CN111918042A

CN111918042A - Projector and projection system

Info

Publication number: CN111918042A
Application number: CN201910379293.1A
Authority: CN
Inventors: 李晓平
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2019-05-08
Filing date: 2019-05-08
Publication date: 2020-11-10

Abstract

The embodiment of the invention discloses a projector and a projection system, and relates to the technical field of projectors. The method is used for solving the problem of poor display such as image distortion and the like of a projection picture caused by a large fusion area in the projection system of the related art. The projector comprises a projection lens and a curved surface reflector, wherein the curved surface reflector is positioned on the light emitting side of the projection lens, a projection light beam emitted by the projection lens is reflected by the curved surface reflector and then emitted from the projector to form a projection light path, the curved surface reflector comprises a reflection area, the reflection area is an area formed by projecting the projection light beam onto the curved surface reflector, the projector further comprises a light attenuation piece, the light attenuation piece is positioned on the projection light path between the projection lens and the reflection area, and the light attenuation piece is positioned on the projection light path corresponding to the edge area of the reflection area. The invention can be used in tiled projection systems.

Description

Projector and projection system

Technical Field

The invention relates to the technical field of projectors, in particular to a projector and a projection system.

Background

With the rapid development of projection technology, the application of the projection seamless splicing fusion technology is generated. The projection seamless splicing and fusing technology is that edge fusion is carried out on projection pictures thrown by two or more projectors, and finally, a whole picture without gaps, larger picture and higher resolution ratio is formed on a projection screen. The splicing and fusion of the projection pictures is of great importance, and the display quality of the projection pictures is directly related.

The related technology provides a splicing and fusion scheme of a projection picture, namely a scheme of a splicing and fusion device is adopted, the splicing and fusion device can be used for segmenting a projection image, then an image fusion area is generated, the image fusion area is processed through geometric correction and color correction, and finally a complete picture is formed on a projection screen.

However, as shown in fig. 1, a splicing fusion device is used for fusion, and 20% of the area of each projection area 01 (i.e., the projection area a1 A2A3 a4, the projection area B1B2B 3B 4, the projection area C1C 2C 3C 4, and the projection area D1D 2D 3D 4) is required for fusion, so that display defects such as distortion and the like are easily generated in the projection image in the image fusion area 02 (the shaded area in the drawing), and the display quality of the projection image is reduced; in addition, the cost of the tiled fuser is relatively expensive, and the use of a tiled fuser increases the cost of the projection system.

Disclosure of Invention

Embodiments of the present invention provide a projector and a projection system, which are used to solve the problem of poor display, such as image distortion, of a projection image caused by a large fusion region in a projection system in the related art.

In order to achieve the above object, in a first aspect, an embodiment of the present invention provides a projector, including a projection lens and a curved surface reflector, where the curved surface reflector is located on a light exit side of the projection lens, a projection light beam emitted by the projection lens is reflected by the curved surface reflector and then emitted from the projector to form a projection light path, the curved surface reflector includes a reflection area, the reflection area is an area formed by projecting the projection light beam onto the curved surface reflector, the projector further includes a light attenuation element, the light attenuation element is located on the projection light path between the projection lens and the reflection area, and the light attenuation element is located on the projection light path corresponding to an edge area of the reflection area.

In a second aspect, an embodiment of the present invention provides a projection system, which includes a projection screen and a plurality of projectors, where projection light beams emitted by the plurality of projectors can all be incident on the projection screen to form a plurality of projection areas, the plurality of projection areas correspond to the plurality of projectors one to one, edges of two adjacent projection areas overlap to form an image fusion area, at least one of the projectors corresponding to the two adjacent projection areas is a local brightness adjustment projector, the local brightness adjustment projector is the projector in the first aspect, and a projection light path where a light attenuation element of the local brightness adjustment projector is located corresponds to the image fusion area.

The projector and the projection system provided by the embodiment of the invention have the advantages that the projector also comprises the light attenuation element which is positioned on the projection light path corresponding to the edge area of the reflection area, so that the position of the light attenuation element is reasonably arranged, the projection light path where the light attenuation element is positioned corresponds to the image fusion area on the projection screen, the brightness of the image fusion area can be reduced to be equal to or similar to that of other areas through the attenuation of the light attenuation element to the brightness of the light, the problem of bright lines formed by the superposition of the brightness of the image fusion area can be solved, a splicing fusion device is not needed, the cost of the projection system can be reduced, the width of the image fusion area of two adjacent projection areas can be designed to be small, the image fusion area can be positioned outside the effective display area, and the influence of the overlarge image fusion area on the size and analysis of a projection picture can be avoided, thereby ensuring the display quality of the projection picture.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a diagram illustrating an image fusion area on a projection screen according to the related art;

FIG. 2 is a schematic structural diagram of a projector according to an embodiment of the invention;

FIG. 3 is a schematic view of a projector with a top cover and a light attenuating element removed according to an embodiment of the present invention;

FIG. 4 is an optical path diagram of a projection beam from a projector in an embodiment of the present invention;

FIG. 5 is a schematic view of a projection system in some embodiments of the invention (four projection zones merged, two projectors upside down);

FIG. 6A is a schematic side view of FIG. 5 (without the light attenuating element);

FIG. 6B is a top view of FIG. 5 (without the light attenuating element);

FIG. 7 is a schematic diagram of the arrangement of light attenuating elements in the projector corresponding to the four projection zones in FIG. 5 (the black dots in the diagram are the areas where some of the projection beams intersect on the convergence plane, and the shaded areas in the diagram a are the areas where the projection beams intersect on the convergence plane;

