CN103809361A

CN103809361A - Projection display system

Info

Publication number: CN103809361A
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: 2014-05-21
Anticipated expiration: 2033-10-08
Also published as: CN103809361B

Abstract

Input light which is emitted from a projection light source is projected on the surface of a screen; the input light is divided into first input light and second input light according to different optical properties; images which are born through the first input light and the second input light respectively are different; the first input light and the second input light are emitted from the projection light source; the screen comprises a prism array; a first filter film and a second filter film are arranged on a first surface and a second surface of the prism array respectively and accordingly the input light which is incident to the first surface can be filtered into the first input light, the input light which is incident to the second surface can be filtered into the second input light, and the first input light and the second input light are refracted or reflected by the first surface and the second surface respectively and are different in emergent direction, wherein the normal directions of the first surface and the second surface are different. According to a projection display system, the different images are formed in the different directions and accordingly people at different positions can see the different images or two eyes of the same person can see the different images so as to form a new display effect.

Description

Projection display system

Technical field

The present invention relates to display technique field, particularly relate to projection display system.

Background technology

Projection Display has obtained increasing application at present.The principle of Projection Display is, utilize projector that image light is projected on a screen, this image light is scattered on this screen, and the image light that wherein part is scattered is received by human eye, just send as being both on screen at these image light of human eye, on screen, just formed like this image.

Projection Display is divided into just throws and rear-projection.Zheng Touji projector and spectators are in the same side of screen, and rear-projection is projector and the relative both sides of spectators at screen.For just throwing, the effect of screen is scattering and reflected image light, and for rear-projection, the effect of screen is scattering and transmission image light.

Summary of the invention

The present invention proposes a kind of projection display system, comprise a projection light source and a screen, the input light projection that projection light source penetrates is in screen surface, this input light is divided into the first input light and the second input light according to the difference of the optical properties such as wavelength or polarization state, the first input light is different with the image that the second input light carries, and from projection light source while or timesharing ejaculation; Screen comprises prism array, on the different first surface of two normal directions of prism array and second surface, there are respectively the first filter coating and the second filter coating, make the input light that is incident in first surface be filtered into the first input light, the input light that is incident in second surface is filtered into the second input light; This first input light and the second input light are had different exit directions by the refraction of first surface and second surface or reflection respectively, make in the time watching on screen 1 A, in whole horizontal view angle scope, certainly exist not overlapping the first angular field of view and the second angular field of view mutually, in the first angular field of view, can see that the first output light just looks at less than the second output light, in the second angular field of view, can see that the second output light just looks at less than the first output light.

The projection display system that the present invention proposes, forms different images in different directions, and the people that can make at diverse location like this sees different images, or makes two eyes of same person see different images, to form brand-new display effect.

Accompanying drawing explanation

Fig. 1 and Fig. 2 be two of principle of work of projection display system in the present invention for example;

Fig. 3 a and 3b are respectively vertical view and the side views of an embodiment of projection display system of the present invention;

Fig. 3 c is a structural representation of giving an example of microstructure on screen in Fig. 3 a illustrated embodiment;

Fig. 3 d is that the reflectivity of the first filter coating and the second filter coating in Fig. 3 c is with wavelength variations schematic diagram;

Fig. 3 e and Fig. 3 f are two other structural representations of giving an example of microstructure on screen in Fig. 3 a illustrated embodiment;

Fig. 3 g is that the reflectivity of the beam splitter layer of microstructure shown in Fig. 3 f is with wavelength variations schematic diagram;

Fig. 3 h and Fig. 3 i are the one distortion of the microstructure shown in Fig. 3 f;

Fig. 4 a is the vertical view of another embodiment of projection display system of the present invention;

Fig. 4 b is that in Fig. 4 a illustrated embodiment, on screen, one of microstructure for example;

Fig. 5 a is the vertical view of another embodiment of projection display system of the present invention;

Fig. 5 b and Fig. 5 c are respectively front elevation of giving an example and the upward views of screen in Fig. 5 a illustrated embodiment;

Fig. 5 d and Fig. 5 e are respectively the microstructure schematic diagram of two positions on screen in Fig. 5 a illustrated embodiment;

Fig. 5 f is another front elevation of giving an example of the screen of the embodiment shown in Fig. 5 a;

Fig. 5 g is the schematic three dimensional views of the microstructure of the screen shown in Fig. 5 f;

Fig. 6 a is the vertical view of another embodiment of projection display system of the present invention;

Fig. 6 b is a front elevation of giving an example of the screen of Fig. 6 a illustrated embodiment;

Fig. 6 c and Fig. 6 d be two of side view of the screen of Fig. 6 a illustrated embodiment for example;

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

Fig. 8 a to Fig. 8 c be projection display system in the present invention principle of work other three for example;

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

Figure 10 a to Figure 10 c is the improved schematic diagram microstructure of Fig. 5 e being done for the principle of work of Fig. 8 a to Fig. 8 c;

Figure 11 is that the another one of the principle of work of projection display system in the present invention is given an example;

Figure 12 a and Figure 12 b are the improved schematic diagram microstructure of Fig. 5 e being done for the principle of work of Figure 11.

Embodiment

Fig. 1 and Fig. 2 be two kinds of working methods for projection display system proposed by the invention for example.In Fig. 1, screen 101 is for receiving input light (input light does not draw), and be the first output light 111 and the second output light 112 that two bundles carry respectively different images by inputting at least partly light projection, and the first output light 111 is different with the exit direction of the second output light 112.In the present invention, it is modulated and with image information according to picture signal that light beam " carrying " image refers to light beam, and " projection " is interpreted as to specific direction or specific direction scope outgoing.In figure, eyes 141 and 142 represent respectively the position at two people places of watching, and can find out that three light for representing the first output light 111 are all incident in eyes 141, are all incident in eyes 142 for three light that represent the second output light 112.Therefore eyes 141 can be seen the entrained image of the first output light 111 on screen 101, just look at less than the entrained image of the second output light 112, eyes 142 can be seen the entrained image of the second output light 112 on screen 101 simultaneously, just look at less than the entrained image of the first output light 111.Such benefit is, only uses same screen, takies unique screen space, just can provide different image displays for the people of different azimuth.This obviously can be applied to multiple fields, for example window advertising, and same pedestrian walks in different positions can see different ad contents, in reaching propaganda objective, provides cost savings.

The function of the screen 201 in Fig. 2 and Fig. 1 approach, and difference is, the exit direction of the first output light 211 and the second output light 212 is more close, now eyes 241 and eyes 242 have represented respectively same observer's two of left and right eyes.Same, eyes 241 can be seen the entrained image of the first output light 211 on screen 201, just look at less than the entrained image of the second output light 212, eyes 242 can be seen the entrained image of the second output light 212 on screen 201 simultaneously, just look at less than the entrained image of the first output light 211, two eyes of observer are seen picture material difference.As long as control the picture material of the first output light 211 and the second output light 212 and correspond respectively to the image of left eye and right eye in 3D rendering, observer just can see 3D rendering effect like this.

Below only use two examples that the principle of work of projection display system of the present invention and screen is described.The concrete methods of realizing of this projection display system and screen thereof is described below in conjunction with accompanying drawing.

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

1. input light represents with dotted line, and first exports light represents 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 angle direction of screen, and left and right angle direction is equal to the level angle direction of screen;

3. the first output light sensing is left, and the second output light points to right, but this is for example, is not restriction.

Fig. 3 a is the vertical view of the projection display system shown in first embodiment of the invention.Wherein, projection light source 351 is positioned at the middle part on screen 301 left and right directions, and is positioned at the homonymy of screen 301 with observer.Therefore the effect of screen 301 is that the light that reflective projection light source 351 sends is seen its observed person.The input light (

light

321a and 321b are two light wherein) representing with dotted line penetrates also projection in screen 301 from projection light source 351, and the range of exposures of input light covers whole screen scope.Carry out the reflecting effect of account for screen 301 as an example of

light

321a and 321b example.Light 321a is incident in behind the 301a region on screen, is divided into two parts by screen, and this two parts light is exported

light

311a and 312a to different directions to form by screen reflection respectively, and light 311a is projected toward left side, and light 312a is turned right by projection.Light 321b is incident in behind the 301b region on screen, is divided into two parts by screen, and this two parts light is formed

output light

311b and 312b by screen reflection to different directions respectively, and light 311b is projected toward left side, and light 312b is turned right by projection.

