CN111918042A - Projector and projection system - Google Patents

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

Background technique

With the rapid development of projection technology, the application of projection seamless splicing and fusion technology was born. Projection seamless splicing fusion technology is to fuse the projection images projected by two or more projectors at the edges, and finally present a whole image with no gaps, larger image and higher resolution on the projection screen. Among them, how to perform the splicing and fusion of the projection images is very important, which is directly related to the display quality of the projection images.

The related art provides a splicing and fusion scheme of projection images, that is, a scheme using a splicing fusion device. The splicing fusion device can segment the projected image, then generate an image fusion area, and then perform geometric correction and color correction on the image fusion area. processing, and finally form a complete picture on the projection screen.

However, using a splicing fusion device for fusion, as shown in Figure 1, requires each projection area 01 (that is, projection area A1 A2A3 A4, projection area B1B2B3 B4, projection area C1 C2C3 C4, projection area D1 D2D3 D4 ) 20% of the area is used for fusion, and the projection picture in the image fusion area 02 (the shaded area in the figure) is prone to display poor display such as distortion, which reduces the display quality of the projection picture; The use of a splicing fusion device increases the cost of the projection system.

SUMMARY OF THE INVENTION

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

In order to achieve the above object, in the first aspect, an embodiment of the present invention provides a projector, which includes a projection lens and a curved reflector, the curved reflector is located on the light-emitting side of the projection lens, and the projection lens emitted by the projection lens After being reflected by the curved mirror, the light beam is emitted from the projector to form a projection light path. The curved mirror includes a reflection area, and the reflection area is formed by projecting the projection beam onto the curved mirror. area, the projector further includes a light attenuating member, the light attenuating member is located on the projection light path between the projection lens and the reflection area, and the light attenuating member is located at a distance from the reflection area The projection light path corresponding to the edge area.

In a second aspect, an embodiment of the present invention provides a projection system, including a projection screen and a plurality of projectors, and projection beams emitted by the plurality of projectors can all be projected onto the projection screen to form a plurality of projections A plurality of the projection areas are in one-to-one correspondence with a plurality of the projectors, and the edges of two adjacent projection areas overlap to form an image fusion area, and the adjacent two projection areas correspond to At least one of the projectors is a local brightness adjustment projector, the local brightness adjustment projector is the projector described in the first aspect, and the local brightness adjustment projector is located in the projection light path where the light attenuation member is located Corresponding to the image fusion area.

In the projector and the projection system provided by the embodiments of the present invention, since the projector further includes a light attenuating member, the light attenuating member is located on the projection light path corresponding to the edge region of the reflection area. The projection light path where the light attenuator is located corresponds to the image fusion area on the projection screen, so that the brightness of the image fusion area can be reduced to the same or similar brightness as other areas through the attenuation of the light by the light attenuator. It can solve the problem of bright lines formed by the superposition of brightness in the image fusion area, so that there is no need to use a splicing fusion device, which can not only reduce the cost of the projection system, but also the width of the image fusion area of the two adjacent projection areas can be designed very well. If the image fusion area is too large, the image fusion area can be located outside the effective display area. Then, the influence of the image fusion area on the size and analysis of the projected image can be avoided, thereby ensuring the display quality of the projected image.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic diagram of an image fusion area on a projection screen in the related art;

FIG. 2 is a schematic structural diagram of a projector in an embodiment of the present invention;

3 is a schematic structural diagram of the projector in the embodiment of the present invention after removing the top cover and the light attenuating member;

4 is an optical path diagram of a projection beam emitted by a projector in an embodiment of the present invention;

5 is a schematic diagram of a projection system in some embodiments of the present invention (four projection areas are merged, and the upper two projectors are placed upside down);

FIG. 6A is a schematic side view of FIG. 5 (the light attenuating member is not shown in the figure);

FIG. 6B is a top view of FIG. 5 (the light attenuating member is not shown in the figure);

FIG. 7 is a schematic diagram of the arrangement of light attenuating elements in the projector corresponding to the four projection areas in FIG. 5 (the black dots in the figure are the areas formed by the intersection of some projection beams on the converging plane, and the shaded area in figure a is the projection The area formed by the intersection of the beams on the convergence plane; the shaded areas in b, c, and d are the areas formed by the intersection of the projected beams corresponding to the edge area of the reflection area on the convergence plane);

8 is a schematic diagram of a projection screen of a projection system in some embodiments of the present invention (two projection areas are merged);

9 is a schematic diagram of an arrangement of light attenuating members in the projector corresponding to the two projection areas in FIG. 8;

10 is a schematic diagram of another arrangement of light attenuating members in the projector corresponding to the two projection areas in FIG. 8;

11 is a schematic diagram of a projection screen of a projection system in some embodiments of the present invention (nine projection areas are merged);

12A is a schematic side view of a projection system in some embodiments of the present invention (nine projection areas are merged, and the light attenuator is not shown in the figure);

12B is a top view of a projection system in some embodiments of the present invention (light attenuators are not shown in the figure);

