CN116165835A

CN116165835A - Projection screen

Info

Publication number: CN116165835A
Application number: CN202111403278.XA
Authority: CN
Inventors: 陈友才; 李明; 杨长明; 朱克喜; 戚广亮
Original assignee: Dalian University of Technology; Qingdao Hisense Laser Display Co Ltd
Current assignee: Dalian University of Technology; Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2023-05-26

Abstract

The application discloses a projection screen belongs to projection technical field. The projection screen includes: curtain piece, holding portion and support piece. The accommodating part is positioned at the back of the curtain sheet and is connected with the back of the curtain sheet, the accommodating part is provided with a cavity, and the supporting piece is positioned in the cavity. The rigidity of support piece is greater than the rigidity of curtain piece, can carry out effectual support to the curtain piece through a plurality of support pieces to the probability of edge curling or inside uneven bad phenomenon take place for the curtain piece has been reduced after expansion and packing up many times for the curtain piece. In addition, the support piece can move in the cavity of the accommodating part. In an environment where the projection screen is at a high temperature, the curtain sheet will not be distorted by being constrained by the support member even if the curtain sheet is heated/wet expanded to a much greater extent than the support member. In order to guarantee that support piece can play effectual support to the curtain piece, and then can guarantee that the positive roughness of curtain piece is better, the effectual probability that reduces projection picture on the curtain piece and appear bad problems such as distortion.

Description

Projection screen

Technical Field

The present disclosure relates to the field of projection technologies, and in particular, to a projection screen.

Background

With the continuous development of technology, projection devices are increasingly used in people's work and life. Currently, projection devices mainly include a projection host and a projection screen. The light outlet side of the projection host faces the projection screen to emit light beams to the projection screen, and the projection screen is used for reflecting the light beams so as to display pictures.

Projection screens generally comprise: curtain piece, crimping mechanism and elevating system. One side of the curtain sheet is connected with the curling mechanism, and the other side is connected with the lifting mechanism. The curtain sheet can be retracted by controlling the curling mechanism, and can be unfolded by controlling the lifting mechanism.

However, after the curtain sheet is unfolded and folded for many times, the curtain sheet is very easy to generate edge curling or internal uneven bad phenomena, so that the bad problems of distortion and the like of a projection picture presented on the curtain sheet are caused, and the display effect of the projection picture on the curtain sheet is further caused to be poor.

Disclosure of Invention

The embodiment of the application provides a projection screen. The problem that the display effect of the projection picture displayed on the projection screen sheet in the prior art is poor can be solved, and the projection screen provided by the application can be freely unfolded and folded, and has good reliability in application scenes such as high and low temperature, hot flashes, aging and the like. The technical scheme is as follows:

there is provided a projection screen comprising:

the curtain sheet, the accommodating part and the supporting piece;

the accommodating part is positioned on the back surface of the curtain sheet and is connected with the back surface of the curtain sheet, the accommodating part is provided with a plurality of cavities, and the cavities are distributed along the curling direction of the curtain sheet;

The number of the supporting pieces is multiple, the supporting pieces are in one-to-one correspondence with the cavities, and each supporting piece is positioned in the corresponding cavity;

wherein the support piece is movable in the cavity of the accommodating part.

The beneficial effects that technical scheme that this application embodiment provided include at least:

a projection screen, comprising: curtain piece, holding portion and support piece. The accommodating part is positioned at the back of the curtain sheet and is connected with the back of the curtain sheet, the accommodating part is provided with a cavity, and the supporting piece is positioned in the cavity of the accommodating part. Because the rigidity of support piece is greater than the rigidity of curtain piece, can carry out effectual support to the curtain piece through a plurality of support pieces to the probability that edge curling or inside unevenness's bad phenomenon take place for the curtain piece has been reduced after expansion and packing up many times to the curtain piece. In addition, the support piece can move in the cavity of the accommodating part. Therefore, even if the curtain sheet is heated/wet expanded to a degree greater than that of the support member in an environment where the projection screen is at a high temperature, the heated/wet expanded curtain sheet will not be distorted by being restrained by the support member. Moreover, the supporting piece can be pressed on the back of the curtain sheet through the accommodating part, so that the supporting piece can play an effective supporting role on the curtain sheet, the front flatness of the curtain sheet can be guaranteed to be good, and the probability of distortion and other adverse problems of a projection picture presented on the front of the curtain sheet is effectively reduced. The projection screen on the curtain sheet has better display effect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a top view of a projection screen of the related art;

FIG. 2 is a side view of the projection screen shown in FIG. 1;

FIG. 3 is an effect diagram of a rectilinear cursor image presented when the curtain sheet shown in FIG. 1 is not thermally expanded;

FIG. 4 is an effect diagram of a rectilinear cursor image presented by the curtain sheet shown in FIG. 1 when it is expanded by heat;

FIG. 5 is a top view of a projection screen provided in an embodiment of the present application;

FIG. 6 is a schematic view of a partial structure of the projection screen shown in FIG. 5;

FIG. 7 is an effect diagram of a linear cursor image presented when the curtain sheet shown in FIG. 5 is not thermally expanded;

FIG. 8 is an effect diagram of a rectilinear cursor image presented by the curtain sheet shown in FIG. 5 when it is expanded by heat;

FIG. 9 is a side view of another projection screen provided in an embodiment of the present application;

FIG. 10 is a schematic view of a partial structure of the projection screen shown in FIG. 9;

FIG. 11 is a side view of yet another projection screen shown in an embodiment of the present application;

FIG. 12 is a top view of yet another projection screen provided in an embodiment of the present application;

FIG. 13 is a side view of a projection screen provided in accordance with another embodiment of the present application;

FIG. 14 is a side view of another projection screen provided in accordance with another embodiment of the present application;

FIG. 15 is a top view of yet another projection screen provided in accordance with another embodiment of the present application;

FIG. 16 is a schematic view of a projection screen according to another embodiment of the present disclosure;

FIG. 17 is a schematic view of the curtain as it is being deployed;

FIG. 18 is a schematic view of a projection device according to an embodiment of the present disclosure;

fig. 19 is a schematic structural view of another projection apparatus according to an embodiment of the present application.

