CN1609655A - Reflective projection display system - Google Patents
Reflective projection display system Download PDFInfo
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- CN1609655A CN1609655A CN 200310101720 CN200310101720A CN1609655A CN 1609655 A CN1609655 A CN 1609655A CN 200310101720 CN200310101720 CN 200310101720 CN 200310101720 A CN200310101720 A CN 200310101720A CN 1609655 A CN1609655 A CN 1609655A
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- prism
- micro lens
- lens panel
- display system
- reflective micro
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Abstract
The present invention reveals one kind of reflecting projection display system capable of receiving light beam and projecting light to a screen in bright state. The reflecting projection display system of the present invention includes one reflecting micro mirror plate, one projector and one prism combination. The light beam is reflected by the prism combination before reaching the reflecting micro mirror plate, and in bright mode, the reflected light beam from the reflecting micro mirror plate passes through the prism combination before being received by the projecting lens. Under dark state, the reflected light beam from the reflecting micro mirror plate is total reflected in the interface between the prism near the reflecting micro mirror plate and the adjacent air interlayer.
Description
Technical field
The invention relates to a kind of reflection type projection display system, especially about a kind of projection display system that uses reflective micromirror.
Background technology
In recent years, enjoying attention such as the technology on the large-sized monitors such as rear-projection TV, and positive develop actively by reflective micromirror projection imaging.This technology mainly is to originate from the digital light treatment technology that Texas Instruments developed in 1987 (Digital light processingtechnology), and its image-forming principle is described below.
See also Fig. 1, the uniform incident ray 111 of lighting device 11 outputs enters the prism group of being made up of two prisms 121 and 122 (prism assembly) 12, is projected to digital micro-mirror assembly (Digital Micromirror Device after reflection; DMD) ten hundreds of micromirror (not shown) on 13.These micromirror that are positioned on the digital micro-mirror assembly 13 all have independent driving electrodes and steering axle.Under a bright morphotype formula (bright state mode), these micromirror can be with incident ray 111a reflection, through entering projection lens 141 behind prism 121 and 122 and focusing on the screen (not shown); Relatively, under a dark morphotype formula, these micromirror can be subjected to the driven electrode and the special angle that tilts, and incident ray 111a is penetrated partially, promptly depart from the optical axis 15 of projection lens 141 after making it by prism group 12.
Yet, one have projection display system 1 now at this point, because the deviated light line 111c under the dark attitude is the top outgoing from prism group 12, so have influence on the contrast of projection display system 1 in order to ensure projection lens 141 can never receive deviated light line 111c, must keep certain at least distance L between prism group 12 and the projection lens 141
D, enter projection lens 141 to avoid deviated light line 111c, but such way can increase back of the body defocus distance L
B, and strengthened the integral thickness L of projection display system 1
T, more increased the degree of difficulty (projection lens wide-angle design conditions one of be back of the body defocus distance more short better) of projection lens 141 in the wide-angle design.
On the other hand, for design and the manufacturing cost that reduces projection lens 141, although can adopt small-bore ψ
PProjection lens 141, and shorten distance L between projection lens 141 and the prism group 12 by this
D, and then the integral thickness L of shortening projection display system
TYet, because the exit direction of deviated light line 111c is all the time above prism group 12, therefore distance L between projection lens 141 and prism group 12
DReduction on be restricted all the time, in fact and can't effectively reduce the integral thickness of projection display system 1.
Therefore, the image quality that can represent on the large scale screen for projection display system in consumer market in recent years requires more and more strict, and under the expectation technical costs situation that can reduce, be necessary to seek to promote simultaneously the contrast of projection display system and the solution of reduced projection display system integral thickness.In order to solve aforementioned the problems of the prior art point at all, the present invention proposes a kind of projection display system that uses reflective micromirror assemblies, it can be under the prerequisite of keeping projection display system high brightness and high-contrast, the back of the body defocus distance of projection display system is contracted to the shortest, and dwindled the integral thickness of projection display system simultaneously.