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

14 is a cross-sectional view of a light attenuator in some embodiments of the present invention;

15 is a cross-sectional view of a light attenuating member in other embodiments of the present invention;

16 is a schematic diagram of a projection screen of a projection system in some embodiments of the present invention (fusion of six projection areas);

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

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection connected, or integrally connected; those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

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

The inventor of the present invention has learned from the analysis of the scheme using the splicing fusion device in the related art that the fusion area of the solution using the splicing fusion device is larger, and for projectors (especially ultra-short-focus projectors), it is necessary to achieve In a large area of image fusion area, under any conditions of use, the size and resolution of the projection screen are guaranteed to remain unchanged (this is because the screen size of the projection lens will change slightly during operation, and the two adjacent projectors are The direction of the projected image size changes is different, so the corresponding images of the two adjacent projectors in the image fusion area are staggered, resulting in poor resolution), that is, it is difficult to ensure that the projected image is not distorted; if the image fusion area is Zoom out so that the image fusion area only occupies a small size range, which can well solve the problem of distortion of the projected image caused by the image fusion area being too large, but this will make it impossible to use the splicing fusion device because the width of the image fusion area is too small. If the splicing fusion device is not used, the two adjacent projection images cannot be well fused, which will lead to bright lines in the image fusion area (this is caused by the superposition of the brightness of the two projection images in the image fusion area), which will seriously affect the display effect of the projection screen. Based on the above analysis, the present invention solves the problem of bright lines caused by the superposition of brightness by setting a light attenuation element on the projection light path corresponding to the projector and the image fusion area to attenuate the brightness of the light, thus eliminating the need for splicing Then, the image fusion area can be reduced to a small size range, even without occupying the effective display area, thereby solving the problem of distortion of the projection screen caused by the large image fusion area in the related art.

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 reflector 2 , and the curved reflector 2 includes a light-emitting side located on the projection lens 1 , as shown in FIG. 4 As shown in the figure, the projection beam emitted by the projection lens 1 is reflected by the curved mirror 2 and then emitted from the projector to form a projection light path 3; 2, as shown in FIG. 4 and FIG. 7, the projector further includes a light attenuator 4, the light attenuator 4 is located on the projection light path 3 between the projection lens 1 and the reflection area 21, and the light attenuator 4 is located on the projection light path 3. On the projection light path 3 corresponding to the edge area of the reflection area 21 .

Among them, 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 beam emitted by the projection lens 1 can be better converged between the projection lens 1 and the reflection area 21, and the light attenuating element 4 is placed here, and the projection light path 3 where the light attenuator 4 is located can accurately correspond to the image fusion area 220 on the projection screen 200. If the light attenuator 4 is placed elsewhere, the projection beam will not converge well and the spot will be larger. , overlapping with the projection beams corresponding to various parts on the projection screen 200 , making it difficult for the projection light path 3 where the light attenuator 4 is located to correspond to the image fusion area 220 , resulting in lower brightness of the projection screen 200 outside the image fusion area 220 .

In the projector provided by the embodiment of the present invention, since the projector further includes a light attenuating member 4, the light attenuating member 4 is located on the projection light path 3 corresponding to the edge region of the reflection area 21, so that by reasonably arranging the position of the light attenuating member 4, The projection light path 3 where the light attenuator 4 is located corresponds to the image fusion area 220 on the projection screen 200, so that the brightness of the image fusion area 220 can be reduced to the same level as other areas through the attenuation of the brightness of the light by the light attenuator 4. Equal or similar brightness, so that the problem of bright lines formed by the superposition of brightness in the image fusion area 220 can be solved, so there is no need to use a splicing fusion device, which can not only reduce the cost of the projection system, but also reduce the cost of the two adjacent projection areas 210. The width of the image fusion area 220 can be designed to be very small (for example, it can be 1-2 cm in width, within the size of a text display range), then, the projection image distortion caused by the image fusion area 220 being too large can be avoided. Therefore, the display quality of the projected picture can be guaranteed.

In the above embodiment, the location of the light attenuating element 4 is not unique. For example, as shown in FIG. 4 , the light attenuating element 4 may be located at the converging place of the projection beam, for example, the light attenuating element 4 is located on the converging plane 5 of the projection beam. . In addition, the light attenuating member 4 may be located at a position deviating from where the projection beams converge. Compared with the light attenuator 4 located at a position deviating from the convergence of the projection beams, when the light attenuator 4 is located at the convergence of the projection beams, the influence between the projection beams corresponding to each position on the reflection area 21 is minimal, and the light attenuation is set here The element 4 can ensure that the light attenuating element 4 is more accurately located on the projection optical path 3 corresponding to the edge region of the reflection area 21, so as to better prevent the light attenuating element 4 from being located on the projection optical path 3 corresponding to other areas of the reflection area 21, In turn, the light attenuating element 4 can better prevent the light attenuating element 4 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 ways of setting the light attenuating member 4, including at least the following setting ways:

(a) and (d) in FIG. 7 show the first arrangement of the light attenuating member 4. In this arrangement, the light attenuating member 4 includes a second light attenuating member 42 and a fourth light attenuating member 44, The second light attenuating member 42 is located on the projection optical path 3 corresponding to the lower edge region of the reflection area 21, and the fourth light attenuation member 44 is located on the projection optical path 3 corresponding to the right edge area of the reflection area 21;

In this arrangement, the second light attenuating member 42 and the fourth light attenuating member 44 may be disposed separately or integrally formed, which is not specifically limited herein.

