmounted lens, and specific polarization light is overlapped in display panel in the polarisation converter and with each light in this real image array of source.
By system of the present invention the optical efficiency of optical system is improved, and the energy of the polarized light of second half loss is fetched utilization again.The present invention can be converted into a light beams of light source two bundles can be shown the polarized light that panel utilizes, so beam cross section is long-pending becomes original two times, but intensity only is original half.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Figure 1A, Figure 1B are existing lighting device synoptic diagram;
Fig. 2 is a structural representation of the present invention;
Fig. 3 is converted into the synoptic diagram of specific polarized light for the array of source real image;
Fig. 4 is the principle schematic of polarisation converter; And
Fig. 5 A～Fig. 5 C is embodiments of the invention figure.
Embodiment
Please refer to Fig. 2, polarisation reclaims illuminator and comprises light source 102, column optical channel pipe 110, supplementary lens 120, rearmounted lens 140, polarisation converter 134.Wherein light source 102 is positioned at first focal point F of elliptical reflector 104
1On, the geometrical property by elliptical area can will be positioned at focal point F
1On the light that light source sent via the mirror focusing of elliptical reflector 104 in second focal point F
2On.Wherein light source 102 can be Halogen lamp LED and various arc lamp (arc lamp), as high-pressure sodium lamp, metal halide lamp, xenon (Xenon) lamp, the sufficiently high light source of light emitting diode total lumens (luminance) such as (LED) number.
Column optical channel pipe 110 two ends are respectively plane of incidence 112a and exit facet 112b, and plane of incidence 112a is positioned on second focal point F 2 of elliptical reflector 104, in order to receive the light from light source 102.In first focal point F
1On the light of light source 102 reflex to second focal point F via elliptical reflector 104
2On, enter in the column optical channel pipe 110 by plane of incidence 112a.
Light can produce total reflection in column optical channel pipe 110, and produces imaginary light source array 114 at plane of incidence 112a place.Because all enter the angle of incident light difference of column optical channel pipe 110, in column optical channel pipe 110, can produce the total reflection of different number of times.As in column optical channel pipe 110, producing the light of a total reflection, again the light reflected backstepping is gone back to pool an imaginary light source 114a; In like manner, produce secondary total reflection meeting and pool another imaginary light source, so just produce an imaginary light source array 114 at plane of incidence 112a.Each imaginary light source 114a all with different angular illumination on exit facet 112b, by the kaleidoscope effect luminous energy of exit facet 112b is evenly distributed with the position again.
The light that polarisation converter 134 is used for not having polarization converts to and can be shown the used polarized light of panel 150, as the P polarized light, as shown in Figure 3, each light source 114a of imaginary light source array 114 is imaged on the polarisation converter 134, and produces a real image array of source 138.Each real image light source 138a of real image array of source 138 is divided into P polarized light and S polarized light through polarisation converter 134 with light again, and again the S polarized light is converted to P polarized light (suppose display panel only accept the P polarized light), improve the optical efficiency of optical projection system whereby.
Then please refer to shown in Figure 4, polarisation converter 134 is by being made of a plurality of polarizing beam splitter 134a and a plurality of 1/2 ripple plate 134b, each polarizing beam splitter 134a is to tilt an angle, as 45 °, arrange with parallel mode and to form, and this 1/2 wavelength plate 134b is arranged in wherein between two polarizing beam splitter 134a in one mode at interval.Above-mentioned polarizing beam splitter 134a is a multicoating, and it can allow a certain polarized light pass through, and as the P polarization, and allows another polarized light reflect, as the S polarization.
After the real image light source 138a of real image array of source 138 is incident to polarisation converter 134, when arrival polarizing beam splitter 134a goes up, the P polarized light in the incident ray is reflected by making the S polarized light.After the S polarized light is polarized optical splitter 134a reflection, through the reflection of an adjacent polarizing beam splitter 134a, make it be incident to one 1/2 ripple plate 134b again, 134b can be converted to the S polarized light P polarized light by this 1/2 ripple plate.Thus figure as can be seen, polarisation reclaims a wherein light beams of illuminator 134, as 138a, is converted into two bundle polarized lights, so beam cross section is long-pending becomes original two times, but intensity only is original half.
At this moment, the light that penetrates from polarisation converter 134 just is the P polarized light fully, again via rearmounted lens 140 optically focused, makes the real image light source 138a that is converted into specific polarization light can be overlapped on the display panel 150.
Wherein, supplementary lens 120 is used for controlling imaginary light source array 114 and is imaged on f number on the polarisation converter 134 (when f#＞5.5, can obtain polarization conversion efficiency preferably), and rearmounted lens combination 140 for control integral illumination system to the video picture panel f number and uniformity coefficient (f# among the present invention is burnt number, is the ratio of effective focal length divided by the entrance pupil diameter; The irradiation energy of being accepted on the more little expression video picture of the illuminator f# panel is big more, incident angle is also big more simultaneously, but therefore its overall contrast may descend, and rearmounted lens combination can effectively reduce from axle with make its uniformity coefficient preferable than the aberration of high angle scattered light).Wherein supplementary lens 120 all can be non-globe lens (see figure 2) with rearmounted lens 140, structure is then fairly simple, but cost is higher, perhaps referring to shown in Fig. 5 A, 5B, the 5C, wherein a lens design is for including two globe lenss, supplementary lens 120 can be designed to include two globe lenss, or rearmounted lens 140 are designed to include two globe lenss.Save cost more as needs, then supplementary lens 120 and rearmounted lens 140 all can be designed to include two globe lenss.On the other hand, also can increase an array lens again between supplementary lens 120 and polarisation converter 134, can improve effect slightly, remaining lens devices also is identical principle, is not repeated at this.
