CN102004321A - Optical structure of LED liquid crystal projector with single polarization converter - Google Patents

Optical structure of LED liquid crystal projector with single polarization converter Download PDF

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Publication number
CN102004321A
CN102004321A CN201010269544XA CN201010269544A CN102004321A CN 102004321 A CN102004321 A CN 102004321A CN 201010269544X A CN201010269544X A CN 201010269544XA CN 201010269544 A CN201010269544 A CN 201010269544A CN 102004321 A CN102004321 A CN 102004321A
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CN
China
Prior art keywords
liquid crystal
light
polarization converter
optical axis
pbs
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Pending
Application number
CN201010269544XA
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Chinese (zh)
Inventor
陆祖康
吴碧珍
田宝龙
倪旭翔
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ZHEJIANG JINCHENG SCI-TECH DEVELOPMENT Co Ltd
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ZHEJIANG JINCHENG SCI-TECH DEVELOPMENT Co Ltd
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Filing date
Publication date
Application filed by ZHEJIANG JINCHENG SCI-TECH DEVELOPMENT Co Ltd filed Critical ZHEJIANG JINCHENG SCI-TECH DEVELOPMENT Co Ltd
Priority to CN201010269544XA priority Critical patent/CN102004321A/en
Priority to PCT/CN2010/077580 priority patent/WO2012024850A1/en
Publication of CN102004321A publication Critical patent/CN102004321A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3167—Modulator illumination systems for polarizing the light beam
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2073—Polarisers in the lamp house

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Liquid Crystal (AREA)
  • Projection Apparatus (AREA)

Abstract

The invention provides an optical structure of an LED liquid crystal projector with a single polarization converter, comprising a lighting optical shaft and an imaging optical shaft which are vertical, wherein an LED, a collimating lens, a single transmission polarization converter, a lens array and a repeater light set are orderly arranged on the lighting optical shaft; an LCOS liquid crystal display, a PBS and a projection lens are orderly located on the imaging optical shaft; or the optical structure of the LED liquid crystal projector with the single polarization converter comprises two lighting optical shafts and an imaging optical shaft; the LED, the collimating lens and the single transmission polarization converter are orderly located on a first lighting optical shaft; the lens array and the repeater light set are orderly arranged on a second lighting optical shaft; the LCOS liquid crystal display, the PBS and the projection lens are orderly located on the imaging optical shaft; the first lighting optical shaft is parallel to the imaging optical shaft; and the first lighting optical shaft and the imaging optical shaft are both vertical to the second lighting optical shaft. The optical structure can convert the polarization light via the single transmission polarization converter or the single reflection polarization converter; and the optical structure is small in volume, high in light efficiency, low in cost and simple in machining and assembling.

