WO2022242304A1

WO2022242304A1 - Projection screen and projection system

Info

Publication number: WO2022242304A1
Application number: PCT/CN2022/082444
Authority: WO
Inventors: 张益民; 胡世加; 王起飞
Original assignee: 成都菲斯特科技有限公司
Priority date: 2021-05-19
Filing date: 2022-03-23
Publication date: 2022-11-24

Abstract

A projection screen (10) and a projection system (20). The projection screen (10) is provided with a microstructure layer (102) for converging projection light. The projection screen (10) is divided, in a vertical direction, into several imaging areas, the microstructure layer (102) within the range of each imaging area converges the projection light to a convergence point, all the convergence points are located on the same straight line perpendicular to the projection screen (10), and the convergence point of at least one imaging area does not overlap with the convergence points of the other imaging areas. By means of the projection screen (10) and the projection system (20), the range of a field of view is effectively improved, and viewing brightness and brightness uniformity in a field of view of a large area range are effectively improved, thereby reducing the limitation on the position of a viewer, and improving the viewing experience.

Description

Projection screen and projection system

This application claims the priority of the Chinese patent application with the application number 202110543437.X and the title of the invention "a design method for a projection system" filed with the China Patent Office on May 19, 2021, and filed on March 10, 2022 The priority of the Chinese patent application with application number 202210235071.4 and application title "A Projection Screen and Projection System" submitted to the China Patent Office, the entire contents of which are incorporated in this application by reference.

technical field

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

Background technique

The projection display system needs a projector and a projection screen. The function of the projection screen is to image the image emitted by the projector and redistribute the projection light intensity. The projection screen needs to rely on various components on the screen to redistribute the projection light intensity This kind of fine structure diffuses and converges the projected light or controls the transmission direction of the light according to the needs, so as to meet the needs of different viewing fields. One of the widespread problems of current projection screens is that in different viewing positions, the brightness displayed on the screen varies greatly. Unlike LCD or LED screens, there is no large difference in display brightness within a large field of view. Therefore, one of the gaps between projection screens and LCD or LED is that under different viewing fields of view on the projection screen, the viewer feels uneven brightness, which greatly affects the viewer's visual experience. In addition, in the current popular short-focus projection applications, the viewing field of the projection screen perceived by the viewer is smaller than that of LCD or LED.

The design method of the general projection system is to converge the projection light to the front of the geometric center of the projection screen through the fine structure on the projection screen. For example, the domestic patent application publication number is CN109917613A, which describes the use of Fresnel lenses. The projected light is converged to a position 3 meters in front of the geometric center of the screen, as shown in Figure 1. The problem with the practical application of this technical solution is that only viewers located 3 meters in front of the geometric center of the screen can see The brightness of the screen is the highest, and viewers in other positions can receive very little light, and the brightness of the screen they see will be very low, and the brightness distribution of the screen viewed in other positions is extremely uneven. A brighter image can only be seen when the height of the viewer's eyes is just at the height of the projection screen's converging point, and for a taller or shorter viewer, because the viewer's eyes deviate from the projection screen's converging point, they cannot see a brighter image. More light is received, so the brightness of the viewed image is very low, resulting in a small viewing field of view of the projection system.

Contents of the invention

The technical problem to be solved and the technical task proposed by the present invention are to improve the existing technology and provide a projection screen to solve the problem that the traditional projection screen in the current technology has a small field of view, high requirements for the position of the viewer, and only a small area If you deviate from the best viewing position, there will be problems of extremely low viewing brightness and extremely uneven screen brightness.

For solving above technical problem, technical scheme of the present invention is:

A projection screen, the projection screen is provided with a microstructure layer for converging projection light, and the projection screen is divided into several imaging areas along the vertical direction, and the microstructure layer within the range of each imaging area respectively converges the projection light to A converging point, all converging points are on the same straight line perpendicular to the projection screen, and the converging point of at least one imaging area does not coincide with the converging points of other imaging areas.