Fig. 3 b is the side view of the projection display system shown in Fig. 3 a.Projection light source 351 is positioned at the bottom on screen 301 above-below directions, and light 321a is reflected into

output light

311a and 312a by screen 301, and light 321b is reflected into

output light

311b and 312b by screen 301.

From Fig. 3 a and Fig. 3 b, the effect of screen 301 is that

control inputs light

321a and 321b make it be reflected the output light forming on specific direction respectively at left and right angle direction and upper and lower angle direction.In screen and projection display system described in the invention, focus on screen control method to input light and output light on the angle direction of left and right, can use method of the prior art for the control to input light and output light on upper and lower angle direction.For example the most frequently used method is, light is carried out to sufficient scattering on upper and lower angle direction, make input light from the incident of screen below can be not directly on upper and lower angle direction by mirror-reflection and upwards outgoing, cover sizable scope but be scattered on upper and lower angle direction, to guarantee that part reflected light can be incident in observer's eyes.For example another kind of conventional method is again, utilize the microstructure on screen to carry out directed reflection (with reference to accompanying drawing 6c and 6d) to the input light of incident below screen, make it be reflected to observer's eyes, the light intensity that such benefit is to be incident in observer's eyes is larger, shortcoming is that catoptrical angular coverage is little, and the angular field of view that is exactly screen from observer's angle is little.Certainly can understand, these two kinds also can be combined with the control method of upper and lower angle direction glazed thread.No matter use which kind of control method to upper and lower angle direction glazed thread, do not affect effect of the present invention.In the present invention, can use in conjunction with any one control method to upper and lower angle direction glazed thread the control method of left and right angle direction glazed thread, this present invention is not limited.

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

First be described on central region 301b and how realize on the angle direction of left and right input light 321b is reflexed to different directions to form the method for

output light

311b and 312b in conjunction with Fig. 3 c.301b region on screen, comprises at least one prism unit 302b, and these prism unit form a prism array (only marking a prism unit 302b in Fig. 3 c with signal).Prism unit 302b comprises towards the incident direction of input light two faces, first surface and the second surfaces that normal direction is different.On the first surface of prism unit, be coated with the first filter coating 304b, make the input light 321b that is incident in first surface be divided into two bundles, a branch of is reflected light 311b, and a branch of is transmitted light 331b, and wherein transmitted light 331b is arranged at the absorption layer 303b absorption at prism array rear.On the second surface of prism unit, be coated with the second filter coating 305b, make the input light 321b that is incident in second surface be divided into two bundles, a branch of is reflected light 312b, and a branch of is transmitted light 332b, and wherein transmitted light 332b is arranged at the absorption layer 303b absorption at prism array rear.

In the present embodiment, the first filter coating and the second filter coating are according to wavelength, input light 321b to be divided into two-partly, and the reflectivity of the first filter coating and the second filter coating with the change curve of wavelength as shown in Figure 3 d.In Fig. 3 d, broken line shown in solid line is the reflectance varies curve of the first filter coating 304b, and it comprises three high reflectivity regions 304b-B(corresponding to blue spectral region), 304b-G(is corresponding to green spectral region), 304b-R(is corresponding to red spectral region); Broken line shown in dotted line is the reflectance varies curve of the second filter coating 305b, and it comprises three high reflectivity regions 305b-B(corresponding to blue spectral region), 305b-G(is corresponding to green spectral region), 305b-R(is corresponding to red spectral region); Three high reflectivity regions of the first filter coating are intersected on wavelength mutually with three high reflectivity regions of the second filter coating.Now, projection light source 351 can be set to be made to input light 321b and carries two images simultaneously, the first image is using 304b-B, 304b-G and corresponding three spectrum segments of 304b-R as three primary colours, and the second image is take 305b-B, 305b-G and corresponding three spectrum segments of 305b-R as three primary colours.Such the first image will be reflected into the first output light 311b by the first filter coating 304b of the first surface of prism 302b, and the second image can be reflected into the second output light 312b by the second filter coating 305b of the second surface of prism 302b.

Two entrained images of input light of projection light source, can be outgoing simultaneously, can be also timesharing outgoing.This is all prior art, only illustrates its implementation herein.The situation of two images outgoing is simultaneously, first produces respectively two image light according to two picture signals of input, and the different optical filters that use of spectrum of two image light of recycling combine light into as a branch of outgoing.The another kind of situation of another image outgoing is simultaneously, first produces respectively two image light according to two picture signals of input, and two image light are projected to screen through contiguous camera lens respectively, and such two image light are due to relatively near being also approximately a branch of.The situation of two image timesharing outgoing is, in projection light source, can carry out with the colour wheel that comprises two groups of three primary colours in Fig. 3 d two groups of primary lights of generation of timesharing, light valve carries out respectively synchronous modulation to produce two image light of timesharing outgoing according to two picture signals of input to these two groups of primary lights.

Fig. 3 e is the structural representation in 301a region to the right on screen in Fig. 3 a.What the 301b region represented from Fig. 3 c was different is, in prism array in Fig. 3 e, comprise two prism unit 302a, these two prism unit have respectively a surface to be transfused to light 321a irradiation, these two surfaces are respectively surperficial 304a and surperficial 305a, and these two irradiated normal to a surface direction differences.On these two surfaces, plate so respectively the first filter coating 304a and the second filter coating 305a, just input light can be divided into output light 311a and the 312a of two different wavelength range and project to different directions.Be appreciated that, the key distinction point of the screen construction in the screen construction in Fig. 3 e and Fig. 3 c is, in Fig. 3 c, utilize two surfaces of same prism that input light is decomposed into two bundles, i.e. the first input light and the second input light, and it is reflected respectively to projection is the first output light 311b and the second output light 312b; And in Fig. 3 e, utilized each surface of two prisms to reach identical object.

What Fig. 3 e represented is in Fig. 3 a structural representation in 301a region to the right on screen, wherein because input light 321a comes from left side incident, therefore the first filter coating 304a and the second filter coating 305a are plated in respectively on the surface in left side of two prism unit to meet to incident light; Be appreciated that for region to the left on screen, because input light will come from right side incident, the first filter coating and the second filter coating are plated on the surface on right side of two prism unit of correspondence to meet to incident light.Do not do repeat specification for region to the left on screen.In embodiment below, all describe as an example of screen middle part and right side area example, on the left of screen, can do corresponding derivation according to the structure on right side.

Hold intelligible, in the screen of the present embodiment, the structure of central region 301b and fringe region 301a is different, this be mainly due to projection light source 351 in screen the middle part on left and right directions, cause the incident angle difference of the input light that is incident in region 301b and region 301a very large.Might not there is in actual applications such restriction.For example be positioned at the left side of screen when projection light source, for whole screen scope, the light of each position is from left side incident, now those skilled in the art easily design the structure on each region on screen according to the description of Fig. 3 e, now may not adopt the structure shown in Fig. 3 c.

What deserves to be explained is, in actual applications, the position of the first filter coating and the second filter coating also not necessarily prism on the face of input light incident direction, also can be positioned at prism facets on the face of absorption layer.And the first filter coating and the second filter coating itself can be absorptive-type filter coatings, so just the function of absorption layer are integrated on filter coating, now absorption layer can omit.

Because input only projects to screen from projection light source, therefore be incident in all very little (solid angle of this cone angle equals the projection lens bore of projection light source and the projection lens ratio of distances constant to position A) of incident cone angle of the input light of arbitrary position A on screen, therefore can accurately control in the present embodiment, the exit direction of output light by the prism unit designing on screen.This is the essential reason that the present invention has excellent effect.