Description

Optical texture with LED liquid crystal projector of single polarization converter
Technical field
The present invention relates to the optical texture of LED liquid crystal projector, especially have the optical texture of the LED liquid crystal projector of single polarization converter.
Background technology
Liquid crystal projector is to use photovoltaic very widely, and at present common liquid crystal projector adopts the metal halogen tungsten lamp as light source, though the brightness height, volume is bigger.The inner polarization conversion system (PCS) that adopts usually of this class liquid crystal projector is converted to polarized light with the nonpolarized light of metal halogen tungsten lamp, to improve the efficiency of light energy utilization.PCS generally includes a row's block prism array and a double lens arra.The block prism array is bonded together by n block prism, because nonpolarized light is behind block prism, the outgoing beam diameter will increase to incident beam diameter (n+1)/n doubly, outgoing diameter for not obvious increase light beam, n is bigger usually, such as more than 6, so block prism array processing and manufacturing complexity, the cost height, volume is bigger.Second row's lens arra of double lens arra generally is positioned on the focal plane of first row's lens arra, and first a plurality of light pencil overlapping imagings of cutting apart of row's lens in the infinite distance, are imaged in the liquid crystal display surface by relaying light group, forms evenly and throws light on.Double lens arra another vital role in PCS is to be necessary for the matched environment that the block prism array provides light pencil to cut row, to improve the inclined to one side efficient of commentaries on classics of PCS.Therefore, the design of lens arra with install must with the consideration that combines of block prism array.Owing to will accurately adjust the relative position of two row's lens arras and block prism array in the assembling, therefore waste time and energy, and double lens arra also cause the volume of projector bigger.
Along with applying of led light source, adopt LED also progressively to apply as the liquid crystal projector of light source.If still adopt the polarization conversion system PCS of aforementioned Halogen lamp LED liquid crystal projector in the LED liquid crystal projector, then the volume of projector and cost will be difficult to reduce.In addition, because the light-emitting area of LED is big, be difficult to use ripe PCS technology.Up to now, do not see the product of the microminiature projector that uses polarization conversion technique as yet.Therefore, how polarization conversion technique is migrated in the microminiature LED liquid crystal projector, become the development trend of new technology.
Summary of the invention
The purpose of this invention is to provide a kind of small size, high light efficiency, low cost, processing and assembling simply have the optical texture of the LED liquid crystal projector of single polarization converter.
For reaching above-mentioned purpose, the present invention has following two kinds of technical solutions.
Scheme 1
Optical texture with LED liquid crystal projector of single polarization converter, comprise lighting optical axis and imaging optical axis, on lighting optical axis, place LED successively, collimating mirror, single transmission-type polarization converter, lens arra and relaying light group are placed the LCOS liquid crystal display successively on the imaging optical axis, PBS and projection lens, lighting optical axis is vertical with the imaging optical axis; The nonpolarized light of LED emission is behind the collimating mirror collimation, be incident to single transmission-type polarization converter, convert nonpolarized light to polarized light by single transmission-type polarization converter, and be incident to lens arra, after relaying light group arrives PBS, PBS reflects the liquid crystal display in LCOS with polarized light to light beam by the lens arra shaping.Polarized light is after LCOS liquid crystal display modulation, and change of polarization 90 degree reflex to PBS again, are transmitted to projection lens through PBS, by projection lens with the image projection of LCOS liquid crystal display to projection screen.
Above-mentioned single transmission-type polarization converter can be formed by a right-angle prism and a rhombic prism gummed, on both cemented surfaces, be coated with polarization beam splitter, on the exit facet of right-angle prism, paste 1/2 wave plate, the nonpolarized light of incident all is converted to the S polarized light; Perhaps on the exit facet of rhombic prism, paste 1/2 wave plate, the nonpolarized light of incident all is converted to the P polarized light.
Above-mentioned single transmission-type polarization converter also can be made of the flat board of two 45 degree arranged parallel, and wherein first flat board is polarization spectroscope, and second flat board is total reflective mirror.Vertical 1/2 wave plate of pasting between the end of two flat boards all is converted to the P polarized light with the nonpolarized light of incident; Perhaps first dull and stereotyped terminal above vertical sticking obedient 1/2 wave plate, the nonpolarized light of incident all is converted to the S polarized light.
Scheme 2
Optical texture with LED liquid crystal projector of single polarization converter, comprise two lighting optical axis and an imaging optical axis, on first lighting optical axis, place successively and place LED successively, collimating mirror and single reflection type polarization converter, place lens arra and relaying light group on second lighting optical axis successively, on the imaging optical axis, place the LCOS liquid crystal display successively, PBS and projection lens, first lighting optical axis and imaging optical axis are parallel to each other, and all perpendicular to second lighting optical axis; The nonpolarized light of LED emission is behind the collimating mirror collimation, be incident to single reflection type polarization converter, convert nonpolarized light to polarized light by single reflection type polarization converter, and reflex to lens arra, after relaying light group arrives PBS, PBS reflects the liquid crystal display in LCOS with polarized light to light beam by the lens arra shaping.Polarized light is after LCOS liquid crystal display modulation, and change of polarization 90 degree reflex to PBS again, are transmitted to projection lens through PBS, by projection lens with the image projection of LCOS liquid crystal display to projection screen.
