CN1254101A - Back type liquid crystal display projection apparatus - Google Patents
Back type liquid crystal display projection apparatus Download PDFInfo
- Publication number
- CN1254101A CN1254101A CN99124452A CN99124452A CN1254101A CN 1254101 A CN1254101 A CN 1254101A CN 99124452 A CN99124452 A CN 99124452A CN 99124452 A CN99124452 A CN 99124452A CN 1254101 A CN1254101 A CN 1254101A
- Authority
- CN
- China
- Prior art keywords
- light
- image
- optical
- projection arrangement
- body formula
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- 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
- G03B21/10—Projectors with built-in or built-on screen
-
- 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
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
- G03B21/006—Projectors using an electronic spatial light modulator but not peculiar thereto using LCD's
-
- 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
- G03B21/142—Adjusting of projection optics
Abstract
A rear-type liquid crystal display (LCD) projection apparatus having a light source, an image source for generating an image, and a projection lens unit for enlarging/projecting image light generated from the image source onto a screen, wherein the projection lens unit includes a first optical lens group in which a plurality of optical lenses are sequentially arranged to focus the image light incident from the image source, for shifting an optical path by bending the optical axis of the image light having passed through the first optical lens group at a predetermined angle, and a second optical lens group for focusing the image light whose optical axis is shifted by the optical path shifting means and enlarging/projecting the focused image light onto the screen.
Description
The present invention relates to a kind of back of the body formula (rear-type) liquid crystal display (LCD) projection arrangement, the image that the LCD device that is used for using as image source produces is presented at screen, the invention particularly relates to a kind of back of the body formula LCD projection arrangement, be used for image amplified and the optical lens configuration that projects the projecting lens unit on the screen lightens its total system and diminishes by improvement.
Projection arrangement such as video projector or projection TV adopts the image processing system such as LCD (LCD) or small size cathode ray tube (CRT) to form image, image is amplified and project on the giant-screen by projecting lens, thereby on screen, show needed image.Owing to it is advantageous that the giant-screen that can be met consumer wants, therefore, its demand is also increasing.
According to the method for amplification/projects images, this optical projection system is divided into preceding formula (front-type) optical projection system and back of the body formula optical projection system basically, and according to the type of image processing system, this system is divided into transmittive projection system and reflective projection system again.
With reference to Fig. 1, it represents traditional back of the body formula LCD projection arrangement, and wherein, the screen 150 of display image is installed in the front surface of casing 100, and catoptron 140 is mounted obliquely within the rear side of casing 100, facing to screen 150.What install in the bottom of casing 100 is projection arrangement, is used for through catoptron 140 image light being projected screen 150, and this projection arrangement comprises: light source 110 is used to send the light that adopts halogen or xenon to produce; LCD device 120 is used to use the light that sends from light source 110 to produce image; And projecting lens unit 130, be used for will amplifying/project screen 150 by the image that LCD device 120 produces through catoptron 140.
In having the tradition back of the body formula LCD projection arrangement of said structure, as shown in Figure 3, the optical lens group L that is arranged in the projecting lens unit 130 has the linear optics configuration.Therefore, the image light that projects from projecting lens unit 130 incides catoptron 140 point-blank.Adopt this optical arrangement, since should regulate the image light that projects from projecting lens unit 130 focus so that its fall on the screen 150 through catoptron 140, therefore, the height of casing depends on the focal length of optical lens group L, and this is an impediment to the light and little optical projection system of realization.
Fig. 2 is the synoptic diagram of another traditional back of the body formula LCD projection arrangement, second catoptron 140 ' be arranged between the projecting lens unit 130 and first catoptron 140 wherein, counterpart equivalence among projecting lens unit 130 and first catoptron 140 and Fig. 1, and the optical axis of the image that projects from projecting lens unit 130 is offset, with to catoptron 140 deflections, thereby regulate the focal length of projecting lens unit 130, make it shorter than situation shown in Figure 1, with reduce casing 100 ' height.
