CN110928130A - Projection screen and projection system - Google Patents
Projection screen and projection system Download PDFInfo
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- CN110928130A CN110928130A CN201911331525.2A CN201911331525A CN110928130A CN 110928130 A CN110928130 A CN 110928130A CN 201911331525 A CN201911331525 A CN 201911331525A CN 110928130 A CN110928130 A CN 110928130A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
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Abstract
The invention provides a projection screen and a projection system, and relates to the technical field of medium and long focus optical projection. The projection screen comprises an imaging element layer, an optical structure layer and a reflecting layer which are sequentially arranged along the thickness direction, wherein the cross section of the optical structure layer in the thickness direction is a plurality of triangles which are arranged in a row, the optical structure layer is formed by respectively sweeping the plurality of triangles along a plurality of arcs, one side of each triangle is arranged on the surface of the imaging element layer, and the angle of each triangle far away from the imaging element layer is 70-110 degrees; the projection system comprises the projection screen and a projection device. Through the arrangement, the projection screen has the advantages of high brightness, high light energy utilization rate, low energy consumption, high graphic definition, good environment light resistance and high contrast ratio compared with diffuse reflection projection screens such as white plastic screens and the like.
Description
Technical Field
The invention relates to the technical field of medium and long focus optical projection, in particular to a projection screen and a projection system.
Background
With the continuous development of projection display technology, projection is widely used as a simple and convenient display mode, for example, in the entertainment life or office needs of a family, a projection device is developed in the directions of small volume, light weight, low energy consumption and the like, and projection images are required to have good image quality, high brightness, high contrast and good ambient light resistance. These requirements are not met by existing mid-tele front projection screens (e.g., white screens). The white plastic screen can only diffuse and reflect the light beams output by the projection device, the transmission direction of the light beams cannot be effectively controlled, and the transmission of ambient light cannot be controlled, so that the light energy utilization rate of the screen is low, the overall brightness of the screen is extremely low, the required power of the projection device is higher, and the energy consumption is higher; and the screen has no light resistance basically, and the problem of low screen contrast is caused.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a projection screen and a projection system, so as to solve the problems of poor uniformity of display brightness, low light energy utilization rate, poor ambient light resistance, and low contrast of the conventional projection screen and system.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
a projection screen comprises an imaging element layer, an optical structure layer and a reflecting layer which are sequentially arranged along the thickness direction, wherein the cross section of the optical structure layer in the thickness direction is a plurality of triangles which are arranged in a row, the optical structure layer is formed by respectively sweeping the plurality of triangles along a plurality of arcs, one side of each triangle is arranged on the surface of the imaging element layer, and the angle of the triangle far away from the imaging element layer is 70-110 degrees.
In a preferred option of the embodiment of the present invention, in the projection screen, the imaging element layer includes at least one of a diffusion particle layer, a point lens layer, a diffusion surface layer, or a cylindrical microlens layer, and the imaging element layer plays roles of uniform diffusion imaging, adjusting a viewing field, adjusting a display color, and the like.
In a preferred option of the embodiment of the present invention, in the projection screen, the diffusion particle layer includes a transparent substrate layer and a transparent resin layer that are stacked, the transparent resin layer is mixed with diffusion particles, and a scratch-resistant light-transmitting layer is disposed on a side of the transparent substrate layer away from the transparent resin layer. Further, the diffusing particles are spheres or polyhedrons.
In a preferred option of the embodiment of the present invention, in the projection screen, at least one of the dot lens layers is provided, and at least one surface of each of the dot lens layers perpendicular to the thickness direction is provided with a dot lens.
In a preferred option of the embodiment of the present invention, in the projection screen, at least one diffusion surface layer is provided, and at least one surface of each diffusion surface layer in a direction perpendicular to the thickness direction is a non-smooth surface. The diffusion surface layer can control the trend of the projection light beams and can uniformly distribute the projection light beams in a specific area. The diffusion surface layer can be directly coated or transferred on the surface of the optical structure layer, or the diffusion surface layer can be coated or transferred on the transparent substrate layer and then adhered to the optical structure layer through resin.
