CN101303454A - LED projection machine optical system - Google Patents
LED projection machine optical system Download PDFInfo
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- CN101303454A CN101303454A CNA200810071273XA CN200810071273A CN101303454A CN 101303454 A CN101303454 A CN 101303454A CN A200810071273X A CNA200810071273X A CN A200810071273XA CN 200810071273 A CN200810071273 A CN 200810071273A CN 101303454 A CN101303454 A CN 101303454A
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Abstract
The invention discloses an optical system of a LED projector. The optical system of the invention comprises a LED light source, a light pipe or a reflective cup, a focusing lens, a projection chip and a projector lens and is characterized in that two polarizing beam splitters are arranged between the focusing lens and the projection chip; one fourth wave plate is arranged at the output terminal of a second polarizing beam splitter along the direction opposite to the projection chip and a total reflection film is plated on the surface of the one fourth wave plate far away from the output terminal of the polarizing beam splitter. By the technical proposal and utilizing the beam splitting action to two polarizing-direction lights by the two polarizing beam splitters as well as the one fourth wave plate, the light emitted by the light source is fully irradiated onto the projection chip by adjustment to modulate an image and then the image is projected by the projection lens, thus improving the projection brightness of the projector.
Description
Technical field
The present invention relates to field of projector, relate generally to the LED projection machine optical system of a kind of LED as light source.
Background technology
Over the past two years, adopt LED rapid as the technical development of light source of projector, projector is tending towards miniaturization, is easy to carry, and life has brought many facilities to people's work, and is popular to people deeply.Under such situation, manufacturer of many projectors all pays much attention to the exploitation of portable translucent machine, fall over each other and produce the portable projection machine of LED that adopt as light source, use DLP (Digital Light Processing is wherein arranged, digital light is handled) the projection chip, use LCD (LiquidCrystal Display is also arranged, liquid crystal display) projection chip, use LcoS (Liquid crystal on silicon in addition, reflective liquid crystal), the common feature of these projectors is exactly that volume is small and exquisite, and use is easy to carry.
LED is the abbreviation of English Light Emitting Diode, i.e. light emitting diode, and this technology just begins a long time ago to be applied in and shows and lighting field.Its core parts are electroluminescent semiconductor wafers, and after its two ends added forward voltage, semiconductor wafer can emit beam.The principle of luminosity of LED is different from traditional fluorescent light and incandescent lamp etc., and its thermal value is lower, so serviceable life is very long, generally can reach more than several ten thousand hours.
Adopting LED to have life-span long (needing hardly more to change the bulb), low in energy consumption, significant advantage such as volume is little and cost is low as the projector of light source, is one of emphasis direction of following projector development.But still there are some problems in LED projector at present, and is also lower such as the brightness of projected image, can't be applied in the relatively large commerce and the application of education.
In above-mentioned three kinds of projection chips mentioning, DLP projection chip is a polarization irrelevant, and LCD is that polarization is relevant with LCoS projection chip.When using LCD and LCoS projection chip technology, the light that has only the polarization direction corresponding with LCD and LCoS projection chip, just can be used to projection, promptly the light by the natural polarization state that led light source sent has only half to be utilized, and must cause the utilization factor of light source to descend significantly like this.
Summary of the invention
The object of the invention provided a kind of simple in structure, volume is less, and the LED projection machine optical system that the brightness of projected image improves, this system can be converted into the natural polarized light that LED sent the light of the linear polarization state that meets LCoS or LCD projection chip, improves the utilization factor of luminous energy and the brightness of projection.
The present invention is by the following technical solutions: projection machine optical system comprises led light source, photoconductive tube or reflector, condenser lens, projection chip and projection lens, two polarization beam apparatus wherein are set between condenser lens and projection chip, and at the output terminal of second polarization beam apparatus, be provided with quarter-wave plate with projection chip reverse direction, quarter-wave plate is away from plating total reflection film on the face of the output terminal of polarization beam apparatus.