The projection screen of the present invention divides the projection screen into several imaging areas, and each imaging area has its corresponding projection light convergence point. In other words, the microstructure layer is also divided into several partitions along the vertical direction according to the division of the imaging area. , each partition of the microstructure layer converges the projection light to a preset convergence point, compared with the prior art where the entire projection screen converges the projection light to a single convergence point, the present invention effectively broadens the viewing experience Since each imaging area has a projection light convergence point, the viewer can always receive sufficient projection light in a large viewing field of view, thereby ensuring viewing brightness, for example, the viewer along the The convergence point is located in a straight line and moves between the convergence point farthest from the projection screen and the nearest convergence point. There is always at least one imaging area where the projection light can be fully concentrated to the position of the viewer, and the projection light of other imaging areas Part of it will be received by the viewer, thereby effectively improving the overall viewing brightness in a large viewing area. In the prior art, since the entire projection screen converges the projection light to a single convergence point, once the viewer deviates from the convergence point, the entire The viewing brightness of the projection screen will drop sharply, which will affect the viewing experience, and the present invention adopts a projection light convergence point for each imaging area, which also effectively improves the uniformity of the screen viewed in the viewing field of view of a large area. The center of the image light projected by the projector has the highest brightness, that is, the light projected in the middle area of the projection screen has the highest brightness. When the existing technology uses the entire projection screen to converge the projection light to a single convergence point, the viewer is at The entire picture viewed at the best viewing position will be a picture with a brighter center and darker edges around it, and the brightness uniformity is poor. The present invention converges the projection light in different imaging areas to different points, which can avoid excessive concentration of light. Effectively improve the uniformity of viewing brightness, the present invention greatly improves the range of effective viewing field of view, and improves viewing experience.

Further, in the vertical direction of the projection screen, the vertical distance from the convergence point of the middle imaging area to the projection screen is greater than the vertical distance from the convergence point of the top imaging area and the bottom imaging area to the projection screen;

Alternatively, the vertical distance from the converging point of the central imaging area to the projection screen is equal to the vertical distance from the converging point of the top imaging area to the projection screen, and greater than the vertical distance from the converging point of the bottom imaging area to the projection screen.

The present invention converges the projection light in the central imaging area to a place farther away from the projection screen, that is, makes the projection light in the central imaging area diverge farther. Viewing brightness, solves the problem of too bright in the middle of the projection screen and too dark at the edge, improves the uniformity of viewing brightness, and because the projection light in the central imaging area converges to a place farther away from the projection screen, it also makes it possible to watch at a distance The high-brightness screen makes the overall brightness of the screen not too different between close-up viewing and long-distance viewing, improving the consistency of close-up viewing and long-distance viewing experience, and increasing the effective viewing field of view. For the second method, the effective viewing field of view can be appropriately reduced when viewing from a distance is not required, which can improve the overall screen brightness when viewing at a close distance.

Further, the vertical distance from the convergence point of the top imaging area to the projection screen is greater than or equal to the vertical distance from the convergence point of the bottom imaging area to the projection screen. In general, viewers are watching at a middle distance. When a short-focus projector is used to project image light to the projection screen, the short-focus projector is usually set on the lower side of the projection screen, so that the distance between the top area of the projection screen and the projector Further, the projection light brightness received by the top area of the projection screen is lower. In order to improve the viewing brightness uniformity, the convergence point of the imaging area near the top is set at the middle distance, that is, the imaging area near the top The converging point is located between the converging point of the central imaging area and the converging point of the bottom imaging area, thereby increasing the projection light received by the viewer from the top imaging area and reducing the projection light received by the viewer from the middle imaging area and the bottom imaging area. The projection light of the imaging area can effectively improve the brightness uniformity.

Further, the vertical distance from the convergence point of the central imaging area to the projection screen is less than or equal to 12 times the height of the projection screen. The vertical distance from the convergence point of the central imaging area to the projection screen should not be too large, which will lead to sudden changes in the shape of the microstructure layer, which is difficult to process and implement, and if it is too large, the brightness of the central area of the projection screen will be too low, which will cause uneven viewing brightness .

Further, the vertical distance from the convergence point of the central imaging area to the projection screen is greater than or equal to 6 meters, and the vertical distance from the convergence point of the bottom imaging area to the projection screen is greater than or equal to 2 meters and less than 6 meters. It is suitable for small-sized projection screens, such as projection screens of 100 inches or less, which can effectively increase the field of view and improve the brightness uniformity of the screen at any position in the field of view, which is beneficial to the promotion of projection screens.

Further, the imaging area can be divided equally or unequally along the vertical direction of the projection screen, and the imaging area can be divided according to the actual situation, which can be customized, and can be customized according to the viewing distance, the size of the projection screen, the height of the viewer, etc. Division can maximize viewing brightness and uniformity, and improve viewing experience.

Further, the projection screen is vertically divided into three imaging areas: upper, middle, and lower. Compared with a larger number of imaging areas, the amount of calculation data is relatively small, and the implementation is more convenient and simple, which is beneficial to reduce Design difficulty.

Further, the straight line where the convergence point is located is lower than the height of the geometric center of the projection screen. In actual use, the height of the viewer's front line of sight is lower than the height of the geometric center of the projection screen. In the prior art, the projection light Converging to the front of the geometric center of the screen, so that the observed brightness is lower than the design value, and the viewing experience is poor. The present invention sets the projection light convergence point of each imaging area to be lower than the geometric center height of the projection screen, which can It enables the viewer to receive more projection light, so that the viewer can obtain a brighter image display effect and brightness uniformity effect from the projection screen.