In a preferred option of the embodiment of the present invention, in the projection screen, the number of the lenticular layers is not less than one, each of the lenticular layers includes a plurality of linear lenticular microlenses arranged in a row, and a cross section of each of the lenticular layers in the thickness direction is a plurality of circles, ellipses, parabolas, arches, or polygons arranged in a row.
In a preferred choice of the embodiment of the present invention, in the projection screen, the arc is a portion of any one of a circle center, an ellipse, a parabola and a high-order curve.
In a preferred option of the embodiment of the present invention, in the projection screen, the arc lines are circular and arranged in concentric circles.
The embodiment of the invention also provides a projection system, which comprises a projection device and a projection screen for performing imaging display based on the projection light beam output by the projection device; the projection screen comprises an imaging element layer, an optical structure layer and a reflecting layer which are sequentially arranged along the thickness direction, the cross section of the optical structure layer in the thickness direction of the optical structure layer is a plurality of triangles which are arranged in a row, the optical structure layer is formed by sweeping the plurality of triangles along a plurality of arc lines, one side of each triangle is arranged on the surface of the imaging element layer, and the angle of the triangle far away from the imaging element layer is 70-110 degrees.
The embodiment of the invention has the following beneficial effects: the projection screen comprises the imaging element layer, the optical structure layer and the reflecting layer which are sequentially arranged along the thickness direction, the cross section of the optical structure layer in the thickness direction is a plurality of triangles which are arranged in a row, the transmission direction of projection light beams can be effectively controlled, the light energy utilization rate of the projection screen is improved, and compared with the traditional projection screen, the projection screen has the advantages of high brightness, high contrast, clear image display and good ambient light resistance. The projection system provided by the embodiment of the invention comprises the projection screen and the projection device, the utilization rate of light energy is effectively improved, the power required by the projection device is reduced, and the energy consumption of the projection system is further reduced.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic structural diagram of a projection screen according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a layer structure of an imaging element according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a diffusion particle layer provided in an embodiment of the present invention;
fig. 4 is a schematic view of a first structure of a dot lens layer according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a second dot lens layer according to an embodiment of the present invention;
FIG. 6 is a schematic view of a first structure of a diffusion surface layer according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a second structure of a diffusion surface layer according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a first structure of a lenticular microlens layer according to an embodiment of the present invention;
FIG. 9 is a schematic diagram illustrating a second structure of a lenticular microlens layer according to an embodiment of the present invention;
FIG. 10 is a schematic diagram illustrating a third structure of a lenticular microlens layer according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of the positional relationship between the imaging element layer and the optical structure layer provided in the embodiment of the present invention;
FIG. 12 is a cross-sectional view of two structures of an optical structure layer according to an embodiment of the present invention;
FIG. 13 is a schematic structural diagram of a projection screen formed by a first optical structure layer according to an embodiment of the present invention;
FIG. 14 is a schematic structural diagram of a projection screen formed by a second optical structure layer according to an embodiment of the present invention;
FIG. 15 is a schematic structural diagram of a projection screen formed by a third optical structure layer according to an embodiment of the present invention;
FIG. 16 is a schematic diagram of a projection screen formed by a fourth optical structure layer according to an embodiment of the present invention;
FIG. 17 is an optical path diagram of a projection beam passing through a projection screen of a first configuration according to an embodiment of the present invention;
FIG. 18 is a diagram of an optical path formed by a projection beam passing through a projection screen of a second configuration according to an embodiment of the present invention;
FIG. 19 is a diagram illustrating the light paths of a projection beam passing through a projection screen having a third configuration according to an embodiment of the present invention;
FIG. 20 is a schematic diagram illustrating reflection of ambient light above a projection screen according to an embodiment of the present invention;
FIG. 21 is a schematic diagram of a projection system and a projection screen according to an embodiment of the present invention reflecting a projection beam;
icon: 10-a projection system; 20-a projection screen; 100-an imaging element layer; 101-a diffusion particle layer; 102-a diffusion surface layer; 103-a lenticular layer; 104-optical structure layer; 105-a reflective layer; 107-spot lens layer; 111-diffusion particles; 112-non-smooth face; 113-linear cylindrical microlenses; 114-triangle; 115-point lens; 120-a transparent substrate layer; 130-a light transmitting layer; 140-transparentA resin layer; 150-rough surface; c-circle center; c1-a geometric center of the projection screen; e-projecting the light beam; e1-a first light ray; e2-a second light ray; f-ambient light; g-audience; t-projection device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. In the description of the present invention, the terms "immediately adjacent," "one side," "another side," and the like are used merely for distinguishing the description, and are not to be construed as merely or implying relative importance.
