CN103809357A

CN103809357A - Screen and projection display system

Info

Publication number: CN103809357A
Application number: CN201310462397.1A
Authority: CN
Inventors: 吴震
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-09-16
Filing date: 2013-10-08
Publication date: 2014-05-21

Abstract

The invention provides a screen used for reflecting an image projected by a projector and to the surface of the screen to enable audiences to see the image. The screen comprises a micro prism array. Each micro prism in the micro prism array comprises a first surface plated with a reflection film, and the first surface is used for receiving a part of image light emitted to the surface and reflecting the light to form the emitted light of the micro prism. For the image light projected from the projector at the first specific position, the emitted light of each micro prism is collected at the second specific position. A projection display system is further provided. The screen further comprises a projector located at the first specific position of the screen. By means of the screen, the projector is arranged at the first specific position of the screen, the screen can reflect all light projected by the projector to the second specific position to avoid light dispersion, and people can see the high-brightness image as long as the eyes are located nearby the second specific position.

Description

Screen and projection display system

Technical field

The present invention relates to display technique field, particularly relate to the projection display system of a kind of screen and this screen of use.

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.The form of in general just throwing is at present many.

There is in the market the product of micro-projection, by projection microminiaturization, even integrated with mobile devices such as mobile phones.Such benefit is obviously portable, but that problem is miniature projection brightness is very low, can not meet general application.Current solution is the luminosity of the micro-projection products of lifting of effort, but the resistance running into is technically very large, even if improved brightness, because will become bottleneck the cruising time of the very large battery of power consumption simultaneously.

Summary of the invention

The present invention proposes a kind of screen, thereby makes spectators see image for projector being projected to its surperficial image light reflection.This screen comprises microprism array, and the microprism in microprism array comprises the first surface that is coated with reflectance coating, and this first surface is for receiving the emergent light that is irradiated to its surperficial parts of images light and is reflected to form this microprism.For the image light casting out from the projector of the first ad-hoc location, the emergent light of each microprism converges at the second ad-hoc location.

The present invention also proposes a kind of projection display system, and above-mentioned screen also comprises projector, and projector is positioned at the first ad-hoc location of screen.

The screen that utilizes the present invention to propose, projector is placed in to the first ad-hoc location of screen, thereby all light that this screen just can cast out projector all trend of purchasing second ad-hoc location of orientation have been avoided dispersing of light, as long as human eye is watched the image that just can see high brightness near this second ad-hoc location.

Accompanying drawing explanation

Fig. 1 is an embodiment of the principle of work of screen in the present invention;

Fig. 2 be screen in Fig. 1 embodiment front elevation for example;

Fig. 3 be screen in Fig. 1 embodiment another front elevation for example

Fig. 4 is the structural representation that in Fig. 1 embodiment, screen has used scattering layer;

Fig. 5 is the one distortion of the screen construction shown in Fig. 4;

Fig. 6 is a kind of structural representation of scattering layer;

Fig. 7 is the structural representation of another embodiment of the present invention;

Fig. 8 a is the three-dimensional view of the microprism of pyramid;

Fig. 8 b is the vertical view of pyramid microprism;

Fig. 8 c is the schematic diagram of the microprism array that forms of multiple pyramid microprisms;

Fig. 9 a is the schematic diagram of the principle of work of the microprism of curved surface;

Fig. 9 b is the schematic diagram that multiple sub-microprisms are made as a whole principle of work;

Fig. 9 c is the principle of work schematic diagram that has the microprism that multiple facets are spliced.

Embodiment

The structure of the first embodiment of screen of the present invention as shown in Figure 1.Screen comprises substrate 101 and microprism array, and this microprism array comprises a series of microprisms, and the microprism 102,103 and 104 shown in figure is several giving an example wherein.It should be noted that, that in figure, for convenience of description the relative size of microprism is drawn is very large, and in reality, its size with respect to whole screen is very little.

In the present embodiment, the light (image light) of image information that what projector 121 sent be loaded with is radiated on whole screen, and the luminous of projector 121 illustrate with light 161,163 and 165, and screen reflexes to these image light in beholder 141 eyes.

Describe as an example of the microprism 102 that is positioned at screen top example.Microprism 102 comprises the first surface 102a that is coated with reflectance coating, and this first surface 102a is for receiving the emergent light 162 that is irradiated to its surperficial parts of images light 161 and is reflected to form this microprism 102.Being appreciated that the shape of controlling microprism 102, is the normal direction of controlling first surface 102a specifically, just can control the exit direction of this emergent light 162, makes it be incident in beholder 141 glasses.