Further, the straight line where the convergent point is located intersects the straight line passing through the geometric center of the projection screen vertically, and the intersection point is located outside the area of the projection screen. The brightness of the projection screen is symmetrical from left to right, and the uniformity of brightness is improved. Viewers who are facing the geometric center of the projection screen can obtain the best viewing experience, with high viewing brightness and good brightness uniformity.

Further, the microstructure layer includes several unit lenses arranged in concentric circles in the plane direction of the projection screen and having a zigzag cross-section. The microstructure layer is in the shape of an annular Fresnel lens, which can effectively converge the projection light. By designing the pitch, height and lens surface inclination of the unit lenses, the converging focus of each unit lens on the projection light can be controlled. In this way, the projection screen can be divided into several imaging areas. By designing and adjusting the parameters of the unit lenses in each imaging area, each imaging area has an independent projection light convergence point, which ultimately improves the viewing field of view and improves viewing. Brightness and brightness uniformity.

Further, the center of the concentric circles of the unit lenses is located outside the area of the projection screen, that is, the microstructure layer is in the shape of an annular Fresnel lens with an offset structure, and the center of the concentric circles of the unit lenses is specifically located below the projection screen, And the center of the concentric circle is on the straight line passing through the geometric center of the projection screen vertically. Since the center of the concentric circle is located outside the area of the projection screen, the unit lens on the projection screen area is a part of a perfect circle, that is, the unit lens is in the shape of an arc , in other words, the entire microstructure layer includes several arc-shaped unit lenses arranged radially along the center of the concentric circles.

A projection system includes the above-mentioned projection screen and a projector for projecting image light to the projection screen.

Further, viewed from the normal direction of the projection screen, the projector is located outside the area of the projection screen.

Compared with the prior art, the present invention has the advantages of:

The projection screen and the projection system of the present invention effectively improve the range of viewing field of view, effectively improve viewing brightness and brightness uniformity in a large viewing field of view, reduce restrictions on the position of viewers, and improve viewing experience.

Description of drawings

1 is a schematic diagram of a projection system in the prior art;

Fig. 2 is a schematic diagram of the projection system of the present invention;

Fig. 3 is a kind of structural representation of microstructure layer of the present invention;

Fig. 4 is another kind of structural representation of microstructure layer of the present invention;

Fig. 5 is the third structural representation of the microstructure layer of the present invention;

Fig. 6 is the fourth structural representation of the microstructure layer of the present invention;

Fig. 7 is a schematic diagram of a projection system according to an embodiment of the present invention;

Fig. 8 is a comparison diagram of the optical paths of a projection system of the present invention and a projection system of the prior art;

Fig. 9 is a schematic structural diagram of a projection screen of the present invention;

Fig. 10 is a schematic cross-sectional structure diagram of a projection screen embodiment of the present invention;

Fig. 11 is a schematic cross-sectional view of a projection screen embodiment of the present invention;

Fig. 12 is a schematic cross-sectional view of an embodiment of a projection screen of the present invention.

In the picture:

10-projection screen; 20-projection system; 101-substrate layer; 102-microstructure layer; 1021-unit lens; 103-reflective material layer; 104-diffusion layer; 105-coloring layer; 106-first substrate layer ; 1041-light diffusion material; 1051-light absorption material; Z-straight line perpendicular to the projection screen; O1-concentric circle center; O-geometric center; or; Y-projector.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The projection screen disclosed in the embodiment of the present invention can effectively improve the viewing field of view, reduce the restriction on the position of the viewer, ensure good viewing brightness and screen brightness uniformity in a large viewing area, and improve viewing experience .

As shown in Figures 2 to 6, a schematic diagram of a projection system of the present invention, the projection system includes a projector Y and a projection screen 10, the projection screen 10 is used to image the projection light emitted by the projector Y, from the projection screen Viewed from the normal direction of 10, the projector is located outside the area of the projection screen. Specifically, projector Y is located below the front side of the projection screen 10. Projector Y is a short-focus projector that transmits image light obliquely upward. On the projection screen 10, the projection screen 10 is provided with a microstructure layer 102 for converging the projection light. The microstructure layer 102 is composed of a number of unit lenses 1021. Specifically, a single unit lens 1021 is arranged along the The plane direction of the projection screen 10 is arranged in a curved shape, and the adjacent unit lenses 1021 are arranged according to a certain preset direction and spacing. As shown in FIGS. Ring lines, elliptical lines, arcuate lines, or other high-order curves, etc., set the wiring shape of the unit lens 1021 according to the convergence requirements of the projection light. On the section of the projection screen 10 in the thickness direction, the section of the unit lens 1021 The shape is zigzag, which can also be expressed as a triangular convex structure, and the unit lens 1021 has two surfaces at an angle to reflect and converge the projection light;