Except Fig. 3 c, Fig. 3 f be in Fig. 3 a on screen middle part 301b region another kind of structural representation.In this structure, first input light 321b is incident in a prism array (only drawing a prism 307b in figure with signal).In the present embodiment, on the face of inputting dorsad light incident direction of prism 307b with beam splitter layer 308b(in actual applications beam splitter layer may directly be plated on prism surface), can according to the difference of wavelength by incident light be divided into transmission and reflection two bundles.Beam splitter layer on different prisms in prism array also forms a beam splitter layer array, and in the present embodiment, beam splitter layer array all in same plane and attribute identical, therefore beam splitter layer array should form an overall beam splitter layer.Input light 321b deflects and is incident in beam splitter layer 308b after the refraction of prism 307b, the light beam being reflected by beam splitter layer 308b is outgoing formation the first output light 311b after prism 307b refraction again, through a branch of reflection horizon 309b that is positioned at beam splitter layer 308b light path rear end that is incident in of beam splitter layer 308b transmission, transmission beam splitter layer 308b again after surface, reflection horizon is reflected, and outgoing forms the second output light 312b after the refraction of prism 307b.Because transmitted light on beam splitter layer 308b is different with catoptrical light path, the first output light 311b of therefore being formed respectively by them is different with the exit direction of the second output light 312b.Specifically, can control the exit direction of the first output light 311b by controlling the shape of prism 307b, further can control the direction of the second output light 312b by controlling reflection horizon 304b, so just reach the object of controlling two output light directions.

In the present embodiment, reflection horizon 309b is reflector element array, each reflector element indentation in the horizontal direction, and this sawtooth drift angle is in the horizontal direction 90 degree, can reach effect along former direction reflection by it like this according to known its of geometric knowledge to incident light.In fact the drift angle of sawtooth can not be also 90 degree, controls this angle and can reach the object of controlling reflected light direction.The method that realizes in addition reflection horizon also has a lot, for example directly adopt the mode of on the substrate that has fixed structure metal-coated films or dielectric film, control catoptrical direction by the shape of control structure, more for example reach and make the object of incident light along former direction reflection with glass microballoon array.

Fig. 3 g has represented that the reflectivity of beam splitter layer 308b in Fig. 3 f is with the variation of wavelength.Comprise that in the drawings three high reflectivity regions 308b-rB(are corresponding to blue spectral region), 308b-rG(is corresponding to green spectral region) and 308b-rR(corresponding to red spectral region), comprise that at the crack of these three high reflectivity regions three high-transmission rate region 308b-tB(are corresponding to blue spectral region), 308b-tG(is corresponding to green spectral region) and 308b-tR(corresponding to red spectral region).Be appreciated that the two-beam through beam splitter layer 308b light splitting, reflection a branch of take these three corresponding spectral colors of high reflectivity regions as three primary colours, transmission a branch of take three corresponding spectral colors in high-transmission rate region as three primary colours.As long as projection light source 351 is set like this to be made to input light 321b and carries two images simultaneously, image is using 308b-rB, 308b-rG and corresponding three spectrum segments of 308b-rR as three primary colours, and another image is take 308b-tB, 308b-tG and corresponding three spectrum segments of 308b-tR as three primary colours.These two images will be divided in screen inside two bundles like this, i.e. the first input light and the second input light, and be reflected to respectively different direction formation the first output light 311b(311a) and the second output light 312b(311a).Two entrained images of input light of projection light source, can be outgoing simultaneously, can be also timesharing outgoing, and unrestricted.

Fig. 3 h and Fig. 3 i are the one distortion of structure shown in Fig. 3 f, and the structure applications of Fig. 3 h is in the zone line 301b of screen 301, and the structure applications of Fig. 3 i is in 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, after being incident in beam splitter layer 308b, input light 321b is divided into two bundles, reflecting part forms output light 311b, transmissive portion is through being reflected a layer 309b reflection after prism 307b, and again after optical prism 307b and beam splitter layer 308b, forms output light 312b.Structure shown in this structure and Fig. 3 f just changes to some extent on parts order, and the shape in reflection horizon is different, and those skilled in the art can oneself design according to describing, and therefore all belong to protection scope of the present invention.In the present embodiment, the beam splitter layer on prism array on each prism forms an array, and these beam splitter layers are inevitable not in same plane, can not form an overall beam splitter layer.

In the structure shown in Fig. 3 i, reflection horizon 309a is reflector element array, wherein in figure, only draws a reflector element 309a, reflector element 309a indentation.Input light 321a incides the beam splitter layer 308a on prism 307a surface from left direction, the corresponding shape of adjusting prism 307a is controlled the exit direction of reflected light part 311a, the primary event of transmissive portion process reflector element array 309a simultaneously, then outgoing forms output light 312a after the refraction of prism 307a.The difference of comparison diagram 3i and Fig. 3 h is appreciated that those skilled in the art can, according to foregoing description, carry out different designs to realize the control of the exit direction to output light for the diverse location of screen.

In embodiment, the first filter coating, the second filter coating and beam splitter layer are all according to the difference of wavelength, light to be filtered or light splitting in the above.In actual applications, also can filter or light splitting light according to the difference of polarization state.For example, in the structure shown in Fig. 3 c and Fig. 3 e, the first filter coating can reflect the polarization state light of A direction, the polarization state light of transmission or absorption B direction, and the second filter coating can reflect the polarization state light of B direction, transmission or absorption A polarization state light, A direction is mutually vertical with B direction.Again for example, in the structure shown in Fig. 3 f, Fig. 3 h and Fig. 3 i, beam splitter layer can be reflection A direction polarization state light transmission simultaneously B direction polarization state light, and A direction is mutually vertical with B direction.Like this, as long as projection light source is set to be made to input light and carries two images simultaneously, an image is entrained with A direction polarization state light, another image is entrained with B direction polarization state light, and these two images will be divided into two bundles and be reflected to respectively different direction formation the first output light and the second output light in screen inside like this.Two entrained images of input light of projection light source, can be outgoing simultaneously, can be also timesharing outgoing, and unrestricted.

In structure shown in Fig. 3 f to Fig. 3 i, in figure, only draw a prism unit, a beam splitter layer unit and a reflector element, in practical application, may be the prism array of multiple prism compositions and the reflective array being formed by multiple reflector elements.Prism unit and reflector element might not be one to one, and the transmitted light of a prism unit of transmission may be incident in another prism unit after reflector element reflection.In addition, reflection horizon also may be combined as a whole with prism.Therefore, the light path design that Fig. 3 f to Fig. 3 i does, only for illustrating, is not 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 higher.This is because the former has part light to be absorbed, and the latter's input light is divided into two bundles, and this two-beam is all utilized.

Embodiment shown in synthesizing map 3a to Fig. 3 i can find out, screen 301 is divided into two bundles according to the difference of particular optical attribute by input light, the first input light and the second input light, and the first input light is projected forms the first output light, the second input light is projected forms the second output light, and two bundle output light carry different images and shooting angle difference.Wherein particular optical attribute includes but not limited to wavelength and polarization state.Utilize the design to screen, can realize the accurate control of the angle to two bundle output light.

In the embodiment shown in Fig. 3 a to Fig. 3 i, screen is all reflection-type, and observer and projection light source are at the homonymy of screen.In fact, screen can be also transmission-type, i.e. observer and the relative both sides of projection light source at screen.As shown in Fig. 4 a, light that projection light source 451 is sent (in figure take light 421b as example), after screen 401 transmissions, forms two bundle output light (in figure take light 411b and 412b as example) projection toward different directions.

