WO2020042961A1 - 投影屏幕及投影系统 - Google Patents

投影屏幕及投影系统 Download PDF

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Publication number
WO2020042961A1
WO2020042961A1 PCT/CN2019/101428 CN2019101428W WO2020042961A1 WO 2020042961 A1 WO2020042961 A1 WO 2020042961A1 CN 2019101428 W CN2019101428 W CN 2019101428W WO 2020042961 A1 WO2020042961 A1 WO 2020042961A1
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WO
WIPO (PCT)
Prior art keywords
screen
projection
frame
elastic tension
cloth
Prior art date
Application number
PCT/CN2019/101428
Other languages
English (en)
French (fr)
Inventor
李建军
杨长明
钟强
赵云
Original Assignee
青岛海信激光显示股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 青岛海信激光显示股份有限公司 filed Critical 青岛海信激光显示股份有限公司
Publication of WO2020042961A1 publication Critical patent/WO2020042961A1/zh
Priority to US17/182,701 priority Critical patent/US11442354B2/en

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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
    • 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
    • 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
    • G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
    • 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
    • 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
    • G03B21/64—Means for mounting individual pictures to be projected, e.g. frame for transparency

Definitions

  • the present disclosure relates to the field of projection display, and in particular, to a projection screen and a projection system.
  • Laser projection has gradually occupied the market because of its wide color gamut, high brightness, and long life.
  • the projection screen of a projection display system usually includes different types such as a soft screen and a hard screen.
  • the hard curtain has a better display effect because of its good optical gain uniformity, color reduction, and flatness.
  • the disclosure provides a projection screen and a projection system, which can fix the screen panel and maintain the screen panel with a good flatness.
  • the present disclosure provides a projection screen
  • the connecting cloth covers the back of the screen board and extends beyond at least one side edge of the back of the screen board; the first end of each elastic tension member is connected to one side edge of the connecting cloth, and the second end is connected to the screen frame to pass through The tension of the elastic tension member stretches the connection cloth and the screen board to a flat state;
  • the present disclosure provides a projection system including a projection device and a projection screen as described above.
  • the projection device is configured to project a projection screen onto a screen panel of the projection screen.
  • FIG. 1 is a schematic structural diagram of a front projection optical screen in the related art
  • FIG. 2 is a schematic structural diagram of a backplane-type fixing structure in the related art
  • FIG. 3 is a schematic structural diagram of a projection screen provided by Embodiment 1 of the present disclosure.
  • Embodiment 4 is an exploded schematic diagram of a projection screen provided by Embodiment 1 of the present disclosure.
  • FIG. 5 is a schematic cross-sectional view of a projection screen provided by Embodiment 1 of the present disclosure.
  • FIG. 6 is a schematic diagram of a partial structure of a screen frame in a projection screen provided by Embodiment 1 of the present disclosure
  • FIG. 7 is a schematic diagram of a rear structure of a projection screen provided in Embodiment 1 of the present disclosure.
  • Embodiment 8 is a schematic diagram of a rear structure of another projection screen provided by Embodiment 1 of the present disclosure.
  • FIG. 9 is a schematic diagram of a partial structure of a screen frame in a projection screen according to Embodiment 2 of the present disclosure.
  • FIG. 10 is a schematic cross-sectional view of a partial structure of a projection screen provided in Embodiment 2 of the present disclosure.
  • FIG. 11 is a schematic structural diagram of a support member provided by an embodiment of the present disclosure.
  • FIG. 1 is a schematic structural diagram of a front projection optical screen in the related art.
  • a hard curtain generally includes an optical structure layer as shown in FIG. 1: a colored layer 101, a diffusion layer 102, a Fresnel lens layer 103, a reflective layer 104, and the like.
  • the coloring layer 101 is located at the outermost side of the projection screen, and the projected image beam enters first and finally exits through this layer.
  • the main role of the coloring layer is to improve the color reduction ability of the projection screen.
  • the substrate layer includes a colored layer and a hard film layer; the hard film layer mainly plays a protective role; the diffusion layer 102 is mainly used for homogenizing the uneven incident light and expanding the angle of the outgoing light; Fresnel
  • the lens layer 103 is used for collimating and collimating the incident light beams within a certain angular range, and diverging the light beams reflected by the reflection layer 104.
  • the reflective layer 104 is usually an aluminum reflective film layer, which is plated on the outside of the Fresnel lens layer 103.
  • FIG. 2 is a schematic structural diagram of a backplane-type fixing structure in the related art.
  • the backplane-type fixing structure includes a decorative frame 201 and a flat-shaped back support plate 204.
  • the hard curtain 202 and the back support plate 204 are fixed by using an adhesive 203, and then
  • the decorative frame 201 is connected to the back support plate 204 to complete the support and fixation of the hard curtain 202. In this way, the flatness of the hard curtain 202 can be maintained by the rigidity of the back support plate 204 and deformation of the hard curtain 202 can be avoided.
  • the entire back panel is used to fix the hard curtain.
  • the area of the back support plate is large.
  • large-size plates are prone to deformation such as bulging.
  • the optical screen is glued to the back plate.
  • the uneven coating of the board will also cause the unevenness of the bonding, which will affect the flatness of the entire hard curtain.
  • this back-plate-type fixing method also makes the entire screen very heavy and inconvenient to transport. And suspension, limiting the enlargement of the projection size. The above problems need to be solved urgently.
  • FIG. 3 is a schematic front structural diagram of a projection screen provided by the first embodiment of the present disclosure.
  • FIG. 4 is an exploded view of the projection screen provided by the first embodiment of the present disclosure.
  • FIG. 5 is a schematic cross-sectional view of a projection screen provided by Embodiment 1 of the present disclosure.
  • FIG. 6 is a schematic diagram of a partial structure of a screen frame in a projection screen provided in Embodiment 1 of the present disclosure.
  • FIG. 7 is a schematic diagram of the rear structure of the projection screen provided by the first embodiment of the present disclosure.
  • the projection screen provided in this embodiment includes a hard screen board 1, a soft connection cloth 2, a screen frame 3 surrounding the peripheral side of the screen board 1, and a plurality of elastic pulling forces.
  • the front side of the screen panel 1 is the projection light receiving surface.
  • the back side of the screen panel 1 is connected to the connection cloth 2 in an adhesive manner.
  • the connection cloth 2 covers the back of the screen panel 1 and extends out of the screen panel. Except for at least one side edge of the back surface, the first end of each elastic tension member 4 is connected to one edge of the connection cloth 2 and the second end is connected to the screen frame 3 so as to be connected by the tension of the elastic tension member 4 The cloth 2 and the screen panel 1 are stretched to a flat state.
  • the screen plate 1 in the projection screen is usually made of a hard material, and as described above, it includes multiple layers of optical structures, which have a certain degree of hardness, brittleness and rigidity compared to a soft screen. Therefore, when the screen panel 1 is stretched, a relatively flat surface can be formed. In this way, at least a part of the front surface of the screen panel 1 can be used as a light receiving area for projecting an image, so that a screen and an image are projected on the front surface of the screen panel 1 for display.
  • the projection screen in this embodiment further includes a soft connection cloth 2, which can be bonded to the hard screen board 1 and connected to other fixed structures. , Thereby completing the fixing of the screen panel 1.
  • the connection cloth 2 and the screen board 1 are adhered to each other, so the degree of extension of the connection cloth 2 also affects the curling or unfolding of the screen board 1.
  • the connection cloth 2 has a sufficient size to cover at least an area on the back of the screen panel 1 opposite to the front light receiving area.
  • connection cloth 2 the back surface of the light receiving area is adhered to the connection cloth 2.
  • the connecting cloth 2 when the connecting cloth 2 is in a flat and stretched state, the light receiving area for projecting the image on the screen panel 1 will also be stretched, thereby achieving better picture display quality.
  • the screen panel 1 Since the screen panel 1 is usually suspended vertically when projecting a picture, the rigid screen panel 1 is more likely to hang down naturally due to its own weight. At this time, the screen panel 1 will mainly inward on the left and right sides. Curl or flared. In order to keep the screen panel 1 flat, in some embodiments, the region on the back of the screen panel 1 corresponding to the front light receiving region, the upper edge region of the screen panel, and the lower edge region of the screen panel may all cover the connecting cloth 2. At this time, the connecting cloth 2 spans the entire screen panel 1 in the vertical direction, so that both the upper edge region and the lower edge region of the screen panel 1 can be stretched by the connecting cloth 2. Since the screen panel 1 is generally horizontal, The width is greater than the width in the vertical direction.
  • connection cloth 2 is used to strengthen and fix the upper and lower sides of the screen panel 1, which can not only prevent the upper and lower sides from curling inward or outward, but also suppress the curling phenomenon on the left and right sides, so that The entire screen panel 1 has better flatness in all directions.
  • the connecting cloth 2 covers the entire back of the screen panel 1. In this way, the entire rigid screen board 1 can be adhered to the soft connecting cloth 2, so that the stretching of the connecting cloth drives the hard screen board 1 to achieve stretching and stretching, thereby maintaining good flatness.
  • the screen board 1 can be affixed to the central position of the connection cloth 2, and the edge of the connection cloth 2 will protrude to the outside of the edge of the screen board 1 for connection with other structures.
  • connection cloth 2 when bonding the connection cloth 2 to the screen board 1, the connection cloth 2 can also be bent from the edge of the screen board 1 to the front of the screen board 1 after bonding to the back of the screen board 1, and then The front edge portions of the screen panel 1 are bonded together, and finally continue to extend to the outside of the edges of the screen panel 1 in the opposite direction.
  • the projection screen also includes a plurality of elastic tension members 4 which have elasticity, so when one end of the elastic tension member 4 is fixed at When the edge of the connecting cloth 2 is connected to the screen frame 3 surrounding the screen panel 1 at the other end, the connecting cloth 2 can be stretched by virtue of its own elasticity, forcing the connecting cloth 2 to open to a flat stretched state.
  • the direction of the elastic force of the elastic tension member 4 is generally the direction of the tension, that is, when the elastic tension member 4 is connected between the connection cloth 2 and the screen frame 3, the elastic tension member 4 can connect the connection cloth 2 Stretch toward the outer screen frame 3 until the connecting fabric 2 is stretched to an extended state.
  • the screen board 1 is also stretched outward until the screen board 1 is stretched to a flat surface. status.
  • the screen panel 1 can ensure better flatness, so that the pictures and images projected on the front of the screen panel 1 have better display effects, and avoid the projected screen from being skewed and deformed.
  • the projection screen in this embodiment can fix the screen panel 1 through the connection cloth 2, the elastic tension member 4, and the screen frame 3.
  • the connection cloth 2 can be rendered by the stretching effect of the outer elastic tension member 4.
  • a tensile force is also applied to the screen panel 1 through force transmission, so that the rigid screen panel 1 also appears in a stretched and unfolded state, which is beneficial to the rigid screen panel 1 to achieve flatness.
  • the rigid screen panel 1 may generally be composed of a hard layer, a Fresnel structure layer, and a projection layer, etc., which has a certain strength and rigidity, and can have a certain verticality in a vertical free-sag state.
  • the screen makes the screen look flat, but because it still has a certain degree of softness, if there is no support or interference by external forces, the rigid screen can still not meet the flatness required for display.