As shown in Figure 3, in the first schematic view of the microstructure layer 102, the unit lenses 1021 are arc-shaped, and the unit lenses 1021 in the microstructure layer 102 are arranged in concentric circles, that is, all the unit lenses 1021 have a common The concentric circle center O1 of the unit lens 1021 is arranged at intervals along the radial direction, and the concentric circle center O1 of the unit lens 1021 is located outside the area of the projection screen 10, that is, the microstructure layer is in the shape of an annular Fresnel lens with an offset structure, The center O1 of the concentric circles of the unit lens 1021 is specifically located below the projection screen 10, and the center O1 of the concentric circles is on a straight line passing through the geometric center O of the projection screen 10 in the vertical direction. Since the center of the concentric circles is located outside the area of the projection screen, the projection The unit lens on the screen area is a part of a perfect circle, that is, the unit lens is arc-shaped. In other words, the entire microstructure layer contains several arc-shaped unit lenses arranged radially along the center of the concentric circle; as shown in Figure 4 As shown in the second schematic diagram of the microstructure layer 102, the unit lenses 1021 are circular lines, and several unit lenses 1021 of the microstructure layer 102 are arranged in concentric circles, that is, all the unit lenses 1021 have a common concentric circle The center of circle O1, the unit lenses 1021 are arranged at intervals along the radial direction, and the concentric circle center O1 of the unit lenses 1021 coincides with the geometric center O of the projection screen 10; as shown in Figure 5, the third schematic diagram of the microstructure layer 102, the unit lens 1021 is an elliptical line, and the centers of all unit lenses 1021 coincide; as shown in FIG.

Divide the projection screen 10 into several imaging areas along the vertical direction, at least three imaging areas, or four, five or more imaging areas, and the microstructure layers within the scope of each imaging area are respectively Converge the projected rays to a converging point, all converging points are on the same straight line perpendicular to the projection screen, and the converging point of at least one imaging area does not coincide with the converging points of other imaging areas, the more the number of imaging areas is divided, It is possible to more finely control the converging direction of projection light incident on different positions on the projection screen, but the amount of data that needs to be calculated is relatively large, and the design is difficult. Therefore, it is generally preferred to divide the projection screen into upper, middle and lower three. The first imaging area is designed and calculated (the projection screen is divided into three imaging areas by two imaginary dotted lines in Fig. 2), and the upper imaging area converges all the projected light rays to the converging point A (that is, all positions in the imaging area have a positive impact on the projected light rays There is only one convergence point A, and the following meanings are the same), the middle imaging area converges all projection rays to convergence point B, the lower imaging region converges all projection rays to convergence point C, and convergence points A, B, and C Located on the same straight line Z perpendicular to the screen plane of the projection screen 10, the three points A, B, and C do not coincide with each other, or at least one of the three points at the convergence point A, B, and C does not coincide with other points, For example, point A and point C coincide into one point, but point B does not coincide with their two points, that is, the projection rays in the upper imaging area and the lower imaging area converge to the same point, while the projection rays in the middle imaging area converge to another point. a different point.

Further, the three imaging areas divided into the projection screen 10 in the vertical direction may be three imaging areas equally divided or three imaging areas not equally divided, depending on the viewing distance and the size of the projection screen. , viewer height, etc. to set it up.

In addition, the foregoing is to divide the projection screen 10 along the vertical direction of the projection screen, or to divide the projection screen along any divergence direction of the projection light emitted by the projector, because the projection screen relies on the unit lens 1021 to converge the projection light, as shown in the figure In the microstructure layer 102 shown in 3, the unit lens 1021 is a rotationally symmetrical circular arc structure on the projection screen 10, so no matter from which direction the projection screen 10 is divided, it can finally be equivalent to dividing the projection screen 10 from the vertical direction .

Further, the straight line Z perpendicular to the plane of the projection screen 10 intersects with the center line of the vertical direction of the projection screen, and the straight line Z is lower than the geometric center height of the projection screen, more preferably, the straight line Z is located on the projection screen 10 Outside the display area, that is to say, there is no intersection between the straight line Z and the projection screen 10, because in actual viewing, the height of the viewer's normal line of sight is usually located at or below the lower half of the projection screen, so that the viewer can view from the If a brighter image is seen on the projection screen, the projection screen needs to converge more projection light downwards, so the straight line where the converging point of the projection screen 10 is designed also needs to deviate downward from the area of the projection screen, so that the Viewers get brighter image display and brightness uniformity from the projection screen.