Same reason, be positioned at the microprism 103 and the microprism 104 that is positioned at screen middle part of screen below, also can be by controlling its shape, be reflected into respectively the parts of

images light

163 and 165 and form

emergent light

164 and 166 that is mapped to their surfaces, these

emergent lights

164 and 166 are incident in respectively beholder 141 glasses.

Therefore in the present embodiment, the effect of the microprism of the diverse location on screen is, the image light casting out from the projector that is positioned at the first ad-hoc location is reflected to form to emergent light separately, and these emergent lights converge at second ad-hoc location at beholder place.Like this, complete scattering with respect to traditional screen to incident image light, in the present embodiment, as long as beholder watches at the second ad-hoc location, most of image light just can converge in beholder's eyes, and its brightness of watching will be far above the brightness that uses conventional screen.

Fig. 2 is the front elevation of screen in the present embodiment, and wherein each in many parallel lines (lines 202 be wherein the example of) represents a seamed edge of the microprism of a bar shaped, and this seamed edge is also a limit of the first surface of this microprism.Visible, in the present embodiment, the microprism of bar shaped extends along the horizontal direction of screen, and the xsect of each microprism is a triangle, on the Jiu Leng limit, summit of this triangle outside screen.Each microprism is arranged along screen vertical direction, and the shape of each microprism is different.In the present embodiment, preferred, between each microprism, be compact arranged, can farthest utilize like this area of screen to raise the efficiency.

In embodiment shown in Fig. 1 and Fig. 2, there is a problem: the microprism extending along screen level direction can be controlled the shooting angle of emergent ray on the above-below direction of screen, but be difficult to control the shooting angle of light on screen left and right directions.As shown in Figure 2, projector is positioned at the middle part of screen to example, and the image light 261 that it sends is incident in the right side of the some microprisms on screen, and reflected light 262 must be outgoing to the right; Meanwhile, another beam images light 263 that projector sends is incident in the left side of the some microprisms on screen, and reflected light 264 must be outgoing to the left.Like this

reflected light

262 and 264 on left and right directions, be difficult to realize converge.In order to address this problem, screen also comprises scattering layer, as shown in Figure 4.In Fig. 4, in substrate 401, there is microprism array 402, be coated with reflection horizon on microprism array 402 surfaces, such as but not limited to being coated with aluminium reflection horizon.On microprism array 402, also comprise scattering layer 403, the image light of projector projection is first incident in scattering layer scattering once, is that after prism array 402 reflects, in scattering layer, scattering is once again.Can make like this emergent light of microprism on left and right directions, be scattered as sizable angular range.In this case, the region that the emergent light 262 in Fig. 2 and emergent light 264 will exist irradiating angle to intersect, this region is exactly second ad-hoc location at beholder place.If

emergent light

262 and 264 scattering degree is in the horizontal direction larger, the two region crossing will present the bar shaped of along continuous straight runs, this bar shaped scope is exactly the second ad-hoc location of this screen, and observer can see the image of high brightness within the scope of this.

In the embodiment shown in fig. 4, scattering layer 403 had both played the effect of scattered light, also played the effect in the reflection horizon of protection microprism array 402 plated surfaces simultaneously.The implementation method of this scattering layer has multiple, for example for example, in transparent material (organic glass PMMA or PC), surpass the molecule into different refractivity, again for example in the first surface of transparent material surface or microprism (can be in fact any one surface in the light path of screen reflection light) the regular or irregular minute protrusions of upper processing or depression, this is all proven technique, does not repeat herein.

In the embodiment shown in fig. 4, although introducing scattering layer 403 can solve light and be difficult in the horizontal direction the problem crossing, but scattering too seriously can significantly reduce the brightness of watching, therefore preferred, scattering layer has selectivity to the scattering of light, and the scattering angle in screen level direction is greater than the scattering angle of in the vertical direction.Still scattering is less in the vertical direction like this, and (as shown in Figure 1) concentrated and converged to light in the vertical direction, now can obtain the image of high brightness.Find through calculating inventor, the scattering half-angle of scattering layer on screen vertical direction is 30 while spending, screen of the present invention just has the luminance gain of 4 times with respect to conventional screen, therefore as long as the scattering half-angle of scattering layer on screen vertical direction is not more than 30 degree, just can guarantee to obtain the image of suitable brightness.