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

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

In the related art, in order to avoid the bad phenomenon that the curtain sheet is very easy to generate edge curling or internal unevenness after the curtain sheet in the projection screen is repeatedly unfolded and folded by the lifting mechanism and the curling mechanism, a plurality of supporting bars can be arranged on the back surface of the curtain sheet.

Referring to fig. 1 and 2, fig. 1 is a top view of a projection screen according to the related art, and fig. 2 is a side view of the projection screen shown in fig. 1. Projection screen 00 can include: a curtain sheet 10, an adhesive layer 20, and a plurality of support bars 30. Wherein, one surface of the bonding layer 20 is connected with the back surface of the curtain sheet 10, and the plurality of supporting bars 30 are bonded with the bonding layer 20 on the back surface of the curtain sheet 10, so as to realize the connection of the plurality of supporting bars 30 and the curtain sheet 10. The plurality of support bars 30 on the back of the curtain sheet 10 are required to be arranged in an array according to the curling direction of the curtain sheet 10, so that the probability of occurrence of edge curling or internal unevenness of the curtain sheet 10 can be reduced by supporting the curtain sheet 10 through the plurality of support bars 30.

However, the support bar 30 has a thermal/wet expansion coefficient much smaller than that of the curtain sheet 10, for example, when the support member 30 is a carbon fiber sheet, the thermal expansion coefficient of the carbon fiber sheet is generally 0.57 microstrain/degree, and the thermal expansion coefficient of the curtain sheet 10 is generally 60 microstrain/degree. Thus, when the projection screen 00 is in a relatively high temperature environment, the curtain sheet 10 in the projection screen 00 expands to a much greater extent than the support bar 30 expands to. When the curtain sheet 10 is connected with the supporting strips 30 in an adhesive manner, after the curtain sheet 10 is heated and expanded, a plurality of supporting strips 30 with smaller expansion degree are applied with pressure, so that the supporting strips 30 are buckled and deformed, and the flatness of the front surface of the curtain sheet 10 adhered with the supporting strips 30 is poor. The projection screen presented on the front surface of the screen 10 still has the problem of distortion and the like, so that the display effect of the projection screen on the screen 10 is poor.

For example, referring to fig. 3 and 4, fig. 3 is an effect diagram of a linear cursor image shown in fig. 1 when the curtain sheet is not expanded by heat, and fig. 4 is an effect diagram of a linear cursor image shown in fig. 1 when the curtain sheet is expanded by heat. When the projection screen 00 is not expanded by heat, each supporting bar 30 can effectively support the screen 10, so that the flatness of the front surface of the screen 10 is better, and the cursor image 40 displayed on the screen 10 is not obviously distorted. When the projection screen 00 is heated and expanded, each supporting bar 30 is driven by the heated and expanded curtain sheet 10 to form buckling deformation, so that the flatness of the front surface of the curtain sheet 10 is poor, and the cursor image 40 presented on the curtain sheet 10 is obviously distorted.

Referring to fig. 5 and 6, fig. 5 is a top view of a projection screen according to an embodiment of the present application, and fig. 6 is a schematic partial structure of the projection screen shown in fig. 5. Projection screen 000 can include: the curtain sheet 100, the receiving portion 200, and the supporter 300.

The receiving portion 200 in the projection screen may be located at the rear surface of the screen sheet 100 and connected to the rear surface of the screen sheet 100. The receiving portion 200 may have a plurality of cavities a1, and the plurality of cavities a1 may be arranged along the curling direction of the curtain sheet 100.

The supporting members 300 in the projection screen may be strip-shaped supporting bars, the number of the supporting members 300 may also be plural, the plurality of supporting members 300 may correspond to the plurality of cavities a1 in the accommodating portion 200 one by one, and each supporting member 300 may be located in the corresponding cavity a 1. Wherein, only contact relation exists between the supporting piece 300 and the curtain sheet 100, and no connection relation exists; only a contact relationship exists between the supporter 300 and the receiving portion 200, and no connection relationship exists. That is, the supporter 300 may be movable within the cavity a1 of the receiving portion 200. In this way, the plurality of supporters 300 can be supported by the plurality of cavities a1 in the accommodating portion 200, and the plurality of supporters 300 can be disposed on the rear surface of the curtain sheet 100 by the plurality of cavities a1 in the accommodating portion 200.

In the embodiment of the present application, when the cavities a1 in the receiving portion 200 are arranged along the curling direction of the curtain sheet 100, the plurality of supporting pieces 300 positioned in the cavities a1 are also arranged along the curling direction of the curtain sheet 100. And, the rigidity of the support 300 is greater than that of the curtain sheet 100. In this way, the curtain sheet 100 can be effectively supported by the plurality of supporting members 300, thereby reducing the probability of the curtain sheet 100 having an edge curl or internal unevenness after the curtain sheet 100 is repeatedly unfolded and folded.

Moreover, since the supporting member 300 has only a contact relationship with the curtain sheet 100 and the receiving portion 200, there is no connection relationship. Therefore, in an environment where the projection screen 000 is at a high temperature/humidity, even if the curtain sheet 100 is heated/wet-expanded to a much greater extent than the support 300, the heated/wet-expanded curtain sheet 100 is not distorted by being constrained by the support 300. Moreover, the supporting piece 300 can be pressed on the back of the curtain sheet 100 through the accommodating part 200, so that the supporting piece 300 can effectively support the curtain sheet 100, the front flatness of the curtain sheet 100 can be ensured to be good, and the probability of poor problems such as distortion and the like of a projection picture presented on the front of the curtain sheet 100 is effectively reduced.

