CN101026719A - Projection optical system and projection display device employing the same - Google Patents
Projection optical system and projection display device employing the same Download PDFInfo
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- CN101026719A CN101026719A CNA2007100043187A CN200710004318A CN101026719A CN 101026719 A CN101026719 A CN 101026719A CN A2007100043187 A CNA2007100043187 A CN A2007100043187A CN 200710004318 A CN200710004318 A CN 200710004318A CN 101026719 A CN101026719 A CN 101026719A
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- 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
- G02B27/18—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical projection, e.g. combination of mirror and condenser and objective
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- 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
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
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- 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
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
- G02B27/005—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration for correction of secondary colour or higher-order chromatic aberrations
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- 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
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0905—Dividing and/or superposing multiple light beams
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- 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
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4272—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having plural diffractive elements positioned sequentially along the optical path
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- 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
- G03B21/2013—Plural light sources
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- 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
- G03B21/2066—Reflectors in illumination beam
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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]
- H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
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- Lenses (AREA)
- Projection Apparatus (AREA)
Abstract
A projection optical system and a projection display device employing the projection optical system are provided. The projection optical system includes a display device displaying an image to be projected onto an image display region, and first and second optical systems sequentially disposed along an optical path from a screen to the display device. When the optical axis of the first optical system is taken as a reference axis, the image display region of the display device is disposed with parallel eccentricity to the reference axis, and the second optical system is disposed eccentrically to the reference axis. Thus, an image displayed on the image display region is enlarged and projected on a position that is eccentric with reference to the reference axis. The projection display device includes an illuminating unit radiating light for forming an image to be projected and the projection optical system.
Description
Technical field
The present invention relates to a kind of projection optical system and a kind of projection display equipment.More specifically, the present invention relates to a kind of with the position of light shaft offset on the offset projection optical system of projects images and the projection display equipment that comprises this optical projection system.
Background technology
Traditional projection display equipment is obliquely with display unit, as the image projection that shows in the projecting apparatus to being disposed in vertical surface, on the screen on the wall.For example, projection display equipment is installed on the desk or on the ceiling, and along the direction that is higher or lower than installation site projects images obliquely.Because it is angled that the optical axis of projection optical system is set as with screen, so the optical axis intersection of the surface tilt of screen ground and projection optical system.Therefore, the scalloping of projection, thus make the picture quality variation.
Therefore, can almost flatly arrange the optical axis of projection optical system so that projection optical system according to certain angle with the upper area of image projection to the effective image-region of projection optical system, this is called as offset projection.
For example, shown in Figure 9 as in the flat 11-249069 Japanese patent publication, in display optical system (projection display equipment), digital micro-mirror device (DMD) is arranged to eccentric abreast, thereby the marginal portion of the viewing area of DMD is corresponding to the optical axis of projection optical system, and DMD on half of a side of the view field of projection optical system, for example, projects image onto the top of view field with image projection.
In addition, though effectively haveing nothing to do with offset projection in the image-region, but have a kind of like this shadow casting technique: this technology can be used to projected image, so that the center that can make the optical axis of projection optical system and image display area by the image of proofreading and correct display unit in correspondence with each other, described display unit is set to eccentric abreast with respect to the optical axis of projection optical system.
For example, shown in the Fig. 1,2,5,6,9 and 10 during the 2000-39585 Japan Patent is open, projection display equipment has eccentric Optical devices, and these Optical devices are arranged between reflective display and the projection display equipment highly prejudicially.The center of the image display area of reflective display is corresponding with the optical axis of optical projection system, and wherein, described reflective display is set to eccentric with respect to the inclined light shaft ground of optical projection system.
Yet aforesaid traditional projection optical system and projection display equipment have following point.
For example in flat 11-249069 Japanese patent publication, because it is parallel to each other that the imaging surface of projection optical system and screen can be set to, even so when along the direction projects images that makes progress, can not produce the scalloping that causes around the rotation of screen owing to imaging surface yet.Yet projection optical system must project the entire image viewing area on the part of effective image display area, for example top.Projection optical system only can be used in the visual angle that comprises the close limit of the high unit of view with unsuitable aberration in the projection visual angle.Therefore, effective image display area that should the extended projection optical system or the number that increases optical element are to reduce aberration.As a result, the projection optical system change complicates greatly, and has increased the price of projection optical system.
Open according to the 2000-39585 Japan Patent, by between display unit and projection optical system, arranging the Optical devices that are provided with prejudicially the view field of the display unit that is provided with is prejudicially moved.Yet the 2000-39585 Japan Patent openly relates on the corresponding position, center by center that Optical devices is arranged on prejudicially the image projection zone and projection optical system realizes reducing of aberration.Therefore, it is with that the offset projection that display unit realizes is set prejudicially is irrelevant by parallel.That is, the 2000-39585 Japan Patent openly can not be applied to the offset projection optical system.
In order to use offset projection, viewing area one side on the offset direction is doubled, and should only use half of whole zone with the aberration that reduces, in this case, aberration obviously can not be reduced to the sort of degree of 2000-39585 Japan Patent in open.
Therefore, need a kind of projection display equipment that comprises improved projection optical system, wherein, described improved projection optical system can offset projection and is improved picture quality.
Summary of the invention
The invention provides a kind of projection optical system and a kind of projection display equipment that adopts this projection optical system, described projection optical system is throwed high quality graphic by utilizing simple structure to reduce aberration during offset projection.