Fig. 4 b is the structural representation in 401b region on screen in Fig. 4 a.Input light 421b is incident in prism array (only drawing a prism 402b in figure with signal), and be incident in two surfaces of each prism, these two surfaces have different normal directions, and are coated with respectively different filter coatings, the first filter coating 404b and the second filter coating 405b.After input light 421b is filtered by the first filter coating 404b, part light optical prism surface is also formed output light 411b by prismatic refraction, and reflected light 431b is reflected back projection light source direction.After input light 421b is filtered by the second filter coating 405b, part light optical prism surface is also formed output light 412b by prismatic refraction, and reflected light 432b is reflected back projection light source direction.Now, as long as the input light of projection light source projection carries two different images, the spectrum of the primary lights that these two images use is corresponding with the transmission spectrum of the first filter coating and the second filter coating respectively, and the output light that just can realize different images projects different directions.

Comparison diagram 3c and Fig. 4 b are appreciated that, both principles are similar, the structure that difference is only Fig. 3 c is reflection-type and Fig. 4 b structure is transmission-type, therefore the ordinate of Fig. 3 d is changed into " transmitance " and just can represent the first filter coating and the transmitance of the second filter coating and the relation of wavelength.In actual applications, the distortion of Fig. 3 e, Fig. 3 f, these Fig. 3 c structures of Fig. 3 h, Fig. 3 i, can be applied in the design of transmission-type accordingly, repeats no more herein.

In the above-described embodiments, only use a projection light source to produce input light, this input light carries two different images according to the difference of the optical properties such as wavelength or polarization state, these two images are separately formed the first input light and the second input light according to the difference of the optical properties such as wavelength or polarization state again on screen, and are the first different output light of exit direction and the second output light via the inner different light path projection of screen respectively.In fact, also can use two projection light sources to produce respectively the first input light and the second input light from different positions, the first input light and the second input light carry respectively different image (as shown in embodiment below).Wherein, the first input light is formed the first output light by screen projection, and the second input light is formed the second output light by screen projection.If the contact in these two image life periods, for example these two images correspond respectively to people's left-eye image and eye image for realizing 3D effect, and the first input light and the second input light that so just need to control two projection light sources outputs carry out synchronously.If two images are uncorrelated, without synchro control.

The vertical view of the projection display system of an alternative embodiment of the invention as shown in Figure 5 a.This projection display system comprises two projection light sources, the first projection light source 551 and the second projection light source 552 lay respectively at the both sides of screen 501 on left and right directions, the first input light (only drawing two light 521a and 521b in figure with signal) that the first projection light source 551 is sent projects screen 501 from left side, and the second input light (only drawing two light 522a and 522b in figure with signal) that the second projection light source 552 is sent projects screen 501 from right side.Light 521a and light 522a are incident in the right side area 501a on screen, and light 521b and light 522b are incident in the central region 501b on screen.The first input light 521a is reflected to form the first output light 511a by right side area 501a, the second input light 522a reflected to form to the second output light 512a simultaneously, and the first output light 511a is different with the direction of the second output light 512a.Similar, the first input light 521b is reflected to form the first output light 511b by central region 501b, the second input light 522b reflected to form to the second output light 512b simultaneously, and the first output light 511b is different with the direction of the second output light 512b.The first output light 511a and 511b shoots to identical direction and observed person sees just can see that the observer in this orientation the first output light that on screen, diverse location is penetrated is to form the complete image of a pair so simultaneously; As a same reason, the observer in the exit direction of the second output light 512a and 512b also can see on screen that the second output light that diverse location is penetrated is to form a secondary complete image.

In actual applications, comprise that in order to meet 3D is presented at interior specific demand, this projection display system also may comprise image synchronization control device (not shown in FIG.), be used for controlling the first projection light source 551 and the second projection light source 552, the image phase mutually synchronization that the first input light and the second input light are carried.

Fig. 5 b to Fig. 5 e shown screen 501 structure one for example, describe below in conjunction with these a few width figure.Fig. 5 b is the front elevation of system shown in Fig. 5 a.On screen, comprise microstructured layers, this microstructured layers is prism array in the present embodiment.In prism array, each prism comprises towards two surfaces of input light, first micro-and second micro-.First micro-and second micro-are upper with reflection horizon, may be to be specifically plated on first micro-and second micro-surperficial metallic reflector or dieletric reflection layer.Fig. 5 c is 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 real size and ratio, the prism in practical application in prism array with respect to the size of screen than much smaller shown in figure; So amplify and show for convenience of description here.

Fig. 5 d has shown the principle of work in 501b region on screen.In Fig. 5 d, be the vertical view of a prism, this prism facets is first micro-504b and second micro-505b to two surfaces of input light, first micro-504b and second micro-505b surface with or be coated with reflectance coating.First micro-504b is towards the first input light 521b, and receiving and project the first input light 521b is the first output light 511b, and second micro-505b is towards the second input light 522b, and receiving and project the second input light 522b is the second output light 512b.Like this, by controlling the shape of prism, control the normal direction of first micro-504b and second micro-505b, just can control accurately the exit direction of the first output light 511b and the second output light 512b.It should be noted that simultaneously first micro-504b in the first input light 521b not towards the second input light 522b, such the second input light 522b just can not be irradiated on first micro-504b; As a same reason, second micro-505b in the second input light 522b not towards the first input light 521b, it is upper that the first input light 521b can not be irradiated to second micro-505b yet, can make like this crosstalk minimization between the first output light and the second output light.In fact,, even if there is small part first to input the situation appearance that light is incident in second micro-, because the normal direction of second micro-is improper, this part first input light still can not formed and crosstalk toward the exit direction of the second output light by projection.

Fig. 5 e has shown the principle of work in 501a region to the right on screen 501.In Fig. 5 e, drawn the vertical view of a prism, this prism facets is first micro-504a and second micro-the 505a that is coated with reflectance coating to two surfaces of input light.First micro-504a is the first output light 511a for receiving and project the first input light 521a, and second micro-505a is the second output light 512a for receiving and project the second input light 522a.Slightly different from prism in Fig. 5 d is, because the position of region 501a is different from the position of region 501b, therefore the angle difference of incident light, so just need to adjust the shape of prism, adjust first micro-and second micro-'s normal direction, make to control the exit direction of the first output light 511a and the second output light 512a.Specifically, region 501a is on the right side of screen, like this compared to region 501b, the the first input incident direction of light and angle of screen less (closer to the direction that is parallel to screen), and the second the input incident direction of light and angle of the screen direction of vertical screen (closer to) more greatly, therefore for the first output light 511b that realizes the first output light 511a and the reflection of screen middle part has roughly the same exit direction, the second output light 512b of the second output light 512a and the reflection of screen middle part has roughly the same exit direction, prism in Fig. 5 e is compared prism center 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, do not repeat herein.

In the system shown in Fig. 5 b to Fig. 5 e, microstructured layers is the prism array vertically extending being arranged in parallel.If in fact the first projection light source and the second projection light source are positioned over respectively the above and below of screen, the prism array that microstructured layers also may extend for the along continuous straight runs that is arranged in parallel.Therefore the present invention does not limit for the bearing of trend of prism and the orientation of putting of projection light source.In addition, although prism all protrudes from screen body in Fig. 5 b to Fig. 5 e, but in fact also can be sunken (be sunken and be also referred to as prism), be sunken formed two micro-and can play equally the effect of reflecting respectively the first input light and the second input light.

