CN218350701U - Projection screen and laser projection system - Google Patents

Abstract

The application discloses projection screen and projection system belongs to the projection display field. The projection screen includes: the curtain piece, base, curling mechanism and elevating system. The winding drum in the winding mechanism can wind the crimpable part in the curtain sheet on the winding drum, and the beam in the lifting mechanism can unwind the crimpable part wound on the winding drum. When projection pictures need to be projected on the curtain sheet, after the lifting mechanism expands the curled part wound on the winding drum through the cross beam, the supporting surface in the cross beam can be in close contact with the deformed part in the curtain sheet, and the supporting surface in the cross beam can provide certain supporting force for the deformed part, so that the probability of the bad phenomenon of curling or internal unevenness of the deformed part region in the curtain sheet is reduced, and the display effect of the projection pictures on the curtain sheet is better.

Description

Projection screen and laser projection system

Technical Field

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

Background

With the continuous development of science and technology, laser projection systems are increasingly applied to the work and life of people. Currently, a laser projection system mainly includes a laser projection apparatus and a projection screen. The laser projection equipment emits light beams to the projection screen, and the projection screen receives the light beams to realize the display of pictures.

Projection screens generally include: the curtain piece, curling mechanism and elevating system. One side of the curtain sheet is connected with the curling mechanism, and the other side of the curtain sheet is connected with the lifting mechanism. The curtain sheet can be retracted through the control of the curling mechanism, and can be unfolded through the control of the lifting mechanism. When the winding mechanism controls the take-up of the screen, one portion of the screen is wound on the winding mechanism and the other portion of the screen is not wound on the winding mechanism.

However, after the curtain sheet is unfolded and folded for a plurality of times, the part wound on the coiling mechanism is easily deformed by the external force, and the part not wound on the coiling mechanism is not deformed. The poor phenomenon of edge curling or internal unevenness is easy to occur in the transition area between the deformed part and the non-deformed part in the curtain sheet, and the display effect of the projection picture on the curtain sheet is poor.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a projection screen and a laser projection system. The problem that a transition region between a deformed part and an undeformed part in a curtain sheet in a projection screen in the prior art is easily curled or internally uneven can be solved, and the technical scheme is as follows:

in one aspect, a projection screen is provided, the projection screen comprising:

the device comprises a screen, a base, a curling mechanism and a lifting mechanism;

the curtain sheet includes: a planar portion and a crimpable portion, and a deformation portion between the planar portion and the crimpable portion;

the curling mechanism is fixed on the base and comprises a reel, one side of the crimpable part, which faces away from the plane part, is fixedly connected with the reel, and the crimpable part can be wound on the reel;

the lifting mechanism is fixed on the base, the lifting mechanism comprises a cross beam, the cross beam is provided with a supporting surface fixedly connected with the plane part, and the lifting mechanism is configured to: controlling unwinding of the crimpable portion wound on the bobbin by the cross member;

wherein the support surface is used for providing a support force for the deformation part.

In another aspect, there is provided a laser projection system, including:

the projection screen comprises a projection screen and laser projection equipment, wherein the projection screen is any one of the projection screens.

The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:

a projection screen, may comprise: the curtain piece, base, curling mechanism and elevating system. The winding drum in the winding mechanism can wind the crimpable part in the curtain sheet on the winding drum, and the beam in the lifting mechanism can unwind the crimpable part wound on the winding drum. When projection pictures need to be projected on the curtain sheet, after the lifting mechanism expands the curled part wound on the winding drum through the cross beam, the supporting surface in the cross beam can be in close contact with the deformed part in the curtain sheet, and the supporting surface in the cross beam can provide certain supporting force for the deformed part, so that the probability of the bad phenomenon of curling or internal unevenness of the deformed part in the curtain sheet is reduced, and the display effect of the projection pictures on the curtain sheet is better. In addition, after the curtain piece expandes, elevating system can apply the effort that deviates from the reel direction to the curtain piece through the crossbeam, and the curling mechanism can apply the effort that deviates from the crossbeam direction to the curtain piece through the reel, through the effort of these two directions for the curtain piece can the tensioning, has guaranteed that the holistic roughness of curtain piece is better.