FIG. 8 is a schematic view of a projection screen of a projection system in some embodiments of the invention (two projection zones are merged);

FIG. 9 is a schematic view of one arrangement of light attenuating elements in the projector corresponding to the two projection areas of FIG. 8;

FIG. 10 is a schematic view of an alternative arrangement of light attenuating elements in the projector corresponding to the two projection areas of FIG. 8;

FIG. 11 is a schematic view of a projection screen of a projection system in some embodiments of the invention (nine projection zones fused);

FIG. 12A is a schematic side view of a projection system according to some embodiments of the invention (nine projection zones merge, light attenuating elements are not shown);

FIG. 12B is a top view of a projection system in some embodiments of the invention (without the light attenuating element);

FIG. 13 is a schematic diagram of the arrangement of light attenuating elements in the projector corresponding to the nine projection zones of FIG. 11 (the black dots in the figure are the areas where some of the projected light beams intersect on the convergence plane);

FIG. 14 is a cross-sectional view of a light attenuating element in some embodiments of the present invention;

FIG. 15 is a cross-sectional view of a light attenuating element in accordance with further embodiments of the present invention;

FIG. 16 is a schematic view of a projection screen of a projection system in some embodiments of the invention (six projection zones fused);

fig. 17 is a schematic diagram of the arrangement of light attenuating elements in the projector corresponding to the six projection zones of fig. 16 (the black dots in the figure are the areas where some of the projection beams intersect on the convergence plane).

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

The inventor of the invention learns that the scheme adopting the splicing fusion device in the related technology is analyzed, the fusion area adopting the scheme adopting the splicing fusion device is larger, and for a projector (especially an ultra-short-focus projector), the size and the analysis of a projection picture are ensured to be unchanged under any use condition in an image fusion area with a larger area (because the picture size of a projection lens is slightly changed during the working period, and the directions of the size changes of the pictures projected by two adjacent projectors are different, so that the corresponding images of two adjacent projectors in the image fusion area are staggered, the analysis is not good, namely the projection picture is ensured not to be distorted, and the difficulty is higher; if the image fusion area is reduced to enable the image fusion area to only occupy a small size range, the problem of projection image distortion caused by the fact that the image fusion area is too large can be well solved, however, the splicing fusion device cannot be used due to the fact that the width of the image fusion area is too small, if the splicing fusion device is not adopted, two adjacent projection images cannot be well fused, bright lines can be generated in the image fusion area (due to the fact that the brightness of the two projection images in the image fusion area is overlapped), and the display effect of the projection images is seriously affected. Based on the analysis, the light attenuation element is arranged on the projection light path corresponding to the image fusion area of the projector to attenuate the brightness of light, so that the problem of bright lines caused by brightness superposition is solved, a splicing fusion device is not needed, the image fusion area can be reduced to a small size range, even an effective display area is not occupied, and the problem of projection image distortion caused by a large image fusion area in the related technology is solved.

In a first aspect, an embodiment of the present invention provides a projector, as shown in fig. 2 and fig. 3, including a projection lens 1 and a curved surface reflector 2, where the curved surface reflector 2 includes a light exit side located on the projection lens 1, and as shown in fig. 4, a projection light beam emitted by the projection lens 1 is reflected by the curved surface reflector 2 and then exits from the projector to form a projection light path 3; the curved surface reflecting mirror 2 includes a reflecting area 21, the reflecting area 21 is an area formed by projecting the projection light beam onto the curved surface reflecting mirror 2, as shown in fig. 4 and 7, the projector further includes a light attenuating element 4, the light attenuating element 4 is located on the projection light path 3 between the projection lens 1 and the reflecting area 21, and the light attenuating element 4 is located on the projection light path 3 corresponding to an edge area of the reflecting area 21.

The light attenuating element 4 is located on the projection light path 3 between the projection lens 1 and the reflection area 21, because the projection light beam emitted by the projection lens 1 can be better converged between the projection lens 1 and the reflection area 21, the light attenuating element 4 is located at this position, the projection light path 3 where the light attenuating element 4 is located can accurately correspond to the image fusion area 220 on the projection screen 200, if the light attenuating element 4 is located elsewhere, the light spot is large due to poor convergence of the projection light beam, and is overlapped with the projection light beam corresponding to each position on the projection screen 200, so that the projection light path 3 where the light attenuating element 4 is located is difficult to correspond to the image fusion area 220, and the brightness of the area outside the image fusion area 220 on the projection screen 200 is reduced.

In the projector provided by the embodiment of the present invention, because the projector further includes the light attenuating element 4, the light attenuating element 4 is located on the projection light path 3 corresponding to the edge region of the reflection region 21, so that the projection light path 3 where the light attenuating element 4 is located corresponds to the image fusion region 220 on the projection screen 200 by reasonably arranging the position of the light attenuating element 4, so that the brightness of the light by the light attenuating element 4 can be reduced to the brightness equal to or similar to that of other regions, and thus the problem of bright lines formed by the image fusion region 220 due to the superposition of brightness can be solved, so that a splicing fusion device is not needed, not only the cost of the projection system can be reduced, but also the width of the image fusion region 220 of two adjacent projection regions 210 can be designed to be small (for example, the width of 1-2 cm, within the size of a text display range), therefore, the problem of distortion of the projection picture caused by the overlarge image fusion area 220 can be avoided, and the display quality of the projection picture can be ensured.

