CN2824079Y

CN2824079Y - Large screen image seamless splicing display

Info

Publication number: CN2824079Y
Application number: CN 200520057771
Authority: CN
Inventors: 孟凡华; 张晓琪; 梁明浩; 白宝国
Original assignee: WEICHUANGRIXIN ELECTRONIC CO Ltd GUANGDONG
Current assignee: Vtron Technologies Ltd
Priority date: 2005-04-30
Filing date: 2005-04-30
Publication date: 2006-10-04
Anticipated expiration: 2015-04-30

Abstract

The utility model discloses a seamless large screen image splicing display device, which comprises a large screen and at least two projectors for splicing and projecting in parallel a large picture on the large screen. Sub-images projected by every two adjacent projectors are superposed at marginal connecting parts; the superposed regions have the same picture contents; a luminance modulation element for causing the luminance in the superposed region to achieve smooth transition is arranged in an imaging light path of the superposed region at the projection margin of every projection lens. The utility model realizes the real seamless large screen splicing display, and ensures the high luminance and the high resolution of large screen display and no pixel loss.

Description

The large-screen image seamless splicing display device

Technical field

The utility model relates to a kind of large screen display device.Especially a kind of seamless image splicing display device.

Background technology

Existing projective large-screen demonstration normally adopts following three kinds of methods to realize: first kind is to use projector's (as 200 cun) on a giant-screen of single high brightness output to project a width of cloth complete image, the general projection distance of this method is distant, and bigger space requirement is arranged; On the other hand, because the resolution of unit is limited, when throwing bigger picture, it is thicker that pixel becomes, and image resolution ratio is low.Because with the very big picture of unit projection, brightness also is difficult to guarantee.Second kind is to adopt optics to fight recklessly resolution and the brightness that the mode that connects improves large screen display, promptly on single giant-screen, use a plurality of projectors to carry out the splicing projection of optical imagery, each projector's image projected is that the edge overlaps, closely get together between the image, constitute a complete picture.This method can realize very high resolution on a complete giant-screen, but because the brightness of each projector weakens from the center to the edge gradually, and in place that different projectors projects images is connected, the radiation direction that projects on the screen is completely different, because the optical characteristics of screen decision itself, the place that makes image be connected is seen in different directions, brightness between the image has very big difference, significantly fracture sense appears in the place that the sudden change of this brightness makes image be connected, and has destroyed the integrality of image.Add the distortion of projected image, edge of image is connected and also is difficult to eliminate the slit.The third is to adopt multi-unit assembled form to constitute giant-screen, there is projector and the projection screen of oneself each unit, use Fresnel Lenses to improve the homogeneity of Dan Ping behind each screen, the mode of piling up by machinery forms the capable mosaic display screen of M row N then, this mosaic display screen can show a complete image, also can be on whole mosaic screen position windowing arbitrarily.This method can realize very high resolution on giant-screen, but because seam existence machinery and optics is arranged between each unit, can destroy the whole structure of image.Although because technologic updating, piece is also done more and more forr a short time, and piece exists all the time, and visual still obviously have a seam.

The utility model content

The purpose of this utility model is to provide a kind of large-screen image seamless splicing display device, can adopt a plurality of projectors to realize the real seamless spliced demonstration of giant-screen, guaranteed the high brightness and the high resolving power of large screen display, and exhausted existence of seamless and losing of pixel.

The utility model is achieved by the following technical programs: a kind of large-screen image splicing display device, comprise a giant-screen and at least two projectors that are used on giant-screen, splicing side by side the big picture of projection one width of cloth, the subimage that each adjacent projections machine projects is overlapping in the linking marginal portion, this overlapping region has identical picture material, is provided with the brightness that is used to make in the overlapping region and reaches the intensification modulation element that seamlessly transits in the imaging optical path in each projection lens projects imbricate zone.

Described intensification modulation element is the opaque thin slice of one deck edge-smoothing at least, when using the opaque thin slice of multilayer edge-smoothing they be separated by straggly be arranged in step-like.