For example, referring to fig. 7 and 8, fig. 7 is an effect diagram of a linear cursor image presented when the curtain sheet shown in fig. 5 is not expanded by heat, and fig. 8 is an effect diagram of a linear cursor image presented when the curtain sheet shown in fig. 5 is expanded by heat. When the curtain sheet 100 is not expanded by heat, each supporting member 300 can effectively support the curtain sheet 100, so as to ensure that the front surface of the curtain sheet 100 has better flatness. A long cursor image A1 is projected on the screen sheet 100 in a direction perpendicular to the longitudinal direction of the support 300, and the long cursor image A1 is not significantly distorted. When the curtain sheet 100 is heated/wet expanded, even if the degree of the thermal/wet expansion of the curtain sheet 100 is far greater than the degree of the thermal/wet expansion of the supporting member 300, the curtain sheet 100 after the thermal/wet expansion will not be distorted due to the constraint of the supporting member 300, and the supporting member 300 can be pressed on the back surface of the curtain sheet 100 by the accommodating portion 200, so as to ensure that the supporting member 300 can effectively support the curtain sheet 100, and further ensure that the flatness of the front surface of the curtain sheet 100 is better, the long cursor image A1 is projected on the curtain sheet 100 along the direction perpendicular to the length direction of the supporting member 300, and the long cursor image A1 also has no obvious distortion.

In summary, the embodiments of the present application provide a projection screen, which may include: curtain piece, holding portion and support piece. The accommodating part is positioned at the back of the curtain sheet and is connected with the back of the curtain sheet, the accommodating part is provided with a cavity, and the supporting piece is positioned in the cavity of the accommodating part. Because the rigidity of support piece is greater than the rigidity of curtain piece, can carry out effectual support to the curtain piece through a plurality of support pieces to the probability that edge curling or inside unevenness's bad phenomenon take place for the curtain piece has been reduced after expansion and packing up many times to the curtain piece. In addition, the support piece can move in the cavity of the accommodating part. Therefore, even if the curtain sheet is heated/wet expanded to a much greater extent than the support member is heated/wet expanded in an environment where the projection screen is at a higher temperature, the heated/wet expanded curtain sheet will not be distorted by being constrained by the support member. Moreover, the supporting piece can be pressed on the back of the curtain sheet through the accommodating part, so that the supporting piece can play an effective supporting role on the curtain sheet, the front flatness of the curtain sheet can be guaranteed to be good, and the probability of distortion and other adverse problems of a projection picture presented on the front of the curtain sheet is effectively reduced. The projection screen on the curtain sheet has better display effect.

In the embodiment of the present application, there are various structures of the accommodating portion 200 in the projection screen 000, and the embodiment of the present application will be described by taking the following two alternative implementation manners as examples.

Referring to fig. 9 and 10, fig. 9 is a top view of another projection screen according to an embodiment of the present application, and fig. 10 is a schematic partial structure of the projection screen shown in fig. 9. The receiving part 200 in the projection screen 000 may include: an adhesive portion 201 and a connecting portion 202.

The number of the adhesive parts 201 in the accommodating part 200 may be plural, the plurality of adhesive parts 201 may be located on the rear surface of the curtain sheet 100 in the projection screen 000, and the plurality of adhesive parts 201 may be stripe-shaped and may be connected to the rear surface of the curtain sheet 100. The plurality of adhesive portions 201 may be arranged in the curling direction of the curtain sheet 100.

The connection portion 202 in the projection screen 000 may be adhered to a side of the plurality of adhesive portions 201 remote from the screen sheet 100. In this case, each two adjacent bonding portions 201 and connecting portions 202 can constitute one cavity a1.

The supporting member 300 may be located in the cavity a1 formed by the two adjacent bonding portions 201 and the connecting portion 202, and the supporting member 300 may move in the cavity a1 of the accommodating portion 200. That is, only a contact relationship exists between the supporter 300 and the curtain sheet 100, and no connection relationship exists; only contact relation exists between the supporting piece 300 and the bonding part 201, and no connection relation exists; there is only a contact relationship between the support 300 and the connection portion 202, and no connection relationship.

The number of the supporting members 300 in the projection screen 000 may be one less than the number of the adhesive portions 201. Thus, when the number of the bonding portions 201 is three or more, one supporting member 300 may be arranged in one cavity a1 formed by each two adjacent bonding portions 201 and the connecting portion 202. The following embodiments are each schematically described with the number of the bonding portions 201 being three or more and the number of the supporting members 300 being two or more.

In the embodiment of the present application, when the plurality of adhesive portions 201 are arranged in the curling direction of the curtain sheet 100, the plurality of supporting members 300 are also arranged in the curling direction of the curtain sheet 100. And, the rigidity of the support 300 is greater than that of the curtain sheet 100. In this way, the curtain sheet 100 can be effectively supported by the plurality of supporting members 300, thereby reducing the probability of the curtain sheet 100 having an edge curl or internal unevenness after the curtain sheet 100 is repeatedly unfolded and folded.

Further, since the supporting member 300 has only a contact relationship with the screen sheet 100, the bonding portion 201, and the connecting portion 202, there is no connection relationship. Therefore, in an environment where the projection screen 000 is at a high temperature/humidity, even if the curtain sheet 100 is heated/wet-expanded to a much greater extent than the support 300, the heated/wet-expanded curtain sheet 100 is not distorted by being constrained by the support 300. Moreover, the supporting piece 300 can be pressed on the back of the curtain sheet 100 through the connecting portion 202, so that the supporting piece 300 can effectively support the curtain sheet 100, the front flatness of the curtain sheet 100 can be guaranteed to be good, and the probability of poor problems such as distortion and the like of a projection picture presented on the front of the curtain sheet 100 is effectively reduced.