In the above embodiments, the light attenuating element 4 is not disposed at a unique position, for example, as shown in fig. 4, the light attenuating element 4 may be located at the convergence of the projection light beams, such as the light attenuating element 4 is located on the convergence plane 5 of the projection light beams. In addition, the light attenuating element 4 may be located at a position offset from the convergence of the projection light beam. Compared with the light attenuating element 4 which is located at a position deviated from the convergence of the projection light beams, when the light attenuating element 4 is located at the convergence of the projection light beams, the influence between the projection light beams corresponding to the positions on the reflection area 21 is minimal, and the light attenuating element 4 is arranged at the position, so that the light attenuating element 4 can be ensured to be more accurately located on the projection light path 3 corresponding to the edge area of the reflection area 21, the light attenuating element 4 can be better prevented from being located on the projection light path 3 corresponding to other areas of the reflection area 21, and the light attenuating element 4 can be better prevented from attenuating the brightness of the area outside the image fusion area 220 on the projection screen 200.

In the projector provided by the embodiment of the present invention, there are many setting modes of the light attenuating element 4, including at least the following setting modes:

fig. 7 (a) and (d) show a first arrangement of the light attenuating element 4, in which the light attenuating element 4 includes a second light attenuating element 42 and a fourth light attenuating element 44, the second light attenuating element 42 being located on the projection optical path 3 corresponding to the lower side edge region of the reflection area 21, and the fourth light attenuating element 44 being located on the projection optical path 3 corresponding to the right side edge region of the reflection area 21;

in this arrangement, the second and fourth

optical attenuators

42 and 44 may be provided separately or integrally, and are not particularly limited herein.

Fig. 7 (b) and (c) show a second arrangement of the light attenuating element 4, in which the light attenuating element 4 includes a second light attenuating element 42 and a third light attenuating element 43, and the third light attenuating element 43 is located on the projection light path 3 corresponding to the left edge region of the reflection area 21;

in this arrangement, the second and third

optical attenuators

42 and 43 may be provided separately or integrally, and are not particularly limited herein.

The projectors adopting the first and second setting manners as shown in fig. 5 and fig. 6A can be applied to a projection system in which four projection areas 210 are arranged in a2 × 2 array, and the number of the projectors is four and the projectors are all placed on the viewing side of the projection screen 200.

Fig. 13 (a) shows a third arrangement of the light attenuating element 4, in which the light attenuating element 4 includes a first light attenuating element 41 and a fourth light attenuating element 44, and the first light attenuating element 41 is located on the projection light path 3 corresponding to the upper edge region of the reflection region 21;

in this arrangement, the first optical attenuator 41 and the fourth optical attenuator 44 may be provided separately or integrally, and are not particularly limited herein.

Fig. 13 (c) shows a fourth arrangement of the optical attenuation element 4, in which the optical attenuation element 4 includes a first optical attenuation element 41 and a third optical attenuation element 43;

in this arrangement, the first optical attenuator 41 and the third optical attenuator 43 may be provided separately or integrally, and are not particularly limited herein.

Fig. 13 (b) shows a fifth arrangement of the optical attenuation element 4, in which the optical attenuation element 4 includes a first optical attenuation element 41, a third optical attenuation element 43, and a fourth optical attenuation element 44;

in this arrangement, the first, third and fourth

optical attenuators

41, 43 and 44 may be provided separately or integrally, and are not particularly limited herein.

Fig. 13 (e) shows a sixth arrangement of the optical attenuation element 4, in which the optical attenuation element 4 includes a first optical attenuation element 41, a second optical attenuation element 42, and a fourth optical attenuation element 44;

in this arrangement, the first, second and fourth

optical attenuators

41, 42 and 44 may be provided separately or integrally, and are not particularly limited herein.

Fig. 13 (g) shows a seventh arrangement of the optical attenuation element 4, in which the optical attenuation element 4 includes a first optical attenuation element 41, a second optical attenuation element 42, and a third optical attenuation element 43;

in this arrangement, the first, second and third

optical attenuators

41, 42 and 43 may be provided separately or integrally, and are not particularly limited herein.

Fig. 13 (i) shows an eighth arrangement of the optical attenuation element 4, in which the optical attenuation element 4 includes a second optical attenuation element 42, a third optical attenuation element 43, and a fourth optical attenuation element 44;

in this arrangement, the second, third and fourth

optical attenuators

42, 43, 44 may be provided separately or integrally, and are not particularly limited herein.

Fig. 13 (f) shows a ninth arrangement of the optical attenuation element 4, in which the optical attenuation element 4 includes a first optical attenuation element 41, a second optical attenuation element 42, a third optical attenuation element 43, and a fourth optical attenuation element 44;

in this arrangement, the first, second, third and fourth

optical attenuators

41, 42, 43 and 44 may be provided separately or integrally, and are not particularly limited herein.

The projectors adopting the third to ninth configurations described above, as shown in fig. 11 and 12A, may be applied to a projection system in which the number of the projectors is nine, and the projectors are arranged in a3 × 3 array, and are all placed on the back side of the projection screen.

Fig. 9 (a) shows a tenth arrangement of the optical attenuation element 4, in which the optical attenuation element 4 includes a third optical attenuation element 43;

fig. 9 (b) shows an eleventh arrangement of the light attenuating element 4, in which the light attenuating element 4 includes a fourth light attenuating element 44;

the projectors adopting the tenth and eleventh setting manners as described above may be applied to a projection system in which the number of the projectors is 2 and the projectors are all placed on the viewing side of the projection screen 200, and the projection area 210 is two and is arranged in a1 × 2 (row × column) array, as shown in fig. 8.