Above-mentioned single reflection type polarization converter can be formed by a right-angle prism and a rhombic prism gummed, on both cemented surfaces, be coated with polarization beam splitter, on the exit facet of rhombic prism, paste 1/2 wave plate, the nonpolarized light of incident all is converted to the S polarized light; Perhaps on the exit facet of right-angle prism, paste 1/2 wave plate, the nonpolarized light of incident all is converted to the P polarized light.
The nonpolarized light that the present invention can send LED all is converted to polarized light, effectively improved the optical energy utilization efficiency and the brightness of projector, and volume is little, and cost is low, and processing and assembling are simple.
Description of drawings
Fig. 1 is the optical texture synoptic diagram of the present invention program 1 the LED liquid crystal projector with single polarization converter.
Fig. 2 is first kind of single transmission-type polarization converter synoptic diagram.
Fig. 3 is second kind of single transmission-type polarization converter synoptic diagram.
Fig. 4 is the third single transmission-type polarization converter synoptic diagram.
Fig. 5 is the 4th a kind of single transmission-type polarization converter synoptic diagram.
Fig. 6 is the optical texture synoptic diagram of the present invention program 2 the LED liquid crystal projector with single polarization converter.
Fig. 7 is first kind of single reflection type polarization converter synoptic diagram.
Fig. 8 is second kind of single reflection type polarization converter synoptic diagram.
Embodiment
With reference to Fig. 1, the optical texture of the LED liquid crystal projector with single polarization converter of scheme 1, comprise lighting optical axis and imaging optical axis, on lighting optical axis, place light source led 101 successively, collimating mirror 102, single transmission-type polarization converter 103, lens arra 104 and relaying light group 105, on the imaging optical axis, place LCOS liquid crystal display 106 successively, PBS (polarizing beam splitter) 107 and projection lens 108, lighting optical axis is vertical with the imaging optical axis; The nonpolarized light of LED 101 emissions is behind collimating mirror 102 collimations, be incident to single transmission-type polarization converter 103, convert nonpolarized light to polarized light by single transmission-type polarization converter 103, and be incident to lens arra 104, after relaying light group 105 arrives PBS107, PBS 107 reflects polarized light in LCOS liquid crystal display 106 to light beam by lens arra 104 shapings.Polarized light is after LCOS liquid crystal display 106 modulation, and change of polarization 90 degree reflex to PBS 107 again, are transmitted to projection lens 108 through PBS 107, by projection lens 108 with the image projection of LCOS liquid crystal display 106 to projection screen 109.
Above-mentioned single transmission-type polarization converter 103 is formed by a right-angle prism 103A and a rhombic prism 103B gummed, on both cemented surfaces, be coated with polarization beam splitter, can be as shown in Figure 2, paste 1/2 wave plate 103C on the exit facet of rhombic prism 103B, the nonpolarized light of incident at this moment all is converted to the P polarized light.Perhaps can be as shown in Figure 3, on the exit facet of right-angle prism 103A, paste 1/2 wave plate 103C, the nonpolarized light of incident all is converted to the S polarized light.
Above-mentioned single transmission-type polarization converter 103 also can be made of the flat board of two 45 degree arranged parallel, and wherein first dull and stereotyped 103D is polarization spectroscope, and second dull and stereotyped 103E is total reflective mirror.As shown in Figure 4, the vertical 1/2 wave plate 103C that pastes between the end of two flat boards all is converted to the P polarized light with the nonpolarized light of incident; Perhaps as shown in Figure 5, vertical sticking obedient 1/2 wave plate 103C above first dull and stereotyped 103D end all is converted to the S polarized light with the nonpolarized light of incident.
With reference to Fig. 6, the optical texture of the LED liquid crystal projector with single polarization converter of scheme 2, comprise two lighting optical axis and an imaging optical axis, on first lighting optical axis, place successively and place light source led 201 successively, collimating mirror 202 and single reflection type polarization converter 203, place lens arra 204 and relaying light group 205 on second lighting optical axis successively, on the imaging optical axis, place LCOS liquid crystal display 206 successively, PBS 207 and projection lens 208, first lighting optical axis and imaging optical axis are parallel to each other, and all perpendicular to second lighting optical axis; The nonpolarized light of LED 201 emissions is behind collimating mirror 202 collimations, be incident to single reflection type polarization converter 203, convert nonpolarized light to polarized light by single reflection type polarization converter 203, and reflex to lens arra 204, after relaying light group 205 arrives PBS 207, PBS 207 reflects polarized light in LCOS liquid crystal display 206 to light beam by lens arra 204 shapings.Polarized light is after LCOS liquid crystal display 206 modulation, and change of polarization 90 degree reflex to PBS 207 again, are transmitted to projection lens 208 through PBS 207, by projection lens 208 with the image projection of LCOS liquid crystal display 206 to projection screen 209.
Above-mentioned single reflection type polarization converter 203 can be formed by a right-angle prism 203A and a rhombic prism 203B gummed, on both cemented surfaces, be coated with polarization beam splitter, as shown in Figure 7, on the exit facet of rhombic prism 203B, paste 1/2 wave plate 203C, the nonpolarized light of incident all is converted to the S polarized light; Perhaps as shown in Figure 8, on the exit facet of right-angle prism 203A, paste 1/2 wave plate 203C, the nonpolarized light of incident all is converted to the P polarized light.