Parts (b) and (c) of FIG. 7 show the second arrangement of the light attenuating member 4, in this setting, the light attenuating member 4 includes a second light attenuating member 42 and a third light attenuating member 43, The third light attenuating member 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 light attenuating member 42 and the third light attenuating member 43 may be disposed separately or integrally formed, which is not specifically limited herein.

As shown in FIG. 5 and FIG. 6A , the projectors adopting the above-mentioned first setting method and the second setting method can be applied to four projection areas 210 , which are arranged in a 2×2 array, and the number of projectors is four. Each of them is placed in the projection system on the viewing side of the projection screen 200 .

(a) in FIG. 13 shows a third arrangement of the light attenuating member 4. In this arrangement, the light attenuating member 4 includes a first light attenuating member 41 and a fourth light attenuating member 44. The first light attenuating member 44 The attenuator 41 is located on the projection light path 3 corresponding to the upper edge region of the reflection area 21;

In this arrangement, the first light attenuating member 41 and the fourth light attenuating member 44 may be disposed separately or integrally formed, which is not specifically limited herein.

(c) in FIG. 13 shows a fourth arrangement of the light attenuating member 4, in this arrangement, the light attenuating member 4 includes a first light attenuating member 41 and a third light attenuating member 43;

In this arrangement, the first light attenuating member 41 and the third light attenuating member 43 may be disposed separately, or may be integrally formed, which is not specifically limited herein.

(b) in FIG. 13 shows a fifth arrangement of the light attenuating member 4 , in this arrangement, the light attenuating member 4 includes a first light attenuating member 41 , a third light attenuating member 43 and a fourth light attenuating member 41 . Attenuator 44;

In this arrangement, the first light attenuating member 41 , the third light attenuating member 43 and the fourth light attenuating member 44 may be disposed separately or integrally formed, which is not specifically limited herein.

(e) in FIG. 13 shows the sixth arrangement of the light attenuating member 4, in this arrangement, the light attenuating member 4 includes a first light attenuating member 41, a second light attenuating member 42 and a fourth light attenuating member piece 44;

In this arrangement, the first light attenuating member 41 , the second light attenuating member 42 and the fourth light attenuating member 44 may be disposed separately or integrally formed, which is not specifically limited herein.

(g) in FIG. 13 shows a seventh arrangement of the light attenuating member 4 , in this arrangement, the light attenuating member 4 includes a first light attenuating member 41 , a second light attenuating member 42 and a third light attenuating member 42 piece 43;

In this arrangement, the first light attenuating member 41 , the second light attenuating member 42 and the third light attenuating member 43 may be disposed separately or integrally formed, which is not specifically limited herein.

(i) in FIG. 13 shows an eighth arrangement of the light attenuating member 4 , in this arrangement, the light attenuating member 4 includes a second light attenuating member 42 , a third light attenuating member 43 and a fourth light attenuating member 43 piece 44;

In this arrangement, the second light attenuating member 42 , the third light attenuating member 43 and the fourth light attenuating member 44 may be disposed separately or integrally formed, which is not specifically limited herein.

(f) in FIG. 13 shows the ninth arrangement of the light attenuating member 4 , in this arrangement, the light attenuating member 4 includes a first light attenuating member 41 , a second light attenuating member 42 , and a third light attenuating member 42 . piece 43 and a fourth light attenuating piece 44;

In this arrangement, the first light attenuating member 41 , the second light attenuating member 42 , the third light attenuating member 43 and the fourth light attenuating member 44 may be disposed separately or integrally formed, which is not specifically limited here. .

The projectors using the above-mentioned third to ninth setting methods, as shown in Figure 11 and Figure 12A, can be applied to nine projection areas, arranged in a 3×3 array, and the number of projectors is nine and all Placed in the projection system on the back side of the projection screen.

(a) in FIG. 9 shows a tenth arrangement mode of the light attenuating member 4, in this setting mode, the light attenuating member 4 includes a third light attenuating member 43;

(b) in FIG. 9 shows an eleventh arrangement mode of the light attenuating member 4, in this setting mode, the light attenuating member 4 includes a fourth light attenuating member 44;

The projectors using the tenth setting method and the eleventh setting method above, as shown in FIG. 8 , can be applied to two projection areas 210 and are arranged in a 1×2 (row×column) array. The number is 2 and both are placed in the projection system on the viewing side of the projection screen 200 .

