CN112162458A - Projection screen and projection display system - Google Patents
Projection screen and projection display system Download PDFInfo
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- CN112162458A CN112162458A CN202011212005.2A CN202011212005A CN112162458A CN 112162458 A CN112162458 A CN 112162458A CN 202011212005 A CN202011212005 A CN 202011212005A CN 112162458 A CN112162458 A CN 112162458A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
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Abstract
The invention provides a projection screen and a projection display system, which are used for ultra-short focus orthographic projection display and comprise: the front side of the optical screen is a projection light receiving surface; the first end part of the connecting cloth is attached to at least the back area of the optical screen, the second end part of the connecting cloth extends out of the edge of the optical screen, the second end part of the connecting cloth encloses a closed end, and the closed end contains a rigid fixing piece; the screen frame of cavity rectangle encloses the week side of establishing at optical screen to be located the marginal outside of connecting cloth, the rigidity mounting passes through the connecting piece to be fixed on the screen frame in order to realize that optical screen passes through connecting cloth and stable and atress is fixed in on the screen frame evenly.
Description
The application is based on Chinese invention application 201810225788.4 (2018-3-19), and the invention name is as follows: projection screen and projection display system.
Technical Field
The invention relates to the field of projection display, in particular to a projection screen and a projection display system.
Background
With the continuous development of science and technology, projection display systems are increasingly applied to the work and life of people.
Laser projection has gradually occupied the market because of its advantages of wide color gamut, high brightness, long life, and the like. Currently, the projection screen of a projection display system usually includes different kinds such as a soft screen and a hard screen. The hard screen has good optical gain uniformity, color reducibility and flatness, and has good display effect. Fig. 1 is a schematic structural diagram of an orthographic projection optical screen in the prior art. For an orthographic optical screen, for example, the hard curtain generally includes the optical structure layers shown in fig. 1: a colored layer 101, a diffusing 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 projection image light beam firstly enters and finally exits through the layer, and the colored layer mainly functions to improve the color reduction capability of the projection screen, and sometimes the colored layer 101 can be replaced by a substrate layer; the substrate layer comprises a coloring layer and a hard film layer; the hard film layer mainly plays a role in protecting the diffusion layer 102 and is mainly used for homogenizing uneven incident light and expanding the angle of emergent light; the fresnel lens layer 103 is used to collimate and collimate the incident light beam within a certain angle range, and to disperse the light beam reflected by the reflective layer 104. The reflective layer 104 is usually an aluminum reflective film layer, and is plated on the outer side of the fresnel lens layer 103.
With the increasing size of projection screens (the size of the current mainstream projection screens is usually more than 80 inches), in order to fix the fragile hard screen and ensure the smoothness of the projection screen, a backboard type fixing structure is usually adopted to fix the hard screen. Fig. 2 is a schematic structural diagram of a back-plate type fixing structure in the prior art. As shown in fig. 2, specifically, the backboard type fixing structure includes a decorative frame 201 and a flat back support plate 204, the hard curtain 202 and the back support plate 204 are bonded and fixed by an adhesive 203, and the decorative frame 201 is connected to the back support plate 204, so that the hard curtain 202 is supported and fixed, and thus the rigidity of the back support plate 204 can maintain the flatness of the hard curtain 202, and the hard curtain 202 is prevented from being deformed.
However, adopt monoblock backplate formula fixed knot to construct and fix hard curtain, on the one hand, back support plate's area is great, add man-hour, deformation such as the bulge takes place easily for large-size panel, and simultaneously, the unevenness that the inhomogeneous coating also can cause the laminating when optical screen passes through sticky backplate panel to influence the roughness of monoblock hard curtain, on the other hand, this kind of backplate formula fixed mode also makes the weight of monoblock screen very big, be not convenient for transportation and hang, bring the restriction to the maximization of projection size.
Disclosure of Invention
The invention provides a projection screen and a projection display system, which can fix an optical screen and keep the optical screen in good flatness.
In a first aspect, the present invention provides a projection screen, including a rigid optical screen, a flexible rigid connection portion, a screen frame surrounding the periphery of the optical screen, and a plurality of elastic connection members; the first end part of the soft rigid connecting part is fixedly connected with the optical screen, and the second end part of the soft rigid connecting part extends out of the edge range of the optical screen; the first end of each elastic connecting piece is connected with the second end of the soft rigid connecting part, and the second end of each elastic connecting piece is connected with the screen frame; the soft rigid connecting part transmits the tensile force of the elastic connecting part to enable the optical screen to be stretched to be in a flat state;
further, the first end of the soft rigid connection part is fixedly connected with the optical screen, and the soft rigid connection part specifically comprises: the front surface of the optical screen is a projection light receiving surface, the back surface of the optical screen is attached to the first end part of the soft rigid connecting part, and the first end part of the soft rigid connecting part at least covers the area corresponding to the front light receiving area on the back surface of the optical screen;
and further, the first end of the soft rigid connection part also covers the upper edge area of the optical screen and the lower edge area of the optical screen;
or, the first end of soft rigid connection portion carries out fixed connection with the optical screen, specifically includes: the edge of the optical screen is attached to the first end part of the soft rigid connecting part;
and further, the edge of the front surface and/or the back surface of the optical screen is attached to the first end part of the soft rigid connecting part;
furthermore, a plurality of elastic connecting pieces are arranged at the upper side and the lower side of the optical screen at intervals;
or the elastic connecting pieces are arranged around the optical screen at intervals;
furthermore, the screen frame comprises an outer edge supporting part, the outer edge supporting part is supported on the back of the edge of the optical screen, the edge of the outer edge supporting part is positioned outside the edge range of the optical screen, and the second end part of the soft rigid connecting part extends to the outer side of the outer edge supporting part and then is bent reversely so as to be connected with the elastic connecting part after wrapping the edge of the outer edge supporting part;
furthermore, the second end part of the soft rigid connecting part is provided with at least one rigid fixing part for connecting with the elastic connecting part;
furthermore, the cross section of the screen frame is hollow, and a reinforcing beam or a reinforcing rib is arranged in an inner cavity of the screen frame;
further, the soft rigid connecting part is soft cloth.
In a second aspect, the present invention provides a projection display system, comprising a projection device and a projection screen according to any one of the above technical solutions, wherein the projection device is used for projecting a projection picture onto an optical screen of the projection screen.