For example, when the curtain sheet 100 is not thermally expanded, each supporting member 300 can effectively support the curtain sheet 100, so as to ensure that the front surface of the curtain sheet 100 has better flatness. Referring to fig. 7, a long cursor image A1 is projected on the screen sheet 100 in a direction perpendicular to the longitudinal direction of the supporter 300, and the long cursor image A1 is not significantly distorted. When the curtain sheet 100 is heated/wet expanded, even if the degree of the thermal/wet expansion of the curtain sheet 100 is far greater than the degree of the thermal/wet expansion of the supporting member 300, the curtain sheet 100 after the thermal/wet expansion will not be distorted due to the constraint of the supporting member 300, and the supporting member 300 can be pressed on the back surface of the curtain sheet 100 by the connecting portion 202, so as to ensure that the supporting member 300 can effectively support the curtain sheet 100, and further ensure that the flatness of the front surface of the curtain sheet 100 is better, and a long cursor image A1 is projected on the curtain sheet 100 along the direction perpendicular to the length direction of the supporting member 300, and referring to fig. 8, the long cursor image A1 also has no obvious distortion.

Optionally, referring to fig. 11, fig. 11 is a side view of a projection screen according to an embodiment of the present application. Projection screen 000 can further include: the protective film 400, the protective film 400 may be positioned on the back surface of the curtain sheet 100 and connected to the back surface of the curtain sheet 100. The protective film 400, the connecting portion 202, and two adjacent bonding portions 201 may form a cavity a1. The support 300 may be located within the cavity a1, and the support 300 may move within the cavity a1. That is, only a contact relationship exists between the supporter 300 and the curtain sheet 100, and no connection relationship exists; only contact relation exists between the supporting piece 300 and the bonding part 201, and no connection relation exists; only contact relation exists between the supporting piece 300 and the connecting part 202, and no connection relation exists; only contact relationship exists between the support 300 and the protective film 400, and no connection relationship exists. It should be noted that, in order to ensure that the projection screen 000 can be curled conveniently, the thickness of the protective film 400 needs to be made small. In this application, the protective film 400 may be formed on the back surface of the curtain sheet 100 by an adhesive or spray process. For example, the PET film may be bonded to the back surface of the curtain sheet 100; the protective film 400 may be formed on the back surface of the curtain sheet 100 by spraying a mixture of metal powder and optical cement. In this way, the probability of the support 300 scratching the curtain sheet 100 can be effectively reduced. And the light reflecting property of the rear surface of the screen sheet 100 to the light projected onto the screen sheet 100 can be increased.

In the embodiment of the present application, the absolute value of the ratio of the difference between the thickness of the bonding portion in the projection screen 000 and the thickness of the support 300 to the thickness of the support 300 ranges below 50%, that is, the thickness of the support 300 in the projection screen 000 may be slightly greater than or equal to the thickness of the bonding portion 201, and the thickness of the support 300 may also be slightly less than the thickness of the bonding portion 201. In this way, when the supporting member 300 is located in the cavity a1 formed by the two adjacent bonding portions 201 and the connecting portion 202, the supporting member 300 can be ensured to be always in contact with the back surface of the curtain sheet 100, so as to ensure that the flatness of the curtain sheet 100 is better.

In the first possible case, referring to fig. 11, when the thickness of the supporting member 300 in the projection screen 000 is equal to the thickness of the bonding portion 201, it is possible to ensure that the flatness of the connection portion 202 connected to the side of the bonding portion 201 away from the curtain sheet 100 is high while ensuring that the supporting member 300 always contacts the curtain sheet 100.

In this case, the connection portion 202 may be made of a hard material or a soft material. When the connection portion 202 is made of hard material, the connection portion 202 may be a sheet structure made of polyethylene terephthalate (english: polyethylene Terephthalate, abbreviated as PET) material; when the connection portion 202 is made of a soft material, the connection portion 202 may be a soft cloth. In order to ensure that the connection portion 202 is in coordination with the deformation of the curtain sheet 100, the connection portion 202 is selected to have a tensile modulus and a thermal/wet expansion coefficient as close as possible to those of the curtain sheet 100. And in order to ensure that the projection screen 000 can be curled conveniently, the thickness of the connection portion 202 should be made small.

In a second possible scenario, please refer to fig. 12, fig. 12 is a side view of yet another projection screen shown in an embodiment of the present application. When the thickness of the support 300 in the projection screen 000 is slightly greater than the thickness of the adhesive portion 201, the connection portion 202 in the projection screen 000 may be a structure made of a soft material. By way of example, the connecting portion 202 may be a structure made of soft cloth, or may be made of other materials, which is not limited in this embodiment.

In this case, since the thickness of the supporting member 300 is slightly greater than the thickness of the bonding portion 201, that is, a level difference exists between a side of the supporting member 300 away from the curtain sheet 100 and a side of the bonding portion 201 away from the curtain sheet 100, when the connecting portion 202 is made of a softer material, the connecting portion 202 can be still connected with a side of the bonding portion 201 away from the curtain sheet 100 with a good effect of eliminating the level difference. In addition, a certain force can be applied to the supporting member 300 through the connection portion 202, so as to ensure that the supporting member 300 can better support the curtain sheet 100.

In the third possible case, when the thickness of the supporting member 300 in the projection screen 000 is slightly smaller than the thickness of the adhesive portion 201, the curtain sheet 100 after thermal/wet expansion is not distorted by being restrained by the supporting member 300, also on the premise that the supporting member 300 is always in contact with the back surface of the curtain sheet 100.

When the above three conditions are referred to, it is possible to avoid wrinkles or deformations of the curtain sheet 100 due to the difference in thickness between the bonding portion 201 and the supporting member 300 after the curtain sheet 100 is curled, which is more advantageous for protecting the curtain sheet 100 and further ensuring a good projection effect.