Two above-mentioned polarization beam apparatus are made of three prisms, be coated with spectro-film on the joint face of first prism and second prism, to one of them polarization direction component transmission, to another polarization direction component reflection, be coated with identical spectro-film on the joint face of the 3rd prism and first prism, to one of them polarization direction component transmission, to another polarization direction component reflection, the joint face of three prisms and direction of light shape angle at 45.
One is independently placed or composed to three above-mentioned prisms.
Above-mentioned quarter-wave plate is independently placed or is composed one with first prism.
Above-mentioned two polarization beam apparatus or constitute by two wire grid polarization beamsplitters, the light transmission that the polarization direction is parallel to the wiregrating direction, the light of polarization direction perpendicular to the wiregrating direction is reflected, first wire grid polarization beamsplitter and direction of light shape angle at 45, second wire grid polarization beamsplitter and first wire grid polarization beamsplitter form 90 °.
Above-mentioned two polarization beam apparatus or constitute by the optical element that two parallel plates that are coated with polarization beam splitter or polarization spectro-film etc. have an identical function.
Above-mentioned projection chip adopts LCD or LCoS projection chip.
When above-mentioned projection chip adopts LCoS projection chip, the light-emitting face of second prism and first prism and the 3rd face that prism is connected are on same, and be connected with the 3rd prism, be coated with identical spectro-film on the joint face, to one of them polarization direction component transmission, to another polarization direction component reflection.
When above-mentioned projection chip adopted LCoS projection chip, an end of first wire grid polarization beamsplitter was connected with the intermediate point of second wire grid polarization beamsplitter.
When the light of above-mentioned light source outgoing and LCoS projection chip out of plumb, adopt dioptric element to be adjusted to vertically.
Above-mentioned led light source comprises the chip of emission RGB color of light more than three kinds, the shaping and mix the back ejaculation in photoconductive tube or reflector of three coloured light.
In the above-mentioned led light source, color of light adopts dichroic mirror, dioptric element with versicolor combiner respectively by after photoconductive tube or reflector shaping and mixing more than three kinds.
The present invention adopts above technical scheme, used LED as light source, and adopt LCoS or LCD projection chip technology, utilize beam splitting effect and the quarter-wave plate of two polarization beam apparatus to two polarization direction light, the whole adjustment of light that light source is sent shines on the projection chip, after being modulated into image, go out by projection lens projects again.Thereby improved the brightness of projector's projection.
Description of drawings
Now in conjunction with the accompanying drawings the present invention is done further auspicious stating:
Fig. 1 is the structural representation of projection machine optical system embodiment one of the present invention;
Fig. 2 is the structural representation of projection machine optical system embodiment two of the present invention;
Fig. 3 is the structural representation of projection machine optical system embodiment three of the present invention;
Fig. 4 is the structural representation of projection machine optical system embodiment four of the present invention;
Fig. 5 is the structural representation of projection machine optical system embodiment five of the present invention;
Fig. 6 is the structural representation of projection machine optical system embodiment six of the present invention
Fig. 7 is the structural representation of projection machine optical system embodiment seven of the present invention.
Embodiment
See also shown in Fig. 1 or 2, the present invention includes light source 111, photoconductive tube or reflector 112, condenser lens 113, projection chip 118 and projection lens 119, two polarization beam apparatus 114,115 wherein are set between condenser lens 113 and projection chip 118, and at the output terminal of second polarization beam apparatus 114,115, be provided with quarter-wave plate 117 with projection chip 118 reverse directions, quarter-wave plate 117 is away from plating total reflection film M on the face of the output terminal of polarization beam apparatus 115.Projection chip 118 adopts LCoS projection chip 1181, two polarization beam apparatus 114,115 are made of three prisms, be coated with spectro-film on the joint face of first prism 121 and second prism 122, to one of them polarization direction component transmission, to another polarization direction component reflection, constitute polarization beam apparatus 114, be coated with identical spectro-film on the joint face of the 3rd prism 121 and first prism 123, the light-emitting face of second prism 122 and first prism 121 and the 3rd face that prism 123 is connected are on same, and be connected with the 3rd prism 123, plating also has identical spectro-film on the joint face, to one of them polarization direction component transmission, to another polarization direction component reflection, spectro-film on two joint faces constitutes polarization beam apparatus 115, three prisms 121,122,123 joint face and direction of light shape angle at 45, three prisms 121,122,123 can independently place, also can compose one, quarter-wave plate 117 is independently placed or is composed one with first prism 114.As shown in Figure 2, volume for reduction system, can between lens 113 and first prism 114, add a dioptric element 116, has the optical element that changes the light direction effect such as reflector plate or reflecting prism etc., light path is bent, to reduce the redundant space in the optical system, therefore when the light of light source 1 outgoing and LCoS projection chip 1181 out of plumb, all can adopt dioptric element 116 to be adjusted to vertically.