In the projector provided by the embodiment of the present invention, the setting manner of the light attenuating member 4 can be specifically adjusted according to the projection system to which the projector is applied. Among them, the projectors using the first to fourth setting methods have better versatility and are widely used, and can be applied to front projection projection systems with 2n projection areas 210 arranged in a 2×2 array (as shown in the figure). 7), it can also be applied to a rear projection projection system in which nine projection areas 210 are arranged in a 3×3 array (as shown in FIG. 13 ).

In the projector provided by the embodiment of the present invention, the first light attenuating member 41 may be entirely located on the projection light path 3 corresponding to the upper edge area of the reflection area 21 , or may be partially located at the upper edge area of the reflection area 21 . The corresponding projection light path 3 is not specifically limited here; the second light attenuating member 42 may be entirely located on the projection light path 3 corresponding to the lower edge region of the reflection area 21, or may be partially located below the reflection area 21. On the projection light path 3 corresponding to the side edge area, no specific limitation is made here; The projection light path 3 corresponding to the left edge region of the area 21 is not specifically limited here; the fourth light attenuating members 44 may all be located on the projection light path 3 corresponding to the right edge region of the reflection area 21, or may A part is located on the projection light path 3 corresponding to the right edge region of the reflection area 21 , which is not specifically limited here.

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

(2) The “upper” and “lower” in the upper edge region and lower edge region of the reflection area 21 of the curved mirror 2 are also defined when the projector 100 is in the upright state. Therefore, from the same Observed from the viewing direction (the G1 direction in FIG. 6A ), the first projector 111 and the second projector 112 shown in (a) and (b) in FIG. 7 are the same as those shown in (c) and (d) in FIG. 7 . "Up" and "Down" in the first projector 111 and the second projector 112 are also just opposite;

(3) "Left" and "Right" on the projection screen 200 are defined by the direction located on the viewing side of the projection screen 200 and facing the projection screen 200 as the viewing direction (for example, the G2 direction in FIG. 5 and FIG. 6A ), For example, as shown in Figure 5;

Second, the reflection area 21 of the curved mirror 2 can reflect the projection beam emitted by the projection lens 1 to the projection area 210 of the projection screen 200 . There is a certain correspondence between the light reflected at different positions of the reflection area 21 and the position of the projection area 210 . relation:

(1) For the projector 100 that is being placed, such as the projector 100 located at the bottom in FIG. 5 and FIG. 6A , the light reflected by the upper edge area of the reflection area 21 corresponds to the lower edge area of the projection area 210 . The light reflected by the lower edge area corresponds to the upper edge area of the projection area 210; for the projector 100 placed upside down, such as the projector 100 located above in FIGS. 5 and 6A, the light reflected by the upper edge area of the reflection area 21 Corresponding to the upper edge area of the projection area 210, the light reflected by the lower edge area of the reflection area 21 corresponds to the lower edge area of the projection area 210;

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

In the projector provided by the embodiment of the present invention, the light transmittance of the light attenuating member 4 may be constant; in addition, the light transmittance of the light attenuating member 4 may also be changed, as shown in FIG. 4 and FIG. 7 ( As shown in c), along a direction perpendicular to the optical axis 6 of the projection lens 1 and away from the optical axis 6 of the projection lens 1 (eg, the X direction in FIG. 4 ), the transmittance of the light attenuating member 4 gradually increases. Compared with the embodiment in which the light transmittance of the light attenuating member 4 is constant, the light transmittance of the light attenuating member 4 is changed (the embodiments shown in FIG. 4 and FIG. The intensity change of the brightness of the projection beam at different positions (the farther away from the optical axis 6 of the projection lens 1, the lower the brightness of the projection beam) adjusts the light transmittance of the light attenuator 4, as shown in (c) in FIG. 7 . It is shown that at a position farther from the optical axis 6 of the projection lens 1, the brightness of the projection beam is relatively small, and the light transmittance of the light attenuating element 4 at this position is set to be larger, so as to avoid the impact on the projection beam. Excessive attenuation of brightness, the brightness of the projection beam is relatively large at a position closer to the optical axis 6 of the projection lens 1, and the light transmittance of the light attenuator 4 at this position is set to be small, which can be reduced. The difference in brightness between the projection beam at this location and the projection beam at other positions ensures uniform brightness of the projection beam emitted by the projection lens 1 , thereby ensuring uniform brightness of the image on the projection screen 200 .

In the projector provided by the embodiment of the present invention, the structure and shape of the light attenuating member 4 is not unique. For example, as shown in FIG. 7 , the light attenuating member 4 may be a light attenuating sheet. In addition, the light attenuating member 4 may also be a light attenuating rod. Compared with the light attenuating rod, the light attenuating sheet occupies a smaller space, so that the structure of the projector can be made more compact.