The utility model content
The present invention proposes for solving the problem points that existing projection display system can't improve contrast and reduction system thickness simultaneously.
The objective of the invention is to, a kind of reflection type projection display system is provided, it has high-contrast.
Another object of the present invention is to, a kind of reflection type projection display system is provided, it has minimum system's thickness.
Reflection type projection display system provided by the invention, be in order to receive a light and under one first pattern with this ray cast to one screen on.
Reflection type projection display system provided by the invention comprises a reflective micro lens panel, a projection arrangement and a prism group.
One implements in the sample attitude, reflective micro lens panel of the present invention has plural micromirror, each these micromirror has a turning axle, and in a special angle scope, swing around this turning axle, this reflective micro lens panel reflects the optical axis direction of this light towards this reflection type projection display system under this first pattern, and under one second pattern this light is reflected towards the optical axis direction away from this reflection type projection display system.
In addition, projection arrangement of the present invention has a projection lens, and it receives under this first pattern reflection this light from this reflective micro lens panel, and with this ray cast to this screen.
Prism group of the present invention has plural prism, places between this reflective micro lens panel and this projection arrangement, has air blanketing between these adjacent prisms.
Of the present invention one is characterised in that, this light was reflected by this prism group before arriving this reflective micro lens panel, reflection is directly by being received by this projection lens after this prism group from this light of this reflective micro lens panel under this first pattern, and reflection is on the interface of these prisms of close this reflective micro lens panel and adjacent these air blanketings total reflection to take place from this light of this reflective micro lens panel under this second pattern.
Another feature of the present invention is, this reflective micro lens panel the span in a lateral direction of this screen less than this span on the longitudinal direction of reflective micro lens panel at this screen, and the turning axle of these micromirror is parallel with the longitudinal direction of this screen.
The present invention has following advantage: back of the body Jiao who the first, shortens projection display system; The second, guarantee that deviated light line and spurious rays under the dark morphotype formula can not enter in the projection lens, and then promote the contrast of projection display system; Three, effectively reduce the overall volume and the thickness of projection display system.
Description of drawings
Fig. 1 is a synoptic diagram, shows the reflection type projection display system of a prior art;
Fig. 2 A is a synoptic diagram, shows the projection of reflection type projection display system under bright morphotype formula of first embodiment of the invention;
Fig. 2 B is a synoptic diagram, shows the projection of reflection type projection display system under dark morphotype formula of first embodiment of the invention;
Fig. 3 is a synoptic diagram, reflective micro lens panel in the reflection type projection display system of demonstration first embodiment of the invention and the configuration relation between the screen; And
Fig. 4 is a synoptic diagram, reflective micro lens panel in the reflection type projection display system of demonstration second embodiment of the invention and the configuration relation between the screen.
Embodiment
See also Fig. 2 A and Fig. 2 B, the reflection type projection display system 2 of first embodiment of the invention comprises a lighting device 21, a prism group 22, a projection arrangement 23 and a reflective micro lens panel 24.Prism group 22 is to place between lighting device 21, projection arrangement 23 and the reflective micro lens panel 24.It below is each assembly that the reflection type projection display system 2 of present embodiment is described one by one.
The lighting device 21 of present embodiment includes a light source 211, a lampshade 212, a photoconductive tube (light guide) 213, one relay lens (relay lens) 214 and one collector lens 215.The light that the configuration relation of light source 211, lampshade 212 and photoconductive tube 213 just can make light source 211 be exported enters photoconductive tube 213 and enter prism group 22 after through relay lens 214 and collector lens 215.
The prism group 22 of present embodiment comprises three inner full-reflection (totally internalreflection; TIR) prism 221,222 and 223, have one air blanketing (air gap) 224 between prism 221 and the prism 222, and prism 221 and prism 222 also have air blanketing 225 between prism 223.Prism 223 is near reflective micro lens panel 24 configurations, and is provided with light absorbing medium 226 around.