But, as shown in Figure 3, because it also is linear being arranged on this configuration of the optical lens group L in the projecting lens unit 130 of projection arrangement shown in Figure 2, therefore, the optical axis of the image that projects from projecting lens unit 130 is with respect to second catoptron 140 ' form linear.Therefore because projecting lens unit 130 and second catoptron 140 ' between distance be restricted and be greater than a preset distance, casing 100 ' the degree of depth, promptly the width between before it and the back side depends on this distance, and this is an impediment to the light and little optical projection system of realization.
In other words, according to traditional back of the body formula LCD projection arrangement, because the optical arrangement of projecting lens unit, if reduce the casing degree of depth, then it highly increases, and if it highly reduces, then degree of depth increase.Therefore, be difficult to make the projection arrangement miniaturization to be arrived less than preliminary dimension.
In order to address the above problem, the purpose of this invention is to provide a kind of light and little back of the body formula LCD projection arrangement, this device also keeps the giant-screen with the conventional apparatus same size simultaneously, optical axis deflection by projecting lens unit being configured to make image to be reducing the optical projection distance between projecting lens unit and the screen, thereby reduces the space that projection arrangement occupies.
Therefore, in order to realize this purpose, the invention provides a kind of back of the body formula LCD (LCD) projection arrangement, this device has: light source; Image source is used to use the light that sends from light source to produce image; And projecting lens unit, be used for screen is amplified/projected to the image light that produces from image source, wherein this projecting lens unit comprises: first optical lens group, wherein be sequentially set with a plurality of optical lenses, focus on so that make from the image light of image source incident; The light path offset assembly is used for by being offset light path through the optical axis deflection predetermined angular of the image light of first optical lens group; And second optical lens group, be used for the image light of its optical axis by the skew of light path offset assembly focused on, and the image light after will focusing on is amplified/is projected on the screen.
In back of the body formula LCD projection arrangement of the present invention, the light path offset assembly is the light shaft offset prism preferably, it is to constitute like this, promptly, make primary optical axis deflection one angle by the image light of first optical lens group, this angular range is 90 ° to 135 °, thereby be offset, and this light path offset assembly is preferably by making based on the material of optical plastic.
According to the present invention, the light shaft offset prism preferably has and comprises the reflective film that disappears of one deck at least, and it is formed on its light incident and the exit facet, and is preferably in and is formed with the reflective film of being made by Al or Ag on its light reflection surface.In addition, the light shaft offset prism is preferably pentagonal, and its light incident and exit facet are respectively perpendicular to optical axis.
With reference to the detailed description of accompanying drawing to the preferred embodiment of the present invention, it is clearer that above-mentioned purpose of the present invention and advantage will become, in the accompanying drawing:
Fig. 1 is the synoptic diagram of the traditional back of the body formula LCD projection arrangement of expression;
Fig. 2 is the synoptic diagram of another traditional back of the body formula LCD projection arrangement of expression;
Fig. 3 is the synoptic diagram that expression is arranged on the optical lens configuration of the projecting lens unit in traditional projection arrangement shown in Fig. 1 or 2;
Fig. 4 is the synoptic diagram that expression the present invention carries on the back formula LCD projection arrangement;
Fig. 5 is the synoptic diagram that expression is arranged on the optical lens configuration of the projecting lens in the projection arrangement shown in Figure 4; And
Fig. 6 is the apart view that schematically shows the light shaft offset prism that is arranged in the projecting lens unit shown in Figure 5.
With reference to Fig. 4, screen 250 of display image is installed in the front surface of casing 200 on it, and catoptron 240 is mounted obliquely within the rear side of casing 200, and facing to screen 250.What the bottom of casing 200 was provided with is projection arrangement, is used for image light is projected screen 250 through catoptron 240, and this projection arrangement comprises: light source 210 is used to send the light that uses halogen and xenon to produce; LCD device 220 is used to use the light that sends from light source 210 to produce image; And projecting lens unit 230, be used for will amplifying/project screen by the image that LCD device 220 produces through catoptron 240.