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 a view showing an effect when a projection screen shown in the related art is retracted;

fig. 2 is an effect diagram of a projection screen shown in the related art when it is unfolded;

FIG. 3 is a graph of cursor effect at the transition between areas of the curtain where creep occurs and areas where creep does not occur;

FIG. 4 is an exploded view of a projection screen according to an embodiment of the present disclosure;

FIG. 5 is an illustration of the effect of the expansion of the projection screen shown in FIG. 4;

FIG. 6 is an illustration of the effects of the collapse of the projection screen shown in FIG. 4;

FIG. 7 is a schematic diagram of the relative positions of the deformation portion and the supporting surface of the cross beam in a curtain sheet according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram illustrating a relative position relationship between a beam and a winding drum after a projection screen provided by an embodiment of the present application is retracted;

FIG. 9 is a schematic diagram of another projection screen according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of a side panel according to an embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram of another projection screen provided in an embodiment of the present application;

FIG. 12 is a schematic structural diagram of another projection screen provided in an embodiment of the present application;

FIG. 13 is a schematic diagram of a laser projection system according to an embodiment of the present disclosure;

fig. 14 is a schematic partial structural diagram of a laser projection system according to an embodiment of the present application.

Specific embodiments of the present application have been shown by way of example in the drawings and will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, the following detailed description of the embodiments of the present application will be made with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a diagram illustrating an effect of a projection screen shown in the related art when the projection screen is retracted. When the curtain sheet 10 is retracted, a portion of the curtain sheet 10 will be wound around the winding mechanism 20, and another portion will not be wound around the winding mechanism 20. During deployment and retraction of the curtain 10, "creep" of the various layer structures in the curtain 10 wound on the winding mechanism 20 can occur. Moreover, this "creep" phenomenon is exacerbated as the number of deployments and stows increases, and when located in environments with high temperatures or humidity. Generally, the portion wound around crimping mechanism 20 will experience "creep" while the portion not wound around crimping mechanism 20 will not. For example, referring to fig. 2 and 3, fig. 2 is a diagram illustrating an effect of a projection screen shown in the related art when the projection screen is unfolded, and fig. 3 is a diagram illustrating an effect of a cursor at a transition region between a creep region and a non-creep region on a screen. In a transition region R3 between the creep region R1 and the non-creep region R2, the curtain sheet 10 is significantly deformed, resulting in poor display of a projection screen projected in the transition region R3.

Referring to fig. 4, 5 and 6, fig. 4 is an exploded schematic view of a projection screen provided in an embodiment of the present application, fig. 5 is an effect diagram of unfolding the projection screen shown in fig. 4, and fig. 6 is an effect diagram of folding the projection screen shown in fig. 4. Projection screen 000 may include: curtain 100, base 200, curling mechanism 300, and lifting mechanism 400.

The curtain 100 in the projection screen 000 may include: a planar portion 101 and a crimpable portion 102, and a deformation portion 103 between the planar portion 101 and the crimpable portion 102.

The curling mechanism 300 in the projection screen 000 may be fixed to the base 200. The winding mechanism 300 may include a winding drum 301, and a side of the windable portion 102 of the curtain sheet 100 facing away from the planar portion 101 may be fixedly connected to the winding drum 301, and the windable portion 102 may be wound on the winding drum 301.

The lift mechanism 400 in the projection screen 000 can be fixed to the base 200, and the lift mechanism 400 can include a beam 401, and the beam 401 can have a support surface a that is fixedly connected to the planar portion 101 in the curtain sheet 100. And the lifting mechanism 400 may be configured to: the unrolling of the rollable portion 102 in the curtain sheet 100 wound on the roll 301 is controlled by the cross beam 401. For example, the edge portion of the planar portion 101 in the curtain sheet 100 may be fixedly connected to the supporting surface a of the cross beam 401 by means of adhesion or screw connection, which is not specifically limited in this embodiment of the application. When the projection screen 000 is integrated in a laser projection system, after the lifting mechanism 400 controls the rollable portion 102 in the curtain sheet 100 to be unfolded through the beam 401, the curtain sheet 100 can receive a light beam emitted by a laser projection device in the laser projection system, so as to display a projection picture.