According to exemplary embodiment of the present invention, projection optical system comprises: display unit is used to show the image that will be projected onto on the image display area; First optical system and second optical system are according to priority along the light path setting from the screen to the display unit.When the optical axis of first optical system was reference axis, the image display area of display unit was provided with prejudicially with respect to reference axis is parallel.Second optical system is provided with prejudicially with respect to reference axis, thereby on the image that shows on the image display area is exaggerated and is projected onto position with respect to reference axis off-centre.
According to another exemplary embodiment of the present invention, projection display equipment comprises illumination unit and projection optical system, and described illumination unit is used to shine that be used to form will be by the light of image projected.
According to exemplary embodiment of the present invention, around optical axis, be provided with prejudicially near first optical system of screen near second optical system of display unit.Therefore, around reference axis, be set in the image display area of parallel off-centre, can correct the direction of eccentric diffusion light beam according to the offset of second optical system.
The image display area of display unit is set to parallel off-centre around reference axis, promptly is used for offset projection, and light beam sees through the top of the picture altitude of projection optical system.Therefore, may increase aberration, and because image display area and reference axis are not corresponding each other, so in image projected, produce asymmetric aberration.
When second optical system is set to parallel off-centre,,, on the direction of parallel off-centre, produce as distortion with respect to the aberration of axle shifting part.Therefore, by parallel on respect to the identical direction of the parallel off-centre of the reference axis of image display area size and the symmetry that second optical system can be eliminated distortion and can improve distortion be set prejudicially.In addition, when second optical system is set to respectively to tilt around the direction of the parallel off-centre of reference axis and image display area when eccentric, can produce aberration with respect to the axle shifting part, as distortion, therefore, distortion be can eliminate by tilting second optical system is set prejudicially, thereby the size and the symmetry of distortion improved.
Therefore, even in the top of the picture altitude of first optical system, still exist aberration, as distortion, these aberrations of recoverable still in the scope of projects images.
In addition, the image projection device according to exemplary embodiment of the present invention utilizes described projection optical system to come the image of enlarged image viewing area.
Projection display equipment uses described projection optical system and therefore has the effect identical with projection optical system according to an exemplary embodiment of the present invention.
By the detailed description below in conjunction with the open exemplary embodiment of the present of accompanying drawing, other purpose of the present invention, advantage and outstanding feature will become clearer.
Description of drawings
By with reference to the accompanying drawings exemplary embodiment being described in detail, above and other characteristics of the present invention and advantage will be more readily apparent from, wherein:
Fig. 1 is the front view of projection display equipment according to an exemplary embodiment of the present invention;
Fig. 2 is the sectional view of the projection optical system that comprises optical axis in the projection display equipment that is used among Fig. 1;
Fig. 3 is the front view of the projection display equipment of another exemplary embodiment according to the present invention;
Fig. 4 is the sectional view of the projection optical system that comprises optical axis in the projection display equipment that is used among Fig. 3;
Fig. 5 be comprise optical axis Fig. 1 projection optical system and according to the sectional view of light path of the projection optical system of first to fourth distortion example;
Fig. 6 is the polar plot of the distortion of expression comparison example;
Fig. 7 A and Fig. 7 B are the polar plots of the distortion of the expression first distortion example and the second distortion example;
Fig. 8 A and Fig. 8 B are the polar plots of the distortion of statement the 3rd distortion example and the 3rd distortion example;
Fig. 9 is the schematic diagram of calculating location of the image surface curvature of expression each distortion example and comparison example.
In all accompanying drawings, identical label is appreciated that part, parts and the structure that indication is identical.
Embodiment
Referring now to accompanying drawing exemplary embodiment of the present invention is described more all sidedly.Omission is to the identical description of similar between the accompanying drawing or corresponding member.
Projection optical system and projection display equipment are according to an exemplary embodiment of the present invention hereinafter described.
Fig. 1 represents the front view of projection display equipment according to an exemplary embodiment of the present invention.Fig. 2 is the sectional view of the projection optical system that comprises optical axis in the projection display equipment that is used among Fig. 1.
Because accompanying drawing is a schematic diagram, so size or shape may be by exaggerative, and may not indicate position accurately, this point is applicable to following whole specification.
As shown in Figure 1, the projection display equipment in the exemplary embodiment of the present 1 comprises illumination unit 2, reflective display 3 and the projection optical system 4 that is set among the shell 1a.In addition, though show not that in the accompanying drawings also comprise the power supply unit and the device control units that are connected with reflective display 3 with illumination unit 2, power supply unit is used to drive projection display equipment 1, device control units is used to control projection display equipment 1.
In the exemplary embodiment of Fig. 1, the shell 1a of projection display equipment 1 flatly arranged, thereby the light beam of projection 5 is inclined upwardly from layout surface, thus with image projection to the screen of vertically installing with layout surface basically 6.Yet such layout and projecting direction are not limited to this structure, can use any suitable structure.For example, can make the surface tilt of screen 6, perhaps make projecting direction downward-sloping.
Can be from the light of illumination unit 2 irradiations according to suitable angular emission, so that the light of formula display unit 3 reflections that are reflected incides projection optical system 4.Yet, in the exemplary embodiment of Fig. 1, shine obliquely to the direction of top along below from screen 6 from the light of illumination unit 2, and the second optical system 4B by describing after a while, incide reflective display 3 then.In addition, can comprise that mirror or prism make light path folding with the form according to the layout of projection display equipment 1.