Above-mentioned projector system, adopt led light source 111, the LED that can comprise emission RGB chip of different colours light more than three kinds or three kinds, the light that led light source 111 is sent has the nature polarization state, has the very big angle of divergence simultaneously, utilize photoconductive tube or reflector 112, the ray-collecting that led light source 111 is sent, and by repeatedly reflection, make the three kinds of blend of colors of RGB in the light beam even, photoconductive tube or reflector 112 also can be used for dwindling the angle of divergence of the light beam that led light source sends.Condenser lens 113 is located at the output terminal of photoconductive tube or reflector 112, dwindles the angle of divergence of light beam, and the redgreenblue in the light beam is mixed.Through shaping and mix after light beam incident or incide first prism 121 after reflection, be divided into two-beam by polarization beam apparatus 114, wherein P polarization direction component (is designated hereinafter simply as: P light) will enter second prism 122 by polarization beam apparatus 114, ejaculation enters LcoS projection chip 1181 or enter LcoS projection chip 1181 again behind the 3rd prism 123, and S polarization direction component (is designated hereinafter simply as: S light) will be polarized still propagation in first prism 121 of beam splitter 114 reflections, to polarization beam apparatus 115, output once more is reflected, enter quarter-wave plate 117 through first prism 121, after S light passes quarter-wave plate 117, on total reflection film M, be reflected, again by quarter-wave plate 117, because the bit phase delay effect of quarter-wave plate, S light through twice by after the delayed-action of quarter-wave plate 117, emergent light has just become P light, P light is again by first prism 121, through polarization beam apparatus 115, after entering the 3rd prism 123, penetrate on the remittance LcoS projection chip 1181.LcoS projection chip 1181 carries out imaging modulation time to light beam again, also can change the polarization direction of light beam, and therefore the light of outgoing is S light from the LcoS projection chip 1181.When the S light after the modulation incides on the polarization beam apparatus 115 through the 3rd prism 123, incide after being reflected on the projection lens 119, go out by camera lens 119 projections and form image.So, do not match and energy loss on the LCoS chip 118 that causes can be eliminated, can improve the brightness of projection by polarization state.
See also shown in Figure 3 again, led light source 111 of the present invention has adopted three to launch red respectively, green, the led chip 1111 of blue three-color, 1112 and 1113, after red light process photoconductive tube that red LED chip 1112 is sent or reflector 1122 and lens 1132 and are mixed at shapings, reflexed to dichroscope 1161 places by dioptric element 1162, after blue-light LED chip 1113 blue light that sends process photoconductive tube or reflector 1123 and lens 1133 and are mixed at shapings, reflexed to dichroscope 1161 places and red actinic light by dioptric element 1163, after green light process photoconductive tube that green light LED chip 1111 is sent or reflector 1121 and lens 1131 and are mixed at shaping, incide dichroscope 1161 places with red, blue actinic light.Provide light source behind the red, green, blue three look actinic lights, light beam incides in first prism 114, optical system structure thereafter and principle of work and optical system structure and principle of work shown in Figure 1.