In the embodiment of the present application, as shown in fig. 11 and 12, the connection portion 202 in the projection screen 000 may have a plurality of slits 2021, and the plurality of slits 2021 may correspond to the plurality of adhesive portions 201 one by one, and the orthographic projection of each slit 2021 on the screen 100 may be located within the orthographic projection range of each adhesive portion 201 corresponding to each slit 2021 on the screen 100. For example, the orthographic projection of the slit 2021 on the corresponding adhesive portion 201 is located at the center position in the longitudinal direction of the adhesive portion 201. Wherein, the length of each slit 2021 of the plurality of slits 2021 may be equal to the width of the connection portion 202 in the curling direction perpendicular to the curtain sheet 100. In this case, the plurality of slits 2021 in the connecting portion 202 can reduce the difficulty in crimping the connecting portion 202, ensuring that the connecting portion 202 is crimped in synchronization with the screen 100. And the curl radius of the curtain sheet 100 is small, so that the space requirement of the curtain sheet 100 in a non-use state is reduced, and the storage and the transportation are facilitated. It should be noted that, when the connecting portion 202 is of an integral structure, in order to ensure that the curtain sheet 100 can be curled well, the connecting portion 202 should have a good tensile property; when the connection portion 202 has a discontinuous structure having the slit 2021, in order to ensure that the curtain sheet 100 can be curled well, the connection portion 202 may be made of a material having a good stretchability, or may be made of a material having a general stretchability, which is not limited in the embodiment of the present application.

For example, after the connection portion 202 of the whole sheet is connected to the plurality of adhesive portions 201, the connection portion 202 of the whole sheet may be cut into a plurality of separated sub-connection portions b1 using a cutting process, such that a gap 2021 exists between two adjacent sub-connection portions b 1.

Alternatively, the plurality of adhesive parts 201 in the projection screen 000 may have a stripe structure with a glue, and the adhesive parts 201 may be adhered to the rear surface of the screen sheet 100 and may be adhered to the surface of the connection part 202 adjacent to the screen sheet. The thermal/wet expansion coefficients of the plurality of adhesive portions 201 should be as same as those of the curtain sheet 100 as possible to prevent the thermal/wet expansion coefficients of the adhesive portions 201 from being greatly different from those of the curtain sheet 100, resulting in poor flatness of the curtain sheet 100. For example, first, the adhesive portion 201 is adhered to the curtain sheet 100 on the side having the adhesive; then, the connecting part 202 and one surface of the bonding part 201 far away from the curtain sheet 100 are bonded, and the connecting part 202 and two adjacent colloids form a cavity a1; next, the supporter 300 is disposed in the cavity a 1. For example, the adhesive portion 201 may be a double-sided adhesive tape having a certain thickness. In this case, the installation process of the adhesive portion 201, the connection portion 202, and the support 300 on the screen sheet 100 can be effectively simplified.

Alternatively, referring to fig. 13, fig. 13 is a side view of another projection screen according to another embodiment of the present application. When the adhesive portion 201 is in a strip-like structure with a glue, the side surface of the adhesive portion 201 also has a certain viscosity. In order to separate the adhesive portion 201 from the support 300, it is necessary to provide an adhesion-suppressing layer 203 on the side surface of the adhesive portion 201 or the support 300. The adhesion of the side surface of the adhesion portion 201 can be reduced by the adhesion-suppressing layer 203, and it is ensured that the adhesion portion 201 can be separated from the support 300 by the adhesion-suppressing layer 203.

For example, when the adhesive portion 201 is a strip-shaped structure with glue, if a double-sided tape having a certain thickness is selected as the adhesive portion 201, the assembly process of the curtain sheet 100, the adhesive portion 201, the supporting member 300 and the connecting portion 202 is as follows:

first, one surface of the adhesive portion 201 is adhered to the back surface of the screen sheet 100, and the adhesive portion 201 is provided with a separator on a surface opposite to the surface to which the screen sheet 100 is adhered.

Next, the adhesive portion 201 having the release film is subjected to a paint spraying process to form an adhesion-suppressing layer 203 on the adhesive portion 201, wherein the adhesion-suppressing layer 203 may be a suppressing layer formed by a sprayed matt paint, or may be another film layer having an adhesion-suppressing effect, which is not limited in the embodiment of the present application. In this way, the release film can effectively prevent the sprayed material from being sputtered onto the surface of the gel facing the surface to which the curtain sheet 100 is adhered, and thus the adhesive performance of the surface is deteriorated.

Finally, the supporting member 300 is placed between two adjacent bonding portions 201, the isolation film on the opposite surface of the colloid to the surface to which the curtain sheet 100 is bonded is removed, and the connection portion 202 is bonded to the bonding portions 201, so that the connection portion 202 and the two adjacent bonding portions 201 constitute a cavity a1. In this way, the adhesion-suppressing layer 203 can effectively prevent the side surface of the adhesion portion 201 from adhering to the support 300 during the rolling of the screen sheet 100.

In the embodiment of the present application, the length direction of each cavity a1 formed by two adjacent adhesive portions 201 and connecting portions 202 in the accommodating portion 200 is perpendicular to the curling direction of the curtain sheet 100, and the distance between every two adjacent cavities a1 is equal. That is, the longitudinal direction of each of the plurality of adhesive portions 201 is perpendicular to the curling direction of the screen sheet 100. And the distance between every two adjacent bonding portions 201 may be equal. In this way, it is possible to ensure that the distances between the plurality of supports 300 are approximately equal. Thus, after the curtain sheet 100 is heated/wet expanded, the supporting force of the supporting member 300 to the curtain sheet 100 is uniformly distributed on the curtain sheet 100, preventing the curtain sheet 100 from being greatly thermally deformed. The distances between every two adjacent bonding portions 201 may be unequal, so that when the curtain sheet 100 is in a curled state, it is possible to ensure that the plurality of support members 300 are aligned with each other in adjacent turns (i.e., in a ring-like structure formed when the curtain sheet 100 is curled) when the curtain sheet 100 is curled, thereby avoiding the introduction of residual stress by misalignment.

Referring to fig. 14, fig. 14 is a side view of a projection screen according to another embodiment of the present application. The receiving part 200 in the projection screen may include: the plurality of protrusions 200a, the plurality of protrusions 200a may be in a bar shape, the plurality of protrusions 200a may be arranged along the curling direction of the curtain sheet 100, each protrusion 200a has at least one cavity a1, and the plurality of cavities a1 in the plurality of protrusions 200a are arranged along the curling direction of the curtain sheet 100. In this application, the length direction of the cavity a1 may be perpendicular to the curling direction of the curtain sheet 100. Each cavity a1 in the boss 200a has one support 300 therein, and the support 300 is movable in the cavity a1. In this application, the projection screen may further include: the protective film 400, the protective film 400 may be located at the rear surface of the curtain sheet 100 and connected with the rear surface of the curtain sheet 100, and one side of the protective film 400 away from the curtain sheet 100 is connected with the plurality of protrusions 200 a. Wherein, a side of each protrusion 200a facing the protective film 400 may have at least one bar-shaped groove, and the bar-shaped groove between the protective film 400 and the protrusion 200a is a cavity a1. It should be noted that, the protective film 400 and the plurality of protruding portions 200a may be formed simultaneously by a single injection molding process.