To carrying out spatial modulation from illumination unit 2 according to the irradiates light of each wavelength of irradiation pulsed exposure, and the image that separates of look is displayed on the image display area 3a that is covered by cover glass 3c and goes up (see figure 2) reflective display 3 according to picture signal.
At this not detailed presentation video viewing area 3a, but image display area 3a is formed by a plurality of spatial modulation elements, and each the spatial modulation element that is arranged on the display plane according to latticed form is corresponding with a pixel unit of picture signal.In the exemplary embodiment of Fig. 1 and Fig. 2, image display area 3a is formed by the rectangle of W * H, and wherein, W is long limit, and H is a minor face.Centre normal 3b represents the normal of display plane at the center of image display area 3a.
It is eccentric abreast with respect to the optical axis 4a of the first optical system 4A that will describe after a while that the image display area 3a of reflective display 3 is provided so that centre normal 3b, and its eccentric throw is a.Image display area 3a along basically with the relative direction setting of screen on the imaging surface of projection optical system 4.
The ratio of half of eccentric degree and the minor face of image display area 3a represents with axle offset amount Δ h, that is,
Δh＝a/(H/2) ...(1)。
The axle offset amount can be according to the offset projection condition enactment, and in the exemplary embodiment of Fig. 1 and Fig. 2, the axle offset amount satisfies following scope:
0＜Δh＜2.0 ...(2)，
Preferably, 1.0≤Δ h≤1.5 ... (3).
Projection optical system 4 is to be used for and will to be presented at that image on the image display area 3a of reflective display 3 amplifies and with the optical system of this image projection to the screen 6, and 4 couples of image display area 3a of projection optical system and screen 6 are all operated.
Projection optical system 4 is formed by the second optical system 4B and the first optical system 4A that are arranged in from reflective display 3 to screen on 6 the light path that mention successively.
The first optical system 4A has view angle theta
0The extended projection system.In the exemplary embodiment of Fig. 1 and Fig. 2, the first optical system 4A comprises first lens 11, second lens 12, the 3rd lens 13, the 4th lens 14, the 5th lens 15, the 6th lens 16 and the 7th lens 17 that are arranged on the optical axis 4a.Optical axis 4a is arranged to vertical with the layout surface of projection display equipment 1 basically.
Each lens can have the shape and the focal power (power) of the function that satisfies the extended projection system, and example is as follows.
The preferably protruding recessed meniscus lens of first lens 11 and second lens 12 (concavemeniscus lens) to screen 6.
The 3rd lens 13 are biconvex lens preferably.
The 4th lens 14 preferably begin the biconvex lens 14A of arranged in sequence and the lens that are connected of biconcave lens 14B formation from screen orientation.
The 5th lens 15 are biconcave lens preferably.
The 6th lens 16 are preferably protruding in the male bend moon of image display area 3a lens (convex meniscuslens).
The 7th lens 17 are biconvex lens preferably.
Therefore, to image display area 3a, projection optical system has negative (-) focal power, negative (-) focal power, just (+) focal power, just (+) focal power, negative (-) focal power, just (+) focal power and the structure of (+) focal power just from screen.
The second optical system 4B is the optical system with positive light coke that is used for adjusting light path between the first optical system 4A and reflective display 3 and makes light focusing, and this second optical system 4B is set to the off-centre with respect to optical axis 4a.In the exemplary embodiment of Fig. 1 and Fig. 2, the second optical system 4B is set to along eccentric with respect to the substantially parallel ground of optical axis 4a with the eccentric identical direction of reflective display 3, and its eccentric throw is b.Label 4b represents the optical axis of the second optical system 4B.
Because the size and Orientation of parallel eccentric degree changes according to the structure of projection optical system 4, so follow the tracks of light beam so that in the twist angle at the projected position place of enlarged image viewing area 3a or scope that symmetrical balance is arranged on permission.
Usually, the degree of the parallel off-centre relevant with distance b of the second optical system 4B can be less than the degree of the parallel off-centre relevant with distance a of reflective display 3, to obtain good effect.Therefore, when the second optical system 4B was provided with prejudicially, the image projection zone on the screen 6 did not change a lot, and keeps the offset projection state.
The second optical system 4B is only formed by observer's eye 18, and these lens are biconvex lens preferably, and wherein, the side of facing image display area 3a is the plane substantially.
Observer's eye 18 is in the face of image display area 3a.The cover glass 3c that does not have refracting power (refractive power) is set between observer's eye 18 and the image display area 3a.Therefore, the second optical system 4B as the Optical devices with refracting power is set near reflective display 3.
The second optical system 4B in the exemplary embodiment of Fig. 1 of the present invention and Fig. 2 is set on the light path between illumination unit 2 and the reflective display 3, and makes from the optical alignment of illumination unit 2 and be incident upon on the image display area 3a.
The operation of image projection device 1 is described below with reference to the optical function of projection optical system 4.
Also collimate by the second optical system 4B according to the illumination light of the timing of being scheduled to, as shown in Figure 2, also incide obliquely on the centre normal 3b of image display area 3a by cover glass 3c then from the predetermined wavelength of illumination unit 2 emissions.
Each spatial modulation element on the image display area 3a is according to being driven with presetted wavelength and the corresponding picture signal of timing, thereby be in open mode and closed condition, in open mode, after being reflected, irradiates light incides on the projection optical system 4, in off position, irradiates light is not reflected, thereby does not incide on the projection optical system 4 yet.