The projection arrangement 23 of present embodiment comprises a projection lens 231 and a lens barrel 232.Projection lens 231 be received from 24 reflections of reflective micro lens panel and the light 26b by prism group 22 and with light 26b along the direction projection of optical axis 27 on screen 25, and lens barrel 232 is to be used for intercepting outer other the spurious rays of projection display system to enter projection lens 231.
Be the micromirror 241 with plural variable incidence on the reflective micro lens panel 24 of present embodiment, the detailed configuration of reflective micro lens panel 24 and micromirror 241 as shown in Figure 3.Each micromirror 241 is to rotate in a special angle scope around a turning axle 242.
Then, will the projection theory of the reflection type projection display system 2 of present embodiment be described.
Under bright morphotype formula, see also Fig. 2 A, the light 26 that lighting device 21 is exported can be reflected by prism 221 earlier and arrive on the reflective micro lens panel 24 after entering prism group 22.Then, the light 26b that is reflected via the micromirror 241 on the reflective micro lens panel 24 is in regular turn by entering projection lens 231 behind prism 223, air blanketing 225, prism 221, air blanketing 224 and the prism 222.
Under dark morphotype formula, see also Fig. 2 B, the light 26 that lighting device 21 is exported can be reflected by prism 221 earlier and arrive on the reflective micro lens panel 24 after entering prism group 22 equally.Yet, micromirror 241 on the reflective micro lens panel 24 is to have rotated a special angle around turning axle 242 at this moment, and on the interface that the prism 223 that makes incident ray 26a reflex to be close to reflective micro lens panel 24 and air blanketing 225 are shared, and make reflection ray 26c carry out inner full-reflection in prism 223 inside.Then, these light that carry out inner full-reflection in prism 223 inside will be absorbed by the light absorbing medium 226 that is provided with around the prism 223, can not enter projection lens 231 in order to do any reflection ray 26c more fully except that departing from optical axis 27.
In the present embodiment, because the light 26c that is reflected via the micromirror 241 on the reflective micro lens panel 24 under the dark morphotype formula can be fully by the projection lens 231 of diversion projection arrangement 23, so the distance L between the prism 222 in projection lens 231 and the prism group 22
DCan be reduced to quite little.In addition, the number of lens barrel 232 only need consider that the imaging demand under the bright morphotype formula gets final product, and does not avoid deviated light line under the dark morphotype formula and do not need to add extra peripheral unit, therefore can effectively promote the contrast and the brightness of whole projection display system 2.
In addition, also just because of the light 26c that is reflected via the micromirror 241 on the reflective micro lens panel 24 under the dark morphotype formula can be fully by the projection lens 231 of diversion projection arrangement 23, and projection lens 231 can be near 222 configurations of the prism in the prism group 22, and we can adopt aperture ψ simultaneously under the situation that does not influence whole projection display system 2 contrasts
P Little projection lens 231 and thickness L
P Smaller prisms group 22 is with the manufacturing cost that reduces projection lens and prism group and allow the design of projection lens and prism group be more prone to.In detail, see also Fig. 3, it is the reflective micro lens panel 24 that is rectangle of L2 for the L1 width that present embodiment adopts a length, and for instance, L1 can be 4 to 3 or 16 to 9 with the ratio of L2, can adopt foursquare micromirror 241.In the configuration, the minor face 24a of reflective micro lens panel 24 is that the horizontal direction (right and left of vision) 251 with screen 25 is optical parallel, the long limit 24b of reflective micro lens panel 24 is that the longitudinal direction (upper and lower of vision) 252 with screen 25 is optical parallel, and the turning axle 242 of micromirror 241 is that longitudinal direction 252 with screen 25 is optical parallel.In the case, the turning axle 242 of micromirror 241 is just parallel with the long limit 24b of reflective micro lens panel 24.Thus, reflective micro lens panel 24 just has the shortest span L2 on the horizontal direction 251 of screen 25, and then according to the shortest span L2 of this reflective micro lens panel 24, adopts aperture ψ accordingly
P Little projection lens 231 and thickness L
P Little prism group 22 is with the back of the body defocus distance L of further reduced projection display system 2
BAnd allow whole projection display system 2 have smaller volume and reach the purpose that the design that reduces manufacturing cost and allow projection lens and prism is more prone to.