Therefore, feature of the present invention is that position configuration one polarisation at minimum place of the source imaging luminous point of system and the minimum place of the angle of divergence reclaims illuminator, simultaneously the luminous energy that light source is provided can be effectively utilized to obtain best polarization conversion effect, more illumination efficiency can be increased.Simultaneously, compared to preceding case, the f number of control virtual image array image-forming on PS Converter (when f#＞5.5 can obtain polarization conversion efficiency preferably, reality can reach more than 85%); And be the design of the heart far away, preferable tolerance is arranged when allowing polarization converter put.And rearmounted lens combination can be in order to the uniformity coefficient of light source on control f# of illuminator and the panel, and can solve the not good problem of its light conversion efficiency.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (15)
1, a kind of polarisation reclaims illuminator, in order to the display panel that throws light on, it is characterized in that, includes:
One light source is positioned on the focus of an elliptical reflector;
One column optical channel pipe, have a plane of incidence and an exit facet, another focus of this elliptical reflector is positioned on this plane of incidence, and this plane of incidence is in order to receiving the light from this light source, and forms an imaginary light source array at this exit facet outgoing one equally distributed light and in this plane of incidence position;
One supplementary lens is positioned at outside the exit facet of this column optical channel pipe, makes this imaginary light source array image-forming form a real image array of source;
One polarisation converter is positioned at this supplementary lens one side, in order to receive this real image array of source and to convert each light in this real image array of source to a plurality of specific polarization light; And
One rearmounted lens are between this polarisation converter and this display panel, in order to this specific polarization light is overlapped in this display panel.
2, polarisation according to claim 1 reclaims illuminator, it is characterized in that, this polarisation converter also comprises a plurality of polarizing beam splitters and a plurality of 1/2 ripple plate, the described polarizing beam splitter angle that tilts is arranged with parallel mode and is formed, and described 1/2 ripple plate is arranged in wherein between two described polarizing beam splitters in one mode at interval.
3, polarisation according to claim 2 reclaims illuminator, it is characterized in that this polarizing beam splitter has multicoating.
4, polarisation according to claim 2 reclaims illuminator, it is characterized in that this angle is 45 °.
5, polarisation according to claim 1 reclaims illuminator, it is characterized in that this light source is an xenon lamp.
6, polarisation according to claim 1 reclaims illuminator, it is characterized in that this light source is a Halogen lamp LED.
7, polarisation according to claim 1 reclaims illuminator, it is characterized in that this light source is a high-pressure sodium lamp.
8, polarisation according to claim 1 reclaims illuminator, it is characterized in that this light source is a metal halide lamp.
9, polarisation according to claim 1 reclaims illuminator, it is characterized in that this light source is a light emitting diode.
10, polarisation according to claim 1 reclaims illuminator, it is characterized in that, this supplementary lens group comprises the above lens of a slice, and should the postposition lens combination comprise the above lens of a slice.
11, polarisation according to claim 10 reclaims illuminator, it is characterized in that this supplementary lens and this postposition lens are all a non-globe lens.
12, polarisation according to claim 10 reclaims illuminator, it is characterized in that this supplementary lens is a non-globe lens, and should comprise two globe lenss by the postposition lens.
13, polarisation according to claim 10 reclaims illuminator, it is characterized in that this supplementary lens comprises two globe lenss, and should the postposition lens be a non-globe lens.
14, polarisation according to claim 10 reclaims illuminator, it is characterized in that this supplementary lens and this postposition lens all comprise two globe lenss.
15, polarisation according to claim 1 reclaims illuminator, it is characterized in that the xsect of this column optical channel pipe is square.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100064349A CN100570474C (en) | 2004-03-04 | 2004-03-04 | Polarisation reclaims illuminator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100064349A CN100570474C (en) | 2004-03-04 | 2004-03-04 | Polarisation reclaims illuminator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1664694A true CN1664694A (en) | 2005-09-07 |
| CN100570474C CN100570474C (en) | 2009-12-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100064349A Expired - Fee Related CN100570474C (en) | 2004-03-04 | 2004-03-04 | Polarisation reclaims illuminator |
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| Country | Link |
|---|---|
| CN (1) | CN100570474C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101592853B (en) * | 2006-02-20 | 2011-12-21 | 精工爱普生株式会社 | Projector |
-
2004
- 2004-03-04 CN CNB2004100064349A patent/CN100570474C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101592853B (en) * | 2006-02-20 | 2011-12-21 | 精工爱普生株式会社 | Projector |
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| Publication number | Publication date |
|---|---|
| CN100570474C (en) | 2009-12-16 |
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