Therefore, the light by the spatial modulation element reflects that is in open mode is presented on the image display area 3a image.The light that is reflected is by cover glass 3c and incide on the second optical system 4B, then by second optical system 4B refraction with collimation and lead to the first optical system 4A.
Here, because observer's eye 18 is set to respect to the parallel off-centre of optical axis, its eccentric throw is b, so, to compare when coaxial with optical axis 4a with observer's eye 18, the direction of refraction changes according to the direction of off-centre.Therefore, light incides the incoming position of the first optical system 4A and incidence angle focal power and the focal length variations according to observer's eye 18.
Because observer's eye 18 is Optical devices with certain focal power that the reverberation of reflective display 3 is initially passed through, pass through observer's eye 18 so have the light of relatively little luminous diameter.Therefore, the image on the refractive effect of observer's eye 18 and the screen forms the inconsistent relevant aberration of geometry of position, as distortion or image surface curvature, rather than influences imaging aberration, as spherical aberration.For example, parallel Influence from Eccentric distortion, inclination Influence from Eccentric image surface curvature.
In addition, when the parallel off-centre relevant with distance b is suitably set, compare littler off-centre with the parallel off-centre of reflective display 3, can reduce distortion or improve symmetry by using.
Because above-mentioned off-centre, towards the zone of the image projection on the screen 6 the aberration on the light path of view field not to be covered may increase.Yet, because according to the mode of offset projection, not with image projection to this zone, so this problem can not take place.In the exemplary embodiment of Fig. 1 and Fig. 2, revise the aberration profile at all visual angles of projection optical system 4, with the aberration in the image projection zone of improving screen 6.
Incide that the first optical system 4A goes up and by the 7th lens 17, the 6th lens 16, the 5th lens 15, the 4th lens 14, the 3rd lens 13, second lens 12 and first lens 11 from the light of second optical system 4B emission, and, increase view angle theta by each refraction of described lens
1Thereby, on screen 6, form image.View angle theta
1Be the angle that obtains around central projection axle 5a, described central projection axle 5a is the axle that extends from optical axis 4a with being inclined upwardly.As shown in Figure 1, view angle theta
1Relevant with the enlargement ratio of projection optical system 4.
Therefore, be exaggerated and be incident upon on the screen 6 at the image that shows on the image display area 3a.Projected position on the screen 6 is the enlargement ratio by projection optical system 4 and determine with the degree of the parallel off-centre relevant apart from a of the centre normal 3b of image display area 3a roughly, and improves by the degree of the parallel off-centre relevant with the distance b of the second optical system 4B in the distortion of projected position.Therefore, can be offset the high-quality image of projection by projection display equipment 1.
The exemplary embodiment of Fig. 1 and Fig. 2 can be modified to various forms.That is, the off-centre of Optical devices can change over various forms according to above-mentioned structure.
For example, can also replace the parallel second optical system 4B that arranges prejudicially with this by making the second optical system 4B around tilting to be provided with prejudicially second optical system with all vertical axle rotation of the parallel eccentric direction of optical axis 4a and reflective display 3.Therefore, the rotation by direction can improve because the distortion that the parallel off-centre of reflective display 3 causes.
What can relate to the another kind modification that the exemplary embodiment of Fig. 1 and Fig. 2 is carried out is: except the off-centre of the second optical system 4B, some optical elements of the first optical system 4A can also parallelly be set prejudicially.With the combination of the parallel off-centre of another Optical devices distortion is waited to have produced different influences, thereby aberration is corrected more clearly.In addition since between the part of the Optical devices of the first optical system 4A and the second optical system 4B given best offset, so can reduce influence to other aberration.
In addition, refer to the optical axis of the first optical system 4A after some elements of the first optical system 4A that eliminating is provided with prejudicially as the optical axis 4a of the first optical system 4A of the reference axis of projection optical system 4.
Can carry out another kind to the exemplary embodiment of Fig. 1 and Fig. 2 and revise, this modification increases some optical elements by making reflective display 3, the second optical system 4B or the first optical system 4A around the inclination off-centre that obtains with all vertical axle rotation of the parallel eccentric direction of optical axis 4a and reflective display 3.
The eccentric influence usually image surface curvature mentioned above that tilts, thus the inconsistent of image on the imaging surface can be improved, and make high-quality offset projection become possibility.
According to the structure of projection optical system 4, consider influence to other aberration, can suitably set eccentric direction and eccentric degree.For example, parallel off-centre reduces distortion, but can make the image surface curvature variation.Therefore, can increase the eccentric degree that tilts to reduce distortion and image surface curvature.
The projection optical system and the projection display equipment of another exemplary embodiment according to the present invention are below described.
Fig. 3 is the front view of the projection display equipment of another exemplary embodiment according to the present invention.Fig. 4 is the projection optical system that comprises optical axis that is used in the projection display equipment of Fig. 3.
To regularly carrying out spatial modulation from the rear surface of display surface by the illumination light of the predetermined wavelength of illumination unit 2 irradiations according to irradiation, and this transmission-type display unit 7 is presented at the image that look separates on the image display area 7a transmission-type display unit 7 according to picture signal.Transmission-type display unit 7 can be, for example LCD (LCD).