See also again shown in Fig. 4 or 5, projection chip 118 of the present invention adopts LCoS projection chip, two polarization beam apparatus 114,115 by two wire grid polarization beamsplitters 124,125 constitute, wire grid polarization beamsplitter 124,125 principle is the light transmission that the polarization direction is parallel to the wiregrating direction, the light of polarization direction perpendicular to the wiregrating direction is reflected, first wire grid polarization beamsplitter 124 and direction of light shape angle at 45, second wire grid polarization beamsplitter 125 forms 90 ° with first wire grid polarization beamsplitter 124, and an end of first wire grid polarization beamsplitter 124 is connected with the intermediate point of second wire grid polarization beamsplitter 125.
As shown in Figure 4, the light of three kinds of colors of led light source 111 RGB that sends has the nature polarization state, utilizes photoconductive tube or reflector 112, makes the three kinds of blend of colors of RGB in the light beam even, the angle of divergence of dwindling light beam.Line focus lens 113 dwindle the angle of divergence of light beam again, redgreenblue in the light beam is mixed after, light beam incides on first wire grid polarization beamsplitter 124, is divided into P light and S light two-beam.By setting the direction of first wire grid polarization beamsplitter 124, can make the S light transmission, and P light is reflected.Behind first wire grid polarization beamsplitter 124 of S light transmission, incide on second wire grid polarization beamsplitter 125, P light also incides on second wire grid polarization beamsplitter 125 after being reflected by first wire grid polarization beamsplitter 124.The direction that can adjust second wiregrating on the wiregrating beam splitter 125 is identical or opposite with the direction of first wire grid polarization beamsplitter 124, when the two direction is identical, can make S light be through second wiregrating beam splitter 125, incide on the LcoS projection chip 1181, and P light by second wiregrating beam splitter 125 reflection after, incide on the quarter-wave plate 117, after P light passes quarter-wave plate 117, on total reflection film M, be reflected, again by quarter-wave plate 117, because the bit phase delay effect of quarter-wave plate, P light through twice by after the delayed-action of quarter-wave plate 117, emergent light has just become S light, S light incides on second wire grid polarization beamsplitter 125, see through second wiregrating beam splitter 125, incident imports on the LcoS projection chip 1181.LcoS projection chip 1181 carries out imaging modulation time to light beam again, also can change the polarization direction of light beam, and therefore the light of outgoing is P light from the LcoS projection chip 1181.P light after the modulation incides after being reflected on the projection lens 119 through second wire grid polarization beamsplitter 125, is gone out by camera lens 119 projections and forms image.As shown in Figure 5, when the direction of the direction of the wiregrating on second wiregrating beam splitter 125 and first wire grid polarization beamsplitter 124 is opposite, the location swap of LcoS projection chip 1181 and projection lens 119.
See also again shown in Fig. 6 or 7, projection chip 118 of the present invention adopts LCD projection chip 1182, and the principle of LCD projection chip 1182 is transmission-types, so projection lens 119 is located at the transmission direction of LCD projection chip 1182.In the above optical system structure, the structure that light enters before the LCD projection chip 1182 can be identical with Fig. 1,2,3,4 or 5, because LCD projection chip 1182 is different with the reflection-type principle of LcoS projection chip 1181, so polarization beam apparatus 115 does not need to extend to the top of polarization beam apparatus 114.
As shown in Figure 6, the light of three kinds of colors of led light source 111 RGB that sends has the nature polarization state, utilizes photoconductive tube or reflector 112, makes the three kinds of blend of colors of RGB in the light beam even, the angle of divergence of dwindling light beam.Line focus lens 113 dwindle the angle of divergence of light beam again, redgreenblue in the light beam is mixed after, light beam incides in first prism 121.First prism 121 links together with second prism 122 and the 3rd prism 123 respectively, all is coated with polarization spectro-film on joint face, constitutes polarization beam apparatus 114,115.When light beam incides in first prism 121, at first can beam split on first polarization beam apparatus 114, after wherein P light will enter second 122 on prism through the interface, incide on the LCD projection chip 1182; And S light will be reflected still in first prism 114, after entering second polarization beam apparatus 115, be reflected again, and incide on the quarter-wave plate 117, behind the total reflection film M reflection on the quarter-wave plate 117, see through quarter-wave plate 117 again.Through twice propagation in quarter-wave plate 117, S light originally will convert P light to, incide in first prism 121, through polarization beam apparatus 115, also incide on the LCD projection chip 1182.Light beam is through the modulation of LCD projection chip 1182, transmits from the other end of LCD projection chip 1182, and incides on the projection lens 119, projects into image by projection lens 119.
