CN214067569U

CN214067569U - Projection screen

Info

Publication number: CN214067569U
Application number: CN202120355008.5U
Authority: CN
Inventors: 代琪; 陈波; 张健
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-02-08
Filing date: 2021-02-08
Publication date: 2021-08-27
Anticipated expiration: 2031-02-08

Abstract

The embodiment of the application discloses a projection screen, and belongs to the technical field of projection. The projection screen includes: a corner block; the length of the supporting assemblies is adjustable, four supporting assemblies are encircled end to end, and the end parts of two adjacent supporting assemblies are connected through the corner blocks to form a rectangular frame; the corner of the flexible curtain sheet is fixed on the corner block, and the edge of the flexible curtain sheet is detachably fixed on the supporting component. In the embodiment of the application, when the projection screen with larger size is transported, the length of the supporting component can be shortened through adjustment, and meanwhile, the flexible curtain sheet is bent, so that the size of the projection screen is reduced, and the transportation of the projection screen is ensured; in addition, because the two adjacent supporting components are connected through the corner blocks, the included angle of the two adjacent supporting components is limited through the corner blocks, the regularity of the rectangular frame formed after connection is further ensured, and the problem that the corners of the rectangular frame form sharp corners is avoided.

Description

Projection screen

Technical Field

The embodiment of the application relates to the technical field of projection, in particular to a projection screen.

Background

With the continuous development of science and technology, laser projection equipment is more and more applied to the work and the life of people. Currently, a laser projection apparatus mainly includes an optical engine and a projection screen. The light outlet of the optical engine faces the projection screen to emit light beams to the projection screen, and the projection screen is used for receiving the light beams to realize the display of pictures. In order to improve the viewing effect and improve the anti-reflection and eye protection effects, the size of the projection screen is larger and larger.

In the related art, a projection screen mainly includes a frame and a screen, wherein the screen is stretched and fixed on the frame to receive a light beam emitted from an optical engine. The frame comprises four frames, and the four frames are fixedly connected end to end through angle irons. When pursuing a large-size projection screen, in order to ensure normal entry of the large-size projection screen, the entry of parts of the projection screen into the home is provided. Namely, the four frames, the angle iron and the screen are independently put into the home and then spliced and assembled to obtain the projection screen.

However, in the related art, when two adjacent frames are fixed by the angle iron, it is difficult to ensure that two sides of the angle iron are respectively parallel to the corresponding frames, so that the rectangular frame assembled on site is irregular; in addition, the end parts of the frames are inclined planes, and the splicing seams at the end parts of two adjacent frames are easy to have dislocation, so that the corners of the rectangular frame form sharp angles.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a projection screen, so that the phenomenon that a curtain is distorted due to distortion deformation of a frame in the projection screen can be avoided. The technical scheme is as follows:

a projection screen, comprising:

a corner block;

the length of the supporting assemblies is adjustable, four supporting assemblies are encircled end to end, and the end parts of two adjacent supporting assemblies are connected through the corner blocks to form a rectangular frame;

the corner of the flexible curtain sheet is fixed on the corner block, and the edge of the flexible curtain sheet is detachably fixed on the supporting component.

Optionally, the support assembly comprises a first support bar, a second support bar and a first connector;

the first end of the first supporting rod is connected with the first end of the second supporting rod through the first connecting piece, the first connecting piece can adjust the distance between the first end of the first supporting rod and the first end of the second supporting rod, and the second end of the first supporting rod and the second end of the second supporting rod are respectively connected with the corresponding corner blocks;

the edge of the flexible curtain sheet is detachably fixed on the first supporting rod and the second supporting rod.

Optionally, the first connecting member includes a gear and a rack, the gear is rotatably fixed to the first end of the first support rod, one end of the rack is fixed to the first end of the second support rod, and the gear is engaged with the rack.

Optionally, the support assembly further comprises a fixing cover having an adjustment hole and a limit screw;

the first end of the first supporting rod is provided with an installation groove, the gear is positioned in the installation groove, and the fixing cover is buckled on the installation groove and is fixedly connected with the first supporting rod;

the central line of the rotating shaft of the gear is coincided with the central line of the adjusting hole, and the limiting screw can be screwed into the mounting groove to limit the length of the supporting component.