In the description of the present invention, the terms "disposed", "superimposed", and "disposed" are to be construed broadly unless otherwise explicitly specified or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, a projection screen 20 provided in an embodiment of the present invention includes an imaging element layer 100, an optical structure layer 104, and a reflective layer 105 sequentially disposed along a thickness direction, a cross section of the optical structure layer 104 in the thickness direction is a plurality of triangles 114 arranged in a row and a row, the optical structure layer is formed by the plurality of triangles 114 respectively sweeping along a plurality of arcs, one side of the triangles 114 is disposed on a surface of the imaging element layer 100, and an angle of the triangles 114 away from the imaging element layer 100 is 70 ° to 110 °.
It is understood that the triangle 114 in the cross section of the optical structure layer 104 in the thickness direction may be any angle in the range of 70 ° to 110 ° away from the imaging element layer 100, and is not limited to 70 ° or 110 °.
In particular, the projection screen 20 may further include a speckle suppression layer disposed on a side of the imaging element layer 100 away from the optical structure layer 104, where each position of the speckle suppression layer is different from a phase of the projection beam, so as to eliminate alternate bright and dark irregular spots generated by interference of the projection beam on the screen, and improve the definition of image display of the projection screen.
In the present embodiment, as shown in fig. 2 to 10, the imaging element layer 100 includes at least one of a diffusion particle layer 101, a dot lens layer 107, a diffusion surface layer 102, or a pillar microlens layer 103. That is, the imaging element layer 100 may be any one of the diffusing particle layer 101, the dot lens layer 107, the diffusing surface layer 102, and the lenticular lens layer 103; any two of the diffusion particle layer 101, the dot lens layer 107, the diffusion surface layer 102, and the pillar microlens layer 103 may be laminated; any three of the diffusion particle layer 101, the point-like lens layer 107, the diffusion surface layer 102, and the columnar microlens layer 103 may be laminated without limiting the positional relationship; the diffusion particle layer 101, the dot lens layer 107, the diffusion surface layer 102, and the pillar microlens layer 103 may be laminated, and the positional relationship between the layers is not limited.
In particular, the imaging element layer 100 may also be uniformly doped with pigment or toner, or a colored layer may be separately provided in the structure of the imaging element layer 100, and the position of the colored layer may be adjusted as needed, and may be located between the structures of the imaging element layer 100, or may be located outside the structures of the imaging element layer 100.
In the present embodiment, as shown in fig. 2, the imaging element layer 100 is formed by sequentially laminating the diffusion surface layer 102, the diffusion particle layer 101, and the lenticular lens layer 103 in the thickness direction; the diffusion surface layer 102, the diffusion particle layer 101, and the lenticular lens layer 103 may have a single-layer structure or a multilayer structure.
In the present embodiment, as shown in fig. 3, the diffusion particle layer 101 includes a transparent substrate layer 120 and a transparent resin layer 140 stacked, the diffusion particles 111 are mixed in the transparent resin layer 140, and a scratch-resistant light-transmitting layer 130 is provided on a side of the transparent substrate layer 120 away from the transparent resin layer 140.
In this embodiment, the light-transmitting layer 130 may have scratch resistance, may be a protective film that is scratch resistant, or may be a light-transmitting resin material having a high hardness in a cured state. The light-transmitting layer 130 is laminated on one side of the transparent substrate layer 120, so that the effects of glare resistance and speckle suppression on the surface of the screen can be achieved.
