CN201589896U - Polarized light reuse device capable of improving projection brightness of projection machine - Google Patents
Polarized light reuse device capable of improving projection brightness of projection machine Download PDFInfo
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- CN201589896U CN201589896U CN2010200010481U CN201020001048U CN201589896U CN 201589896 U CN201589896 U CN 201589896U CN 2010200010481 U CN2010200010481 U CN 2010200010481U CN 201020001048 U CN201020001048 U CN 201020001048U CN 201589896 U CN201589896 U CN 201589896U
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Abstract
The utility model provides a polarized light reuse device which comprises a polarized light separating element and two modulated polarized light phase conversion elements, wherein the polarized light separating element comprises a light separating surface capable of transmitting P polarized light and reflecting S polarized light; and the modulated polarized light phase conversion elements are positioned on two light-emitting surfaces of the polarized light separating element respectively, and can reflect the polarized light emitted from the polarized light separating element back to the light separating surface of the polarized light separating element according to demands, and the vibration direction of the obtained reflected polarized light is perpendicular to the polarization direction of the incoming polarized light. The utility model further provides a projector adopting the polarized light reuse device. The polarized light reuse device can effectively improve the projection brightness of an LCoS (Liquid Crystal on Silicon) micro-projection machine and has the advantages of high conversion efficiency, simple structure and simple manufacturing technique.
Description
Technical field
The utility model belongs to liquid crystal on silicon LCoS (liquid-crystal on silicon) little projection display technique field, particularly relates to a kind of polarized light reuse device that improves the brightness of liquid crystal on silicon projector
Background technology
In recent years, shadow casting technique especially liquid crystal on silicon (LCoS) projection display technique develops extremely rapidly because of it has high resolving power, high definition, giant-screen, advantage such as portable, becomes a kind of extremely welcome Projection Display mode.Be widely used in multimedia teaching, home theater, meeting demonstration, even certain application is all arranged in military commanding.Because crystal projection must could realize normal projecting function under polarizing light irradiation.Produce polarized light, method commonly used is exactly to add polaroid in the light path of display, and the polarized light of certain direction of vibration in the natural light can be passed through, and the polarized light of another direction then is polarized sheet and absorbs.Like this, for a light source, have only the luminous energy of half to obtain utilizing.Proposed the reusable notion in polarized light conversion back for the utilization factor that improves light, employed optics is called polarization conversion system PCS (Polarization conversion system).Its principle of work is that the polarization direction of that part of polarized light that can not use by some devices is converted into its vertical direction, then this a part of light can be applied again in Projection Display, this can significantly improve the efficient of ray machine undoubtedly, thereby improves the brightness of Projection Display.In the little projection display system of LCoS, polarization conversion system (PCS) is one of very important original paper, and its performance is to the efficiency of light energy utilization of optical projection system, and display brightness has great influence.
Existing polarization conversion system, as shown in Figure 1, by a colimated light system, a polarized light piece-rate system and a wave plate are formed.Because traditional polarized light piece-rate system (PBS) is when separating polarized light, often the different direction of the mutually perpendicular polarized light directive in polarization direction, then, on the linearly polarized light light path of needs conversion polarization direction, add half-wave plate, utilize catoptron that this part polarized light of having changed the polarization direction is directed to and the identical direction of propagation of other a part of linearly polarized light again, inevitable so feasible facula area through light after the polarization increases and is twice, thereby the optical extend of light beam is doubled, because the transmission of luminous energy is by the parts decision that has minimum optical extend in the optics in the system in optical system, light beam greater than the parts optical extend can not effectively be transmitted by optics, when therefore such system is used in big projector, because the optical extend value of whole optical system is bigger, the facula area that system allowed is big, can obtain satisfied result.But when the volume that reduces projector, it makes when can become handheld device, owing to will use the camera lens of less LCD micro-display of size and smaller aperture due, make the optical extend of system be limited by little display and optics, when using traditional polarization conversion system, the area that effectively utilizes of light beam reduces, and the efficient of whole optical system can not effectively improve, and also the phase strain is big for the volume of simultaneity factor.Therefore, want to improve the optical efficiency in the little projector of liquid crystal on silicon, the optical extend that the polarized light conversion device that adds in optical system will satisfy maintenance light beam in the transfer process of polarized light is constant substantially, and the volume of system is as far as possible little.Therefore be necessary to realize that a kind of novel optical extend that does not improve light beam improves the method for liquid crystal micro projector.