The projector provided by the embodiment of the invention can specifically adjust the arrangement mode of the light attenuation element 4 according to the projection system applied to the projector. The projectors adopting the first to fourth setting modes have good universality and wide application, and can be applied to a front projection system (as shown in fig. 7) in which 2n projection areas 210 are arranged in a2 × 2 array, or a rear projection system (as shown in fig. 13) in which nine projection areas 210 are arranged in a3 × 3 array.

In the projector provided in the embodiment of the present invention, the first light attenuating element 41 may be entirely located on the projection light path 3 corresponding to the upper side edge region of the reflection region 21, or may be partially located on the projection light path 3 corresponding to the upper side edge region of the reflection region 21, which is not specifically limited herein; the second light attenuating element 42 may be entirely located on the projection light path 3 corresponding to the lower side edge region of the reflection region 21, or may be partially located on the projection light path 3 corresponding to the lower side edge region of the reflection region 21, which is not specifically limited herein; the third light attenuating element 43 may be entirely located on the projection light path 3 corresponding to the left edge region of the reflection region 21, or partially located on the projection light path 3 corresponding to the left edge region of the reflection region 21, which is not specifically limited herein; the fourth light attenuating element 44 may be located entirely on the projection light path 3 corresponding to the right edge region of the reflective region 21, or may be located partially on the projection light path 3 corresponding to the right edge region of the reflective region 21, which is not particularly limited herein.

It should be noted that: "left" and "right" in the left and right side edge regions of the reflection region 21 of the first (1) curved mirror 2 are defined with a direction pointing from the back side to the front side of the curved mirror 2 as a viewing direction (for example, the G1 direction in fig. 3 and 6A) when the projector 100 is being placed (for example, as shown by the first projector 111 and the second projector 112 located below in fig. 5). The first projector 111 and the second projector 112 shown in fig. 7 (a) and (b) are placed upside down, and therefore, the first projector 111 and the second projector 112 shown in fig. 7 (a) and (b) are just opposite to "left" and "right" in the first projector 111 and the second projector 112 shown in fig. 7 (c) and (d);

(2) the upper and lower edge regions of the reflection region 21 of the curved mirror 2 are also defined when the projector 100 is in a state of being placed, and therefore, the first and second projectors 111 and 112 shown in (a) and (b) of fig. 7 are also exactly opposite to the "upper and lower" regions of the first and second projectors 111 and 112 shown in (c) and (d) of fig. 7, viewed from the same viewing direction (e.g., the direction of G1 in fig. 6A);

(3) "left" and "right" on projection screen 200 are defined with a direction that is located on the viewing side of projection screen 200 and toward projection screen 200 as a viewing direction (e.g., the direction of G2 in fig. 5 and 6A), such as shown in fig. 5;

the reflection area 21 of the second curved reflector 2 can reflect the projection light beam emitted by the projection lens 1 to the projection area 210 of the projection screen 200, and there is a certain corresponding relationship between the light reflected by different positions of the reflection area 21 and the position of the projection area 210:

(1) for a projector 100 being placed, such as the projector 100 located below in fig. 5 and 6A, the light reflected by the upper side edge region of the reflection region 21 corresponds to the lower edge region of the projection region 210, and the light reflected by the lower side edge region of the reflection region 21 corresponds to the upper edge region of the projection region 210; for an upside-down projector 100, such as the projector 100 located above in fig. 5 and 6A, the light reflected by the upper side edge region of the reflection region 21 corresponds to the upper edge region of the projection region 210, and the light reflected by the lower side edge region of the reflection region 21 corresponds to the lower edge region of the projection region 210;

(2) for projector 100 placed on the viewing side of projection screen 200, as shown in fig. 6B, light reflected by the left edge region of reflection area 21 corresponds to the right edge region of projection area 210, and light reflected by the right edge region of reflection area 21 corresponds to the left edge region of projection area 210; for the projector 100 placed on the rear side of the projection screen 200, as shown in fig. 12B, the light reflected by the left edge area of the reflection area 21 corresponds to the left edge area of the projection area 210, and the light reflected by the right edge area of the reflection area 21 corresponds to the right edge area of the projection area 210.

In the projector provided by the embodiment of the invention, the light transmittance of the light attenuation element 4 can be constant; in addition, the light transmittance of the light attenuating element 4 may also be varied, and as shown in (c) of fig. 4 and 7, the transmittance of the light attenuating element 4 gradually increases in a direction (for example, X direction in fig. 4) perpendicular to the optical axis 6 of the projection lens 1 and away from the optical axis 6 of the projection lens 1. Compared with the embodiment in which the light transmittance of the light attenuating element 4 is constant, the embodiment in which the light transmittance of the light attenuating element 4 is varied (the embodiment shown in fig. 4 and 7) can adjust the light transmittance of the light attenuating element 4 according to the variation of the intensity of the brightness of the projection light beam at different positions corresponding to the reflection regions 21 (the brightness of the projection light beam is smaller as the distance from the optical axis 6 of the projection lens 1 is farther as shown in (c) of fig. 7), the brightness of the projection light beam is smaller at a position farther from the optical axis 6 of the projection lens 1, the light transmittance of the light attenuating element 4 at the position is set larger, the excessive attenuation of the brightness of the projection light beam can be avoided, the brightness of the projection light beam is smaller at a position closer to the optical axis 6 of the projection lens 1, the light transmittance of the relatively large light attenuating element 4 at the position is set smaller, the brightness difference between the projection light beam at the position and the projection light beam at other positions can be reduced, thereby ensuring the uniform brightness of the projection light beam emitted by the projection lens 1 and further ensuring the uniform brightness of the image on the projection screen 200.