In this embodiment, the specific material composition of the transparent substrate layer 120 is not limited, and may be set according to the actual application requirement. That is, the transparent substrate layer may be a flexible structure or a structure having a certain rigidity. The transparent substrate layer 120 of the flexible structure includes, but is not limited to, flexible transparent plastic or rubber films such as PE, PVC, CPP, BOPP, PC, PET, PMMA, polycarbonate, PA, TPU, etc. The transparent substrate layer 120 having a certain rigid structure includes, but is not limited to, a transparent substrate such as glass, acryl, ceramic, and the like. In addition, the visible light transmittance of the transparent substrate layer 120 is not particularly limited, and may be set according to the actual application requirements; in this embodiment, for the excellent effect of the imaging display, the visible light transmittance of the transparent substrate layer 120 may be ensured to be greater than or equal to 75%.
In this embodiment, the transparent resin layer 140 may be a thermosetting resin, a radiation-curable resin, or a reaction-curable resin, and the transparent resin layer 140 may be selected according to actual production requirements.
In this embodiment, the material, the number, and the ratio of the diffusion particles 111 are not limited, and specific materials may be selected and specific number ratios may be set according to the actual viewing field and the requirement of the uniformity of the screen display brightness. Specifically, the material of the diffusion particles 111 is not limited, and may be a metal material or a non-metal material, and in actual production, the refractive index of the diffusion particles 111 may be as different as possible from the refractive index of the transparent resin layer 140 so as to diffuse the projection light beam entering the transparent resin layer 140.
In this embodiment, the manner of mixing the diffusion particles 111 in the transparent resin layer 140 is not limited, and may be specifically set according to the requirements of the actual viewing field and the uniformity of the screen display brightness. The setting mode includes but is not limited to: the diffusion particles 111 are mixed with a liquid resin, and then are formed on the surface of the transparent substrate layer 120 away from the light-transmitting layer by coating.
In this embodiment, the distribution manner of the diffusion particles 111 in the transparent resin layer 140 is not limited, and for example, the diffusion particles 111 may be distributed in the transparent resin layer 140 in an ordered manner, or may be arranged in the transparent resin layer 140 in a disordered and disordered manner. In order to have better imaging display effect and enable the projection light beam to be better diffused, the diffusion particles 111 are orderly arranged in the transparent resin layer 140 according to a multilayer array.
It is understood that the diffusion particles 111 may be in any shape, for example, spheres or polyhedrons, and specifically, the diffusion particles 111 may be elliptical spheres, spheres or polyhedrons with certain edges.
In this embodiment, as shown in fig. 4, a first structural diagram of the point-shaped lens layer 107 is provided, the point-shaped lens layer 107 is a single layer, the point-shaped lens layer 107 is provided with point-shaped lenses 115 on a plane perpendicular to the thickness direction, and the point-shaped lenses 115 are uniformly distributed on the plane perpendicular to the thickness direction of the point-shaped lens layer 107, so as to achieve the effects of uniformly diffusing the projection light beam and better imaging.
In this embodiment, as shown in fig. 5, a second structural diagram of the dot-shaped lens layer 107 is provided, the dot-shaped lens layer 107 is provided as a multilayer structure, a plane of each dot-shaped lens layer 107 in the vertical thickness direction is provided with dot-shaped lenses 115, the dot-shaped lenses 115 are uniformly distributed in the plane of the dot-shaped lens layer 107 in the vertical thickness direction, and the multilayer structure of the dot-shaped lens layer 107 is provided to more uniformly diffuse incident light.
In this embodiment, as shown in fig. 6, a first structural diagram of the diffusion surface layer 102 is provided, where the diffusion surface layer 102 is provided as a single layer, one side of the diffusion surface layer 102 perpendicular to the thickness direction is a non-smooth surface 112, and the projection light beam can diffuse on the non-smooth surface 112 when entering the diffusion surface layer 102.