Among other things, the support surface a in the cross beam 401 can be used to provide a supporting force to the deformation portion 103 in the curtain sheet 100. That is, the rollable portion 102 in the curtain sheet is retracted, or after the lifting mechanism 400 unwinds the rollable portion 102 in the curtain sheet 100 wound on the drum 301 through the cross member 401, the supporting surface a in the cross member 401 can provide a supporting force to the deformation portion 103 in the curtain sheet 100. By way of example, the support surface a in the cross beam 401 can provide a supporting force to at least a portion of the deformation 103 in the curtain sheet 100.

In the embodiment of the present application, for example, when a projection screen needs to be projected on the curtain sheet 100, after the lifting mechanism 400 unwinds the crimpable portion 102 wound on the winding drum 301 through the cross beam 401, the supporting surface a in the cross beam 401 may be in close contact with the deformed portion 103 in the curtain sheet 100, and the supporting surface a in the cross beam 401 may provide a certain supporting force to the deformed portion 103, thereby reducing the probability of the undesirable phenomenon of curling or internal unevenness in the area of the deformed portion 103 in the curtain sheet 100, so that the display effect of the projection screen on the curtain sheet 100 is better. In addition, after the curtain 100 is unfolded, the lifting mechanism 400 can apply an acting force in a direction away from the winding drum 301 to the curtain 100 through the cross beam 401, the curling mechanism 300 can apply an acting force in a direction away from the cross beam 401 to the curtain 100 through the winding drum 301, and the curtain 100 can be tensioned through the acting forces in the two directions, so that the better flatness of the whole curtain 100 is ensured.

In summary, the embodiment of the present application provides a projection screen, which may include: the curtain piece, base, curling mechanism and elevating system. The winding drum in the winding mechanism can wind the crimpable part in the curtain sheet on the winding drum, and the beam in the lifting mechanism can unwind the crimpable part wound on the winding drum. When projection pictures need to be projected on the curtain sheet, after the lifting mechanism expands the curled part wound on the winding drum through the cross beam, the supporting surface in the cross beam can be in close contact with the deformed part in the curtain sheet, and the supporting surface in the cross beam can provide certain supporting force for the deformed part, so that the probability of the bad phenomenon of curling or internal unevenness of the deformed part region in the curtain sheet is reduced, and the display effect of the projection pictures on the curtain sheet is better. In addition, after the curtain piece expandes, elevating system can apply the effort that deviates from the reel direction to the curtain piece through the crossbeam, and the curling mechanism can apply the effort that deviates from the crossbeam direction to the curtain piece through the reel, through the effort of these two directions for the curtain piece can the tensioning, has guaranteed that the holistic roughness of curtain piece is better.

Optionally, please refer to fig. 7, fig. 7 is a schematic diagram illustrating a relative position between a deformation portion of a curtain sheet and a supporting surface of a beam according to an embodiment of the present application. After the lift mechanism 400 in the projection screen 000 unwinds the rollable portion 102 in the curtain sheet 100 wound on the spool 301 via the cross member 401, the orthographic projection of the deformation portion 103 in the curtain sheet 100 on the supporting surface a in the cross member 401 is located in the area of the supporting surface a. In this case, after the lifting mechanism 400 unwinds the crimpable portion 102 wound on the winding drum 301 through the cross beam 401, so that the orthographic projection of the deformation portion 103 in the curtain sheet 100 on the supporting surface a in the cross beam 401 is located in the area of the supporting surface a, the supporting surface a in the cross beam 401 can be in close contact with the whole area of the deformation portion 103 in the curtain sheet 100, and provide a certain supporting force to the whole area of the deformation portion 103, thereby further reducing the probability of the bad phenomenon that the deformation portion 103 in the curtain sheet 100 is curled or internally uneven, and enabling the display effect of the projection picture on the curtain sheet 100 to be better. In practical applications, when different materials are used to make the curtain sheet 100, the width of the area of the deformation portion 103 (the width direction is the same as the rolling direction of the curtain sheet) in the curtain sheet 100 is different after the curtain sheet 100 is unfolded and folded many times. In order to ensure that the flatness of the curtain sheet 100 is good, the width of the supporting surface a in the cross beam 401 needs to be set according to the width of the deformation part 103 in the curtain sheet 100, so that the supporting surface a in the cross beam 401 can support the deformation part 103 in the curtain sheet 100 well.