In the exemplary embodiment of Fig. 3 and Fig. 4, for convenience of explanation, transmission-type display unit 7 forms the single face template.Traditional transmission-type display unit forms and comprises three panel types that are used for R, G, B optical transmission formula spatial modulation device, as LCD, and traditional transmission-type display unit comprises the color scheme unit, and this color scheme unit is used to make the light combination by each transmission-type spatial modulation device.The color scheme unit need be arranged between projection optical system 4 and the transmission-type display unit 7a.Yet, in current description, omitted the color scheme unit.In addition, the display surface of three transmission-type spatial modulation devices forms image display area, and the color scheme unit is arranged on the optical equivalence position this image display area.
The reflective display 3 that the position of the image display area 7a of transmission-type display unit 7 is arranged in the exemplary embodiment with Fig. 1 and Fig. 2 is identical with respect to the position of projection optics system 4.That is, image display area 7a is set to eccentric abreast with respect to the optical axis 4a of the first optical system 4A, and its eccentric throw is a, and the screen that image display area 7a is set on the imaging surface with projection optical system 4 is relative.
In addition, the definition in the exemplary embodiment of axle offset amount Δ h and Fig. 1 and Fig. 2 is identical.
As mentioned above, the projection display equipment 10 in the exemplary embodiment of Fig. 3 of the present invention and Fig. 4 utilizes transmission-type display unit 7 to replace reflective display 3.
Therefore, can penetrate irradiates light from the rear surface of transmission-type display unit 2, thereby, easily illumination unit 2 is not arranged as and disturbs with projection optical system 4, thus the degree of freedom of the layout of raising device.
In addition, because the difference of the exemplary embodiment of the current exemplary embodiment of Fig. 3 and Fig. 4 and previous Fig. 1 and Fig. 2 only is: in current exemplary embodiment, irradiates light from illumination unit 2 is not introduced in the transmission-type display unit by the second optical system 4B, so, about 6 light path and optical function aspect from the transmission-type display unit to screen, the projection optical system in the current exemplary embodiment is compared with previous exemplary embodiment has identical effect.
Therefore, projection optical system 4 makes the image that is presented on the image display area 7a be exaggerated and be projected onto on the screen 6.Launching position on the screen 6 is haply by determining with the degree of the parallel off-centre relevant apart from a of the centre normal of image display area 7a.Distortion at the launching position place can be reduced by the degree of the parallel off-centre relevant with the distance b of the second optical system 4B.Therefore, projection display equipment 10 can be offset the high-quality image of projection.
With reference to previous Fig. 1 and the exemplary embodiment of Fig. 2, the projection display equipment of the exemplary embodiment of Fig. 3 of the present invention and Fig. 4 also can be according to modified in various manners.
In addition, in utilizing the previous exemplary embodiment of reflective display 3, be introduced to image display area 3a from the illumination light of illumination unit 2 by the second optical system 4B, but be not limited thereto.For example, can suitably set the control degree of the illumination light in the illumination unit 2, and irradiates light is not irradiated on the image display area 3a by the second optical system 4B.
The above-mentioned second optical system 4B forms single lens.Yet the second optical system 4B can form one group of lens.
Above-mentioned display unit is formed by a spatial modulation device or a plurality of spatial modulation device and color scheme unit, and the image display surface of spatial modulation device becomes image display area.Yet image display area can be different from the image display surface of spatial modulation device, that is, the image on the image display surface of spatial modulation device can be formed on another display surface.
Orthographic projection formula projection display equipment described above, in orthographic projection formula projection display equipment, with image projection to the screen that is installed in the projection display equipment outside.Yet, also can use the back projection type projection display equipment, in the back projection type projection display equipment, with image from the transmissive viewing screen of internal transmission to the outer peripheral portion that is formed on projection display equipment of device.
The axle offset direction of display unit is described as be on the direction of minor face of image display area 3a, but is not limited thereto.For example, when the axle offset direction be image display area 3a long limit direction or on other direction, can obtain identical effect by the offset direction that changes display unit.
Some optical elements of display unit, second optical system and first optical system are described to have constant off-centre, but, can manually or automatically regulate as required some optical elements of display unit, second optical system and first optical system by the setting-up eccentricity change unit.
The parts of describing in the example of each exemplary embodiment and variation thereof can be realized by making up within the spirit and scope of the present invention.
Below describe according to first of the exemplary embodiment of Fig. 1 and Fig. 2 and be deformed into the projection optical system of the 4th distortion and the comparison example of traditional technological system.
Fig. 5 be comprise optical axis Fig. 1 projection optical system and according to the sectional view of light path of the projection optical system of first to fourth distortion example.In each distortion example, some Optical devices are provided with prejudicially, because the eccentric degree of each Optical devices is all little, so utilize an accompanying drawing to describe the distortion example.
Below, screen 6 is made as the positive direction of y axle with the vertical parallel eccentric direction of optical axis 4a (among Fig. 1,2 and 5 upward to).The direction vertical with the y axle, promptly the positive direction of paper is set as x axle positive direction.Image display area 3a is that width is W on the x direction of principal axis, be the rectangle of H highly on the y direction of principal axis, and the parallel eccentric b among Fig. 1 is on the negative direction of y axle.
In the first distortion example, the second optical system 4B is set on the negative direction of y axle eccentric abreast, and eccentric throw is 0.3mm.The first distortion example is the example with reference to the exemplary embodiment of Fig. 1.
In the second distortion example, image display area (imaging surface) 3a is tilted prejudicially and is provided with, so that image display area is compared the angle that turned clockwise 6 fens with cover glass 3c on paper with the first distortion example.