As shown in the schematic diagram of the projection system in Figure 7, the vertical distance L2 between the convergence point B and the screen plane of the projection screen 10 is greater than the vertical distance L1 between the convergence point A and the projection screen 10 screen plane, and also greater _than the vertical distance L1 between the convergence point C and the projection screen 10 screen plane The vertical distance L ₃ . The projection screen designed in this way can diverge the projection light incident on the middle area as far as possible, which is beneficial to solve the problem of uneven brightness in the middle of the projection screen and dark edges, and reduces the perception of nearby viewers. At the same time, it can also enable viewers in the distance to watch brighter images, so that the difference in image brightness experienced by those who are far away or near is not too large, thereby effectively improving the viewing field of view of the projection screen.

Further, the vertical distance L2 between the convergence point B and the plane of the projection screen 10 may be the same as the vertical distance L1 between the convergence point A and the plane of the projection screen 10, and greater than the vertical distance L3 between the convergence point C and the plane of the projection screen 10, which is beneficial Increases the brightness of images viewed by nearby viewers on the projection screen, suitable for situations where there are no distant viewers in a home scene.

Further, it may also be that the vertical distance L1 between the convergence point A and the plane of the projection screen 10 is greater than or equal to the vertical distance L3 between the convergence point C and the plane of the projection screen 10. Since the imaging area on the projection screen itself is far away from the projector, the upper imaging area The brightness of the image itself is low, and this design method can make the projection light in the imaging area on the projection screen converge more to the viewer at the middle distance, increasing the image brightness of the imaging area on the projection screen, while the imaging area under the projection screen Because the area itself is close to the projector, the image brightness of the lower imaging area itself is very high, reducing the projection light of the lower imaging area to converge to the viewer area, so that the viewer feels that the brightness of the lower area of the projection screen is reduced, so that the viewer feels The overall brightness of the projection screen 10 is more uniform, so this design is beneficial to improve the display brightness uniformity of the projection screen.

Furthermore, the vertical distance L2 between the converging point B and the plane of the projection screen 10 is greater than or equal to 6 meters, because if the designed distance L2 is less than 6 meters, the brightness of the projection screen felt by the viewers in the family scene will be extremely uneven and uneven. The field of view of the projection screen is extremely small, so it is not conducive to the popularization and application of the projection screen. Of course, the vertical distance L2 between the converging point B and the plane of the projection screen 10 cannot be designed to be infinite, so as to avoid sudden changes in the shape of the designed unit lens, resulting in that the unit lens is not easy to process and manufacture. It is generally preferred that the converging point B and the projection screen 10 The vertical distance L2 of the plane is less than or equal to 12 times the height of the projection screen.

Further, the vertical distance L3 between the convergence point C and the screen plane of the projection screen is greater than or equal to 2 meters, because if the designed distance L3 is less than 2 meters, too much light in the area under the projection screen is difficult to be received by the viewer, which will cause viewing If the brightness of the area under the projection screen felt by the audience is too low, it will affect the brightness uniformity of the projection screen and is not conducive to the actual use of the projection screen.

As a further explanation, as shown in FIG. 8, the projection system of the present invention is compared with the optical path of the projection system of the prior art. The optical path of the projection system of the prior art is shown in dotted line in FIG. 8, and the solid line in FIG. Represents the optical path designed for the projection system of the present invention. It can be known from the light path indicated by the dotted line in Fig. 8 that the projection screen 10 in the prior art is designed to converge the light emitted by the projector to a position 3 meters directly in front of the geometric center O of the screen, that is, the focal point of the arc-shaped unit lens 1021 The vertical distance between F and the screen is 3 meters. In practice, the viewer G is usually at a position of 3 meters or more in front of the screen, so that the viewer at the focal point can just receive the most light, so it is considered Able to see the brightest screen possible. But this design does not take into account the height difference of the viewer and the needs of multiple viewers watching side by side at the same time. The geometric center of the projection screen in the prior art is designed and manufactured assuming that the viewer's line of sight is located at and near the converging point F), the viewer can only receive very little light, so the brightness is too low to see The image on the screen is clear, but in practice it is difficult to find a viewer whose height can match this design, so the design of the prior art is very inapplicable, the compatibility is poor, and the problem of uneven brightness of the screen cannot be solved; and when the light is all Converging to the focus position (the converging area is very small), when there are multiple viewers watching side by side, only the viewers at the focus position can receive light, while other viewers can only receive very little light, so other The viewer feels that the brightness of the screen is also very low and uneven, so the design scheme of the prior art is not applicable.