In the embodiment of the present application, please refer to fig. 8, and fig. 8 is a schematic diagram illustrating a relative position relationship between a beam and a drum after a projection screen provided in the embodiment of the present application is retracted. After the rollable portion 102 in the curtain sheet 100 is fully wound around the roll 301 in the rolling mechanism 300, the roll 301 in the rolling mechanism 300 may be arranged adjacent to the beam 401 in the lift mechanism 400. In this case, by arranging the reel 301 in the curling mechanism 300 adjacent to the beam 401 in the lifting mechanism 400, the distance between the reel 301 and the beam 401 is further reduced. In this way, after the crimpable portion 102 in the curtain sheet 100 is unfolded, the supporting surface a in the cross beam 401 can support the deformation portion 103 between the planar portion 101 and the crimpable portion 102 in the curtain sheet 100, and the deformation in the area of the deformation portion 103 is improved, so that the overall flatness of the curtain sheet 100 is better.

Optionally, please refer to fig. 8 and 9, and fig. 9 is a schematic structural diagram of another projection screen provided in an embodiment of the present application. Base 200 in projection screen 000 may include: the two side plates 201 are oppositely arranged, the winding drum 301 can be located between the two side plates 201, and two ends of the winding drum 301 can be movably connected with first end portions of the two side plates 201 respectively. The elevating mechanism 400 in the projection screen 000 may further include: a bottom plate 402 between the two side plates 201, and a lifting bracket 403 between the cross beam 401 and the bottom plate 402 in the lifting mechanism 400. Two ends of the bottom plate 402 may be fixedly connected to the second ends of the two side plates 201, respectively, and two sides of the lifting bracket 403 may be connected to the bottom plate 402 and the cross beam 401, respectively. Wherein, the first end and the second end of the side plate 201 may be two ends which are oppositely arranged.

It should be noted that the cross beam 401 moves downward while the rollable portion 102 of the curtain sheet 100 is being wound by the winding drum 301. However, the height of the lifting bracket 403 in the lifting mechanism 400 may be a certain height, and after the rollable portion 102 of the curtain sheet 100 is completely wound on the winding drum 301, the relative position between the supporting surface a of the cross beam 401 and the deformation portion 103 of the curtain sheet 100 may not satisfy the target requirement (the target requirement is that after the rollable portion 102 of the curtain sheet 100 wound on the winding drum 301 is unwound, the supporting surface a of the cross beam 401 can provide a certain supporting force for the deformation portion 103 region of the curtain sheet 100). For this purpose, the side plates 201 are disposed on both sides of the winding drum 301, and both ends of the winding drum 301 are movably connected to the first ends of the side plates 201, respectively. In this way, the rollable portion 102 in the curtain sheet 100 can be wound on the reel 301 while the cross member 401 is moved downward by the lifting bracket 403. And after the rollable portion 102 of the curtain sheet 100 wound on the winding drum 301 is unwound again through the cooperation of the lifting bracket 403 and the cross beam 401, the supporting surface a of the cross beam 401 is ensured to provide a certain supporting force for the deformation portion 103 in the curtain sheet 100, so that the flatness of the deformation portion 103 area can be effectively improved.