The structure of the light attenuating sheet is not unique. For example, the light attenuating sheet may have the following structure. As shown in FIG. 14 , the light attenuating sheet includes a light-transmitting plate 43 and a light-attenuating film 44 . The film 44 covers both side surfaces (or one side surface) of the light-transmitting plate 43 . In addition, as shown in FIG. 15 , the light attenuation sheet may also have the following structure: the light attenuation sheet includes a first substrate 45 , a second substrate 46 and an electrochromic material layer 49 , and the opposite surfaces of the first substrate 45 and the second substrate 46 A first electrode 47 and a second electrode 48 are respectively provided thereon, and the electrochromic material layer 49 is sandwiched between the first electrode 47 and the second electrode 48 . During operation, an electric field is applied between the first electrode 47 and the second electrode 48. Driven by the electric field, the color of the electrochromic material layer 49 changes to change the light transmittance, thereby attenuating light to a certain extent. Compared with the embodiment in which the light attenuation sheet includes the first substrate 45 , the second substrate 46 and the electrochromic material layer 49 , the light attenuation sheet has a simpler structure in the embodiment in which the light attenuation sheet includes the base substrate 43 and the light attenuation film 44 . , no need to energize, not only can avoid the power consumption of the light attenuation sheet, but also can improve the reliability of the light attenuation sheet.

In the embodiment in which the light-attenuating sheet includes the light-transmitting plate 43 and the light-attenuating film 44, the light-attenuating film 44 can be a light-absorbing film, and the transmittance of the light-absorbing film can be changed by adjusting the thickness of the light-absorbing film, for example, the thickness of the light-absorbing film can be changed. The light-transmitting plate 43 can be a glass substrate or a resin substrate, which is not specifically limited here. The thickness of the light-transmitting substrate 43 may be less than 2 mm.

In the embodiment in which the light attenuation sheet includes the first substrate 45, the second substrate 46 and the electrochromic material layer 49, a plurality of first electrodes 47 may be provided, and the plurality of first electrodes 47 are all opposite to the second electrodes 48. An electrode 47 is located at different positions of the first substrate 45 respectively. In this way, different voltages can be applied to different first electrodes 47, the color of the electrochromic material layer 49 at different positions can be changed, and then the transmittance of different positions can be changed, so as to realize the transmittance of the light attenuating sheet. The change.

In the projector provided by the embodiment of the present invention, the difference in the attenuation of the light in different wavelength bands (for example, the wavelength band 440-645 nm used by the laser projector) should be less than or equal to 2% by the light attenuating element 4, so that the light attenuating element 4 in different wavelengths The attenuation degree of the light in the wavelength band is similar, so as to avoid the color distortion of the image projected by the projector to the image fusion area 220 caused by excessive absorption of the light in a certain wavelength band (eg green light, corresponding to wavelength 492-577 nm) by the light attenuating element 4 .

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 , and projection beams emitted by the plurality of projectors 100 are projected onto the projection screen 200 , to form a plurality of projection areas 210, the plurality of projection areas 210 are in one-to-one correspondence with the plurality of projectors 100, and the edges of two adjacent projection areas 210 overlap to form an image fusion area 220, two adjacent projection areas 220. At least one of the projectors 100 corresponding to the area 210 is the local brightness adjustment projector 110, the local brightness adjustment projector 110 is the projector 100 described in the first aspect, and the light attenuation member 4 of the local brightness adjustment projector 110 is located. The projection light path 3 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, since at least one of the plurality of projectors 100 is a local brightness adjustment projector 110, the projection light path 3 where the light attenuator 4 of the local brightness adjustment projector 110 is located is different from the image fusion area 220. Correspondingly, in this way, the light attenuator 4 can attenuate the brightness of the image fusion area 220 during operation, so as to eliminate the bright lines in the image fusion area 220 and ensure better fusion of the images of the two adjacent projection areas 210. In this way, Without using a splicing fusion device, the width of the image fusion areas 220 of the two adjacent projection areas 210 can be designed to be very small, and the image fusion area 220 can be located outside the effective display area, so image fusion can be avoided. If the area 220 is too large, the resulting image is distorted, so that the display quality of the projection picture can be guaranteed.

The arrangement of the projection system provided by the embodiment of the present invention is not unique, and at least includes the following arrangements:

FIG. 5, FIG. 6A and FIG. 7 show the first arrangement of the projection system. In this arrangement, the number of projection areas 210 is four, and the number of projection areas 210 is 2×2 (2 is the number of rows and 3 is the number of columns). ) array arrangement; the number of projectors 100 is four, and they are all partial brightness adjustment projectors 110, and the four partial brightness adjustment projectors 110 are respectively two first projectors 111 and two second projectors 112 , and both are located on the viewing side of the projection screen 200 (that is, the way of front projection);

In the two first projectors 111, the light attenuating member 4 adopts the following arrangement: as shown in (a) and (d) of FIG. 7 , the light attenuating member 4 includes a second light attenuating member 42 and a fourth light attenuating member 42. On the part 44, that is: the light attenuating parts 4 are all located on the projection light path corresponding to the lower edge area and the right edge area of the reflection area 21, and, as shown in FIG. 5 and FIG. 6A, a first projector 111 is placed upside down, and corresponds to the projection area 210 at the upper left of the projection screen 200, and another first projector 111 is placed upright, and corresponds to the projection area 210 at the lower right of the projection screen 200;

In the two second projectors 112 , the light attenuating members 4 are arranged in the following manner: As shown in (b) and (c) of FIG. 7 , the light attenuating members 4 include the second light attenuating members 42 and the third light attenuating members The elements 43, that is, the light attenuating elements 4 are located on the projection light path corresponding to the lower edge region and the left edge region of the reflection area 21, and, as shown in FIG. 5 and FIG. 6A, a second projector 112 The second projector 112 is placed upside down and corresponds to the projection area 210 at the upper right of the projection screen 200 , and the other second projector 112 is placed upright and corresponds to the projection area 210 at the lower left of the projection screen 200 .