In the projector according to the embodiment of the present invention, the light attenuating element 4 is not unique in structural shape, for example, as shown in fig. 7, the light attenuating element 4 may be a light attenuating sheet. In addition, the light attenuating element 4 may also be a light attenuating rod. Compared with the light attenuation rod, the light attenuation sheet occupies smaller space, so that the projector can be more compact in structure.

The structure of the light attenuation sheet is not exclusive, and for example, the light attenuation sheet may be a structure including a light-transmitting plate 43 and a light attenuation film 44, and the light attenuation film 44 covers both side surfaces (may be one side surface) of the light-transmitting plate 43 along the thickness direction of the light-transmitting plate 43, as shown in fig. 14. As shown in fig. 15, the light attenuation sheet may have the following structure: the light attenuation sheet comprises a first substrate 45, a second substrate 46 and an electrochromic material layer 49, wherein a first electrode 47 and a second electrode 48 are respectively arranged on the opposite surfaces of the first substrate 45 and the second substrate 46, and the electrochromic material layer 49 is clamped between the first electrode 47 and the second electrode 48. When the electrochromic device works, an electric field is applied between the first electrode 47 and the second electrode 48, and the color of the electrochromic material layer 49 is changed under the driving of the electric field, so that the light transmittance is changed, and the light is attenuated to a certain extent. Compared with the embodiment that the light attenuation sheet comprises the first substrate 45, the second substrate 46 and the electrochromic material layer 49, in the embodiment that the light attenuation sheet comprises the substrate 43 and the light attenuation film 44, the structure of the light attenuation sheet is simpler, power does not need to be supplied, not only can the consumption of electric energy by the light attenuation sheet be avoided, but also the reliability of the operation of the light attenuation sheet can be improved.

In the embodiment where the light attenuation sheet includes the light-transmitting plate 43 and the light attenuation film 44, the light attenuation film 44 may be a light absorption film, and the transmittance of the light absorption film can be changed by adjusting the thickness of the light absorption film, for example, the thickness of the light absorption film can be gradually changed, so that the transmittance of different areas of the light attenuation sheet can be changed; the light-transmitting plate 43 may be a glass substrate or a resin substrate, and is not particularly limited herein. The thickness of the light-transmitting substrate 43 may be less than 2 mm.

In an embodiment where the light attenuation sheet includes the first substrate 45, the second substrate 46, and the electrochromic material layer 49, the first electrode 47 may be provided in plurality, the plurality of first electrodes 47 are all opposite to the second electrode 48, and the first electrodes 47 are respectively located at different positions of the first substrate 45. Therefore, different voltages can be applied to different first electrodes 47, so that the colors of the electrochromic material layers 49 at different positions can be changed, and further the transmittance at different positions can be changed, thereby realizing the change of the transmittance of the light attenuation sheet.

In the projector provided by the embodiment of the present invention, the difference between the attenuation amounts of the light attenuating element 4 to the light in different bands (for example, the bands 440 to 645nm used by the laser projector) should be less than or equal to 2%, so that the attenuation degrees of the light attenuating element 4 to the light in different bands are similar, thereby avoiding the color distortion of the picture put into the image fusion area 220 by the projector due to the excessive absorption of the light attenuating element 4 to the light in a certain band (for example, green light, corresponding to wavelengths 492 to 577 nm).

In the projector provided by the embodiment of the present invention, the projection lens 1 may be an ultra-short-focus projection lens 1.

In a second aspect, an embodiment of the present invention provides a projection system, as shown in fig. 5 and fig. 6A, including a projection screen 200 and a plurality of projectors 100, where projection light beams emitted by the plurality of projectors 100 are incident on the projection screen 200 to form a plurality of projection areas 210, the plurality of projection areas 210 correspond to the plurality of projectors 100 one to one, edges of two adjacent projection areas 210 are overlapped to form an image fusion area 220, at least one of the projectors 100 corresponding to the two adjacent projection areas 210 is a local brightness adjustment projector 110, the local brightness adjustment projector 110 is the projector 100 described in the first aspect, and a projection light path 3 where a light attenuation element 4 of the local brightness adjustment projector 110 is located corresponds to the image fusion area 220 (as shown in fig. 6A and fig. 7).

In the projection system provided by the embodiment of the present invention, at least one of the plurality of projectors 100 is the local brightness adjustment projector 110, and the projection optical path 3 where the light attenuation element 4 of the local brightness adjustment projector 110 is located corresponds to the image fusion area 220, so that, during operation, the light attenuation element 4 can attenuate the brightness of the image fusion area 220 to eliminate the bright lines of the image fusion area 220, and ensure better fusion of the images of two adjacent projection areas 210, and thus, a splicing fusion device is not needed, the width of the image fusion area 220 of two adjacent projection areas 210 can be designed to be small, and the image fusion area 220 can be located outside the effective display area, so that image distortion caused by an excessively large image fusion area 220 can be avoided, and the display quality of the projection image can be ensured.

The arrangement mode of the projection system provided by the embodiment of the invention is not unique, and at least comprises the following arrangement modes:

FIGS. 5, 6A, and 7 illustrate a first arrangement of a projection system in which the projection regions 210 are four in number and arranged in a2 × 2(2 for rows and 3 for columns) array; the number of the projectors 100 is four, and all the projectors are local brightness adjusting projectors 110, and the four local brightness adjusting projectors 110 are two first projectors 111 and two second projectors 112, respectively, and are all located on the viewing side of the projection screen 200 (i.e., in a front projection manner);

in the two first projectors 111, the light attenuating elements 4 are arranged as follows: as shown in fig. 7 (a) and (d), the light attenuating element 4 includes a second light attenuating element 42 and a fourth light attenuating element 44, that is: the light attenuating elements 4 are located on the projection light path corresponding to the lower and right side edge regions of the reflective region 21, and as shown in fig. 5 and 6A, one first projector 111 is placed upside down and corresponds to the upper left projection region 210 of the projection screen 200, and the other first projector 111 is placed right and corresponds to the lower right projection region 210 of the projection screen 200;

in the two second projectors 112, the light attenuating elements 4 are arranged as follows: as shown in (b) and (c) of fig. 7, the light attenuating element 4 includes a second light attenuating element 42 and a third light attenuating element 43, that is: the light attenuating elements 4 are each positioned in the projection light path corresponding to the lower and left edge regions of the reflective region 21, and, as shown in fig. 5 and 6A, one of the second projectors 112 is positioned upside down and corresponds to the upper right projection region 210 of the projection screen 200, and the other second projector 112 is positioned right and corresponds to the lower left projection region 210 of the projection screen 200.

FIGS. 16 and 17 illustrate a second arrangement of projection systems in which the projection areas 210 are six in number and arranged in a 2X 3(2 for rows and 3 for columns) array; the number of the projectors 100 is six, and all the projectors 110 are local brightness adjusting projectors 110, and the six local brightness adjusting projectors 110 are two first projectors 111, two second projectors 112, and two third projectors 113, respectively, and are located on the viewing side of the projection screen 200 (i.e., in a front projection manner);

as shown in fig. 16 and 17 (a), one first projector 111 is placed upside down and corresponds to the leftmost projection area 210 of the first row of the projection screen 200, and as shown in fig. 16 and 17 (f), the other first projector 111 is placed and corresponds to the rightmost projection area 210 of the second row of the projection screen 200; the first row projection area 210 and the second row projection area 210 of the projection screen 200 are sequentially arranged in a top-to-bottom direction.

As shown in fig. 16 and 17 (c), one second projector 112 is placed upside down and corresponds to the rightmost projection area 210 of the first row of the projection screen 200, and as shown in fig. 16 and 17 (d), the other second projector 112 is placed and corresponds to the leftmost projection area 210 of the second row of the projection screen 200.

As shown in fig. 16 and 17 (b), one third projector 113 is placed upside down and corresponds to the projection area 210 in the middle of the first row of the projection screen 200 (i.e., the projection areas 210 of the first row except for the leftmost and rightmost sides), and as shown in fig. 16 and 17 (e), another third projector 113 is placed and corresponds to the projection area 210 in the middle of the second row of the projection screen 200 (i.e., the projection areas 210 of the second row except for the leftmost and rightmost sides);

as shown in fig. 17 (b) and (e), in the two third projectors 113, the light attenuating elements 4 include the second, third, and fourth attenuating

elements

42, 43, and 44, that is, the light attenuating elements 4 are located on the projection optical paths 3 corresponding to the lower side edge region, the left side edge region, and the right side edge region of the reflection region 21.

Besides the arrangement of 2 × 2 and 2 × 3, the plurality of projection areas 210 may also be arranged by 2 × 4, 2 × 5, 2 × 6, and the like, and the specific arrangement manner may refer to the description in the first arrangement manner and the second arrangement manner, and is not described herein again. In the arrangement mode that the plurality of projection areas 210 adopt 2 xn (n is more than or equal to 1), the projectors 100 can be arranged on the viewing side of the projection screen 200, half of the projectors 100 can be hung upside down on the ceiling, and the other half of the projectors 100 can be placed on the ground, so that the projectors 100 do not shield the sight of the audience, and the user experience is better; meanwhile, by adopting the projection systems of the first arrangement mode and the second arrangement mode, the projector 100 is located at the viewing side of the projection screen 200, so that the projector 100 does not occupy the space at the back side of the projection screen 200, and the projection screen 200 can be directly arranged on an indoor wall, thereby facilitating the installation of the projection screen 200.

FIGS. 11, 12A, and 13 show a third arrangement of projection systems in which the number of projection regions 210 is nine, arranged in a3 × 3 array; the number of the projectors 100 is nine, and all the projectors are local brightness adjusting projectors 110, the nine local brightness adjusting projectors 110 are all placed in a right position, and the nine local brightness adjusting projectors 110 are respectively a first projector 111, a second projector 112, a third projector 113, a fourth projector 114, a fifth projector 115, a sixth projector 116, a seventh projector 117, an eighth projector 118 and a ninth projector 119, and are all located on the back side of the projection screen 200 (i.e. in a rear projection manner);

in the fourth projector 114, the light attenuating element 4 is arranged as follows: as shown in fig. 13 (a), the light attenuating element 4 includes a first light attenuating element 41 and a fourth light attenuating element 44, that is, the light attenuating element 4 is located on the projection optical path 3 corresponding to the upper side edge region and the right side edge region of the reflection area 21; as shown in fig. 12A and (a) of fig. 13, the fourth projector 114 corresponds to the leftmost projection area 210 of the first row on the projection screen 200;