Optionally, one end of the limit screw is clamped in the gear tooth groove.

Optionally, one end of the limit screw is clamped in the tooth groove of the rack.

Optionally, the fixed cover extends along a length direction of the first support rod to form an ear plate, and the ear plate is fixedly connected with the first support rod.

Optionally, the support assembly further comprises a stiffening rod;

the cross section of each reinforcing rod is U-shaped, the two ends of each reinforcing rod extend into the first end of each first supporting rod and the first end of each second supporting rod respectively, one end of each reinforcing rod is fixedly connected with the corresponding first supporting rod or the corresponding second supporting rod, and the reinforcing rods are buckled on the racks.

Optionally, when one end of the reinforcing rod is fixedly connected with the first support rod, the reinforcing rod and the first support rod are of an integrated structure.

Optionally, when one end of the reinforcing rod is fixedly connected with the second supporting rod, the reinforcing rod and the second supporting rod are of an integrated structure.

Optionally, the corner block is of unitary construction with the adjacent support assembly.

Optionally, the projection screen further comprises a second connector;

all pass through between angle block and the adjacent supporting component the second connecting piece is connected, the second connecting piece can be adjusted the angle block with correspond the distance between the bracing piece.

The technical scheme provided by the embodiment of the application has the beneficial effects that at least:

in the embodiment of the application, when the projection screen with larger size is transported, the length of the supporting component can be shortened through adjustment, and meanwhile, the flexible curtain sheet is bent, so that the size of the projection screen is reduced, and the transportation of the projection screen is ensured; after the projection screen enters the home, the length of the supporting component can be adjusted to be prolonged, then the flexible curtain sheet can be tensioned, the flatness of the flexible curtain sheet is guaranteed, and then the edge of the flexible curtain sheet is fixed with the supporting component. Because two adjacent supporting components are connected through the corner block, the included angle of the two adjacent supporting components is limited through the corner block, the regularity of the rectangular frame formed after connection is further ensured, and the problem that the corner of the rectangular frame forms a sharp corner is avoided.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is an exploded schematic view of a projection screen according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a corner block provided in an embodiment of the present application;

fig. 3 is a schematic front view of a projection screen according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a support assembly provided in an embodiment of the present application;

FIG. 5 is a schematic structural diagram of another support assembly provided in embodiments of the present application;

FIG. 6 is a schematic structural diagram of another support assembly provided in the embodiments of the present application;

FIG. 7 is a schematic diagram illustrating a partially exploded structure of another support assembly provided in an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a first support rod according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of another support assembly provided in an embodiment of the present application;

FIG. 10 is a schematic illustration of a partially exploded view of yet another support assembly provided by an embodiment of the present application;

fig. 11 is a schematic structural diagram of a connection between a corner block and a support assembly according to an embodiment of the present application.

Reference numerals:

1: a corner block; 2: a support assembly; 3: a flexible curtain sheet; 4: a second connecting member; 5: soaking cotton glue;

21: a first support bar; 22: a second support bar; 23: a first connecting member; 24: a fixed cover; 25: a reinforcing rod;

211: mounting grooves; 231: a gear; 232: a rack; 241: an adjustment hole; 242: a limit screw; 243: an ear plate.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present application more clear, the embodiments of the present application will be further described in detail with reference to the accompanying drawings.

Fig. 1 illustrates a schematic structural diagram of a projection screen according to an embodiment of the present application. As shown in fig. 1, the projection screen includes: a corner block 1; the length of the supporting assemblies 2 is adjustable, the four supporting assemblies 2 are encircled end to end, and the end parts of two adjacent supporting assemblies 2 are connected through corner blocks 1 to form a rectangular frame; flexible curtain 3, the bight of flexible curtain 3 is fixed on corner piece 1, and the edge detachable of flexible curtain 3 fixes on supporting component 2.

In the embodiment of the application, when the projection screen with larger size is transported, the length of the supporting component 2 can be shortened through adjustment, and meanwhile, the flexible curtain sheet 3 is bent, so that the size of the projection screen is reduced, and the transportation of the projection screen is ensured; after the projection screen enters the home, the length of the supporting component 2 can be adjusted to be prolonged, then the flexible curtain 3 can be tensioned, the flatness of the flexible curtain 3 is guaranteed, and then the edge of the flexible curtain 3 is fixed with the supporting component 2. Because connect through the horn block 1 between two adjacent supporting component 2 to inject two adjacent supporting component 2's contained angle through the horn block 1, and then guaranteed the regularity of the rectangular frame who forms after connecting, avoided the problem that the bight of rectangular frame forms the closed angle simultaneously.