Claims (5)

1. the optical texture that has the LED liquid crystal projector of single polarization converter, it is characterized in that comprising lighting optical axis and imaging optical axis, on lighting optical axis, place LED (101) successively, collimating mirror (102), single transmission-type polarization converter (103), lens arra (104) and relaying light group (105) are placed LCOS liquid crystal display (106) successively on the imaging optical axis, PBS (107) and projection lens (108), lighting optical axis is vertical with the imaging optical axis; The nonpolarized light of LED (101) emission is behind collimating mirror (102) collimation, be incident to single transmission-type polarization converter (103), convert nonpolarized light to polarized light by single transmission-type polarization converter (103), and be incident to lens arra (104), after relaying light group (105) arrives PBS (107), PBS (107) reflects polarized light in LCOS liquid crystal display (106) to light beam by lens arra (104) shaping.Polarized light is after LCOS liquid crystal display (106) modulation, change of polarization 90 degree, reflex to PBS (107) again, be transmitted to projection lens (108) through PBS (107), by projection lens (108) with the image projection of LCOS liquid crystal display (106) to projection screen (109).
2. the optical texture with LED liquid crystal projector of single polarization converter according to claim 1, it is characterized in that single transmission-type polarization converter (103) is formed by a right-angle prism (103A) and a rhombic prism (103B) gummed, on both cemented surfaces, be coated with polarization beam splitter, on the exit facet of right-angle prism (103A), paste 1/2 wave plate (103C), the nonpolarized light of incident all is converted to the S polarized light; Perhaps on the exit facet of rhombic prism (103B), paste 1/2 wave plate (103C), the nonpolarized light of incident all is converted to the P polarized light.
3. the optical texture with LED liquid crystal projector of single polarization converter according to claim 1, it is characterized in that single transmission-type polarization converter (103) is made of the flat board of two 45 degree arranged parallel, wherein first flat board (103D) is polarization spectroscope, and second flat board (103E) is total reflective mirror.Vertical 1/2 wave plate (103C) of pasting between the end of two flat boards all is converted to the P polarized light with the nonpolarized light of incident; Perhaps at vertically sticking obedient 1/2 wave plate (103C) in the terminal top of first flat board (103D), the nonpolarized light of incident all is converted to the S polarized light.
4. the optical texture that has the LED liquid crystal projector of single polarization converter, it is characterized in that comprising two lighting optical axis and an imaging optical axis, on first lighting optical axis, place successively and place LED (201) successively, collimating mirror (202) and single reflection type polarization converter (203), place lens arra (204) and relaying light group (205) on second lighting optical axis successively, on the imaging optical axis, place LCOS liquid crystal display (206) successively, PBS (207) and projection lens (208), first lighting optical axis and imaging optical axis are parallel to each other, and all perpendicular to second lighting optical axis; The nonpolarized light of LED (201) emission is behind collimating mirror (202) collimation, be incident to single reflection type polarization converter (203), convert nonpolarized light to polarized light by single reflection type polarization converter (203), and reflex to lens arra (204), after relaying light group (205) arrives PBS (207), PBS (207) reflects polarized light in LCOS liquid crystal display (206) to light beam by lens arra (204) shaping.Polarized light is after LCOS liquid crystal display (206) modulation, change of polarization 90 degree, reflex to PBS (207) again, be transmitted to projection lens (208) through PBS (207), by projection lens (208) with the image projection of LCOS liquid crystal display (206) to projection screen (209).
5. the optical texture with LED liquid crystal projector of single polarization converter according to claim 4, it is characterized in that single reflection type polarization converter (203) is formed by a right-angle prism (203A) and a rhombic prism (203B) gummed, on both cemented surfaces, be coated with polarization beam splitter, on the exit facet of rhombic prism (203B), paste 1/2 wave plate (203C), the nonpolarized light of incident all is converted to the S polarized light; Perhaps on the exit facet of right-angle prism (203A), paste 1/2 wave plate (203C), the nonpolarized light of incident all is converted to the P polarized light.
CN201010269544XA 2010-08-27 2010-08-27 Optical structure of LED liquid crystal projector with single polarization converter Pending CN102004321A (en)