In the screen construction shown in Fig. 5 b to 5e, its shortcoming is that the light control of screen on upper and lower angle direction is not good, for example region on screen top, and the catoptrical shooting angle that reflection forms from the input light lower than this regional location can be on the upper side.This can use scattering layer to solve.Scattering layer can be positioned over screen front (inputting light is first incident in scattering layer and then is incident in screen), may be also a part for screen, for example, form scattering particles layer at micro-structure surface, more for example by micro-structure surface hacking.In the present embodiment, microstructure is towards input light, and microstructure also may be inputted light (with reference to figure 6d) dorsad in practical application, input light and must after first transmissive viewing screen body, just can be incident in micro-structure surface, now scattering layer may be also the scattering particles that are incorporated into screen body interior.And in order to realize the astigmatism direction control on the angle direction of left and right simultaneously on upper and lower angle direction, preferred, scattering layer is less than the scattering angle at upper and lower angle direction at the scattering angle of left and right angle direction.For example the scattering angle of scattering layer on the angle direction of left and right is very little, is 3 ~ 5 degree, and the scattering angle on upper and lower angle direction is 20 ~ 50 degree simultaneously.This scattering layer is prior art, for example, form micro-cylindrical structure that left and right directions (horizontal direction) extends on surface, and these micro-cylindrical structures can arrayed, also can spuiously arrange; For example in screen body, mix again the micro cylinder extending along left and right directions (horizontal direction), also can reach similar effect.And micro-cylindrical structure of screen upper and lower or micro cylinder may be different, have different scattering directions to control diverse location on screen above-below direction.As for the control method to scattering degree, in existing scattering technology, also comprise, do not repeat herein.Be appreciated that scattering technology and methods for using them described herein is equally applicable to other embodiments of the invention.

The not good method of the upper and lower angle direction glazed thread of screen construction control shown in the another kind of Fig. 5 of solution b to Fig. 5 e is to improve screen construction, as shown in Fig. 5 f.Fig. 5 f is the front elevation of another kind of screen construction, different from shown in Fig. 5 b of the microstructure in the microstructured layers in figure.In the screen of the embodiment shown in Fig. 5 f, microstructured layers comprises several microstructures in irregular shape, wherein 4 (still do not draw with former ratio for convenient, actual microstructure is much smaller) in figure, are drawn,

microstructure

5011,5014,5017 and 5018.First the principle of work of each microstructure is described as an example of microstructure 5011 example.

Fig. 5 g is the schematic perspective view of microstructure 5011, and microstructure 5011 surfaces comprise two micro-, and first micro-5012 and second micro-5013, this two micro-is to represent with the intersection of these two faces and screen body in Fig. 5 f.In Fig. 5 g, first micro-5012 substantially just towards the first projection light source 551, the intersection of it and screen body at the light-emitting window take the first projection light source 551 on the circle in the center of circle.So just effectively avoid problem not good to light control on above-below direction, the first input light 521 can be reflected into the first output light 511 for first micro-5012, and the direction of the first output light 511 is all controlled on upper and lower angle direction and left and right angle direction.Same reason, second micro-5013 for the second input light 522 being reflected into micro-5013 of the second output light 512, the second substantially just towards the second projection light source 552, and its curve form is for controlling the exit direction of the second output light 512.Second micro-5013 slightly different from first micro-5012, and second micro-5013 is straight-line segment but not segment of curve with the intersection of screen body, and this straight-line segment is tangent with the circle centered by the light-emitting window of the second projection light source.Because straight-line segment is shorter, so its effect and segment of curve are close, but that it is processed is much easier.Further, first micro-also can be approximated to be straight line section with the intersection of screen body, and whole like this microstructure 5011 is exactly a pyramidal structure, and difficulty of processing is less.In fact, the top of microstructure 5011 can not be also pinnacle but a line or a flat-top.Distortion the present invention to these microstructures does not limit.

Can find out, for micro-5012 of microstructure 5011, the first, towards the first projection light source and not towards the second projection light source, and second micro-5013 towards the second projection light source and towards the first projection light source.And the principle of design of two other face of microstructure 5011 is preferably, as far as possible not towards the first projection light source and the second projection light source, few being mapped to by the first input light and the second input illumination of trying one's best.Therefore these two faces extend along the radioactive ray direction of the light-emitting window from the first projection light source with regard to being designed to, or extend along the radioactive ray direction of the light-emitting window from the second projection light source.From Fig. 5 f, can find out, for microstructure 5011, it is positioned at micro-of first micro-5012 and second micro-5013 belows, to extend along the radioactive ray direction of the light-emitting window from the first projection light source 551, and be positioned at first micro-5012 and second micro-5013 tops micro-of microstructure 5011 is to extend along the radioactive ray of the light-emitting window from the second projection light source 552.For this two micro-, be mapped to even if be transfused to illumination, because normal direction is improper, thus can't cause crosstalking of image, but can form parasitic light, reduce the efficiency of screen.Compare with the microstructure of Fig. 5 e with Fig. 5 d, because being not limited to along some specific directions, the design of the microstructure in Fig. 5 g extends, therefore the microstructure in Fig. 5 g has larger design freedom, more can control accurately the trend (left and right angle direction and upper and lower angle direction) of output light.

Below with the explain arrangement mode of microstructure of

microstructure

5014,5017 and 5018.Microstructure 5014 comprises first micro-5015 and second micro-5016, respectively just towards the first projection light source 551 and the second projection light source 552.Its construction design method is identical with microstructure 5011, does not do

repeat specification.Microstructure

5017 and 5018 below that is positioned at microstructure 5014 side by side.Can find out, in order to meet first micro-and second micro-difference just towards the condition of the first projection light source 551 and the second projection light source 552, between

microstructure

5014,5017 and 5018, can not join completely, but have a white space, these are different from the structure shown in Fig. 5 b.Be appreciated that, as long as microstructure is enough little, this white space is just enough little.

Different from the embodiment shown in Fig. 5 a is, in another embodiment shown in Fig. 6 a, the first projection light source 651 is no longer positioned at the second projection light source 652 both sides that screen is relative, but is positioned at the downside of screen simultaneously, and on left and right directions, pulls open certain distance (with reference to figure 6b).Can realize the object that the first input light and the second input light is projected respectively to form the first output light and the second output light of different exit directions by screen 651 equally like this.Below in conjunction with Fig. 6 b explanation that makes a concrete explanation.

In Fig. 6 b, on screen 601, comprise multiple microstructures, in figure, only draw wherein 4

microstructures

6011,6014,6015 and 6016.First its method of work is described as an example of microstructure 6011 example.Close with the embodiment shown in Fig. 5 g, microstructure 6011 is protruding microstructure, and comprises three micro-, wherein two micro-facing to screen below, first micro-6012 just towards micro-6013 of the first projection light source 651, the second just towards the second projection light source 652.In Fig. 6 b, first micro-and second micro-all represents with the intersection of these two faces and screen body.The first input light 621 is incident in first micro-, by controlling the normal direction of first micro-6012, can control catoptrical direction, controls the exit direction of the first output light 611.Same, the second input light 622 is incident in second micro-, by controlling the normal direction of second micro-6013, can control catoptrical direction, controls the exit direction of the second output light 612.

Because the first projection light source and the second projection light source are all positioned at the below of screen rather than relative, therefore some position on screen, first micro-of microstructure by part towards the second projection light source, or second micro-of microstructure by part towards the first projection light source.In the present invention, face X " towards " object Y, referring to the radioactive ray that send from Y and have at least one can drop on face X, face X " not towards " object Y, refers to the radioactive ray that send from Y and can not drop on completely face X.For example in the present embodiment, the first input light 623 sending from the first projection light source is incident in second micro-6013, and is reflected as parasitic light 613.This has caused the decline of screen efficiency, but because the exit direction of light 613 is different from the direction of the second output light 612, therefore can't form crosstalking between two images.

With

microstructure

6014,6015 and 6016, the arrangement mode between microstructure in the present embodiment is described below.Preferably, can draw two groups of concentric circless as the center of circle take the light-emitting window of the first projection light source and the light-emitting window of the second projection light source respectively, screen is divided into fritter by two groups of concentric circless, fill a microstructure in each fritter, so just can meet each microstructure and there are two difference just towards first micro-and the condition of second micro-of the first projection light source and the second projection light source.As can be seen here, in the present embodiment, microstructure may be triangular pyramid or the three terrace with edge shapes as drawn in Fig. 6 b, but be also not limited to this, because the structure of the first half of each microstructure is unrestricted (in Fig. 6 b, the first half of each microstructure is blank), so the profile of each microstructure also can be filled up the fritter being divided into by two groups of concentric circless, only otherwise affect first micro-and second micro-'s angle.