In this embodiment, as shown in fig. 7, a second structural diagram of the diffusion surface layer 102 is provided, the diffusion surface layer 102 is provided as a multi-layer structure, and one surface of each diffusion surface layer 102 in a direction perpendicular to the thickness direction is a non-smooth surface 112, so that the projection light beam entering the diffusion surface layer 102 is diffused more sufficiently, and a more uniform luminance display is obtained.
It is understood that the diffusion surface layer 102 can be directly used as the imaging element layer 100, directly coated or transferred on the side of the optical structure layer 104 away from the reflective layer 105, and sequentially laminated with the optical structure layer 104 and the reflective layer 105 to form the projection screen 20; the diffusion surface layer 102 may be bonded to at least one of the diffusion particle layer 101, the dot-shaped lens structure layer 106, and the lenticular lens layer 130, which are formed of the transparent substrate layer 120 and the transparent resin layer 140, to form the image forming element layer 100, and the diffusion surface layer 102 may be applied or transferred to the transparent substrate layer 120 on the side away from the transparent resin layer 140 to form the image forming element layer 100.
Specifically, the non-smooth surface 112 may be a surface with a rugged structure, where the specific shape, number and distribution of the rugged structure may be set according to the actual application requirement. For example: the non-smooth surface 112 may be formed of an irregular concave-convex shape, may be formed of a regular concave-convex shape, or may be formed of a combination of an irregular concave-convex shape and a regular concave-convex shape; the asperities in the non-smooth surface 112 can be tens, hundreds, or thousands; the non-smooth portions 112 may be arranged orderly according to a certain rule, may be arranged randomly according to a certain rule, may be arranged orderly according to a certain rule, and may be arranged randomly according to a certain rule. In order to improve the diffusion capability of the diffusion surface layer 102 to the projection light beam, the non-smooth surface 112 may be randomly arranged.
In this embodiment, a first structural diagram of the lenticular microlens layer 103 is provided as shown in fig. 8, the lenticular microlens layer 103 is a one-layer structure, the lenticular microlens layer 103 is composed of a plurality of linear lenticular microlenses 113 arranged in rows, and the cross section of the lenticular microlens layer 103 in the thickness direction is a plurality of circular, arc or bow shapes arranged in rows.
In this embodiment, a second schematic structural diagram of the lenticular microlens layer 103 is provided as shown in fig. 9, the lenticular microlens layer 103 is a multilayer structure, the lenticular microlens layer 103 is composed of a plurality of linear lenticular microlenses 113 arranged in rows, and the cross section of the lenticular microlens layer 103 in the thickness direction is a plurality of circular, arc or bow shapes arranged in rows; the shape and arrangement of each layer of the lenticular microlens layers 103 are the same, that is, the lenticular microlens layers 103 of each layer are the same, and the lenticular microlens layers 103 of each layer are stacked in the same direction.
In this embodiment, a third schematic structural diagram of the pillar microlens layer 103 is provided as shown in fig. 10, and the first pillar microlens layer 103 is disposed in the same manner as in fig. 9, except that: the second layer of the lenticular microlens layer 103 is rotated 90 ° along the plane and then laminated with the first layer of the lenticular microlens layer 103; the third layer of the lenticular microlens layer 103 is arranged in the same direction as the first layer of the lenticular microlens layer 103, and is laminated with the second layer of the lenticular microlens layer 103; the fourth layer of the lenticular microlens layer 103 is arranged in the same direction as the second layer of the lenticular microlens layer 103, and is laminated with the second layer of the lenticular microlens layer 103 in sequence according to the above rule.
Specifically, the lenticular microlens layer 103 may be directly coated or transferred on the side of the optical structure layer 104 away from the reflective layer 105, or may be bonded to at least one of other structures such as the diffusion particle layer 101, the point lens layer 107, or the diffusion surface layer 102, and then the side of the optical structure layer 104 away from the reflective layer 105 is adhered.