Little owing to the led light source volume, efficient is high, the life-span is long and heating is used to make battery-powered portable minisize projector with respect to the ultrahigh pressure mercury lamp (UHP) of present use is low.Handling characteristics in conjunction with the design objective and the minitype projection machine of projector, to have during with the LED illuminator following to projecting the luminous flux requirement on the projection screen at the design micro projector, promptly in the projector that the individual uses, the brightness that projects on the projection screen will reach more than 10 lumens.But because led light source is a kind of light source of surface launching, its optical extend (Etendue) efficient is that the lumen value of per unit optical extend also is not very high, and minitype projection machine is to the extremely strict requirement that how much has of volume size, power consumption, have only by illumination reasonable in design and projection system architecture, could satisfy the requirement of the lumen brightness of the portable projector light output that declines.
Single present area is that the general efficient of 1x1 millimeter White LED can reach every watt tens to 100 lumen.When the power of LED can only provide brightness less than 200 lumens for 2 watt-hours, because the LCoS display is work light with the polarized light, add the absorption of optics in the projection optical-mechanical system and the losses such as reflection on surface, the optical efficiency of general projector has only 3-4%, so just need to improve the operating power of LED, increase the quantity of LED or the optical efficiency of raising optical-mechanical system.The operating power that improves LED will strengthen the working current of LED, and this can shorten the serviceable life of LED greatly.
Increasing the LED number can increase the luminous flux of projection, but has also increased the optical extend of light source simultaneously.In present optical projection system, the optical extend of system is by the decision of optical extend minimum in the system zero parts, these parts are generally photomodulator (LCoS micro-display) in micro-projector, if the optical extend of light source is greater than the minimum optical extend of system unit, at this moment the luminous flux of Zeng Jiaing can not be utilized by system and lose, and can not effectively improve light output.
In order on the basis of not improving the LED operating power, to improve the output brightness of projection ray machine, using maximum methods is to utilize the polarized light switch technology that half polarized light of wasting in the system is partly utilized, existing polarized light switch technology (as Fig. 1), the natural light that sends by light source, become approximately parallel rayed on the polarizing-splitting prism PBS of back (Polarization Beam Splitter) array through behind the colimated light system, be decomposed into direction of vibration orthogonal linearly polarized light s light and p light by PBS.P light component wherein sees through the PBS film, and the s light component is entered adjacent area by the reflection of PBS film and penetrates prism; Post half-wave plate at its corresponding regional transmission, make S light polarization direction half-twist, make its direction of vibration consistent, thereby obtain P line polarisation with P light.This conversion equipment makes the area that sees through light double when obtaining the polarized light of polarization direction unanimity.Its result, the optical extend (Etendue) of whole optical system is doubled, when using less than the liquid crystal display device of beam area as the photomodulator of projection, the light beam outside the device effective coverage can not be utilized, and has a strong impact on the optical efficiency of optical projection system.And, paste half-wave plate in corresponding S optical transmission zone, make will add even light parts that make that whole light beam is even, this can have weakening of part to light intensity undoubtedly in the emerging beam position.
Summary of the invention
For addressing the above problem, the purpose of this utility model is to provide a kind of novel polarized light reuse device, and it is simple that this device has technology, polarized light conversion ratio height, advantages such as maintenance system optical extend is constant can effectively improve the projection brightness of liquid crystal on silicon micro-projector.Another purpose of the present utility model provides a kind of novel projector, and it is simple in structure, and the projection brightness height is easy to carry, and cooperates the appropriate signals source can realize that 3 D stereo shows.