In order to realize selectively scattering, Fig. 6 has provided a kind of signal of method.In Fig. 6,603 is scattering layer, and there is scattering microstructure 603a on scattering layer 603 surfaces, and this microstructure 603a is the cylinder extending along vertical paper direction, has only drawn the xsect of this cylinder in figure.In Fig. 6, illustrate the first surface of some microprisms with plane 602.For this small part of screen, the image light 661 that projector casts out and 663 is almost parallel, this two-beam is incident in the first surface 602 of microprism after the transmission of microstructure 603a, by its reflection after again by microstructure 603a transmission, shooting angle on the bearing of trend perpendicular to microstructure 603a has and is no longer parallel but has an angle, the still keeping parallelism of shooting angle on the bearing of trend that is parallel to microstructure 603a simultaneously the two bundle emergent lights 662 that now form with 664.Therefore, the microstructure 603a of cylinder has just realized the scattering in horizontal direction in Fig. 6 and has not caused in the scattering of vertically facing directly in direction simultaneously, has realized the selectivity of scattering.

Therefore, be greater than the scattering angle of in the vertical direction in order to realize scattering angle in screen level direction, scattering layer can comprise array arrangement or the spuious multiple cylinders that extend along screen vertical direction of arranging.The xsect of its central column face can be a part for circle or original shape, can be also oval or other shape, can be even irregular shape.On the other hand, mix cylinder in transparent material, cylinder is also array arrangement or spuiously arranges and extend along screen vertical direction, can realize equally the object of selectivity scattering.

In the embodiment shown in Figure 2, because microprism is to make light shooting angle in the horizontal direction be difficult to control along the bar shaped in screen level direction, except using scattering layer to solve this problem, can also use the microprism that bearing of trend is arc to solve this problem, as shown in Figure 3.Fig. 3 is the example of the another kind of front elevation of screen in the embodiment shown in Fig. 1.Wherein each in multiple lines (the 302nd, one of them is given an example) represents a seamed edge of the microprism of a bar shaped, and this seamed edge is also a limit of the first surface of this microprism.The bearing of trend of the microprism of visible bar shaped is curved, and the two ends of this arc are to the lower end bending of screen, and each microprism is arranged along screen vertical direction.Projector 321 is positioned at the middle part of screen, the image light 361 that it sends is incident in the right side of some microprisms, because microprism is decurved in this position, converge at reflected light 362 shooting angle Ye Shixiang center in the horizontal direction, on screen, the emergent light of diverse location can converge to center like this, and finally converges in the second ad-hoc location of screen.

Be appreciated that in the embodiment shown in fig. 3, can use equally scattering layer, scattering layer now can be isotropic scattering layer, can be also scattering layer selectively as described above.Use the benefit of scattering layer to be, on screen, the emergent light of each position has certain angle of divergence, the second ad-hoc location is not now just a point but a region, each point in this region can be seen the emergent light of each position on screen, beholder is just freer in the time watching like this, and viewing effect is insensitive to the slight variation of viewing location.

In the above-described embodiments, microprism array is all the side towards incident light in substrate, in fact also can have other structure, as shown in Figure 5.The difference of the structure shown in the structure shown in Fig. 5 and Fig. 1 is, microprism array 502 is directly processed on the surface of scattering layer 501, and scattering layer 501 has served as the effect of substrate simultaneously, and microprism array 502 is positioned at a side of the incident light dorsad of scattering layer (substrate).In this embodiment, in order to protect the reflection horizon for prism array 502 surfaces, also comprised protective seam 503.

In the embodiment shown in Fig. 1 and Fig. 5, have a common ground: the microprism of screen below is low on lower height, the microprism of screen top is that upper height bends down.Specifically, the microprism of screen bottom is more on the upper side to the reflection direction of incident light with respect to whole screen plane to inciding its surperficial reflection of light direction, and the microprism on screen top is more on the lower side to the reflection direction of incident light with respect to whole screen plane to inciding its surperficial reflection of light direction.Wherein whole screen plane refers to screen and makes as a whole plane.For the application of micro-projection, the position (the first ad-hoc location of screen) at micro-projector place is general concordant with the lower limb of screen, and the position at observer's glasses place (the second ad-hoc location of screen) is generally at first half of screen or exceed the first half, this just requires the microprism of screen bottom that the incident light (as the image light 163 in Fig. 1) that almost horizontal direction is come is upwards reflected, and therefore the microprism of screen bottom is more on the upper side to the reflection direction of incident light with respect to whole screen plane to inciding its surperficial reflection of light direction.

And another kind of situation is, the placement of screen itself can have an inclination angle, as shown in Figure 7.In Fig. 7, screen top recedes, and it is stable that screen relies on support 702 to support maintenance.Now microprism array 701 has just presented the form different from microprism array in Fig. 1.In Fig. 7, the microprism of screen bottom and the microprism on top are all that upper height bends down, this is because of the inclination due to screen, whole screen plane just can upwards reflex to the incident ray of almost horizontal in human eye, and therefore the microprism of screen bottom not quite even also can be on the lower side to the reflection direction variation of incident light with respect to whole screen plane to inciding its surperficial reflection of light direction.Be appreciated that preferably the elevation angle of screen can regulate, the second ad-hoc location of screen will be followed the adjusting at the elevation angle and be moved up and down like this, and this facilitates beholder to find most suitable viewing location.

In fact to be no matter the prism array shown in the prism array shown in Fig. 1 or Fig. 7, the top from screen bottom to screen, the variation of microprism all presents the process of " microprism bottom step-down gradually, microprism top uprises gradually ".

In the above-described embodiments, microprism is all bar shaped, and the microprism of multiple bar shapeds is put formation microprism array side by side.In fact microprism can also be pyramid, and a two-dimensional array of microprism composition of multiple pyramids forms microprism array jointly.As shown in Figure 8 a, its vertical view as shown in Figure 8 b for the schematic perspective view of the microprism of pyramid.Wherein 801 represent a microprism, 801a represents the first surface of this microprism.Identical with the principle of work of above-described microprism, by controlling the shape of microprism, namely control the normal direction of the first surface 801a of microprism, can control outgoing direction of light.Array of the interlaced composition of microprism in Fig. 8 b forms microprism array, as shown in Figure 8 c.In Fig. 8 c, below space between two microprisms, have the microprism in the middle of their being positioned at below to fill up, make all light effectively to control and to utilize.

In above embodiment, the first surface of all microprisms is all a plane, is expressed as in the drawings straight line.But, if first surface is processed into curved surface, can obtain better effect.As shown in Fig. 9 a.In Fig. 9 a, illustrate the sectional view of a bar shaped microprism, the straight line above the transversal of the first surface that wherein curve 902 is microprism described in embodiment, and straight dotted line 901 represents the transversal of the first surface of the plane described in embodiment above.For the part at a microprism place, the image light of incident is close to directional light, the directional light that light 961 to 965 these five light are incident for example.Wherein, the image light 963 of incident is incident in the middle part of first surface 902, and identical with the normal direction of the first surface 901 of embodiment midplane above in the normal direction of this position first surface 902, the emergent light of reflection is light 968.If according to embodiment above, all reflected light of the first surface of plane all have the exit direction the same with light 968, but the embodiment shown in application drawing 9a is different.

For example, light 962 is incident in position on the lower side, microprism middle part, and this position normal direction changes with respect to middle part, direction ratio light 968 outgoing more on the lower side of its reflected light 967; Same, light 961 is incident in the position of microprism bottom, and its reflected light 966 is more on the lower side than the direction of reflected light 967.As a same reason, light 964 is incident in position on the upper side, microprism middle part, and this position normal direction changes with respect to middle part, direction ratio light 968 outgoing more on the upper side of its reflected light 969; Same, light 965 is incident in the position of microprism bottom, and its reflected light 970 is more on the upper side than the direction of reflected light 969.Like this, be to be no longer just a branch ofly close to parallel light, but on the above-below direction of screen, have certain angle of divergence from the reflected light of first surface 902, the size of the angle of divergence determines by the design of first surface, and the more angle of divergence of first surface bending is larger.

Utilize the method for the microprism of the first surface with curved surface of the present embodiment, a branch of parallel incident image light can be become to an emergent light with certain dispersion angle, its effect is equivalent to scattering, but more easily controls than scattering.Be appreciated that, if first surface is bent upwards at upper and lower, be equivalent to the scattering on above-below direction, if first surface is bent upwards the scattering being equivalent on screen left and right directions at the right and left of screen, if on this both direction, bending simultaneously produces dispersion effect on both direction, and the degree of scattering can be controlled by the degree of crook in this direction by first surface simultaneously.For example, want to realize the angle of divergence in screen level direction and be greater than the angle of divergence on screen vertical direction, just separately first surface degree of crook is in the horizontal direction greater than the degree of crook of its in the vertical direction.

In addition, first surface bending can also combine with scattering layer above-mentioned.For example microprism is only bent upwards at the upper and lower of screen, controls the dispersion angle of emergent light on above-below direction with this.Be combined with optionally scattering layer, this scattering layer only carries out scattering to light in the horizontal direction but vertical direction is not had scattering process or only has faint scattering process simultaneously.In this case, because the scattering degree of two dimensions can be controlled respectively, the control of the dispersion angle of the emergent light to microprism will be more accurate like this.

In the embodiment shown in Fig. 9 a, the first surface of microprism be curved surface in fact first surface also can be spliced by the fritter plane with different normal directions, make the emergent light of this microprism there is predetermined light distribution, as shown in Fig. 9 c, wherein the first surface of microprism has three different fritter planes 921,922 and 923 of normal direction to be spliced, be similar to a continuous curved surface with this, its effect is also similar to continuous curved surface.

Further, microprism shown in Fig. 9 c can also be deformed into three sub-microprisms as shown in Fig. 9 b, these three sub-microprisms have respectively the first surface of oneself, the normal direction of its first surface is separately different, wherein the normal direction of first surface 924 is identical with the method phase direction of the fritter plane 921 in Fig. 9 c, the normal direction of first surface 925 is identical with the method phase direction of the fritter plane 922 in Fig. 9 c, and the normal direction of first surface 926 is identical with the method phase direction of the fritter plane 923 in Fig. 9 c.Also identical with Fig. 9 c of the angle of divergence that each sub-microprism shown in Fig. 9 b is made as a whole emergent light like this, has predetermined light and distributes.Certainly, three sub-microprisms in Fig. 9 b, and three fritter planes in Fig. 9 c are all that concrete quantity is not construed as limiting, as long as be more than or equal to 2 for example.

In the present invention, screen is tender texture, can make like this it can be curling and be convenient for carrying.Screen may be also hard ground, is spliced by polylith sub-screen, is stacked together and is convenient for carrying thereby can split in not using.

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 screen, thus make spectators see image for projector being projected to its surperficial image light reflection, it is characterized in that:

Comprise microprism array, the microprism in microprism array comprises the first surface that is coated with reflectance coating, and this first surface is for receiving the emergent light that is irradiated to its surperficial parts of images light and is reflected to form this microprism;

For the image light casting out from the projector of the first ad-hoc location, the emergent light of each microprism converges at the second ad-hoc location.

2. screen according to claim 1, is characterized in that:

Described microprism is bar shaped, extends along screen level direction, and each microprism is arranged along screen vertical direction; Or,

Described microprism is bar shaped, and its bearing of trend is curved, the horizontal direction that the tangential direction of this arc core is screen, and the two ends of this arc are to the lower end bending of screen, and each microprism is arranged along screen vertical direction; Or,

Described microprism array is a two-dimensional array, wherein microprism be shaped as pyramid.

3. screen according to claim 1, it is characterized in that, the microprism of screen bottom is more on the upper side to the reflection direction of incident light with respect to whole screen plane to inciding its surperficial reflection of light direction, and the microprism on screen top is more on the lower side to the reflection direction of incident light with respect to whole screen plane to inciding its surperficial reflection of light direction.

4. screen according to claim 1, is characterized in that, also comprises scattering layer, and this scattering layer is independent of other element of screen or a part for other element, and the scattering half-angle of this scattering layer on screen vertical direction is not more than 30 degree.

5. screen according to claim 3, is characterized in that, the scattering angle of described scattering layer in screen level direction is greater than the scattering angle of in the vertical direction.

6. screen according to claim 4, is characterized in that, described scattering layer comprises array arrangement or the spuious multiple cylinders or the cylinder that extend along screen vertical direction of arranging.

7. screen according to claim 1, is characterized in that:

The first surface of described microprism is curved surface or is spliced by multiple fritter planes with different normal directions, makes the emergent light of this microprism have predetermined light distribution;

Or described microprism comprises n adjacent sub-microprism, n is more than or equal to 2, and the normal direction of the first surface of sub-microprism is different, makes this n sub-microstructure make as a whole emergent light and has predetermined light distribution.

8. screen according to claim 1, is characterized in that, screen is that tender texture makes it can be curling; Or screen is hard ground, is spliced by polylith sub-screen.

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

Comprise the screen described in any one in claim 1 to 8, also comprise projector, projector is positioned at the first ad-hoc location of described screen.

10. projection display system according to claim 9, is characterized in that, the elevation angle of screen can regulate.