in the fifth projector 115, the light attenuating element 4 is arranged as follows: as shown in fig. 13 (c), the light attenuating element 4 includes a first light attenuating element 41 and a third light attenuating element 43, that is, the light attenuating element 4 is located on the projection light path 3 corresponding to the upper and left side edge regions of the reflection area 21; as shown in fig. 12A and (c) of fig. 13, the fifth projector 115 corresponds to the rightmost projection area 210 of the first row on the projection screen 200;

in the sixth projector 116, the light attenuating element 4 is arranged as follows: as shown in fig. 13 (b), the light attenuating elements 4 include a first light attenuating element 41, a third light attenuating element 43 and a fourth light attenuating element 44, that is, the light attenuating elements 4 are located on the projection optical path 3 corresponding to the upper side edge region, the left side edge region and the right side edge region of the reflection area 21; as shown in fig. 12A and (b) of fig. 13, the sixth projector 116 corresponds to the projection area 210 in the middle of the first row on the projection screen 200;

in the seventh projector 117, the light attenuating element 4 is arranged as follows: as shown in (e) of fig. 13, the light attenuating elements 4 include a first light attenuating element 41, a second light attenuating element 42 and a fourth light attenuating element 44, that is, the light attenuating elements 4 are located on the projection optical path 3 corresponding to the upper side edge region, the lower side edge region and the right side edge region of the reflection area 21; as shown in fig. 12A and (e) of fig. 13, the seventh projector 117 corresponds to the leftmost projection area 210 of the second row on the projection screen 200;

in the eighth projector 118, the light attenuating element 4 is arranged as follows: as shown in (f) of fig. 13, the light attenuating elements 4 include a first light attenuating element 41, a second light attenuating element 42, a third light attenuating element 43 and a fourth light attenuating element 44, that is, the light attenuating elements 4 are located on the projection optical path 3 corresponding to the upper side edge region, the lower side edge region, the left side edge region and the right side edge region of the reflection area 21; as shown in fig. 12A and (f) of fig. 13, the eighth projector 118 corresponds to the projection area 210 in the middle of the second row on the projection screen 200;

in the ninth projector 119, the light attenuating element 4 is arranged as follows: as shown in (g) of fig. 13, the light attenuating elements 4 include a first light attenuating element 41, a second light attenuating element 42, and a third light attenuating element 43, that is, the light attenuating elements 4 are located on the projection optical path 3 corresponding to the upper side edge region, the lower side edge region, and the left side edge region of the reflection region 21; as shown in fig. 12A and (g) of fig. 13, the ninth projector 119 corresponds to the rightmost projection area 210 of the second row on the projection screen 200;

as shown in fig. 12A and (h) of fig. 13, the first projector 111 corresponds to the leftmost projection area 210 of the third row on the projection screen 200; as shown in fig. 12A and (j) of fig. 13, the second projector 112 corresponds to the rightmost projection area 210 of the third row on the projection screen 200; as shown in fig. 12A and (i) of fig. 13, the third projector 113 corresponds to the projection area 210 in the middle of the third row on the projection screen 200.

In the projection system, the first row projection area 210, the second row projection area 210, and the third row projection area 210 of the projection screen 200 are sequentially arranged in a top-to-bottom direction.

In this arrangement (i.e., the rear projection arrangement), the projection areas 210 may be arranged in a3 × 3 array, or in a2 × 2, 2 × 3, 4 × 4, or other m × m (m ≧ 2) array, and the specific arrangement may be determined according to the actual situation.

FIGS. 8 and 9 illustrate a fourth arrangement of the projection system, in which the number of projection areas 210 is two and is 1 × 2((1 is the number of rows and 2 is the number of columns); the number of projectors 100 is two and is both local brightness adjusting projectors 110, both local brightness adjusting projectors 110 are placed upright, and both local brightness adjusting projectors 110 are the tenth projector 1110 and the eleventh projector 1111, respectively, and are both located on the viewing side of the projection screen (i.e., front projection);

in the tenth projector 1110, the light attenuating element 4 is provided in the following manner: as shown in fig. 9 (a), the light attenuating element 4 includes a third light attenuating element 43, that is, the light attenuating element 4 is located on the projection light path 3 corresponding to the left side edge region of the reflection area 21; as shown in fig. 8 and 9 (a), the tenth projector 1110 corresponds to the projection area 210 located on the left side;

in the eleventh projector 1111, the light attenuating element 4 is disposed as follows: as shown in fig. 9 (b), the light attenuating element 4 includes a fourth light attenuating element 44, that is, the light attenuating element 4 is located on the projection light path 3 corresponding to the right side edge region of the reflection area 21; as shown in fig. 8 and 9 (b), the tenth projector 1110 corresponds to the projection area 210 located on the right side.

In the projection system provided in the embodiment of the present invention, the types of the projectors 100 corresponding to the two adjacent projection areas 210 are not unique, and both the two projectors 100 may be the local brightness adjustment projectors 110, or one of the two projectors 100 may be the local brightness adjustment projector 110, and the other projector 100 may not be provided with the light attenuating element 4;

the projection system of the fourth arrangement is described below as an example: fig. 8 and 9 show a case where the projectors 100 corresponding to two adjacent projection areas 210 are both local brightness adjustment projectors 110, and the projection light paths 3 in which the light attenuation elements 4 of the two local brightness adjustment projectors 110 (i.e., the tenth projector 1110 and the eleventh projector 1111) are located both correspond to the image fusion area 220. In this embodiment, by appropriately adjusting the transmittance of the light attenuating elements 4 in the two local brightness adjusting projectors 110, for example, the transmittance of the light attenuating elements 4 in the two local brightness adjusting projectors 110 may be 50%, so that the brightness of the image fusion area 220 of the two adjacent projection areas 210 and the brightness of the surrounding projection areas 210 tend to be the same.