According to the projection screen provided by the technical scheme, the first end part of the soft rigid connecting part is fixedly connected with the optical screen, the second end part of the soft rigid connecting part extends out of the edge range of the optical screen and is connected with the elastic connecting part, and the elastic connecting part is connected with the screen frame, so that the soft rigid connecting part transmits the tensile force of the elastic connecting part to stretch the hard optical screen to a flat state, fixing and positioning between the optical screen and the screen frame are realized, meanwhile, the optical screen can be in a flat stretching state without deformation by means of the elasticity of the elastic connecting part, and the display effect of a projection picture is improved.
The projection display system provided by the invention also has the technical effects of light overall weight and good projection screen flatness.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a front projection optical screen of the prior art;
FIG. 2 is a schematic structural diagram of a back-plate type fixing structure in the prior art;
FIG. 3 is a schematic structural diagram of a projection screen according to an embodiment of the present invention;
FIG. 4 is an exploded view of a projection screen according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a projection screen according to an embodiment of the invention;
fig. 6 is a schematic partial structure diagram of a projection screen according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a rear structure of a projection screen according to an embodiment of the invention;
FIG. 8 is a schematic diagram of an elastic connection component of a projection screen according to an embodiment of the present invention;
FIG. 9 is a schematic view of a partial structure of another projection screen according to an embodiment of the present invention;
FIG. 10 is a schematic view of the mounting of the screen frame of FIG. 9;
fig. 11A is a schematic partially exploded view of another projection screen according to a second embodiment of the present invention;
FIG. 11B is a partial assembly view of another projection screen according to a second embodiment of the present invention;
fig. 12 is a schematic structural diagram of a projection display system according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 3, the projection screen provided in this embodiment specifically includes an optical screen 1, a soft rigid connection portion 2, a screen frame 3 surrounding the optical screen 1, and a plurality of elastic connection members 4; wherein, the first end of the soft rigid connecting part 2 is fixedly connected with the optical screen 1, and the second end extends out of the edge range of the optical screen 1; the first end of each elastic connecting piece 4 is connected with the second end of the soft rigid connecting part 2, and the second end is connected with the screen frame 3; the soft rigid connecting part 2 transmits the pulling force of the elastic connecting part 4 to enable the optical screen 1 to be stretched to be in a flat state.
The soft rigid connecting part is made of soft materials, is softer, but has certain rigidity, namely the elastic coefficient is smaller, the deformation is not easy to occur, and the force transmission can be carried out. In one embodiment, the soft rigid connection portion may be a soft cloth, that is, a soft connection cloth, and the soft connection cloth is used as an example in the following description.
Fig. 5 is a side view showing a structure of a projection screen according to the present embodiment. Fig. 4 is an exploded schematic diagram of a projection screen structure according to this embodiment.
The optical screen 1 of the projection screen is usually made of hard material and has a certain rigidity and strength, so that when the optical screen 1 is stretched, a relatively flat surface can be formed. In this way, at least a partial area of the front surface of the optical screen 1 can be used as a light receiving area for projecting an image so as to project a picture and an image on the front surface of the optical screen 1 for display.
Since the hard material constituting the optical screen 1 generally has hard brittleness, if the optical screen 1 is directly fixed by punching or grooving on the hard optical screen 1, the optical screen 1 is easily cracked. In order to connect and fix the optical screen hard optical screen 1, the projection screen in this embodiment further includes a soft connecting cloth 2, and the connecting cloth 2 can be adhered to the optical screen hard optical screen 1 and connected with other fixing structures, thereby completing the fixing of the optical screen 1.
The first end of the soft rigid connector 2 is fixedly connected to the optical screen 1, and specifically, the back surface of the optical screen 1 may be bonded to the first end of the soft rigid connector 2, wherein the first end of the soft rigid connector 2 covers at least a region corresponding to the front light-receiving region on the back surface of the optical screen 2. In order to achieve the connection with the optical screen 1, the connecting cloth 2 has a sufficient size to cover at least an area of the rear surface of the optical screen 1 opposite to the front light-receiving area. Thus, when the connecting cloth 2 is in a flat and stretched state, the light receiving area for projecting an image on the optical screen 1 is also stretched, thereby realizing a better projection image. In this case, the first end of the soft rigid connection portion 2 may be specifically a portion where the connection cloth is attached to the back surface of the optical screen.
Because the optical screen 1 is usually vertically suspended during image projection, the optical screen 1 is hard and is easy to naturally droop due to its own weight, and at the moment, the optical screen 1 mainly generates inward curling or outward expansion on the left and right sides. In order to keep the optical screen 1 flat, optionally, the area of the back surface of the optical screen 1 corresponding to the front light-receiving area, the upper edge area of the optical screen, and the lower edge area of the optical screen may be covered with the connecting cloth 2. At this moment, connect cloth 2 and span whole optical screen 1 along vertical direction to the top edge region that can make optical screen 1 and lower fringe region all obtain the tensile of connecting cloth 2, because optical screen 1 is greater than the ascending width in vertical direction at the ascending width in horizontal direction usually, therefore utilize and connect cloth 2 to strengthen fixedly on optical screen 1 both sides from top to bottom, both sides take place inside curl or flare-out about not only can avoiding from top to bottom, also can restrain the curling phenomenon of the left and right sides simultaneously, thereby make whole optical screen 1 all have better roughness in all directions.
In yet another alternative, the connecting cloth 2 covers the entire back of the optical screen 1. Therefore, the whole optical screen hard optical screen 1 can be attached to the soft connecting cloth 2, and the hard optical screen 1 is stretched and stretched by stretching the connecting cloth, so that the good flatness is kept.
In both of the above-mentioned manners, the optical screen 1 may be attached to the center of the connection cloth 2, and the edge of the connection cloth 2, i.e., the second end portion, may protrude outside the edge of the optical screen 1 so as to be connected to other structures.
In addition, when the joint cloth 2 is jointed with the optical screen 1, the joint cloth 2 may be bent from the edge of the optical screen 1 to the front side of the optical screen 1 after being jointed with the back side of the optical screen 1, and then be bonded with the edge part of the front side of the optical screen 1, and finally extend to the outer side of the edge of the optical screen 1 in a reverse direction.