As shown in Figure 7, the light of three kinds of colors of led light source 111 RGB that sends has the nature polarization state, utilizes photoconductive tube or reflector 112, makes the three kinds of blend of colors of RGB in the light beam even, the angle of divergence of dwindling light beam.Line focus lens 113 dwindle the angle of divergence of light beam again, after redgreenblue in the light beam is mixed, light beam incides on first wire grid polarization beamsplitter 124, by adjusting the direction of the wiregrating on first wire grid polarization beamsplitter 124, can make the reflection of P light, incide on the LCD projection chip 1182; And make the S transmittance, the S light of transmission incides on second wire grid polarization beamsplitter 125, by adjusting the wiregrating direction of second wire grid polarization beamsplitter 125, S light is reflected on the quarter-wave plate 117, again by behind the total reflection film M reflection on the quarter-wave plate 117, see through quarter-wave plate 117 once more, S light changes P light into, when P light incides on second wire grid polarization beamsplitter 125, can see through second wire grid polarization beamsplitter 125, incide on the LCD projection chip 1182.Light beam, from the other end outgoing of LCD projection chip 1182 and incides on the projection lens 119 through the modulation of LCD projection chip 1182, projects into image by projection lens 119.
Above-mentioned two polarization beam apparatus 114,115 can also be made of the optical element that two parallel plates that are coated with polarization beam splitter or polarization spectro-film etc. have an identical function and replace.
Claims (12)
1, a kind of LED projection machine optical system, comprise led light source, photoconductive tube or reflector, condenser lens, projection chip and projection lens, it is characterized in that: two polarization beam apparatus are set between condenser lens and projection chip, and at the output terminal of second polarization beam apparatus, be provided with quarter-wave plate with projection chip reverse direction, quarter-wave plate is away from plating total reflection film on the face of the output terminal of polarization beam apparatus.
2, a kind of LED projection machine optical system according to claim 1, it is characterized in that: two polarization beam apparatus is made of three prisms, be coated with spectro-film on the joint face of first prism and second prism, to one of them polarization direction component transmission, to another polarization direction component reflection, be coated with identical spectro-film on the joint face of the 3rd prism and first prism, to one of them polarization direction component transmission, to another polarization direction component reflection, the joint face of three prisms and direction of light shape angle at 45.
3, a kind of LED projection machine optical system according to claim 2 is characterized in that: one is independently placed or composed to its three prisms.
4, a kind of LED projection machine optical system according to claim 1 and 2 is characterized in that: its quarter-wave plate is independently placed or is composed one with first prism.
5, a kind of LED projection machine optical system according to claim 1, it is characterized in that: two polarization beam apparatus or constitute by two wire grid polarization beamsplitters, the light transmission that the polarization direction is parallel to the wiregrating direction, the light of polarization direction perpendicular to the wiregrating direction is reflected, first wire grid polarization beamsplitter and direction of light shape angle at 45, second wire grid polarization beamsplitter and first wire grid polarization beamsplitter form 90 °.
6, according to claim 1,2 or 5 described a kind of LED projection machine optical systems, it is characterized in that: two polarization beam apparatus or constitute by the optical element that two parallel plates that are coated with polarization beam splitter or polarization spectro-film etc. have an identical function.
7, a kind of LED projection machine optical system according to claim 1 is characterized in that: its projection chip adopts LCD or LCoS projection chip.