The technical solution of the present invention solves the above-mentioned problems of the prior art. As shown by the solid line in FIG. Brand-new unit lenses are designed for different imaging areas on the projection screen 10. The unit lens 1021 is used to realize the function of converging projection light. As shown in FIG. 9, the unit lens 1021 is curved, and the unit lens 1021 in this embodiment is an arc shape, and the section of the unit lens 1021 in the thickness direction of the projection screen 10 is zigzag, the unit lens 1021 has two surfaces at an angle to reflect and converge the projected light rays, and the specific way to adjust the converging point position of the projected light rays Including: first, adjusting the angle of the surface of the unit lens 1021 relative to the plane direction of the projection screen 10; second, adjusting the tooth profile height of the unit lens 1021 (the height of the unit lens 1021 in the thickness direction of the projection screen 10); , adjust the pitch of the unit lens 1021 (the width of the unit lens 1021 in the plane direction of the projection screen 10), and adjust the converging point of each unit lens 1021 to the projection light by adopting one or more combinations of the above methods position, and then realize the adjustment of the converging point position of different imaging areas on the projection light. Through a variety of unit lenses with different structures, the projection light is converged to multiple different positions that the viewer can receive, and the viewing field of view of the projection screen is improved, and the brightness of the picture can be guaranteed in a large viewing field. And brightness uniformity, that is, when the viewer is 3 meters or more in front of the screen and watches the screen, there will be a large area that can receive sufficient projection light, so no matter whether the viewer is high or low, the number of viewers Whether the viewer is far or near, the brightness and brightness uniformity of the picture that can be viewed in this area are effectively improved. Therefore, the projection screen of the present invention improves the brightness of the screen, the uniformity of display brightness and the viewing field of view.

Further, as shown in FIG. 9 , a schematic structural diagram of a projection screen according to an embodiment of the present invention. It can be seen from the left view in FIG. The arc-shaped section is a concentric array structure composed of zigzag unit lenses 1021. From the front view in FIG. 5, it can be seen that the concentric circle center O1 of the concentric array is located outside the display area of the projection screen 10. The position of the machine is in the same direction, and the projection screen 10 is left-right symmetrical about the central axis passing through the concentric circle center O1 of the concentric circle array. In the actual manufacturing process and measurement process, it may or may not be completely symmetrical from left to right, and there will be 1mm to 2mm deviation.

Further, as shown in FIG. 10 , it is a schematic diagram of a cross-sectional embodiment of a projection screen. As shown in figure a in Figure 10, a diffusion layer 104 and a colored layer 105 are also included between the substrate layer 101 and the microstructure layer 102, and the diffusion layer 104 and the colored layer 105 are separated into two independent layers, and the arrangement positions of the two layers Alternatively, the other side of the substrate layer 101 is set as a rough surface, and the rough surface is formed by roughening the surface of the substrate. Here, the rough surface can be formed by sandblasting or surface roughening of the mold, followed by transfer printing with glue or spraying glue containing diffusion particles. The rough surface can further diffuse the light, play the role of uniform light, hardening protection and imaging. The microstructure layer 102 includes a plurality of unit lenses 1021 with a zigzag cross-section. The unit lenses 1021 protrude toward the back side of the projection screen. A reflective material layer 103 is arranged on the unit lenses 1021. The projection light emitted by the projector Y passes through the base. The material layer 101 and the microstructure layer 102 are finally reflected by the light-reflecting material layer 103 on the microstructure layer, and then emerge into the viewing range through the microstructure layer 102 and the substrate layer 101; as shown in figure b in Figure 10, the substrate The material layer 101 and the microstructure layer 102 also include a diffusion layer 104 and a colored layer 105, the diffusion layer 104 and the colored layer 105 are fused into one layer, the other side of the substrate layer 101 is set as a rough surface, and the microstructure layer 102 includes A plurality of zigzag unit lenses 1021 are provided with a reflective material layer 103 on the unit lenses 1021 .

Further, the rough surface can also be made with microstructures, which are used to increase the diffusion angle of the projection screen, which can make the diffusion angle of the projection screen in the horizontal direction larger than that in the vertical direction of the projection screen. Alternatively, the diffusion capacity of some overbright areas of the projection screen is only increased, so that the brightness of these overbright areas is reduced, and the brightness uniformity of the projection screen is improved.

Further, the other side of the substrate layer 101 can also be smooth, and an anti-reflection material is provided on the smooth surface, such as an anti-reflection film coated with high and low refractive index materials, for reducing oblique incident projections. The reflection loss of light enhances the display brightness of the projection screen.

As a further explanation, the substrate layer 101 may be composed of materials including but not limited to polyethylene, polypropylene, polystyrene, polyvinyl chloride, casein phosphopeptide, biaxial polypropylene, polycarbonate , Polyethylene terephthalate, polyamide, polyurethane, polymethyl methacrylate, polycarbonate, thermoplastic polyurethane elastomer and other flexible plastic or rubber materials, or glass, acrylic, ceramics, etc. have certain rigidity and transparency substrate.