  • the uneven screen will make the laser projection
  • the screen is distorted, blurred, uneven brightness, or other degradation problems.
  • connection cloth 2 In order to fix the rigid screen plate 1, the connection cloth 2 is used as the connection structure.
  • the connection cloth 2 generally has the characteristics of inelasticity, ultra-thin, dense and high strength.
  • An integrated structure can be formed between the two to facilitate the transmission of force, so that the screen panel 1 can be stretched following the deformation of the connecting cloth 2.
  • the connecting cloth 2 may generally be a soft cloth. In this way, the connecting cloth 2 can better transmit the force when being stretched, and has relatively stable properties, and can adapt to a wide range of environments. For example, it can maintain a good flatness between the ambient temperature of -10 ° C to 40 ° C. And reliability.
  • the color of the connecting cloth 2 can be generally black.
  • the connecting cloth 2 can cover the area on the back of the screen panel 1 opposite to the light-receiving area, and play a role of shielding and protecting the screen panel 1.
  • the rigid screen plate 1 is an optical structure layer and has a certain light transmittance.
  • the innermost layer is a reflective layer, and the active surface of the reflective layer is to reflect the projected light (such as Aluminum coating), but because 100% reflectance cannot be achieved, all of the light will be transmitted through, which will cause the image contrast to decrease.
  • the back of the aluminum film is shielded by a black connecting cloth, which is beneficial to the light not leaking, and at the same time it can prevent scratches on the back of the screen.
  • the optical structure layer plays a protective role.
  • an adhesive that is, an adhesive manner is usually used to achieve the connection and fixing between the two.
  • an adhesive that is, an adhesive manner is usually used to achieve the connection and fixing between the two.
  • the back of the screen board 1 and the connecting cloth 2 are adhered together by an adhesive method.
  • the adhesive used to connect the screen panel 1 and the connecting cloth 2 usually has a thermal expansion coefficient similar to or the same as that of the screen panel 1, or has a certain ductility, so that the screen panel 1 generates heat due to temperature changes.
  • the adhesive will play a certain buffering effect, reduce the impact of the screen panel 1 on the projection screen due to thermal expansion and contraction deformation, and also help maintain the flatness of the rigid screen panel 1 to prevent
  • the two have different expansion coefficients and different expansion ratios, which causes stress on the screen panel 1 and affects flatness.
  • the side of the connection cloth 2 that is bonded to the connection board 1 usually has a polyurethane (PU) coating.
  • PU polyurethane
  • This can increase the surface energy of the connection cloth 2 and thus improve the connection cloth. 2 Adhesion to the adhesive.
  • a polyurethane coating can be sprayed on the connecting cloth 2 to achieve better adhesion to the surface of the connecting cloth 2.
  • the screen frame 3 is generally a frame structure, and the screen frame 3 surrounds a rectangular or square hollow area, which can be used for placing the screen panel 1 and the screen frame 3 It can surround the edge of the screen board 1 to provide protection for the screen board 1, and the screen frame 3 and the connecting cloth 2 are connected by a deformable or displaceable connection member or connection structure, for example, an elastic tension member 4 to realize the connection.
  • the specific structure and connection relationship of the frame 3 are shown in FIG. 3 to FIG. 7.
  • the screen frames on the upper side and the lower side of the screen panel 1 are taken as examples for description. It can be understood that the structure of the left and right sides of the screen frame 3 can also be selected to have a structure and connection relationship similar to those of the upper and lower sides, which will not be repeated here.
  • the edges of the connecting cloth 2 may have a reinforcing structure to avoid connecting the edges of the connecting cloth 2 when connecting with the elastic tension member 4 or the screen frame 3. Tearing deformation occurs.
  • the reinforcing structure may be a reinforcing ring riveted on the connecting cloth 2, or a thickened cloth on the edge portion of the connecting cloth 2.
  • the thickened fabric can be connected to the connecting fabric 2 by means such as sewing.
  • the connecting member or connecting structure for connecting the screen frame 3 and the connecting cloth 2 may be of various structures and types, for example, it may be a spring or an elastic rubber piece, an elastic silicone piece, or the like, for elastic connection by using its own deformation. Connection parts, or magnetic adsorption parts.
  • an elastic tension member such as a spring or an elastic rubber can use its own elastic deformation to generate a tension force for connecting the screen frame 3 and the connection cloth 2, and a magnetic adsorption member can be generated for connection by relying on the mutual adsorption between the magnetic members. Pull force of the screen frame 3 and the connecting cloth 2.
  • connection between the connection cloth 2 and the screen frame 3 when the connection between the connection cloth 2 and the screen frame 3 is achieved by using the elastic tension member 4, the connection between the connection cloth 2, the elastic tension member 4, and the screen frame 3
  • the size of the screen frame 3 may be larger than the size of the connection cloth 2, and therefore the screen frame 3 is located outside the edge of the connection cloth 2.
  • one end of the elastic tension member 4 can be connected to the edge of the connection cloth 2, and the other end of the elastic tension member 4 projects outward from the edge of the connection cloth 2 and is fixed to the screen frame 3 located outside the connection cloth 2.
  • connection cloth 2 can be fixed at the center of the screen frame 3 by the elastic tension member 4, and the connection cloth 2 can be stretched by the elastic force of the elastic tension member 4 to keep the connection cloth 2 in a flat and extended state.
  • the length of the connecting cloth is larger than the size of the screen frame in the length or width direction or the surrounding direction, so that the edges of the connecting cloth are easily extended, wrap around the outer edge of the screen frame, and are hooked to the elastic tension member.
  • the elastic tension member 4 may be provided at other positions to reduce the area of the elastic tension member 4 and the screen frame 3 on the front surface of the screen panel 1 of the projection screen.
  • the screen frame 3 may include an outer edge support portion 31 which is supported on the back of the edge of the screen panel 1 and protrudes beyond the screen panel 1, and the edge of the connection cloth 2 extends to The outer edge of the outer support portion 31 is bent backward to be connected to the elastic tension member 4 after wrapping the outer edge of the outer support portion 31.
  • the outer edge supporting portion 31 is adhered to the side of the connection cloth 2 facing away from the screen panel 1 and abuts against the back of the edge of the screen panel 1. Since the screen frame 3 is generally a rigid structure, the outer edge support portion 31 can achieve good contact support for the back surface of the screen panel 1 through the soft connection cloth 2. Meanwhile, the outer edge supporting portion 31 is located on the outer edge of the screen frame 3, that is, the outermost region of the screen frame 3.
  • the edge of the connecting cloth 2 is located outside the edge of the screen board 1 and can continue to protrude outward, and from the outside of the outer support portion 31 to the rear area of the screen frame 3 , Wrap the edge of the outer support portion 31 and connect with the elastic tension member 4.
  • the connecting cloth 2 is equivalent to hanging on the edge of the outer support portion 31, and the edge of the outer support portion 31 can be used as a support point to support the connecting cloth 2.
  • the edge of the outer support portion 31 can be equivalent to a fixed pulley, so that the connecting cloths 2 on both sides of the outer support portion 31 rely on the support of the outer support portion 31 to move in two different directions.
  • the setting position of the elastic tension member 4 is no longer limited to the outside of the edge of the connecting fabric 2, but can be set in the coverage area when the connecting fabric 2 is extended.
  • the first end of the elastic tension member 4, that is, the end connected to the edge of the connecting cloth 2 may be located outside the second end of the elastic tension member 4.
  • the elastic tension member 4 can be hidden in the back direction of the screen panel 1, so that the elastic tension member 4 is covered by the front screen panel 1 and the connecting cloth 2 and is difficult to see from the front of the projection screen.
  • the area outside the edge of the screen panel 1 no longer has the elastic tension member 4, but only includes the connecting cloth 2 and the screen frame 3. Therefore, the formed border region has a smaller width, which can effectively improve the appearance of the projection screen. display effect.
  • the screen frame 3 is a hollow frame, and its cross section may be a hollow shape, such as a hollow rectangle. Since the cross section of the screen frame 3 is hollow, as shown in FIG. 8, a reinforcing beam or an internal cavity of the cross section may be provided. Reinforcement ribs to improve the overall structural strength of the screen frame 3.
  • the screen panel 1 since the screen panel 1 is generally composed of a hard material, thermal expansion and contraction may occur when the external ambient temperature changes. When the screen panel 1 undergoes thermal expansion and contraction, if the edge of the screen panel 1 exceeds the outer edge of the screen frame 3, a phenomenon such as bumps may occur. In order to ensure the projected picture quality, the edge of the outer supporting portion 31 is usually located outside the edge of the screen panel 1. At this time, the screen frame 3 can provide sufficient positioning and protection for the screen panel 1 when the external environment changes.
  • the direction of the tension of the elastic tension member 4 and the plane where the screen panel 1 is located can be kept parallel or close to a parallel angle. This can bring two advantages: On the one hand, the overall volume and thickness of the projection screen can be reduced. When the elastic tensile member 4 is elastically deformed, the direction of the elastic deformation is located in the plane where the screen panel is located, or it has a relatively large plane.
  • a small included angle, and therefore a small deformation in the thickness direction of the projection screen, can effectively reduce the thickness of the projection screen; on the other hand, when the direction of the tension of the elastic tension member 4 is parallel to the plane on which the screen plate 1 is located, It is also easy to make the screen panel 1 stretch along the plane on which it is located.
  • the tension direction of the elastic tension member 4 is at an angle of 45 degrees or less with the plane on which the screen panel 1 is located, that is, the soft connecting cloth 2 is folded along the outer edge of the outer support portion 31, and then the A certain slope of the back of the supporting portion along the outer side is tightened downward by the elastic tension member 4, so that the direction of the tension of the elastic tension member 4 forms a certain acute angle with the plane where the screen panel 1 is located. Due to the aforementioned function principle of the fixed pulley, the screen panel 1 is always subjected to a tensile force extending outward along the plane where the screen panel 1 is located by virtue of the transmission of the connecting cloth 2 force, and it is easy to keep the screen panel 1 flat.
  • the second embodiment provides another projection screen structure.
  • FIG. 10 is a schematic cross-sectional view of a projection screen structure provided in Embodiment 2 of the present disclosure
  • FIG. 9 is a partial cross-sectional schematic view of a projection screen structure provided in Embodiment 2 of the present disclosure.
  • the outer support portion 31 has a support portion 312 parallel to the plane where the screen panel 1 is located.
  • the support portion 312 may be provided with a plurality of ribs 313 arranged at intervals.
  • the ribs 313 provided on the side facing the screen panel 1 all protrude toward the screen panel 1 and the heights of the ribs 313 are equal, so that the tops of the plurality of ribs 313 can be supported on the back side of the screen panel 1 together.
  • the support portion 312 is structurally reinforced, and on the other hand, a support point is formed on the screen panel 1. Since the support portion 312 and the plane on which the screen panel 1 is located are parallel to each other, and the heights of the protruding ribs 313 are kept the same, the supporting portion 312 and the protruding ribs 313 can form a good planar support for the screen panel 1.
  • an inward rib 313 may be formed in the lower portion of the support portion 312, and the side of the support portion 312 facing the screen plate 1 may be set to a flat surface, so that a large area of contact can be maintained.
  • the screen frame 3 is provided with a support surface that is parallel to the screen panel 1, the contact area of the two is increased, and the contact positions are basically on a plane, and the adhesion is improved, so that the screen panel 1 is favorable for having a good flatness.
  • it is also conducive to reducing the overall thickness of the entire screen panel.
  • the elastic tension member 4 and the connection cloth 2 and the elastic tension member 4 and The screen frames 3 also have a variety of different connection methods.
  • the screen frame 3 is a rigid body, it can be connected to the elastic tension member 4 by a commonly used fixing method such as snap connection, screw fastener connection, or riveting.
  • the connecting cloth 2 is made of a relatively soft material, it is not convenient to directly connect with the elastic tension member 4, so it is usually necessary to fix a rigid connection structure on the connecting cloth 2 and use the connecting structure to connect the connecting cloth 2 and the elastic pulling force. Pieces 4 are connected together.
  • At least one rigid bar member 21 for connecting with the elastic tension member 4 is provided on the edge of the connection cloth 2.
  • the edges of the connecting cloth 2 can be enclosed in a closed shape, so that the rigid bar member 21 can be fixed inside the closed shape, thereby realizing the rigid bar member 21 And connection cloth 2.
  • the rigid rod member 21 may have a variety of different shapes and structures, for example, it may be a straight rod structure.
  • the edges of the connecting cloth 2 can be curled inward and sewn together with the inside of the connecting cloth 2 so that the edge portion of the connecting cloth 2 can form a closed hole for the straight rod-shaped rigid bar member 21 to pass through. Set in it.
  • the connecting cloth 2 when the rigid bar member 21 is moved under the pulling force of the elastic pulling member, the connecting cloth 2 will also move with it and be stretched into a flat stretched state.
  • the rigid rod member 21 may also be directly sewn on the edge of the connecting cloth 2.
  • the connecting cloth 2 can be connected to the elastic tensile member 4 through the rigid bar member 21, the rigid bar member can be used to carry the force, which can make the edge of the connecting cloth 2 less prone to tearing or damage, and compared with hanging directly Connected to a connecting cloth, such as a hole or a ring. Since the number of elastic tension members is limited, the tensile force of a limited number of elastic tension members through the rigid rod member can be applied from the point of application to the direction of the rigid rod member. Homogenization is performed so that the tensile force can be evenly applied to the connecting cloth, so that the tensile force of the connecting cloth on the rigid screen board is uniform throughout, which is more conducive to achieving uniform flatness.
  • the elastic tension member 4 may generally be a pulling spring, and one end of the pulling spring may be connected to the rigid bar member 21 by hanging or the like, and the spring The other end is fixed to the screen frame 3.
  • the end of the tension spring connected to the rigid bar member 21 may be a hook or a ring, so as to be hung and connected to the rigid bar member 21.
  • the elastic tension member 4 may also be an elastic connection structure commonly used by those skilled in the art, such as a rubber body, and is not described herein again.
  • a connecting structure is also provided on the side of the outer support portion 31 remote from the screen panel 1.
  • the elastic tension member 4 is a tension spring
  • a side of the outer support portion 31 remote from the screen panel 1 is provided with a suspension end 314, and the end portion of the suspension end 314 is larger than The size of the root of the suspension end 314, the hook opening at the lower end of the spring is slightly larger than the root of the suspension end 314 but smaller than its end.
  • the cross-sectional shape of the end portion of the suspension end 314 is generally circular, or a drop shape.
  • the elastic tension member 4 may also have a corresponding shape.
  • the elastic tension member 4 is a tension spring, and at least one end of the elastic tension member 4 is a circular arc that approximates a suspension ring.
  • the suspension end 314 can be hooked into the circular arc of the elastic tension member 4 and is not easy to follow The arc is loosened, so the connection is more reliable. And it can also prevent the workers from springing when the tension spring is hooked, which will cause injuries to the workers.
  • each rigid bar member 21 may be correspondingly connected to a plurality of elastic tensile members 4.
  • the rigid bar member 21 is a straight rod
  • multiple elastic tension members can be connected to each straight rod, and the multiple elastic tension members are spaced at different sections of the straight rod, which can effectively simplify the overall structure of the projection screen. .
  • the rigid bar member 21 may also be connected one-to-one with the elastic tensile member 4. This connection method is generally applicable to structures with a small external size such as the rigid bar member 21 having a closed ring.
  • the elastic tension member 4 itself needs to select an elastic material with adaptive environmental cold and heat changes, and can adapt to changes according to changes in ambient temperature or force.
  • the elastic tension member 4 is used as an example to illustrate.
  • the weight of the screen plate 1 is usually 5 kg (the weight of the connecting cloth 2 is light and can be omitted). In this way, the effective number of turns of the spring is 6 turns and the free height is about 23 mm.
  • the spring will be stretched to 30mm, that is, the extension is 7mm.
  • the elastic tension members 4 can be arranged at intervals and have a suitable arrangement density. In this way, on the one hand, a plurality of elastic tension members 4 can be used to provide sufficient indirect tensile force to the screen panel 1; on the other hand, the elastic tension members 4 have a proper number, and can also prevent installation when the number of elastic tension members 4 is too large. difficult. Generally, when the distance between adjacent elastic tension members is about 134 mm, the screen panel 1 can be fixed while ensuring that the screen panel 1 has sufficient flatness.
  • a plurality of elastic tension members 4 may be disposed at intervals around the screen panel 1, for example, disposed at equal intervals in a symmetrical direction.
  • the screen panel 1 is subject to the pulling force of the elastic tensile member 4 in the four directions of up, down, left, and right, so that the screen panel 1 can be effectively stretched in all directions to maintain a flat state.
  • a plurality of elastic tension members 4 can also be arranged at intervals on the upper and lower sides of the screen panel 1, so that the rigid screen panel 1 will be subject to the vertical tensile force in the entire screen width direction. It is equivalent to strengthening and fixing the direction of the upper and lower sides of the screen, and fixing the upper and lower sides in the width direction to prevent the upper and lower sides from curling in or out due to insufficient fixing force.
  • the width in the horizontal direction is larger than the width in the vertical direction, so that the curling phenomenon on the left and right sides can be suppressed at the same time. In this way, the fixing and stretching of the elastic tension member 4 to the screen panel can be ensured, and the number of the elastic tension members 4 is small, which is convenient to install.
  • the arrangement of the elastic tension members is applicable to both the area corresponding to the front light receiving area on the back of the screen panel 1, the upper edge region of the screen panel 1 and the lower edge region of the screen panel are covered with a connecting cloth.
  • the case may also be applied to a case where the connection cloth 2 covers the entire back surface of the screen panel 1.
  • the elastic tension members 4 are still provided around the screen panel 1, and the elastic tension members located on the left and right sides of the screen panel 1 are less dense than the elastic forces on the upper and lower sides of the screen panel. Setting density of the tension member.
  • the elastic tension members 4 still surround the periphery of the screen panel 1, but the elastic tension members on the upper and lower sides of the screen panel 4 are densely arranged, and the elastic tension members on the left and right sides are relatively sparse.
  • the stretching force is relatively large, which can effectively resist the stress of the screen panel 1 curling inward or outward; while the screen panel 1 naturally sags, the stress of vertical curl is very small, so the stretching effect on the left and right sides is set. Less force.
  • the elastic tension members 4 arranged in this way can still combine the stretching requirements of the screen panel 1 in different directions to apply appropriate stretching forces to each direction of the screen panel 1 to achieve a better stretching and fixing effect. The reduction in quantity also brings some convenience to the installation.
  • connection cloth 2 covers the entire back of the screen panel 1.
  • the connection cloth 2 covers the area corresponding to the front light receiving area on the back of the screen panel 1, the upper edge region of the screen panel 1, and the lower edge region of the screen panel 1. 2, so it is not easy to set the elastic tension member 4.
  • the elastic tension members 4 can also be arranged asymmetrically.
  • an elastic tension member 4 may be provided on one of the two sides, and the elastic tension member 4 may be used to connect between the connection cloth 2 and the screen frame 3, and the other side may only rely on the connection.
  • the cloth 2 is directly connected to the screen frame 3.
  • only the elastic tension member 4 is provided on one side, so that the opposite side of the elastic tension member 4 can also act on the tension of the elastic tension member 4
  • the bottom was stretched and straightened.
  • the opposite sides of the screen panel 1 may be the upper and lower sides, or the left and right sides.
  • the projection screen usually needs to be fixed on a vertical surface such as a wall.
  • the screen frame has a screen fixing groove for connecting with the wall support, and the screen fixing groove has a downward notch, so that the screen frame can be connected to the screen fixing groove through the screen fixing groove.
  • the screen fixing groove can be used for hooking or snapping.
  • the screen frame 3 further includes a screen fixing groove 32.
  • a hanger assembly 5 can be provided on the wall as a wall support; wherein the hanger assembly 5 includes a support 51, a support 51 has a mounting end 511 for inserting the screen fixing groove 32 and supporting the screen frame 3.
  • the support member 51 has a variable position in the vertical direction with respect to the wall. In this way, the screen frame 3 of the projection screen can be hung on the hanger assembly 5 to achieve relative fixation between the projection screen and the wall.
  • the fixed structure of the screen plate also serves as the wall-hanging structure of the entire projection screen, which can simplify the structure of the projection screen and help reduce the distance or thickness between the projection screen and the wall.
  • the hanger assembly 5 includes a support member 51 that can be moved in a vertical direction relative to the wall to change the height of the support member 51 relative to the ground. At this time, the screen frame 3 supported by the supporting member 51 can be adjusted in height accordingly.
  • FIG. 11 is a schematic structural diagram of a support member provided in Embodiment 1 of the present disclosure.
  • the supporting member 51 may be provided with a plurality of fixing holes 512 arranged at intervals in the vertical direction, so that a set bolt can be inserted into the fixing hole 512 (in the figure) (Not shown) to complete the fixing between the support 51 and the wall.
  • the positioning bolts are penetrated in different fixing holes 512, the support member 51 has different fixed heights relative to the wall, thereby realizing the height adjustment of the screen frame 3.
  • the body of the support member 51 may also have a variety of different shapes or structures.
  • the shape of the mounting end 511 of the support member 51 matches the shape of the screen fixing groove 31 of the screen frame 3.
  • the mounting end 511 of the support member 51 may be rectangular matching the shape of the screen fixing groove 31.
  • the rectangular mounting end 511 has a certain thickness, can be caught in the screen fixing groove 31, and reduces or eliminates the shaking of the mounting end 511 in the screen fixing groove 31, thereby ensuring that the screen frame 3 is effectively fixed.
  • the mounting end 511 of the supporting member 51 may have an arc-shaped sliding surface, as shown in FIG. 11.
  • the arc-shaped sliding surface of the mounting end 511 will not match the shape of the groove wall of the screen fixing groove 31, but will hold the point. Contact or line contact relationship.
  • a certain sliding can occur between the hanging end 511 of the support member 51 and the screen fixing groove 31 along the sliding surface, thereby maintaining a relatively flexible relative position.
  • the screen frame 3 receives external force, it can relatively easily move left or right or rotate to a certain extent relative to the support 51, thereby facilitating the adjustment of the position and angle of the projection screen on the wall.
  • the front of the screen panel 1 is also provided with a front decorative frame 6, a front decorative frame 6 and a screen frame for covering the edges of the connecting cloth. 3 connections.
  • the front decorative frame 6 can be set on the screen frame 3, and the connecting cloth 2 exposed on the outside of the edge of the screen board 1 is covered to prevent the connecting cloth 2 from being exposed, thereby effectively improving the frontal beauty of the projection screen.
  • the structure of the front decorative frame and the screen frame 3 are similar, and both have a rectangular frame structure.
  • the surface of the front decorative frame 6 may be treated by a surface treatment process such as electroplating, wire drawing, or painting to further improve its aesthetics.
  • the front decorative frame and the screen frame 3 may be connected by a connection method commonly used by those skilled in the art, such as clamping, bonding, or threaded fastener connection.
  • the screen frame 3 is usually made of aluminum-plastic material, and has certain hardness and strength.
  • the front decorative frame can also be made of aluminum-plastic material or rigid plastic.
  • connection diagrams of a front decorative frame and a screen frame in a projection screen provided in Embodiment 2 of the present disclosure are connection diagrams of a front decorative frame and a screen frame in a projection screen provided in Embodiment 2 of the present disclosure.
  • a first connection member 61 may be further provided at a corner of the front decorative frame 6 so that the front decoration
  • the corners of the frame 6 and the corners of the screen frame 3 can be connected through the first connecting member 61, so that the front decorative frame 6 and the screen frame 3 have a high connection strength, and the front decorative frame 6 and the The alignment of the splicing between the screen frames 3.
  • the number of the first connecting members 61 may be four, and the four first connecting members 61 are respectively disposed at four corners of the front decorative frame.
  • FIGS. 13 and 14 a second connecting member 62 may be further provided between the frame portion of the front decorative frame 6 and the corresponding portion of the screen frame 3.
  • FIG. 13 is a partial structural schematic diagram of the second connecting member 62 connecting the front decorative frame 6 and the screen frame 3
  • FIG. 14 is a schematic cross-sectional view of the front decorative frame 6 and the screen frame 3 after being connected.
  • the second connecting member 62 may be located in a middle region of a frame of the front decorative frame 6.
  • the second connecting member 62 can connect the front decorative frame 6 and the screen frame 3, and can provide connection and fixation for the frame part when the front decorative frame 6 has a longer frame, and can also effectively offset the front decorative frame 6 and the screen frame. The stress and torque generated by connecting only the three corners.
  • the shape of the second connecting member 62 is similar to an I-shape, but the upper surface is only provided as a portion that can be connected to the front decorative frame 6 and is fixed to the inside of the front decorative frame 6 by screws.
  • the lower surface is larger than the upper surface area.
  • the screen frame 3 is fixed.
  • the height of the second connecting member 62 is set to be slightly larger than the gap between the screen frame 3 and the front decorative frame 6, and the second connecting member 62 is a sheet metal piece, which has a high structural strength.
  • the front decorative frame 6 It is a structure that wraps the screen frame 3 back and forth. After being fixed in this way, the part of the front decorative frame 6 located on the back of the screen frame 3 will be subjected to outward pressing force.
  • neither the screen frame 3 nor the structures related to the front decorative frame 3 are fixedly installed, for example, the angle iron of the front decorative frame 6 is fixed on the side facing the optical film of the screen panel 1.
  • the first connection member 61 and the corner are installed on the back of the screen, and the reinforcing beams or ribs 33 are also fixed on the back. This helps to ensure the flatness of the screen frame 3 facing the optical film side of the screen panel 1 and reduce the turnover process. It is not easy to scratch the optical film of the screen plate 1. At the same time, when disassembling the screen in the future, only the back of the screen can be operated.
  • the projection screen includes a hard screen board, a soft connection cloth, a screen frame surrounding the periphery of the screen board, and a plurality of elastic tension members;
  • the front side of the screen board is The projection light receiving surface
  • the back of the screen board is bonded to the connecting cloth
  • the connecting cloth covers the area on the back of the screen board opposite to the front light receiving area
  • the edge of the connecting cloth is outside the edge of the screen board.
  • One end is connected to the edge of the connecting cloth, and the second end is connected to the screen frame, so that the connecting cloth and the screen plate are stretched to a flat state by the pulling force of the elastic pulling member.
  • a soft cloth and an elastic tension member can be used to fix and position the screen panel and the screen frame.
  • the screen panel can rely on the elasticity of the elastic tension member to be in a flat and stretched state without deformation, and the quality of the projection picture is high.
  • Embodiment 2 of the present disclosure also provides a projection system.
  • the projection system provided in this embodiment includes a projection device and the projection screen in the first embodiment, and the projection device is configured to project a projection image onto a screen panel of the projection screen.
  • the specific structure, working principle, and function of the projection screen have been described in detail in the first embodiment, and are not repeated here.
  • the projection device may be various types of existing projectors, such as a laser projector.
  • the projection device can project a projection image onto a screen panel of the projection screen, so that the screen panel can display the projection image for people to watch.
  • the screen plate in the projection screen can maintain the stretched state under the action of the pulling force of the elastic tension member, and the flatness is better, which can effectively ensure the picture quality of the projection on the screen plate.
  • the projection screen may include a hard screen board, a soft connecting cloth, a screen frame surrounding the periphery of the screen board, and a plurality of elastic tension members;
  • the front of the screen board is a projection
  • the light receiving surface, the back of the screen board is bonded to the connecting cloth, the connecting cloth covers the area on the back of the screen board opposite to the front light receiving area, and the edge of the connecting cloth is outside the edge of the screen board. Both ends are connected to the edge of the connecting cloth, and the second end is connected to the screen frame, so that the connecting cloth is stretched to a flat state by the pulling force of the elastic pulling member.
  • a region on the back of the screen panel of the projection screen corresponding to the front light receiving region, an upper edge region of the screen panel, and a lower edge region of the screen panel are covered with a connecting cloth.
  • the screen board has a good flatness in the up and down directions.
  • connection cloth can also cover the entire back of the screen panel. In this way, the entire screen panel can be stretched under the tension of the connecting cloth.
  • the screen frame includes an outer edge support portion, and the screen frame includes an outer edge support portion.
  • the outer edge support portion is supported on the back of the edge of the screen plate and protrudes beyond the screen plate.
  • the edge protrudes to the outside of the outer support portion and is bent backward to connect with the elastic tensile member after wrapping the edge of the outer support portion.
  • the first end of the elastic tension member may generally be located outside the second end along the extending direction of the screen panel. In this way, the elastic tension member can stretch the connecting cloth outward through the tension.
  • a plurality of the elastic tension members are disposed at intervals on the upper and lower sides of the screen panel; or a plurality of the elastic tension members are disposed at intervals around the screen panel; or a plurality of the elastic tension members are disposed at intervals It is disposed on one of the upper and lower sides of the screen panel.
  • the setting density of the elastic tension members on the left and right sides of the screen plate may be smaller than the setting density of the elastic tension members on the upper and lower sides of the screen plate. In order to reduce the number of elastic tension members, it is convenient to install the projection screen.
  • the outer support portion has a support portion that is parallel to the plane on which the screen panel is located.
  • the tension direction of the elastic tension member is at an angle of 45 degrees or less with the plane on which the screen panel is located.
  • At least one rigid bar member is connected to the edge of the connecting cloth for connecting with the elastic tensile member.
  • the projection screen further includes a front decorative frame, and the front decorative frame and the screen frame are provided with connecting members at corresponding corner positions.
  • the screen frame may further have a screen fixing groove for connecting with the wall support, and the screen fixing groove has a downward notch, so that the wall support can be inserted and fixed on the wall.
  • the screen frame has a hollow cross-section, and a reinforcing beam or a rib is disposed in an internal cavity of the screen frame. In this way, the screen frame can achieve lighter weight and higher structural strength.
  • the front of the screen panel is further provided with a front decorative frame for covering an edge of the connection cloth, and the front decorative frame is connected to the screen frame.
  • the projection system includes a projection device and a projection screen.
  • the projection device is configured to project a projection screen onto a screen panel of the projection screen.
  • the projection screen includes a hard screen panel, a soft connecting cloth, and a screen panel.
  • the screen frame on the periphery of the screen and multiple elastic tension members; the front side of the screen panel is the projection light receiving surface, the back side of the screen panel is bonded to the connection cloth, and the connection cloth covers the area on the back of the screen board opposite to the front light receiving area, and the connection cloth
  • the edge of the screen is outside the edge of the screen board.
  • each elastic tension member is connected to the edge of the connecting cloth, and the second end is connected to the screen frame, so that the connection cloth is stretched to a flat level by the tension of the elastic tension member. status.
  • a soft cloth and an elastic tension member can be used to fix and position the screen panel and the screen frame.
  • the screen panel can rely on the elasticity of the elastic tension member to be in a flat and stretched state without deformation, and the quality of the projection picture is high.

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Abstract

一种投影屏幕及投影系统，其中投影屏幕，包括硬质的屏幕板（1）、软质的连接布（2）、沿屏幕板（1）背面设置的屏幕框架（3）以及多个弹性拉力件（4）；屏幕板（1）的正面为投影受光面，屏幕板（1）的背面与连接布（2）粘合，连接布（2）覆盖屏幕板（1）背面，并伸出屏幕板（1）背面的至少一侧边缘之外；每个弹性拉力件（4）的第一端均与连接布（2）的一侧边缘连接，第二端与屏幕框架（3）连接，以通过弹性拉力件（4）的拉力将连接布（2）和屏幕板（1）拉伸至平整状态。这样能够在固定投影屏幕的屏幕板（1）的同时，使屏幕板（1）具有较好的平整度。

Description

投影屏幕及投影系统
相关申请交叉引用
本申请要求于2018年8月29日提交中国专利局、申请号为201810998499.8、发明名称为“投影屏幕及投影系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本公开涉及投影显示领域，尤其涉及一种投影屏幕及投影系统。
背景技术
随着科技的不断发展，投影式显示系统越来越多的应用于人们的工作和生活中。
激光投影因为其色域广，亮度高，寿命长等优点逐渐占据市场。目前，投影式显示系统的投影屏幕通常包括软幕和硬幕等不同种类。其中，硬幕因其具有良好的光学增益均匀性、色彩还原性和平整度，具有较好的显示效果。
发明内容
本公开提供一种投影屏幕及投影系统，能够对屏幕板进行固定，并使屏幕板保持较好的平整度。
第一方面，本公开提供一种投影屏幕，
包括硬质的屏幕板、软质的连接布、围设在屏幕板背面周侧的屏幕框架以及多个弹性拉力件；屏幕板的正面为投影受光面，屏幕板的背面与连接布粘合，连接布覆盖屏幕板背面，并伸出屏幕板背面的至少一侧边缘之外；每个弹性拉力件的第一端均与连接布的一侧边缘连接，第二端与屏幕框架连接，以通过弹性拉力件的拉力将连接布和屏幕板拉伸至平整状态；
第二方面，本公开提供一种投影系统，包括投影装置和如上所述的投影屏幕，投影装置用于向投影屏幕的屏幕板投射投影画面。
附图说明
为了更清楚地说明本公开实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1是相关技术中一种正投影光学屏幕的结构示意图；
图2是相关技术中背板式固定结构的结构示意图；
图3是本公开实施例一提供的投影屏幕的结构示意图；
图4是本公开实施例一提供的投影屏幕的爆炸示意图；
图5是本公开实施例一提供的投影屏幕的截面示意图；
图6是本公开实施例一提供的投影屏幕中屏幕框架的局部结构示意图；
图7是本公开实施例一提供的投影屏幕的背面结构示意图；
图8是本公开实施例一提供的又一种投影屏幕的背面结构示意图；
图9是本公开实施例二提供的一种投影屏幕中屏幕框架的局部结构示意图；
图10是本公开实施例二提供的一种投影屏幕的局部结构截面示意图；
图11是本公开实施例提供的一种支撑件的结构示意图；以及
图12-14是本公开实施例二提供的投影屏幕中一种前装饰框与屏幕框架的连接示意图。
附图标记：
1-屏幕板，2-软质连接布，3-屏幕框架，4-弹性拉力件，5-挂架组件，6-前装饰框，7-承载面，31-外沿支撑部，312-支撑部，313-凸筋，314-悬挂端，32-屏幕固定槽，33-加强梁或加强肋，51-支撑件，511-挂接端，512-固定孔，61-第一连接件，62-第二连接件。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
图1是相关技术中一种正投影光学屏幕的结构示意图。以一种正投影光学屏幕为例，硬幕通常包括如图1所示的光学结构层：着色层101，扩散层102，菲涅尔透镜层103和反射层104等。其中，着色层101位于投影屏幕的最外侧，投影影像光束最先入射，也最终通过该层出射，着色层的主要作用是为了提高投影屏幕的色彩还原能力，有时着色层101也可被基板层替代；基板层包括着色层和硬质膜层；硬质膜层主要起到保护作用；扩散层102主要用于不均匀的入射光进行匀化，并将出射光的角度进行扩大；菲涅尔透镜层103用于将入射的一定角度范围内的光束进行准直平行射出，并将反射层104反射的光束进行发散。反射层104通常为铝反射膜层，镀于菲涅尔透镜层103的外侧。
随着投影屏幕的尺寸不断增大(目前主流投影屏幕的尺寸通常在80寸以上)，为了对较为脆弱的硬幕进行固定，并保证投影屏幕的平整性，通常采用背板式固定结构对硬幕进行固定。图2是相关技术中背板式固定结构的结构示意图。如图2所示，在一些实施例中，背板式固定结构包括有装饰边框201和平板状的背部支撑板材204，将硬幕202与背部支撑板材204通过粘接剂203粘合固定，再将装饰边框201连接在背部支撑板材204上，从而完成对硬幕202的支撑固定，这样可以通过背部支撑板材204的刚性而维持硬幕202的平整度，避免硬幕202产生变形。
然而，采用整块背板式固定结构对硬幕进行固定，一方面，背部支撑板材的面积 较大，加工时，大尺寸的板材容易发生鼓包等变形现象，同时，光学屏幕通过胶粘到背板板材时不均匀的涂覆也会造成粘合的不平整性，从而影响整块硬幕的平整度，另一方面，这种背板式固定方式也使得整块屏幕的重量非常大，不便于运输和悬挂，对投影尺寸的大型化带来限制。亟待解决上述问题。
实施例一
图3是本公开实施例一提供的投影屏幕的正面结构示意图。图4是本公开实施例一提供的投影屏幕的爆炸示意图。图5是本公开实施例一提供的投影屏幕的截面示意图。图6是本公开实施例一提供的投影屏幕中屏幕框架的局部结构示意图。图7是本公开实施例一提供的投影屏幕的背面结构示意图。如图3-图4所示，本实施例提供的投影屏幕，包括硬质的屏幕板1、软质的连接布2、围设在屏幕板1的周侧的屏幕框架3以及多个弹性拉力件4；屏幕板1的正面为投影受光面，屏幕板1的背面与连接布2贴合连接，在一些实施例中为粘合连接，连接布2覆盖屏幕板1背面，且伸出屏幕板1背面的至少一侧边缘之外，每个弹性拉力件4的第一端均与连接布2的一侧边缘连接，第二端与屏幕框架3连接，以通过弹性拉力件4的拉力将连接布2和屏幕板1拉伸至平整状态。
其中，投影屏幕中的屏幕板1通常由硬质材料构成，如前所述，包括多层光学结构层，相对于软质屏幕来说，具有一定硬脆度和刚性。因而当屏幕板1被拉伸时，即能够形成较为平整的表面。这样，屏幕板1的正面的至少部分区域可以用于作为用于投影图像的受光区域，以便将画面和图像投射在屏幕板1正面进行显示。
由于构成屏幕板1的硬质材料通常具有硬脆性，如果直接在硬质的屏幕板1上打孔或开槽进行固定，容易造成屏幕板1开裂。为了连接和固定硬质的屏幕板1，本实施例中的投影屏幕还包括有软质的连接布2，连接布2可以粘接在硬质的屏幕板1上，并和其它固定结构实现连接，从而完成对屏幕板1的固定。此时，连接布2和屏幕板1之间相互粘接粘合，因而连接布2的伸展程度也会影响到屏幕板1的卷曲或展开。为了和屏幕板1之间实现连接，连接布2具有足够的大小，以至少覆盖屏幕板1背面的与正面受光区域相对的区域。此时，受光区域的背面均和连接布2粘合。这样当连接布2为平整的伸展状态时，屏幕板1上的用于投射图像的受光区域也会被拉伸，从而实现较好的画面显示质量。
由于屏幕板1在进行画面投影时，通常呈竖直吊挂设置，因而硬质的屏幕板1较易因自身重量而自然下垂，此时，屏幕板1主要会在左右两侧会产生向内卷曲或者向外张的现象。为了让屏幕板1保持平整，在一些实施例中，屏幕板1背面的与正面受光区域对应的区域、屏幕板的上边缘区域和屏幕板的下边缘区域均可以覆盖连接布2。此时，连接布2沿竖直方向横跨整个屏幕板1，从而可以使屏幕板1的上边缘区域和下边缘区域均得到连接布2的拉伸，由于屏幕板1通常在水平方向上的宽度大于竖直方向上的宽度，因而利用连接布2对屏幕板1上下两边进行加强固定，不仅可以避免上下两边发生向内卷曲或外张，也能同时抑制左右两侧的卷曲现象，从而使整个屏幕板1在各个方向上均具有较好的平整度。
而在另一种实施方式中，连接布2覆盖于整个屏幕板1的背面。这样整个硬质的屏幕板1均能够与软质的连接布2粘合，从而利用连接布的伸展而带动硬质的屏幕板 1实现拉伸和伸展，从而保持较好的平整性。
上述两种方式中，屏幕板1均可以贴在连接布2的中央位置，而连接布2的边缘会向屏幕板1的边缘外侧伸出，以便和其它结构进行连接。
此外，在实现连接布2和屏幕板1的粘合时，连接布2也可以在与屏幕板1的背面粘合后，先从屏幕板1的边缘弯折到屏幕板1的正面，再和屏幕板1的正面边缘部分粘接在一起，最后反向继续伸向屏幕板1的边缘外侧。
由于连接布2为软质材料构成，因而为了让连接布2保持伸展状态，投影屏幕中还包括有多个弹性拉力件4，弹性拉力件4自身具有弹性，因而当弹性拉力件4一端固定在连接布2的边缘，而另一端与围设在屏幕板1周侧的屏幕框架3连接时，可以凭借自身的弹性将连接布2撑开，迫使连接布2张开为平整的伸展状态。一般的，为了简化投影屏幕的整体结构，弹性拉力件4的弹力方向一般为拉力方向，即当弹性拉力件4连接在连接布2和屏幕框架3之间时，弹性拉力件4可以将连接布2向外侧的屏幕框架3拉伸，直至连接布2张开至伸展状态。
此时，由于连接布2和屏幕板1相互粘接并粘合在一起，因而当连接布2向外伸展时，也会对屏幕板1形成向外拉伸，直至屏幕板1伸展至平整的状态。此时，屏幕板1可以保证较好的平整性，使投影在屏幕板1正面的画面和图像具有较佳的显示效果，避免投影画面出现歪斜和形变。
这样，本实施例中的投影屏幕，能够通过连接布2、弹性拉力件4以及屏幕框架3对屏幕板1进行固定，同时通过外侧的弹性拉力件4的拉伸作用，能够让连接布2呈拉伸状态，进而通过力的传递对屏幕板1也施加拉伸力，使得硬质屏幕板1也呈现拉伸展开的状态，利于硬质的屏幕板1实现平整性。
以下对本实施例中投影屏幕的具体结构和工作原理进行进一步详细说明。
在一些实施例中，硬质的屏幕板1通常可以由硬质层、菲涅尔结构层以及投射层等组成，具有一定的强度和刚度，而且在竖直的自由下垂状态下能够具有一定垂直度使得屏幕板看起来平整，但由于仍具有一定的软度，如无支撑或者受到外力干扰，硬质的屏幕板仍无法达到显示所需的平整度要求，屏幕不平整，就会使得激光投影画面显示时变形、模糊，亮度不均，或者其他劣化问题。
而为了对硬质的屏幕板1实现固定，使用连接布2作为连接结构，连接布2一般具有无弹性、超薄、致密和高强度等特性，这样连接布2和屏幕板1粘合时，能够让两者之间形成一体式结构，从而便于实现力的传递，使屏幕板1能够跟随连接布2的形变而产生拉伸。在一些实施例中，连接布2一般可以为软布。这样连接布2能够在被拉伸时较好的传递作用力，且性质较为稳定，能够适应较为广泛的环境，例如在-10℃至40℃的环境温度之间均能保持较好的平整度和可靠性。
在一些实施例中，连接布2的颜色一般可以为黑色，这样连接布2可以遮盖住屏幕板1背面的与受光区域相对的区域，起到遮光和保护屏幕板1的作用。这是因为硬质的屏幕板1为光学结构层，具有一定的透光率，尤其作为正投屏幕时，最里面一层为反射层，反射层的作用面是对投射光进行反射(比如为镀铝膜)，但由于无法做到100％的反射率，所有会有部分光透过，这样会造成图像对比度的下降。因此，在屏 幕板1的背面，在一些实施例中，为铝膜的背面，利用黑色的连接布进行遮光，有利于光线不泄露，同时还能防止屏幕背面划伤等，对铝膜和各光学结构层起到保护作用。
在一些实施例中，在连接屏幕板1与连接布2时，通常采取粘合剂，也就是胶粘的方式实现两者之间的连接和固定。这样通过胶粘方式让屏幕板1的背面与连接布2粘合在一起，屏幕板1的背面和连接布2之间不会留有空间和间隙，因而不会因为两者间隙内的空气流动(尤其是温度变化时带来气流流动)而影响投影画面的显示。
一般的，用于连接屏幕板1和连接布2的粘合剂，其通常具有和屏幕板1相近或相同的热膨胀系数，或者是具有一定的延展性，这样屏幕板1因温度变化而产生热胀冷缩时，粘合剂会起到一定的缓冲作用，减小屏幕板1因热胀冷缩变形而对投影画面造成的影响，也有利于维持硬质屏幕板1的平整度，防止因为两者膨胀系数不同，伸缩率不同，使得屏幕板1产生应力，而影响平整度。
为了提高和屏幕板1之间的粘接效果，连接布2的与连接板1粘合的一面通常具有聚氨酯(polyurethane，PU)涂层，这样能够增加连接布2的表面能，从而提高连接布2与粘合剂之间的粘合力。在一些实施例中，因为连接布2通常为涤纶布料制成，所以聚氨酯涂层可以喷涂在连接布2上，以和连接布2的表面实现较好的附着性。
为了连接和定位连接布2以及屏幕板1，屏幕框架3一般为框架式结构，且屏幕框架3围成一个矩形或者正方形的中空区域，该中空区域可以用于安放屏幕板1，而屏幕框架3可以围绕在屏幕板1的边缘之外，为屏幕板1提供保护，而屏幕框架3和连接布2之间通过可形变或位移的连接件或连接结构，例如是弹性拉力件4实现连接，屏幕框架3的具体结构以及连接关系如图3至图7所示，其中为便于叙述，以屏幕板1上侧和下侧的屏幕框架为例进行说明。可以理解的是，屏幕框架3的左右两侧的结构也可以选择设置和上下两侧相似的结构和连接关系，此处不再赘述。
此外，由于连接布2通常由较为柔软的材料制成，在一些实施例中，连接布2的边缘可以具有加强结构，以和弹性拉力件4或者屏幕框架3进行连接时，避免连接布2边缘产生撕扯变形。在一些实施例中，加强结构可以为铆接在连接布2上的加固圈，或者是在连接布2的边缘部分的加厚布料等。一般的，加厚布料可以通过缝制等手段连接在连接布2上。
在一些实施例中，用于连接屏幕框架3与连接布2的连接件或连接结构可以为多种结构和类型，例如可以是弹簧或者弹性橡胶件，弹性硅胶件等利用自身的形变进行弹性连接的连接件，或者是磁性吸附件等。其中，弹簧或者弹性橡胶等弹性拉力件可以利用自身的弹性形变而产生用于连接屏幕框架3和连接布2的拉力，而磁性吸附件等可以依靠磁性件之间的相互吸附而产生用于连接屏幕框架3与连接布2的拉力。
在一些实施例中，如图5至图7所示，而在利用弹性拉力件4实现连接布2和屏幕框架3之间的连接时，连接布2、弹性拉力件4和屏幕框架3之间可以有多种不同的结构以及相对位置。作为其中一种实施方式，屏幕框架3的大小可以大于连接布2的大小，因而屏幕框架3位于连接布2的边缘外侧。此时，弹性拉力件4的一端即可连接在连接布2的边缘，而弹性拉力件4的另一端从连接布2的边缘向外伸出，并固 定在位于连接布2外侧的屏幕框架3上，这样即可依靠弹性拉力件4将连接布2固定在屏幕框架3的中央，并依靠弹性拉力件4的弹力对连接布2进行拉伸，让连接布2保持平整的伸展状态。通常，连接布的在长度或宽度方向或者四周方向上均大于屏幕框架的尺寸，这样便于连接布的边缘伸出，并包裹屏幕框架的外沿且被挂接到弹性拉力件上。
而由于将屏幕框架3设置在连接布2的边缘外侧，而弹性拉力件4位于连接布2边缘的外侧的连接方式，在连接布2外侧会包括弹性拉力件4以及屏幕框架3，因而投影屏幕的屏幕板1外侧会具有较宽的边框区域。为了减小屏幕板1外侧的边框区域的大小，弹性拉力件4可以设置其它位置，以减小弹性拉力件4和屏幕框架3在投影屏幕的屏幕板1正面的面积大小。
作为另一种实施方式，屏幕框架3可以包括外沿支撑部31，外沿支撑部31支撑在屏幕板1的边缘的背面，并突出于屏幕板1之外，连接布2的边缘伸出至外沿支撑部31的外侧后反向弯折，以在包裹外沿支撑部31的外侧边缘后与弹性拉力件4连接。
其中，由于连接布2和屏幕板1的背面粘合，因而外沿支撑部31会和连接布2的背离屏幕板1的一面粘合，并抵接支撑在屏幕板1的边缘背面。由于屏幕框架3一般为硬质结构，所以外沿支撑部31可以通过软质的连接布2而对屏幕板1的背面实现良好的接触支撑。同时，外沿支撑部31位于屏幕框架3的外沿，也就是屏幕框架3的最外侧区域。连接布2和屏幕板1粘合后，连接布2的边缘位于屏幕板1的边缘之外，并可继续向外伸出，并从外沿支撑部31的外侧绕到屏幕框架3的后方区域，将外沿支撑部31的边缘包裹起来，再与弹性拉力件4之间进行连接。这样，连接布2等效于吊挂在外沿支撑部31的边缘上，而外沿支撑部31的边缘则可作为支承点对连接布2进行支撑。此时，外沿支撑部31的边缘可以等效为一个定滑轮，使外沿支撑部31边缘两侧的连接布2依靠外沿支撑部31的支撑而向两个不同的方向运动，当弹性拉力件4对外沿支撑部31边缘背面的连接布2施加方向为远离外沿支撑部31边缘的拉力时，位于外沿支撑部31边缘正面的连接布2就会被反向拉动，并向靠近外沿支撑部31边缘的方向移动，从而得到了拉伸和伸展。
由于外沿支撑部31能够改变连接布2所受到的作用力方向，因而弹性拉力件4的设置位置不再局限于连接布2的边缘外侧，而是可以设置在连接布2伸展时的覆盖范围之内。在一些实施例中，弹性拉力件4的第一端，也就是与连接布2的边缘连接的一端可以位于弹性拉力件4的第二端的外侧。此时，弹性拉力件4可以隐藏在屏幕板1的背面方向，这样弹性拉力件4会被前方的屏幕板1和连接布2所遮蔽，从投影屏幕的正面难以看到。这样的设置方式，屏幕板1边缘外侧的区域不再具有弹性拉力件4，而仅仅只包括连接布2以及屏幕框架3，所以形成的边框区域具有较小的宽度，可以有效提升投影屏幕的外观显示效果。
此外，屏幕框架3为中空框架，其截面可以为中空形状，例如是中空矩形等，且由于屏幕框架3的截面中空，如图8所示，因而截面的内部空腔中可以设置有加强梁或者加强肋，以提高屏幕框架3的整体结构强度。
此外，在一些实施例中，由于屏幕板1通常由硬质材料构成，在外界环境温度变化时会产生热胀冷缩现象。而当屏幕板1发生热胀冷缩时，如果屏幕板1的边缘超过了屏幕框架3的外缘，则可能会产生磕碰等现象。为了保证投影的画面质量，外沿支撑部31的边缘通常位于屏幕板1的边缘之外。此时屏幕框架3能够在外界环境改变时，为屏幕板1提供足够的定位和保护。
在上述连接布2的边缘的连接方式中，可以让弹性拉力件4的拉力方向与屏幕板1所在的平面保持平行或者接近平行的角度。这样可以带来两方面好处：一方面可以减小投影屏幕的整体体积和厚度，当弹性拉力件4在产生弹性形变时，弹性形变的方向位于屏幕板所在的平面内，或者与该平面具有较小的夹角，因而在投影屏幕的厚度方向上的形变量较小，能够有效减小投影屏幕的厚度；另一方面，当弹性拉力件4的拉力方向和屏幕板1所在的平面平行时，也容易使得屏幕板1沿着自身所在的平面拉伸延展。
在一些实施例中，弹性拉力件4的拉力方向与屏幕板1所在的平面呈小于等于45度的夹角，即软质连接布2从外沿支撑部31的外侧边缘翻折后，会沿着外沿支撑部背面一定的坡度向下被弹性拉力件4拉紧，这样弹性拉力件4的拉力方向就与屏幕板1所在的平面成一定的锐角夹角。由于前述定滑轮的作用原理，借助连接布2力的传递，屏幕板1始终受到沿屏幕板1所在平面向外延伸的拉力，容易使屏幕板1保持平整。
实施例二
如图8-13所示，本实施例二提供了又一种投影屏幕结构。
图10是本公开实施例二提供的一种投影屏幕结构的截面示意图，图9是本公开实施例二提供的一种投影屏幕结构局部截面示意图。如图9所示，屏幕框架3中，外沿支撑部31具有和屏幕板1所在平面相互平行的支撑部312，为了加强强度，支撑部312上可以设置有多个间隔排布的凸筋313，比如面向屏幕板1的一侧设置凸筋313均向屏幕板1凸出，且凸筋313的高度均相等，这样多个凸筋313的顶部可以共同支撑在屏幕板1的背侧，一方面对支撑部312进行结构加固，另一方面对屏幕板1形成支撑点。由于支撑部312与屏幕板1所在的平面相互平行，且凸筋313的高度均保持一致，因而支撑部312和凸筋313可以对屏幕板1形成良好的平面支撑。以及，支撑部312下部还可以形成向内的凸筋313，则支撑部312面向与屏幕板1的侧则可以设置为平面，这样可以保持较大面积的接触。屏幕框架3通过设置与屏幕板1相互平行的支撑面，两者接触面积增加，且接触位置基本都在一个平面上，粘合度提高，使屏幕板1利于具有良好的平整度。并且，在保证对屏幕板有效支撑的前提下，也利于实现整个屏幕板后面整体厚度的减小。
而在实现弹性拉力件4与屏幕框架3或者连接布2之间的连接时，根据弹性拉力件4的类型以及结构的不同，弹性拉力件4和连接布2之间，以及弹性拉力件4和屏幕框架3之间也会具有多种不同的连接方式。其中，因为屏幕框架3为刚体，所以可以采用卡接、螺纹紧固件连接或者铆接等常用的固定方式与弹性拉力件4连接在一起。而由于连接布2为较为柔软的材质所构成，不便于和弹性拉力件4直接连接，因 而通常还需要在连接布2上固定刚性的连接结构，并利用该连接结构将连接布2和弹性拉力件4连接在一起。
作为一种连接方式，连接布2的边缘设置有至少一个用于和弹性拉力件4连接的刚性棒材件21。为了让连接布2和刚性棒材件21连接，连接布2的边缘可以围成闭合形状，这样刚性棒材件21即可被固定在该闭合形状的内部，由此实现了刚性棒材件21和连接布2之间的固定。刚性棒材件21可以为多种不同的形状和结构，例如可以为直杆状结构等。而相应的，连接布2的边缘可以向内卷曲，并与连接布2的内侧缝纫在一起，这样连接布2的边缘部位就可形成闭合孔，以供直杆状的刚性棒材件21穿设在其中。这样当刚性棒材件21在弹性拉力件的拉力下移动时，连接布2也会随之移动，并被拉伸为平整的伸展状态。此外，刚性棒材件21也可以直接被缝合在连接布2的边缘。因为连接布2可以通过刚性棒材件21与弹性拉力件4实现连接，因而可以依靠刚性棒材件承载作用力，能够使连接布2的边缘不易发生撕裂或损坏，并且相比于直接挂接在连接布，比如孔洞或环上，由于弹性拉力件的数量为有限个，通过刚性棒材件能够对有限个弹性拉力件的拉伸力在整个刚性棒材件由施力点向其所在方向上进行匀化，这样拉伸力能够均匀的施加到连接布上，从而连接布对于硬质屏幕板的拉伸力在各处也都是均匀的，更加有利于实现一致的平整性。
在一些实施例中，为了连接刚性棒材件21，弹性拉力件4一般可以为拉向弹簧，拉向弹簧的一端可以以吊挂等形式连接在刚性棒材件21上，而拉向弹簧的另一端固定在屏幕框架3上。在一些实施例中，拉向弹簧的与刚性棒材件21连接的一端可以为吊钩或者吊环状，以便和刚性棒材件21吊挂连接。此外，弹性拉力件4还可以为橡胶体等本领域技术人员常用的弹性连接结构，此处不再赘述。
而为了和弹性拉力件4连接，外沿支撑部31的远离屏幕板1的一侧还设置有连接结构。在一些实施例中，如图9所示，当弹性拉力件4为拉向弹簧时，外沿支撑部31的远离屏幕板1的一侧设置有悬挂端314，悬挂端314的端部尺寸大于悬挂端314根部的尺寸，弹簧下端的钩子开口稍大于悬挂端314的根部但小于其端部，因此，当弹簧的下端钩子从悬挂端314的一头穿设进来后，由于悬挂端314的端部较大，弹簧的钩子就被挂在该端部，悬挂端314的较大的端部即可对拉向弹簧进行阻挡和限位，使拉向弹簧固定在悬挂端314上而不脱落。其中，为了便于和拉向弹簧连接，悬挂端314的端部的截面形状通常呈圆形，或水滴形。
此时，为了便于固定在悬挂端314上，弹性拉力件4也可以具有对应的形状。例如，弹性拉力件4为拉向弹簧，且至少一端为呈近似于吊环状的圆弧，这样悬挂端314可钩挂在弹性拉力件4的呈吊环状的圆弧之中，不易从该圆弧中松脱，因而连接较为可靠。并且还可以防止工人在拉伸弹簧挂接时，如果脱落则弹簧发生弹射，会造成对工人的伤害，这样可以实现
在一些实施例中，每个刚性棒材件21可以与多个弹性拉力件4对应连接。例如刚性棒材件21为直杆时，每个直杆上可以连接多个弹性拉力件，且多个弹性拉力件间隔分布在直杆上的不同杆段，这样可以有效简化投影屏幕的整体结构。
此外，刚性棒材件21也可以与弹性拉力件4一一对应连接，该种连接方式通常适用于刚性棒材件21为闭合环等外形尺寸较小的结构。
弹性拉力件4在为屏幕板1进行固定和拉伸时，需要有足够的拉伸强度，以保证屏幕板1得到有效的固定，并具有较好的平整度。弹性拉力件4本身需选用具有自适应环境冷热变化的弹性材料，并且能够根据环境温度或力的变化进行适应改变，以弹性拉力件4为弹簧为例进行说明，当屏幕板1为80英寸大小时，屏幕板1重量通常为5公斤(连接布2的重量较轻，可以省略)，这样即可设计弹簧的有效圈数为6圈，自由高度为23mm左右；而当弹簧对屏幕板1进行固定时，弹簧会拉伸至30mm，即伸长量为7mm。
由于屏幕板1的面积较大，所以通常需要多个弹性拉力件4共同拉伸，才能让屏幕板1和连接布2有效的展开成平整状态。弹性拉力件4之间可间隔设置，且具有合适的排布密度。这样一方面可以利用多个弹性拉力件4对屏幕板1提供足够的间接的拉伸力，另一方面，弹性拉力件4具有合适的数量，也能避免弹性拉力件4数量过大时造成安装困难。一般的，相邻弹性拉力件之间的间距在134mm左右时，即可在实现对屏幕板1固定的同时，保证屏幕板1具有足够的平整度。
其中，作为弹性拉力件4的一种排布方式，多个弹性拉力件4可以间隔设置在屏幕板1的四周，比如分别对称方向等间隔设置。这样屏幕板1的上下左右四个方向均会受到弹性拉力件4的拉力作用，因而屏幕板1在各个方向上均能够得到有效拉伸，保持平整状态。
而由于屏幕板1自身为硬质屏幕板，因而在竖直吊挂设置时，较易因自身重量原因而发生自然下垂，而屏幕板1左右两侧会向内卷曲或者向外张的现象。因而作为另一种排布方式，也可以让多个弹性拉力件4间隔设置在屏幕板1的上下两侧，这样在整个屏幕宽度方向，硬质的屏幕板1都会受到上下的拉伸力，相当于对屏幕的上下两边的方向进行了加强固定，将上下两边固定在了宽度方向上，防止上下两边因为受到的固定力不足而发生向内卷曲或向外张，且由于屏幕板1通常在水平方向上的宽度大于竖直方向上的宽度，因而这样也能同时抑制左右两侧的卷曲现象。这样能够保证弹性拉力件4对屏幕板的固定和拉伸，且弹性拉力件4数量较少，安装较为方便。
需要说明的是，上述弹性拉力件的排布方式，既适用于屏幕板1背面的与正面受光区域对应的区域、屏幕板1的上边缘区域和屏幕板的下边缘区域均覆盖有连接布的情况，也可以适用于连接布2覆盖于整个屏幕板1背面的情况。
此外，作为又一种排布方式，屏幕板1的四周仍然均设置有弹性拉力件4，而位于屏幕板1的左右两侧的弹性拉力件的设置密度小于位于屏幕板的上下两侧的弹性拉力件的设置密度。这样弹性拉力件4仍然环绕在屏幕板1的四周，但屏幕板4上下两侧的弹性拉力件设置较为密集，而左右两侧弹性拉力件设置较为稀疏，因而屏幕板1上下两侧受到的拉伸作用力较大，能够有效对抗屏幕板1向内卷曲或者向外张的应力；而屏幕板1因自然下垂，发生竖直方向卷曲的应力非常小，因此设置左右两侧受到的拉伸作用力较小。这样排布设置的弹性拉力件4仍能够结合屏幕板1不同方向的拉伸需求对屏幕板1的各个方向均施加适当的拉伸力，达到较好的拉伸和固定效果，由于弹性拉力件数量的减少，也给安装带来一定便利。
此时，由于屏幕板1的上下两侧和左右两侧均设置有弹性拉力件4，因而该种弹性拉力件的排布方式主要适用于连接布2覆盖于整个屏幕板1背面的情形。而连接布 2覆盖在屏幕板1背面的与正面受光区域对应的区域、屏幕板1的上边缘区域和屏幕板1的下边缘区域的方式，因屏幕板1左右两侧边缘位置未覆盖连接布2，所以不易设置弹性拉力件4。
此外，弹性拉力件4也可以呈不对称排布。例如，在屏幕板1的相对两侧，可以在其中一侧设置有弹性拉力件4，并利用弹性拉力件4连接在连接布2和屏幕框架3之间，而其中另一侧则只依靠连接布2直接和屏幕框架3连接。这样由于弹性拉力件4的拉力方向与该相对两侧之间的连线平行，所以仅在一侧设置弹性拉力件4，即可让相对设置的另一侧也在弹性拉力件4的拉力作用下被伸展拉直。其中，屏幕板1的相对两侧，可以是上下两侧，也可以为左右两侧。
为了便于观看，投影屏幕通常需要固定在墙壁等竖直面上。作为一种实施方式，为了实现投影屏幕的固定，屏幕框架具有用于和墙体支撑件连接的屏幕固定槽，屏幕固定槽具有向下的槽口，这样屏幕框架即可通过屏幕固定槽连接在墙体支撑件或者其它固定结构上，可以利用屏幕固定槽进行挂接或者卡接等。如图9所示，屏幕框架3还包括屏幕固定槽32。
如图9-11所示，由于屏幕框架3具有屏幕固定槽32，所以可以通过在墙壁上设置挂架组件5，以作为墙体支撑件；其中，挂架组件5包括支撑件51，支撑件51具有用于插入屏幕固定槽32并支撑屏幕框架3的挂接端511，支撑件51相对墙壁在竖直方向上具有可变的位置。这样投影屏幕的屏幕框架3可以挂接在挂架组件5上，以实现投影屏幕和墙壁之间的相对固定。
从而对于投影屏幕来说，屏幕板的固定结构也同时作为整个投影屏幕的挂墙结构，可以简化投影屏幕结构，有利于减小投影屏幕板与墙体之间的距离或厚度，同时，避免当硬质的屏幕板实现平整固定后，由于其他连接结构的加工或者安装的误差，影响已平整固定的屏幕板的状态。
在一些实施例中，挂架组件5中包括有支撑件51，支撑件51可以相对于墙壁在竖直方向上移动，以改变支撑件51相对于地面的高度。此时，被支撑件51所支撑的屏幕框架3就可以随之进行高度调整。
其中，根据挂架组件5的不同结构，支撑件51也可以具有多种不同的位置调节方式。图11是本公开实施例一提供的一种支撑件的结构示意图。如图12所示，在其中一种实施方式中，支撑件51上可以设置有多个沿竖直方向间隔排列的固定孔512，这样可以通过在固定孔512中穿设定位螺栓(图中未示出)，来完成支撑件51和墙壁之间的固定。当定位螺栓穿设在不同的固定孔512中时，支撑件51相对于墙壁就会存在不同的固定高度，从而实现屏幕框架3的高度调整。
为了支撑和挂接屏幕框架3，支撑件51的本体也可以具有多种不同的形状或结构。例如，可选的，支撑件51的挂接端511的形状与屏幕框架3的屏幕固定槽31的形状相匹配。此时，由于屏幕固定槽31一般为矩形，所以支撑件51的挂接端511可以为与屏幕固定槽31的形状相匹配的矩形。矩形的挂接端511具有一定的厚度，能够卡在屏幕固定槽31内，并减少或者消除挂接端511在屏幕固定槽31中的晃动，保证屏幕框架3得到有效固定。
而作为另一种实施方式，支撑件51的挂接端511可以具有圆弧状滑动面，如图 11所示。此时，圆弧状的挂接端511伸入屏幕框架3的屏幕固定槽31之后，挂接端511的圆弧状滑动面不会和屏幕固定槽31的槽壁形状吻合，而是保持点接触或者线接触关系。此时，支撑件51的挂接端511和屏幕固定槽31之间能够沿着滑动面产生一定的滑动，从而保持较为灵活的相对位置。这样屏幕框架3在受到外力时，可以较为容易的相对于支撑件51进行左右移动或一定的旋转，从而便于对投影屏幕在墙壁上的位置和角度进行调整。
此外，为了提升投影屏幕的外观美观度，如图10，图12，图13所示，屏幕板1的正面还设置有用于遮盖连接布的边缘的前装饰框6，前装饰框6和屏幕框架3连接。这样前装饰框6可以设置在屏幕框架3上，并将裸露在屏幕板1边缘外侧的连接布2遮盖起来，避免连接布2外露，以有效提升投影屏幕的正面美观度。一般的，前装饰框和屏幕框架3的结构类似，均为矩形框架结构。
在一些实施例中，前装饰框6的表面可以采用电镀、拉丝或者喷漆等表面处理工艺进行处理，以进一步提升其美观性。
在一些实施例中，前装饰框与屏幕框架3之间可以采用卡接、粘接或者螺纹紧固件连接等本领域技术人员常用的连接方式。
屏幕框架3通常采用铝塑材料，具有一定的硬度和强度。前装饰框也可以选用铝塑材料或者硬质塑料。
图12-14是本公开实施例二提供的投影屏幕中一种前装饰框与屏幕框架的连接示意图。如图12所示，而为了提高前装饰框6与屏幕框架3之间的连接强度，在一些实施例中，在前装饰框6的角部还可以设置有第一连接件61，这样前装饰框6的角部与屏幕框架3的角部之间能够通过第一连接件61实现连接，让前装饰框6与屏幕框架3之间具有较高的连接强度，并能够提高前装饰框6与屏幕框架3之间的拼接对准度。在一些实施例中，第一连接件61的个数可以为四个，且四个第一连接件61分别设置在前装饰框的四个角部。
此外，在一些实施例中，如图13，14所示，在前装饰框6的边框部位以及屏幕框架3的对应部位之间还可以设置有第二连接件62。其中，图13是第二连接件62连接前装饰框6和屏幕框架3的局部结构示意图，图14是前装饰框6和屏幕框架3连接后的截面示意图。
在一些实施例中，第二连接件62可以位于前装饰框6的边框的中部区域。第二连接件62可以连接前装饰框6与屏幕框架3之间，能够在前装饰框6的边框较长时，为边框部位提供连接和固定，同时也能够有效抵消前装饰框6和屏幕框架3之间仅在角部进行连接而产生的应力和扭矩。
第二连接件62的形状类似工字型，但上表面仅设置为能够与前装饰框6相连接的部分，并通过螺钉与前装饰框6内侧固定，下表面大于上表面面积，下表面与屏幕框架3相固定。
进一步地，将第二连接件62的高度设置为稍大于屏幕框架3和前装饰框6之间的间隙，且第二连接件62为钣金件，具有较高的结构强度，前装饰框6是前后包裹住屏幕框架3的结构方式，这样固定后，前装饰框6位于屏幕框架3背面的部分会受到向外的挤压力，这样可以使得前装饰框6位于屏幕框架3正面的部分发生内扣的倾 向，即，前装饰框6位于屏幕框架3正面的部分会对屏幕板1产生向屏幕板1背面的推力，这样使得屏幕板1和屏幕框架3的贴合更为紧密。
以及，在上述实施例中，无论是屏幕框架3，还是前装饰框3有关的结构的固定安装，均不在朝向屏幕板1光学膜片的一侧进行，比如，固定前装饰框6的角铁和角部第一连接件61在屏幕背面完成安装，加强梁或加强肋33也在背面完成固定安装，这样利于保证屏幕框架3面向屏幕板1光学膜片侧的平整度，减少翻转工序，还不易划伤屏幕板1的光学膜片。同时，在后续拆卸屏幕时，仅在屏幕的背面操作即可。
综上在一个或多个本实施例中，投影屏幕包括硬质的屏幕板、软质的连接布、围设在屏幕板的周侧的屏幕框架以及多个弹性拉力件；屏幕板的正面为投影受光面，屏幕板的背面与连接布粘合，连接布覆盖屏幕板背面的与正面受光区域相对的区域，且连接布的边缘位于屏幕板的边缘范围之外，每个弹性拉力件的第一端均与连接布的边缘连接，第二端与屏幕框架连接，以通过弹性拉力件的拉力将连接布和屏幕板拉伸至平整状态。这样可以利用软布和弹性拉力件实现屏幕板与屏幕框架之间的固定和定位，同时屏幕板能够依靠弹性拉力件的弹性处于平整的伸展状态而不产生变形，投影画面质量较高。
实施例三
本公开实施例二还提供一种投影系统。本实施例提供的投影系统，包括投影装置和前述实施例一中的投影屏幕，投影装置用于向投影屏幕的屏幕板投射投影画面。其中，投影屏幕的具体结构、工作原理和作用均已在前述实施例一中进行了详细说明，此处不再赘述。
在一些实施例中，本实施例的投影系统中，投影装置可以为现有的各类投影仪，例如激光投影仪等。投影装置可以向投影屏幕的屏幕板投射出投影画面，这样屏幕板即可显示出投影画面，以供人们观看。其中，投影屏幕中的屏幕板可在弹性拉力件的拉力作用下维持伸展状态，平整度较好，能够有效保证投影在屏幕板上的画面质量。
其中，本实施例的投影系统中，投影屏幕可以包括硬质的屏幕板、软质的连接布、围设在屏幕板的周侧的屏幕框架以及多个弹性拉力件；屏幕板的正面为投影受光面，屏幕板的背面与连接布粘合，连接布覆盖屏幕板背面的与正面受光区域相对的区域，且连接布的边缘位于屏幕板的边缘范围之外，每个弹性拉力件的第一端均与连接布的边缘连接，第二端与屏幕框架连接，以通过弹性拉力件的拉力将连接布拉伸至平整状态。
在一些实施例中，在投影系统中，投影屏幕的屏幕板背面的与正面受光区域对应的区域、屏幕板的上边缘区域和屏幕板的下边缘区域均覆盖有连接布。这样屏幕板在上下方向上均具有较好的平整度。
在一些实施例中，连接布也可以覆盖于整个屏幕板的背面。这样整个屏幕板均能够在连接布的拉伸下伸展。
在一些实施例中，屏幕框架包括外沿支撑部，屏幕框架包括外沿支撑部，外沿支撑部支撑在所述屏幕板的边缘的背面，并突出于所述屏幕板之外，连接布的边缘伸出 至外沿支撑部的外侧后反向弯折，以在包裹外沿支撑部的边缘后与弹性拉力件连接。
进一步的，弹性拉力件的第一端一般可以位于第二端的沿屏幕板延伸方向的外侧。这样弹性拉力件可以通过拉力让连接布向外拉伸。
以及，多个所述弹性拉力件间隔设置在所述屏幕板的上下两侧；或者，多个所述弹性拉力件间隔设置在所述屏幕板的四周；或者，多个所述弹性拉力件间隔设置在所述屏幕板的上下两侧中的一侧。
在一些实施例中，当屏幕板的四周均设置有弹性拉力件时，位于屏幕板的左右两侧的弹性拉力件的设置密度可以小于位于屏幕板的上下两侧的弹性拉力件的设置密度，以减小弹性拉力件的数量，便于进行投影屏幕的安装。
优选地，外沿支撑部具有和所述屏幕板所在平面相互平行的支撑部。
进一步地，弹性拉力件的拉力方向与所述屏幕板所在的平面呈小于等于45度的夹角。
优选地，连接布的边缘穿设有至少一个用于和所述弹性拉力件连接的刚性棒材件。
优选地，投影屏幕还包括前装饰框，所述前装饰框和所述屏幕框架在相对应的角部位置设置有连接件。
在一些实施例中，屏幕框架还可以具有用于和墙体支撑件连接的屏幕固定槽，屏幕固定槽具有向下的槽口，从而可以插入墙体支撑件，并固定在墙面上。
在一些实施例中，屏幕框架的截面为中空形状，且屏幕框架的内部空腔中设置有加强梁或者加强肋。这样屏幕框架可以实现较轻的重量和较高的结构强度。
在一些实施例中，屏幕板的正面还设置有用于遮盖连接布的边缘的前装饰框，前装饰框和屏幕框架连接。
本实施例中，投影系统包括投影装置和投影屏幕，投影装置用于向投影屏幕的屏幕板投射投影画面；其中，投影屏幕包括硬质的屏幕板、软质的连接布、围设在屏幕板的周侧的屏幕框架以及多个弹性拉力件；屏幕板的正面为投影受光面，屏幕板的背面与连接布粘合，连接布覆盖屏幕板背面的与正面受光区域相对的区域，且连接布的边缘位于屏幕板的边缘范围之外，每个弹性拉力件的第一端均与连接布的边缘连接，第二端与屏幕框架连接，以通过弹性拉力件的拉力将连接布拉伸至平整状态。这样可以利用软布和弹性拉力件实现屏幕板与屏幕框架之间的固定和定位，同时屏幕板能够依靠弹性拉力件的弹性处于平整的伸展状态而不产生变形，投影画面质量较高。
最后应说明的是：以上各实施例仅用以说明本公开的技术方案，而非对其限制；尽管参照前述各实施例对本公开进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本公开各实施例技术方案的范围。

Claims (12)

  1. 一种投影屏幕，其特征在于，包括硬质的屏幕板、软质的连接布、围设在所述屏幕板背面周侧的屏幕框架以及多个弹性拉力件；所述屏幕板的正面为投影受光面，所述屏幕板的背面与所述连接布粘合，所述连接布覆盖所述屏幕板背面，并伸出所述屏幕板背面的至少一侧边缘之外；每个弹性拉力件的第一端均与所述连接布的一侧边缘连接，第二端与所述屏幕框架连接，以通过所述弹性拉力件的拉力将所述连接布和所述屏幕板拉伸至平整状态。
  2. 根据权利要求1所述的投影屏幕，其特征在于，所述弹性拉力件为下列任一一种：弹簧，橡胶件，弹性硅胶件。
  3. 根据权利要求1所述的投影屏幕，其特征在于，所述连接布覆盖于整个所述屏幕板的背面。
  4. 根据权利要求2所述的投影屏幕，其特征在于，多个所述弹性拉力件间隔设置在所述屏幕板的上下两侧；或者，多个所述弹性拉力件间隔设置在所述屏幕板的四周；或者，多个所述弹性拉力件间隔设置在所述屏幕板的上下两侧中的一侧。
  5. 根据权利要求1-4任一项所述的投影屏幕，其特征在于，所述屏幕框架包括外沿支撑部，所述外沿支撑部支撑在所述屏幕板的边缘的背面，并突出于所述屏幕板之外，所述连接布的边缘伸出至所述外沿支撑部的外侧后反向弯折，以在包裹所述外沿支撑部的边缘后与所述弹性拉力件连接。
  6. 根据权利要求5所述的投影屏幕，其特征在于，所述屏幕框架为中空框架，且所述屏幕框架设置有加强梁或者加强肋。
  7. 根据权利要求5所述的投影屏幕，其特征在于，所述外沿支撑部具有和所述屏幕板所在平面相互平行的支撑部。
  8. 根据权利要求7所述的投影屏幕，其特征在于，所述弹性拉力件的拉力方向与所述屏幕板所在的平面呈小于等于45度的夹角。
  9. 根据权利要求1-6任一项所述的投影屏幕，其特征在于，所述连接布的边缘穿设有至少一个用于和所述弹性拉力件连接的刚性棒材件。
  10. 根据权利要求1-6任一项所述的投影屏幕，其特征在于，所述投影屏幕还包括前装饰框，所述前装饰框和所述屏幕框架在相对应的角部位置设置有连接件。
  11. 根据权利要求1-6任一项所述的投影屏幕，其特征在于，所述屏幕框架具有用于和墙体支撑件连接的屏幕固定槽，所述屏幕固定槽具有向下的槽口。
  12. 一种投影系统，其特征在于，包括投影装置和权利要求1-11任一项所述的投影屏幕，所述投影装置用于向所述投影屏幕的屏幕板投射投影画面。
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