Since the connecting cloth 2 is made of soft material, in order to keep the connecting cloth 2 in a stretching state, the projection screen further comprises a plurality of elastic connecting pieces 4, and the elastic connecting pieces 4 have elasticity, so that when one end of each elastic connecting piece 4 is fixed on the edge of the connecting cloth 2 and the other end of each elastic connecting piece is connected with the screen frame 3 surrounding the optical screen 1, the connecting cloth 2 can be stretched out by the elasticity of the elastic connecting piece 4, and the connecting cloth 2 is forced to be stretched into a flat stretching state. Generally, in order to simplify the overall structure of the projection screen, the elastic direction of the elastic connection member 4 is generally a tensile direction, that is, when the elastic connection member 4 is connected between the connection cloth 2 and the screen frame 3, the elastic connection member 4 can stretch the connection cloth 2 toward the screen frame 3 at the outer side until the connection cloth 2 is stretched to a stretched state.
At this time, since the connecting cloth 2 and the optical screen 1 are adhered and attached to each other, when the connecting cloth 2 is extended outward, the optical screen 1 is also stretched outward until the optical screen 1 is extended to a flat state. At this moment, the optical screen 1 can ensure better smoothness, so that the picture and the image projected on the front surface of the optical screen 1 have better display effect, and the projected picture is prevented from being inclined and deformed.
Like this, projection screen in this embodiment can fix optical screen 1 through connecting cloth 2, elastic connecting piece 4 and screen frame 3, and the tensile effect through elastic connecting piece 4 in the outside simultaneously can let connecting cloth 2 be tensile state, and then also exerts the tensile force to optical screen 1 through the transmission of force for stereoplasm optical screen 1 also presents the state of tensile expansion, does benefit to optical screen stereoplasm optical screen 1 and realizes the planarization.
The detailed structure and operation principle of the projection screen in this embodiment will be further described in detail below.
Optionally, the optical screen hard optical screen 1 may generally be composed of a hard layer, a fresnel structure layer, a projection layer, etc., and has certain strength and rigidity, and can have certain perpendicularity in a vertical free-sagging state to make the optical screen look flat, but still has certain softness, if there is no support or external interference, the optical screen hard optical screen still cannot meet the flatness requirement required by display, and the screen is not flat, so that the laser projection image is deformed, blurred, uneven in brightness, or has other deterioration problems.
In order to fix the optical screen hard optical screen 1, the connecting cloth 2 is used as a connecting structure, and the connecting cloth 2 generally has the characteristics of inelasticity, ultrathin property, compactness, high strength and the like, so that when the connecting cloth 2 is attached to the optical screen 1, an integrated structure can be formed between the connecting cloth 2 and the optical screen 1, force transmission is facilitated, and the optical screen 1 can stretch along with the deformation of the connecting cloth 2. Specifically, the connecting cloth 2 may be a soft cloth. Therefore, the connecting cloth 2 can better transmit acting force when being stretched, has more stable property, can adapt to wider environment, and can keep better flatness and reliability at the environment temperature of between 10 ℃ below zero and 40 ℃ below zero.
Alternatively, the color of the connecting cloth 2 may be black, so that the connecting cloth 2 can cover the area opposite to the light receiving area on the back of the optical screen 1, thereby shielding the light and protecting the optical screen 1. This is because the optical screen hard optical screen 1 is an optical structure layer and has a certain light transmittance, and particularly when used as a front projection screen, the innermost layer is a reflective layer, and the active surface of the reflective layer reflects projection light (for example, an aluminum-plated film), but since the reflectivity of 100% cannot be achieved, all light is partially transmitted, which may cause a decrease in image contrast. Therefore, the back of the optical screen 1, specifically, the back of the aluminum film, is shielded by using the black connecting cloth, so that light is prevented from leaking, and meanwhile, the back of the screen can be prevented from being scratched, and the aluminum film and each optical structure layer are protected.
Alternatively, when the optical screen 1 and the connecting cloth 2 are connected, the connection and fixation between the two are usually realized by using an adhesive, i.e. gluing. Thus, the back surface of the optical screen 1 is attached to the connecting cloth 2 by gluing, and no space or gap is left between the back surface of the optical screen 1 and the connecting cloth 2, so that the display of a projection picture is not influenced by the air flow (especially the air flow brought by the temperature change) in the gap between the back surface of the optical screen 1 and the connecting cloth 2.
Generally, the adhesive used for connecting the optical screen 1 and the connecting cloth 2 generally has a thermal expansion coefficient similar to or the same as that of the optical screen 1, or has a certain ductility, so that when the optical screen 1 expands with heat and contracts with cold due to temperature changes, the adhesive 2 can play a certain role of buffering, the influence of the optical screen 1 on a projection picture due to thermal expansion and contraction with cold deformation is reduced, the flatness of the hard optical screen 1 is also favorably maintained, and the optical screen 1 is prevented from generating stress and influencing the flatness due to different expansion coefficients and different expansion rates of the two.
In order to connect and position the connecting cloth 2 and the optical screen 1, the screen frame 3 is generally in a frame structure, the screen frame 3 defines a rectangular or square hollow region for receiving the optical screen 1, the screen frame 3 surrounds the edge of the optical screen 1 to protect the optical screen 1, the screen frame 3 and the connecting cloth 2 are connected by the elastic connecting member 4, the specific structure and connection relationship of the screen frame 3 are shown in fig. 3 to 7, wherein for convenience of description, the screen frame on the upper side and the lower side of the optical screen 1 is taken as an example. It is understood that the structures of the left and right sides of the screen frame 3 also have similar structures and connection relationships to those of the upper and lower sides, and are not described in detail herein.
Specifically, fig. 6 shows a schematic view of a partially enlarged structure of a projection screen, and as shown in fig. 6, when the connection between the connection cloth 2 and the screen frame 3 is implemented by using the elastic connection members 4, there may be a plurality of different structures and relative positions between the connection cloth 2, the elastic connection members 4, and the screen frame 3. As one of alternative embodiments, the size of the screen frame 3 may be larger than the size of the connection cloth 2, and thus the screen frame 3 is located outside the edge of the connection cloth 2. At this moment, the one end of the elastic connecting piece 4 can be connected at the edge of the connecting cloth 2, and the other end of the elastic connecting piece 4 extends outwards from the edge of the connecting cloth 2 and is fixed on the screen frame 3 positioned outside the connecting cloth 2, so that the connecting cloth 2 can be fixed at the center of the screen frame 3 by the elastic connecting piece 4, the connecting cloth 2 is stretched by the elasticity of the elastic connecting piece 4, and the connecting cloth 2 is kept in a flat stretching state.