Figures 16 and 17 show the second arrangement of the projection system. In this arrangement, the number of projection areas 210 is six, and the array is 2×3 (2 is the number of rows, 3 is the number of columns) Arrangement; the number of projectors 100 is six, and they are all partial brightness adjustment projectors 110, and the six partial brightness adjustment projectors 110 are two first projectors 111, two second projectors 112 and two The third projectors 113 are all located on the viewing side of the projection screen 200 (that is, front projection);

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

As shown in (c) of FIGS. 16 and 17 , a second projector 112 is placed upside down and corresponds to the projection area 210 on the far right of the first row of the projection screen 200 , as shown in FIGS. 16 and 17 . As shown in (d), another second projector 112 is being placed and corresponds to the leftmost projection area 210 in the second row of the projection screen 200 .

As shown in FIGS. 16 and 17 (b), a third projector 113 is placed upside down, and the projection area 210 in the middle of the first row of the projection screen 200 (that is, the first row except the leftmost and rightmost 16 and 17 (e), another third projector 113 is placed, and corresponds to the projection area 210 ( That is, the second row corresponds to the projection area 210 except the leftmost and the rightmost;

Wherein, as shown in (b) and (e) of FIG. 17 , in the two third projectors 113, the light attenuating member 4 includes a second attenuating member 42, a third attenuating member 43 and a fourth attenuating member 44, That is, the light attenuating member 4 is located on the projection light path 3 corresponding to the lower edge region, the left edge region and the right edge region of the reflection area 21 .

In addition to the 2×2 and 2×3 arrangements, the multiple projection areas 210 can also be arranged in 2×4, 2×5, 2×6, etc. For the specific arrangement, please refer to the first arrangement and the second arrangement The description in the method will not be repeated here. In a 2×n (n≧1) arrangement of the plurality of projection areas 210 , the projectors 100 can all be arranged on the viewing side of the projection screen 200 , and half of the projectors 100 can be hung upside down on the ceiling, and the other half can be hung upside down on the ceiling. The target projector 100 can be placed on the ground, so that the projector 100 will not block the sight of the audience, and the user experience is better; at the same time, using the projection systems of the first arrangement and the second arrangement, the projector 100 is located on the projection screen. 200, so that the projector 100 does not occupy the space on the back side of the projection screen 200, and the projection screen 200 can be directly installed on the indoor wall, so that the installation of the projection screen 200 can be facilitated.

FIG. 11 , FIG. 12A and FIG. 13 show the third arrangement of the projection system. In this arrangement, the number of projection areas 210 is nine, and they are arranged in a 3×3 array; the number of projectors 100 There are nine projectors 110 for local brightness adjustment. The nine projectors for local brightness adjustment 110 are all placed upright, and the nine projectors for local brightness adjustment 110 are the first projector 111, the second projector 112, the third projector The projector 113 , the fourth projector 114 , the fifth projector 115 , the sixth projector 116 , the seventh projector 117 , the eighth projector 118 and the ninth projector 119 are all located on the back side of the projection screen 200 ( That is, the way of rear projection);

In the fourth projector 114, the light attenuating member 4 adopts the following arrangement: as shown in (a) of FIG. 13, the light attenuating member 4 includes a first light attenuating member 41 and a fourth light attenuating member 44, that is, The light attenuating member 4 is located on the projection light path 3 corresponding to the upper edge region and the right edge region of the reflection area 21; as shown in FIG. 12A and FIG. The leftmost projection area 210 in the first row corresponds to;

In the fifth projector 115, the light attenuating member 4 adopts the following arrangement: as shown in (c) of FIG. 13, the light attenuating member 4 includes a first light attenuating member 41 and a third light attenuating member 43, that is, The light attenuating member 4 is located on the projection light path 3 corresponding to the upper edge region and the left edge region of the reflection area 21; as shown in FIG. 12A and (c) in FIG. 13, the fifth projector 115 and the projection screen 200 The projection area 210 on the far right of the first row corresponds to;