For example, please refer to fig. 10, fig. 10 is a schematic structural diagram of a side plate according to an embodiment of the present application. A positioning groove 2011 may be disposed at a second end of the side plate 201, and two end portions of the bottom plate 402 are fixed in the positioning groove 2011 and then are fixedly connected to the side plate 201. Thus, the positioning groove 2011 can ensure that the installation accuracy between the bottom plate 402 and the side plate 201 is good. In the present application, as shown in fig. 9, the lifting mechanism 400 in the projection screen 000 may further include: a second driving motor 404 and a second transmission structure 405, wherein the second driving motor 404 can be fixed on the bottom plate 402, and the second transmission structure 405 can be respectively connected with the second driving motor 404 and the lifting bracket 403. For example, after the second transmission structure 405 is connected to the second driving motor 404 and the lifting bracket 403 respectively, the second driving motor 404 can drive the lifting bracket 403 to lift through the second transmission structure 405. The lifting bracket 403 further drives the beam 401 to lift, so as to unfold and fold the curtain 100.

In the embodiment of the present application, as shown in fig. 9, the second transmission structure 405 may include: a lead screw 4051 and a slide block 4052 sleeved on the lead screw 4051. An output shaft of the second driving motor 404 may be connected to an end of the lead screw 4051, and the lifting bracket 403 may be connected to the base plate 402 and the slider 4052, respectively. Like this, when the output shaft of second driving motor 404 drove lead screw 4051 and rotates, slider 4052 cup jointed on lead screw 4051 can remove along the length direction of lead screw 4051 to the realization drives lifting support 403 through slider 4052 and goes up and down. In other possible implementations, the second transmission structure 405 may also include: a gear and a rack (not shown in the figure) which are matched with each other, an output shaft of the second driving motor 404 can be connected with the gear, and the rack can be connected with the lifting bracket 403. So, drive gear revolve through second driving motor 404, gear revolve drives the rack removal, and then drives lifting support 404 through the rack and goes up and down, and this application embodiment does not do specific injecing to this.

In the embodiment of the present application, please refer to fig. 11, and fig. 11 is a schematic structural diagram of another projection screen provided in the embodiment of the present application. The curling mechanism 300 in projection screen 000 may further include: a drive assembly 302 is fixed to the side plate 201, and the drive assembly 302 is connected to the reel 301 in the winding mechanism 300. Wherein the drive assembly 302 may be configured to: the winding drum 301 is rotated to wind the crimpable portion 102 of the curtain sheet 100 on the winding drum 301. In this case, the side plate 201 can be used to fixedly support the driving assembly 302, and after the driving assembly 302 is connected to the winding drum 301, the driving assembly 302 can drive the winding drum 301 to rotate so as to wind the crimpable portion 102 of the curtain sheet 100 on the winding drum 301.

There are several alternative implementations of the drive assembly 302 for driving the rotation of the winding drum 301 in the winding mechanism 300, and the following embodiments of the present application are schematically illustrated by the following two alternative implementations:

in a first alternative implementation, as shown in fig. 11, drive assembly 302 of crimping mechanism 300 may include: a first driving motor 3021 and a first transfer structure 3022, the first driving motor 3021 may be fixed on the side plate 201 in the base 200, and the first transfer structure 3022 may be connected to the first driving motor 3021 and the drum 301, respectively. By way of example, the first transmission structure 3022 may include: a first pulley a1, a second pulley a2 and a conveyor belt a3. Wherein, the conveyor belt a3 can be respectively sleeved on the first belt pulley a1 and the second belt pulley a 2. The winding drum 301 may have a rotation shaft b1, an output shaft of the first driving motor 3021 may be fixedly connected with the first driving shaft a1, and the rotation shaft b1 on the winding drum 301 may be fixedly connected with the second pulley a 2. As such, when the output shaft of the first drive motor 3021 rotates, the first pulley a1 can be rotated; the first belt wheel a1 rotates to drive the conveying belt a3 to rotate; the rotation of the conveyor belt a3 can drive the second belt pulley a2 to rotate, and then the second belt pulley a2 drives the rotation shaft b1 on the winding drum 301 to rotate, so as to realize the rotation of the winding drum 301. In other possible implementations, the first transmission structure 3022 may further include: two gears (not shown in the figure) that mesh with each other, one of which may be connected to an output shaft of the first drive motor 3021 and the other of which may be connected to the rotation shaft b1 on the reel 301. This is not specifically limited in the embodiments of the present application.