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CN201010269544XA CN102004321A (en) 2010-08-27 2010-08-27 Optical structure of LED liquid crystal projector with single polarization converter
PCT/CN2010/077580 WO2012024850A1 (en) 2010-08-27 2010-10-08 Optical structure of led liquid crystal projector with single polarization converter

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CN102243376A (en) * 2011-06-16 2011-11-16 中国科学院福建物质结构研究所 High-light-efficiency and high-brightness miniature projection liquid crystal on silicon (LCOS) optical engine
CN102243424A (en) * 2011-06-16 2011-11-16 中国科学院福建物质结构研究所 Miniature projection liquid crystal on silicon (LCOS) optical engine
CN102385224A (en) * 2011-10-31 2012-03-21 苏州佳世达光电有限公司 Projection device
CN106918921A (en) * 2017-04-26 2017-07-04 北京镭创高科光电科技有限公司 A kind of laser display based on fly's-eye lens is polarized shimming apparatus for shaping
CN107045255A (en) * 2017-02-03 2017-08-15 中国电子科技集团公司第五十五研究所 A kind of slim LC projection display LED polarization light sources
CN111158205A (en) * 2019-12-31 2020-05-15 广景视睿科技（深圳）有限公司 Projector and projection system
CN114460799A (en) * 2021-11-05 2022-05-10 杭州中科极光科技有限公司 Laser display light source system and laser display equipment

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CN2549486Y (en) * 2002-06-04 2003-05-07 邵剑心 Small rear projection color display devices
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102243376A (en) * 2011-06-16 2011-11-16 中国科学院福建物质结构研究所 High-light-efficiency and high-brightness miniature projection liquid crystal on silicon (LCOS) optical engine
CN102243424A (en) * 2011-06-16 2011-11-16 中国科学院福建物质结构研究所 Miniature projection liquid crystal on silicon (LCOS) optical engine
CN102385224A (en) * 2011-10-31 2012-03-21 苏州佳世达光电有限公司 Projection device
CN102385224B (en) * 2011-10-31 2013-08-21 苏州佳世达光电有限公司 Projection device
CN107045255A (en) * 2017-02-03 2017-08-15 中国电子科技集团公司第五十五研究所 A kind of slim LC projection display LED polarization light sources
CN106918921A (en) * 2017-04-26 2017-07-04 北京镭创高科光电科技有限公司 A kind of laser display based on fly's-eye lens is polarized shimming apparatus for shaping
CN111158205A (en) * 2019-12-31 2020-05-15 广景视睿科技（深圳）有限公司 Projector and projection system
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CN114460799A (en) * 2021-11-05 2022-05-10 杭州中科极光科技有限公司 Laser display light source system and laser display equipment

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Application publication date: 20110406