Since the screen frame 3 is disposed outside the edge of the connection cloth 2 and the elastic connection member 4 is disposed outside the edge of the connection cloth 2, the elastic connection member 4 and the screen frame 3 are included outside the connection cloth 2, and thus the outside of the optical screen 1 of the projection screen has a wider frame area. In order to reduce the size of the frame area outside the optical screen 1, the elastic connection member 4 may be disposed at other positions so as to reduce the size of the area of the elastic connection member 4 and the screen frame 3 on the front surface of the optical screen 1 of the projection screen.
As another alternative embodiment, the screen frame 3 may include an outer edge support portion 31, the outer edge support portion 31 is supported on the back of the edge of the optical screen 1, the edge of the outer edge support portion 31 is located outside the edge range of the optical screen 1, and the edge of the connection cloth 2 is bent in the opposite direction after extending to the outside of the outer edge support portion 31 to be connected with the elastic connection member 4 after wrapping the edge of the outer edge support portion 31.
Since the connecting cloth 2 is attached to the back surface of the optical screen 1, the outer edge support portion 31 is attached to the surface of the connecting cloth 2 away from the optical screen 1 and abuts against and supports the back surface of the edge of the optical screen 1. Since the screen frame 3 is generally of a hard structure, the outer edge support portion 31 can achieve good contact support with the back surface of the optical screen 1 by the soft connecting cloth 2. Meanwhile, the outer edge support 31 is located at the outer edge of the screen frame 3, that is, the outermost region of the screen frame 3. After the connecting cloth 2 is attached to the optical screen 1, the edge of the connecting cloth 2 is located outside the edge of the optical screen 1 and can continuously extend outwards, and the connecting cloth wraps the edge of the outer edge supporting part 31 from the outer side of the outer edge supporting part 31 to the rear area of the screen frame 3 and is connected with the elastic connecting piece 4. Thus, the connecting cloth 2 is equivalent to being hung on the edge of the outer edge support 31, and the edge of the outer edge support 31 can serve as a supporting point for supporting the connecting cloth 2. At this time, the edge of the outer edge support portion 31 may be equivalent to a fixed pulley, so that the connection cloths 2 at both sides of the edge of the outer edge support portion 31 move in two different directions by the support of the outer edge support portion 31, and when the elastic connection member 4 applies a pulling force in a direction away from the edge of the outer edge support portion 31 to the connection cloths 2 at the back of the edge of the outer edge support portion 31, the connection cloths 2 at the front of the edge of the outer edge support portion 31 are pulled in a reverse direction and move in a direction close to the edge of the outer edge support portion 31, thereby being stretched and extended.
Since the outer edge support portion 31 can change the direction of the force applied to the connecting cloth 2, the position of the elastic connecting member 4 is not limited to the outside of the edge of the connecting cloth 2, but can be set within the coverage of the connecting cloth 2 when it is stretched. Alternatively, the first end of the elastic link 4, i.e., the end connected to the edge of the connection cloth 2, may be positioned outside the second end of the elastic link 4. At this time, 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 hidden by the front optical screen 1 and the connecting cloth 2 and is difficult to see from the front of the projection screen. In such a setting mode, the area outside the edge of the optical screen 1 is not provided with the elastic connecting piece 4 any more, but only comprises the connecting cloth 2 and the screen frame 3, so that the formed frame area has a smaller width, and the appearance display effect of the projection screen can be effectively improved.
In addition, the cross section of the screen frame 3 may be a hollow shape, such as a hollow rectangle, and since the cross section of the screen frame 3 is hollow, a reinforcing beam or a reinforcing rib may be provided in an inner cavity of the cross section to improve the overall structural strength of the screen frame 3.
In the above-mentioned connection manner of the edge of the connection cloth 2, the pulling direction of the elastic connection member 4 can be kept parallel or nearly parallel to the plane of the optical screen 1. This can provide two benefits: on one hand, the overall volume and thickness of the projection screen can be reduced, and when the elastic connecting piece 4 generates elastic deformation, the direction of the elastic deformation is positioned in the plane of the optical screen or has a smaller included angle with the plane, so that the deformation in the thickness direction of the projection screen is smaller, and the thickness of the projection screen can be effectively reduced; on the other hand, when the tensile direction of the elastic connecting piece 4 is parallel to the plane of the optical screen 1, the optical screen 1 is easily stretched and extended along the plane of the optical screen 1, so that the optical screen 1 is always in the same plane, and the tensile direction of the elastic connecting piece 4 is parallel to the plane of the optical screen, so that the optical screen 1 is not easily twisted in other directions.
When the connection between the elastic connection member 4 and the screen frame 3 or the connection cloth 2 is implemented, there are various connection modes between the elastic connection member 4 and the connection cloth 2 and between the elastic connection member 4 and the screen frame 3 according to the type and structure of the elastic connection member 4. The screen frame 3 is a rigid body, and can be connected with the elastic connecting piece 4 by common fixing methods such as clamping, threaded fastener connection or riveting. However, since the connecting cloth 2 is made of a soft material, it is inconvenient to directly connect with the elastic connecting member 4, and therefore, a rigid connecting structure is usually fixed on the connecting cloth 2, and the connecting cloth 2 and the elastic connecting member 4 are connected together by using the rigid connecting structure.