Described intensification modulation element is the opaque thin plate of toothed edge, the rectangle that is shaped as straight flange of its toothed edge, trapezoidal, triangle or curve; The size of sawtooth is much smaller than the emergent pupil size of optical lens.When using the opaque thin slice of multilayer toothed edge they be separated by straggly be arranged in step-like; The opaque thin plate of described toothed edge can be shaken in the serrate plane or rotate, to produce softer luminance transition effect.

Described modulator element is the right cylinder of band rib; The described right cylinder of modulating rib that has can rotate around axis, to produce effect of uniform more.

Described intensification modulation element is the transparent substrate that is provided with the shading coating, and the coating on the transparent substrate is corresponding to the light path part of overlapping region.

The utility model compared with prior art has following advantage:

1, can provide real seamless high resolving power and high brightness large screen display.

2, owing to adopt overlapping mode of delivery, tiled display is lost without any pixel.

3, adopt the excellent luminance modulator approach, realize the perfect luminance transition of overlapping region.

4, adopting the utility model to provide does not have the large-screen splicing of image fracture sense to show fully.

Description of drawings

Fig. 1 is that the dual-projection machine that produces the doubling of the image splices synoptic diagram on a giant-screen;

Fig. 1 a is a middle projects images brightness curve shown in Figure 1;

Fig. 2 adopts optical modulation to carry out the synoptic diagram that doubling of the image regional luminance is regulated;

Fig. 2 a is middle projects images imaging optical path figure shown in Figure 2;

Fig. 2 b is a middle projects images brightness curve shown in Figure 2;

Fig. 3 a, Fig. 3 b, Fig. 3 c, Fig. 3 d are the element that is applied to optical modulation;

Fig. 4 a, Fig. 4 b are the synoptic diagram that optical modulation component moves;

Fig. 5 provides multilayer modulation thin slice to carry out the schematic diagram of optical modulation;

Fig. 6 is tubular optical modulation component action principle figure.

Embodiment

Fig. 1 showed and adopts two projectors 11,12 to carry out the situation of image mosaic on a giant-screen, unlike previous technologies be that these two images that projector projected have lap.Two number of sub images 13a and 13b about the processor that utilization has a plurality of graphic presentation output channels will picture displayed be divided into, this two number of sub images has an overlapping region 13c in the contiguous place that is connected, and shows and the identical content of image right left hand edge part having a regional 13c with marginal portion that image right 13b is connected mutually as left-side images 13a among the figure.Left-side images 13a and image right 13b be content 13c.There is an overlapped zone in two projectors in the border projection scope that overlaps when the same picture of splicing projection, to guarantee that adjoining image repeats display part 13c and can accurately overlap mutually.

Throw simultaneously by two projectors at overlapping view field's image, therefore the brightness 14c of its image approximately is other not twice of overlapping region brightness 14a, 14b, as shown in Figure 1a, for the brightness of image that realizes the overlapping region is consistent with other parts brightness, must adopt the method for brightness regulation to make the brightness even transition of image.

Projector for technology such as at present popular DLP, LCD and LCOS, because optical element and video picture chip The noise, they can not provide the details in a play not acted out on stage, but told through dialogues of zero luminance, even the luminance signal of input picture is zero, they also have certain brightness existence, as 0.5lux, therefore, a constant brightness stack can occur in the overlapping region, form the bright band in the details in a play not acted out on stage, but told through dialogues in the overlapping region, adopt the method for optical brightness modulation to address this problem well.

As shown in Figure 2, left-side images 23a is having an overlapping region 23c with marginal portion that image right 23b is connected mutually among the figure, projection lens in the

projector

21,22 of throwing stitching image has been placed the

optical modulation component

26,27 that is used for intensification modulation in the imaging optical path separately, projects the light energy distribution of overlapping region 23c on the screen with change.This intensification modulation element is determined the distance of placing by the optical characteristics of projection lens, and modulator element is the opaque thin slice of given shape.The principle of work of optical modulation sheet is blocked and can not be passed through through a part of modulated element 26 of the imaging light of camera lens 28 emergent pupils shown in Fig. 2 a, and as the A point of image border among Fig. 2 a, its imaging light all is blocked, and does not therefore have light to arrive screen; Another part is as near some C point of picture centre, then all by projecting on the screen; And those pixels between A point and C point, a part of light has passed through the arrival screen, and another part is blocked and can not passes through, as B point among Fig. 2 a.Therefore on projected image, form the effect of brightness gradual change, shown in curve D among Fig. 2 a.The shape of curve D is relevant with the optical characteristics of camera lens, can not be linear generally, therefore, uses opaque modulation sheet can't produce uniform luminance transition merely.As described in Fig. 2 b, the brightness of stitching image still can exist the brightness shown in 24c among the figure to raise in overlapping areas.