In this embodiment, as shown in fig. 11, the lenticular lens layer 103 is disposed adjacent to the optical structure layer 104, and the lenticular lens layer 103 is arranged vertically and downwardly to adjust the field angle of the projection screen in the horizontal direction. Similarly, the lenticular microlens layers 103 may be arranged horizontally to adjust the vertical field angle of the projection screen. The optical structure layer 104 can be directly fabricated on the surface of the cylindrical microlens layer 103; the surface of the columnar microlens layer 103 may be formed after being bonded to at least one of the diffusion particle layer, the dot lens layer, and the diffusion surface layer.
In this embodiment, as shown in fig. 12, a cross section of the optical structure layer 104 in the thickness direction is a plurality of triangles 114 arranged in a row, one side of the triangle 114 is disposed on the surface of the imaging element layer 100, and an angle α of the triangle away from the imaging element layer 100 is 70 ° to 110 °.
It will be appreciated that the triangles 114 can be the same or different, and that the two sides forming the angle α can be equal or unequal, and that the angle α of the triangles away from the imaging element layer 100 can be set between 70 and 110 degrees as desired to achieve the purpose of adjusting the reflection of the projected light rays toward a particular viewing area.
In particular, the angle α is preferably 85 ° to 95 °, the setting angle α is preferably 90 °, and when the angle α is 90 °, all incident light to the optical structure layer 104 can be returned in a direction parallel to the incident light, so that the projection screen obtains the best brightness and contrast.
In this embodiment, the optical structure layer is formed by sweeping a plurality of triangles along a plurality of arcs, one side of each triangle is disposed on the surface of the imaging element layer, and an angle of each triangle away from the imaging element layer is 70 ° to 110 °; the arc line is a part of any one of a circle, an ellipse, a parabola and a high-order curve. As shown in fig. 13 to 16, a schematic structural diagram of a projection screen 20 composed of four optical structure layers 104 is provided. As shown in fig. 13, the arcs are portions of concentric circles, that is, the arcs are parallel to each other in the projection screen 20, and a center C of the concentric circles is offset from a geometric center C of the projection screen 201. As shown in fig. 14, the arcs are concentric circles or portions of concentric circles, and the center C of the concentric circles is located at the geometric center C1 of the projection screen 20, i.e., the center C of the concentric circles coincides with the geometric center C1 of the projection screen 20. As shown in fig. 15, a plurality of the arcs are a plurality of ellipses, and the ellipse centers of the ellipses are the same. As shown in fig. 16, the plurality of arcs are a plurality of parabolas, the central positions of the plurality of parabolas are the same, and the plurality of parabolas are parallel to each other. Specifically, the specific junction forming manner of the optical structure layer may be selected according to actual requirements.
In the present embodiment, as shown in fig. 17 to 19, light path diagrams of projection screens having three different structures are shown. The projection screen comprises an imaging element layer 100, an optical structure layer 104 and a reflecting layer 105 which are sequentially arranged along the thickness direction; the cross section of the optical structure layer 104 in the thickness direction is a plurality of triangles 114 arranged in a row, the optical structure layer 104 is formed by the plurality of triangles 114 respectively sweeping along a plurality of arcs, one edge of the triangle 114 is arranged on the surface of the imaging element layer 100, and the triangle 114 is far away from the imaging element layer 100The angle of the element layer 100 is 70 to 110 degrees; the reflective layer 105 is disposed on the plane formed by the two sides of the triangle 114 away from the imaging element layer 100. As shown in fig. 17, the imaging element layer 100 is formed of a diffusion particle layer 101 mixed with diffusion particles 111, and a projection light beam E passes through the imaging element layer 100, the optical structure layer 104, and the reflection layer 105, which are formed of the diffusion particle layer 101, in this order; as shown in fig. 18, the imaging element layer 100 is formed by a dot lens layer 107, a row of dot lenses 115 arranged mutually are arranged on one side surface of the dot lens layer 107 perpendicular to the thickness direction, and a projection light beam E sequentially passes through the imaging element layer 100, the optical structure layer 104 and the reflection layer 105 which are formed by the dot lens layer 107; as shown in fig. 19, the image-forming element layer 100 is formed of a diffusion surface layer 102, the diffusion surface layer 102 is a non-smooth surface 112 on the side away from the optical structure layer 104, and a projection beam E passes through the image-forming element layer 100, the optical structure layer 104 and the reflective layer 105, which are formed of the diffusion surface layer 102, in this order. Wherein the projection beam E enters the optical structure layer 104 through the imaging element layer 100 as a first light E1(ii) a First light ray E1The second light beam E is obtained by the reflection of the optical structure layer 104 and the reflection layer 1052。
Specifically, the cross section of the optical structure layer 104 in the thickness direction is a plurality of triangles 114 arranged in a row, the angle α of the triangle 114 far away from the imaging element layer 100 is 90 °, and the first light ray E of the projection light beam E entering the optical structure layer 104 through the imaging element layer 1001And the first light ray E1The second light beam E is obtained by the reflection of the optical structure layer 104 and the reflection layer 1052Parallel to each other but with opposite transmission directions and not reflected outside a particular viewing field.