In order to realize described purpose, polarized light reuse device of the present utility model comprises:
A polarization separating element, described polarization separating element comprises a light splitting surface, described light splitting surface transmissive P polarized light, and can reflect the S polarized light; With
But two modulated polarized light position phase inversion elements, lay respectively on two light directions of described polarization separating element, but the polarized light that described modulated polarized light position phase inversion element can will come out from polarization separating element is with the side of coming out with it light splitting surface of reflected back polarization separating element in the opposite direction, and the direction of vibration of the reflect polarized light that obtains is vertical with the polarization direction of incident polarized light.
When incident light is injected in the polarization separating element, its light splitting surface is to the complete obiteration of P polarization reflection of light, do not produce reflection, penetrate from a light direction transmission of polarization separating element, the S polarized light since the reflex of light splitting surface penetrate by the another one light direction reflection of polarization separating element, thereby reach the purpose that polarized light separates.
Described polarization separating element comprises that is advanced a light direction, is used to receive the light that is input to polarization separating element from the external world; Other three directions are light direction.
Preferably, described polarization separating element is traditional polarized light beam splitting prism.Preferred, described polarized light beam splitting prism is selected from following group: McNall (S.MacNeille) prism, line grating prism, reflective polarizer.
Preferably, but described modulated polarized light position phase inversion element is the LCoS panel.The LCoS panel is placed on two light directions of polarization separating element, on the one hand, whole optical projection system is played the effect of micro-display, on the other hand, principle of work according to LCoS, the polarization direction of incident polarized light can become the polarized light vertical with former polarization direction after reflecting through the LCoS panel.
Preferably, but described modulated polarized light position phase inversion element and the setting at 45 of described light splitting surface.
According on the other hand of the present utility model, the application also provides a kind of projector, comprises light source, aforesaid polarized light reuse device and projection lens, wherein after the light process polarized light reuse device separation conversion adjustment that light source sends, before entering projection lens, mix, for use in imaging.Preferably, described projector also comprises colimated light system, so that the light of described light source enters the polarized light reuse device after collimating through colimated light system again.Preferred, light is to enter the polarization separating element of polarized light reuse device with light splitting surface direction at 45.
Preferably, described light source is a led light source.Preferred, described led light source is white light source or red, blue, green three primary colors LED light source.
Preferably, described led light source is red, blue, green three primary colors LED light source, and described projector also comprises and photosystem, is positioned at before the polarization separating element plane of incidence, is used for red, blue, green three coloured light are combined into white light.Described and photosystem for example is the x prism.
The application's projector also can comprise and is used to adjust the shape of light beam and other opticses and/or the mechanical part of position.These are used to adjust the shape of light beam and the optics and/or the mechanical part of position, know to those skilled in the art, and those skilled in the art can select for use suitable components to be used for the application's projector as required from prior art.Describedly be used to adjust the shape of light beam and other opticses and/or the mechanical part of position for example is mechanical guide rail, piezoelectric ceramics etc.
Polarized light reuse device of the present utility model had both been finished reusing of polarized light, had kept the constant of optical projection system light expansion flux again, had improved the projection brightness of projector greatly.Thereby the brightness of projector provided by the utility model improves.
But when using two LCoS panels as modulated polarized light position phase inversion element, this LCoS panel can also be as the effect of micro-display, i.e. the image of projection obtains showing on panel.
Compared with prior art, the utility model has omitted the process that the accurate contraposition of wave plate is pasted, and greatly reduces technology difficulty and manufacturing cost.
Projector of the present utility model is compared with projector of the prior art, and is simple in structure, low cost of manufacture, and system bulk can be done forr a short time, is more convenient for carrying.
Description of drawings
Fig. 1 is a prior art polarized light switch technology synoptic diagram;
Fig. 2 is the projector's principle schematic according to an embodiment of the invention.
Embodiment
Below preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the utility model, and be not used in qualification the utility model.