Can improve the more even of overlapping region brightness of image by the design that changes optical modulation component, as adopting the jagged opaque thin plate shown in Fig. 3 a, Fig. 3 b, Fig. 3 c, the shape of its sawtooth can be the triangle of straight flange or trapezoidal, also can be bent limit shape, the size of sawtooth be much smaller than the emergent pupil size of optical lens.As Fig. 3 d can also be partially transparent or the complete opaque pattern shading coating that adopts physical method to form on transparent thin slice, and the coating on the transparent sheet is corresponding to the light path part of overlapping region.In order to improve the homogeneity of brightness, optical modulation component can be shaken in the serrate plane or rotate, to produce softer luminance transition effect, shown in Fig. 4 a, Fig. 4 b.

Optical modulation component can be the thin plate of individual layer, also can be the composite wafer discharging of being separated by, and forms in picturesque disorder structure.As shown in Figure 5, the modulator element that this double-deck thin slice 56,56a form can make the evenly level and smooth more of luminance transition owing to can block respectively by the light that in picturesque disorder ledge structure is launched different angle to camera lens 58.Also the composite wafer composite component can be transformed the cylindrical form of making, formation has the right cylinder of modulating rib, as shown in Figure 6, and to produce more reasonably shape of structure; This right cylinder 66 of modulating rib that has can rotate around axis, and the modulation right cylinder of rotation is because the motion of rib, is engraved in the variation when stopping the position that camera lens 68 launches light, can produce the intensification modulation effect of uniform and delicate more.

The brightness of image of overlapping region is regulated and also can be regulated by the mode of electronics, with the gain adjusting circuit in the signal process processor of each subimage, with the gain of pairing each pixel in overlapping region according to linearity or nonlinear rules regulate, the change of gain produces the variation of respective pixel brightness, brightness by pixel or collection of pixels in each subimage in the change overlapping region realizes that each projector's output image brightness in the overlapping region seamlessly transits.

Claims

1, a kind of large-screen image seamless splicing display device, comprise a giant-screen and at least two projectors that are used on giant-screen, splicing side by side the big picture of projection one width of cloth, it is characterized in that: the subimage that each adjacent projections machine projects is overlapping in the linking marginal portion, this overlapping region has identical picture material, is provided with the brightness that is used to make in the overlapping region and reaches the intensification modulation element that seamlessly transits in the imaging optical path in each projection lens projects imbricate zone.

2, large-screen image seamless splicing display device according to claim 1 is characterized in that: described intensification modulation element is the opaque thin slice of one deck edge-smoothing at least, the opaque thin slice of edge-smoothing be separated by straggly be arranged in step-like.

3, large-screen image seamless splicing display device according to claim 1 is characterized in that: described intensification modulation element is the opaque thin plate of band toothed edge, the rectangle that is shaped as straight flange of its toothed edge, trapezoidal, triangle or curve; The size of sawtooth is much smaller than the emergent pupil size of optical lens; The opaque thin slice of a plurality of band toothed edges be separated by straggly be arranged in step-like.

4, large-screen image seamless splicing display device according to claim 3 is characterized in that: described intensification modulation element is the opaque thin plate of the band toothed edge that can shake or rotate in the profile of tooth plane.

5, large-screen image seamless splicing display device according to claim 1 is characterized in that: described modulator element is the right cylinder of band rib.

6, large-screen image seamless splicing display device according to claim 5 is characterized in that: the described modulator element that has rib is can be around the right cylinder of axis rotation.

7, large-screen image seamless splicing display device according to claim 1 is characterized in that: described intensification modulation element is the transparent substrate that is provided with the shading coating, and the coating on the transparent substrate is corresponding to the light path part of overlapping region.