As a further explanation, the diffusion layer 104 is provided with diffusion particles and resin materials, and these diffusion particles can uniformly scatter the light passing through the diffusion layer 104 to make the light intensity distribution more uniform. Diffusion particles include but are not limited to silicon dioxide particles, aluminum oxide particles, titanium oxide particles, cerium oxide particles, zirconium oxide particles, tantalum oxide particles, zinc oxide particles, magnesium fluoride particles, etc., and their particle diameters are preferably 5 nm to 200nm. It should be noted that when the diffusion particles are arranged in the diffusion layer 104, the diffusion particles can be uniformly distributed in the diffusion layer 104, or can be non-uniformly distributed in the diffusion layer 104. In order to achieve the best effect, preferably, the diffusion particles are evenly distributed. way within the diffusion layer 104 .

Furthermore, the diffusion layer 104 can also be set as a single-layer or multi-layer arc-shaped cylindrical micro-lens, which diffuses light through the arc-shaped surface of the arc-shaped cylindrical micro-lens, so as to increase the viewing field of view of the projection screen and improve the uniformity of display brightness. sex.

Further, a light-absorbing material and a resin material are arranged in the colored layer 105, and the light-absorbing material can absorb some unwanted light (such as ambient light) and selectively transmit the required light. The light-absorbing materials here include but are not limited to various pigments, dyes or carbon black, black iron oxide, etc., which play the role of filtering and toning.

Further, the reflective material layer 103 has a specular reflective function or a diffuse reflective function, that is, the reflective material layer 103 can be a specular reflective layer or a diffuse reflective layer. Both the specular reflection layer and the diffuse reflection layer can reflect light. The difference is that the surface of the specular reflection layer is smooth like a mirror surface. The reflected light and incident light satisfy the optical reflection theorem and can form a clear image. Generally, it can be made by electroplating; The surface of the diffuse reflection layer is slightly rough, and the reflected light is transmitted in all directions without regularity and cannot form a clear image. It is generally produced by printing and spraying.

As a further supplementary description, the reflective material layer 103 can be set to have a certain degree of light transmission, so that the ambient light entering the projection screen can pass through the reflective layer, so that the ambient light is not reflected to the viewing area. The contrast ratio has a good effect.

Further, pigments/dyes that can reflect red, green and blue light and absorb/transmit other colors of visible light can also be added to the reflective material layer 103 to absorb more ambient light and improve the contrast of the projection screen.

Furthermore, the reflective material layer may not be arranged on the unit lens of the projection screen, so that the projection screen can be applied to the scene of the rear projection system, so that the projector and the viewer are respectively located on both sides of the projection screen.

Further, the surface of the substrate layer can also be a smooth surface, which can obtain ultra-high-definition images, and can also be provided with a microstructure whose horizontal diffusion angle is greater than the vertical diffusion angle, so that the horizontal viewing angle of the projection screen is larger, which can Gain a larger horizontal viewing field of view. It can also be provided with microstructures with diffusion angle anisotropy, that is, the microstructures have different diffusion capabilities for light in various directions. According to the brightness of different positions on the projection screen, the diffusion angle of the microstructures is large at positions with high brightness. Reduce the brightness, and the diffusion angle of the microstructure at the position with low brightness is small to ensure that the brightness does not decrease, so that the display brightness of the projection screen is more uniform and a larger viewing field can be obtained.

As an optional manner, as shown in FIG. 11 , it is a schematic cross-sectional view of a projection screen. As shown in figure a in Figure 11, the other side of the substrate layer 101 is provided with a first substrate layer 106, a diffusion layer 104 and a colored layer 105 in sequence, and the diffusion layer 104 and the colored layer 105 are separated into two independent layers, The positions of the two layers can be interchanged, the outer surface of the first substrate layer 106 is set as a rough surface, the microstructure layer 102 includes a plurality of zigzag unit lenses 1021, and a reflective material layer 103 is arranged on the unit lenses 1021; as shown in Figure 11 As shown in figure b, the other side of the substrate layer 101 is provided with a first substrate layer 106, a diffusion layer 104 and a colored layer 105 in sequence, the diffusion layer 104 and the colored layer 105 are fused into one layer, and the first substrate layer The outer surface of 106 is set as a rough surface, the microstructure layer 102 includes a plurality of zigzag unit lenses 1021 , and the reflective material layer 103 is arranged on the unit lenses 1021 .