As shown in Figure 2, a light splitting surface 6 is arranged in the polarization separating element 2, but modulated polarized light position phase inversion element 3 and 4 is orthogonal, and with light splitting surface setting at 45.By the light (P+S) that light source 1 sends, enter polarization separating element 2 after, on the light splitting surface 6 of polarization separating element 2, be divided into the polarization direction vertical two the bundle polarized lights (P polarized light and S polarized light), wherein:
(1) the P polarized light is from light splitting surface 6 transmissions, but directly enter modulated polarized light position phase inversion element 4, but 4 couples of incident P of modulated polarized light position phase inversion element polarized light is modulated reflection, but the feasible polarized light polarization direction half-twist that from modulated polarized light position phase inversion element 4, reflects, become the S polarized light, enter polarization separating element 2 once more, on the light splitting surface 6 of polarization separating element 2, reflect, propagate to projector lens 5 directions;
(2) the S polarized light reflects on the light splitting surface 6 of polarization separating element 2, but enter modulated polarized light position phase inversion element 3, equally, but 3 couples of incident S of modulated polarized light position phase inversion element light is modulated reflection, but make from the polarized light polarization direction half-twist that modulated polarized light position phase inversion element 3 reflects, become the P polarized light, and enter polarization separating element 2 once more, by the light splitting surface 6 of polarization separating element 2, propagate to projector lens 5 directions.
The S polarized light and the P polarized light that spread out of from polarization separating element mix before entering projection lens, go out high brightness, the image of high-resolution by adjustment means projections on projection screen such as mechanical contraposition or Flame Image Process.
Embodiment 1
Adopted scheme as shown in Figure 2 in the present embodiment, wherein:
Light source 1 is a led light source, and its operating power is 1W, 1 square millimeter of area;
Polarization separating element 2 is a polarization beam splitter prism, and its length and width are respectively 10mm, 8mm;
But modulated polarized light position phase inversion element 3 and 4 is liquid crystal on silicon (LCoS), and its length and width are 9mm, 8mm;
Projection lens 5 is f2.4
But when having only a modulated polarized light position phase inversion element, when promptly having only a liquid crystal on silicon (LCoS) display, the output brightness of projection lens is 3.8 lumens, but when the phase inversion element of two modulated polarized light positions of use, projection lens is output as 6.2 lumens.
Embodiment 2
Adopted scheme as shown in Figure 2 in the present embodiment, wherein:
Light source 1 is a led light source, and its operating power is 1W, 1 square millimeter of area;
Polarization separating element 2 is a polarization beam splitter prism, and its length and width are respectively 8mm, 6mm;
But modulated polarized light position phase inversion element 3 and 4 is liquid crystal on silicon (LCoS), and its length and width are 7mm, 5.5mm;
Projection lens 5 is f2.4
But when having only a modulated polarized light position phase inversion element, when promptly having only a liquid crystal on silicon (LCoS) display, the output brightness of projection lens is 3.3 lumens, but when the phase inversion element of two modulated polarized light positions of use, projection lens is output as 5.3 lumens.
It should be noted that at last: the above only is the preferred embodiments of the present invention, be not limited to the present invention, although the present invention is had been described in detail with reference to previous embodiment, for a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. polarized light reuse device comprises:
A polarization separating element, described polarization separating element comprises a light splitting surface, described light splitting surface transmissive P polarized light, and can reflect the S polarized light; With
But two modulated polarized light position phase inversion elements, lay respectively on two light directions of described polarization separating element, but described modulated polarized light position phase inversion element can be modulated and with the side of coming out with it light splitting surface of reflected back polarization separating element in the opposite direction the polarized light that comes out from polarization separating element, and the direction of vibration of the reflect polarized light that obtains is vertical with the polarization direction of incident polarized light.
2. polarized light reuse device according to claim 1, wherein said polarization separating element are the polarized light beam splitting prism.
3. polarized light reuse device according to claim 2, described polarized light beam splitting prism is selected from down group: McNall prism, line grating prism, reflective polarizer.