For example, please referring again to Fig. 2 A and 2B, according to the thickness L of the prism group 22 that present embodiment adopted
PBe 15.1457mm, dwindled about 1.67 times compared to prior art shown in Figure 1 (25.31mm), and the back of the body defocus distance L of projection display system 2
BBe 18.2531mm, dwindled about 2.66 times compared to prior art shown in Figure 1 (48.5431mm).Apparently, the present invention utilizes the configuration mode of three-chip type inner full-reflection prism group 22 and above-mentioned reflective micro lens panel 24, will be under the dark morphotype formula light 26c diversion projection lens 231 of reflection micromirror 241 on reflection declines mirror board 24, allow distance L between projection lens 231 and the prism group 22
DCan reach the shortest configuration distance, thereby can worry that projection lens 231 can receive the deviated light line, so can adopt aperture ψ
P Little projection lens 231 and thickness L
P Little prism group 22, and then reduce the back of the body defocus distance L of projection display system effectively
B, and reduce the thickness L of whole projection display system 2 effectively
T
On the other hand, in second embodiment of the invention, except reflective micro lens panel 24 was configured to as shown in Figure 4, reflection type projection display system 2 other each parts were same with aforementioned person, do not repeat them here.It is the reflective micro lens panel 24 that is rectangle of L2 for the L1 width that present embodiment still adopts a length, and L1 can be 4 to 3 or 16 to 9 with the ratio of L2, and that be different from first embodiment is the micromirror 241a that adopts rhombus.In the present embodiment. the minor face 24a of reflective micro lens panel 24 is that the horizontal direction 251 with screen 25 is optical parallel, also be reflective micro lens panel 24 at the span L2 on the horizontal direction 251 of screen 25 less than its span L1 on screen 25 longitudinal directions 252, and the longitudinal direction 252 of the turning axle 242b of micromirror 241b and screen 25 is optical parallel.In other words, based on notion of the present invention. as long as its turning axle 242b is satisfied in the configuration of micromirror 241b and screen 25 longitudinal directions 252 are optical parallel, then the micromirror of reflective micro lens panel of the present invention can be an Any shape. for example be rectangle, circle, ellipse.
In sum, the present invention encyclopaedizes by the above embodiments and variation example.Yet, those skilled in the art should be appreciated that, all embodiment of the present invention only are exemplary at this but not are restricted, that is to say, do not breaking away within connotation of the present invention and the scope, other variation example of the above-mentioned reflection type projection display system of addressing and correction example are the present invention and contain.Therefore, the present invention is defined by appending claims.
Claims (10)
1. reflection type projection display system is characterized in that: described system receive a light and under one first pattern with described ray cast to a screen on, described reflection type projection display system comprises:
One reflective micro lens panel, has plural micromirror, micromirror such as each is described have a turning axle, and in a special angle scope, swing around described turning axle, described reflective micro lens panel reflects the optical axis direction of described light towards described reflection type projection display system under described first pattern, and under one second pattern described light is reflected towards the optical axis direction away from described reflection type projection display system;
One projection arrangement has a projection lens, and it receives under described first pattern described light of reflection from described reflective micro lens panel, and with described ray cast to described screen; And
One prism group, place between described reflective micro lens panel and the described projection arrangement, described prism group has one first prism, one second prism and a prism, exist between described first prism and described second prism to exist between one second air blanketing, described second prism and the described prism between one first air blanketing and described first prism and the described prism to have described second air blanketing, described prism is near described reflective micro lens panel configuration;
Wherein, described light before arriving described reflective micro lens panel by described first prismatic reflection, reflection is to be received by described projection lens after directly by described prism group from the described light of described reflective micro lens panel under described first pattern, and reflection is on the interface of described prism and described second air blanketing total reflection to take place from the described light of described reflective micro lens panel under described second pattern; And
Wherein, less than the span on the longitudinal direction of described reflective micro lens panel at described screen, and the turning axle of micromirror such as described is that longitudinal direction with described screen is optical parallel to described reflective micro lens panel in the span in a lateral direction of described screen.
