CN103809361B

CN103809361B - Projection display system

Info

Publication number: CN103809361B
Application number: CN201310465508.4A
Authority: CN
Inventors: 吴震
Original assignee: Individual
Current assignee: Yang yi
Priority date: 2013-08-02
Filing date: 2013-10-08
Publication date: 2017-11-14
Anticipated expiration: 2033-10-08
Also published as: CN103809361A

Abstract

The input light that projection light source projects is projected on screen surface, and the input light is divided into the first input light and the second input light according to the difference of optical properties, and the two image carried is different, and is projected from projection light source；Screen includes prism array, there are the first filter coating and the second filter coating respectively on two normal directions of prism array different first surface and second surface, so that the input light for being incident in first surface is filtered into the first input light, the input light for being incident in second surface is filtered into the second input light, and the two has different exit directions by first surface and second surface refraction or reflection respectively.Projection display system proposed by the present invention, different images is formed in different directions, so the people in diverse location can be made to see different images, or two eyes of same person is seen different images, to form brand-new display effect.

Description

Projection display system

Technical field

The present invention relates to display technology field, more particularly to projection display system.

Background technology

Projection Display has been obtained for more and more applying at present.The principle of Projection Display will be schemed using projector As in light projection a to screen, the image light is scattered on the screen, and which part is by the image light of scattering by human eye institute Receive, in these image lights of human eye just as being issued on screen, image is formed on such screen.

Projection Display is divided into positive throwing and rear-projection.With spectators in the same side of screen, rear-projection is projector for Zheng Touji projectors With spectators in the relative both sides of screen.For positive throw, the effect of screen is to scatter and reflected image light, for rear-projection For, the effect of screen is then scattering and transmission image light.

The content of the invention

The present invention proposes a kind of projection display system, including a projection light source and a screen, what projection light source projected Input light is projected on screen surface, and the input light is divided into the first input light according to the difference of the optical properties such as wavelength or polarization state With the second input light, image that the first input light and the second input light are carried is different, and from projection light source simultaneously or timesharing is penetrated Go out；Screen includes prism array, has respectively on two normal directions of prism array different first surface and second surface First filter coating and the second filter coating so that the input light for being incident in first surface is filtered into the first input light, is incident in The input light on two surfaces is filtered into the second input light；First input light and the second input light are respectively by first surface and second Surface refraction or reflection and there is different exit directions so that when watching screen up to a little less A, whole horizontal view angle model Mutually non-overlapping the first angular field of view and the second angular field of view are certainly existed in enclosing, it can be seen that the in the first angular field of view One output light is just looked at less than the second output light, it can be seen that the second output light is just looked at less than the first output in the second angular field of view Light.

Projection display system proposed by the present invention, different images is formed in different directions, can so make in difference The people of position sees different images, or two eyes of same person is seen different images, to form brand-new show Show effect.

Brief description of the drawings

Fig. 1 and Fig. 2 is two citings of the operation principle of projection display system in the present invention；

Fig. 3 a and 3b are the top view and side view of one embodiment of projection display system of the present invention respectively；

Fig. 3 c are the structural representations of a citing of micro-structural on screen in Fig. 3 a illustrated embodiments；

Fig. 3 d be in Fig. 3 c the reflectivity of the first filter coating and the second filter coating with wavelength change schematic diagram；

Fig. 3 e and Fig. 3 f are the structural representations of two other citing of micro-structural on screen in Fig. 3 a illustrated embodiments；

Fig. 3 g are the reflectivity of the beam splitter layer of micro-structural shown in Fig. 3 f with wavelength change schematic diagram；

Fig. 3 h and Fig. 3 i are a kind of deformations of the micro-structural shown in Fig. 3 f；

Fig. 4 a are the top views of another embodiment of the projection display system of the present invention；

Fig. 4 b are a citings of micro-structural on screen in Fig. 4 a illustrated embodiments；

Fig. 5 a are the top views of another embodiment of the projection display system of the present invention；

Fig. 5 b and Fig. 5 c are the front view and upward view of a citing of screen in Fig. 5 a illustrated embodiments respectively；

Fig. 5 d and Fig. 5 e are the micro-structural schematic diagram of two positions on screen in Fig. 5 a illustrated embodiments respectively；

Fig. 5 f are the front views of another citing of the screen of the embodiment shown in Fig. 5 a；

Fig. 5 g are the schematic three dimensional views of the micro-structural of the screen shown in Fig. 5 f；

Fig. 6 a are the top views of another embodiment of the projection display system of the present invention；

Fig. 6 b are the front views of a citing of the screen of Fig. 6 a illustrated embodiments；

Fig. 6 c and Fig. 6 d are two citings of the side view of the screen of Fig. 6 a illustrated embodiments；

Fig. 7 is the top view of another embodiment of the projection display system of the present invention；

Fig. 8 a to Fig. 8 c are the other three citings of the operation principle of projection display system in the present invention；

Fig. 9 is the schematic diagram of effect of the scattering layer to light angle；

Figure 10 a to Figure 10 c are the improved signals done for Fig. 8 a to Fig. 8 c operation principle to Fig. 5 e micro-structural Figure；

Figure 11 is another citing of the operation principle of projection display system in the present invention；

Figure 12 a and Figure 12 b are the improved schematic diagrames done for Figure 11 operation principle to Fig. 5 e micro-structural.

Embodiment

Fig. 1 and Fig. 2 is the citing of two kinds of working methods for projection display system proposed by the invention.In Fig. 1, screen Curtain 101 is used to receive input light（Input light is not drawn into）, and the projection of at least part input light is carried into different figures respectively for two beams The first output light 111 and the second output light 112 of picture, and the exit direction of the first output light 111 and the second output light 112 is not Together.In the present invention, light beam " carrying " image refers to that light beam carries image information according to picture signal by modulation, and " throws Penetrate " it is interpreted as to specific direction or the outgoing of specific direction scope.Eyes 141 and 142 represent two viewings respectively in figure People where position, it can be seen that three light for representing the first output light 111 are incident in eyes 141, for generation Three light of the second output light of table 112 are then incident in eyes 142.Therefore eyes 141 can see first on screen 101 Image entrained by output light 111, the image entrained by less than the second output light 112 is just looked at, while eyes 142 can be in screen The image entrained by the second output light 112 is seen on 101, just looks at the image entrained by less than the first output light 111.It is such good Be in, only use same screen, take unique screen space, it is possible to provide different images for the people of different azimuth Display.This is expressly intended to apply to multiple fields, such as window advertising, and same pedestrian walks can see not in different positions Same ad content, cost is saved while propaganda objective is reached.

The function of screen 201 in Fig. 2 approaches with Fig. 1, and difference is, the first output light 211 and the second output light 212 exit direction is closer to some, and now eyes 241 and eyes 242 represent the left and right two of same observer respectively Eyes.Likewise, eyes 241 can see the image entrained by the first output light 211 on screen 201, just look at less than Image entrained by two output lights 212, while eyes 242 can see the figure entrained by the second output light 212 on screen 201 Picture, the image entrained by less than the first output light 211 is just looked at, i.e. two eyes of observer see picture material difference.So only The picture material of the first output light 211 and the second output light 212 is controlled to correspond respectively to the figure of left eye and right eye in 3D rendering Picture, observer is just it can be seen that 3D rendering effect.

Two examples are used only above and illustrate the projection display system of the present invention and the operation principle of screen.Below in conjunction with Accompanying drawing illustrates the concrete methods of realizing of this projection display system and its screen.

In the following description, as there is no specified otherwise, then：

1. input light is represented with dotted line, the first output light is represented with solid line, and the second output light is represented by dotted lines；

2. for convenience of description, upper and lower angle direction is equal to the vertical angles direction of screen, left and right angle direction is equal In the level angle direction of screen；

3. the first output light points to left, the second output light sensing right side, but this simply illustrates, and is not limitation.