Illustratively, as shown in fig. 10, the side plate 201 may have a first mounting slot 2012 and a second mounting slot 2013, the output shaft of the first driving motor 3021 may pass through the first mounting slot 2012 to connect with the first pulley a1, and the rotating shaft b1 of the winding drum 301 may pass through the second mounting slot 2013 to connect with the second pulley a 2. Therefore, the mounting accuracy of the first driving motor 3021 and the first pulley a1 can be effectively improved through the first mounting slot 2012. The second mounting slot 2013 can effectively improve the mounting accuracy of the winding drum 301 and the side plate 201, and improve the mounting accuracy of the rotating shaft b1 on the winding drum 301 and the second belt wheel a 2.

Referring to fig. 12, fig. 12 is a schematic structural diagram of another projection screen according to an embodiment of the present application. Drive assembly 302 in crimping mechanism 300 may include: a rotating shaft 3023, a fixed piece 3024, and a clockwork 3025. The winding drum 301 can be sleeved on the rotating shaft 3023 and movably connected with the rotating shaft 3023. The rotating shaft 3023 may be fixed to the side plate 201 by a fixing member 3024, and the clockwork 3025 may be fixedly connected to the rotating shaft 3023 and the drum 301, respectively. In this case, when the lifting mechanism 400 is lifted to control the curtain 100 to be unfolded, the pulling force of the lifting mechanism 400 on the curtain 100 drives the winding drum 301 to rotate, so as to drive the clockwork 3025 to be wound up. Meanwhile, the clockwork 3025 stores elastic potential energy, and after the curtain 100 is unfolded, the pulling force of the lifting mechanism 400 on the curtain 100 is balanced with the rotating force of the clockwork 3025 which causes the winding drum 301 to rotate, so as to ensure that the curtain 100 is kept in the unfolded state. When the lifting mechanism 400 is lowered, the pulling force applied to the curtain 100 by the lifting mechanism 400 is reduced, and at this time, the rotational force of the winding drum 301 by the clockwork 3025 is larger than the pulling force, and the clockwork 3025 releases the elastic potential energy. Thereby causing the winding drum 301 to rotate reversely, and causing the crimpable portion 102 of the curtain sheet 100 to wind on the winding drum 301, so as to achieve the winding up of the curtain sheet 100. For example, the fixing member 3024 may be fixed in the second mounting slot 2013 of the side plate 201, and the spring assembly 3025 may be sleeved on the rotating shaft 3023 fixedly connected to the fixing member 3024. And one end of the clockwork 3025 may be fixed to the mount 3024 and the other end may be fixed to the drum 301.

In the embodiment of the present application, as shown in fig. 9, the lifting mechanism 400 in the projection screen 000 may include: two lifting brackets 403 and two second transmission structures 405, wherein one sides of the two lifting brackets 403 are respectively connected with two ends of the cross beam 401, and the other sides of the two lifting brackets 403 are respectively fixed at two ends of the bottom plate 402 through the two second transmission structures 405. In this case, two second transmission structures 405 and two lifting brackets 403 are arranged in the projection screen 000, and the two lifting brackets 403 and the two second transmission structures 405 are distributed on both sides of the beam 401 along the length direction of the beam 401. In this way, the two second transmission structures 405 and the two lifting brackets 403 are matched, so that the curtain 100 can be stably unfolded and folded. It should be noted that the number of the lifting bracket 403 and the number of the second transmission structures 405 may be one, and the curtain sheet 100 may be unfolded and folded, which is not specifically limited in the embodiment of the present application.