Fig. 8 and 10 show a case where one of the projectors 100 corresponding to two adjacent projection areas 210 is a local brightness adjustment projector 110 (an eleventh projector 1011 shown in (b) of fig. 10), and the other projector 100 is a projector 100 not provided with the light attenuating element 4 (shown in (a) of fig. 10). In this embodiment, the transmittance of the light attenuating element 4 in one local brightness adjusting projector 110 is adjusted, for example, the transmittance of the light attenuating element 4 is 0 (that is, the light attenuating element 4 is a light shielding element), so that the brightness of the image fusion area 220 of two adjacent projection areas 210 and the brightness of the surrounding projection area 210 tend to be consistent.

For projection systems with other arrangements, such as the first to third arrangements, the projectors 100 corresponding to two adjacent projection areas 210 may also be both local brightness adjustment projectors 110; in addition, one of the projectors 110 may be a local brightness adjustment projector, and the other projector 100 may be a projector without the light attenuation element 4.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a projector, includes projection lens and curved surface speculum, the curved surface speculum is located projection lens's light-emitting side, the projection beam warp that projection lens sent follow behind the reflection of curved surface speculum jet out in the projector to form projection light path, the curved surface speculum includes the reflecting area, the reflecting area does projection beam throws extremely the region that forms on the curved surface speculum, its characterized in that, projector still includes light attenuation spare, light attenuation spare is located projection lens with between the reflecting area projection light path, and light attenuation spare be located with the marginal area of reflecting area is corresponding projection light path.

2. The projector of claim 1 wherein the light attenuating element is located at a convergence of the projected light beam.

3. The projector of claim 1 or 2, wherein the light attenuating elements comprise one or more of a first light attenuating element, a second light attenuating element, a third light attenuating element, and a fourth light attenuating element;

the first light attenuating element is located on the projection light path corresponding to the upper side edge area of the reflecting area, the second light attenuating element is located on the projection light path corresponding to the lower side edge area of the reflecting area, the third light attenuating element is located on the projection light path corresponding to the left side edge area of the reflecting area, and the fourth light attenuating element is located on the projection light path corresponding to the right side edge area of the reflecting area.

4. The projector of claim 1 or 2, wherein the light attenuating element has a gradually increasing transmittance in a direction perpendicular to and away from the optical axis of the projection lens.

5. The projector of claim 1 or 2 wherein the light attenuating element is a light attenuating sheet.

6. The projector as claimed in claim 5, wherein the light attenuating sheet includes a light transmissive plate and a light attenuating film covering at least one side surface of the light transmissive plate in a thickness direction of the light transmissive plate.

7. A projection system comprises a projection screen and a plurality of projectors, wherein projection beams emitted by the projectors can be emitted onto the projection screen to form a plurality of projection areas, the projection areas correspond to the projectors one by one, and the edges of two adjacent projection areas are overlapped to form an image fusion area, wherein at least one of the projectors corresponding to the two adjacent projection areas is a local brightness adjusting projector, the local brightness adjusting projector is the projector according to any one of claims 1 to 6, and a projection light path where a light attenuation element of the local brightness adjusting projector is located corresponds to the image fusion area.

8. The projection system of claim 7, wherein the projectors corresponding to two adjacent projection areas are both the local brightness adjusting projectors, and the projection optical paths on which the light attenuation elements of the two local brightness adjusting projectors are located correspond to the image fusion area.

9. The projection system of claim 7, wherein one of the projectors corresponding to two adjacent projection areas is the local brightness adjustment projector.

10. The projection system of claim 7, wherein the number of the projection areas is 2n, and the projection areas are arranged in a2 x n array, where n is the number of columns of the projection areas and is greater than or equal to 1; the number of the projectors is 2n, the projectors are all the local brightness adjusting projectors, and the 2n local brightness adjusting projectors are respectively 2 first projectors, 2 second projectors and (2n-4) third projectors and are all located on the viewing side of the projection screen;

one of the first projectors is placed upside down and corresponds to the projection area on the leftmost side of the first row of the projection screen, and the other of the first projectors is placed right and corresponds to the projection area on the rightmost side of the second row of the projection screen; the projection screen comprises a projection screen, a first row of projection areas and a second row of projection areas, wherein the projection areas in the first row and the projection areas in the second row of the projection screen are sequentially arranged along the direction from top to bottom;

one of the second projectors is placed upside down and corresponds to the projection area on the rightmost side of the first row of the projection screen, and the other of the second projectors is placed right and corresponds to the projection area on the leftmost side of the second row of the projection screen;

(n-2) the third projectors are placed upside down and respectively in one-to-one correspondence with the projection areas except for the leftmost side and the rightmost side in the first row of the projection screen;

(n-2) the third projectors are all placed in a positive mode and respectively correspond to the projection areas except the leftmost side and the rightmost side in the second row of the projection screen in a one-to-one mode;

in the two first projectors, the light attenuating elements are positioned on the projection light paths corresponding to the lower side edge area and the right side edge area of the reflecting area;

in the two second projectors, the light attenuation pieces are positioned on the projection light paths corresponding to the lower edge area and the left edge area of the reflection area;

in the (2n-4) third projectors, the light attenuating elements are located on the projection light paths corresponding to the lower side edge area, the left side edge area and the right side edge area of the reflection area.