Fig. 3 a are the top views of the projection display system shown in first embodiment of the invention.Wherein, projection light source 351 is located at Middle part on the left and right directions of screen 301, and it is located at observer the homonymy of screen 301.Therefore the effect of screen 301 is to reflect The light that projection light source 351 is sent sees its observed person.The input light represented with dotted line（Light 321a and 321b are wherein Two light）Projected from projection light source 351 and be projected on screen 301, the range of exposures of input light covers whole screen ranges. Carry out the reflecting effect of account for screen 301 by taking light 321a and 321b as an example.After light 321a is incident in the 301a regions on screen, Two parts are divided into by screen, this two parts light respectively by screen reflection to different directions with formed output light 311a and 312a, light 311a are projected toward left side, and light 312a, which is projected, to turn right.Light 321b is incident in the 301b regions on screen Afterwards, two parts are divided into by screen, this two parts light respectively by screen reflection to different direction formed output light 311b and 312b, light 311b are projected toward left side, and light 312b, which is projected, to turn right.

Fig. 3 b are the side view of the projection display system shown in Fig. 3 a.Projection light source 351 is located on the above-below direction of screen 301 Bottom, light 321a is reflected into output light 311a and 312a by screen 301, and light 321b is reflected into output by screen 301 Light 311b and 312b.

From Fig. 3 a and Fig. 3 b, the effect of screen 301 is to control respectively in left and right angle direction and upper and lower angle direction System input light 321a and 321b make the output light that it is reflected to form on specific direction.In screen described in the invention and throwing In shadow display system, it is preferred that emphasis is screen on the angle direction of left and right to input light and the control method of output light, it is and right Method of the prior art can be then used in the control to input light and output light on upper and lower angle direction.Such as The most frequently used method is that light is sufficiently scattered on upper and lower angle direction so that incident input below from screen Light will not directly be specularly reflected on upper and lower angle direction and be emitted upwards, but be scattered on upper and lower angle direction Sizable scope is covered, the eyes of observer can be incident in guarantee section reflected light.In another example another conventional side Method is the reflection being oriented using the micro-structural on screen to incident input light below screen（Refer to the attached drawing 6c and 6d）, it is reflected to the eyes of observer, such to be advantageous in that the light intensity for being incident in observer's eyes is larger, shortcoming exists It is small in the angular coverage of reflected light, for the angle of observer be exactly screen angular field of view it is small.Of course it is to be understood that Both control methods to upper and lower angle direction glazed thread can also be used in combination.No matter which kind of is used to upper and lower angle direction The control method of glazed thread, all have no effect on the effect of the present invention.To the controlling party of left and right angle direction glazed thread in the present invention Method can combine any one control method use to upper and lower angle direction glazed thread, and this present invention is not limited.

Fig. 3 c and Fig. 3 e are respectively the structural representation in the 301b regions and 301a regions to the right at middle part on screen in Fig. 3 a Figure, the method for work of screen 301 in the present embodiment will be illustrated respectively in connection with Fig. 3 c and Fig. 3 e below.

Light will be inputted on the angle direction of left and right with reference to how Fig. 3 c descriptions are realized on central region 301b first 321b reflexes to different directions to form output light 311b and 312b method.301b regions on screen, including at least One prism unit 302b, these prism units form a prism array（Only marked in Fig. 3 c a prism unit 302b with Signal）.The incident direction of prism unit 302b towards input light includes different two faces of normal direction, first surface and the Two surfaces.The first filter coating 304b is coated with the first surface of prism unit so that be incident in the input light of first surface 321b is divided into two beams, and a branch of is reflected light 311b, and a branch of is transmitted light 331b, and wherein transmitted light 331b is arranged at prism battle array The absorbed layer 303b for arranging rear absorbs.The second filter coating 305b is coated with the second surface of prism unit so that be incident in The input light 321b on two surfaces is divided into two beams, and a branch of is reflected light 312b, and a branch of is transmitted light 332b, wherein transmitted light 332b The absorbed layer 303b for being arranged at prism array rear absorbs.

In the present embodiment, the first filter coating and the second filter coating are that input light 321b is divided into two parts according to wavelength , the reflectivity of the first filter coating and the second filter coating with wavelength change curve as shown in Figure 3 d.It is shown in solid in Fig. 3 d Broken line is the first filter coating 304b reflectivity changes curve, and it includes three high reflectivity regions 304b-B（Corresponding to blueness SPECTRAL REGION）、304b-G（Corresponding to green spectral region）、304b-R（Corresponding to red spectral region）；Folding shown in dotted line Line is the second filter coating 305b reflectivity changes curve, and it includes three high reflectivity regions 305b-B（Corresponding to blue light Compose region）、305b-G（Corresponding to green spectral region）、305b-R（Corresponding to red spectral region）；The three of first filter coating Individual high reflectivity regions and three high reflectivity regions of the second filter coating intersect on wavelength.At this point it is possible to throwing is set Shadow light source 351 causes input light 321b to carry two images simultaneously, and the first image is right with 304b-B, 304b-G and 304b-R institute Three spectrum segments answered as three primary colours, the second image using three spectrum segments corresponding to 305b-B, 305b-G and 305b-R as Three primary colours.Such first image will be reflected into the first output light by the first filter coating 304b of prism 302b first surface 311b, the second image then can be reflected into the second output light 312b by the second filter coating 305b of prism 302b second surface.

Two images entrained by the input light of projection light source, can be emitted simultaneously or timesharing be emitted. This is all prior art, only illustrates its implementation herein.The situation that two images are emitted simultaneously is, first according to input Two picture signals produce two image lights respectively, recycle the spectrum of two image lights is different to be combined light into using optical filter For a branch of outgoing.Another situation that another image is emitted simultaneously is first to produce two respectively according to two picture signals of input Individual image light, two image lights are projected to screen by neighbouring camera lens respectively, two such image light due to relatively close to It is approximately a branch of.The situation of two image timesharing outgoing can be used in projection light source comprising two groups of three primary colours in Fig. 3 d Colour wheel carry out two groups of primary lights of generation of timesharing, light valve is carried out respectively according to two picture signals of input to this two groups of primary lights Synchronous modulation is to produce two image lights of timesharing outgoing.

Fig. 3 e are the structural representation in 301a regions to the right on screen in Fig. 3 a.With the 301b regions represented by Fig. 3 c not It is same, two prism unit 302a are included in the prism array in Fig. 3 e, the two prism units have a surface quilt respectively Input light 321a irradiates, and the two surfaces are surface 304a and surface 305a respectively, and the two illuminated normals to a surface Direction is different.So plate the first filter coating 304a and the second filter coating 305a on both surfaces respectively, it is possible to will input Light is divided into the output light 311a and 312a of two different wavelength ranges and projected to different directions.It is appreciated that in Fig. 3 e The main distinction point of screen construction and the screen construction in Fig. 3 c is, make use of two surfaces of same prism will in Fig. 3 c Input light is decomposed into two beams, i.e. the first input light and the second input light, and it is the first output light 311b that it is reflected into projection respectively With the second output light 312b；And each surfaces of two prisms is make use of in Fig. 3 e to reach identical purpose.

What Fig. 3 e were represented is the structural representation in 301a regions to the right on screen in Fig. 3 a, wherein due to input light 321a It is incident from left side, therefore the first filter coating 304a and the second filter coating 305a are plated in the left side of two prism units respectively To meet to incident light on surface；It is appreciated that for region to the left on screen, then because input light will be incident from right side, Then the first filter coating and the second filter coating are plated on the surface on the right side of corresponding two prism units to meet to incident light.For Repeat specification is not done in region to the left on screen.In embodiment below, entered by the middle part of screen and exemplified by right side area Row explanation, and then corresponding derivation can be done according to the structure on right side on the left of screen.

It is readily appreciated that, in the screen of the present embodiment, central region 301b and fringe region 301a structure is not Together, this is in the middle part of screen in the lateral direction mainly due to projection light source 351, causes to be incident in region 301b and region The incident angle difference of 301a input light is very big.Might not then there is such limitation in actual applications.Such as work as projection Light source is located at the left side of screen, then for whole screen ranges the light of each position be it is incident from left side, now this Art personnel easily design the structure on screen on each region according to Fig. 3 e description, now may not then use figure Structure shown in 3c.

What deserves to be explained is in actual applications, the position of the first filter coating and the second filter coating is also not necessarily in prism Towards prism on the face of input light incident direction, can also be located at towards on the face of absorbed layer.Moreover, the first filter coating and Two filter coatings can be the filter coating of absorption-type in itself, and thus the function of absorbed layer is integrated on filter coating, now absorbed Layer can omit.

Because input light is to be projected to from projection light source on screen, therefore it is incident in the input of any position A on screen The input cone angle of light is all very small（The solid angle of the cone angle is equal to the projection lens bore and projection lens to position of projection light source A ratio of distances constant）, therefore in the present embodiment, output light can be accurately controlled by the prism unit designed on screen Exit direction.This is the essential reason that the present invention has excellent effect.

In addition to Fig. 3 c, Fig. 3 f are another structural representations in middle part 301b regions on screen in Fig. 3 a.In the structure In, input light 321b is incident in a prism array first（A prism 307b is only drawn in figure to illustrate）.In the present embodiment In, prism 307b's has beam splitter layer 308b on the face of input light incident direction（Beam splitter layer may be straight in actual applications Connect and be plated on prism surface）, incident light can be divided into two beams of transmission and reflection according to the different of wavelength.Difference in prism array Beam splitter layer on prism also forms a beam splitter layer array, and in the present embodiment, beam splitter layer array is all in approximately the same plane And attribute is identical, therefore beam splitter layer array should form the beam splitter layer of an entirety.Input light 321b passes through prism 307b refraction After deflect and be incident in beam splitter layer 308b, layer light beam for 308b reflections that be split goes out after again passing by prism 307b refractions Penetrate to form the first output light 311b, and it is a branch of through beam splitter layer 308b transmissions, it is incident in positioned at beam splitter layer 308b light paths rear end Reflecting layer 309b, beam splitter layer 308b is transmitted again after reflection layer surface is reflected, and be emitted after prism 307b refraction Form the second output light 312b.Because transmitted light is different with the light path of reflected light on beam splitter layer 308b, therefore distinguished by them The the first output light 311b and the second output light 312b exit direction formed is different.Specifically, by controlling prism 307b shape can control the first output light 311b exit direction, further by controlling reflecting layer 304b to control The second output light 312b direction is made, has thus reached the purpose of two output light directions of control.

In the present embodiment, reflecting layer 309b is reflector element array, and each reflector element is serrated in the horizontal direction, And the drift angle of the sawtooth in the horizontal direction is 90 degree, so according to knowable to geometric knowledge its incident light can be reached by it along original The effect of direction reflection.The drift angle of actually sawtooth may not be 90 degree, control the angle to reach control reflected light side To purpose.The method for realizing reflecting layer in addition is also a lot, such as directly uses and plate metal on the substrate for having certain structure The mode of film or dielectric film, the direction of reflected light is controlled by the shape of control structure, then for example using glass microballoon Array reaches the purpose for making incident light be reflected along former direction.

Fig. 3 g illustrate the reflectivity of beam splitter layer 308b in Fig. 3 f with the change of wavelength.Include three high reflectances in figure Region 308b-rB（Corresponding to blue spectral region）、308b-rG（Corresponding to green spectral region）And 308b-rR（Corresponding to red Color spectrum region）, include three high-transmission rate region 308b-tB in the crack of these three high reflectivity regions（Corresponding to indigo plant Color spectrum region）、308b-tG（Corresponding to green spectral region）And 308b-tR（Corresponding to red spectral region）.It can manage Solution, the two-beam being divided by beam splitter layer 308b, a branch of spectral color corresponding to these three high reflectivity regions of reflection For three primary colours, transmission it is a branch of then using the spectral color corresponding to three high-transmission rate regions as three primary colours.As long as so set Projection light source 351 causes input light 321b to carry two images simultaneously, and an image is with 308b-rB, 308b-rG and 308b- Three spectrum segments corresponding to rR are as three primary colours, and another image is with three corresponding to 308b-tB, 308b-tG and 308b-tR Individual spectrum segment is three primary colours.So the two images will be divided into two beams in inside screen, i.e. the first input light and second defeated Enter light, and be reflected to different directions respectively and form the first output light 311b（311a）With the second output light 312b（311a）. Two images entrained by the input light of projection light source, can be emitted simultaneously or timesharing be emitted, be not limited System.

Fig. 3 h and Fig. 3 i are a kind of deformations of structure shown in Fig. 3 f, and Fig. 3 h structure is applied to the intermediate region of screen 301 301b, Fig. 3 i structure are applied to the region 301a to the right of screen 301.

In the structure shown in Fig. 3 h, beam splitter layer 308b be plated in prism 307b towards input light direction face on, input Light 321b is divided into two beams after being incident in beam splitter layer 308b, and reflecting part forms output light 311b, and transmissive portion passes through prism 307b Reflected afterwards by reflecting layer 309b, and form output light 312b after optical prism 307b and beam splitter layer 308b again.The structure and figure Structure shown in 3f is simply varied from part order, and the shape in reflecting layer is different, those skilled in the art according to Description oneself can design, therefore belong to protection scope of the present invention.In the present embodiment, each prism on prism array On beam splitter layer form an array, these beam splitter layers are inevitable not in approximately the same plane, can not form point of an entirety Photosphere.

In the structure shown in Fig. 3 i, reflecting layer 309a is reflector element array, and it is single that a reflection is wherein only drawn in figure First 309a, reflector element 309a are serrated.Input light 321a incides the beam splitter layer on prism 307a surfaces from left direction 308a, the corresponding prism 307a that adjusts is shaped such that reflected beam portion 311a exit direction is controlled, while transmissive portions Lease making crosses reflector element array 309a primary event, then outgoing forms output light 312a after prism 307a refraction.Than Difference compared with Fig. 3 i and Fig. 3 h is appreciated that those skilled in the art can be according to foregoing description, for the diverse location of screen Different designs is carried out to realize the control to the exit direction of output light.

In the examples above, the first filter coating, the second filter coating and beam splitter layer are all according to the different of wavelength and to light Filtered or be divided.In actual applications, light can also be filtered or is divided according to the difference of polarization state.For example, In structure shown in Fig. 3 c and Fig. 3 e, the first filter coating can reflect the polarization state light in A directions, transmit or absorb the inclined of B directions Polarization state light, and the second filter coating can reflect the polarization state light in B directions, transmission or absorption A polarization state lights, A directions and B directions phase It is mutually vertical.For another example in the structure shown in Fig. 3 f, Fig. 3 h and Fig. 3 i, beam splitter layer can reflect A directions polarization state light simultaneously B directions polarization state light is transmitted, A directions and B directions are mutually perpendicular to.So, as long as setting projection light source to cause input light while take Two images of band, an image be with entrained by the polarization state light of A directions, another image with entrained by the polarization state light of B directions, this The two images of sample will be divided into two beams in inside screen and be reflected to respectively different direction formed the first output light and Second output light.Two images entrained by the input light of projection light source, can be emitted simultaneously or timesharing outgoing , it is not restricted by.

A prism unit, a light splitting layer unit and one are only depicted in structure shown in Fig. 3 f to Fig. 3 i, in figure Reflector element, it is probably then the prism array of multiple prisms compositions and the reflective array being made up of multiple reflector elements in practical application Row.Prism unit and reflector element are not necessarily one-to-one, and transmit the transmitted light of a prism unit by anti- Another prism unit may be incident in after penetrating unit reflection.In addition, reflecting layer is also likely to be to be combined as a whole with prism.Cause This, the light path design that Fig. 3 f to Fig. 3 i are done is served only for for example, not being construed as limiting.

It is emphasized that compared with the structure shown in Fig. 3 c to Fig. 3 e, the efficiency of the structure shown in Fig. 3 f to Fig. 3 i is more It is high.Because the former has part light to be predominantly absorbed, and the input light of the latter is divided into two beams, and this two-beam is all utilized.

Embodiment shown in complex chart 3a to Fig. 3 i can be seen that screen 301 will be defeated according to the difference of particular optical attribute Enter light and be divided into two beams, the first input light and the second input light, and the first input light is projected to form the first output light, and second is defeated Enter light to be projected to form the second output light, two beam output lights carry different images and shooting angle is different.Wherein particular optical Attribute includes but is not limited to wavelength and polarization state.Utilize the design to screen, it is possible to achieve to the angles of two beam output lights Accurate control.

In the embodiment shown in Fig. 3 a to Fig. 3 i, screen is all reflection-type, i.e. observer and projection light source is in screen Homonymy.In fact, screen can also be transmission-type, i.e. observer and projection light source is in the relative both sides of screen.Such as figure Shown in 4a, light that projection light source 451 is sent（In figure by taking light 421b as an example）, after the transmission of screen 401, form the output of two beams Light（In figure by taking light 411b and 412b as an example）And project toward different directions.

Fig. 4 b are the structural representation in 401b regions on screen in Fig. 4 a.Input light 421b is incident in prism array（In figure A prism 402b is only drawn to illustrate）, and two surfaces of each prism are incident in, two surfaces have different normals Direction, and different filter coatings is coated with respectively, the first filter coating 404b and the second filter coating 405b.Input light 421b is by the first filter After light film 404b filterings, some light transmission prism surface simultaneously forms output light 411b by refraction by prism, and reflected light 431b then reflects Backing up shadow light source direction.After input light 421b is filtered by the second filter coating 405b, some light transmission prism surface is simultaneously rolled over by prism Penetrate to form output light 412b, reflected light 432b is then reflected back projection light source direction.Now, as long as the input light of projection light source projection Carry two different images, the spectrum of primary lights used in two images respectively with the first filter coating and the second filter coating Transmission spectrum it is corresponding, it becomes possible to realize that the output light of different images projects different directions.

Compare Fig. 3 c and be appreciated that both principles are similar with Fig. 4 b, differ only in Fig. 3 c structure as reflection-type and Fig. 4 b structures are transmission-type, therefore Fig. 3 d ordinate is changed into " transmitance " can and represents that the first filter coating and second filters The transmitance of film and the relation of wavelength.In actual applications, the deformation of these Fig. 3 c structures of Fig. 3 e, Fig. 3 f, Fig. 3 h, Fig. 3 i, all Can be accordingly applied in the design of transmission-type, here is omitted.

In the above-described embodiments, input light only is produced using a projection light source, the input light is according to wavelength or polarization state Different Deng optical properties carry two different images, and the two images are on screen further according to optics such as wavelength or polarization states The difference of attribute is subsequently divided to form the first input light and the second input light, and is projected respectively via the different light path of inside screen For exit direction different the first output light and the second output light.In fact, two projection light sources can also be used from different Position produces the first input light and the second input light respectively, and the first input light and the second input light carry different images respectively （As shown in example below）.Wherein, the first input light is projected to form the first output light by screen, and the second input light is by screen Projection forms the second output light.If the contact in the two image existence times, such as the two images correspond respectively to people's Left-eye image and eye image thus need the first input light of two projection light source output of control for realizing 3D effect Synchronized with the second input light.If two images are uncorrelated, without Synchronization Control.

The top view of the projection display system of an alternative embodiment of the invention is as shown in Figure 5 a.The projection display system bag Include two projection light sources, the first projection light source 551 and the second projection light source 552 respectively positioned at screen 501 in the lateral direction Both sides, the first input light that the first projection light source 551 is sent（Two light 521a and 521b are only drawn in figure to illustrate）From a left side Side is projected on screen 501, the second input light that the second projection light source 552 is sent（Only drawn in figure two light 522a and 522b is to illustrate）Projected from right side on screen 501.Light 521a and light 522a is incident in the right side area on screen 501a, light 521b and light 522b are incident in the central region 501b on screen.Right side area 501a is by the first input light 521a reflects to form the first output light 511a, while the second input light 522a is reflected to form into the second output light 512a, and first is defeated Light extraction 511a and the second output light 512a direction are different.Similar, central region 501b is by the first input light 521b reflections Into the first output light 511b, at the same by the second input light 522b reflect to form the second output light 512b, the first output light 511b and Second output light 512b direction is different.First output light 511a and 511b shoots to identical direction and observed person sees, this Observer of the sample in this orientation can just see that incoming first output light of diverse location is secondary to form one on screen simultaneously Complete image；As a same reason, the observer in the second output light 512a and 512b exit direction can also be seen that screen Upper incoming second output light of diverse location is to form a secondary complete image.

In actual applications, in order to meet the specific demand including 3D display, the projection display system is also possible to wrap Include image synchronization control device（It is not drawn into figure）, for controlling the first projection light source 551 and the second projection light source 552 so that The image that first input light and the second input light are carried is mutually in step.

Fig. 5 b to Fig. 5 e show a kind of citing of the structure of screen 501, are illustrated with reference to this few width figure.Fig. 5 b It is the front view of system shown in Fig. 5 a.Include microstructured layers on screen, the microstructured layers are prism array in the present embodiment.Rib Each prism is included towards two surfaces of input light, first micro- face and second micro- face in lens array.First micro- face and Have reflecting layer on two micro- faces, be probably specifically the metallic reflector or medium on the first micro- face that is plated on and second micro- face surface Reflecting layer.Fig. 5 c are the upward view of screen 501.What deserves to be explained is the prism array in Fig. 5 b and Fig. 5 c does not represent truly Size and ratio, the prism in practical application in prism array is more much smaller than shown in figure relative to the size of screen；This In for convenience of description thus amplification display.

Fig. 5 d show the operation principle in 501b regions on screen.It is the top view of a prism, the prism facets in Fig. 5 d It is first micro- micro- face 505b of face 504b and second to two surfaces of input light, first micro- micro- face 505b surfaces of face 504b and second It is attached with or plated with reflectance coating.First micro- face 504b is received and is projected the first input light 521b as the towards the first input light 521b For one output light 511b, second micro- face 505b towards the second input light 522b, it is second defeated to receive and project the second input light 522b Light extraction 512b.So, by controlling the normal direction of the shape of prism, i.e. first micro- micro- face 505b of face 504b and second of control, Can is accurately controlled the first output light 511b and the second output light 512b exit direction.It is also worth noting that the One micro- face 504b is not towards the second input light 522b while towards the first input light 521b, and such second input light 522b is just It will not be irradiated on first micro- face 504b；As a same reason, second micro- face 505b not faces while towards the second input light 522b To the first input light 521b, the first input light 521b will not be also irradiated on second micro- face 505b, can so make the first output Crosstalk minimization between light and the second output light.In fact, even if there is the input light of small part first to be incident in second micro- face Situation occurs, and because the normal direction in second micro- face is improper, this input light of part first will not be still projected toward the second output The exit direction of light and form crosstalk.

Fig. 5 e then show the operation principle in 501a regions to the right on screen 501.Prism is depicted in Fig. 5 e Top view, the prism are the first micro- micro- face 505a of face 504a and second for being coated with reflectance coating towards two surfaces of input light.The It is that the first output light 511a, second micro- face 505a is used for reception simultaneously that one micro- face 504a, which is used to receiving and projecting the first input light 521a, It is the second output light 512a to project the second input light 522a.It is slightly different with the prism in Fig. 5 d, due to region 501a's Position is different from region 501b position, therefore the angle of incident light is different, thus needs to adjust the shape of prism, that is, adjusts First micro- face and the normal direction in second micro- face so that control the first output light 511a and the second output light 512a outgoing side To.Specifically, region 501a is on the right side of screen, so compared to region 501b, the incident direction and screen of the first input light The angle of curtain is smaller（I.e. closer to the direction parallel to screen）, and the angle of the incident direction of the second input light and screen is more Greatly（I.e. closer to the direction of vertical screen）, therefore in order to realize that first of reflection in the middle part of the first output light 511a and screen is defeated Light extraction 511b has roughly the same exit direction, and the second output light 512a and the second output light 512b of reflection in the middle part of screen have greatly Identical exit direction is caused, the prism in Fig. 5 e compares prism centers in Fig. 5 d more to left avertence.

According to above mentality of designing, those skilled in the art can design the prism shape on whole screen diverse location Shape, do not repeat herein.

In the system shown in Fig. 5 b to Fig. 5 e, microstructured layers are the prism battle array vertically extended arranged in parallel Row.If actually the first projection light source and the second projection light source are respectively placed in above and below screen, microstructured layers It may be horizontally extending prism array arranged in parallel.Therefore bearing of trend and projection of the present invention for prism The orientation of putting of light source is not limited.In addition, though prism all protrudes from screen body in Fig. 5 b to Fig. 5 e, still It can also actually be sunken（It is sunken also referred to as prism）, being sunken two formed micro- faces can equally rise To the effect for reflecting the first input light and the second input light respectively.

In Fig. 5 b into the screen construction shown in 5e, its shortcoming is light control of the screen on upper and lower angle direction not It is good, such as the region on screen top, reflect the shooting angle of the reflected light formed from the input light lower than the regional location Can be on the upper side.This can be solved using scattering layer.Scattering layer can be positioned in front of screen（I.e. input light is incident in scattering first Then layer is re-shoot in screen）, it is also possible to a part for screen, such as form scattering particles layer, then example in micro-structure surface Such as by micro-structure surface feather plucking.In the present embodiment, micro-structural is towards input light, and micro-structural may also be backwards in practical application Input light（With reference to figure 6d）, i.e. input light must can just be incident in micro-structure surface after first transmissive viewing screen body, now scattering layer It is also likely to be the scattering particles for being incorporated into screen body interior.And astigmatism is simultaneously in left and right on upper and lower angle direction in order to realize Direction controlling on angle direction, it is preferred that scattering layer is less than in upper and lower angle direction in the scattering angle of left and right angle direction Scattering angle.Such as scattering angle very little of the scattering layer on the angle direction of left and right, it is 3 ~ 5 degree, while in upper lower angle side Upward scattering angle is 20 ~ 50 degree.This scattering layer is prior art, such as forms left and right directions on surface（Horizontal direction） Micro- cylindrical structure of extension, these micro- cylindrical structures can be arranged with array, spuious can also arranged；Again for example in screen body Incorporation is in left-right direction（Horizontal direction）The micro cylinder of extension, similar effect can also be reached.Moreover, screen top is with The micro- cylindrical structure or micro cylinder in portion may be different, to control diverse location on screen above-below direction to have different scattering sides To.As for the control method to scattering degree, also include in existing scattering technology, do not repeated herein.It is appreciated that this The scattering technology and methods for using them of place description is equally applicable to other embodiments of the invention.

The bad method of angle direction glazing line traffic control is above and below screen construction shown in another kind solution Fig. 5 b to Fig. 5 e Screen construction is improved, as shown in figure 5f.Fig. 5 f are the front view of another screen construction, the micro-structural in microstructured layers in figure With the difference shown in Fig. 5 b.In the screen of the embodiment shown in Fig. 5 f, it is in irregular shape micro- that microstructured layers include several Structure, wherein 4 are depicted in figure（Still do not drawn for convenience with former ratio, actual micro-structural is much smaller）, micro-structural 5011st, 5014,5017 and 5018.Illustrate the operation principle of each micro-structural by taking micro-structural 5011 as an example first.

Fig. 5 g are the schematic perspective views of micro-structural 5011, and the surface of micro-structural 5011 includes two micro- faces, first micro- face 5012 With second micro- face 5013, the two micro- faces are represented with the intersection of the two faces and screen body in Fig. 5 f.In Fig. 5 g, First micro- face 5012 is generally positive towards the first projection light source 551, and its intersection with screen body is with the first projection light source 551 Light-emitting window for the center of circle circle on.The problem of bad to light control in the vertical direction is thus effectively prevent, first is micro- First input light 521 can be reflected into the first output light 511 by face 5012, and the direction of the first output light 511 is in upper lower angle All it is controllable on direction and left and right angle direction.Same reason, second micro- face 5013 are used to reflect the second input light 522 For the second output light 512, second micro- face 5013 is generally positive towards the second projection light source 552, and its curve form is used to controlling the The exit direction of two output lights 512.Second micro- face 5013 is slightly different with first micro- face 5012, second micro- face 5013 and screen The intersection of curtain body is straightway rather than curved section, this straightway and the circle phase centered on the light-emitting window of the second projection light source Cut.Because straightway is shorter, so its effect is close with curved section, but its processing get up it is much easier.Further, first Micro- face and the intersection of screen body can also be approximately straight line section, and so whole micro-structural 5011 is exactly a pyramid knot Structure, difficulty of processing are smaller.In fact, the top of micro-structural 5011 may not be pinnacle but a line or a flat-top. The deformation present invention to these micro-structurals is not limited.

As can be seen that for micro-structural 5011, first micro- face 5012 is towards the first projection light source without being projected towards second Light source, and second micro- face 5013 towards the second projection light source without towards the first projection light source.And other the two of micro-structural 5011 The design principle in individual face is preferably, as far as possible not towards the first projection light source and the second projection light source, i.e., as far as possible few by first Input light and the second input light are irradiated to.Therefore the two faces are just designed to along the light-emitting window from the first projection light source Radioactive ray direction extension, or along the light-emitting window from the second projection light source radioactive ray direction extend.Can from Fig. 5 f To find out, for micro-structural 5011, it is along from first positioned at micro- face of first micro- micro- lower section of face 5013 in face 5012 and second The extension of radioactive ray direction that the light-emitting window of projection light source 551 sets out, and micro-structural 5011 positioned at first micro- face 5012 and the Micro- face of two micro- tops of face 5013, is extended along the radioactive ray of the light-emitting window from the second projection light source 552.For this For two micro- faces, it is mapped to even if being transfused to illumination, because normal direction is improper, so the crosstalk of image can't be caused, But veiling glare can be formed, reduce the efficiency of screen.Compared with Fig. 5 d and Fig. 5 e micro-structural, due to the micro-structural in Fig. 5 g Design is not limited to extend along some specific direction, therefore the micro-structural in Fig. 5 g has bigger design freedom, more The trend of output light can be accurately controlled（Left and right angle direction and upper and lower angle direction）.

The arrangement mode of micro-structural is illustrated with micro-structural 5014,5017 and 5018 below.Micro-structural 5014 includes First micro- 5015 and second micro- face 5016 of face, respectively just towards the first projection light source 551 and the second projection light source 552.Its structure Design method is identical with micro-structural 5011, does not do repeat specification.Micro-structural 5017 and 5018 side by side positioned at micro-structural 5014 Lower section.As can be seen that in order to meet first micro- face and second micro- face respectively just towards the first projection light source 551 and the second projected light It the condition in source 552, can not completely connect between micro-structural 5014,5017 and 5018, but a white space be present, This is different from the structure shown in Fig. 5 b.It is appreciated that as long as micro-structural is sufficiently small, this white space is with regard to sufficiently small.

Unlike the embodiment shown in Fig. 5 a, in another embodiment shown in Fig. 6 a, the first projection light source 651 With the second projection light source 652 both sides that to be no longer at screen relative, but it is located at the downside of screen simultaneously, and in the lateral direction Pull open certain distance（With reference to figure 6b）.Screen 651 so be again may be by realize to the first input light and the second input light Project respectively to form the purpose of the first output light of different exit directions and the second output light.Done with reference to Fig. 6 b specific Explanation.

In figure 6b, multiple micro-structurals are included on screen 601, only drawn in figure wherein 4 micro-structurals 6011,6014, 6015 and 6016.Illustrate its method of work by taking micro-structural 6011 as an example first.Similar in the embodiment shown in Fig. 5 g, micro-structural 6011 be raised micro-structural, and micro- facing to screen lower section, first micro- 6012 positive direction of face including three micro- faces, two of which First projection light source 651, second micro- face 6013 is just towards the second projection light source 652.First micro- face and second micro- face in figure 6b Represented with the intersection of the two faces and screen body.First input light 621 is incident in first micro- face, micro- by control first The normal direction in face 6012, the direction of reflected light can be controlled, that is, control the exit direction of the first output light 611.Likewise, the Two input lights 622 are incident in second micro- face, by controlling the normal direction in second micro- face 6013, can control the side of reflected light To controlling the exit direction of the second output light 612.

Because the first projection light source and the second projection light source are all located at the lower section of screen rather than relative, therefore in screen Some upper positions, first micro- face of micro-structural by part towards the second projection light source, or micro-structural second micro- face by part Towards the first projection light source.In the present invention, face X " towards " object Y, the radioactive ray at least one sent from Y are referred to It can fall on the X of face, face X " not towards " object Y, the radioactive ray for referring to sending from Y can not fall on the X of face completely.Such as at this In embodiment, the first input light 623 sent from the first projection light source is incident on second micro- face 6013, and is reflected as spuious Light 613.Which results in the decline of screen efficiency, but the direction of the exit direction due to light 613 and the second output light 612 is not Together, therefore the crosstalk that can't be formed between two images.

The arrangement mode in the present embodiment between micro-structural is illustrated with micro-structural 6014,6015 and 6016 below.It is preferred that , two groups of concentric circles can be drawn using the light-emitting window of the first projection light source and the light-emitting window of the second projection light source as the center of circle respectively, two Screen partition is fritter by group concentric circles, is filled a micro-structural in each fritter, can thus be met each micro-structural All there are two difference just towards the first projection light source and first micro- face of the second projection light source and the condition in second micro- face.Thus It can be seen that in the present embodiment, micro-structural is probably the triangular pyramid or three prismatic table shapes as drawn in Fig. 6 b, but is also not limited to this, because Structure for the first half of each micro-structural is not limited（The first half of each micro-structural is blank in Fig. 6 b）, institute The fritter being divided into by two groups of concentric circles can also be filled up with the profile of each micro-structural, as long as not influenceing first micro- face and second The angle in micro- face.

Fig. 6 c and Fig. 6 d show two kinds of citings of the side view of screen in the present embodiment.In fig. 6 c, micro-structural aspect To input light 621 and 622, input light directly reflects to form output light 611 and 612 by microstructured layers.By controlling microstructured layers The form of middle micro-structural, shooting angle of the output light on vertically and horizontally can be controlled.Fig. 6 d are then another Citing, in this example embodiment, microstructured layers reenter after input light 621 and 622, the input light body of transmissive viewing screen 601 first Penetrate in the surface of microstructured layers, and reflected to form and project light 611 and 612.It is appreciated that in Fig. 5 a to Fig. 5 g embodiment In, microstructured layers equally can be backwards to input light.

In the embodiment shown in Fig. 5 a to Fig. 6 d, screen is reflection-type, and the screen of transmission-type is illustrated with reference to Fig. 7 The concrete mode that curtain is used in combination with two projection light sources.As shown in fig. 7, the first projection light source 751 and the second projection light source 752 It is located at the both sides of screen 701 with observer.Screen 701 has the structure of Fresnel Lenses, and the first projection light source 751 is located at screen Center position to the right, the first input light 721 that it sends form the first output light 711 after screen 701 transmits and converges And towards the observer in left side；Second projection light source 752 is located at screen center position to the left, the second input light that it sends 722 after screen 701 transmits and converges, and forms the second output light 712 and towards the observer on right side.In the present embodiment, Input light is converged and transmitted using the structure of the Fresnel Lenses of screen 701, and it is defeated using the first input light and second Enter the incident direction difference of light to form the first output light of different exit directions and the second output light.

Above from Fig. 3 a to Fig. 7, pass through the embodiment of different projection display systems and screen construction, it is described how control The direction of the launch of first output light and the second output light, and how accurately to control the side in the direction of each light in output light Method.Meanwhile Fig. 1 and Fig. 2 then respectively describe can be realized using these projection display systems and screen construction two kind first The light distribution and its practical application of output light and the second output light.In fact, except light distribution and reality shown in Fig. 1 and Fig. 2 Using outer, using these projection display systems and screen construction, the distribution of other output lights can also be realized, and realize other Practical application.Fig. 8 a, Fig. 8 b, shown in Fig. 8 c and Figure 11 it is exactly other four kinds of citings.

As shown in Figure 8 a, in this embodiment, the first output light being emitted from any point on screen 801 and the second output Light all has an identical light distribution, therefore only illustrates using exemplified by the central point of screen 801.In the citing shown in Fig. 1 and Fig. 2 In, the light that any point is sent on screen all has a specific direction, and in this citing, the output at any point on screen Light all has a specific direction scope rather than just a specific direction.Such as shown in Figure 8 a, the first output light For the light beam with light 811 and 813 for rim ray, the second output light is the light beam with light 812 and 814 for rim ray. Three regions in horizontal view angle scope now at least be present, i.e., the region L with light 811 and light 812 for rim ray, with Light 812 and the region M that light 813 is rim ray, and the region N with light 813 and light 814 for rim ray.Can be with Understand, the observer in the L of region can see the first output light and can't see the region of the second output light, the observer in the N of region The second output light can be seen and can't see the region of the first output light, and the observer in the M of region can then see that first is defeated simultaneously The region of light extraction and the second output light.Therefore, observer can watch the image that the first projection light source sends in region L, in area Domain N can watch the image that the second projection light source is sent；And in region M, observer can see above two images simultaneously, therefore And direct viewing can form crosstalk.Therefore 3D glasses can be worn in region M, observer, the 3D glasses or so two eyeglasses point It is other that light is filtered.Such as left eyeglass filters out the second output light and remaining first output light transmission, then right eyeglass filters out First output light and remaining second output light transmission；Or in turn, left eyeglass filters out the first output light and remaining second defeated Go out light transmission, then right eyeglass filters out the second output light and remaining first output light transmission.In a word, left eyeglass should filter out the right side Eye corresponding to image and only make image transmission corresponding to left eye, right eyeglass should filter out the image corresponding to left eye and only make Image transmission corresponding to right eye.

In current 3D display device, 2D images and 3D rendering can be selected and switched, but can not possibly be shown simultaneously. This brings following problem：(1) 3D glasses are typically somewhat expensive, and more people may cause glasses not enough when watching simultaneously；(2) Not all people is accustomed to wearing 3D glasses；(3) also without the visual security for proving 3D images for children.Fig. 8 a institutes The embodiment shown successfully makes 3D rendering and common 2D images while shown on one piece of screen：Standing can see in region L and N 2D images are seen, 3D rendering can then be watched in region M by standing.This display methods obviously will bring brand-new adventure in daily life.

In the example shown in Fig. 8 a, still have to watch using 3D glasses in the M of region, and 3D glasses bodies are very not Easily, and 3D glasses also increase extra cost.Then avoided using 3D glasses in the example shown in Fig. 8 b.With screen Exemplified by the region 801c in the left side on curtain.The first output light being emitted from screen area 801c is with light 815 and light 816 Rim ray, the second output light being emitted from screen area 801c is with light 817 and light 818 for rim ray.It can see Go out the first output light and the second output light is not overlapping.If in the presence of the observer K that one to screen is certain distance, its left eye exists 843a is expressed as in figure, its right eye then designs light 816 and be incident in left eye 843a, while design light shown in FIG as 843b Line 817 is incident in right eye 843b.For the other positions on screen, also designed according to identical principle, i.e. the first output light and Second output light is not overlapping, and close to each other two rim rays are incident in left eye 843a and right eye 843b respectively.So For observer K, its left eye 843a is it can be seen that first output light at any point is just looked at less than the second output on screen Light, right eye 843b is then it can be seen that second output light at any point is just looked at less than the first output light on screen, as long as therefore matching somebody with somebody Close projection light source and carry out suitable set so that the image entrained by the first output light corresponds to left eye the second output light institute simultaneously The image of carrying corresponds to right eye, then what observer K saw is exactly 3D effect image.

At the same time, observer 841 and observer 842 can only see the first output light and of every bit on screen respectively Two output lights, thus it is seen that 2D images.

Fig. 8 c are then the deformation of Fig. 8 b example.In Fig. 8 b citing, the first output light of every bit and on screen A gap between two output lights be present, the first output light had both been can't see in this gap or can't see the second output light.Example As being exactly between the first output light rim ray 816 and the second output light rim ray 817 on screen area 801c Gap.This has a problem that in actual applications, is exactly that this system is very high for observer K status requirement, deviates one Point cannot normally see 3D.Such as observer K is to the left, then its left eye remains able to see the first output light, but its right eye Just fall in gap and can't see the second output light.Likewise, this also proposes very high requirement to the machining accuracy of screen. More optimize, be that as shown in Figure 8 c, the rim ray 817 of the output light of rim ray 816 and second of the first output light is more It is close, simultaneously close to the place between the eyebrows position between two of observer K.Such first output light equally covers left eye 843a, the second output light equally covers right eye 843b, therefore observer K 3D visual effects are constant, but so right All it is greatly lowered in the requirement of observer K status requirement, and the machining accuracy of screen, i.e., System Error-tolerance Property improves. Certainly, the rim ray 817 of the output light of rim ray 816 and second of the first output light can overlap, now System Error-tolerance Property It is best.

The light distribution of output light shown in Fig. 8 a to Fig. 8 c, unlike shown in Fig. 1 and Fig. 2, for every on screen The output light of one position is no longer the light of a specific direction, but a light beam with certain angle scope.But In Fig. 3 a into the explanation of the embodiment shown in Fig. 7, both for the exit direction for how controlling output light, i.e., how to realize The output light of the light of one specific direction, this it is of course possible to meet a kind of output light distribution representated by Fig. 1 and Fig. 2, but It is the light distribution that but can not directly realize the output light shown in Fig. 8 a to Fig. 8 c.

In fact, having been able to control output light to be emitted along specific direction（That is multiple skills representated by Fig. 3 a to Fig. 7 Art scheme）Technical foundation on, be easily to realize that output light has the requirement of special angle scope.Such as use scattering Layer, the scattering layer can be positioned over light and any position in screen effect light path, can also be combined as a whole with screen, it is tied Conjunction mode is above having been described and illustrated.The effect of the scattering layer is the light of specific direction being scattering into former specific Scattered beam centered on direction, it acts on as shown in Figure 9.Fig. 9 is the relation signal of the front and rear light intensity of light scattering and angle Figure, wherein curve 911 is sharp, and it represents the light along specific direction, and the light is after certain scattering Curve is 912, it is seen that being taken for a light beam propagated centered on former radiation direction, its angular range representated by 912 It is certainly bigger in the degree of scattering, more severe then angular range of scattering.As can be seen here, by controlling output light along specific direction Outgoing, along with the scattering degree of control scattering layer（Such as the ginseng such as refractive index, concentration and granularity by controlling scattering particles Number）, it is possible to control the exiting angle range of final output light.

The method of the exiting angle range of output light is controlled by being scattered to the light that specific direction transmits, is existed One problem.Such as the light distribution curve 912 after the scattering in Fig. 9, its angular range is controllable, but in this scope Introversion line morphology（That is light distribution）Control be relatively difficult.Such as light distribution 912, present after significantly scattering Light distribution feature, i.e. bell-shaped profile.There is long hangover 912a on two borders of the distribution.Want to realize that edge is precipitous Light distribution, be difficult to using the method typically scattered.

A kind of solution method be light is scattered using micro- cylindrical lens array or microlens array can obtain it is specific The scattering of light distribution, the light distribution are relevant with the face type design of micro- cylindrical mirror or lenticule.This is prior art, herein not Do excessive introduction.

Illustrate another method for realizing certain output light exiting angle range with reference to Figure 10 a to Figure 10 c.Look back The method that emergent light angle is controlled in Fig. 5 e, wherein the normal direction by controlling first micro- micro- face 504b of face 504a and second, The first emergent light 511a and the second emergent light 512a exit direction can be controlled.Figure 10 a to Figure 10 c be then to using Fig. 5 e as Three citings that prototype is improved.

In figure loa, the triangular representation of dotted line is micro-structural in Fig. 5 e, wherein lines 504a and 504b difference tables Show the transversal of former first micro- face and former second micro- face in the lateral direction.In the present embodiment, first micro- face is in the lateral direction Transversal be curve 1004a, the transversal of second micro- face in the lateral direction is curve 1005a.It is appreciated that the first input light 1021a is incident in the reflected light 1011a after first micro- face 1004a（Namely the first output light）No longer only unique outgoing side To, but the light for being incident in diverse location has different reflection directions；Likewise, to be incident in second micro- by the second input light 1022a Reflected light 1012a after the 1005a of face（Namely the second output light）Nor only unique exit direction, but be incident in not Light with position has different reflection directions.As long as the therefore curved-surface shape in first micro- face of control micro-structural and second micro- face, It is specific distribution that can, which controls the light distribution of output light,.Specifically, first micro- face 1004a is near micro-structural top Position and first micro- face 504a of original are basically identical, by the light 1011a-1 that this part reflects and the first output in Fig. 5 e Light 511a is same direction.First micro- face 1004a further away from the top of micro-structural its relative to first micro- face 504a of original more to Interior bending, this light 1011a-2 for causing to be reflected by first micro- face 1004a middle parts shooting angle is relative to light The 1011a-1 more normal directions away from screen, the light 1011a-3 come out by first micro- face 1004a bottom reflections outgoing Angle is relative to the light 1011a-2 more normal directions away from screen.It is appreciated that because first micro- face 1004a is with original The curved surface of the first micro- face 504a gradual change for being shaped as starting, therefore the first output light 1011a is exactly with former first output light 511a is the light beam to remote screen normal Directional Extension of rim ray.Second micro- face 1005a design method is identical with this. This method is applied to produce the screen design of Fig. 8 a to Fig. 8 c light distribution；It is worthy of note that this method is particularly suitable It is this at least one rim ray in Fig. 8 b and Fig. 8 c（Such as rim ray 816 and 817）The very high situation of angle requirement.

From described above, the first output light 1011a distribution is relevant with first micro- face 1004a shape, to first The appropriately designed distribution that can control the first output light 1011a accordingly of micro- face 1004a shapes.Likewise, to second micro- face The design of 1005a shape can control the second output light 1012a distribution.

In this citing, first micro- micro- face 1005a of face 1004a and second are consecutive variations, and actually continuous Curved surface does not allow easy processing, therefore can be come using the plain splice of multistage normal direction consecutive variations approximate.

Example shown in Figure 10 b is identical with the purpose that Figure 10 a are reached, and distinguishes and be, first micro- face 1006a is not to connect Continuous, but indention.Each sawtooth has a face to export towards input light, the normal direction consecutive variations in these faces Light realizes specific distribution.

Example shown in Figure 10 c is identical with the purpose that Figure 10 a are reached, but in the example shown in Figure 10 c, former micro- knot Structure（Triangle shown in dotted line）Substituted by more sub- micro-structurals, every sub- micro-structural can rely on two micro- in face of defeated The reflection for entering light is controlled to the direction of output light, but the direction difference of output light caused by each micro- face and continuous change Change, this makes it possible to the specific distribution for realizing output light.

Although it is appreciated that Figure 10 a to Figure 10 c be directed to Fig. 5 e in micro-structural be improved, this simply illustrate and , practically identical method can also be applied to other embodiments of the invention, as long as micro- by controlling in this embodiment The shape of structure, prism unit, reflector element etc. controls the direction of output light, it is possible to further application drawing 10a or figure 10b controls output light to Fig. 5 e improved method, by changing micro-structural, prism unit, the surface configuration of reflector element Distribution, or application drawing 10c is to the improved method of Fig. 5 e structures, it is anti-by using multiple different sub- micro-structurals, sub- prism, son Penetrate unit and control the distribution of output light for entirety.Further, Figure 10 a to Figure 10 c improved method, can also be with dissipating Penetrate and be combined to realize that the angle of output light controls.

Shown in Figure 11 is another citing for exporting light distribution, and it is a kind of modified to Fig. 2.Light shown in Fig. 2 In distribution, the first output light is incident in the left eye 241 of observer, and the second output light is incident in the right eye 242 of same observer； This make it that in addition to this observer, other positions can not all watch 3D rendering.Light distribution shown in Figure 11 then solves This problem, it can cause in two orientation before screen 1101 it can be seen that 3D rendering.In Figure 11 Projection Display system In system, two observers be present, the left eye and right eye of the first observer are expressed as 1141 and 1142, the left side of the second observer Eye and right eye are expressed as 1143 and 1144.The first output light being emitted on screen 1101 on optional position is discrete two Beam, the left eye of the first observer and the second observer are incident in respectively, and second be emitted on screen 1101 on optional position is defeated Light extraction is also two discrete beams, is incident in the right eye of the first observer and the second observer respectively.Such first observer and Two observers are just it can be seen that 3D rendering.

As seen from the above description, the emergent light of optional position has specific exit direction for one on the screen 201 in Fig. 2 Light or light beam, it is different, in Figure 11 on screen 1101 optional position emergent light for discrete two have not The light or light beam of same specific exit direction.Realize this effect of screen 1101, it is only necessary to previously described screen Technology is improved.

Still by taking Fig. 5 e embodiment as an example, achieved by being improved to Fig. 5 e screen construction with discrete The function of two light with different specific exit directions.If Figure 12 a and Figure 12 b are exactly two kinds of improved acts to Fig. 5 e Example.In Figure 12 a, first micro- face become by two have different normal directions fritter plane 1204a-1 and 1204a-2 splicing and Into.First input light 1221a is incident in fritter plane 1204a-1 and 1204a-2 surface, can be by controlling fritter plane 1204a-1 normal direction causes the first output light 1211a-1 from the outgoing of its surface to be incident in the left eye of the first observer 1141, while can be by the first output light for controlling fritter plane 1204a-2 normal direction to be emitted from its surface 1211a-2 is incident in the left eye 1143 of the second observer.Likewise, second micro- face 1105a also has different normal sides by two To fritter plain splice form, the second input light 1222a is incident in this two pieces of fritter planes；Can be by controlling this two pieces The normal direction of fritter plane to form two discrete beam the second output light 1212a and be incident in the first observer's respectively to control The right eye 1144 of the observer of right eye 1142 and second.