Wherein, as shown in fig. 2, the corner block 1 is a right angle corner block, so that after the corner block 1 is connected with two adjacent supporting components 2, the included angle formed by two adjacent supporting components 2 can be ensured to be a right angle, and the regularity of the formed rectangular frame can be further ensured.

In some embodiments, as shown in fig. 3, the corners of the flexible sheet 3 are secured to the front of the corner block 1 and the edges of the flexible sheet 3 are secured to the front of the support assembly 2. Optionally, the flexible curtain 3 is an optical film, and the corner and edge of the optical film are fixed on the corner block 1 and the support assembly 2, respectively.

In other embodiments, the corners of the flexible curtain 3 are folded and fixed on the back of the corner blocks 1; the edge of the flexible curtain 3 is folded and fixed on the back of the support component 2. Optionally, the flexible curtain sheet 3 includes an optical film and a flexible carrier, the optical film is bonded to the flexible carrier, the flexible carrier extends out of the edge of the optical film, the corner of the flexible carrier is folded to the back of the corner block 1 and is fixedly connected with the corner block 1, and the edge of the flexible carrier is folded to the back of the support component 2 and is fixedly connected with the support component 2.

Of course, in other embodiments, the corners of the flexible curtain 3 may be fixed to the front of the corner blocks 1, and the edges of the flexible curtain 3 may be folded and fixed to the back of the support assembly 2; or the corners of the flexible curtain sheet 3 are folded and fixed on the back of the corner blocks 1, and the edges of the flexible curtain sheet 3 are fixed on the front of the support assembly 2, which is not limited in the embodiment of the present application.

The structure of the flexible curtain 3 can refer to the situation that the corners and edges of the flexible curtain 3 are fixed on the back, which is not described in detail in the embodiments of the present application.

For any of the above embodiments, the corner of the flexible curtain 3 is fixed on the corner block 1 by a fixing screw, or fixed on the corner block 1 by bonding; the edge of the flexible curtain 3 is fixed on the support component 2 by a fixing screw or fixed on the support component 2 by an adhesive way.

Illustratively, the corners of the flexible screen 3 are fixed on the corner blocks 1 by fixing screws, as shown in fig. 1, the projection screen further comprises foam rubber 5, and the edges of the flexible screen 3 are adhered to the support members 2 by the foam rubber 5.

Of course, the edge of the flexible curtain 3 may be fixed in other ways than the above. Illustratively, when the edge of the flexible screen 3 is fixed on the back of the support component 2, the projection screen further comprises a rod body and a tensioning mechanism; the edge of flexible curtain piece 3 has the holding pocket, and the edge of flexible curtain piece 3 turns over the edge of turning over with parcel rectangular frame, and the body of rod is located the holding pocket, and straining device's one end is connected with the body of rod, and straining device's the other end is connected with supporting component 2. Like this, through the taut body of rod of straining mechanism to the realization is to the whole take-up at flexible curtain 3 edges, has guaranteed the homogeneity to the tensioning of flexible curtain 3, can further guarantee the plane degree of flexible curtain 3.

Optionally, the tensioning mechanism is a tensioning spring. Of course, the tensioning mechanism can also be other tensioning mechanisms capable of adjusting the tensioning degree of the edge of the flexible curtain sheet 3, so that the tensioning degree of the flexible curtain sheet 3 can be ensured by adjusting the tensioning mechanism, and the flatness of the flexible curtain sheet 3 can be further ensured. The specific structure of the tensioning mechanism can refer to the related art, and is not described in detail in the embodiments of the present application.