For example, if the protruding portion 200a is selected as the accommodating portion 200, the assembly process of the curtain sheet 100, the protruding portion 200a, the protective film 400 and the supporting member 300 is as follows:

firstly, forming a protruding part and a protective film layer simultaneously through one-time injection molding process, wherein a strip-shaped groove, namely a cavity is formed between the protruding part and the protective film layer, and the protruding part and the protective film layer can be of an integrated structure;

then, arranging the strip-shaped supporting piece in the cavity;

and finally, adhering the convex part of the integrated structure and the protective film layer to the back surface of the curtain sheet.

Alternatively, the length direction of each of the cavities a1 in the plurality of bosses 200a is perpendicular to the curling direction of the curtain sheet 100, and the distance between every two adjacent cavities a1 is equal. That is, the distance between every two adjacent bosses 200a may be equal. In this way, it is possible to ensure that the distances between the plurality of supports 300 are approximately equal. Thus, after the curtain sheet 100 is heated/wet expanded, the supporting force of the supporting member 300 to the curtain sheet 100 is uniformly distributed on the curtain sheet 100, preventing the curtain sheet 100 from being greatly thermally deformed. In this application, the distance between every two adjacent protrusions 200a may be unequal, which is not limited in this embodiment of the present application.

In an embodiment of the present application, please refer to fig. 15, fig. 15 is a top view of a projection screen according to another embodiment of the present application. Projection screen 000 can further include: two sealing strips 500. Wherein, two sealing strips 500 are connected with the back of the curtain sheet 100 in the projection screen 000, the length direction of the sealing strips 500 is perpendicular to the length direction of the cavity a1, and the accommodating portion 200 is arranged between the two sealing strips 500, and the two sealing strips 500 are respectively used for sealing openings of two ends of the cavity a1 in the accommodating portion 200. In this way, the two sealing strips 500 can form a package for the support 300, i.e., can prevent the support 300 from sliding out of the opening of the end of the cavity a 1. For example, the two sealing strips 500 may be glue, that is, the two sealing strips 500 may be fixed to the back of the curtain sheet 100 by means of adhesion, for example, the two sealing strips 500 may be double-sided glue having a certain thickness.

In the present embodiment, the support 300 in the projection screen 000 may be a strip-shaped carbon fiber sheet. Wherein, the thickness h of the carbon fiber sheet may range from 0.1 mm to 4 mm, the width w of the carbon fiber sheet may range from 0.5 mm to 10 mm, and the distance d between any two adjacent carbon fiber sheets may range from 5 mm to 50 mm. In this application, the support 300 in the projection screen 000 may also be a strip structure made of other materials, for example, glass fiber, titanium alloy, or aviation aluminum, which has high tensile modulus and light weight.

In an embodiment of the present application, referring to fig. 13 and 15, the projection screen 000 may further include: the film 600 is decorated. The decorative film layer 600 may be located at a side of the receiving portion 200 remote from the curtain sheet 100. In this application, the decoration film 600 may be formed on the side of the accommodating portion 200 away from the curtain sheet 100 by using a spraying process. The thickness of the decorative film layer 600 should be limited to a small range, such as less than 0.1 mm. For example, the matte paint is sprayed to form the decorative film layer 600 on the side of the accommodating portion 200 away from the curtain sheet 100. Thus, the decorative film layer 600 can encapsulate the back surface of the curtain sheet 100, i.e., can function as a back surface finishing for the curtain sheet 100.

Optionally, referring to fig. 16, fig. 16 is a schematic structural view of a projection screen according to another embodiment of the present application. Projection screen 000 can further include: base 700, lifting mechanism 800, and crimping mechanism 900.

The elevating mechanism 800 in the projection screen 000 is fixed to the base 700, and the elevating mechanism 800 may be fixedly connected to the first side 101 of the screen sheet 100. Wherein the lifting mechanism 800 may be configured to: the curtain sheet 100 is controlled to be spread.

The crimping mechanism 900 in the projection screen 000 can be secured to the base 700, and the crimping mechanism 900 can be fixedly coupled to the second side 102 of the sheet 100. Wherein crimping mechanism 900 may be configured to: the curtain sheet 100 is controlled to retract.

It should be noted that the first side 101 of the curtain sheet 100 and the second side 102 of the curtain sheet 100 may be opposite sides. Thus, when the lifting mechanism 800 is fixedly connected to the first side 101 of the curtain sheet 100 and the curling mechanism 900 is fixedly connected to the second side 102 of the curtain sheet 100, the lifting mechanism 800 can control the curtain sheet 100 to be unfolded, and the curling mechanism 900 can control the curtain sheet 100 to be folded.

Taking the support 300 as an example of a carbon fiber strip, the influence of the carbon fiber strip on the deformation degree of the curtain sheet 100 during rolling and the deformation degree during unfolding will be described based on the thickness h of the carbon fiber strip, the width w of the carbon fiber strip, and the distance d between two adjacent carbon fiber sheets as design variables.

In order to reduce the probability of the curtain sheet 100 having an edge curl or an internal unevenness, the projection screen 000 provided herein includes the curtain sheet 100, the receiving part 200, and the supporting member 300. The accommodating portion 200 is located at the back of the curtain sheet 100 and connected with the back of the curtain sheet 100, the accommodating portion 200 has a plurality of cavities a1, and the supporting member 300 may be located in the cavities a 1.