Screen micro-structural shown in Figure 12 b is actually a kind of Figure 12 a deformation.By in Figure 12 a first micro- face 1204a's The combination that two fritter plane 1204a-1 and 1204a-2 and second micro- face 1205a two fritter planes are distinguished is to form Adjoin each other two independent sub- micro-structurals, the face towards the first input light of each sub- micro-structural respectively with fritter plane 1204a-1 is identical with 1204a-2.It is appreciated that this little micro-structural can so reach with Figure 12 a's as an entirety The same technique effect of screen micro-structural.

It is appreciated that only to there is two observers to illustrate before screen in Figure 12 a and Figure 12 b.In the same way, if N observer is present, then for Figure 12 a screen micro-structural, each micro- face just needs different n small by normal direction Block plain splice forms, and face corresponds respectively to n observer slightly for this；And for Figure 12 b screen micro-structural, it is necessary to Variform sub- micro-structurals adjacent n, micro- face in each micro-structural correspond respectively to n observer.

It is appreciated that Figure 12 a, Figure 12 b although be directed to Fig. 5 e in micro-structural be improved, but this simply illustrate and , practically identical method can also be applied to other embodiments of the invention, as long as micro- by controlling in this embodiment Structure, prism unit, the shape of reflector element control the direction of output light, it is possible to which further application drawing 12a is to Fig. 5 e The improved method of structure, the distribution of output light is controlled by changing micro-structural, prism unit, the shape of reflector element, or Application drawing 12b is by using multiple different sub- micro-structurals, sub- prism, sub- reflector element to the improved method of Fig. 5 e structures One entirety controls the distribution of output light.

By herein, the distribution for the output light that we can be protected to the present invention carries out a summary.Fig. 1 and Fig. 2 are retouched The simplest form of output light distribution is stated, i.e., the first output light and the second output light difference of any point outgoing from screen For the light beam of a branch of specific direction.Fig. 8 a to Fig. 8 c describe another form of output light distribution, i.e., the arbitrfary point from screen The first output light and/or the second output light of outgoing have a specific angular range, particularly preferably in this angle In the range of output light light distribution it is controllable.Figure 12 a and Figure 12 b then describe the third form of output light distribution, i.e., from screen The first output light of any point outgoing and the second output light are respectively that n (n be not less than 2) beam is discrete, different directions outgoing on curtain Light beam.

What the form of these three output light distributions was possible to, this detailed introduction in above by implementation .Moreover, the form of these three output light distributions is all the application value for having its important.It is appreciated that second and the 3rd The form of kind output light distribution can be used in mixed way, i.e. the first output light and/or the second output light can also be n（N is not less than 2） The discrete beamlet of beam, each beamlet have a specific angular range.It is used in mixed way second and the third output light Distribution can obtain such practical effect：There is two or more positions that there is 3D visual effects before screen, and its Its position can then watch 2D images simultaneously.One summary is carried out to the above output light distribution, exactly exporting light distribution needs Meet following condition, exactly belong to protection scope of the present invention：

Observer certainly exists mutually non-overlapping when watching screen up to a little less A in whole horizontal view angle scope First angular field of view and the second angular field of view, it can be seen that the first output light is just looked at less than the second output in the first angular field of view Light, it can be seen that the second output light is just looked at less than the first output light in the second angular field of view.

In the above description, using two beam output lights as citing, actually can also the method according to the invention realize it is more The output light of beam.According to description of the invention, the projection for easily obtaining multi beam output light in the same way shows those skilled in the art Show system and the design method of screen.

Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills Art field, is included within the scope of the present invention.

Claims

A kind of 1. projection display system, it is characterised in that：

Including a projection light source and a screen, the input light that projection light source projects is projected on screen surface, and the input light is pressed It is divided into the first input light and the second input light according to the difference of particular optical attribute, what the first input light and the second input light were carried Image is different, and from projection light source simultaneously or timesharing is projected；

The screen includes prism array, divides on two normal directions of prism array different first surface and second surface Not Fu You the first filter coating and the second filter coating, the first filter coating is by the first input light for being incident in first surface to reflect or instead The mode penetrated is cast out to form the first output light of screen, at the same will be incident in first surface the second input light absorbs or Lead toward prism array and will be incident in the second input light of second surface backwards to the side of the first output light outgoing, the second filter coating Cast out in a manner of reflecting or reflecting to form the second output light of screen, while the first defeated of second surface will be incident in Enter light absorbs or lead toward prism array backwards to the side of the second output light outgoing；

First output light and the second output laser have different exit directions so that whole when watching screen up to a little less A Mutually non-overlapping the first angular field of view and the second angular field of view are certainly existed in individual horizontal view angle scope, in the first angular field of view It is interior it can be seen that the first output light is just looked at less than the second output light, it can be seen that the second output light is just looked in the second angular field of view Less than the first output light.
2. projection display system according to claim 1, it is characterised in that the first surface and second surface are prisms Two faces in array in a prism unit, or first surface and second surface are two prism lists in prism array respectively Corresponding surface in member.
3. projection display system according to claim 1, it is characterised in that：

The input light is divided into the first input light and the second input light according to the difference of wavelength；

First filter coating includes first group of three high transmittance wave band, corresponds respectively to blueness, green and red band, this Three wave bands correspond to three primary colours that the first input light carries image；Second filter coating includes second group three simultaneously High transmittance wave band, correspond respectively to blueness, green and red band, these three wave bands and carry figure corresponding to the second input light Three primary colours of picture；Wherein first group and second group of high transmittance wave band intersect on wavelength；

Or first filter coating includes first group of three high reflectance wave band, corresponds respectively to blue, green and red ripple Section, these three wave bands correspond to three primary colours that the first input light carries image；Second filter coating includes second simultaneously Three high reflectance wave bands of group, correspond respectively to blueness, green and red band, these three wave bands and correspond to the second input light institute Carry three primary colours of image；Wherein first group and second group of high reflectance wave band intersect on wavelength.
4. projection display system according to claim 1, it is characterised in that the screen is in the prism array backwards to the The side of one output light and the second output light exit direction also includes absorbed layer.
5. projection display system according to any one of claim 1 to 4, it is characterised in that：

The prism array includes at least one prism, and at least one surface of the prism has difference for curved surface or by multiple The fritter plain splice of normal direction forms so that the first output light projected from the prism and/or the direction of the second output light It is distributed as predetermined distribution；

Or the prism array includes n adjacent sub- prisms, n is more than or equal to 2, and this n sub- prisms are used to project first The normal direction of the corresponding flat of output light and/or the second output light is different so that this n sub- prisms are thrown as an entirety The first output light and/or the directional spreding of the second output light penetrated are predetermined distribution.
6. projection display system according to any one of claim 1 to 4, it is characterised in that

First angular field of view positioned at from screen A points to the line direction of observer's place between the eyebrows with a left side angular field of view in, and The left eye of observer falls in the first angular field of view；Second angular field of view is located on screen A points to the company of observer's place between the eyebrows Line direction is so that in the angular field of view on the right side, and the right eye of observer falls in the second angular field of view；

Meanwhile first the image that is carried of input light be left-eye image in 3D display, the image that the second input light is carried is Eye image in 3D display.
7. projection display system according to any one of claim 1 to 4, it is characterised in that in whole horizontal view angle model Also include the 3rd angular field of view between the first angular field of view and the second angular field of view, the energy in the 3rd angular field of view in enclosing It is enough to see the first output light and the second output light simultaneously.
8. projection display system according to any one of claim 1 to 4, it is characterised in that the screen also includes dissipating Layer is penetrated, a part of the scattering layer independently of other elements either other elements of screen.
9. projection display system according to claim 8, it is characterised in that the angle of scattering of the scattering layer in the horizontal direction Degree is less than the scattering angle in vertical direction.
10. projection display system according to claim 9, it is characterised in that the scattering layer includes array arrangement or miscellaneous Dissipate the horizontally extending multiple cylinders or cylinder of arrangement.