It should be noted that, when the corner of the flexible curtain sheet 3 is fixed on the front surface of the corner block 1 by the fixing screw, and/or the edge of the flexible curtain sheet 3 is fixed on the front surface of the support assembly 2 by the fixing screw, the projection screen further includes an outer frame, and the outer frame wraps the edges of the rectangular frame and the flexible curtain sheet 3. Like this, the rectangle frame that four supporting component 2 formed through 1 connection of horn piece is interior frame, and flexible curtain piece 3 is through the front of frame including fixed screw is fixed, and then through the edge of frame in the outline parcel to shelter from set screw, thereby improve projection screen's aesthetic property.

In some embodiments, as shown in fig. 1, the support assembly 2 comprises a first support bar 21, a second support bar 22, and a first connector 23; the first end of the first support rod 21 and the first end of the second support rod 22 are connected through the first connecting piece 23, the first connecting piece 23 can adjust the distance between the first end of the first support rod 21 and the first end of the second support rod 22, and the second end of the first support rod 21 and the second end of the second support rod 22 are respectively connected with the corresponding corner block 1; the edge of the flexible curtain 3 is detachably fixed on the first support bar 21 and the second support bar 22. In this way, the first connecting member 23 can adjust the distance between the first end of the first supporting rod 21 and the first end of the second supporting rod 22, so as to adjust the length of the stack supporting assembly 2, and further adjust the progress of the flexible curtain 3.

Optionally, the first support rod 21 and the second support rod 22 of the support assembly 2 are respectively integrated with the corresponding corner block 1, that is, the corner block 1 is integrated with the adjacent first support rod 21 and the adjacent second support rod 22, so as to reduce the number of parts included in the projection screen, thereby reducing the assembly process of the projection screen and improving the assembly efficiency.

Optionally, the first connecting piece 23 is a single-head bolt, a stud end of the single-head bolt is rotatably connected with the first end of the first support rod 21, and a threaded end of the single-head bolt is in threaded connection with the first end of the second support rod 22; alternatively, as shown in fig. 4, the first connecting member 23 is a stud bolt, a first end of the stud bolt is threadedly connected to the first end of the first support rod 21, and a second end of the stud bolt is threadedly connected to the first end of the second support rod 22. In this way, the distance between the first end of the first support bar 21 and the first end of the second support bar 22, i.e. the length of the support assembly 2, can be adjusted by rotating the single-headed bolt or the double-headed bolt.

Of course, as shown in fig. 5, the first connecting member 23 includes a gear 231 and a rack 232, the gear 231 is rotatably fixed to the first end of the first support bar 21, one end of the rack 232 is fixed to the first end of the second support bar 22, and the gear 231 is engaged with the rack 232. In this way, the rotating gear 231 moves to the rack 232, so that the first end of the second support rod 22 approaches or moves away from the first support rod 21, and the length of the support assembly 2 can be adjusted.

The length direction of the rack 232 is parallel to the length direction of the second support rod 22, and the axial direction of the gear 231 is perpendicular to the length direction of the first support rod 21, so that the length of the first support rod 21 and the length of the second support rod 22 on a straight line can be guaranteed to be changed when the gear 231 is rotated, and the regularity of a rectangular frame formed after the support assembly 2 and the corner block 1 are connected is guaranteed.

In some embodiments, a sidewall of the first end of the first support bar 21 has a fixing hole, and the gear 231 is fixed to a rotation shaft fixed to a sidewall of the fixing hole through a bearing. The rotation shaft may protrude through the fixing hole, so that it is convenient to rotate the rotation shaft using a tool to rotate the gear 231.

In other embodiments, as shown in fig. 6 or 7, and fig. 8, the support assembly 2 further comprises a fixing cover 24, the fixing cover 24 having an adjustment hole 251 and a limit screw 252; the first end of the first supporting rod 21 is provided with a mounting groove 111, the gear 231 is positioned in the mounting groove 111, and the fixing cover 24 is buckled on the mounting groove 111 and is fixedly connected with the first supporting rod 21; the center line of the rotation axis of the gear 231 coincides with the center line of the adjustment hole 251, and the limit screw 252 can be screwed into the mounting groove 111 to define the length of the support assembly 2. Thus, the installation of the gear 231 is facilitated by the installation of the installation groove 111, and the lubrication of the gear 231 and the rack 232 is facilitated by the installation of the fixing cover 24, so that the strength of the installation groove 111 on the first support rod 21 is ensured.

Wherein, the rotation axis of the gear 231 can protrude out of the adjusting hole 251, so that the rotation axis can be rotated by a tool to drive the gear 231 to rotate.