In the 3rd distortion example, the second optical system 4B is set to eccentric obliquely, 1.5 degree so that the second optical system 4B turns clockwise on paper (1 degree 30 minutes).In the 4th distortion example, the 3rd first lens 11 that are out of shape the first optical system 4A of example are set to off-centre obliquely, on paper so that first lens 11 of the first optical system 4A turned clockwise 33 fens.
Comparison example is used for reducing ratio with respect to the system-computed aberration of conventional art, and shows that the parallel off-centre of the second optical system 4B of the first distortion example is 0mm, that is, 4a is coaxial with optical axis.
The focal length of distortion example is 16.4mm, and the F number is 2.3.
Below the expression have the infinite distance lens data.The variable r of Fig. 5
iAnd d
i(i is an integer) is corresponding to the r that indicates below
iAnd d
iThe unit of length is a millimeter.Refractive index is with respect to d line (wavelength is 587.56mm).
| The surface object | Radius of curvature ∞ | Apart from ∞ | Eccentric throw | Refractive index | Abbe number |
| 1 | r 1＝44.054 | d 1＝2.000 | α1 | n 1＝1.5163 | v 1＝64.1 |
| 2 | r 2＝14.882 | d 2＝5.168 | α1 | ||
| 3 | r 3＝58.054 | d 3＝2.000 | n 2＝1.5163 | v 2＝64.1 | |
| 4 | r 4＝20.547 | d 4＝9.075 | |||
| 5 | r 5＝226.227 | d 5＝3.000 | n 3＝1.8052 | v 3＝25.4 | |
| 6 | r 6＝-31.665 | d 6＝2.766 | |||
| 7 | r 7＝16.829 | d 7＝5.000 | n 4＝1.8061 | v 4＝40.9 | |
| 8 | r 8＝-13.402 | d 8＝2.000 | n 5＝1.6990 | v 5＝30.1 | |
| 9 | r 9＝25.399 | d 9＝1.557 | |||
| 10 | r 10＝-18.655 | d 10＝1.750 | n 6＝1.8052 | v 6＝25.4 | |
| 11 | r 11＝21.401 | d 11＝0.981 | |||
| 12 | r 12＝-135.750 | d 12＝3.500 | n 7＝1.6031 | v 7＝60.7 |
| 13 | r 13＝-16.139 | d 13＝0.200 | |||
| 14 | r 14＝91.202 | d 14＝3.500 | n 8＝1.6031 | v 8＝60.7 | |
| 15 | r 15＝22.576 | d 15＝15.000 | |||
| 16 | r 16＝25.848 | d 16＝6.500 | y 1，α 2 | n 9＝1.7200 | v 9＝50.2 |
| 17 | r 17＝3092.900 | d 17＝2.500 | y 1，α 2 | ||
| 18 | r 18＝∞ | d 18＝3.000 | α 3 | n 10＝1.4875 | v 10＝70.4 |
| 19 | r 19＝∞ | d 19＝0.500 | α 3 | ||
| Image | ∞ | α 3 |
Here, y
1Represent parallel off-centre,, α
1, α
2And α
3Expression is tilted eccentric, and each distortion example has following train value.Each direction is (shown in the arrow among Fig. 5) as mentioned above.
| y 1(mm) | α 1(branch) | α 2(degree) | α 3(branch) | |
| Distortion example 1 | 0.3 | 0 | 0 | 0 |
| Distortion example 2 | 0.3 | 0 | 0 | 6 |
| Distortion example 3 | 0 | 0 | 1.5 | 0 |
| Distortion example 4 | 0 | 33 | 1.5 | 0 |
| Comparison example | 0 | 0 | 0 | 0 |
Then be described being out of shape the example and the distortion of comparison example and the calculating of image surface curvature.
Can calculate from the value on the image display area 3a by following the trail of reverse light beam.
Fig. 6 is the polar plot of the distortion of expression comparison example.The trunnion axis of the polar plot of expression distortion represents with the millimeter to be the picture altitude on the x direction (X picture altitude) of unit, and vertical axis represents with the millimeter to be the picture altitude on the y direction (Y picture altitude) of unit.In the drawings, the calculating location of distortion is set as the grid point of arrow starting point, and the direction of distortion is by the direction indication of arrow, and the size of distortion is represented with respect to the length of scale that by arrow line this is applicable to following institute drawings attached.Fig. 7 A and Fig. 7 B are respectively the polar plots of the distortion of the expression first distortion example and the second distortion example.Fig. 8 A and Fig. 8 B are respectively the polar plots of the distortion of expression the 3rd distortion example and the 4th distortion example.Fig. 9 is the schematic diagram of the calculating location of expression comparison example and the image surface curvature of being out of shape example.
Following table 1 shows the maximum distortion value (Dmax) of each distortion example and improves than (%).
Improve than being by obtaining with the difference of the Dmax of comparison example and each distortion example Dmax divided by comparison example.
Table 1
| Dmax(mm) | Improvement is than (%) | |
| Distortion example 1 | 0.240 | 13.7 |
| Distortion example 2 | 0.244 | 12.2 |
| Distortion example 3 | 0.268 | 3.6 |
| Distortion example 4 | 0.280 | -0.7 |
| Comparison example | 0.278 | 0 |
The calculating of the image surface curvature of following each distortion example of table 2 expression.