Fig. 6 c and Fig. 6 d have shown two kinds of side view of screen in the present embodiment for example.In Fig. 6 c, microstructured layers is towards

input light

621 and 622, and input light is directly reflected to form

output light

611 and 612 by microstructured layers.By controlling the form of microstructure in microstructured layers, can control the shooting angle of output light in vertical direction and horizontal direction.Fig. 6 d be another for example, in this example, microstructured layers is inputted light 621 and 622 dorsad, first input light be incident in the surface of microstructured layers after the body of transmissive viewing screen 601 again, and be reflected to form and penetrate light 611 and 612.Be appreciated that in the embodiment of Fig. 5 a to Fig. 5 g, microstructured layers can be inputted light equally dorsad.

In the embodiment shown in Fig. 5 a to Fig. 6 d, screen is all reflection-types, and the concrete mode that the screen of transmission-type is combined with two projection light sources is described below in conjunction with Fig. 7.As shown in Figure 7, the first projection light source 751 and the second projection light source 752 and observer are positioned at the both sides of screen 701.Screen 701 has the structure of Fresnel Lenses, and the first projection light source 751 is positioned at screen center position to the right, and the first input light 721 that it sends, after screen 701 transmissions converging, forms the first output light 711 observer towards left side; The second projection light source 752 is positioned at screen center position to the left, and the second input light 722 that it sends, after screen 701 transmissions converging, forms the second output light 712 observer towards right side.In the present embodiment, utilize the structure of the Fresnel Lenses of screen 701 to converge and transmission input light, and utilize different the first output light and the second output light that forms different exit directions of incident direction of the first input light and the second input light.

From Fig. 3 a to Fig. 7, by the embodiment of different projection display systems and screen construction, describe transmit direction how to control the first output light and the second output light above, and how accurately to have controlled the method for the direction of each light in output light.Meanwhile, Fig. 1 and Fig. 2 have described respectively two kind of first output light applying that these projection display systems and screen construction can realize and the light of the second output light distributes and practical application.In fact, except the light distribution shown in Fig. 1 and Fig. 2 and practical application, apply these projection display systems and screen construction, can also realize the distribution of other output light, and realize other practical application.Shown in Fig. 8 a, Fig. 8 b, Fig. 8 c and Figure 11 be exactly other four kinds for example.

As shown in Figure 8 a, in this embodiment, from screen 801, first of any point outgoing the output light and the second output light all have identical light distribution, are only therefore that example illustrates with screen 801 central points.Shown in Fig. 1 and Fig. 2 for example in, the light that on screen, any point is sent all has a specific direction, and this for example in, on screen, the output light of any point all has a specific direction scope and is not only a specific direction.For example as shown in Figure 8 a, the first output light is take light 811 and 813 light beams as marginal ray, and the second output light is take light 812 and 814 light beams as marginal ray.Now in horizontal view angle scope, at least there are three regions, i.e. the region L take light 811 and light 812 as marginal ray, the region M take light 812 and light 813 as marginal ray, and region N take light 813 and light 814 as marginal ray.Be appreciated that, observer in the L of region can see the first output light and can't see the region of the second output light, observer in the N of region can see the second output light and can't see the region of the first output light, and the observer in the M of region can see the region of the first output light and the second output light simultaneously.Therefore, the image that observer can watch the first projection light source to send at region L, the image that can watch the second projection light source to send at region N; And at region M, observer can see above two width images simultaneously, so forming, direct viewing meeting crosstalks.Therefore at region M, observer can wear 3D glasses, and these two eyeglasses in 3D glasses left and right filter light respectively.For example left eyeglass filters out the second output light and remaining the first output light transmission, and right eyeglass filters out the first output light and remaining the second output light transmission; Or conversely, left eyeglass filters out the first output light and remaining the second output light transmission, and right eyeglass filters out the second output light and remaining the first output light transmission.In a word, left eyeglass should filter out the corresponding image of right eye and only make the image transmission that left eye is corresponding, and right eyeglass should filter out the corresponding image of left eye and only make the image transmission that right eye is corresponding.

In current 3D display, 2D image and 3D rendering can be selected and switch, but but can not show simultaneously.This brings following problem: (1) 3D glasses are generally somewhat expensive, may cause glasses not enough when many people watch simultaneously; (2) not all people is accustomed to wearing 3D glasses; (3) concerning children, also do not prove the vision security of 3D image.Embodiment shown in Fig. 8 a successfully makes 3D rendering and common 2D image on a screen, show simultaneously: stand in region L and N and can watch 2D image, stand in region M and can watch 3D rendering.This display packing obviously will be brought brand-new adventure in daily life.

In the example shown in Fig. 8 a, in the M of region, still must watch with 3D glasses, and 3D glasses itself are very inconvenient, and 3D glasses also increase extra cost.Use 3D glasses in the example shown in Fig. 8 b, are avoided.Take the region 801c in the left side on screen as example.From screen area 801c, first of outgoing the output light is take light 815 and light 816 as marginal ray, and from screen area 801c, second of outgoing exports light take light 817 and light 818 as marginal ray.Can find out that the first output light and the second output light are not overlapping.If there is the observer K that is certain distance to screen, its left eye is expressed as 843a in the drawings, and its right eye is expressed as 843b in the drawings, designs light 816 and is incident in left eye 843a, designs light 817 simultaneously and is incident in right eye 843b.For other position on screen, according to the design of identical principle, the first output light and the second output light do not have overlappingly yet, and two close marginal rays are incident in respectively left eye 843a and right eye 843b mutually.Like this for observer K, its left eye 843a can see that on screen, the first output light of any point is just looked at less than the second output light, right eye 843b can see that on screen, the second output light of any point is just looked at less than the first output light, therefore second export the entrained image of light corresponding to right eye as long as coordinate projection light source to carry out the suitable entrained image of the first output light that is arranged so that corresponding to left eye, what observer K saw is exactly 3D effect image simultaneously.

Meanwhile, observer 841 and observer 842 can only see respectively the first output light and the second output light of every bit on screen, and what therefore see is 2D image.

Fig. 8 c is the distortion of the example of Fig. 8 b.Fig. 8 b for example in, on screen, between first of every bit the output light and the second output light, there is a gap, in this gap, both can't see the first output light and also can't see the second output light.For example, between the output of first on screen area 801c light marginal ray 816 and the second output light marginal ray 817, be exactly such gap.There is a problem in this in actual applications, is exactly that this system is very high for the status requirement of observer K, departs from and a bit just can not see normally 3D.For example observer K is to the left, and its left eye still can be seen the first output light, but its right eye has just been fallen and in gap, be can't see the second output light.Same, this has also proposed very high requirement to the machining precision of screen.More optimizing, is as shown in Figure 8 c, and the marginal ray 817 of the marginal ray 816 of the first output light and the second output light is more approaching, all approaches the place between the eyebrows position between two of observer K simultaneously.Such the first output light has covered left eye 843a equally, the second output light has covered right eye 843b equally, therefore the 3D visual effect of observer K is constant, but like this for the status requirement of observer K, and the requirement of the machining precision of screen all greatly reduced, System Error-tolerance Property has improved.Certainly, the marginal ray 817 of the marginal ray 816 of the first output light and the second output light can overlap, and now System Error-tolerance Property is best.

The light of the output light shown in Fig. 8 a to Fig. 8 c distributes, and different from shown in Fig. 1 and Fig. 2 be no longer the light of a specific direction for the output light of each position on screen, but one have the light beam of certain angle scope.But in the explanation of the embodiment shown in Fig. 3 a to Fig. 7, all for exit direction how to control output light, how to realize the output light of the light of a specific direction, this class output light that certainly can meet Fig. 1 and Fig. 2 representative distributes, but but can not directly realize the light distribution of the output light shown in Fig. 8 a to Fig. 8 c.

In fact, can control output light in the technical foundation of specific direction outgoing (being multiple technical schemes of Fig. 3 a to Fig. 7 representative), be the requirement that easily realizes output light and have a special angle scope.For example use scattering layer, this scattering layer can be positioned over any position in light and screen effect light path, also can be combined as a whole with screen, and its combination has had above to be described and gives an example.The effect of this scattering layer is that it acts on as shown in Figure 9 by the scattered beam centered by the light scattering Cheng Yiyuan specific direction of specific direction.Fig. 9 is the schematic diagram that is related to of light intensity before and after light scattering and angle, wherein curve 911 is sharp-pointed, it represents the light along specific direction, and the curve of this light after certain scattering is 912, visible 912 representatives be a light beam of propagating centered by former radiation direction, its angular range depends on the degree of scattering, and more severe this angular range of scattering is larger.As can be seen here, export light along specific direction outgoing by control, add the scattering degree (for example, by controlling the parameter such as refractive index, concentration and granularity of scattering particles) of controlling scattering layer, just can control the shooting angle scope of final output light.

, there is a problem in the method for controlling the shooting angle scope of output light by the light of specific direction transmission is carried out to scattering.As the light distribution curve 912 after the scattering in Fig. 9, its angular range can be controlled, but is more difficult in the control of this scope inner curve form (being light distribution).For example distribute 912 for light, presented the light distribution characteristics after obvious scattering, i.e. bell-shaped distribution.There is long hangover 912a on two borders in this distribution.Want to realize the light that edge is precipitous and distribute, use the method for general scattering to be difficult to accomplish.

A kind of solution is, uses micro-cylindrical lens array or microlens array to carry out scattering to light and can obtain the scattering that certain light intensity distributes, and this light distribution designs relevant with micro-cylindrical mirror or lenticular type.This is prior art, does not do too much introduction herein.

Below in conjunction with the another kind of method that realizes certain output light shooting angle scope of Figure 10 a to Figure 10 c explanation.Look back the method for controlling emergent light angle in Fig. 5 e, wherein, by controlling the normal direction of first micro-504a and second micro-504b, can control the exit direction of the first emergent light 511a and the second emergent light 512a.Figure 10 a to Figure 10 c gives an example to carry out improved three using Fig. 5 e as prototype.

In Figure 10 a, what the triangle of dotted line represented is the microstructure in Fig. 5 e, and wherein lines 504a and 504b represent respectively former first micro-and former second micro-transversal on left and right directions.In the present embodiment, first micro-transversal on left and right directions is curve 1004a, and second micro-transversal on left and right directions is curve 1005a.Be appreciated that the first input light 1021a is incident in namely the first output light of reflected light 1011a(after first micro-1004a) no longer only have unique exit direction, but the light that is incident in diverse location has different reflection directions; Same, the second input light 1022a is incident in namely the second output light of reflected light 1012a(after second micro-1005a) neither only have unique exit direction, but the light that is incident in diverse location has different reflection directions.Therefore as long as control first micro-and the curved-surface shape of second micro-of microstructure, the light that just can control output light is distributed as specific distribution.Specifically, near first micro-1004a position and former first micro-504a microstructure top is basically identical, and the output of first in the light 1011a-1 being reflected by this part and Fig. 5 e light 511a is same direction.More away from the top of microstructure, it just more curves inwardly with respect to former first micro-504a for first micro-1004a, this shooting angle that causes the light 1011a-2 being reflected by first micro-1004a middle part with respect to light 1011a-1 more away from the normal direction of screen, by the shooting angle of first micro-1004a bottom reflection light 1011a-3 out with respect to light 1011a-2 more away from the normal direction of screen.Be appreciated that due to first micro-1004a it is the curved surface of the gradual change initial with being shaped as of former first micro-504a, therefore the first output light 1011a be exactly take former the first output light 511a as marginal ray to the light beam away from screen normal Directional Extension.The method for designing of second micro-1005a is identical therewith.This method is applicable to produce the photodistributed screen design of Fig. 8 a to Fig. 8 c; It is worthy of note, this method is specially adapted to Fig. 8 b and Fig. 8 c is this for example, at least one marginal ray (marginal ray 816 and 817) the exigent situation of angle.

From illustrating above, the distribution of the first output light 1011a is relevant with the shape of first micro-1004a, can control accordingly the distribution of the first output light 1011a to the suitable design of first micro-1004a shape.Same, the design of the shape to second micro-1005a can be controlled the distribution of the second output light 1012a.

In this is given an example, first micro-1004a and second micro-1005a are continually varyings, and in fact continuous curve surface is not easy processing, therefore can be similar to the splicing of multistage normal direction continually varying plane.

Example shown in Figure 10 b is identical with the object that Figure 10 a reaches, and difference is, first micro-1006a is not continuous, but indention.Each sawtooth has a face towards input light, and the continuous variation of the normal direction of these faces makes to export light and realizes specific distribution.

Example shown in Figure 10 c is identical with the object that Figure 10 a reaches, but in the example shown in Figure 10 c, former microstructure (triangle shown in dotted line) is replaced by multiple sub-microstructure, every sub-microstructure can both rely on two micro-input reflection of light of facing to control output direction of light, but each micro-output direction of light producing is different and variation continuously, so just can realize the specific distribution of output light.

Be appreciated that, although Figure 10 a to Figure 10 c improves for the microstructure in Fig. 5 e, but this just for example, practically identical method also can be applied to other embodiments of the invention, as long as pass through to control microstructure in this embodiment, prism unit, the shape of reflector element etc. is controlled output direction of light, just further application drawing 10a or Figure 10 b improving one's methods to Fig. 5 e, by changing microstructure, prism unit, the surface configuration of reflector element is controlled the distribution of output light, or application drawing 10c improves one's methods to Fig. 5 e structure, by using multiple different sub-microstructures, sub-prism, the as a whole distribution of controlling output light of sub-reflector element.Further, Figure 10 a to Figure 10 c improves one's methods, and also can be combined with scattering phase to realize the angle control of output light.

Shown in Figure 11 is that the photodistributed another kind of output is given an example, and it is a kind of modified to Fig. 2.During light shown in Fig. 2 distributes, left eye 241, the second output light that the first output light is incident in observer are incident in same observer's right eye 242; This makes except this observer, and 3D rendering all can not be watched in other position.Light shown in Figure 11 distributes and has solved this problem, and it can make can see 3D rendering in two orientation before screen 1101.In the projection display system of Figure 11, there are two observers, left eye and right eye that the first observer's left eye and right eye are expressed as 1141 and 1142, the second observers are expressed as 1143 and 1144.Only discrete two bundles of first of outgoing the output on optional position on screen 1101, be incident in respectively the first observer and the second observer's left eye, and on screen 1101 on optional position second of outgoing output light be also two discrete bundles, be incident in respectively the first observer and the second observer's right eye.Such the first observer and the second observer just can see 3D rendering.

As seen from the above description, on screen 201 in Fig. 2, the emergent light of optional position is light or a light beam with specific exit direction, different with it, in Figure 11, on screen 1101, the emergent light of optional position is discrete two light or light beams with different specific exit directions.Realize this effect of screen 1101, only need to improve previously described Screen Technology.

Still take the embodiment of Fig. 5 e as example, there are discrete two functions with the light of different specific exit directions by the screen construction of Fig. 5 e being improved achieve.As Figure 12 a and Figure 12 b be exactly to two of Fig. 5 e kinds improved for example.In Figure 12 a, first micro-face becomes by two fritter plane 1204a-1 and 1204a-2 with different normal directions and is spliced.The first input light 1221a is incident in the surface of fritter plane 1204a-1 and 1204a-2, the first observer's left eye 1141 can be made to be incident in from the first output light 1211a-1 of its surperficial outgoing by controlling the normal direction of fritter plane 1204a-1, the second observer's left eye 1143 can be made to be incident in from the first output light 1211a-2 of its surperficial outgoing by controlling the normal direction of fritter plane 1204a-2 simultaneously.Same, second micro-1105a is also spliced by two fritter planes with different normal directions, and the second input light 1222a is incident in these two fritter planes; Can control two discrete bundle the second output light 1212a of formation and be incident in respectively the first observer's right eye 1142 and the second observer's right eye 1144 by controlling the normal direction of these two fritter planes.

Screen microstructure shown in Figure 12 b is actually the one distortion of Figure 12 a.Divide other to combine to form two sub-microstructures that independently adjoin each other two fritter planes of two the fritter plane 1204a-1 of first micro-1204a in Figure 12 a and 1204a-2 and second micro-1205a, the face towards the first input light of each sub-microstructure is identical with fritter plane 1204a-1 and 1204a-2 respectively.Be appreciated that this little microstructure does as a wholely, can reach like this technique effect same with the screen microstructure of Figure 12 a.

Be appreciated that in Figure 12 a and Figure 12 b only there to be two observers to give an example before screen.In the same way, if there be n observer to exist, for the screen microstructure of Figure 12 a, each micro-just need to be spliced by n different fritter plane of normal direction, this slightly face correspond respectively to n observer; And for the screen microstructure of Figure 12 b, just needing n adjacent variform sub-microstructure, the micro-face in each microstructure corresponds respectively to n observer.

Be appreciated that, Figure 12 a, although Figure 12 b improves for the microstructure in Fig. 5 e, but this just for example, practically identical method also can be applied to other embodiments of the invention, as long as pass through to control microstructure in this embodiment, prism unit, the shape of reflector element is controlled output direction of light, just further application drawing 12a improving one's methods to Fig. 5 e structure, by changing microstructure, prism unit, the shape of reflector element is controlled the distribution of output light, or application drawing 12b improves one's methods to Fig. 5 e structure, by using multiple different sub-microstructures, sub-prism, the as a whole distribution of controlling output light of sub-reflector element.

By herein, a summary is carried out in the distribution of the output light that we can protect the present invention.Fig. 1 and Fig. 2 have described output the simplest photodistributed form, and from screen, arbitrarily the first output light of some outgoing and the second output light are respectively the light beam of a branch of specific direction.Fig. 8 a to Fig. 8 c has described the photodistributed another kind of form of output, and from screen, arbitrarily the first output light of some outgoing and/or the second output light have a specific angular range, particularly preferably is that in this angular range, to export the light distribution of light controlled.Figure 12 a and Figure 12 b have described photodistributed the third form of output, and from screen, the first output light of any some outgoing and the second output light are respectively n (n is not less than 2) and restraint light beam discrete, different directions outgoing.

These the three kinds photodistributed forms of output all can realize, and this is passing through introduction detailed in enforcement above.And these the three kinds photodistributed forms of output are all to have its important using value.Be appreciated that the second and the third export photodistributed form and can mix use, the first output light and/or the second output light can also be that n(n is not less than 2) restraint discrete beamlet, each beamlet has a specific angular range.Mix and use the second and the third output light distribution can obtain such practical effect: before screen, have two or more positions to have 3D visual effect, 2D image can be watched in other position simultaneously.Above these output light are distributed and carry out a summary, and exporting exactly light distribution needs to meet following condition, belongs to exactly protection scope of the present invention:

Observer is in the time watching on screen 1 A, in whole horizontal view angle scope, certainly exist not overlapping the first angular field of view and the second angular field of view mutually, in the first angular field of view, can see that the first output light just looks at less than the second output light, in the second angular field of view, can see that the second output light just looks at less than the first output light.

In the above description, take two bundle output light as for example, in fact also can the method according to this invention realize the more output light of multi beam.Those skilled in the art, according to description of the invention, easily obtain the multi beam output projection display system of light and the method for designing of screen in the same way.

The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes instructions of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims

1. a projection display system, is characterized in that:

Comprise a projection light source and a screen, the input light projection that projection light source penetrates is in screen surface, this input light is divided into the first input light and the second input light according to the difference of particular optical attribute, the first input light is different with the image that the second input light carries, and from projection light source while or timesharing ejaculation;

Described screen comprises prism array, on the different first surface of two normal directions of prism array and second surface, be respectively with the first filter coating and the second filter coating, the first filter coating casts out in the mode of refraction or reflection the first input light that is incident in first surface form the first output light of screen, to be incident in the second input light absorption of first surface or lead the side of the first output light outgoing dorsad toward prism array simultaneously, the second filter coating casts out in the mode of refraction or reflection the second input light that is incident in second surface form the second output light of screen, to be incident in the first input light absorption of second surface or lead the side of the second output light outgoing dorsad toward prism array simultaneously,

The first output light and the second Output of laser have different exit directions, make in the time watching on screen 1 A, in whole horizontal view angle scope, certainly exist not overlapping the first angular field of view and the second angular field of view mutually, in the first angular field of view, can see that the first output light just looks at less than the second output light, in the second angular field of view, can see that the second output light just looks at less than the first output light.

2. projection display system according to claim 1, it is characterized in that, described first surface and second surface are two faces in a prism unit in prism array, or first surface and second surface are respectively the corresponding surfaces in two prism unit in prism array.

3. projection display system according to claim 1, is characterized in that:

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

Described the first filter coating comprises first group of three high permeability wave band, corresponds respectively to blueness, green and red wave band, and these three wave bands are corresponding to three primary colours of the first input light institute load image; Described the second filter coating comprises second group of three high permeability wave band simultaneously, corresponds respectively to blueness, green and red wave band, and these three wave bands are corresponding to three primary colours of the second input light institute load image; Wherein first group and second group of high permeability wave band mutually intersect on wavelength;

Or described the first filter coating comprises first group of three high reflectance wave band, corresponds respectively to blueness, green and red wave band, these three wave bands are corresponding to three primary colours of the first input light institute load image; Described the second filter coating comprises second group of three high reflectance wave band simultaneously, corresponds respectively to blueness, green and red wave band, and these three wave bands are corresponding to three primary colours of the second input light institute load image; Wherein first group and second group of high reflectance wave band mutually intersect on wavelength.

4. projection display system according to claim 1, is characterized in that, described screen described prism array dorsad a side of the first output light and the second output light exit direction also comprise absorption layer.

5. according to the projection display system described in any one in claim 1 to 4, it is characterized in that:

Described prism array comprises at least one prism, at least one surface of this prism is curved surface or is spliced by multiple fritter planes with different normal directions, makes the first output light and/or the second output direction of light that penetrate from this prism be distributed as predetermined distribution;

Or, described prism array comprises n adjacent sub-prism, n is more than or equal to 2, this n sub-prism is for projecting the normal direction difference of corresponding flat of the first output light and/or the second output light, makes this n sub-prism make as a whole the first projected output light and/or the second output direction of light is distributed as predetermined distribution.

6. according to the projection display system described in any one in claim 1 to 5, it is characterized in that,

Described the first angular field of view be positioned at from screen A point to the line direction of observer's place between the eyebrows with left angular field of view, and observer's left eye drops in the first angular field of view; Described the second angular field of view be positioned at A point on screen to the line direction of observer's place between the eyebrows with right angular field of view, and observer's right eye drops in the second angular field of view;

Meanwhile, the image that the first input light carries is the left-eye image during 3D shows, the image that the second input light carries is the eye image during 3D shows.

7. according to the projection display system described in any one in claim 1 to 5, it is characterized in that, in whole horizontal view angle scope, also comprise the 3rd angular field of view between the first angular field of view and the second angular field of view, in the 3rd angular field of view, can see the first output light and the second output light simultaneously.

8. according to the projection display system described in any one in claim 1 to 7, it is characterized in that, described screen also comprises scattering layer, and this scattering layer is independent of other element of screen or a part for other element.

9. projection display system according to claim 8, is characterized in that, described scattering layer scattering angle is in the horizontal direction less than the scattering angle at vertical direction.

10. projection display system according to claim 9, is characterized in that, described scattering layer comprises multiple cylinders or the cylinder that array arrangement or spuious along continuous straight runs of arranging extend.