As an alternative connection, the edge, i.e. the second end, of the connecting cloth 2 is provided with at least one rigid fixing element 21 for connection with the elastic connecting element 4. In order to connect the connection cloth 2 and the rigid fixing member 21, the edges of the connection cloth 2 may enclose a closed shape, so that the rigid fixing member 21 may be fixed inside the closed shape, thereby achieving the fixation between the rigid fixing member 21 and the connection cloth 2. The rigid mount 21 may be of many different shapes and configurations, such as a straight rod-like configuration. Accordingly, the edge of the cloth 2 can be curled inward and sewn with the inner side of the cloth 2, so that the edge of the cloth 2 can be formed with a closed hole for the straight bar-shaped rigid fixing member 21 to be inserted therethrough. Thus, when the rigid fixing member 21 is moved by the tension of the elastic connecting member, the connecting cloth 2 is moved and stretched in a flat stretched state. Further, the rigid fixing member 21 may be directly sewn to the edge of the connecting cloth 2. Because the connecting cloth 2 can be connected with the elastic connecting pieces 4 through the rigid fixing pieces 21, the connecting cloth can bear acting force by means of the rigid fixing pieces, the edge of the connecting cloth 2 is not easy to tear or damage, and compared with the connecting cloth directly hung on holes or rings, the connecting cloth has the advantages that the number of the elastic connecting pieces is limited, the stretching force of the limited elastic connecting pieces can be homogenized in the direction of the rigid fixing pieces from force application points through the rigid fixing pieces, the stretching force can be uniformly applied to the connecting cloth, and the stretching force of the connecting cloth to the hard optical screen is uniform everywhere, so that the uniform flatness is more favorably realized. In specific implementation, the rigid fixing member 1 is a rigid bar structure, and may be made of glass fiber or metal, and is not easily deformed by force.
Alternatively, in order to connect the rigid fixing member 21, the elastic connecting member 4 may be a pull spring, one end of the pull spring may be connected to the rigid fixing member 21 in a hanging manner, and the other end of the pull spring may be fixed to the screen frame 3. Specifically, the end of the pull spring connected to the rigid fixing member 21 may be a hook or a hanging ring, so as to be connected to the rigid fixing member 21 in a hanging manner. In addition, the elastic connecting member 4 may also be an elastic connecting structure commonly used by those skilled in the art, such as a rubber body, and will not be described herein again.
Fig. 8 is a schematic structural diagram of an elastic connection component in a projection screen according to an embodiment of the present invention. As shown in fig. 8, a tension ring 41 for hooking a foreign object may be further provided to a side of the spring for easy assembly. Thus, the operator can insert hands or other objects into the tension ring 41 to assemble or disassemble the tension spring, thereby facilitating the assembling or disassembling operation between the tension spring and the rigid fixing member 21 and the screen frame 3.
Alternatively, each rigid fixing member 21 may be connected with a plurality of elastic connection members 4 correspondingly. For example, when the rigid fixing member 21 is a straight rod, each straight rod may be connected to a plurality of elastic connecting members, and the plurality of elastic connecting members are distributed at intervals on different rod sections of the straight rod, so as to effectively simplify the overall structure of the projection screen.
In addition, the rigid fixing members 21 can be connected with the elastic connecting members 4 in a one-to-one correspondence manner, and the connection manner is generally applicable to structures with small external dimensions, such as closed rings, of the rigid fixing members 21.
The elastic connecting member 4 needs to have sufficient tensile strength when fixing and stretching the optical screen 1, so as to ensure that the optical screen 1 is effectively fixed and has good flatness. The elastic connecting piece 4 needs to be made of an elastic material capable of adapting to the cold and heat changes of the environment and can adapt to the changes of the environment temperature or the force, the elastic connecting piece 4 is taken as a spring for illustration, when the optical screen 1 is 80 inches in size, the weight of the optical screen 1 is usually 5 kilograms (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, and the free height is about 23 mm; when the spring is used for fixing the optical screen 1, the spring is stretched to 30mm, namely, the stretching amount is 7 mm.
Due to the large area of the optical screen 1, a plurality of elastic connecting members 4 are usually required to be stretched together to effectively unfold the optical screen 1 and the connecting cloth 2 into a flat state. The elastic connecting pieces 4 can be arranged at intervals and have proper arrangement density. Therefore, on one hand, a plurality of elastic connecting pieces 4 can be used for providing enough indirect tensile force for the optical screen 1, and on the other hand, the elastic connecting pieces 4 are provided with proper quantity, and the difficulty in installation caused by the overlarge quantity of the elastic connecting pieces 4 can be avoided. Generally, when the distance between adjacent elastic connecting pieces is about 134mm, the optical screen 1 can be fixed, and meanwhile, the optical screen 1 is ensured to have enough flatness.
As an optional arrangement manner of the elastic connection members 4, the elastic connection members 4 may be disposed around the optical screen 1 at intervals, for example, in equal intervals in symmetrical directions. Therefore, the optical screen 1 can be effectively stretched in all directions and kept in a flat state under the action of the tensile force of the elastic connecting piece 4 in all directions.
Because the optical screen 1 is a hard optical screen, when the optical screen is vertically hung, natural sagging is easy to occur due to self weight, and the left side and the right side of the optical screen 1 can be curled inwards or outwards. Therefore, as another optional arrangement, the plurality of elastic connecting members 4 may be disposed at intervals on the upper and lower sides of the optical screen 1, so that in the entire screen width direction, the optical screen rigid optical screen 1 may receive upper and lower stretching forces, which is equivalent to strengthening and fixing the upper and lower sides of the screen, and the upper and lower sides are fixed in the width direction, thereby preventing the upper and lower sides from curling inwards or outwards due to insufficient fixing force, and since the width of the optical screen 1 in the horizontal direction is generally greater than the width in the vertical direction, the curling phenomenon on the left and right sides can be simultaneously suppressed. Can guarantee like this that elastic connection spare 4 is fixed and tensile to optical screen, and elastic connection spare 4 quantity is less, and the installation is comparatively convenient.
It should be noted that the arrangement manner of the elastic connecting pieces is not only suitable for the case that the area corresponding to the front light receiving area on the back of the optical screen 1, the upper edge area of the optical screen 1 and the lower edge area of the optical screen are covered with the connecting cloth, but also suitable for the case that the connecting cloth 2 covers the whole back of the optical screen 1.
In addition, as another optional arrangement, the elastic connection members 4 are still disposed around the optical screen 1, and the arrangement density of the elastic connection members located on the left and right sides of the optical screen 1 is smaller than that of the elastic connection members located on the upper and lower sides of the optical screen. Therefore, the elastic connecting pieces 4 still surround the optical screen 1, but the elastic connecting pieces on the upper side and the lower side of the optical screen 4 are arranged more densely, and the elastic connecting pieces on the left side and the right side are arranged more sparsely, so that the tensile acting force on the upper side and the lower side of the optical screen 1 is larger, and the stress of inward curling or outward stretching of the optical screen 1 can be effectively resisted; the optical screen 1 is naturally sagged, and the stress of curling in the vertical direction is very small, so that the left side and the right side of the optical screen are provided with small stretching acting force. The elastic connecting piece 4 arranged like this can still apply appropriate stretching force to all directions of the optical screen 1 in combination with stretching requirements of the optical screen 1 in different directions, so that better stretching and fixing effects are achieved, and certain convenience is brought to installation due to the reduction of the number of the elastic connecting pieces.