Table 2
| Unit (mm) | |||||||
| C ++ | C +- | C 00 | C -+ | C -- | max-min | Improvement is than (%) | |
| Distortion example 1 | -0.0104 | -0.1590 | -0.0220 | -0.0104 | -0.1590 | 0.1486 | -6.8 |
| Distortion example 2 | -0.0083 | -0.1432 | -0.0130 | -0.0083 | -0.1432 | 0.1349 | 3.0 |
| Distortion example 3 | -0.0192 | -0.2658 | -0.0794 | -0.0192 | -0.2658 | 0.2466 | -77.0 |
| Distortion example 4 | -0.0099 | -0.1499 | -0.0406 | -0.0099 | -0.1499 | 0.1399 | -0.6 |
| Comparison example | -0.0070 | -0.1459 | -0.0070 | -0.0070 | -0.1459 | 0.1391 | 0 |
With the millimeter is each image surface curvature C of unit
++, C
+-, C__, C_
+And C
00Each summit and center among the 3a of presentation video viewing area, and corresponding to the summit 3g on the summit 3f on the summit 3e on the summit 3d on X-axis positive direction and the Y-axis positive direction, X-axis positive direction and the Y-axis negative direction, X-axis negative direction and the Y-axis positive direction, X-axis negative direction and the Y-axis negative direction and with centre normal intersect center 3b, as shown in Figure 9.
The maximum of the image surface curvature among the column in the table 2 (max-min) the presentation video viewing area 3a and minimum value poor.
Improve than by obtaining divided by (max-min) value of comparison example with the difference of (max-min) value of comparison example (max-min) value and each distortion example.
Around the center of X picture altitude, the distortion of comparison example is minimum on the positive direction of Y picture altitude, and is increasing on the negative direction of Y picture altitude and on the zone that the absolute value of X picture altitude increases, as shown in Figure 6.Therefore, direction on the image of projection and below upwards produce irregular distortion, thereby make the picture quality variation.
The image surface curvature of comparison example is bigger at summit 3e and 3g place, as shown in Figure 6.Therefore, image is not aimed at focus around this zone.
In the first distortion example, it is minimum that distortion becomes at the center of the image display area 3a shown in Fig. 7 A, thereby improved up the symmetry to the twist angle that makes progress with the below.In addition, as shown in Figure 1, compare with comparison example, Dmax has improved 13.7%.
Therefore, in the first distortion example, owing to the second optical system 4B significantly reduces distortion along the parallel off-centre of the direction that is distorted.
Simultaneously, according to table 2, compare with the image surface curvature of comparison example, the image surface curvature of the first distortion example is the poorest.
In the second distortion example, shown in Fig. 7 B, the trend of the distortion trend with the first distortion example haply is identical, and compares with the Dmax of comparison example, and the Dmax of second example improves 12.2%, and is as shown in table 1.
Therefore, even be that the first distortion example adds the inclination off-centre of reflective display 3, similar to the second distortion example, distortion also significantly reduces, and its decrease and first is out of shape identical in the example.
Simultaneously, according to table 2, the value of the image surface curvature of the second distortion example is more near the image surface curvature of comparison example, rather than more near the image surface curvature of the first distortion example.Therefore, the difference of image surface curvature is compared with comparison example and has been improved 3.0%.
Therefore, by parallel off-centre and inclination off-centre are combined, distortion reduces, and image surface curvature improves.
In the 3rd distortion example, shown in Fig. 8 A, the trend of the distortion roughly trend with first comparison example is identical, compares with the Dmax of comparison example, and the Dmax of the 3rd distortion example has improved 3.6%, and is as shown in table 1.
Therefore, the degree that scalloping reduces is less relatively, but the symmetry of scalloping improves.
Simultaneously, according to table 2, compare with comparison example, image surface curvature may variation.
In the 4th distortion example, distortion Dmax is-0.7%, and the comparison example with shown in Figure 6 is identical basically, and on shown in Fig. 8 B direction and below similar in the symmetry that makes progress and first comparison example, be suitable.Therefore, improved the symmetry of scalloping.
According to table 2, the image surface curvature of the 4th distortion example is compared with the 3rd comparison example and is significantly improved, and identical with comparison example basically, is-0.6%.
Can find out obviously that by these results the second optical system 4B has reduced distortion under the parallel off-centre and the eccentric situation that tilts.
In addition, increase inclination off-centre by some optical elements and can improve image surface curvature for the reflective display 3 and the first optical system 4A.
Therefore,, can reduce distortion and can improve image surface curvature parallel off-centre or inclination eccentric combination by suitably, thereby improve picture quality.
When the direction of off-centre was put upside down, the direction that aberration changes was also put upside down, and therefore can optimize whole aberration by the direction that changes Optical devices where necessary.
Projection optical system and projection display apparatus according to an exemplary embodiment of the present invention, second optical system that is set near the off-centre the display unit can make in image display area and be reduced by the aberration on the zone of offset projection.Therefore, utilize simple structure just can reduce aberration, with the projection high quality graphic.
Though shown particularly and described the present invention with reference to exemplary embodiment of the present invention, but those of ordinary skills are to be understood that, under the situation that does not break away from the spirit and scope of the present invention that are defined by the claims, can carry out various changes in the form and details.
The application requires to be submitted to the 2006-042394 Japanese patent application of Japanese Department of Intellectual Property and to be submitted to the rights and interests of the 10-2006-0082936 korean patent application of Korea S Department of Intellectual Property on August 30th, 2006 on February 20th, 2006, by reference the whole of these two applications openly is contained in this.