It is understood that the reflectivity of the reflective layer 105 to visible light can be set according to the requirements of practical application, that is, according to the requirements of imaging display effect. In particular, the reflectivity of the reflective layer 105 to visible light is greater than or equal to 60% to ensure the best imaging effect. In addition, to theThe thickness of the reflective layer 105 is not determined accordingly, and the thickness of the reflective layer 105 can be controlled to be 50nm to 50000nm for the best effect. The reflective layer 105 may be a metal reflective layer, an alloy reflective layer, or a non-metal composite reflective layer, as long as it has a certain reflective capability to visible light; the metal reflective layer includes, but is not limited to: aluminum, silver, gold, chromium, nickel, copper; the alloy reflective layer includes, but is not limited to: nichrome, aluminum alloy, titanium alloy; the non-metallic composite reflective layer includes, but is not limited to: TiO 22/SiO2，Nb2O5/SiO2， Ta2O5/SiO2，Al2O3/SiO2，HfO2/SiO2，TiO2/MgF2，Nb2O5/MgF2，Ta2O5/MgF2，Al2O3/MgF2，HfO2/MgF2The film stack structure is formed by alternately combining materials with equal height and low refractive index.
In this embodiment, in order to prevent the reflective layer 105 from being oxidized and deteriorated and falling off after long-term use, and to prolong the service life of the projection screen, the projection screen 20 may further include a protective layer, and the protective layer is disposed on the surface of the reflective layer 105 away from the optical structure layer 104; the materials of the protective layer include, but are not limited to: SiO 22、Si3N4、Al2O3、SiCN、TiO2SiN, SiC, chromium, nickel, stainless steel, aluminum plates, glass plates, ceramic plates and iron plates, scratch-resistant resin, PET protective films, hot melt adhesives and the like.
In this embodiment, as shown in fig. 20, an ambient light F incident on the optical structure layer 104 from above the projection screen 20 passes through the reflective layer 105 on the surface of the optical structure layer 104 and undergoes specular reflection along the surface of the optical structure layer 104 formed by sweeping a plurality of triangles along a plurality of arcs, and the ambient light F is reflected and then kept away from the viewing area, so that the projection light beam E is not affected by the ambient light F, and the contrast of the projection screen is effectively improved.
In this embodiment, as shown in fig. 21, a projection system 10 provided by the present invention includes a projection screen and a projection apparatus T, where the projection screen includes an imaging element layer 100, an optical structure layer 104, and a reflective layer 105, which are sequentially arranged along a thickness direction, a cross section of the optical structure layer 104 in the thickness direction is a plurality of triangles arranged in a row and a row, the optical structure layer 104 is formed by a plurality of triangles respectively sweeping along a plurality of arcs, one side of each triangle is arranged on a surface of the imaging element layer 1100, and an angle of each triangle away from the imaging element layer 100 is 70 ° to 110 °; the imaging element layer 100 of the projection screen is adjacent to the projection device T. The projection device T emits a projection light beam E which is diffused and imaged based on the imaging element layer 100 of the projection screen 20, and is reflected based on the optical structure layer 104 and the reflective layer 105. It will be appreciated that the transmission path of projection beam E in projection screen 20 may be controlled by adjusting the angle of the triangle away from the angle of imaging element layer 100 to reduce the amount of energy that is reflected by projection beam E outside the viewing range of viewer G. Under the condition that the brightness of the projection beam E emitted by the projection device T is low, the angle adjustment variation of the angle of the triangle far from the imaging element layer 100 is not too large, so as to prevent the light from being too dispersed, and the display brightness of the projection screen is too low. Through the selection of different structures of the optical structure layer 104, the display brightness, uniformity and light energy utilization rate of the projection screen can be effectively improved. The optical structure layer can effectively reflect the ambient light F projected by each party away from the viewing area, so that the projection light beam E is not influenced by an ambient pipeline, and the contrast and the light resistance of the projection screen are effectively improved.