Alternatively, one end of the limit screw 252 is caught in the tooth groove of the gear 231, or one end of the limit screw 252 is caught in the tooth groove of the rack 232. In this way, the length of the support assembly 2 is limited by the retention screw 252 being captured in the tooth slot of the gear 231 or rack 232, avoiding the situation where the gear 231 is caused to rotate to shorten the support assembly 2 under the opposing force of the flexible curtain 3.

The fixing cover 24 has an ear plate 253 extending along the length direction of the first support rod 21, and the ear plate 253 is fixedly connected with the first support rod 21. Illustratively, as shown in fig. 7, the connecting block has two opposing ear plates 253, and the two ear plates 253 clamp the support assembly 2 and are fixedly connected by fixing screws.

In some embodiments, as shown in fig. 9 and 10, the support assembly 2 further includes a reinforcing bar 25, the reinforcing bar 25 has a U-shaped cross section, two ends of the reinforcing bar 25 respectively extend into the first end of the first support bar 21 and the first end of the second support bar 22, one end of the reinforcing bar 25 is fixedly connected to the first support bar 21 or the second support bar 22, and the reinforcing bar 25 is fastened to the rack 232. Thus, only one end of the reinforcing rod 25 is fixedly connected, and the other end of the reinforcing rod 25 can move relative to the corresponding support rod when the gear 231 is rotated, thereby ensuring the adjustability of the length of the support assembly 2.

Wherein, the reinforcing rod 25 has a U-shaped cross section, so that the fixing of the rack 232 and the second support rod 22 is not affected. When the one end of the reinforcing rod 25 is fixedly connected to the first support rod 21, the one end of the reinforcing rod 25 is optionally connected to the first support rod 21 by a fixing screw, and of course, in order to reduce the number of parts included in the support assembly 2 and reduce the assembly process of the support assembly 2, the reinforcing rod 25 and the first support rod 21 are of an integrated structure. When one end of the reinforcing rod 25 is fixedly connected to the second support rod 22, optionally, one end of the reinforcing rod 25 is connected to the second support rod 22 by a fixing screw, and of course, in order to reduce the number of components included in the support assembly 2 and reduce the assembly process of the support assembly 2, the reinforcing rod 25 and the second support rod 22 are of an integrated structure.

In some embodiments, the corner block 1 is a unitary structure with the adjacent support member 2. In this way, the number of parts included in the projection screen can be reduced and the number of assembling processes of the projection screen can be reduced by connecting the corner block 1 and the adjacent support assembly 2.

In other embodiments, as shown in FIG. 11, the projection screen further comprises a second connector 4; all be connected through second connecting piece 4 between horn block 1 and the adjacent supporting component 2, second connecting piece 4 can adjust the distance between horn block 1 and the corresponding supporting component 2. Like this, after the length of adjustment supporting component 2, can also continue to adjust the distance between two adjacent hornblocks 1 through second connecting piece 4 to the realization is to the further tensioning of flexible curtain piece 3, guarantees the roughness of flexible curtain piece 3.

Wherein the second connecting member 4 is a rigid second connecting member 4 or an elastic second connecting member 4.

When the second connecting piece 4 is a rigid second connecting piece 4, the second connecting piece 4 is a single-head bolt, the stud end of the single-head bolt is rotatably connected with one of the corner block 1 and the supporting component 2, and the threaded end of the single-head bolt is in threaded connection with the other one of the corner block 1 and the supporting component 2; or the second connecting piece 4 is a stud bolt, and two ends of the stud bolt are respectively in threaded connection with the corner block 1 and the supporting component 2. Thus, the distance between the corner block 1 and the support component 2 can be adjusted by rotating the single-headed bolt or the stud bolt.

When the second connecting member 4 is an elastic second connecting member 4, the second connecting member 4 is a compression spring. At the moment, two ends of the compression spring are respectively abutted on the corner block 1 and the support component 2. In this way, the distance between the corner block 1 and the support assembly 2 can be adjusted by the compression of the compression spring, and the expansion of the compression spring.