In the sixth projector 116, the light attenuating member 4 adopts the following arrangement: as shown in (b) of FIG. 13, the light attenuating member 4 includes a first light attenuating member 41, a third light attenuating member 43 and a fourth light attenuating member The attenuating member 44, that is, the light attenuating member 4 is located on the projection light path 3 corresponding to the upper edge region, the left edge region, and the right edge region of the reflection area 21; FIG. 12A and FIG. 13(b) As shown, 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 member 4 adopts the following arrangement: as shown in (e) of FIG. 13, the light attenuating member 4 includes a first light attenuating member 41, a second light attenuating member 42 and a fourth light attenuating member 41. The attenuation member 44, that is, the light attenuation member 4 is located on the projection light path 3 corresponding to the upper edge region, lower edge region, and right edge region of the reflection area 21; FIG. 12A and FIG. 13(e) As shown, the seventh projector 117 corresponds to the leftmost projection area 210 in the second row on the projection screen 200;

In the eighth projector 118, the light attenuating member 4 adopts the following arrangement: as shown in (f) of FIG. 13, the light attenuating member 4 includes a first light attenuating member 41, a second light attenuating member 42, a third light The attenuating member 43 and the fourth light attenuating member 44 , that is, the light attenuating member 4 is located on the projection light path 3 corresponding to the upper edge region, lower edge region, left edge region, and right edge region of the reflection area 21 12A and (f) in 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 member 4 adopts the following arrangement: as shown in (g) of FIG. 13, the light attenuating member 4 includes a first light attenuating member 41, a second light attenuating member 42 and a third light attenuating member 41. The attenuating member 43, that is, the light attenuating member 4 is located on the projection light path 3 corresponding to the upper edge region, lower edge region, and left edge region of the reflection area 21; FIG. 12A and (g) in FIG. 13 As shown, the ninth projector 119 corresponds to the projection area 210 on the far right of the second row on the projection screen 200;

As shown in FIGS. 12A and 13(h), the first projector 111 corresponds to the leftmost projection area 210 on the third row on the projection screen 200; as shown in FIGS. 12A and 13(j) , the second projector 112 corresponds to the projection area 210 on the far right of the third row on the projection screen 200; as shown in FIG. 12A and (i) in FIG. The projection area 210 in the middle of the row corresponds.

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

In this arrangement (that is, the rear-projection arrangement), in addition to being arranged in a 3×3 array, the projection areas 210 can also be arranged in m×m (m×2, 2×3, 4×4, etc.) ≥2) array arrangement, the specific arrangement can be determined according to the actual situation.

FIG. 8 and FIG. 9 show the fourth arrangement of the projection system. In this arrangement, the number of projection areas 210 is two, and the number of projection areas 210 is 1×2 ((1 is the number of rows, 2 is the number of columns) Array arrangement; the number of projectors 100 is two, both of which are local brightness adjustment projectors 110, the two local brightness adjustment projectors 110 are all placed right, and the two local brightness adjustment projectors 110 are respectively the tenth projector 1110 and the eleventh projector 1111, and both are located on the viewing side of the projection screen (that is, the way of front projection);

In the tenth projector 1110, the light attenuating member 4 adopts the following arrangement: as shown in (a) of FIG. On the projection light path 3 corresponding to the left edge area of the area 21; as shown in (a) in FIG. 8 and FIG. 9, the tenth projector 1110 corresponds to the projection area 210 located on the left side;

In the eleventh projector 1111, the light attenuating member 4 adopts the following arrangement: as shown in (b) of FIG. 9, the light attenuating member 4 includes a fourth light attenuating member 44, that is, the light attenuating member 4 is located at On the projection light path 3 corresponding to the right edge area of the reflection area 21 ; as shown in FIG. 8 and (b) in FIG. 9 , the tenth projector 1110 corresponds to the projection area 210 on the right side.

In the projection system provided by the embodiment of the present invention, the types of projectors 100 corresponding to the two adjacent projection areas 210 are not unique. Both the projectors 100 may be local brightness adjustment projectors 110, or there may be one projector 100 for local brightness adjustment. The projector 110 for local brightness adjustment, and the other is the projector 100 without the light attenuating element 4;

The projection system of the fourth arrangement is used as an example to illustrate: FIG. 8 and FIG. 9 show the situation that the projectors 100 corresponding to the two adjacent projection areas 210 are both the local brightness adjustment projectors 110, and the two The projection light paths 3 where the light attenuators 4 of the local brightness adjustment projectors 110 (ie, the tenth projector 1110 and the eleventh projector 1111 ) are located are all corresponding to the image fusion area 220 . In this embodiment, the transmittance of the light attenuating member 4 in the projector 110 is adjusted by reasonably adjusting the two local brightness. The sizes may both be 50%, so that the brightness of the image fusion regions 220 of the two adjacent projection regions 210 tends to be consistent with the brightness of the surrounding projection regions 210 .

FIG. 8 and FIG. 10 show that one of the projectors 100 corresponding to two adjacent projection areas 210 is a local brightness adjustment projector 110 (the eleventh projector 1011 shown in (b) of FIG. 10 ) , the other projector 100 is the case of the projector 100 without the light attenuation member 4 (as shown in (a) of FIG. 10 ). In this embodiment, the transmittance of the light attenuating member 4 in the projector 110 is adjusted by reasonably adjusting a local brightness, for example, the transmittance of the light attenuating member 4 is 0 (that is, the light attenuating member 4 4 is a shading member), so that the brightness of the image fusion regions 220 of the two adjacent projection regions 210 tends to be consistent with the brightness of the surrounding projection regions 210 .