As an optional manner, as shown in FIG. 12 , a schematic cross-sectional view of a projection screen. The base material layer 101 is provided with a light diffusion material 1041 and a light absorption material 1051. The light diffusion material 1041 contains diffusion particles. The light diffusion material is provided in the base material layer 101, which can further enhance the scattering angle of light inside the screen and increase the brightness of the screen. The display is more uniform; the light-absorbing material 1051 contains a light-absorbing material, which can play the role of filtering and toning.

Further, the material of the unit lens of the present invention includes but not limited to radiation curable resin, thermosetting resin, and reactive curable resin. The method of using the above-mentioned raw materials to make the unit lens is to use a roller mold made of the unit lens, and transfer the raw material to Printed onto the substrate material.

Further, the projection screen of the present invention also includes a black backboard, a decorative frame and a pendant, the black backboard is arranged on the side of the reflective material layer away from the microstructure layer, the decorative frame is wrapped around the optical projection screen, and the pendant is arranged on the black backplane. The side of the plate away from the microstructure layer.

Further, the black backboard can be closely attached to the reflective material layer through double-sided adhesive or EVA hot-melt adhesive, and black paint can be placed on the surface of the black backboard to absorb unnecessary light incident on the black backboard , can properly improve the contrast of the projection screen.

Furthermore, the decorative frame is installed around the black backboard, enclosing each layer structure of the projection screen in the thickness direction of the projection screen, to fix and beautify the appearance of the projection screen, and to divide and form projection display areas. The fixing method between the decorative frame and the black backboard can be pasted by double-sided tape, or fixed by screws/bolts.

Further, the pendant is fixed on the corresponding position of the black backboard by means of double-sided adhesive tape or screw fixing, so as to facilitate subsequent installation of the projection screen on the wall.

As a further supplementary description, the pendant can also be replaced with a magnetic material, so as to install the projection screen on the wall through magnetic adsorption, so as to ensure the aesthetics of the wall.

The above are only preferred implementations of the present invention, and it should be noted that the above preferred implementations should not be regarded as limiting the present invention, and the scope of protection of the present invention should be based on the scope defined in the claims. For those skilled in the art, without departing from the spirit and scope of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

A projection screen, characterized in that, the projection screen is provided with a microstructure layer for converging projection light, and the projection screen is divided into several imaging areas along the vertical direction, and the microstructure layer within the range of each imaging area separates The projection light converges to a convergence point, all the convergence points are on the same straight line perpendicular to the projection screen, and the convergence point of at least one imaging area does not coincide with the convergence points of other imaging areas.
The projection screen according to claim 1, wherein in the vertical direction of the projection screen, the vertical distance from the convergence point of the imaging areas in the middle to the projection screen is greater than the convergence of the imaging areas at the top and the imaging areas at the bottom The vertical distance from the point to the projection screen;

Alternatively, the vertical distance from the converging point of the central imaging area to the projection screen is equal to the vertical distance from the converging point of the top imaging area to the projection screen, and greater than the vertical distance from the converging point of the bottom imaging area to the projection screen.
The projection screen according to claim 2, wherein the vertical distance from the converging point of the top imaging area to the projection screen is greater than or equal to the vertical distance from the converging point of the bottom imaging area to the projection screen.
The projection screen according to claim 2, wherein the vertical distance from the convergence point of the central imaging area to the projection screen is less than or equal to 12 times the height of the projection screen.
The projection screen according to claim 2, wherein the vertical distance from the convergence point of the central imaging area to the projection screen is greater than or equal to 6 meters, and the vertical distance from the convergence point of the bottom imaging area to the projection screen is greater than or equal to 2 meters and Less than 6 meters.
The projection screen according to any one of claims 1 to 5, wherein the imaging area is equally divided or not equally divided along the vertical direction of the projection screen.
The projection screen according to any one of claims 1 to 5, wherein the projection screen is vertically divided into three imaging areas: upper, middle and lower.
The projection screen according to any one of claims 1 to 5, wherein the straight line where the convergence point is located is lower than the height of the geometric center of the projection screen.
The projection screen according to claim 8, characterized in that, the line where the convergence point is located intersects with the line vertically passing through the geometric center of the projection screen, and the intersection point is located outside the area of the projection screen.
The projection screen according to any one of claims 1 to 5, characterized in that the microstructure layer comprises several unit lenses arranged in concentric circles in the plane direction of the projection screen and having a zigzag cross-section.
The projection screen according to claim 10, wherein the centers of the concentric circles of the unit lenses are located outside the area of the projection screen.
A projection system, characterized by comprising the projection screen according to any one of claims 1 to 11 and a projector for projecting image light to the projection screen.
The projection system of claim 12, wherein the projector is located outside the area of the projection screen viewed from a normal direction of the projection screen.