In order to avoid the misalignment between the corner block 1 and the support assembly 2 in the length direction of the corner block and the support assembly 2, in some embodiments, the projection screen further includes a sleeve, one end of the sleeve is sleeved on the corner block 1, the other end of the sleeve is sleeved on the support assembly 2, and the compression spring is located in the sleeve. Therefore, the angle block 1 and the supporting component 2 can be limited through the sleeve, and the direction of separation of the supporting component 2 and the angle block 1 is ensured under the action of elastic force of the compression spring.

In other embodiments, the corner block 1 has a receiving groove, the end of the supporting component 2 extends into the receiving groove, and two ends of the compression spring respectively abut against the bottom of the receiving groove and the end of the supporting component 2. Like this, can carry on spacingly through the storage tank to horn block 1 and supporting component 2, guarantee under compression spring's elastic force effect, the direction of supporting component 2 and horn block 1 separation.

Optionally, the groove bottom of the accommodating groove and/or the end part of the supporting component 2 are provided with grooves, and the end part of the compression spring is positioned in the grooves, so that the compression spring can be limited through the grooves, and the inclination of the compression spring is avoided.

In addition, the projection screen further comprises a limiting bolt, the groove wall of the accommodating groove is provided with a sliding groove, the end part of the supporting component 2 is provided with a fixing hole, and one end of the limiting bolt penetrates through the sliding groove and is fixed in the fixing hole. Like this, when supporting component 2 removed relative angle piece 1, can avoid supporting component 2's tip roll-off storage tank through the spout to the spacing of spacing bolt. Wherein, the length direction of spout is parallel with the length direction of supporting component 2.

In the embodiment of the application, when the projection screen with larger size is transported, the length of the supporting component can be shortened by adjusting the first connecting piece, and meanwhile, the flexible curtain sheet is bent, so that the size of the projection screen is reduced, and the transportation of the projection screen is ensured; after the projection screen enters a house, the length of the supporting component can be prolonged by adjusting the first connecting piece, and then the flexible curtain sheet can be tensioned; further, still can not be when the flexible curtain of complete tensioning after the supporting component adjustment, can also further adjust the distance between two adjacent hornblocks through the second connecting piece to realize the further tensioning to the flexible curtain, guarantee the roughness of flexible curtain, later fixed with the edge and the supporting component of flexible curtain. Because two adjacent supporting components are connected through the corner block, the included angle of the two adjacent supporting components is limited through the corner block, the regularity of the rectangular frame formed after connection is further ensured, and the problem that the corner of the rectangular frame forms a sharp corner is avoided.

The above description is only illustrative of the embodiments of the present application and is not intended to limit the embodiments of the present application, and any modification, equivalent replacement, or improvement made within the spirit and principle of the embodiments of the present application should be included in the scope of the embodiments of the present application.

Claims

1. A projection screen, comprising:

a corner block;

2. The projection screen of claim 1 wherein the support assembly comprises a first support bar, a second support bar, and a first connector;

3. The projection screen of claim 2 wherein the first connector comprises a gear and a rack, the gear rotatably secured to the first end of the first support bar, one end of the rack secured to the first end of the second support bar, the gear engaged with the rack.

4. The projection screen of claim 3 wherein the support assembly further comprises a retaining cap having an adjustment aperture and a limit screw;

5. The projection screen of claim 4 wherein one end of the limit screw is captured in the gear tooth slot.

6. The projection screen of claim 4 wherein one end of the limit screw is captured within a tooth slot of the rack.

7. The projection screen of claim 4 wherein the retaining cap has an ear plate extending along the length of the first support rod, the ear plate being fixedly attached to the first support rod.

8. The projection screen of any of claims 4-7, wherein the support assembly further comprises a stiffening rod;

9. The projection screen of claim 8 wherein the stiffening rod is of unitary construction with the first support rod when one end of the stiffening rod is fixedly attached to the first support rod.

10. The projection screen of claim 8 wherein the stiffening rod is integrally formed with the second support rod when one end of the stiffening rod is fixedly attached to the second support rod.

11. A projection screen according to claim 1 wherein the corner block is a unitary structure with the adjacent support assembly.

12. The projection screen of claim 1, wherein the projection screen further comprises a second connector;

all pass through between angle piece and the adjacent supporting component the second connecting piece is connected, the second connecting piece can be adjusted the angle piece and correspond the distance between the supporting component.