When the curtain sheet 100 is curled, in order to prevent the curtain sheet 100 from being locally deformed, it is required to ensure a good fit between the curtain sheet 100 and the curling mechanism 900, that is, a small thickness h of the supporting member 300 is required, a small width w of the supporting member 300, and a large distance d between two adjacent supporting members 300. For this purpose, it is necessary to ensure a maximum principal strain ε of the curtain sheet 100 _principal Failure principal strain [ epsilon ] less than curtain sheet 100]At this time, the metal layer failure principal strain in the curtain sheet 100 is selected as the allowable failure principal strain of the curtain sheet 100.

When the screen 100 is unfolded, it is necessary to ensure that the screen projected onto the projection screen 000 by the projection host 001 has a good effect. I.e. a larger thickness h of the support 300 is required, a larger width w of the support 300 and a smaller spacing d between two adjacent supports 300. For this purpose, it is necessary to ensure the maximum value max u of the out-of-plane displacement deformation (maximum displacement of the curtain sheet before and after deformation) of the curtain sheet 100 under the combined action of self gravity and wind pressure ₃ I.e. maximum max u to deform out-of-plane displacement ₃ Minimum is required.

The embodiment of the application aims to illustrate the influence of the width and the thickness of the carbon fiber strips and the distance between two adjacent carbon fiber strips on the maximum value of the out-of-plane displacement deformation of the curtain sheet. Referring to fig. 17, fig. 17 is a schematic view of the curtain sheet when being unfolded. The width w of the carbon fiber strips, the thickness h of the carbon fiber strips and the distance d between two adjacent carbon fiber strips are taken as design variables, and the maximum out-of-plane displacement max u of the curtain sheet 100 in the unfolded state ₃ Minimum is an objective function, and maximum principal strain epsilon of curtain sheet in curled state _principal Less than allowable failure principal strain [ epsilon ] of curtain sheet 100]To optimize the constraint. The optimization problem can be as follows:

find para＝[w，d，g]

min(max u ₃ )

s.t.ε _principai ＜[ε]

wherein the width w of the carbon fiber strips ranges from 0.5 mm to 10 mm, the thickness h of the carbon fiber strips ranges from 0.1 mm to 4 mm, and the distance d between two adjacent carbon fiber strips ranges from 5 mm to 50 mm. The allowable principal strain to failure of the curtain sheet 100 is 0.7% (according to the allowable principal strain to failure=the normal metal failure strain/safety factor, the normal metal failure strain is taken to be 1% in the present application, and the safety factor can be set to be 1.42, and the allowable principal strain to failure can be defined as 0.7%).

For example, according to the gradient (the steepest descent method, etc.) and the non-gradient (the agent model, the population algorithm such as genetic/particle swarm, etc. and the artificial intelligent neural network) algorithm, and the different value ranges of the width w of the carbon fiber strip, the thickness h of the carbon fiber strip and the distance d between two adjacent carbon fiber strips, when the value of the thickness h is 0.22 mm, the value of the width w is 9.64 mm, and the value of the distance d is 16.21 mm, the max u can be obtained ₃ Has a value of 10.16, maximum principal strain ε _principal The value of (2) was 0.693%. Maximum principal strain ε _principal The value of (2) is less than 0.693%. Thus, h is 0.22 mm, width w is 9.64 mm, and distance d is 16.21 mm, which is a set of possible solutions.

In summary, the embodiments of the present application provide a projection screen, which may include: curtain piece, holding portion and support piece. The accommodating part is positioned at the back of the curtain sheet and is connected with the back of the curtain sheet, the accommodating part is provided with a cavity, and the supporting piece is positioned in the cavity of the accommodating part. Because the rigidity of support piece is greater than the rigidity of curtain piece, can carry out effectual support to the curtain piece through a plurality of support pieces to the probability that edge curling or inside unevenness's bad phenomenon take place for the curtain piece has been reduced after expansion and packing up many times to the curtain piece. In addition, the support piece can move in the cavity of the accommodating part. Therefore, even if the curtain sheet is heated/wet expanded to a much greater extent than the support member is heated/wet expanded in an environment where the projection screen is at a higher temperature, the heated/wet expanded curtain sheet will not be distorted by being constrained by the support member. Moreover, the supporting piece can be pressed on the back of the curtain sheet through the accommodating part, so that the supporting piece can play an effective supporting role on the curtain sheet, the front flatness of the curtain sheet can be guaranteed to be good, and the probability of distortion and other adverse problems of a projection picture presented on the front of the curtain sheet is effectively reduced. The projection screen on the curtain sheet has better display effect. The connecting part can be of a flexible and stretchable integral structure or a discontinuous structure containing gaps, so that the curling radius of the curtain sheet is smaller, the space requirement of the curtain sheet in a non-use state is effectively reduced, and the storage and the transportation are facilitated.

Referring to fig. 18, fig. 18 is a schematic structural diagram of a laser projection apparatus according to an embodiment of the present application. The laser projection device may include: projection screen 000 and projection host 001. Projection screen 000 can be the projection screen shown in fig. 5, 9, 10, 11, 12, 13, 14, 15, or 16. Fig. 18 illustrates an example in which the laser projection device includes the projection screen 000 shown in fig. 13.

In the embodiment of the present application, please refer to fig. 19, fig. 19 is a schematic structural diagram of another projection apparatus provided in the embodiment of the present application. The projection device may further include: a housing section 002, the housing section 002 being configured to house the projection host 001 and the projection screen 000. The housing portion 002 may have a light-transmitting region 0021 and an opening 0022, and the light beam emitted from the projection host 001 can pass through the light-transmitting region 0021, and the elevating mechanism 800 can control the curtain sheet 100 to pass through the opening 0022 and spread. In this way, when the projection apparatus is not used, the projection host 001 and the projection screen 000 are housed in the housing section 002, so that space can be saved. When the projection apparatus is in use, the lifting mechanism 800 controls the curtain sheet 100 to be unfolded, and the projection host 001 projects a light beam onto the curtain sheet 100, so that the curtain sheet 100 displays a projection screen.