For projection systems using other arrangements, such as projection systems using the first to third arrangements, the projectors 100 corresponding to two adjacent projection areas 210 may also be local brightness adjustment projectors 110; in addition, There may also be one projector 110 for local brightness adjustment, and the other projector 100 without the light attenuating member 4. The specific arrangement can be determined according to the actual situation, and will not be repeated here.

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

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Any person skilled in the art who is familiar with the technical scope disclosed by the present invention can easily think of changes or replacements, which should cover within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (10)

1. A projector, comprising a projection lens and a curved reflector, the curved reflector is located on the light-emitting side of the projection lens, and a projection beam emitted by the projection lens is reflected by the curved reflector from the projection. to form a projection light path, the curved mirror includes a reflection area, and the reflection area is an area formed by projecting the projection beam onto the curved mirror. It is characterized in that the projector further includes a light Attenuating member, the light attenuating member is located on the projection light path between the projection lens and the reflection area, and the light attenuation member is located on the projection light path corresponding to the edge area of the reflection area . 2 . The projector of claim 1 , wherein the light attenuating member is located at the convergence of the projection beams. 3 . 3. The projector according to claim 1 or 2, wherein the light attenuating member comprises one of a first light attenuating member, a second light attenuating member, a third light attenuating member and a fourth light attenuating member or more; Wherein, the first light attenuating member is located on the projection light path corresponding to the upper edge area of the reflection area, and the second light attenuating member is located at the lower edge area of the reflection area. On the projection light path, the third light attenuating member is located on the projection light path corresponding to the left edge region of the reflection area, and the fourth light attenuation member is located at the right edge of the reflection area The projection light path corresponding to the area. 4. The projector according to claim 1 or 2, wherein along a direction perpendicular to the optical axis of the projection lens and away from the optical axis of the projection lens, the transmittance of the light attenuating member gradually increases increase. 5. The projector according to claim 1 or 2, wherein the light attenuating member is a light attenuating sheet. 6 . The projector according to claim 5 , wherein the light-attenuating sheet comprises a light-transmitting plate and a light-attenuating film, and along the thickness direction of the light-transmitting plate, the light-attenuating film covers the light-transmitting plate. 7 . on at least one surface of the board. 7. A projection system, comprising a projection screen and a plurality of projectors, the projection beams emitted by the plurality of projectors can all be projected onto the projection screen to form a plurality of projection areas, the plurality of projection areas and A plurality of the projectors are in one-to-one correspondence, and the edges of two adjacent projection areas overlap to form an image fusion area. It is characterized in that the projectors corresponding to the adjacent two projection areas are At least one of them is a local brightness adjustment projector, the local brightness adjustment projector is the projector according to any one of claims 1 to 6, and the projection light path where the light attenuation member of the local brightness adjustment projector is located is located Corresponding to the image fusion area. 8 . The projection system according to claim 7 , wherein the projectors corresponding to the two adjacent projection areas are the local brightness adjustment projectors, and the two local brightness adjustment projectors The projection light paths where the light attenuating elements of the projector are located are all corresponding to the image fusion area. 9 . The projection system according to claim 7 , wherein one of the projectors corresponding to the two adjacent projection areas is the local brightness adjustment projector. 10 . 10 . The projection system according to claim 7 , wherein the number of the projection areas is 2n and arranged in a 2×n array, wherein n is the number of columns of the projection area and is greater than or equal to 10 . 1; the number of the projectors is 2n, all of which are the local brightness adjustment projectors, and the 2n local brightness adjustment projectors are respectively 2 first projectors, 2 second projectors and (2n - 4) third projectors, 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 upright and corresponds to the projection area on the leftmost side of the projection screen. The projection areas on the far right of the two rows correspond to each other; wherein, the projection areas in the first row and the projection areas in the second row of the projection screen are sequentially arranged in the direction from top to bottom; One of the second projectors is placed upside down and corresponds to the projection area on the far right side of the first row of the projection screen, and the other is placed upright and corresponds to the first row of the projection screen. The leftmost projection area of the two rows corresponds to; (n-2) the third projectors are placed upside down, and are in one-to-one correspondence with the projection areas except the leftmost and the rightmost in the first row of the projection screen; (n-2) the third projectors are all placed, and are in one-to-one correspondence with the projection areas in the second row of the projection screen except the leftmost and the rightmost; Wherein, in the two first projectors, the light attenuating member is located on the projection light path corresponding to the lower edge region and the right edge region of the reflection area; In the two second projectors, the light attenuating members are both located on the projection light paths corresponding to the lower edge region and the left edge region of the reflection area; In (2n-4) of the third projectors, the light attenuating members are all located on the projection light paths corresponding to the lower edge region, the left edge region, and the right edge region of the reflection area .

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