2. reflection type projection display system as claimed in claim 1 is characterized in that: the turning axle of micromirror such as described is that the long limit with described reflective micro lens panel is optical parallel.
3. reflection type projection display system as claimed in claim 1 is characterized in that: the described light that total reflection takes place on the interface of described prism and described second air blanketing under described second pattern is in described prism inner full-reflection to take place.
4. reflection type projection display system as claimed in claim 1 is characterized in that: be provided with the light absorption material around the described prism.
5. reflection type projection display system as claimed in claim 1 is characterized in that: the shape of micromirror such as described be selected from rectangle, rhombus, circle and oval one of them.
6. reflection type projection display system is characterized in that: described system receive a light and under one first pattern with described ray cast to a screen on, described reflection type projection display system comprises:
One reflective micro lens panel, has plural micromirror, micromirror such as each is described have a turning axle, and in a special angle scope, swing around described turning axle, described reflective micro lens panel reflects the optical axis direction of described light towards described reflection type projection display system under described first pattern, and under one second pattern described light is reflected towards the optical axis direction away from described reflection type projection display system;
One projection arrangement has a projection lens, and it receives under described first pattern described light of reflection from described reflective micro lens panel, and with described ray cast to described screen; And
One prism group has plural prism, places between described reflective micro lens panel and the described projection arrangement, and there is air blanketing in adjacent described the grade between the prism;
Wherein, described light was reflected by described prism group before arriving described reflective micro lens panel, reflection is to be received by described projection lens after directly by described prism group from the described light of described reflective micro lens panel under described first pattern, and reflection is to wait near described reflective micro lens panel described on the interface of prism and adjacent air blanketing such as described total reflection takes place from the described light of described reflective micro lens panel under described second pattern; And
Wherein, less than the span on the longitudinal direction of described reflective micro lens panel at described screen, and the turning axle of micromirror such as described is that longitudinal direction with described screen is optical parallel to described reflective micro lens panel in the span in a lateral direction of described screen.
7. reflection type projection display system as claimed in claim 6 is characterized in that: in the described light that waits generation total reflection on prism and the adjacent described interface of waiting air blanketing near described reflective micro lens panel described is prism such as described at close described reflective micro lens panel inner full-reflection takes place under described second pattern.
8. reflection type projection display system as claimed in claim 6 is characterized in that: the turning axle of micromirror such as described is that the long limit with described reflective micro lens panel is optical parallel.
9. reflection type projection display system as claimed in claim 6 is characterized in that: the described prism that waits near described reflective micro lens panel is provided with the light absorption material on every side.
10. reflection type projection display system as claimed in claim 6 is characterized in that: the shape of micromirror such as described be selected from rectangle, rhombus, circle and oval one of them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310101720 CN1609655A (en) | 2003-10-21 | 2003-10-21 | Reflective projection display system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310101720 CN1609655A (en) | 2003-10-21 | 2003-10-21 | Reflective projection display system |
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| Publication Number | Publication Date |
|---|---|
| CN1609655A true CN1609655A (en) | 2005-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310101720 Pending CN1609655A (en) | 2003-10-21 | 2003-10-21 | Reflective projection display system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565897A (en) * | 2010-12-30 | 2012-07-11 | 比亚迪股份有限公司 | Prism system and projector with same |
| CN104656362A (en) * | 2015-02-12 | 2015-05-27 | 苏州佳世达光电有限公司 | Projector |
-
2003
- 2003-10-21 CN CN 200310101720 patent/CN1609655A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565897A (en) * | 2010-12-30 | 2012-07-11 | 比亚迪股份有限公司 | Prism system and projector with same |
| CN102565897B (en) * | 2010-12-30 | 2015-03-04 | 比亚迪股份有限公司 | Prism system and projector with same |
| CN104656362A (en) * | 2015-02-12 | 2015-05-27 | 苏州佳世达光电有限公司 | Projector |
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