In this embodiment, as shown in fig. 21, the projection screen further includes a light-transmitting layer 130 with scratch resistance, which is disposed on a surface of the imaging element layer 100 on a side away from the optical structure layer 104, and effectively improves scratch resistance of the projection screen, and functions as a protective film for the projection screen; the light-transmitting layer 130 may be a light-transmitting resin material having a high hardness in a solid state; the euphotic layer 130 can effectively prevent the projection screen from being scratched in the processes of production, manufacture, packaging, transportation, use and cleaning, so that the watching effect is ensured, and the practical value of the projection screen is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A projection screen is characterized by comprising an imaging element layer, an optical structure layer and a reflecting layer which are sequentially arranged along the thickness direction, wherein the cross section of the optical structure layer in the thickness direction is a plurality of triangles which are arranged in a row, the optical structure layer is formed by sweeping a plurality of triangles along a plurality of arc lines, one side of each triangle is arranged on the surface of the imaging element layer, and the angle of each triangle far away from the imaging element layer is 70-110 degrees.
2. A projection screen according to claim 1 wherein the imaging element layer comprises at least one of a diffusing particle layer, a dot lens layer, a diffusing surface layer and a lenticular layer.
3. The projection screen of claim 2 wherein the diffusing particle layer comprises a transparent substrate layer and a transparent resin layer laminated together, the transparent resin layer having diffusing particles mixed therein, the transparent substrate layer being provided with a scratch-resistant light transmitting layer on a side thereof remote from the transparent resin layer.
4. A projection screen according to claim 3 wherein the diffusing particles are spheres or polyhedrons.
5. A projection screen according to claim 2 wherein said dot lens layers are not less than one layer, each of said dot lens layers having dot lenses on at least one side perpendicular to the thickness direction.
6. A projection screen according to claim 2 wherein said diffusing surface layer is not less than one layer, each said diffusing surface layer having at least one non-smooth surface perpendicular to the thickness direction.
7. The projection screen of claim 2, wherein the lenticular layer is not less than one layer, each layer of lenticular layer comprises a plurality of rows of linear lenticular lenticules, and the cross section of each layer of lenticular lenticules in the thickness direction is a plurality of mutually arranged circles, ellipses, parabolas, arches or polygons.
8. A projection screen according to claim 1 wherein the arcs are portions of any one of circular, elliptical, parabolic and high order curves.
9. The projection screen of claim 8 wherein the arcs are circular and are arranged in concentric circles.
10. A projection system is characterized by comprising a projection device and a projection screen for image display based on a projection light beam output by the projection device; the projection screen comprises an imaging element layer, an optical structure layer and a reflecting layer which are sequentially arranged along the thickness direction, the cross section of the optical structure layer in the thickness direction of the optical structure layer is a plurality of triangles which are arranged in a row, the optical structure layer is formed by sweeping the plurality of triangles along a plurality of arc lines, one side of each triangle is arranged on the surface of the imaging element layer, and the angle of the triangle far away from the imaging element layer is 70-110 degrees.
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| CN201911331525.2A CN110928130A (en) | 2019-12-21 | 2019-12-21 | Projection screen and projection system |
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| CN201911331525.2A CN110928130A (en) | 2019-12-21 | 2019-12-21 | Projection screen and projection system |
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