8, according to claim 2 or 7 described a kind of LED projection machine optical systems, it is characterized in that: when the projection chip adopts LCoS projection chip, the light-emitting face of second prism and first prism and the 3rd face that prism is connected are on same, and be connected with the 3rd prism, be coated with identical spectro-film on the joint face, to one of them polarization direction component transmission, to another polarization direction component reflection.
9, according to claim 5 or 7 described a kind of LED projection machine optical systems, it is characterized in that: when the projection chip adopted LCoS projection chip, an end of first wire grid polarization beamsplitter was connected with the intermediate point of second wire grid polarization beamsplitter.
10, a kind of LED projection machine optical system according to claim 1 is characterized in that: when the light of its light source outgoing and LCoS projection chip out of plumb, adopt dioptric element to be adjusted to vertically.
11, a kind of LED projection machine optical system according to claim 1 is characterized in that: its led light source comprises the chip of emission RGB color of light more than three kinds, the shaping and mix the back ejaculation in photoconductive tube or reflector of three coloured light.
12, a kind of LED projection machine optical system according to claim 1, it is characterized in that: in its led light source, color of light adopts dichroic mirror, dioptric element with versicolor combiner respectively by after photoconductive tube or reflector shaping and mixing more than three kinds.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200810071273XA CN101303454A (en) | 2008-06-25 | 2008-06-25 | LED projection machine optical system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200810071273XA CN101303454A (en) | 2008-06-25 | 2008-06-25 | LED projection machine optical system |
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| CN101303454A true CN101303454A (en) | 2008-11-12 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923272A (en) * | 2009-06-12 | 2010-12-22 | 红蝶科技(深圳)有限公司 | Miniature projection optical engine based on three-color light source |
| CN103323958A (en) * | 2013-06-22 | 2013-09-25 | 夏云 | Speckle eliminating device based on cross polarization composition |
| 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 |
| CN106716186A (en) * | 2014-09-24 | 2017-05-24 | 株式会社高永科技 | Optical image detecting apparatus |
| CN107113392A (en) * | 2014-12-31 | 2017-08-29 | 3M创新有限公司 | Compact optical projection system and associated components |
| CN108776390A (en) * | 2018-06-08 | 2018-11-09 | 施轩杰 | A kind of optical presentation system scheme using non-critical Amici prism |
| CN109283774A (en) * | 2018-11-09 | 2019-01-29 | 广景视睿科技（深圳）有限公司 | A kind of projection lens and optical projection system |
| CN109613703A (en) * | 2018-12-17 | 2019-04-12 | 重庆爱奇艺智能科技有限公司 | A kind of display device based on optical path of turning back |
| WO2019080569A1 (en) * | 2017-10-25 | 2019-05-02 | 华为技术有限公司 | Projector, camera module and terminal device |
-
2008
- 2008-06-25 CN CNA200810071273XA patent/CN101303454A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923272A (en) * | 2009-06-12 | 2010-12-22 | 红蝶科技(深圳)有限公司 | Miniature projection optical engine based on three-color light source |
| 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 |
| CN103323958A (en) * | 2013-06-22 | 2013-09-25 | 夏云 | Speckle eliminating device based on cross polarization composition |
| CN106716186A (en) * | 2014-09-24 | 2017-05-24 | 株式会社高永科技 | Optical image detecting apparatus |
| CN107113392A (en) * | 2014-12-31 | 2017-08-29 | 3M创新有限公司 | Compact optical projection system and associated components |
| WO2019080569A1 (en) * | 2017-10-25 | 2019-05-02 | 华为技术有限公司 | Projector, camera module and terminal device |
| CN108776390A (en) * | 2018-06-08 | 2018-11-09 | 施轩杰 | A kind of optical presentation system scheme using non-critical Amici prism |
| CN109283774A (en) * | 2018-11-09 | 2019-01-29 | 广景视睿科技（深圳）有限公司 | A kind of projection lens and optical projection system |
| CN109613703A (en) * | 2018-12-17 | 2019-04-12 | 重庆爱奇艺智能科技有限公司 | A kind of display device based on optical path of turning back |
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Open date: 20081112 |