As shown in Figure 5, as characteristic of the present invention, projecting lens unit 230 comprises: the first optical lens group L-I, wherein sequentially be provided with a plurality of optical lenses, and focus on so that make from the image light of LCD device 220 incidents; Light shaft offset prism P is used for making the optical axis deflection of the image light that sees through the first optical lens group L-I by with optical axis deflection predetermined angular; And the second optical lens group L-II, wherein sequentially be provided with a plurality of optical lenses, so that its optical axis is focused on by the image light of light shaft offset prism P skew, and this image light is amplified/projected on the screen 250.
The first optical lens group L-I comprises at least one convex lens L1, concavees lens L2 and aplanat L3, so that incident light is focused on.
The second optical lens group L-II comprises at least one convex lens L4, concave-convex lens L5, concavees lens L6 and aplanat L7, and its optical axis is with respect to the light shaft coaxle setting of the first optical lens group L-I.
According to the present invention, light shaft offset prism P is pentagon, so that make light entrance face Pi and light-emitting face Po respectively perpendicular to primary optical axis, so that see through main shaft deflection one angle of the image light of the first optical lens group L-I, this angular range is 90 ° to 135 °.
In addition, light shaft offset prism P preferably adopts based on the material of optical plastic and makes.As shown in the figure, on light entrance face Pi and light-emitting face Po, form the reflective film P1 that disappears that forms by one deck at least respectively, and on light reflection surface Pr, form another reflective film P2 that makes by aluminium (Al) or silver-colored (Ag).
In back of the body formula LCD projection arrangement of the present invention, the image light that is formed by LCD device 220 incides the light entrance face Pi of light shaft offset prism P then by being installed in the first optical lens group L-I in the projecting lens unit 230.Here, because the reflective film P1 that disappears that is formed on the light entrance face Pi has reduced incident image reflection of light rate, therefore, its transmissivity increases.
The primary optical axis of image light that incides light entrance face Pi is by light reflection surface Pr deflection one angle of light shaft offset prism P, and this angular range is 90 to 130 °, thereby makes its light path skew with by the second optical lens group L-II, is transmitted into light-emitting face Po then.Here, owing to be formed on the reflectivity that reflective film P1 on the light-emitting face Po has reduced the image light of emission, therefore, its transmissivity increases.
According to another aspect of the present invention, when the surround lighting incident angle of the image light optical axis that incides light reflection surface Pr satisfies refractive index, i.e. the refractive index of prism material, total reflection condition the time, can not be formed on light reflection surface Pr and go up the reflective film P2 that forms.In addition, the light entrance face Pi of light shaft offset prism P and light-emitting face Po can be bent to and have any curvature.
As mentioned above, its optical routing light shaft offset prism P deflection and the image light that sees through the second optical lens group L-II are exaggerated/project screen 250 then, thereby shown needed image on screen 250 by catoptron 240 reflections.Therefore, because the focal length of projecting lens unit 230 is shortened, so, reduce the projector distance of image light, thereby reduced projecting lens unit 230 occupied space in casing 200.Therefore, whole optical projection system is diminished with light, and make screen keep the same with conventional screen big simultaneously.Similarly, when the size that makes whole optical projection system is identical with the legacy system maintenance, can obtain bigger screen.
As mentioned above, in back of the body formula LCD projection arrangement of the present invention, a kind of projecting lens unit is provided, be constructed so that the optical axis deflection predetermined angular of image light, be offset then reducing the projector distance from the projecting lens unit to the screen, thereby reduce in the whole projection arrangement by the occupied space of projecting lens unit, thereby, total system is lightened with little, and make screen the same with conventional screen big simultaneously.