4. polarized light reuse device according to claim 1 and 2, but described modulated polarized light position phase inversion element is a silica-based liquid crystal panel.
5. polarized light reuse device according to claim 1 and 2, but wherein said modulated polarized light position phase inversion element and the setting at 45 of described light splitting surface.
6. projector comprises light source, as arbitrary described polarized light reuse device and projection lens among the claim 1-5, after wherein the light that sends of light source separates conversion and adjusts through the polarized light reuse device, mixes before entering projection lens, for use in imaging.
7. projector according to claim 6 is characterized in that: described projector also comprises colimated light system, so that the light of described light source enters the polarized light reuse device after collimating through colimated light system again.
8. projector according to claim 7 is characterized in that: the light of described light source through colimated light system collimation back to enter the polarization separating element of described polarized light reuse device with light splitting surface direction at 45.
9. according to arbitrary described projector among the claim 6-8, wherein said light source is red, blue, green three primary colors LED light source, and described projector also comprises and photosystem, described and photosystem is arranged at before the polarization separating element plane of incidence, is used for red, blue, green three coloured light are combined into white light.
10. projector according to claim 9, wherein said and photosystem is the x prism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010200010481U CN201589896U (en) | 2010-01-18 | 2010-01-18 | Polarized light reuse device capable of improving projection brightness of projection machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010200010481U CN201589896U (en) | 2010-01-18 | 2010-01-18 | Polarized light reuse device capable of improving projection brightness of projection machine |
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| CN201589896U true CN201589896U (en) | 2010-09-22 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445764A (en) * | 2010-10-12 | 2012-05-09 | 亚洲光学股份有限公司 | Three-color light synthesis device |
| CN103293650A (en) * | 2013-05-24 | 2013-09-11 | 京东方科技集团股份有限公司 | Light conversion device, backlight module and display device |
| CN103852897A (en) * | 2014-03-20 | 2014-06-11 | 浙江晶景光电有限公司 | Micro optical engine system based on reuse of polarized light |
| CN108153092A (en) * | 2018-01-03 | 2018-06-12 | 京东方科技集团股份有限公司 | Reflection type optical modulation device, projecting apparatus and AR/VR displays |
| WO2021238891A1 (en) * | 2020-05-25 | 2021-12-02 | 深圳光峰科技股份有限公司 | Prism assembly, light-emitting device, and projection system |
-
2010
- 2010-01-18 CN CN2010200010481U patent/CN201589896U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445764A (en) * | 2010-10-12 | 2012-05-09 | 亚洲光学股份有限公司 | Three-color light synthesis device |
| CN103293650A (en) * | 2013-05-24 | 2013-09-11 | 京东方科技集团股份有限公司 | Light conversion device, backlight module and display device |
| CN103293650B (en) * | 2013-05-24 | 2016-06-15 | 京东方科技集团股份有限公司 | Light conversion equipment, backlight module and display unit |
| CN103852897A (en) * | 2014-03-20 | 2014-06-11 | 浙江晶景光电有限公司 | Micro optical engine system based on reuse of polarized light |
| CN108153092A (en) * | 2018-01-03 | 2018-06-12 | 京东方科技集团股份有限公司 | Reflection type optical modulation device, projecting apparatus and AR/VR displays |
| WO2021238891A1 (en) * | 2020-05-25 | 2021-12-02 | 深圳光峰科技股份有限公司 | Prism assembly, light-emitting device, and projection system |
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Legal Events
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| TR01 | Transfer of patent right |
Effective date of registration: 20170405 Address after: Hongkong Wan Chai Road No. 66 notice China Pico building 18 floor Patentee after: Vision technology (Hongkong) Co., Ltd. Address before: Hongkong Wan Chai Road No. 66 notice China Pico building 18 floor Patentee before: Iview Ltd. |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100922 Termination date: 20190118 |
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| CF01 | Termination of patent right due to non-payment of annual fee |