The vertical distance from the center point of the light-transmitting region 0021 to the plane of the unfolded curtain sheet 100 is equal to the product of the projection ratio of the projection host and the width of the display area on the curtain sheet, wherein the width of the display area refers to the dimension of the display area along the horizontal direction. In this way, the light beam emitted from the projection host 001 can be ensured to be accurately projected to the display area of the screen 100, so as to ensure the definition of the projection picture on the screen 100.

Since the projection ratio is a performance parameter of the projection host 001 itself, the projection ratio of the projection host 001 is related to the selected projection host 001, that is, different projection hosts 001 are selected, and the vertical distance from the center point of the light-transmitting region 0021 to the plane of the unfolded curtain sheet 100 is also different. In this way, in the actual setting process, the vertical distance from the center point of the light transmission area 0021 to the plane where the unfolded curtain sheet 100 is located is calculated by the projection ratio of the projection host 001 and the width of the display area, so that the light beam emitted by the projection host 001 can be ensured to be completely projected in the display area of the curtain sheet 100.

Alternatively, the projection host 001 may be an ultrashort-focus projection host, which may be a DLP (Digital Light Procession, digital light processing) projection host. In this way, the distance between the projection host 001 and the plane of the projection screen 000 is set to be a short distance, so that the miniaturization design of the entire projection apparatus is realized. Projection host 001 may include: light source, light engine and lens (not shown). The light source is used for emitting light beams to the optical machine.

The optical engine may include: a digital micromirror array (Digital Micromirror Device, DMD) and a driver circuit board electrically connected to the DMD, the driver circuit board in the optomachine for providing driving signals to the DMD. Therefore, the DMD can modulate the light beam emitted from the light source based on the driving signal, and emit the modulated light beam to the lens, and then emit the light beam to the screen in the projection screen 000 through the lens, so that the screen 100 can display a projection picture. The projection host 001 includes a lens that is an ultra-short focal projection lens, for example.

The sheet 100 in the projection screen 000 may be an optical sheet, such as a rollable fresnel optical screen, or may be a flexible black-grid sheet, which has a higher optical gain than a conventional sheet, and can restore brightness and contrast of a light beam as much as possible, and by controlling and stretching the lifting mechanism 800, a higher flatness is achieved, which can be applied to an ultra-short focal 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" refers to two or more, unless explicitly defined otherwise.

The foregoing description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, since it is intended that all modifications, equivalents, improvements, etc. that fall within the spirit and scope of the invention.

Claims

1. A projection screen, comprising: the curtain sheet, the accommodating part and the supporting piece;

the curtain sheet is used for displaying projection pictures;

wherein the support piece is movable in the cavity of the accommodating part.

2. The projection screen of claim 1 wherein the receptacle comprises: an adhesive portion and a connecting portion;

the number of the bonding parts is multiple, the bonding parts are bonded with the back surface of the curtain sheet, and the bonding parts are distributed along the curling direction of the curtain sheet;

the connecting parts are bonded with one sides, far away from the curtain sheets, of the bonding parts, and two adjacent bonding parts and the connecting parts form a cavity.

3. The projection screen of claim 2, wherein the projection screen further comprises: the protective film layer is positioned on the back surface of the curtain sheet and is connected with the back surface of the curtain sheet;

wherein, the protection film layer, the connecting part and two adjacent bonding parts form a cavity.

4. The projection screen of claim 2, wherein the connection portion is a structure made of a hard material when the thickness of the support member is equal to the thickness of the bonding portion.

5. The projection screen of claim 2 wherein the attachment portion is a structure made of a soft material when the thickness of the support member is greater than the thickness of the adhesive portion.

6. The projection screen of claim 2, wherein the connecting portion has a plurality of slits, and the plurality of slits are in one-to-one correspondence with a plurality of the bonding portions, and an orthographic projection of each slit on the screen sheet is located within an orthographic projection of the bonding portion on the screen sheet.

7. The projection screen of claim 2 wherein the side of the adhesive portion has an adhesion-inhibiting layer that is at least partially in contact with the support.

8. The projection screen of claim 1 wherein the receptacle comprises: the convex parts are arranged along the curling direction of the curtain sheet, and each convex part is provided with at least one cavity.

9. The projection screen of claim 8, wherein the projection screen further comprises: the protective film layer is positioned on the back surface of the curtain sheet and connected with the back surface of the curtain sheet, and one side, far away from the curtain sheet, of the protective film layer is connected with the plurality of protruding parts;

each protruding portion faces one side of the protective film layer, at least one strip-shaped groove is formed in the side, facing the protective film layer, of each protruding portion, and the strip-shaped grooves between the protective film layer and the protruding portions are cavities.

10. The projection screen of any one of claims 1 to 9, wherein the projection screen further comprises: the two sealing strips are connected with the back of the curtain sheet, the length direction of the sealing strips is perpendicular to the length of the cavity, the containing parts are arranged between the two sealing strips, and the sealing strips are used for sealing off the end openings of the cavity.

11. The projection screen of claim 10 wherein the length of each of the cavities is perpendicular to the direction of curl of the curtain and the distance between each two adjacent cavities is equal.

12. The projection screen of claim 11, wherein the support is a strip-shaped carbon fiber sheet having a thickness ranging from 0.1 mm to 4 mm and a width ranging from 0.5 mm to 10 mm, and a distance between any two adjacent carbon fiber sheets ranging from 5 mm to 50 mm.

13. The projection screen of any one of claims 1 to 9, wherein the projection screen further comprises: a base, a lifting mechanism and a curling mechanism;

the lifting mechanism is fixed on the base, the lifting mechanism is fixedly connected with the first side edge of the curtain sheet, and the lifting mechanism is configured to: controlling the curtain sheet to be unfolded;

the crimping mechanism is fixed on the base, the crimping mechanism is fixedly connected with the second side of the curtain sheet, and the crimping mechanism is configured to: controlling the curtain sheet to be retracted;

wherein the second side is opposite to the first side.