Claims (8)
1. a back of the body formula (rear-type) liquid crystal display (LCD) projection arrangement has: light source; Image source is used to use the light that sends from light source to produce image; And projecting lens unit, being used for screen is amplified/projected to the image light that produces from image source, wherein said projecting lens unit comprises:
First optical lens group wherein is sequentially set with a plurality of optical lenses, so that focus on from the image light of image source incident;
The light path offset assembly is used for by being offset light path through the optical axis deflection predetermined angular of the image light of first optical lens group; And
Second optical lens group be used for the described image light of its optical axis by the skew of light path offset assembly focused on, and the image light after will focusing on is amplified/is projected on the screen.
2. back of the body formula LCD projection arrangement as claimed in claim 1, wherein said light path offset assembly are to constitute like this,, make primary optical axis deflection one angle of the image light that sees through first optical lens group that is, and this angular range is 90 ° to 135 °, thereby is offset.
3. back of the body formula LCD projection arrangement as claimed in claim 1, wherein said light path offset assembly is the light shaft offset prism.
4. back of the body formula LCD projection arrangement as claimed in claim 3, wherein said light shaft offset prism is to be made by the material based on optical plastic.
5. back of the body formula LCD projection arrangement as claimed in claim 3, wherein said light shaft offset prism have and comprise the reflective film that disappears of one deck at least, and described antireflecting film is formed on its light incident and the exit facet.
6. back of the body formula LCD projection arrangement as claimed in claim 3, wherein said light shaft offset prism has the reflective film of being made by Al (aluminium) or Ag (silver), is formed on its light reflection surface.
7. back of the body formula LCD projection arrangement as claimed in claim 3, wherein said light shaft offset prism is pentagonal, and its light incident and exit facet are respectively perpendicular to optical axis.
8. back of the body formula LCD projection arrangement as claimed in claim 3, the light incident and the exit facet of wherein said light shaft offset prism have arbitrary surface respectively.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980049220A KR100292356B1 (en) | 1998-11-17 | 1998-11-17 | Rear type LCD projector |
| KR49220/1998 | 1998-11-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1254101A true CN1254101A (en) | 2000-05-24 |
Family
ID=19558608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99124452A Pending CN1254101A (en) | 1998-11-17 | 1999-11-17 | Back type liquid crystal display projection apparatus |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2000187274A (en) |
| KR (1) | KR100292356B1 (en) |
| CN (1) | CN1254101A (en) |
| DE (1) | DE19955332A1 (en) |
| GB (1) | GB2343966B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1300617C (en) * | 2003-08-11 | 2007-02-14 | 株式会社日立制作所 | Projector optical unit, projection type image display apparatus, and rear projection type image display apparatus using the said projector optical unit |
| CN100414433C (en) * | 2003-11-28 | 2008-08-27 | 株式会社日立制作所 | Projection optical unit and projection image display apparatus |
| CN103926675A (en) * | 2013-01-14 | 2014-07-16 | 扬明光学股份有限公司 | Image reconstructing camera and projector |
| CN108375865A (en) * | 2018-05-28 | 2018-08-07 | 长沙创荣电子科技有限公司 | Single chip type liquid crystal projector |
| CN109991737A (en) * | 2017-12-29 | 2019-07-09 | 深圳点石创新科技有限公司 | Optical projection system |