In summary, an embodiment of the present application provides a projection screen, which may include: the curtain piece, base, curling mechanism and elevating system. The winding drum in the winding mechanism can wind the crimpable part in the curtain sheet on the winding drum, and the beam in the lifting mechanism can unwind the crimpable part wound on the winding drum. And when projection pictures need to be projected on the curtain sheet, after the lifting mechanism expands the curled part wound on the winding drum through the cross beam, the supporting surface in the cross beam can be in close contact with the deformed part in the curtain sheet, and the supporting surface in the cross beam can provide certain supporting force for the deformed part, so that the probability of the bad phenomenon of curling or internal unevenness of the deformed part area in the curtain sheet is reduced, and the display effect of the projection pictures on the curtain sheet is better. In addition, after the curtain piece expandes, elevating system can apply the effort that deviates from the reel direction to the curtain piece through the crossbeam, and the curling mechanism can apply the effort that deviates from the crossbeam direction to the curtain piece through the reel, through the effort of these two directions for the curtain piece can the tensioning, has guaranteed that the holistic roughness of curtain piece is better.

The embodiment of the application also provides a laser projection system which can be an ultra-short-focus laser projection system. For example, please refer to fig. 13, and fig. 13 is a schematic structural diagram of a laser projection system according to an embodiment of the present disclosure. The laser projection system may include: a projection screen 000 and a laser projection device 001. The projection screen 000 may be the projection screen shown in any of the above embodiments.

As such, when the laser projection apparatus 001 operates, the laser projection apparatus 001 may not only emit light obliquely upward, so that the laser projection apparatus 001 may project a picture to the projection screen 000.

In an embodiment of the present application, please refer to fig. 14 in the embodiment of the present application, and fig. 14 is a schematic partial structural diagram of a laser projection system provided in the embodiment of the present application. The laser projection apparatus 001 may further include: a projection host (not shown in the figure) and a storage part 0011, wherein the storage part 0011 is used for storing the projection host and the projection screen 000. The storage portion 0011 may have a light-transmitting area b2 and an opening b3, a light beam emitted from the projection host can pass through the light-transmitting area b2, and the lifting mechanism 400 can control the curtain sheet 100 to pass through the opening b3 and be unfolded. In this way, when the laser projection apparatus 001 is not used, the projection host and the projection screen 000 are housed in the housing portion 0011, which is convenient for saving space. When the laser projection apparatus 001 is in use, the lifting mechanism 400 controls the screen 100 to be unfolded, and the projection host projects a light beam onto the screen 100, so that the screen displays a projection picture.

The vertical distance from the center point of the light-transmitting area b2 to the plane of the developed screen 100 is equal to the product of the projection ratio of the projection host and the width of the display area on the screen 100, and the width of the display area refers to the size of the display area along the horizontal direction. Therefore, the light beam emitted by the projection host can be accurately projected to the display area of the screen 100, so that the definition of the projection picture on the screen 100 is ensured.

Since the throw ratio is a performance parameter of the projection host, the throw ratio of the projection host is related to the selected projection host, that is, the throw ratio is different when different projection hosts are selected, and further the vertical distance from the central point of the light-transmitting area to the plane where the expanded screen is located is different. Therefore, in the actual setting process, the vertical distance from the central point of the light-transmitting area to the plane where the expanded screen is located is calculated through the projection ratio of the projection host and the width of the display area, so that the light beam emitted by the projection host can be completely projected in the display area of the screen.

Optionally, the projection host may be an ultra-short focus projection host, and the ultra-short focus projection host may be a DLP (Digital Light processing) projection host. In this way, the distance between the projection host and the plane of the projection screen 000 is set to be short, so that the miniaturization design of the whole projection device is realized. The projection host may include: a light source, an optical engine and a lens (not shown). The light source is used for emitting light beams to the optical machine.