At this time, since the upper and lower sides and the left and right sides of the optical screen 1 are provided with the elastic connection members 4, the arrangement of the elastic connection members is mainly suitable for the case where the connection cloth 2 covers the back of the entire optical screen 1. In the case where the connection cloth 2 covers the area corresponding to the front light receiving area on the rear surface of the optical screen 1, the upper edge area of the optical screen 1, and the lower edge area of the optical screen 1, the elastic connection members 4 are not preferably provided because the connection cloth 2 is not covered at the left and right edges of the optical screen 1.
For viewing purposes, projection screens are typically mounted on a vertical surface such as a wall. As an alternative embodiment, in order to fix the projection screen, 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 wall support or other fixing structures through the screen fixing groove, and can be specifically hooked or clamped by using the screen fixing groove. Fig. 9 is a schematic partial structure diagram of another screen frame according to an embodiment of the present invention. Fig. 10 is a schematic view of the installation of the screen frame of fig. 9. As shown in fig. 3 to 10, alternatively, since the screen frame 3 has the screen fixing groove 32, it is possible to serve as a wall support by providing the hanger assembly 5 on the wall; wherein the hanger assembly 5 includes a support 51, the support 51 having a hanging end 511 for inserting into the screen fixing groove 32 and supporting the screen frame 3, the support 51 having a variable position in a vertical direction with respect to the wall. The screen frame 3 of the projection screen can thus be hung on the hanger assembly 5 to achieve a relative fixation between the projection screen and the wall.
Therefore, for the projection screen, the fixing structure of the optical screen is also used as a wall hanging structure of the whole projection screen, the structure of the projection screen can be simplified, the reduction of the distance or the thickness between the projection optical screen and a wall body is facilitated, meanwhile, the fixation of the optical screen and the wall hanging structure are integrated, the simplification and the weight reduction of the structure of the whole screen are facilitated, and the realization of large-size projection display is facilitated.
Specifically, the hanger assembly 5 includes a support 51 therein, and the support 51 is movable in a vertical direction with respect to the wall to change the height of the support 51 with respect to the ground. At this time, the height of the screen frame 3 supported by the support 51 may be adjusted accordingly.
Wherein, the supporting member 51 may have a plurality of different position adjusting manners according to different structures of the hanger assembly 5.
In yet another alternative, the rack assembly 5 may further include a wall fixing member 52, the wall fixing member 52 may be fixed at a predetermined position on the wall by a fixing method such as a positioning bolt, and the wall fixing member 52 may be provided with a moving structure in a vertical direction, such as a vertical bolt 521. Use being provided with bolt 521 on the wall mounting 52 as an example, support piece 51 wears to establish on vertical bolt 521, and the position cover that is located support piece 51 below of vertical bolt 521 is equipped with nut 522, and nut 522 and vertical bolt 521 pass through the screw thread and revolve together, and when nut 522 was rotatory around vertical bolt 521, nut 522 could reciprocate along vertical bolt 521's length direction to drive support piece 51 and remove along vertical direction, thereby drive screen frame 3 and carry out height control.
The body of the support 51 may also have a variety of different shapes or configurations for supporting and hanging the screen frame 3. For example, alternatively, the shape of the hanging end 511 of the support member 51 matches the shape of the screen fixing groove 31 of the screen frame 3. At this time, since the screen fixing groove 31 is generally rectangular, the hanging end 511 of the support member 51 may be rectangular to match the shape of the screen fixing groove 31. The rectangular hanging end 511 has a certain thickness, can be clamped in the screen fixing groove 31, and can reduce or eliminate the shaking of the hanging end 511 in the screen fixing groove 31, thereby ensuring that the screen frame 3 is effectively fixed.
In addition, in order to improve the aesthetic appearance of the projection screen, optionally, the front surface of the optical screen 1 is further provided with a front decorative frame (not shown in the figure) for covering the edge of the connecting cloth, and the front decorative frame is connected with the screen frame 3. The front decorative frame can be arranged on the screen frame 3, the connecting cloth 2 exposed outside the edge of the optical screen 1 is covered, the connecting cloth 2 is prevented from being exposed, the front outer side of the optical screen 1 is the front decorative frame, and the front attractiveness of the projection screen is effectively improved. Generally, the front decorative frame and the screen frame 3 are similar in structure and both have a rectangular frame structure.
Optionally, the surface of the front decorative frame may be treated by a surface treatment process such as electroplating, wire drawing or paint spraying, so as to further improve the aesthetic property of the front decorative frame.
Alternatively, the front decorative frame and the screen frame 3 may be connected by a clamping, bonding or threaded fastener, which is commonly used by those skilled in the art.
In this embodiment, the projection screen specifically includes an optical screen hard optical screen, a soft connecting cloth, a screen frame surrounding the optical screen, and a plurality of elastic connecting pieces; the front side of the optical screen is a projection light receiving surface, the back side of the optical screen is attached to a connecting cloth, the connecting cloth covers the area of the back side of the optical screen opposite to a front light receiving area or covers the back side of the whole optical screen, the part of the connecting cloth positioned in the edge range of the optical screen is connected with the first ends of a plurality of elastic connecting pieces, the second end of each elastic connecting piece is connected with the screen frame, the first end of the connecting cloth is fixedly connected with the optical screen, the second end, namely the edge part, of the connecting cloth extends out of the edge range of the optical screen and is connected with the elastic connecting pieces, and the elastic connecting pieces are connected with the screen frame, so that the soft connecting cloth transmits the tensile force of the elastic connecting pieces to enable the hard optical screen to be stretched to be in a flat state, fixing and positioning between the optical screen and the screen frame are realized, and the optical screen can, and the display effect of the projection picture is improved. Compared with the traditional covering type back plate fixing structure, the embodiment of the invention firstly provides the projection screen, the frame type screen frame is used for fixing the optical screen, the soft connecting material is used for transmitting elastic tensile force to realize the fixation of the hard optical screen, and meanwhile, the optical screen is stretched and flattened.
Example two
The second embodiment of the present invention provides another projection screen structure, which is different from the first embodiment in the connection manner between the soft rigid connection portion and the optical screen and the connection manner between the soft rigid connection portion and the elastic connection portion. Specifically, in one embodiment, the soft rigid connection portion is specifically a soft connection cloth, the first end of the soft rigid connection portion is a first edge of the soft connection cloth, and the second end of the soft connection cloth is a second edge of the soft connection cloth, specifically, the first edge of the soft connection cloth is attached to an edge of the back surface of the optical screen, or the first edge of the soft connection cloth is attached to an edge of the front surface of the optical screen.
Alternatively, as shown in fig. 11A and 11B, the soft connecting cloth is attached to both the front and back surfaces of the optical screen. In the above manner, the soft connecting cloth does not cover the entire back surface of the optical screen, and is only attached to the edge region of the front surface or the back surface of the optical screen.
The following description will be made with reference to fig. 11A and 11B, in which the soft connecting cloth is attached to both the front and back surfaces of the optical screen.
The soft connecting cloth 2 can be attached to the front and back of the optical screen 1 at the same time, at this time, the connecting cloth 2 is in a 'U' shape, the closed end of the 'U' shape is a second end part located outside the edge of the optical screen 1 and can be used for being connected with structures such as an elastic connecting piece 4, and the two layers of connecting cloth forming the opening of the 'U' shape clamp the edge of the optical screen therein so as to connect and fix the connecting cloth 2 and the optical screen 1. The connecting cloth positioned in the upper side edge area of the optical screen 1 is simultaneously attached to the front surface and the back surface of the optical screen 1, wherein the connecting cloth 2a is attached to the front surface of the optical screen 1, and the connecting cloth 2b is attached to the back surface of the optical screen 1; the connecting cloth located at the lower edge region of the optical screen 1 needs to bear a small force, and can be attached to only one side of the optical screen 1, for example, to the back of the optical screen 1.
Generally, the strength of the connection between the optical screen 1 and the connection cloth 2 is generally proportional to the area of adhesion between the two, whether the connection is made by an adhesive or by a structure such as a nylon hook and loop fastener. In order to ensure the reliability of the connection between the connection cloth 2 and the optical screen 1, it is generally possible to allow the connection cloth 2 to simultaneously connect the front and back surfaces of the optical screen 1, thereby improving the connection strength between the edge of the optical screen 1 and the connection cloth 2.
Further, when the connection cloth 2 is attached to both the front surface of the optical screen 1 and the back surface of the optical screen 1, the width of the connection cloth 2a attached to the front surface of the optical screen 1 may be made smaller than the width of the connection cloth 2b attached to the back surface of the optical screen 1. Thus, the width of the connecting cloth 2a positioned on the front surface of the optical screen 1 is smaller, and a narrower frame width can be formed; the connecting cloth 2b on the back of the optical screen 1 can realize a larger connecting area, and the reliable connection between the connecting cloth 2 and the optical screen 1 is ensured. In general, the width of the connecting cloth 2a on the front surface of the optical screen 1 is generally about 10mm, and the width of the connecting cloth 2b attached to the rear surface of the optical screen 1 is generally about 50 mm.
Optionally, the projection screen may further include a protective cloth covering an area of the back surface of the optical screen opposite the front light-receiving area. This is because the hard optical screen 1 is an optical structure layer and has a certain light transmittance, and particularly 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 projection light (for example, an aluminum-plated film), but since the reflectivity of 100% cannot be achieved, all light is partially transmitted, which may cause a decrease in image contrast. Therefore, the back of the optical screen 1, specifically, the back of the aluminum film, can be shielded by a dark protective cloth (for example, black), which is beneficial for preventing light from leaking, and meanwhile, the back of the screen can be prevented from being scratched, and the aluminum film and each optical structure layer can be protected. The protective cloth can be made of various materials, such as fiber materials, plastics or materials for shading and protecting common use by those skilled in the art.
And the same as in the first embodiment, in the closed end of the U shape of the connection cloth 2, that is, the second end extends out of the edge of the optical screen and the edge of the screen frame supporting part 31, and is attached along the screen frame supporting part 31, and is turned over reversely, the end part of the closed end is penetrated with a rigid fixing bar for hooking the elastic connecting piece. Here, the selection and use of the rigid fixing bar can be referred to in the first embodiment, and will not be described herein.
And, similar to the first embodiment, since the area of the screen plate 1 is large, a plurality of elastic connecting members 4 are usually required to be stretched together to effectively unfold the screen plate 1 and the connecting cloth 2 into a flat state. The arrangement of the elastic connection member on the screen frame is also different according to the connection manner of the soft connection cloth and the optical screen. When the soft connecting cloth is only arranged at the upper edge and the lower edge of the optical screen, the elastic connecting pieces are arranged at the upper side and the lower side and are used for connecting the screen frames at the upper side and the lower side and the upper side and the lower side of the optical screen, when the soft connecting cloth is arranged at the peripheral edge of the optical screen, the elastic connecting pieces can be distributed around the optical screen or the screen frames, and at the moment, the elastic connecting pieces 4 can be arranged at intervals and have proper arrangement density.
Therefore, on one hand, a plurality of elastic connecting pieces 4 can be utilized to provide sufficient indirect tensile force for the screen plate 1, and on the other hand, the elastic connecting pieces 4 have proper quantity, and the difficulty in mounting the projection screen caused by the overlarge quantity of the elastic connecting pieces 4 can be avoided. Generally, when the distance between adjacent elastic connecting pieces is about 134mm, the screen plate 1 can be fixed, and meanwhile, the screen plate 1 is guaranteed to have enough flatness. As an optional arrangement manner of the elastic connecting members 4, the elastic connecting members 4 may be disposed around the screen plate 1 at intervals, for example, in equal intervals in symmetrical directions. Therefore, the screen plate 1 can be effectively stretched in all directions under the action of the tensile force of the elastic connecting piece 4 in all directions, and the flat state is kept.
As another alternative arrangement, the periphery of the screen plate 1 is still provided with the elastic connecting members 4, and the arrangement density of the elastic connecting members located at the left and right sides of the screen plate 1 is less than that of the elastic connecting members located at the upper and lower sides of the screen plate. Therefore, the elastic connecting pieces 4 still surround the periphery of the screen plate 1, but the elastic connecting pieces on the upper side and the lower side of the screen plate 4 are arranged more densely, and the elastic connecting pieces on the left side and the right side are arranged more sparsely, so that the tensile acting force on the upper side and the lower side of the screen plate 1 is larger, and the stress of inward curling or outward stretching of the screen plate 1 can be effectively resisted; the screen plate 1 is naturally sagged, and the stress of curling in the vertical direction is very small, so that the stretching acting force on the left side and the right side is small. The elastic connecting piece 4 arranged like this can still combine the stretching requirements of the different directions of the screen plate 1 to apply proper stretching force to all directions of the screen plate 1, thereby achieving better stretching and fixing effects and bringing certain convenience for installation due to the reduction of the number of the elastic connecting pieces.
The second embodiment of the invention provides another projection screen structure, the optical screen is partially attached to the soft connecting cloth, the hard optical screen is fixed to the hollow screen frame by using the stretching force of the elastic connecting piece, the optical screen is stretched and flattened while the optical screen is fixed, the flatness of the optical screen is better, and the display quality of a projection picture is improved.
EXAMPLE III
A third embodiment of the invention provides a projection display system, as shown in fig. 12. The projection display system provided by this embodiment specifically includes a projection device 10 and the projection screen 11 in the foregoing first embodiment or second embodiment, where the projection device is configured to project a projection picture onto an optical screen of the projection screen, specifically, the projection device is a laser ultra-short-focus projection apparatus, has a small projection ratio, projects a projection beam onto the projection screen 11 in an oblique direction with a large inclination angle, and the projection screen 11 is a front projection screen, and reflects light rays back to human eyes to form a picture. The detailed structure, operation principle and function of the projection screen have been described in detail in the foregoing embodiments, and are not described herein again.
In the projection display system of this embodiment, the projection screen may specifically include an optical screen hard optical screen, a soft connecting cloth, a screen frame surrounding the optical screen, and a plurality of elastic connecting pieces; the optical screen has good flatness while realizing fixation, and is beneficial to improving the projection display quality.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (11)
1. A projection screen for ultra-short-focus orthographic projection display, comprising:
the optical screen comprises an optical structure layer, and the front surface of the optical screen is a projection light receiving surface;
the first end of the connecting cloth is attached to at least the back area of the optical screen, the second end of the connecting cloth extends out of the edge of the optical screen, the second end of the connecting cloth surrounds a closed end, and the closed end contains a rigid fixing piece;
the screen frame is arranged around the optical screen and positioned outside the edge of the connecting cloth, and the screen frame is a hollow rectangle;
the rigid fixing piece is fixed on the screen frame through a connecting piece so as to fix the optical screen on the screen frame through the connecting cloth.
2. The projection screen of claim 1 wherein the closed end is a closed hole and the rigid mount is a rigid bar that is inserted through the closed hole.
3. The projection screen of claim 2 wherein the rigid rods are fiberglass or metal.
4. The projection screen of claim 1 wherein the screen frame is enclosed beyond the edges of the back side of the optical screen.
5. The projection screen of claim 1,
the screen frame includes outer supporting part along, connect the cloth to stretch out the edge of optical screen extremely reverse buckling, parcel outer supporting part along behind the outside of supporting part, the edge of optical screen does connect the second tip of cloth, the rigidity mounting is located the back of optical screen.
6. The projection screen of claim 1,
the back surface of the optical screen is attached to a first end portion of the connection cloth, and the first end portion of the connection cloth covers at least a region corresponding to a front light-receiving region of the back surface of the optical screen.
7. The projection screen of claim 1 wherein edges of both the front and back sides of the optical screen are attached to the first end of the connecting cloth.
8. The projection screen of any of claims 1-7 wherein the bonding fabric is black and the optical screen includes a reflective layer, the bonding fabric being bonded to the reflective layer.
9. The projection screen of any of claims 1-7, wherein the screen frame is connected to the connector by a snap fit, threaded fastener, or rivet.
10. A projection screen according to any one of claims 1 to 7 wherein stiffening beams or ribs are provided in the internal cavity of the screen frame.
11. A projection display system comprising a projection device for projecting a projection picture onto an optical screen of a projection screen and the projection screen of any one of claims 1-10;
the screen frame is positioned outside the edge of the connecting cloth, and the screen frame is larger than the connecting cloth; one end of the connecting piece is connected to the edge of the connecting cloth, and the other end of the connecting piece extends out of the edge of the connecting cloth and is fixed on the screen frame outside the connecting cloth.
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| CN202011212005.2A CN112162458B (en) | 2018-03-19 | 2018-03-19 | Projection screen and projection display system |
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| CN108388074A (en) * | 2018-03-19 | 2018-08-10 | 青岛海信激光显示股份有限公司 | Projection screen and optical projection system |
| US10918228B2 (en) * | 2018-12-19 | 2021-02-16 | Hisense Laser Display Co., Ltd. | Screen frame and laser projection display device |
| WO2020125016A1 (en) * | 2018-12-19 | 2020-06-25 | 青岛海信激光显示股份有限公司 | Screen frame and laser projection display device |
| CN109831633A (en) * | 2019-03-11 | 2019-05-31 | 四川长虹电器股份有限公司 | A kind of ultra-thin laser television optical screen structure |
| CN112114489A (en) * | 2019-06-19 | 2020-12-22 | 青岛海信激光显示股份有限公司 | Projection screen, projection system and method of assembling projection screen |
| CN112198748B (en) * | 2020-11-09 | 2023-08-04 | 青岛海信激光显示股份有限公司 | Projection screen and projection equipment |
| WO2023020543A1 (en) * | 2021-08-17 | 2023-02-23 | 青岛海信激光显示股份有限公司 | Projection apparatus |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN112162457A (en) | 2021-01-01 |
| CN108681201A (en) | 2018-10-19 |
| CN112162458B (en) | 2022-05-10 |
| CN112162457B (en) | 2022-04-22 |
| CN108681201B (en) | 2020-11-10 |
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