Claims (14)
1, a kind of projection optical system comprises:
Display unit is used to show the image that will be projected onto on the image display area;
First optical system and second optical system, according to priority along the light path setting from the screen to the display unit, wherein, when the optical axis of first optical system is reference axis, the image display area of display unit is provided with prejudicially with respect to reference axis is parallel, second optical system is provided with prejudicially with respect to reference axis, thereby on the image that shows on the image display area is exaggerated and is projected onto position with respect to reference axis off-centre.
2, projection optical system as claimed in claim 1 wherein, is set to approach most display unit as second optical system of the Optical devices with refracting power.
3, projection optical system as claimed in claim 1, wherein, second optical system is set to respect to the parallel off-centre of reference axis.
4, projection optical system as claimed in claim 1, wherein, second optical system is set to tilt with respect to reference axis eccentric.
5, projection optical system as claimed in claim 1, wherein, first optical system is formed by a plurality of optical elements.
6, projection optical system as claimed in claim 5, wherein, at least one in described a plurality of optical elements of first optical system is set to respect to the parallel off-centre of reference axis or tilts eccentric.
7, will play 1 described projection optical system as right, wherein, the image display area of display unit is set to tilt with respect to reference axis eccentric.
8, projection optical system as claimed in claim 5, wherein, the image display area of display unit is set to tilt with respect to reference axis eccentric.
9, a kind of projection display equipment comprises:
Illumination unit, being used for irradiates light will be by image projected to form;
Display unit is used to show the image that will be projected on the image display area;
First optical system and second optical system, according to priority along the light path setting from the screen to the display unit,
Wherein, when the optical axis of first optical system is reference axis, the image display area of display unit is provided with prejudicially with respect to reference axis is parallel, second optical system is provided with prejudicially with respect to reference axis, thereby on the image that shows on the image display area is exaggerated and is projected onto position with respect to reference axis off-centre.
10, projection display equipment as claimed in claim 9, wherein, the image display area of display unit is set to tilt with respect to reference axis eccentric.
11, projection display equipment as claimed in claim 9, wherein, display unit is a reflective display.
12, projection display equipment as claimed in claim 11, wherein, illumination unit is set to the front surface irradiates light to display unit.
13, projection display equipment as claimed in claim 9, wherein, display unit is the transmission-type display unit.
14, projection display equipment as claimed in claim 13, wherein, illumination unit is set to the rear surface of display unit irradiates light.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006042394 | 2006-02-20 | ||
| JP2006042394A JP2007219383A (en) | 2006-02-20 | 2006-02-20 | Projection optical system and image projection apparatus |
| KR1020060082936 | 2006-08-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101026719A true CN101026719A (en) | 2007-08-29 |
| CN100593324C CN100593324C (en) | 2010-03-03 |
Family
ID=38496732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710004318A Expired - Fee Related CN100593324C (en) | 2006-02-20 | 2007-01-22 | Projection optical system and projection display device employing the same |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2007219383A (en) |
| KR (2) | KR100860986B1 (en) |
| CN (1) | CN100593324C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106604002A (en) * | 2015-10-16 | 2017-04-26 | 豪威科技股份有限公司 | Multi-projector display box |
| CN114236824A (en) * | 2021-11-29 | 2022-03-25 | 歌尔光学科技有限公司 | Projection system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101091236B1 (en) | 2010-04-02 | 2011-12-07 | 엘지이노텍 주식회사 | Projector opitcal system |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3495860B2 (en) * | 1996-11-01 | 2004-02-09 | キヤノン株式会社 | Eccentric optical system and projection device using the same |
| US6076931A (en) * | 1997-11-14 | 2000-06-20 | Aurora Systems, Inc. | De-centered lens group for use in an off-axis projector |
| JP2000039585A (en) * | 1998-07-23 | 2000-02-08 | Minolta Co Ltd | Projection type display device |
| JP2000039582A (en) | 1998-07-23 | 2000-02-08 | Fuji Xerox Co Ltd | Video projector |
| JP2000171703A (en) | 1998-12-04 | 2000-06-23 | Sony Corp | Projection lens |
| JP3669933B2 (en) | 2000-04-25 | 2005-07-13 | 三菱電機株式会社 | Illumination device and projection display device |
| TW586014B (en) * | 2000-08-18 | 2004-05-01 | Seiko Epson Corp | Zoom lens device, optical device comprising the same, and projector |
| JP2003140049A (en) * | 2001-11-05 | 2003-05-14 | Canon Inc | Projection optical system and projector using the same |
| US20070091452A1 (en) | 2005-10-25 | 2007-04-26 | Scott Lerner | Projection system and method |
-
2006
- 2006-02-20 JP JP2006042394A patent/JP2007219383A/en active Pending
- 2006-08-30 KR KR1020060082936A patent/KR100860986B1/en not_active IP Right Cessation
-
2007
- 2007-01-22 CN CN200710004318A patent/CN100593324C/en not_active Expired - Fee Related
- 2007-02-16 KR KR1020070016771A patent/KR100856415B1/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106604002A (en) * | 2015-10-16 | 2017-04-26 | 豪威科技股份有限公司 | Multi-projector display box |
| CN114236824A (en) * | 2021-11-29 | 2022-03-25 | 歌尔光学科技有限公司 | Projection system |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100856415B1 (en) | 2008-09-04 |
| JP2007219383A (en) | 2007-08-30 |
| CN100593324C (en) | 2010-03-03 |
| KR20070083162A (en) | 2007-08-23 |
| KR20070083203A (en) | 2007-08-23 |
| KR100860986B1 (en) | 2008-09-30 |
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