| CN115691383A (en) * | 2022-09-27 | 2023-02-03 | 惠科股份有限公司 | Display device and image display method thereof |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020002966A (en) * | 2000-06-30 | 2002-01-10 | 구자홍 | Projection Lens System of Liquid Crystal Display Projector |
| US6634756B1 (en) * | 2002-06-27 | 2003-10-21 | Koninklijke Philips Electronics N.V. | Beam-splitter folded path for rear projection displays |
| JP4694806B2 (en) * | 2004-09-01 | 2011-06-08 | 富士フイルム株式会社 | Rear projector |
| JP2006309121A (en) | 2005-03-30 | 2006-11-09 | Fujinon Corp | Positioning structure |
| US7929223B2 (en) | 2005-09-30 | 2011-04-19 | Fujinon Corporation | Lens block, lens, holder for holding the lens block, and projector using the lens holder |
| JP4815388B2 (en) | 2007-04-26 | 2011-11-16 | 富士フイルム株式会社 | Projection lens unit and manufacturing method thereof |
| JP5487251B2 (en) * | 2012-07-06 | 2014-05-07 | 日立コンシューマエレクトロニクス株式会社 | Projection-type image display device and projection optical unit |
| KR101483976B1 (en) * | 2014-04-28 | 2015-01-19 | 주식회사 세코닉스 | Projection system of ultra short throw projector using plane mirror |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4526442A (en) * | 1981-01-28 | 1985-07-02 | U.S. Precision Lens, Inc. | Compact projection lens |
| US4620773A (en) * | 1982-05-15 | 1986-11-04 | Hitachi, Ltd. | Projection lens for projection television |
| JPS6253416U (en) * | 1985-09-21 | 1987-04-02 | ||
| US5442484A (en) * | 1992-01-06 | 1995-08-15 | Mitsubishi Denki Kabushiki Kaisha | Retro-focus type lens and projection-type display apparatus |
| US5692820A (en) * | 1992-02-20 | 1997-12-02 | Kopin Corporation | Projection monitor |
| JP3320862B2 (en) * | 1992-11-26 | 2002-09-03 | 旭光学工業株式会社 | Pupil conjugate coupling device for projection optical system |
| GB9503859D0 (en) * | 1995-02-25 | 1995-04-19 | Philips Electronics Uk Ltd | Projection lenses for light valve projection systems |
| KR100210247B1 (en) * | 1996-01-24 | 1999-07-15 | 윤종용 | An optic angle lcd projection lens system |
| JPH1031425A (en) * | 1996-07-17 | 1998-02-03 | Canon Inc | Projection type display device |
-
1998
- 1998-11-17 KR KR1019980049220A patent/KR100292356B1/en not_active IP Right Cessation
-
1999
- 1999-11-15 GB GB9926818A patent/GB2343966B/en not_active Expired - Fee Related
- 1999-11-16 JP JP11325749A patent/JP2000187274A/en active Pending
- 1999-11-17 DE DE19955332A patent/DE19955332A1/en not_active Ceased
- 1999-11-17 CN CN99124452A patent/CN1254101A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1300617C (en) * | 2003-08-11 | 2007-02-14 | 株式会社日立制作所 | Projector optical unit, projection type image display apparatus, and rear projection type image display apparatus using the said projector optical unit |
| CN100414433C (en) * | 2003-11-28 | 2008-08-27 | 株式会社日立制作所 | Projection optical unit and projection image display apparatus |
| CN103926675A (en) * | 2013-01-14 | 2014-07-16 | 扬明光学股份有限公司 | Image reconstructing camera and projector |
| US9268143B2 (en) | 2013-01-14 | 2016-02-23 | Young Optics Inc. | Image rearranging lens and projection apparatus |
| CN109991737A (en) * | 2017-12-29 | 2019-07-09 | 深圳点石创新科技有限公司 | Optical projection system |
| CN108375865A (en) * | 2018-05-28 | 2018-08-07 | 长沙创荣电子科技有限公司 | Single chip type liquid crystal projector |
| CN115691383A (en) * | 2022-09-27 | 2023-02-03 | 惠科股份有限公司 | Display device and image display method thereof |
| CN115691383B (en) * | 2022-09-27 | 2023-12-22 | 惠科股份有限公司 | Display device and image display method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19955332A1 (en) | 2000-05-31 |
| GB9926818D0 (en) | 2000-01-12 |
| JP2000187274A (en) | 2000-07-04 |
| GB2343966A (en) | 2000-05-24 |
| KR20000032673A (en) | 2000-06-15 |
| KR100292356B1 (en) | 2001-06-01 |
| GB2343966B (en) | 2001-06-20 |
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Legal Events
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |