WO2019178982A1 - 投影屏幕及投影显示系统 - Google Patents

投影屏幕及投影显示系统 Download PDF

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Publication number
WO2019178982A1
WO2019178982A1 PCT/CN2018/094512 CN2018094512W WO2019178982A1 WO 2019178982 A1 WO2019178982 A1 WO 2019178982A1 CN 2018094512 W CN2018094512 W CN 2018094512W WO 2019178982 A1 WO2019178982 A1 WO 2019178982A1
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WO
WIPO (PCT)
Prior art keywords
screen
frame
connecting portion
edge
optical screen
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2018/094512
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English (en)
French (fr)
Inventor
李建军
鲁文生
杨长明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Hisense Laser Display Co Ltd
Original Assignee
Qingdao Hisense Laser Display Co Ltd
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
Priority claimed from CN201810225944.7A external-priority patent/CN108388074A/zh
Priority claimed from CN201810225934.3A external-priority patent/CN108398850A/zh
Priority claimed from CN201810225788.4A external-priority patent/CN108681201B/zh
Application filed by Qingdao Hisense Laser Display Co Ltd filed Critical Qingdao Hisense Laser Display Co Ltd
Publication of WO2019178982A1 publication Critical patent/WO2019178982A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present disclosure relates to the field of projection display, and more particularly to a projection screen and a projection display system.
  • projection display systems are increasingly used in people's work and life.
  • Laser projection has gradually occupied the market because of its wide color gamut, high brightness and long life.
  • projection screens of projection display systems typically include different types of soft screens and hard screens.
  • the hard screen has a good display effect because of its good optical gain uniformity, color reproduction and flatness.
  • the present disclosure provides a projection screen and a projection display system capable of fixing an optical screen and maintaining a good flatness of the optical screen.
  • Some embodiments of the present disclosure provide a projection screen including an optical screen, a flexible connection, a screen frame disposed on a side of the flexible connection away from the optical screen, and an elastic connector;
  • the first connecting portion of the flexible connecting portion is fixedly connected to the optical screen
  • a second connecting portion of the flexible connecting portion is coupled to the first end of the elastic connecting member, a second end of the elastic connecting member is coupled to the screen frame, and the elastic connecting member is configured to pass the flexible
  • the connecting portion stretches the optical screen to a flat state.
  • FIG. 1 is a schematic structural view of an orthographic projection optical screen in the related art
  • FIG. 2 is a schematic structural view of a back plate type fixing structure in the related art
  • FIG. 3 is a schematic structural diagram of a projection screen provided by some embodiments of the present disclosure.
  • FIG. 4 is a schematic exploded view of a projection screen provided by some embodiments of the present disclosure.
  • FIG. 5 is a schematic cross-sectional view of a projection screen provided by some embodiments of the present disclosure.
  • FIG. 6 is a partial schematic structural diagram of a projection screen provided by some embodiments of the present disclosure.
  • FIG. 7 is a schematic diagram of a back structure of a projection screen provided by some embodiments of the present disclosure.
  • FIG. 8 is a schematic structural diagram of an elastic connecting member in a projection screen provided by some embodiments of the present disclosure.
  • FIG. 9 is another partial structural diagram of a projection screen provided by some embodiments of the present disclosure.
  • Figure 10 is a schematic view showing the installation of the screen frame of Figure 9;
  • FIG. 11 is a schematic structural diagram of a support member of a projection screen provided by some embodiments of the present disclosure.
  • FIG. 12A is a partial exploded perspective view of another projection screen according to another embodiment of the present disclosure.
  • FIG. 12B is a schematic cross-sectional view of another projection screen provided by other embodiments of the present disclosure.
  • 12C is a partial structural assembly diagram of another projection screen provided by other embodiments of the present disclosure.
  • 13A is a front elevational view of a flexible joint provided by some embodiments of the present disclosure.
  • 13B is a front elevational view of a flexible joint provided by other embodiments of the present disclosure.
  • 13C is a front elevational view of a flexible joint provided by other embodiments of the present disclosure.
  • 13D is a front elevational view of a flexible joint provided by still other embodiments of the present disclosure.
  • FIG. 14 is a schematic structural diagram of a projection display system provided by some embodiments of the present disclosure.
  • the hard curtain generally includes an optical structural 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 colored layer 101 is located at the outermost side of the projection screen, and the projected image beam is first incident and finally emerges through the layer.
  • the main function of the colored layer is to improve the color reproduction capability of the projection screen, and sometimes the colored layer 101 can also be used as the substrate layer.
  • the substrate layer includes a colored layer and a hard film layer; the hard film layer mainly serves as a protective layer.
  • the diffusion layer 102 is mainly used for homogenizing incident light to homogenize, and expands the angle of the emitted light; Fresnel lens
  • the layer 103 is used to collimate the incident light beam in a range of angles and divergence the light beam reflected by the reflective layer 104.
  • the reflective layer 104 is typically an aluminum reflective film layer that is plated on the outside of the Fresnel lens layer 103.
  • FIG. 2 is a schematic structural view of a back plate type fixing structure in the related art. As shown in FIG.
  • the back plate type fixing structure includes a decorative frame 201 and a flat rigid back supporting plate 204, and the hard curtain 202 and the rigid back supporting plate 204 are fixed and fixed by the adhesive 203, and then The decorative frame 201 is attached to the edges of the back support plate 204 and the hard curtain 202, thereby completing the support and fixing of the hard curtain 202, so that the flatness of the hard curtain 202 can be maintained by the rigidity of the back support plate 204, and the hard curtain 202 is avoided. Deformation occurs.
  • the fixed screen is fixed by a monolithic back plate type fixing structure.
  • the area of the back supporting plate is large, and when the processing is performed, the large-sized plate is prone to deformation such as a bulge, and at the same time, the optical screen is glued to the back plate. Uneven coating on the sheet will also cause unevenness of the fit, which will affect the flatness of the entire hard screen.
  • this back-plate fixing method also makes the weight of the whole screen very large and is not convenient for transportation. And suspension, which limits the size of the projection size.
  • some embodiments of the present disclosure provide a projection screen including an optical screen 1, a flexible connecting portion 2, a screen frame 3 disposed on a side of the flexible connecting portion 2 away from the optical screen 1, and an elastic connecting member 4;
  • the first connecting portion of the flexible connecting portion 2 is fixedly connected to the optical screen 1, and the second connecting portion of the flexible connecting portion 2 is connected to the first end of the elastic connecting member 4, and the second end of the elastic connecting member 2 and the screen frame 3
  • the elastic connector 4 is configured to stretch the optical screen 1 to a flat state through the flexible joint 2.
  • the flexible connecting portion 2 is made of a soft material, which is soft, but has a certain rigidity, that is, a small elastic modulus, is not easily deformed, and can transmit force.
  • the flexible connecting portion 2 may be a soft cloth, that is, a soft connecting cloth, and a flexible woven fabric may be generally used. The following description will be made by taking a soft connecting cloth as an example.
  • optical screen 1 includes a Fresnel lens layer and a reflective layer.
  • FIG. 5 shows a schematic cross-sectional view of a projection screen provided by some embodiments of the present disclosure. 4 shows an exploded view of a projection screen provided by some embodiments of the present disclosure.
  • the optical screen 1 in the projection screen may be made of a hard material such as glass or plastic, and has a certain rigidity and strength, but there are still some deformations, so that when the optical screen 1 is stretched, a relatively flat surface can be formed.
  • the front side of the optical screen 1 (for example, the side facing the projector) is a projection light receiving surface.
  • at least a partial area of the front side of the optical screen 1 can be used as a light receiving area for projecting an image in order to project a picture and an image on the front side of the optical screen 1 for display.
  • the front surface of the optical screen 1 further includes a front upper edge, a front lower edge, a front left edge, and a front right edge disposed around the light receiving area.
  • the back side of the optical screen 1 refers to the side of the optical screen 1 opposite to the projected light-receiving surface of the optical screen 1.
  • the back surface of the optical screen 1 includes a back surface area opposite to the light-receiving area and is disposed around the back surface area and respectively respectively.
  • the front lower edge, the front left edge, and the front right edge are opposite the upper back edge, the lower back edge, the back left edge, and the back right edge.
  • the projection screen in this embodiment further includes a soft connecting cloth 2, and the connecting cloth 2 can be bonded to the optical screen 1 and connected with other bonding methods. Thereby the fixing of the optical screen 1 is completed.
  • connection cloth 2 and the optical screen 1 are bonded to each other, and thus the degree of stretching of the connecting cloth 2 also affects the curling or unfolding of the optical screen 1.
  • first connection portion of the connection cloth 2 is fixedly coupled to the optical screen 1 so that the back surface of the optical screen 1 can be attached to the first connection portion of the connection cloth 2.
  • the first connection portion of the connection cloth 2 is at least in conformity with the back surface area of the optical screen 1.
  • the connection cloth 2 is of sufficient size to fit at least the back surface area of the optical screen 1.
  • the back surface area is bonded to the first connection portion of the connection cloth 2.
  • the first connecting portion of the connecting cloth 2 may be a portion where the connecting cloth is attached to the back surface of the optical screen 1.
  • the optical screen 1 Since the optical screen 1 is usually vertically suspended when the screen is projected, the optical screen 1 is more likely to sag naturally due to its own weight. At this time, the optical screen 1 mainly causes inward curling or outward on the left and right sides. Zhang's phenomenon.
  • the back surface area, the back upper edge, and the back lower edge of the optical screen 1 may be in contact with the first connection portion of the connection cloth 2.
  • the first connecting portion of the connecting cloth 2 spans the entire optical screen 1 in the vertical direction, so that the upper back edge and the lower back edge of the optical screen 1 can be stretched by the connecting cloth 2, since the optical screen 1 is usually
  • the width in the horizontal direction is larger than the width in the vertical direction, so that the upper and lower sides of the optical screen 1 are reinforced and fixed by the connecting cloth 2, so that the inward curling or the outward stretching of the upper and lower sides can be avoided, and the left and right sides can be simultaneously suppressed.
  • the curling phenomenon causes the entire optical screen 1 to have a good flatness in all directions.
  • the “vertical direction” used in the present disclosure refers to the direction perpendicular to the horizontal plane of the optical screen 1 when the screen is projected
  • the “horizontal direction” refers to the direction of the optical screen 1 parallel to the horizontal plane when the screen is projected.
  • the central portion of the connecting cloth 2 is its first connecting portion 211, and the optical screen 1 can be attached to the central position of the connecting cloth 2, and the second connection of the connecting cloth 2 is attached.
  • the portion 212 extends outwardly from the upper rear edge and the lower rear edge of the optical screen 1 for connection with other structures. It should be understood that "outward" as used in the present disclosure refers to a direction away from the light receiving region of the optical screen 1 on the plane on which the optical screen 1 is projected when the screen is projected.
  • the first connection portion of the connection cloth 2 is attached to the back surface of the entire optical screen 1. That is, the first connecting portion of the connection cloth 2 is in contact with the back surface area, the back upper edge, the back lower edge, the back left edge, and the back right edge of the optical screen 1.
  • the entire optical screen 1 can be attached to the first connecting portion of the connecting cloth 2, so that the optical screen 1 can be stretched and stretched by the stretching of the connecting cloth 2, thereby maintaining better flatness.
  • the central portion of the connecting cloth 2 is its first connecting portion 211, and the optical screen 1 can be attached to the central position of the connecting cloth 2, and the second connection of the connecting cloth 2 is attached.
  • the portion 212 extends outwardly from the upper rear edge, the lower rear edge, the rear left edge, and the rear right edge of the optical screen 1 for connection with other structures.
  • the first connection portion of the connection cloth 2 is only in contact with the upper back edge and the lower back edge of the optical screen 1.
  • the portion of the connecting cloth 2 that is in contact with the upper rear edge and the lower rear edge of the optical screen 1 is its first connecting portion 211, and the second connection of the connecting cloth 2
  • the portion 212 extends outwardly from the upper and lower back edges of the optical screen 1 for attachment to other structures.
  • the first connecting portion of the connection cloth 2 is attached to the back upper edge, the back lower edge, the back left edge, and the back right edge of the optical screen 1 without being opposite to the back of the optical screen 1.
  • the portion of the connecting cloth 2 that is in contact with the upper rear edge, the lower rear edge, the rear left edge, and the rear right edge of the optical screen 1 is the first connecting portion 211.
  • the portion of the first connecting portion 211 corresponding to the back surface region is a through hole 213, and the second connecting portion 212 of the connecting cloth 2 is outward from the back upper edge, the back lower edge, the back left edge, and the back right edge of the optical screen 1. Extend to connect with other structures.
  • the first connection portion of the connection cloth 2 is attached to the back surface of the optical screen 1, and the second connection portion of the connection cloth 2 is from the back upper edge and the lower back edge of the optical screen 1, or Further, the back left edge and the back right edge are bent to the front side of the optical screen 1 to be bonded to the back upper edge and the back lower edge of the optical screen 1, or further, the back left edge and the back right edge. And then protrudes from the back upper edge and the back lower edge of the optical screen 1 in the direction away from the light receiving area of the optical screen 1, or further, the back left edge and the back right edge.
  • the projection screen further includes an elastic connecting member 4, and the elastic connecting member 4 itself has elasticity, so that the first end of the elastic connecting member 4 is fixed at When the second connecting portion of the cloth 2 is connected, and the second end is connected to the screen frame 3 disposed on the side of the first connecting portion of the connecting cloth 2 away from the optical screen 1, the connecting cloth 2 can be connected by its own elasticity.
  • the second connecting portion is expanded to force the second connecting portion of the connecting cloth 2 to open to a flat extended state.
  • the elastic direction of the elastic connecting member 4 is generally a pulling direction, that is, when the elastic connecting member 4 is connected between the second connecting portion of the connecting cloth 2 and the screen frame 3,
  • the elastic connecting member 4 can stretch the second connecting portion of the connecting cloth 2 toward the joint of the screen frame 3 with the second end of the elastic connecting member 4 until the second connecting portion of the connecting cloth 2 is opened to the extended state.
  • the connecting cloth 2 since the first connecting portion of the connecting cloth 2 and the optical screen 1 are bonded to each other and attached together, when the second connecting end of the elastic connecting member 4 and the screen frame 3 are stretched, the connecting cloth 2 is stretched.
  • the optical screen 1 is also stretched outward until the optical screen 1 is stretched to a flat state. At this time, the optical screen 1 can ensure better flatness, so that the picture and the image projected on the front side of the optical screen 1 have a better display effect, and the projection picture is prevented from being skewed and deformed.
  • the projection screen in the embodiment can fix the optical screen 1 through the connecting cloth 2, the elastic connecting member 4 and the screen frame 3, and at the same time, the second connecting fabric 2 can be made by the stretching action of the elastic connecting member 4.
  • the connecting portion is in a stretched state, and the tensile force is also applied to the optical screen 1 by the force transmission, so that the rigid optical screen 1 also exhibits a stretched and unfolded state, which facilitates the flatness of the optical screen 1.
  • the optical screen 1 is a Fresnel optical screen, which may generally be composed of a hard layer, a Fresnel structure layer, a projection layer, etc., having a certain strength and rigidity, and being free in vertical. In the drooping state, it can have a certain verticality so that the optical screen 1 looks flat, but since it still has a certain degree of softness, such as no support or interference by external force, the optical screen 1 cannot achieve the flatness requirement required for display, and the optical screen 1 Unevenness will cause distortion, blurring, uneven brightness, or other degradation problems when the laser projection screen is displayed.
  • connection cloth 2 is used as the connection structure, and the connection cloth 2 can have characteristics of less elasticity, bendability, ultra-thinness, compactness and high strength, so that the first connection portion of the connection cloth 2 is connected.
  • the connecting cloth 2 can generally be a soft cloth. In this way, the connecting cloth 2 can transmit the force better when being stretched, and the property is relatively stable, and can adapt to a wider environment, for example, maintaining a good flatness between ambient temperatures of -10 ° C to 40 ° C. And reliability.
  • the color of the connection cloth 2 may generally be black, such that the connection cloth 2 may cover the back surface area of the optical screen 1 to shield and protect the optical screen 1.
  • the optical screen 1 is an optical structural layer and has a certain light transmittance.
  • the innermost layer is a reflective layer, and the active surface of the reflective layer reflects the projected light (for example, an aluminized film). ), but since 100% reflectivity cannot be achieved, part of the light will pass through, which will cause the image contrast to drop.
  • the back surface of the optical screen 1 specifically, the back surface of the aluminum film is shielded by a black connecting cloth, which is advantageous for preventing light from leaking, and also preventing scratching of the back surface of the screen, etc., for the aluminum film and each optical structural layer. Play a protective role.
  • an adhesive that is, a glue is usually used to achieve the connection and fixation therebetween.
  • the back surface of the optical screen 1 is bonded to the first connecting portion of the connecting cloth 2 by gluing, and no space or gap is left between the back surface of the optical screen 1 and the first connecting portion of the connecting cloth 2, thereby It does not affect the display of the projected picture due to the air flow in the gap between the two (especially the flow of air caused by temperature changes).
  • the attachment may also be accomplished in the form of a Velcro or the like.
  • the adhesive for connecting the first connection portion of the optical screen 1 and the connection cloth 2 has a thermal expansion coefficient similar to or the same as that of the optical screen 1, or has a certain ductility, so that the optical screen 1 is generated due to temperature change.
  • the connecting cloth 2 will play a certain buffering effect, reduce the influence of the optical screen 1 on the projection picture due to thermal expansion and contraction deformation, and also help maintain the flatness of the hard optical screen 1 and prevent Because the expansion coefficients of the two are different, the expansion ratio is different, which causes the optical screen 1 to generate stress and affect the flatness.
  • the screen frame 3 is generally a frame structure, including an upper edge of the frame that is connected end to end, a lower edge of the frame, a left edge of the frame, and a right edge of the frame to form a rectangle or a square. a hollow area that can be used to house the optical screen 1, and the screen frame 3 can be disposed on a side of the first connecting portion 211 away from the optical screen 1, providing protection for the optical screen 1, while the screen frame 3 and the connecting cloth 2 are
  • the second connecting portions are connected by the elastic connecting member 4, and the specific structure and the connecting relationship of the screen frame 3 are as shown in FIG. 3 to FIG. 7, wherein the screen frame 3 on the upper side and the lower side of the optical screen 1 is convenient for description.
  • the structures on the left and right sides of the screen frame 3 also have similar structures and connection relationships with the upper and lower sides, and are not described herein again.
  • connection cloth 2 and the screen frame 3 are connected. 2.
  • the connection cloth is connected. 2.
  • the area of the screen frame 3 may be larger than the projected area of the connection cloth 2, and all or part of the screen frame 3 is located at the second connection portion of the connection cloth 2 outwardly away from the light receiving area of the optical screen 1. Outside.
  • the first end of the elastic connecting member 4 can be connected with the second connecting portion of the connecting cloth 2, and the second end of the elastic connecting member 4 protrudes outward from the second connecting portion of the connecting cloth 2, and is fixed at On the screen frame 3, the connecting cloth 2 can be fixed to the center of the screen frame 3 by means of the elastic connecting member 4, and the second connecting portion of the connecting cloth 2 is stretched by the elastic force of the elastic connecting member 4, so that the connecting cloth 2 is connected. Maintain a flat stretch.
  • the "outer side" used in the present disclosure is a side that points away from the light receiving area of the optical screen 1, that is, at least one of the upper side, the lower side, the left side, and the right side of the projection screen in the normal use state.
  • the elastic connecting member 4 Since the second connecting portion of the connecting cloth 2 is wound from the front surface of the screen frame to the side of the screen frame, the first end of the elastic connecting member 4 is connected to the second connecting portion of the connecting cloth 2, and the second end of the elastic connecting member 4 is fixed.
  • the outer side of the second connecting portion of the connecting cloth 2 will wrap a part of the screen frame 3, so that the outer side of the back surface area of the optical screen 1 of the projection screen away from the optical screen 1 needs to have a wider bezel area to accommodate the connection.
  • the elastic connecting member 4 may be disposed at other positions to reduce the size of the area of the front surface of the optical screen 1 of the projection screen 4 and the screen frame 3.
  • the screen frame 3 may include a support surface which is a side of the screen frame 3 facing the optical screen 1, and the screen frame 1 further includes a side surface and a fixing elastic connecting member
  • the fixing surface of the fixed surface is the surface of the screen frame 3 away from the optical screen 1
  • the side surface is the surface connecting the supporting surface and the fixing surface on the outer side of the screen frame 3.
  • the second connecting portion of the connecting cloth 2 is wound along the side to the fixing surface. And connected to the elastic connecting member 4 fixed on the fixing surface.
  • the area of the supporting surface is larger than the projected area of the optical screen 1, and thus the supporting surface of the screen frame 3 and the first connecting portion of the connecting cloth 2 are away from the optical One side of the screen 1 is attached.
  • the second connecting portion of the connecting cloth 2 is located on the back upper edge, the back lower edge, the back left edge and the back right edge of the optical screen 1, and can continue to protrude outward, and The side of the screen frame 3 is wound around the fixing surface, the side of the screen frame 3 is wrapped, and then connected to the elastic connecting member 4 fixed to the fixing surface.
  • the second connecting portion of the connecting cloth 2 is equivalent to being wrapped on the side of the screen frame 3, and the side of the screen frame 3 can support the second connecting portion of the connecting cloth 2 as a supporting point.
  • the side surface of the screen frame 3 can be equivalent to a fixed pulley, so that the supporting surface of the screen frame 3 and the second connecting portion of the connecting cloth 2 on the fixing surface move in two different directions by the support of the side, when When the elastic connecting member 4 applies a pulling force away from the side surface to the second connecting portion of the connecting cloth 2 on the fixing surface, the second connecting portion of the connecting cloth 2 on the supporting surface is pulled in the reverse direction and is close to the side. The direction moves, which results in stretching and stretching.
  • the side of the screen frame 3 can be a flat surface, which in some embodiments is a curved side.
  • the position of the elastic connecting member 4 is no longer limited to the outside of the second connecting portion of the connecting cloth 2, but can be set at The coverage of the connecting cloth 2 is extended.
  • the first end of the resilient connector 4, that is, the end that is coupled to the second attachment portion of the attachment tab 2 may be closer to the side of the screen frame 3 than the second end of the resilient connector 4.
  • the elastic connecting member 4 can be hidden in the back direction of the optical screen 1, so that the elastic connecting member 4 is shielded by the front optical screen 1 and the connecting cloth 2, which is difficult to see from the front side of the projection screen.
  • the area of the back upper edge, the back lower edge, the back left edge and the back right edge of the optical screen 1 no longer has the elastic connecting member 4, but only the second connecting portion of the connecting cloth 2 and the screen frame. 3, so the formed border area has a small width, which can effectively enhance the appearance of the projection screen.
  • the optical screen 1 is generally composed of a hard material, thermal expansion and contraction occurs when the temperature of the external environment changes.
  • the optical screen 1 is inflated and contracted, if the back upper edge, the back lower edge, the back left edge, and the back right edge of the optical screen 1 exceed the side of the screen frame 3, a phenomenon such as bumping may occur.
  • the side of the screen frame 3 is usually located on the back upper edge, the back lower edge, the back left edge and the back right edge of the screen panel 1. At this time, the screen frame 3 can provide sufficient positioning and protection for the optical screen 1 when the external environment changes.
  • the pulling direction of the elastic connecting member 4 can be kept parallel or nearly parallel to the plane in which the optical screen 1 is located. This can bring two advantages: on the one hand, the overall volume and thickness of the projection screen can be reduced, and when the elastic connecting member 4 is elastically deformed, the direction of the elastic deformation is located in the plane of the optical screen or is compared with the plane.
  • the second connection of the elastic connecting member 4 and the connecting cloth 2 is different depending on the type and structure of the elastic connecting member 4.
  • the screen frame 3 is a rigid body, it can be connected with the elastic connecting member 4 by a common fixing manner such as a snap connection, a threaded fastener connection or a riveting.
  • the connecting cloth 2 is made of a relatively soft material and is inconvenient to be directly connected to the elastic connecting member 4, it is usually required to fix a rigid connecting structure on the second connecting portion of the connecting cloth 2, and connect the connecting structure by using the connecting structure.
  • the second connecting portion of the cloth 2 is coupled to the elastic connecting member 4.
  • the projection screen includes a rigid fixture 21 that is secured to the second attachment portion of the attachment cloth 2 and that is coupled to the first end of the resilient connector 4.
  • the end of the second connecting portion of the connecting cloth 2 can be enclosed in a closed shape, so that the rigid fixing member 21 can be fixed inside the closed shape, This achieves a fixation between the rigid fixing member 21 and the second connecting portion of the connecting cloth 2.
  • the rigid fixture 21 can be of a variety of different shapes and configurations, such as a straight rod-like structure, such as a crossbar.
  • the second connecting portion of the connecting cloth 2 can be curled inwardly and sewn together with the inner side of the second connecting portion of the connecting cloth 2, so that the second connecting portion of the connecting cloth 2 can be formed with a closed hole.
  • a rigid fixing member 21 for a straight rod shape is bored therein.
  • the rigid connecting member 21 Since the second connecting portion of the connecting cloth 2 can be connected to the elastic connecting member 4 through the rigid fixing member 21, the rigid connecting member 21 is used to carry the force, and the second connecting portion of the connecting cloth 2 is less likely to be torn or damaged, and the phase is Compared to directly attaching to the connecting cloth 2, such as a hole or a ring, since the number of the elastic connecting members 4 is limited, the rigid fixing member 21 can exert a tensile force on the finite number of elastic connecting members 4 over the entire rigid fixing member 21.
  • the rigid fixing member 21 is a rigid bar structure, and may be selected from glass fiber or metal material, and is not easily deformed by force.
  • a through hole may be provided at a portion of the second connecting portion of the connecting cloth 2 near the elastic connecting member 4, and a metal ring may be disposed at an inner edge of the through hole to facilitate the elastic connecting member 4 and the connecting cloth 2
  • the fixing of the second connecting portion slows the wear of the connecting cloth 2 at the connection position with the elastic connecting member 4.
  • the elastic connecting member 4 in order to connect the rigid fixing member 21, the elastic connecting member 4 may generally be a pulling spring, and the first end of the pulling spring may be connected to the rigid fixing member 21 in a hanging manner or the like.
  • the second end of the spring is fixed to the screen frame 3.
  • the first end of the pull-up spring that is coupled to the rigid fixture 21 can be a hook or a loop to hang up with the rigid fixture 21.
  • the elastic connecting member 4 can also be an elastic connecting structure commonly used by those skilled in the art such as a rubber body, and details are not described herein again.
  • FIG. 8 is a schematic structural diagram of an elastic connecting member in a projection screen provided by some embodiments of the present disclosure.
  • the side of the pull-out spring may be provided with a tension ring 41 for hooking foreign objects.
  • the operator can perform the loading/unloading or stretching operation of the tension spring by inserting a hand or other object into the tension ring 41, thereby facilitating the assembly between the tension spring and the rigid fixing member 21 and the screen frame 3 or Disassembly operation.
  • each of the rigid fixing members 21 may be correspondingly coupled to the plurality of elastic connecting members 4.
  • the rigid fixing member 21 is a cross bar
  • a plurality of elastic connecting members 4 can be connected to each cross bar, and the plurality of elastic connecting members 4 are spaced apart from different rod segments on the cross bar, which can effectively simplify the overall projection screen. structure.
  • the rigid fixing members 21 can also be connected to the elastic connecting members 4 in a one-to-one correspondence.
  • the connecting manner is generally applicable to the structure in which the rigid fixing members 21 have a small outer shape such as a closed ring.
  • the elastic connecting member 4 needs to have sufficient tensile strength when fixing and stretching the optical screen 1 to ensure that the optical screen 1 is effectively fixed and has a good flatness.
  • the elastic connecting member 4 itself needs to adopt an elastic material having an adaptive environment cold and heat change, and can be adapted and changed according to changes in ambient temperature or force, and the elastic connecting member 4 is taken as an example for the spring, when the optical screen 1 is 80 inches.
  • the weight of the optical screen 1 is usually 5 kg (the weight of the connecting cloth 2 is light and can be omitted), so that the effective number of turns of the spring can be designed to be 6 turns and the free height is about 23 mm; and when the spring is on the optical screen 1 When fixed, the spring will stretch to 30mm, ie the elongation is 7mm.
  • the optical screen 1 Since the area of the optical screen 1 is large, it is generally required that a plurality of elastic connecting members 4 are stretched together to allow the optical screen 1 and the connecting cloth 2 to be effectively unfolded into a flat state.
  • the elastic connectors 4 are spaced apart and have a suitable arrangement density. In this way, the optical screen 1 can be provided with sufficient indirect tensile force by means of a plurality of elastic connecting members 4, and on the other hand, the elastic connecting member 4 has a suitable number, and the installation of the elastic connecting member 4 can be prevented from being excessively large. difficult.
  • the spacing between adjacent elastic connecting members is about 134 mm, the optical screen 1 can be fixed while ensuring sufficient flatness of the optical screen 1.
  • the frame upper edge, the frame lower edge, the frame left edge, and the frame right edge of the screen frame 34 are spaced apart from each other with a plurality of elastic connecting members 4, such as equidistantly symmetrically disposed, such that optical The upper and lower left and right directions of the screen 1 are subjected to the pulling force of the elastic connecting member 4, so that the optical screen 1 can be effectively stretched in all directions to maintain a flat state.
  • the optical screen 1 itself is a hard optical screen, it is easy to naturally sag due to its own weight when the vertical hanging is set, and the left and right sides of the optical screen 1 may curl inward or outward.
  • the upper edge of the frame of the screen frame 3 and the lower edge of the frame are spaced apart from each other with a plurality of elastic connecting members 4, so that the optical screen 1 is subjected to the upper and lower stretching forces throughout the width of the screen.
  • the upper and lower sides are fixed in the width direction, preventing the upper and lower sides from being inwardly curled or outward due to insufficient fixing force, and due to the optical screen 1
  • the width in the horizontal direction is larger than the width in the vertical direction, and thus 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 connecting member 4 to the optical screen 1 can be ensured, and the number of the elastic connecting members 4 is small, and the mounting is convenient.
  • the arrangement of the elastic connecting member is applicable to the case where the back surface area, the back upper edge and the back lower edge of the optical screen 1 are in contact with the first connecting portion of the connecting cloth 2, and is also applicable.
  • the case where the first connecting portion of the connecting cloth 2 is in contact with the back surface of the entire optical screen 1 is used.
  • the frame upper edge, the frame lower edge, the frame left edge, and the frame right edge of the screen frame 3 are spaced apart from each other with a plurality of elastic connectors 4, they are disposed at the upper edge of the frame and
  • the elastic connecting member 4 at the lower edge of the frame is disposed at a lower density than the elastic connecting member 4 disposed at the left edge of the frame and the right edge of the frame, such that the elastic connecting member 4 is still wrapped around the screen frame 3, but the screen frame 3
  • the upper edge of the frame and the elastic connecting member 4 at the lower edge of the frame are densely arranged, and the elastic connecting members 4 at the left edge of the frame and the right edge of the frame are relatively sparse, so that the tensile forces on the upper and lower sides of the optical screen 1 are relatively thin.
  • the elastic connecting member 4 thus arranged can still apply appropriate stretching force to all directions of the optical screen 1 in combination with the stretching requirements of the optical screen 1 in different directions, thereby achieving better stretching and fixing effects due to the elastic connecting member. 4
  • the reduction in quantity also brings convenience to the installation.
  • the arrangement of the elastic connecting members 4 is mainly applicable to the connecting cloth 2.
  • the first connecting portion of the connecting cloth 2 is in contact with the back surface area of the optical screen 1, the back upper edge and the back lower edge of the optical screen 1, because the back left edge and the back right edge of the optical screen 1 are not connected to the connecting cloth.
  • the first connecting portion of 2 is fitted, so it is not appropriate to arrange the elastic connecting member 4 at the left edge of the frame and the right edge of the frame.
  • FIG. 9 is another partial structural schematic diagram of a screen frame provided by some embodiments of the present disclosure.
  • Figure 10 is a schematic view showing the mounting of the screen frame of Figure 9. As shown in FIGS.
  • the screen frame 3 has a screen fixing groove 32 provided at least on the back side of the upper edge of the frame of the screen frame 3, including extending horizontally perpendicular to the screen frame.
  • the horizontal portion and the vertical portion extending vertically at an end of the horizontal portion away from the screen frame, the screen frame, the horizontal portion and the vertical portion collectively form a fixed groove 32 that is open on one side.
  • a pylon assembly 5 is disposed on the wall as a wall support member; wherein the pylon assembly 5 includes a support member 51 having a hook end 511 for inserting the screen fixing groove 32 and supporting the screen frame 3, supporting The piece 51 has a variable position in the vertical direction with respect to the wall.
  • the pylon assembly 5 may further include a wall fixing member 52 which may be fixed to a predetermined position on the wall by a fixing bolt or the like, and the wall fixing member 52 may be generally provided with a moving structure in the vertical direction, for example, for example.
  • the bolt 521 is disposed on the wall fixing member 52.
  • the support member 51 is disposed on the vertical bolt 521, and the portion of the vertical bolt 521 below the support member 51 is sleeved with a nut 522, a nut 522 and a vertical bolt.
  • the 521 is screwed together, and when the nut 522 rotates around the vertical bolt 521, the nut 522 can move up and down along the length of the vertical bolt 521, and the support member 51 is moved in the vertical direction with respect to the wall.
  • the screen frame 3 is driven to adjust the height.
  • the screen frame 3 of such a projection screen can be attached to the pylon assembly 5 to achieve relative fixation between the projection screen and the wall.
  • the fixed structure of the optical screen also serves as a wall-hanging structure of the entire projection screen, which can simplify the structure of the projection screen, and is advantageous for reducing the distance or thickness between the projection optical screen and the wall, and at the same time, the optical screen.
  • the integration of the fixed and wall-mounted structure also facilitates the simplification and weight reduction of the entire screen structure, and facilitates the realization of a large-sized projection display.
  • FIG. 11 is a schematic structural view of a support member 51 provided by some embodiments of the present disclosure.
  • the support member 51 may be provided with a plurality of fixing holes 512 arranged at intervals in the vertical direction, so that the setting can be made through the fixing holes 512.
  • a bit bolt (not shown) is used to complete the fixing between the support member 51 and the wall.
  • the body of the support member 51 can also have a variety of different shapes or configurations.
  • the shape of the hook end 511 of the support member 51 matches the shape of the screen securing slot 32 of the screen frame 3.
  • the hook end 511 of the support member 51 may be a rectangle matching the shape of the screen fixing groove 32.
  • the rectangular hanging end 511 has a certain thickness and can be caught in the screen fixing groove 32, and reduces or eliminates the shaking of the hanging end 511 in the screen fixing groove 32, thereby ensuring that the screen frame 3 is effectively fixed.
  • the hooking end 511 of the support member 51 may have a circular arc-shaped sliding surface as shown in FIG.
  • the arc-shaped sliding surface of the hanging end 511 does not coincide with the shape of the groove wall of the screen fixing groove 32, but the holding point Contact or line contact relationship.
  • a certain sliding can be generated along the sliding surface between the hook end 511 of the support member 51 and the screen fixing groove 32, thereby maintaining a relatively flexible relative position.
  • the front surface of the optical screen 1 is further provided with a front decorative frame (not shown) for covering the second connecting portion of the connecting cloth 2,
  • the front decorative frame is connected to the screen frame 3.
  • the front decorative frame can be disposed on the screen frame 3, and the second connecting portion of the connecting cloth 2 exposed on the back upper edge, the back lower edge, the back left edge, and the back right edge of the optical screen 1 is covered to avoid the connection.
  • the cloth 2 is exposed so that the front upper edge, the front lower edge, the front left edge and the front right edge of the optical screen 1 are front decorative frames to effectively enhance the frontal appearance of the projection screen.
  • the front decorative frame and the screen frame 3 have similar structures, and each has a rectangular frame structure.
  • the surface of the front decorative frame may be treated by a surface treatment process such as electroplating, drawing or painting to further enhance the aesthetics.
  • connection manner commonly used by those skilled in the art such as snapping, bonding or threaded fastener connection, may be employed between the front decorative frame and the screen frame 3.
  • the projection screen includes an optical screen, a flexible connecting portion, a screen frame disposed on a side of the flexible connecting portion away from the optical screen, and an elastic connecting member; the first of the flexible connecting portions a connecting portion is fixedly connected to the optical screen; a second connecting portion of the flexible connecting portion is connected to the first end of the elastic connecting member, and a second end of the elastic connecting member is connected to the screen frame,
  • the elastic connector is configured to stretch the optical screen to a flat state through the flexible connecting portion, achieving fixation and positioning between the optical screen and the screen frame, and the optical screen can be flat on the elasticity of the elastic connecting member Stretching state, improving the projection screen display effect.
  • Some embodiments of the present disclosure provide a projection screen that uses a frame-type screen frame to fix an optical screen, and uses a soft connecting material to transmit elastic stretching force to achieve optical screen fixing, and also pulls the optical screen. Stretching and flattening, the fixing and stretching results of the above optical screen reduce the overall weight of the projection screen on the one hand, greatly reduce the material cost, and on the other hand, it is easier to achieve a uniform flatness of the hard optical screen, and the flatness is achieved.
  • the method has the characteristics of self-adaptation, can better adapt to the change of the thermal expansion and contraction of the optical screen, the flatness is easy to maintain, and the practicability is high.
  • the soft webbing does not completely conform to the back side of the entire optical screen.
  • the flexible connecting portion 2 is specifically a soft connecting cloth, the first connecting portion of the connecting cloth 2 and the back upper edge, the back lower edge, the back left edge and the back right edge of the optical screen 1
  • One or more fits, or the first connection portion of the connection cloth 2 is adhered to one or more of the front upper edge, the front lower edge, the front left edge and the front right edge of the optical screen 1,
  • the second connecting portion of the connecting cloth 2 is connected to the elastic connecting member 4.
  • the resilient link 4 is hooked onto the rigid bar by providing a closed end at the second connection of the attachment cloth 2 to receive the rigid bar.
  • the connecting cloth 2 is attached to both the front and the back of the optical screen 1. In the above manner, the connecting cloth 2 does not adhere to the entire back surface of the optical screen 1, and only fits to the front surface of the optical screen 1 or the edge of the back surface.
  • the connecting cloth 2 can be attached to the front and back sides of the optical screen 1 at the same time.
  • the first connecting portion of the connecting cloth 2 is simultaneously attached to the front and back sides of the optical screen 1, in which The first portion 12a is attached to the front surface of the optical screen 1, and the second portion 12b is attached to the back surface of the optical screen 1.
  • the first portion 12a of the first connecting portion is connected to the first portion of the second connecting portion of the connecting cloth 2
  • the second portion 12b of the first connecting portion is connected to the second portion of the second connecting portion
  • the first portion of the second connecting portion is The second portion may be used to connect with the elastic connector 4 or the like, and the first portion 12a and the second portion 12b of the first connecting portion sandwich the second connecting portion of the optical screen therebetween to connect the cloth 2 and the optical screen
  • the connection between 1 is fixed.
  • the first portion 12a and the second portion 12b of the first connection portion of the connection cloth 2 are connected in a "U" shape, and the closed end of the "U" shape is connected to the second connection of the connection cloth 2.
  • the second connecting portion of the connecting cloth 2 can be used for connection with the elastic connecting member 4 or the like, and the first portion 12a and the second portion 12b of the first connecting portion sandwich the second connecting portion of the optical screen therebetween.
  • the connection between the connection cloth 2 and the optical screen 1 is fixed.
  • the first connecting portion of the connecting cloth 2 since the connecting cloth 2 located at the lower edge region of the optical screen 1 has a small force to be received, the first connecting portion of the connecting cloth 2 may be attached only to one side of the optical screen 1. For example, it is attached to the back of the optical screen 1.
  • connection strength between the optical screen 1 and the first connecting portion of the connecting cloth 2 is usually the same as that of the first connecting portion of the connecting cloth 2, whether it is glued with an adhesive or a structure such as a Velcro.
  • the area is proportional.
  • the first connecting portion of the connecting cloth 2 can be normally connected to the front and back sides of the optical screen 1 at the same time, thereby improving the edge and connection of the optical screen 1.
  • the area of the first portion 12a that fits the front surface of the optical screen 1 can be made. It is smaller than the area of the second portion 12b that is attached to the back surface of the optical screen 1.
  • the length of the first portion 12a in the horizontal direction is equal to the length of the front upper edge and/or the front lower edge of the optical screen 1 in the horizontal direction, and the first portion 12a is vertical.
  • the width of the direction is such that it extends in the vertical direction along the front upper edge and/or the front lower edge, and the length of the second portion 12b in the horizontal direction is equal to the back upper edge of the optical screen 1 and/or the lower back edge is horizontal.
  • the length of the second portion 12b in the vertical direction is such that it extends in the vertical direction along the upper edge of the back surface and/or the lower edge of the back surface.
  • the width of the second portion 12b extends in the horizontal direction along the front left edge and/or the front right edge, and the length of the second portion 12b in the vertical direction is equal to the back left edge and/or the back right edge of the optical screen 1 in the vertical direction.
  • the length of the second portion 12b in the horizontal direction is such that it extends in the horizontal direction along the back left edge and/or the back right edge.
  • the first portion 12a of the front surface of the optical screen 1 has a small area, and can form a narrow frame width; and the second portion 12b located at the back of the optical screen 1 can realize a larger connection area and ensure the first connection of the connection cloth 2.
  • a reliable connection between the part and the optical screen 1. In general, it is generally possible to maintain the first portion 12a on the front side of the optical screen 1 at a width of about 10 mm, and the second portion 12b on the back side of the optical screen 1 to maintain a width of about 50 mm.
  • the projection screen may further include a protective cloth that is attached to the back surface area of the optical screen 1. Hehe. This is because the hard optical screen 1 is an optical structural layer and has a certain light transmittance. Especially when it is used as a front projection screen, the innermost layer is a reflective layer, and the active surface of the reflective layer reflects the projected light (for example, Aluminized film), but due to the inability to achieve 100% reflectivity, all of the light will pass through, which will cause the image contrast to drop.
  • the projected light for example, Aluminized film
  • the back surface of the aluminum film can be shielded by a dark (for example, black) protective cloth to facilitate light leakage and prevent optical.
  • the back of the screen 1 is scratched or the like to protect the aluminum film and each optical structure layer.
  • the protective cloth may be of various materials such as a fiber material, a plastic or a material for shading protection commonly used by those skilled in the art.
  • the first portion and the second portion of the second connecting portion of the cloth 2 are joined, or, in the connecting cloth 2
  • the second connecting portion of the connecting cloth 2 is wound along the side of the screen frame 3 toward the fixing surface, and the connecting cloth is connected.
  • the end of the second connecting portion of the second portion is provided with a rigid fixing bar for hooking the elastic connecting member 4 fixed to the fixing surface.
  • the selection and use of the rigid fixed bar can be similar to the foregoing embodiment of the present disclosure, and details are not described herein again.
  • the elastic connecting member is disposed at the upper edge of the frame of the screen frame 3 and at the lower edge of the frame for Connecting the upper and lower screen frames and the upper and lower sides of the optical screen.
  • the elastic connecting members may be distributed around the optical screen or the screen frame.
  • the pieces 4 can be spaced apart and have a suitable arrangement density.
  • the optical screen 1 can be provided with sufficient indirect tensile force by means of a plurality of elastic connecting members 4, and on the other hand, the elastic connecting member 4 has a suitable number, and the projection of the elastic connecting member 4 can be prevented from being excessively large.
  • the installation of the screen is difficult.
  • the optical screen 1 can be fixed while ensuring sufficient flatness of the optical screen 1.
  • the frame upper edge, the frame lower edge, the frame left edge and the frame right edge of the screen frame 3 are spaced apart from each other with a plurality of elastic connecting members 4, for example, respectively arranged at equal intervals in a symmetric direction.
  • the up, down, left, and right directions of the screen panel 1 are subjected to the pulling force of the elastic connecting member 4, so that the optical screen 1 can be effectively stretched in all directions to maintain a flat state.
  • the optical screen 1 itself is a hard optical screen, it is easy to naturally sag due to its own weight when the vertical hanging is set, and the left and right sides of the optical screen 1 may curl inward or outward.
  • the upper edge of the frame of the screen frame 3 and the lower edge of the frame are spaced apart from each other with a plurality of elastic connecting members 4, so that the optical screen 1 is subjected to the upper and lower stretching forces throughout the width of the screen.
  • the upper and lower sides are fixed in the width direction, preventing the upper and lower sides from being inwardly curled or outward due to insufficient fixing force, and due to the optical screen 1
  • the width in the horizontal direction is larger than the width in the vertical direction, and thus 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 connecting member 4 to the optical screen 1 can be ensured, and the number of the elastic connecting members 4 is small, and the mounting is convenient.
  • the above-mentioned elastic connecting member is arranged in a manner that the upper back edge and the lower back edge of the optical screen 1 are in contact with the first connecting portion of the connecting cloth 2, as shown in FIG. 13A.
  • the connecting cloth 2 can also be applied to the case where the back surface area, the back upper edge and the back lower edge of the optical screen 1 are in contact with the first connecting portion of the connecting cloth 2, as shown in FIG. 13B, the connecting cloth 2 can also be used.
  • the connecting cloth 2 can also be used.
  • the connecting cloth 2 Suitable for the case where the first connecting portion of the connecting cloth 2 is attached to the back surface of the entire optical screen 1, the connecting cloth 2 as shown in FIG. 13C, and even the first connecting portion of the connecting cloth 2 and the optical screen 1
  • the back upper edge, the back lower edge, the back left edge, and the back right edge are fitted together, as shown in Fig. 13D.
  • the upper frame edge, the frame lower edge, the frame left edge, and the frame right edge of the screen frame 3 are spaced apart from each other with a plurality of elastic connectors 4, they are disposed under the frame upper edge and the frame.
  • the elastic connector 4 at the edge is disposed at a lower density than the elastic connector 4 disposed at the left edge of the frame and the right edge of the frame.
  • the elastic connecting member 4 still surrounds the screen frame 3, but the upper edge of the frame of the screen frame 3 and the elastic connecting member 4 at the lower edge of the frame are densely arranged, while the left edge of the frame and the elastic connecting member at the right edge of the frame 4
  • the setting is relatively sparse, so the upper and lower sides of the optical screen 1 are subjected to a large tensile force, which can effectively resist the inward curling or outward tension of the optical screen 1; and the optical screen 1 is vertically sagged due to natural sag.
  • the stress is very small, so the stretching force on the left and right sides of the optical screen 1 is small.
  • the elastic connecting member 4 thus arranged can still apply appropriate stretching force to all directions of the optical screen 1 in combination with the stretching requirements of the optical screen 1 in different directions, thereby achieving better stretching and fixing effects due to the elastic connecting member. 4
  • the reduction in quantity also brings convenience to the installation.
  • another projection screen structure is partially adhered to the optical screen by a soft connecting cloth, and the optical screen is fixed to the screen frame by the tensile force of the elastic connecting member, and the optical screen is realized.
  • the optical screen is stretched to a flat state, so that the flatness of the optical screen is better, and the display quality of the projected picture is improved.
  • the projection display system provided by these embodiments of the present disclosure includes a projection device 10 and a projection screen 11 in the foregoing embodiments for projecting a projection image onto an optical screen of a projection screen, in some embodiments of the present disclosure, projection
  • the device is a laser ultra-short-focus projection device with a small throw ratio, and projects the projection beam obliquely upward on the projection screen 11 at a large oblique angle.
  • the projection screen 11 is a front projection screen, and reflects light into the human eye to form a picture.
  • the specific structure, working principle and function of the projection screen have been described in detail in the foregoing embodiments, and are not described herein again.
  • the projection screen may include an optical screen, a flexible connecting portion, a screen frame disposed on a side of the flexible connecting portion away from the optical screen, and an elastic connecting member; thus the optical screen is fixed At the same time, it has better flatness, which is beneficial to improve the quality of projection display.

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Abstract

一种投影屏幕及投影显示系统。投影屏幕包括光学屏幕（1）、柔性连接部（2）、设置在柔性连接部（2）远离光学屏幕（1）的一侧的屏幕框架（3）以及弹性连接件（4）；柔性连接部（2）的第一连接部与光学屏幕（1）固定连接；柔性连接部（2）的第二连接部与弹性连接件（4）的第一端连接，弹性连接件（4）的第二端与屏幕框架（3）连接，弹性连接件（4）被配置为通过柔性连接部（2）将光学屏幕（1）拉伸至平整状态。投影屏幕在对光学屏幕（1）进行固定的同时还可以保持较好的平整度。投影显示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光学屏幕（1）投射投影画面。

Description

投影屏幕及投影显示系统
本申请要求于2018年3月19日提交中国专利局、申请号为201810225944.7、发明名称为“投影屏幕及投影系统”的中国专利申请、于2018年3月19日提交中国专利局、申请号为201810225934.3、发明名称为“投影屏幕及投影系统”的中国专利申请和于2018年3月19日提交中国专利局、申请号为201810225788.4、发明名称为“投影屏幕及投影显示系统”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显示系统。
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显示系统，能够对光学屏幕进行固定，并使光学屏幕保持较好的平整度。
本公开的一些实施例提供一种投影屏幕，包括光学屏幕、柔性连接部、设置在所述柔性连接部远离所述光学屏幕的一侧的屏幕框架以及弹性连接件；
所述柔性连接部的第一连接部与所述光学屏幕固定连接；
所述柔性连接部的第二连接部与所述弹性连接件的第一端连接，所述弹性连接件的第二端与所述屏幕框架连接，所述弹性连接件被配置为通过所述柔性连接部将所述光学屏幕拉伸至平整状态。
本公开的另一些实施例提供一种投影显示系统，包括投影装置和前述实施例中的投影屏幕，投影装置用于向投影屏幕的光学屏幕投射投影画面。
附图说明
为了更清楚地说明本公开实施例或相关技术中的技术方案，下面将对实施例或相关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是本公开的一些实施例提供的投影屏幕的结构示意图；
图4是本公开的一些实施例提供的投影屏幕的爆炸示意图；
图5是本公开的一些实施例提供的投影屏幕的截面示意图；
图6是本公开的一些实施例提供的投影屏幕的一种局部结构示意图；
图7是本公开的一些实施例提供的投影屏幕的背面结构示意图；
图8是本公开的一些实施例提供的投影屏幕中的弹性连接件的一种结构示意图；
图9是本公开的一些实施例提供的投影屏幕的另一种局部结构示意图；
图10是图9中的屏幕框架的安装示意图；
图11是本公开的一些实施例提供的投影屏幕的支撑件的结构示意图；
图12A是本公开的另一些实施例提供的另一种投影屏幕的局部结构分解示意图；
图12B是本公开的另一些实施例提供的另一种投影屏幕的截面示意图；
图12C是本公开的另一些实施例提供的另一种投影屏幕的局部结构组装示意图；
图13A是本公开的一些实施例提供的柔性连接部的正视图；
图13B是本公开的另一些实施例提供的柔性连接部的正视图；
图13C是本公开的另一些实施例提供的柔性连接部的正视图；
图13D是本公开的又一些实施例提供的柔性连接部的正视图；
图14是本公开的一些实施例提供的投影显示系统的结构示意图。
具体实施方式
相关技术中的一种实施例如图1的一种正投影光学屏幕的结构示意图所示。以图1所示的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，具体的，背板式固定结构包括有装饰边框201和平板状的刚性的背部支撑板材204，将硬幕202与刚性的背部支撑板材204通过粘接剂203贴合固定，再将装饰边框201连接在背部支撑板材204和硬幕202的边缘上，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贴合的不平整性，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。
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。
如图3所示，本公开的一些实施例提供的投影屏幕，包括光学屏幕1、柔性连接部2、设置在柔性连接部2远离光学屏幕1的一侧的屏幕框架3以及弹性连接件4；其中，柔性连接部2的第一连接部与光学屏幕1固定连接，柔性连接部2的第二连接部与弹性连接件4的第一端连接，弹性连接件2的第二端与屏幕框架3连接；弹性连接件4被配置为通过柔性连接部2将光学屏幕1拉伸至平整状态。
在本公开的一些实施例中，柔性连接部2的材质为软质材料，较软，但具有一定的刚性，即弹性系数较小，不易发生形变，可以进行力的传递。在一种实施例中，柔性连接部2可以为软布，即软质的连接布，通常可以采用可弯曲的纺织物，以下均以软质的连接布为例进行说明。
在本公开的一些实施例中，光学屏幕1包括菲涅尔透镜层和反射层。
图5示出了本公开的一些实施例提供的投影屏幕的截面示意图。图4示出了本公开的一些实施例提供的投影屏幕的爆炸示意图。
投影屏幕中的光学屏幕1可以由玻璃或塑料等硬质材料构成，具有一定的刚度与强度，但仍会存在一些形变，因而当光学屏幕1被拉伸时，即能够形成较为平整的表面。光学屏幕1的正面(例如，朝向投影机的一面)为投影受光面。这样，光学屏幕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光学屏幕1正面进行显示。除了受光区域，光学屏幕1的正面还包括设置在受光区域四周的正面上边缘、正面下边缘、正面左边缘和正面右边缘。光学屏幕1的背面是指光学屏幕1上与光学屏幕1的投影受光面相对的一面，光学屏幕1的背面包括与受光区域相对的背面区域和设置在背面区域的四周并分别与正面上边缘、正面下边缘、正面左边缘和正面右边缘相对的背面上边缘、背面下边缘、背面左边缘和背面右边缘。
由于构成光学屏幕1的硬质材料通常具有硬脆性，如果直接在光学屏幕硬质光学屏幕1上打孔或开槽进行固定，容易造成光学屏幕1开裂。为了连接和固定光学屏幕硬质光学屏幕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可以粘接在光学屏幕1上，并和其它贴合方式实现连接，从而完成对光学屏幕1的固定。
连接布2和光学屏幕1之间相互粘接贴合，因而连接布2的伸展程度也会影响到光学屏幕1的卷曲或展开。在本公开的一些实施例中，连接布2的第一连接部与光学屏幕1固定连接可以是光学屏幕1的背面与连接布2的第一连接部相贴合。
在本公开的一些实施例中，连接布2的第一连接部至少与光学屏幕1的背面区域相贴合。为了和光学屏幕1之间实现连接，连接布2具有足够的大小，以至少与光学屏幕1的背面区域相贴合。此时，背面区域均和连接布2的第一连接部贴合。这样当连接布2为平整的伸展状态时，光学屏幕1上的用于投射图像的受光区域也会呈现平整的状态，从而实现较好的画面显示质量。此时，连接布2的第一连接部可以为连接 布与光学屏幕1背面贴合的部分。
由于光学屏幕1在进行画面投影时，通常呈竖直吊挂设置，因而光学屏幕1较易因自身重量而自然下垂，此时，光学屏幕1主要会在左右两侧产生向内卷曲或者向外张的现象。为了让光学屏幕1保持平整，在本公开的一些实施例中，光学屏幕1的背面区域、背面上边缘和背面下边缘均可以与连接布2的第一连接部相贴合。此时，连接布2的第一连接部沿竖直方向横跨整个光学屏幕1，从而可以使光学屏幕1的背面上边缘和背面下边缘均得到连接布2的拉伸，由于光学屏幕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对光学屏幕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，从而使整个光学屏幕1在各个方向上均具有较好的平整度。应当理解的是，本公开中使用的“竖直方向”是指光学屏幕1在进行画面投影时垂直于水平面的方向，“水平方向”是指光学屏幕1在进行画面投影时平行于水平面的方向。
在本发明的这些实施例中，如图13B所示，连接布2的中央部分为其第一连接部211，光学屏幕1可以贴在连接布2的中央位置，而连接布2的第二连接部212，会从光学屏幕1的背面上边缘和背面下边缘向外伸出，以便和其它结构进行连接。应当理解的是，本公开中使用的“向外”是指光学屏幕1在进行画面投影时所在的平面上的远离光学屏幕1的受光区域的方向。
在本公开的另一些实施例中，连接布2的第一连接部与整个光学屏幕1的背面相贴合。也就是说，连接布2的第一连接部与光学屏幕1的背面区域、背面上边缘、背面下边缘、背面左边缘和背面右边缘相贴合。这样整个光学屏幕1均能够与连接布2的第一连接部贴合，从而利用连接布2的伸展而使光学屏幕1实现拉伸和伸展，从而保持较好的平整性。
在本发明的这些实施例中，如图13C所示，连接布2的中央部分为其第一连接部211，光学屏幕1可以贴在连接布2的中央位置，而连接布2的第二连接部212，会从光学屏幕1的背面上边缘、背面下边缘、背面左边缘和背面右边缘向外伸出，以便和其它结构进行连接。
在本公开的另一些实施例中，连接布2的第一连接部仅与光学屏幕1的背面上边缘和背面下边缘相贴合。
在本发明的这些实施例中，如图13A所示，连接布2与光学屏幕1的背面上边缘和背面下边缘相贴合的部分为其第一连接部211，连接布2的第二连接部212会从光学屏幕1的背面上边缘和背面下边缘向外伸出，以便和其它结构进行连接。
在本公开的又一些实施例中，连接布2的第一连接部与光学屏幕1的背面上边缘、背面下边缘、背面左边缘和背面右边缘相贴合，而不与光学屏幕1的背面区域相贴合。
在本发明的这些实施例中，如图13D所示，连接布2与光学屏幕1的背面上边缘、背面下边缘、背面左边缘和背面右边缘相贴合的部分为其第一连接部211，第一连接部211中的对应背面区域的部分为一通孔213，连接布2的第二连接部212会从光学屏幕1的背面上边缘、背面下边缘、背面左边缘和背面右边缘向外伸出，以便和其它结构进行连接。
此外，在本公开的一些实施例中，连接布2的第一连接部与光学屏幕1的背面贴 合，连接布2的第二连接部从光学屏幕1的背面上边缘和背面下边缘，或进一步地，背面左边缘和背面右边缘，弯折到光学屏幕1的正面，以和光学屏幕1的背面上边缘和背面下边缘，或进一步地，背面左边缘和背面右边缘，粘接在一起，然后沿远离光学屏幕1的受光区域的方向从光学屏幕1的背面上边缘和背面下边缘，或进一步地，背面左边缘和背面右边缘伸出。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，投影屏幕中还包括弹性连接件4，弹性连接件4自身具有弹性，因而当弹性连接件4的第一端固定在连接布2的所述第二连接部，而第二端与设置在连接布2的第一连接部远离光学屏幕1的一侧的屏幕框架3连接时，可以凭借自身的弹性将连接布2的第二连接部撑开，迫使连接布2的第二连接部张开为平整的伸展状态。在一些实施例中，为了简化投影屏幕的整体结构，弹性连接件4的弹力方向一般为拉力方向，即当弹性连接件4连接在连接布2的第二连接部和屏幕框架3之间时，弹性连接件4可以将连接布2的第二连接部朝向屏幕框架3的与弹性连接件4的第二端的连接处拉伸，直至连接布2的第二连接部张开至伸展状态。
此时，由于连接布2的第一连接部和光学屏幕1相互粘接并贴合在一起，因而当朝向弹性连接件4的第二端与屏幕框架3的连接处拉伸连接布2的第二连接部时，光学屏幕1也会被向外拉伸，直至光学屏幕1伸展至平整的状态。此时，光学屏幕1可以保证较好的平整性，使投影在光学屏幕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、弹性连接件4以及屏幕框架3对光学屏幕1进行固定，同时通过弹性连接件4的拉伸作用，能够让连接布2的第二连接部呈拉伸状态，进而通过力的传递对光学屏幕1也施加拉伸力，使得硬质光学屏幕1也呈现拉伸展开的状态，利于光学屏幕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。
在本公开的一些实施例中，光学屏幕1是菲涅尔光学屏幕，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光学屏幕1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，光学屏幕1仍无法达到显示所需的平整度要求，光学屏幕1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。
而为了对光学屏幕1实现固定，使用连接布2作为连接结构，连接布2可以具有较小的弹性、可弯折、超薄、致密和高强度等特性，这样连接布2的第一连接部和光学屏幕1贴合时，能够让两者之间形成一体式结构，从而便于实现力的传递，使光学屏幕1能够跟随连接布2的第二连接部的形变而产生拉伸。具体的，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。
在本公开的一些实施例中，连接布2的颜色一般可以为黑色，这样连接布2可以遮盖住光学屏幕1的背面区域，起到遮光和保护光学屏幕1的作用。这是因为光学屏幕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，所以会有部分光透过，这样会造成图像对比度的下降。因此，在光学屏幕1的背面，具体地，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。
在本公开的一些实施例中，在连接光学屏幕1与连接布2的第一连接部时，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光学屏幕1的背面与连接布2的第一连接部贴合在一起，光学屏幕1的背面和连接布2的第一连接部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。在本公开的另一些实施例中，也可以利用尼龙粘扣等形式完成连接。
通常，用于连接光学屏幕1和连接布2的第一连接部的粘合剂具有和光学屏幕1相近或相同的热膨胀系数，或者是具有一定的延展性，这样光学屏幕1因温度变化而产生热胀冷缩时，连接布2会起到一定的缓冲作用，减小光学屏幕1因热胀冷缩变形而对投影画面造成的影响，也有利于维持硬质光学屏幕1的平整度，防止因为两者膨胀系数不同，伸缩率不同，使得光学屏幕1产生应力，而影响平整度。
为了连接和定位连接布2以及光学屏幕1，屏幕框架3一般为框架式结构，包括首尾相接的框架上边缘、框架下边缘、框架左边缘和框架右边缘，以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光学屏幕1，而屏幕框架3可以设置在第一连接部211远离光学屏幕1的一侧，为光学屏幕1提供保护，而屏幕框架3和连接布2的第二连接部之间通过弹性连接件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，以光学屏幕1上侧和下侧的屏幕框架3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具有和上下两侧相似的结构和连接关系，此处不再赘述。
图6示出了本公开的一些实施例提供的投影屏幕的一种局部结构示意图，如图6所示，在利用弹性连接件4实现连接布2和屏幕框架3之间的连接时，连接布2、弹性连接件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。在本公开的一些实施例中，屏幕框架3围合成的面积可以大于连接布2的投影面积，全部或部分屏幕框架3位于连接布2的第二连接部向外远离光学屏幕1的受光区域的外侧。此时，弹性连接件4的第一端即可与连接布2的第二连接部连接，而弹性连接件4的第二端从连接布2的第二连接部向外伸出，并固定在屏幕框架3上，这样即可依靠弹性连接件4将连接布2固定在屏幕框架3的中央，并依靠弹性连接件4的弹力对连接布2的第二连接部进行拉伸，让连接布2保持平整的伸展状态。应当理解的是，本公开中使用的“外侧”是指向外远离光学屏幕1的受光区域的一侧，也即正常使用状态下投影屏幕的上侧、下侧、左侧和右侧中的至少一个。
由于连接布2的第二连接部从屏幕框架的正面绕至屏幕框架的侧面，弹性连接件4的第一端与连接布2的第二连接部连接，而弹性连接件4的第二端固定在屏幕框架3上，连接布2的第二连接部的外侧会包裹部分屏幕框架3，因而投影屏幕的光学屏幕1的远离光学屏幕1的背面区域的外侧需要具有较宽的边框区域以容纳连接布2的第二连接部以及连接布2的第二连接部外侧的连接件4和全部或部分屏幕框架3。为了减小光学屏幕1外侧的边框区域的大小，弹性连接件4可以设置在其它位置，以减小弹 性连接件4和屏幕框架3在投影屏幕的光学屏幕1正面的面积大小。
在本公开的另一些实施例中，如图6所示，屏幕框架3可以包括支撑面，支撑面为屏幕框架3朝向光学屏幕1的一面，屏幕框架1还包括侧面和用于固定弹性连接件4的固定面，固定面是屏幕框架3上远离光学屏幕1的面，侧面是屏幕框架3外侧连接支撑面和固定面的面，连接布2的所述第二连接部沿侧面绕向固定面，并和固定在固定面上的弹性连接件4相连接。
其中，由于连接布2的第一连接部和光学屏幕1的背面贴合，支撑面的面积大于光学屏幕1的投影面积，因而屏幕框架3的支撑面会和连接布2的第一连接部远离光学屏幕1的一面贴合。连接布2和光学屏幕1贴合后，连接布2的第二连接部位于光学屏幕1的背面上边缘、背面下边缘、背面左边缘和背面右边缘外侧，并可继续向外伸出，并沿屏幕框架3的侧面绕向固定面，将屏幕框架3的侧面包裹起来，再和固定在固定面上的弹性连接件4相连接。这样，连接布2的第二连接部等效于裹覆在屏幕框架3的侧面上，而屏幕框架3的侧面则可作为支承点对连接布2的第二连接部进行支撑。此时，屏幕框架3的侧面可以等效为一个定滑轮，使屏幕框架3的支撑面和固定面上的连接布2的第二连接部依靠侧面的支撑而向两个不同的方向运动，当弹性连接件4对固定面上的连接布2的第二连接部施加方向为远离侧面的拉力时，位于支撑面上的连接布2的第二连接部就会被反向拉动，并向靠近侧面的方向移动，从而得到了拉伸和伸展。
在一些实施例中，屏幕框架3的侧面可以是一平面，在一些实施例中屏幕框架3的侧面为一弧面。
由于屏幕框架3的侧面能够改变连接布2的第二连接部所受到的作用力方向，因而弹性连接件4的设置位置不再局限于连接布2的第二连接部外侧，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，弹性连接件4的第一端，也就是与连接布2的第二连接部连接的一端，可以比弹性连接件4的第二端更靠近屏幕框架3的侧面。此时，弹性连接件4可以隐藏在光学屏幕1的背面方向，这样弹性连接件4会被前方的光学屏幕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，光学屏幕1的背面上边缘、背面下边缘、背面左边缘和背面右边缘外侧的区域不再具有弹性连接件4，而仅仅只包括连接布2的第二连接部以及屏幕框架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，在本公开的一些实施例中，由于光学屏幕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。而当光学屏幕1发生热胀冷缩时，如果光学屏幕1的背面上边缘、背面下边缘、背面左边缘和背面右边缘超过了屏幕框架3的侧面，则可能会产生磕碰等现象。为了保证投影的画面质量，屏幕框架3的侧面通常位于屏幕板1的背面上边缘、背面下边缘、背面左边缘和背面右边缘外侧。此时屏幕框架3能够在外界环境改变时，为光学屏幕1提供足够的定位和保护。在上述连接布2的第二连接部的连接方式中，可以让弹性连接件4的拉力方向与光学屏幕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，当弹性连接件4在产生弹性形变时，弹性形变的方向位于光学屏幕所在的平面内，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，当弹性连接件4的拉力方向和光学屏幕1所在的平面平行时，也容易使得光学屏幕1沿着自身所在的平面拉伸延展，确保光学屏幕1始终处于同一平面内，避免由于弹性连接件4的拉力方向不与光学屏幕1所在平面内平行(弹性连接件4的拉力方向和光学屏幕1所在的平面之间具有夹角)，而使光学屏幕1在其它方向上产生扭曲。
而在实现弹性连接件4与屏幕框架3或者连接布2的第二连接部之间的连接时，根据弹性连接件4的类型以及结构的不同，弹性连接件4和连接布2的第二连接部之间，以及弹性连接件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连接件4连接在一起。而由于连接布2为较为柔软的材质所构成，不便于和弹性连接件4直接连接，因而通常还需要在连接布2的第二连接部上固定刚性的连接结构，并利用该连接结构将连接布2的第二连接部和弹性连接件4连接在一起。
在本公开的一些实施例中，所述投影屏幕包括刚性固定件21，刚性固定件21固定在连接布2的第二连接部上，并与弹性连接件4的第一端连接。为了让连接布2的第二连接部和刚性固定件21连接，连接布2的第二连接部的末端可以围成闭合形状，这样刚性固定件21即可被固定在该闭合形状的内部，由此实现了刚性固定件21和连接布2的第二连接部之间的固定。刚性固定件21可以为多种不同的形状和结构，例如可以为直杆状结构，诸如横杆。而相应的，连接布2的第二连接部可以向内卷曲，并与连接布2的第二连接部的内侧缝纫在一起，这样连接布2的第二连接部上就可形成有闭合孔，以供直杆状的刚性固定件21穿设在其中。这样当刚性固定件21在弹性连接件的拉力下移动时，连接布2的第二连接部也会随之移动，并被拉伸为平整的伸展状态。此外，刚性固定件21也可以直接被缝合在连接布2的的第二连接部上。因为连接布2的第二连接部可以通过刚性固定件21与弹性连接件4实现连接，因而依靠刚性固定件21承载作用力，连接布2的第二连接部不易发生撕裂或损坏，并且相比于直接挂接在连接布2，比如孔洞或环上，由于弹性连接件4的数量为有限个，刚性固定件21能够对有限个弹性连接件4的拉伸力在整个刚性固定件21上由施力点向其所在方向上进行匀化，这样拉伸力能够均匀地施加到连接布2的第二连接部上，从而连接布2的第二连接部对于光学屏幕1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。在本公开的一些实施例中，刚性固定件21为刚性棒材结构，可以选择玻璃纤维或者金属材质，不易受力发生变形。
在一些实施例中，可以在连接布2的第二连接部的靠近弹性连接件4的部位设置通孔，并在通孔的内边缘设置金属环，以便于弹性连接件4和连接布2的第二连接部的固定，减缓连接布2在和弹性连接件4的连接位置的磨损。
在本公开的一些实施例中，为了连接刚性固定件21，弹性连接件4一般可以为拉向弹簧，拉向弹簧的第一端可以以吊挂等形式连接在刚性固定件21上，而拉向弹簧的第二端固定在屏幕框架3上。在本公开的一些实施例中，拉向弹簧的与刚性固定件21连接的第一端可以为吊钩或者吊环状，以便和刚性固定件21吊挂连接。此外，弹性连接件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。
图8是本公开的一些实施例提供的投影屏幕中的弹性连接件的一种结构示意图。 如图8所示，为了便于装配，拉向弹簧的侧方还可以设置有可供外物钩挂的拉伸环41。这样操作人员可以通过将手或者其它物体伸入拉伸环41，以对拉向弹簧进行装卸或者拉伸等操作，从而便于实现拉向弹簧与刚性固定件21以及屏幕框架3之间的装配或拆卸操作。
在本公开的一些实施例中，每个刚性固定件21可以与多个弹性连接件4对应连接。例如刚性固定件21为横杆时，每个横杆上可以连接多个弹性连接件4，且多个弹性连接件4间隔分布在横杆上的不同杆段，这样可以有效简化投影屏幕的整体结构。
此外，刚性固定件21也可以与弹性连接件4一一对应连接，该种连接方式通常适用于刚性固定件21为闭合环等外形尺寸较小的结构。
弹性连接件4在为光学屏幕1进行固定和拉伸时，需要有足够的拉伸强度，以保证光学屏幕1得到有效的固定，并具有较好的平整度。弹性连接件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，以弹性连接件4为弹簧为例进行说明，当光学屏幕1为80英寸大小时，光学屏幕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；而当弹簧对光学屏幕1进行固定时，弹簧会拉伸至30mm，即伸长量为7mm。
由于光学屏幕1的面积较大，所以通常需要多个弹性连接件4共同拉伸，才能让光学屏幕1和连接布2有效的展开成平整状态。弹性连接件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连接件4对光学屏幕1提供足够的间接的拉伸力，另一方面，弹性连接件4具有合适的数量，也能避免弹性连接件4数量过大时造成安装困难。一般的，相邻弹性连接件之间的间距在134mm左右时，即可在实现对光学屏幕1固定的同时，保证光学屏幕1具有足够的平整度。
在本公开的一些实施例中，屏幕框架34的框架上边缘、框架下边缘、框架左边缘和框架右边缘处都间隔设置有多个弹性连接件4，比如分别对称方向等间隔设置，这样光学屏幕1的上下左右四个方向均会受到弹性连接件4的拉力作用，因而光学屏幕1在各个方向上均能够得到有效拉伸，保持平整状态。
而由于光学屏幕1自身为硬质光学屏幕，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，而光学屏幕1左右两侧会向内卷曲或者向外张的现象。在本公开的一些实施例中，屏幕框架3的框架上边缘和框架下边缘处都间隔设置有多个弹性连接件4，这样在整个屏幕宽度方向，光学屏幕1都会受到上下的拉伸力，相当于对光学屏幕1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，且由于光学屏幕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。这样能够保证弹性连接件4对光学屏幕1的固定和拉伸，且弹性连接件4数量较少，安装较为方便。
需要说明的是，上述弹性连接件的排布方式，既适用于光学屏幕1的背面区域、背面上边缘和背面下边缘均与连接布2的第一连接部相贴合的情况，也可以适用于连接布2的第一连接部与整个光学屏幕1的背面相贴合的情况。
此外，在本公开的一些实施例中，虽然屏幕框架3的框架上边缘、框架下边缘、 框架左边缘和框架右边缘处都间隔设置有多个弹性连接件4，但设置在框架上边缘和框架下边缘处的弹性连接件4的设置密度小于设置在框架左边缘和框架右边缘处的弹性连接件4的设置密度，这样弹性连接件4仍然环绕在屏幕框架3的四周，但屏幕框架3的框架上边缘和框架下边缘处的弹性连接件4设置较为密集，而框架左边缘和框架右边缘处的弹性连接件4设置较为稀疏，因而光学屏幕1上下两侧受到的拉伸作用力较大，能够有效对抗光学屏幕1向内卷曲或者向外张的应力；而光学屏幕1因自然下垂，发生竖直方向卷曲的应力非常小，因此光学屏幕1左右两侧受到的拉伸作用力较小。这样排布设置的弹性连接件4仍能够结合光学屏幕1不同方向的拉伸需求对光学屏幕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，由于弹性连接件4数量的减少，也给安装带来一定便利。
此时，由于屏幕框架3的框架上边缘、框架下边缘、框架左边缘和框架右边缘处均设置有弹性连接件4，因而该种弹性连接件4的排布方式主要适用于连接布2的第一连接部与整个光学屏幕1背面相贴合的情形。而连接布2的第一连接部与光学屏幕1的背面区域、光学屏幕1的背面上边缘和背面下边缘相贴合的方式，因光学屏幕1的背面左边缘和背面右边缘未与连接布2的第一连接部相贴合，所以不宜将弹性连接件4设置在框架左边缘和框架右边缘处。
为了便于观看，投影屏幕通常需要固定在墙壁等竖直面上。在本公开的一些实施例中，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，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，例如可以利用屏幕固定槽进行挂接或者卡接等。图9是本公开的一些实施例提供的屏幕框架的另一种局部结构示意图。图10是图9中的屏幕框架的安装示意图。如图9至图10所示，在本公开的一些实施例中，屏幕框架3具有屏幕固定槽32，固定槽32至少设置在屏幕框架3的框架上边缘的背面，包括垂直于屏幕框架水平延伸的水平部和在水平部的远离所述屏幕框架的一端竖直延伸的竖直部，屏幕框架、水平部和竖直部共同围合成一侧开口的固定槽32。墙壁上设置有挂架组件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。挂架组件5还可以包括有墙壁固定件52，墙壁固定件52可以通过定位螺栓等固定方式固定在墙壁上的预定位置，而墙壁固定件52上通常可以设置沿竖直方向的移动结构，例如竖直螺栓521等。以墙壁固定件52上设置有螺栓521为例，支撑件51穿设在竖直螺栓521上，且竖直螺栓521的位于支撑件51下方的部位套设有螺母522，螺母522和竖直螺栓521通过螺纹旋合在一起，当螺母522绕竖直螺栓521旋转时，螺母522即可沿着竖直螺栓521的长度方向上下移动，并带动支撑件51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，从而带动屏幕框架3进行高度调整。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，光学屏幕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，有利于减小投影光学屏幕与墙体之间的距离或厚度，同时，光学屏幕的固定和挂墙结构实现一体化，也有利于整个屏幕结构的简化和重量减 轻，利于实现大尺寸的投影显示。
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是本公开的一些实施例提供的支撑件51的结构示意图。如图11所示，在一种实施例中，除了挂接端511，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。该种位置调节方式无需设置其它固定结构对挂架组件5进行固定，所以可以让投影屏幕具有较为紧凑的尺寸和较薄的厚度。
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，在本公开的一些实施例中，支撑件51的挂接端511的形状与屏幕框架3的屏幕固定槽32的形状相匹配。此时，由于屏幕固定槽32一般为矩形，所以支撑件51的挂接端511可以为与屏幕固定槽32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32内，并减少或者消除挂接端511在屏幕固定槽32中的晃动，保证屏幕框架3得到有效固定。
而在本公开的另一些实施例中，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32之后，挂接端511的圆弧状滑动面不会和屏幕固定槽32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32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，在本公开的一些实施例中，光学屏幕1的正面还设置有用于遮盖连接布2的第二连接部的前装饰框(图中未示出)，前装饰框和屏幕框架3连接。这样前装饰框可以设置在屏幕框架3上，并将裸露在光学屏幕1的背面上边缘、背面下边缘、背面左边缘和背面右边缘外侧的连接布2的第二连接部遮盖起来，避免连接布2外露，从而让光学屏幕1的正面上边缘、正面下边缘、正面左边缘和正面右边缘外侧均为前装饰框，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，均为矩形边框结构。
在本公开的一些实施例中，前装饰框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。
在本公开的一些实施例中，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。
在本公开的前述实施例中，投影屏幕包括光学屏幕、柔性连接部、设置在所述柔性连接部远离所述光学屏幕的一侧的屏幕框架以及弹性连接件；所述柔性连接部的第一连接部与所述光学屏幕固定连接；所述柔性连接部的第二连接部与所述弹性连接件的第一端连接，所述弹性连接件的第二端与所述屏幕框架连接，所述弹性连接件被配置为通过所述柔性连接部将所述光学屏幕拉伸至平整状态，实现了光学屏幕与屏幕框架之间的固定和定位，且光学屏幕能够依靠弹性连接件的弹性处于平整的伸展状态， 提高投影画面显示效果。本公开的一些实施例提供的一种投影屏幕，使用框架式的屏幕框架对光学屏幕进行固定，并且利用软质连接材质传递弹性拉伸力实现光学屏幕固定的同时，还对光学屏幕进行了拉伸撑平，上述光学屏幕的固定及拉伸结果一方面减轻了投影屏幕的整体重量，大大降低了材料成本，另一方面更容易实现硬质光学屏幕一致的平整度，且这种实现平整度的方式具有自适应特点，能够更好的适应光学屏幕热胀冷缩的变化，平整度易保持，实用性较高。
本公开的另一些实施例提供了另一种投影屏幕结构，与本公开的前述实施例中不同的是，柔性连接部2与光学屏幕1的连接方式，以及与弹性连接件4的连接方式，在本公开的另一些实施例中，软质的连接布不完全与整个光学屏幕的背面相贴合。在本公开的一些实施例中，柔性连接部2具体为软质的连接布，连接布2的第一连接部与光学屏幕1的背面上边缘、背面下边缘、背面左边缘和背面右边缘中的一个或多个贴合，或者，连接布2的所述第一连接部与光学屏幕1的正面上边缘、正面下边缘、正面左边缘和正面右边缘中的一个或多个贴合，上述两种方式中，连接布2的第二连接部与弹性连接件4连接。在本公开的一些实施例中，通过在连接布2的所述第二连接部设置闭合端容纳刚性棒材，使得弹性连接件4钩挂在刚性棒材上。
在本公开的另一些实施例中，如图12A,图12B和图12C所示，连接布2与光学屏幕1的正面和背面均贴合。上述方式中，连接布2均不与光学屏幕1的整个背面相贴合，仅与光学屏幕1的正面或者背面的边缘贴合。
下面将结合附图12A，图12B图12C，以连接布2的第二连接部与光学屏幕1的正面和背面均贴合的情况进行说明。
连接布2可以同时贴合于光学屏幕1的正面和背面，此时，如图12B和图12C所示，连接布2的第一连接部同时贴合在光学屏幕1的正面与背面，其中贴合在光学屏幕1正面的为第一部分12a，而贴合在光学屏幕1背面的为第二部分12b。第一连接部的第一部分12a与连接布2的第二连接部的第一部分连接，第一连接部的第二部分12b与第二连接部的第二部分连接，第二连接部的第一部分和第二部分可以用于和弹性连接件4等结构连接，且第一连接部的第一部分12a和第二部分12b将光学屏幕的第二连接部夹设在其间，以进行连接布2和光学屏幕1之间的连接固定。在本公开的另一些实施例中，连接布2的第一连接部的第一部分12a和第二部分12b连接成“U”形，该“U”形的封闭端与连接布2的第二连接部连接，连接布2的第二连接部可以用于和弹性连接件4等结构连接，且第一连接部的第一部分12a和第二部分12b将光学屏幕的第二连接部夹设在其间，以进行连接布2和光学屏幕1之间的连接固定。在本公开的一些实施例中，由于位于光学屏幕1下侧边缘区域的连接布2需要承受的作用力较小，因此连接布2的第一连接部可以只与光学屏幕1的一侧贴合，例如贴合在光学屏幕1的背面。
一般的，由于无论是利用粘合剂进行胶粘，还是利用尼龙粘扣等结构连接，光学屏幕1和连接布2的第一连接部之间的连接强度通常都和两者之间的贴合面积成正比。为了保证连接布2的第一连接部和光学屏幕1之间连接的可靠性，通常可以让连接布2的第一连接部同时连接光学屏幕1的正面和背面，从而提高光学屏幕1边缘和连接 布2的第一连接部之间的连接强度。
在本公开的一些实施例中，连接布2的第一连接部与光学屏幕1的正面以及光学屏幕1的背面均贴合时，可以让和光学屏幕1的正面贴合的第一部分12a的面积小于和光学屏幕1的背面贴合的第二部分12b的面积。例如，当连接布2的第一连接部的第一部分12a与光学屏幕1的正面上边缘和/或正面下边缘均贴合，并且连接布2的第一连接部的第二部分12b与光学屏幕1的背面上边缘和/或背面下边缘均贴合时，第一部分12a在水平方向的长度等于光学屏幕1的正面上边缘和/或正面下边缘在水平方向的长度，第一部分12a在竖直方向的宽度为其在竖直方向上沿正面上边缘和/或正面下边缘延伸的长度，第二部分12b在水平方向的长度等于光学屏幕1的背面上边缘和/或背面下边缘在水平方向的长度，第二部分12b在竖直方向的宽度为其在竖直方向上沿背面上边缘和/或背面下边缘延伸的长度。当连接布2的第一连接部的第一部分12a与光学屏幕1的正面左边缘和/或正面右边缘均贴合，并且连接布2的第一连接部的第二部分12b与光学屏幕1的背面左边缘和/或背面右边缘均贴合时，第一部分12a在竖直方向的长度等于光学屏幕1的正面左边缘和/或正面右边缘在竖直方向的长度，第一部分12a在水平方向的宽度为其在水平方向上沿正面左边缘和/或正面右边缘延伸的长度，第二部分12b在竖直方向的长度等于光学屏幕1的背面左边缘和/或背面右边缘在竖直方向的长度，第二部分12b在水平方向的宽度为其在水平方向上沿背面左边缘和/或背面右边缘延伸的长度。这样位于光学屏幕1正面的第一部分12a的面积较小，能够形成较窄的边框宽度；而位于光学屏幕1背面的第二部分12b能够实现较大的连接面积，保证连接布2的第一连接部和光学屏幕1之间的可靠连接。一般的，通常可以让位于光学屏幕1正面的第一部分12a保持10mm左右的宽度，而和光学屏幕1背面贴合的第二部分12b保持50mm左右的宽度。
在本公开的一些实施例中，当连接布2的第一连接部不与光学屏幕1的背面区域相贴合时，投影屏幕还可以包括防护布，防护布与光学屏幕1的背面区域相贴合。这是因为硬质的光学屏幕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，在光学屏幕1的背面，在本公开的一些实施例中，为铝膜的背面，可以利用深色(例如是黑色)的防护布进行遮光，有利于光线不泄露，同时还能防止光学屏幕1背面划伤等，对铝膜和各光学结构层起到保护作用。防护布可以为多种材质，例如由纤维材料、塑料或者本领域技术人员所常用的遮光防护用材料等。
而与本公开的前述实施例相同的是，在图12A、图12B和图12C所示的实施例中，连接布2的第二连接部的第一部分和第二部分，或者，在连接布2的第一连接部的“U”型封闭端与连接布2的第二连接部连接的实施例中，连接布2的第二连接部，沿屏幕框架3的侧面绕向固定面，且连接布2的第二连接部的末端穿设有刚性固定棒材，用于钩挂固定在固定面上的弹性连接件4。此处，刚性固定棒材的选取，使用，均可参见本公开的前述实施例相似，在此不再赘述。
在本公开的一些实施例中，与本公开的前述实施例相似的是，由于屏幕板1的面积较大，所以通常需要多个弹性连接件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。根据软质的连接布和光学屏幕的连接方式，弹性连接件在屏幕框架上的设置也具有不同。当软质的连接布仅设置在光学屏幕1的正面上边缘、正面下边缘、背面上边缘和背面边缘时，则弹性连接件设置于屏幕框架3的框架上边缘、框架下边缘处，用于连接上下两侧的屏幕框架以及光学屏幕的上下侧，当软质的连接布设置于光学屏幕1的四周边缘时，则弹性连接件可分布于光学屏幕或屏幕框架的四周，此时，弹性连接件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连接件4对光学屏幕1提供足够的间接的拉伸力，另一方面，弹性连接件4具有合适的数量，也能避免弹性连接件4数量过大时造成投影屏幕的安装困难。一般的，相邻弹性连接件之间的间距在134mm左右时，即可在实现对光学屏幕1固定的同时，保证光学屏幕1具有足够的平整度。其中，在本公开的一些实施例中，屏幕框架3的框架上边缘、框架下边缘、框架左边缘和框架右边缘处都间隔设置有多个弹性连接件4，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连接件4的拉力作用，因而光学屏幕1在各个方向上均能够得到有效拉伸，保持平整状态。
而由于光学屏幕1自身为硬质光学屏幕，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，而光学屏幕1左右两侧会向内卷曲或者向外张的现象。在本公开的一些实施例中，屏幕框架3的框架上边缘和框架下边缘处都间隔设置有多个弹性连接件4，这样在整个屏幕宽度方向，光学屏幕1都会受到上下的拉伸力，相当于对光学屏幕1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，且由于光学屏幕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。这样能够保证弹性连接件4对光学屏幕1的固定和拉伸，且弹性连接件4数量较少，安装较为方便。
需要说明的是，上述弹性连接件的排布方式，既适用于光学屏幕1的背面上边缘和背面下边缘均与连接布2的第一连接部相贴合的情况，如图13A所示的连接布2，也可以适用于光学屏幕1的背面区域、背面上边缘和背面下边缘均与连接布2的第一连接部相贴合的情况，如图13B所示的连接布2，还可以适用于连接布2的第一连接部与整个光学屏幕1的背面相贴合的情况，如图13C所示的连接布2，甚至还可以适用于连接布2的第一连接部与光学屏幕1的背面上边缘、背面下边缘、背面左边缘和背面右边缘相贴合的情况，如图13D所示的连接布2。
在本公开的一些实施例中，虽然屏幕框架3的框架上边缘、框架下边缘、框架左边缘和框架右边缘处都间隔设置有多个弹性连接件4，但设置在框架上边缘和框架下边缘处的弹性连接件4的设置密度小于设置在框架左边缘和框架右边缘处的弹性连接件4的设置密度。这样弹性连接件4仍然环绕在屏幕框架3的四周，但屏幕框架3的框架上边缘和框架下边缘处的的弹性连接件4设置较为密集，而框架左边缘和框架右边缘处的弹性连接件4设置较为稀疏，因而光学屏幕1上下两侧受到的拉伸作用力较大，能够有效对抗光学屏幕1向内卷曲或者向外张的应力；而光学屏幕1因自然下垂，发生竖直方向卷曲的应力非常小，因此光学屏幕1左右两侧受到的拉伸作用力较小。这样排布设置的弹性连接件4仍能够结合光学屏幕1不同方向的拉伸需求对光学屏幕 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，由于弹性连接件4数量的减少，也给安装带来一定便利。
本公开的另一些实施例提供的另一种投影屏幕结构，通过软质的连接布与光学屏幕进行部分贴合，利用弹性连接件的拉伸力将光学屏幕固定至屏幕框架，实现了光学屏幕固定的同时，还将光学屏幕拉伸至平整状态，使得光学屏幕的平整度较好，提高投影画面的显示质量。
本公开的一些实施例提供了一种投影显示系统，如图14所示。本公开的这些实施例提供的投影显示系统，包括投影装置10和前述实施例中的投影屏幕11，投影装置用于向投影屏幕的光学屏幕投射投影画面，在本公开的一些实施例中，投影装置为激光超短焦投影设备，具有较小的投射比，以较大倾斜角度斜向上将投影光束投射到投影屏幕11上，投影屏幕11为正投影屏幕，将光线反射入人眼形成画面。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中进行了详细说明，此处不再赘述。
在本公开的这些实施例的投影显示系统中，投影屏幕可以包括光学屏幕、柔性连接部、设置在柔性连接部远离光学屏幕的一侧的屏幕框架以及弹性连接件；这样光学屏幕实现了的固定的同时具有较好的平整度，利于提高投影显示质量。
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 (25)

  1. 一种投影屏幕，其特征在于，包括光学屏幕、柔性连接部、设置在所述柔性连接部远离所述光学屏幕的一侧的屏幕框架以及弹性连接件；
    所述柔性连接部的第一连接部与所述光学屏幕固定连接；
    所述柔性连接部的第二连接部与所述弹性连接件的第一端连接，所述弹性连接件的第二端与所述屏幕框架连接，所述弹性连接件被配置为通过所述柔性连接部将所述光学屏幕拉伸至平整状态。
  2. 根据权利要求1所述的投影屏幕，其特征在于，
    所述光学屏幕的正面为投影受光面，所述光学屏幕的背面是指所述光学屏幕上与所述光学屏幕的投影受光面相对的一面；
    所述柔性连接部的所述第一连接部与所述光学屏幕固定连接包括：所述柔性连接部的所述第一连接部与所述光学屏幕的背面贴合。
  3. 根据权利要求2所述的投影屏幕，其特征在于，所述光学屏幕的正面包括受光区域，所述光学屏幕的背面包括与所述受光区域相对的背面区域和设置在所述背面区域外围的背面上边缘、背面下边缘，所述柔性连接部的所述第一连接部与所述光学屏幕的背面贴合包括：所述柔性连接部的所述第一连接部与所述背面上边缘和所述背面下边缘相贴合。
  4. 根据权利要求3所述的投影屏幕，其特征在于，所述光学屏幕的背面还包括设置在所述背面区域外围的背面左边缘和背面右边缘，所述背面上边缘、背面下边缘、背面左边缘和背面右边缘分别设置在所述背面区域四周。
  5. 根据权利要求4所述的投影屏幕，其特征在于，所述柔性连接部的所述第一连接部与所述光学屏幕的背面贴合还包括：所述柔性连接部的所述第一连接部还与所述背面左边缘和所述背面右边缘相贴合。
  6. 根据权利要求3-5中任一项所述的投影屏幕，其特征在于，所述柔性连接部的所述第一连接部与所述光学屏幕的背面贴合还包括：所述柔性连接部的所述第一连接部还与所述背面区域相贴合。
  7. 根据权利要求3-5中任一项所述的投影屏幕，其特征在于，所述投影屏幕还包括防护布，所述防护布与所述背面区域相贴合。
  8. 根据权利要求3-7中任一项所述的投影屏幕，其特征在于，所述柔性连接部的所述第一连接部还与所述光学屏幕的正面贴合。
  9. 根据权利要求8所述的投影屏幕，其特征在于，所述光学屏幕的正面还包括设置在所述受光区域外侧的正面上边缘和正面下边缘，其中，所述正面上边缘与所述背面上边缘相对设置、所述正面下边缘与所述背面下边缘相对设置；
    所述柔性连接部的所述第一连接部包括与所述光学屏幕的正面贴合的第一部分和与所述光学屏幕的背面贴合的第二部分；
    所述柔性连接部的所述第一连接部还与所述光学屏幕的正面贴合包括：所述第一部分与所述正面上边缘和所述正面下边缘相贴合。
  10. 根据权利要求9所述的投影屏幕，其特征在于，所述光学屏幕的正面还包括设置在所述受光区域外侧的正面左边缘和正面右边缘，所述正面上边缘、所述正面下 边缘、所述正面左边缘、所述正面右边缘分别设置在所述受光区域四周。
  11. 根据权利要求10所述的投影屏幕，其特征在于，所述柔性连接部的所述第一连接部还与所述光学屏幕的正面贴合还包括：所述第一部分与所述正面左边缘和所述正面右边缘相贴合。
  12. 根据权利要求8-11中任一项所述的投影屏幕，其特征在于，与所述光学屏幕的正面贴合的所述第一部分的面积小于与所述光学屏幕的背面贴合的所述第二部分的面积。
  13. 根据权利要求1-12中任一项所述的投影屏幕，其特征在于，所述屏幕框架包括框架上边缘、框架下边缘、框架左边缘和框架右边缘；
    所述框架上边缘和所述框架下边缘处都间隔设置有多个所述弹性连接件。
  14. 根据权利要求5或11所述的投影屏幕，其特征在于，所述屏幕框架包括框架上边缘、框架下边缘、框架左边缘和框架右边缘；所述框架上边缘、框架下边缘、框架左边缘和框架右边缘处都间隔设置有多个所述弹性连接件。
  15. 根据权利要求14所述的投影屏幕，其特征在于，设置在所述框架上边缘和框架下边缘处的弹性连接件的设置密度小于设置在所述框架左边缘和框架右边缘处的弹性连接件的设置密度。
  16. 根据权利要求2-15中任一项所述的投影屏幕，其特征在于，所述柔性连接部的所述第一连接部和所述光学屏幕的正面和背面粘接。
  17. 根据权利要求1-16中任一项所述的投影屏幕，其特征在于，所述屏幕框架包括支撑面，所述支撑面为所述屏幕框架朝向所述光学屏幕的一面，所述屏幕框架还包括侧面和用于固定所述弹性连接件的固定面，所述固定面是所述屏幕框架上与所述支撑面相对的面，所述侧面是所述屏幕框架外侧连接所述支撑面和所述固定面的面，所述柔性连接部的所述第二连接部经所述侧面绕向所述固定面，并和固定在所述固定面上的所述弹性连接件的第一端相连接。
  18. 根据权利要求17所述的投影屏幕，其特征在于，所述弹性连接件的所述第一端比所述第二端更靠近所述侧面。
  19. 根据权利要求1-18中任一项所述的投影屏幕，其特征在于，所述投影屏幕包括横杆，所述横杆固定在所述柔性连接部的所述第二连接部上，并与所述弹性连接件的第一端连接。
  20. 根据权利要求1-19中任一项所述的投影屏幕，其特征在于，所述屏幕框架的所述固定面上还设置有用于和设置在墙上的墙体支撑件连接的屏幕固定槽。
  21. 根据权利要求13或14所述的投影屏幕，其特征在于，所述框架上边缘、所述框架下边缘、所述框架左边缘和所述框架右边缘首尾相接。
  22. 根据权利要求1-21中任一项所述的投影屏幕，其特征在于，所述光学屏幕由玻璃或塑料构成。
  23. 根据权利要求1-22中任一项所述的投影屏幕，其特征在于，所述光学屏幕是菲涅尔光学屏幕。
  24. 根据权利要求1-23中任一项所述的投影屏幕，其特征在于，所述柔性连接部为软布。
  25. 一种投影显示系统，其特征在于，包括投影装置和权利要求1-24中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光学屏幕投射投影画面。
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