The light engine may include: the Digital Micromirror Device (DMD) comprises a Digital Micromirror array (DMD) and a drive circuit board electrically connected with the DMD, wherein the drive circuit board in the optical machine is used for providing a drive signal for the DMD. The DMD can modulate the light beam emitted from the light source based on the driving signal, emit the modulated light beam to the lens, and emit the light beam to the screen in the projection screen 000 through the lens, so that the screen 100 can present a projection picture. For example, the projection host includes a lens that is an ultra-short-focus projection lens.

The screen 100 in the projection screen 000 may be an optical screen, such as a flexible fresnel optical screen, or may also be a flexible black screen, and such an optical screen has a higher optical gain compared to a conventional screen, can reduce the brightness and contrast of a light beam as much as possible, and can be controlled and stretched by the lifting mechanism 800 to achieve a higher flatness, which can be suitable for an ultra-short focus projection imaging application.

In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The above description is intended to be exemplary only, and not to limit the present application, and any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included therein.

Claims (10)

1. A projection screen, comprising: the device comprises a curtain sheet, a base, a curling mechanism and a lifting mechanism;

the curtain sheet includes: a planar portion and a crimpable portion, and a deformation portion between the planar portion and the crimpable portion;

the curling mechanism is fixed on the base and comprises a reel, one side of the crimpable part, which faces away from the plane part, is fixedly connected with the reel, and the crimpable part can be wound on the reel;

the lifting mechanism is fixed on the base and comprises a cross beam, the cross beam is provided with a supporting surface fixedly connected with the plane part, and the lifting mechanism is configured to: controlling unwinding of the crimpable portion wound on the bobbin by the cross member;

wherein the support surface is used for providing a support force for the deformation part.

2. The projection screen of claim 1 wherein after the lift mechanism unwinds the rollable portion wound on the spool via the beam, an orthographic projection of the deformed portion on the support surface is located within a region of the support surface.

3. The projection screen of claim 1 wherein the spool is arranged adjacent to the beam after the rollable portion is fully wound onto the spool.

4. The projection screen of claim 3, wherein the base comprises: the winding drum is positioned between the two side plates, and two ends of the winding drum are respectively movably connected with first ends of the two side plates;

the lifting mechanism further comprises: the lifting support is positioned between the cross beam and the bottom plate, two ends of the bottom plate are fixedly connected with second ends of the two side plates respectively, and two sides of the lifting support are connected with the bottom plate and the cross beam respectively.

5. The projection screen of claim 4 wherein the curling mechanism further comprises: the driving assembly is fixed on the side plate and connected with the winding drum;

wherein the drive assembly is configured to: the winding drum is driven to rotate, and the crimpable part is wound on the winding drum.

6. The projection screen of claim 5 wherein the drive assembly comprises: the first driving motor is fixed on the side plate, and the first transmission structure is respectively connected with the first driving motor and the winding drum;

alternatively, the drive assembly comprises: pivot, mounting and clockwork spring device, the reel cup joints in the pivot and with pivot swing joint, the pivot passes through the mounting is fixed on the curb plate, clockwork spring device respectively with the pivot with the reel is connected.

7. The projection screen of claim 4, wherein the lift mechanism further comprises: the second driving motor is fixed on the bottom plate, and the second transmission structure is connected with the second driving motor and the lifting support respectively.

8. The projection screen of claim 7, wherein the lifting mechanism comprises two lifting brackets and two second transmission structures, one side of each lifting bracket is connected to two ends of the beam, and the other side of each lifting bracket is fixed to two ends of the bottom plate through the two second transmission structures.

9. A laser projection system, comprising: a projection screen and a laser projection device, the projection screen being a projection screen according to any one of claims 1 to 8 above.

10. The laser projection system of claim 9, wherein the laser projection device comprises: a projection host and a housing configured to: accommodating the projection screen and the projection host;

the accommodating part is provided with an opening and a light-transmitting area, light beams emitted by the projection host can penetrate through the light-transmitting area to irradiate the screen, and the lifting mechanism in the projection screen can control the screen to penetrate through the opening and expand.

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