CN212255999U

CN212255999U - Projection screen

Info

Publication number: CN212255999U
Application number: CN202020876290.7U
Authority: CN
Inventors: 李士杰; 苏晓磊; 王霖
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2020-12-29
Anticipated expiration: 2030-05-22
Also published as: WO2021233444A1

Abstract

An embodiment of the utility model provides a projection screen, including first curtain, second curtain and adhesive tape. The first curtain cloth comprises a first sound-transmitting area and a first bonding area which are connected, the first sound-transmitting area is provided with a plurality of first through holes, and the first bonding area is provided with a plurality of first blind holes; the second curtain comprises a second sound-transmitting area and a second bonding area which are connected, the second sound-transmitting area is provided with a plurality of second through holes, the second bonding area is provided with a plurality of second blind holes, and the second bonding area is adjacent to the first bonding area; the adhesive tape is attached to the second bonding area and the first bonding area to connect the first curtain and the second curtain. The utility model provides a projection screen sets up a plurality of second blind holes through set up a plurality of first blind holes, second bonding district in first bonding district, has realized projection screen luminance's unanimity, promotes projection screen's display effect.

Description

Projection screen

Technical Field

The utility model relates to the field of optical technology, particularly, relate to a projection screen.

Background

In a cinema setting, in order to obtain a surround sound effect, a plurality of sound boxes are usually placed behind a projection screen, so that audiences can hear sounds in different directions when watching a picture, and the cinema setting has an experience of being personally on the scene. The traditional film screen needs to be provided with sound transmission holes to obtain better sound transmission effect. Since the sizes of the film screens are relatively large (for example, more than 50 square meters), and it is very difficult to process sound-transmitting holes on the film screens with the full size, it is usually selected to punch holes on a sheet or a narrow and wide roll, and then splice the sheet with the sound-transmitting holes into the full screen.

The existing film screens on the market usually use a screen splicing tape after the splicing gap and are bonded by UV glue/thermosetting glue or the like. Therefore, the brightness of the spliced part is higher than that of the surrounding part, the periodical bright marks of the screen can be seen in the film watching process, and the display effect of the screen needs to be improved.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide a projection screen to solve above-mentioned problem. The embodiment of the utility model provides an above-mentioned purpose is realized through following technical scheme.

An embodiment of the utility model provides a projection screen, including first curtain, second curtain and adhesive tape. The first curtain cloth comprises a first sound-transmitting area and a first bonding area which are connected, the first sound-transmitting area is provided with a plurality of first through holes, and the first bonding area is provided with a plurality of first blind holes; the second curtain comprises a second sound-transmitting area and a second bonding area which are connected, the second sound-transmitting area is provided with a plurality of second through holes, the second bonding area is provided with a plurality of second blind holes, and the second bonding area is adjacent to the first bonding area; the adhesive tape is attached to the second bonding area and the first bonding area to connect the first curtain and the second curtain.

In one embodiment, the first bonded region has an open area percentage of 95% to 105% of the open area percentage of the first sound-transmitting region and the second bonded region has an open area percentage of 95% to 105% of the open area percentage of the second sound-transmitting region.

In one embodiment, the first bonded region, the first acoustically transparent region, the second bonded region, and the second acoustically transparent region each have an open area percentage of 0.1% to 10%.

In one embodiment, the first bonded region, the first acoustically transparent region, the second bonded region, and the second acoustically transparent region have the same open area ratio.

In one embodiment, the first blind hole has a diameter equal to the diameter of the second blind hole, the first through hole has a diameter equal to the diameter of the second through hole, and the first blind hole has a diameter smaller than the diameter of the first through hole.

In one embodiment, the distance between two adjacent first blind holes is equal to the distance between two adjacent second blind holes, the distance between two adjacent first through holes is equal to the distance between two adjacent second through holes, the distance between two adjacent first blind holes is smaller than the distance between two adjacent first through holes, and the depth of each first blind hole is equal to the depth of each second blind hole.

In one embodiment, the first curtain includes first and second opposing outer surfaces and a first inner surface, the second curtain includes second and second opposing inner surfaces, the adhesive tape is adhered to the first and second inner surfaces, the plurality of first blind holes are exposed at the first outer surface, the plurality of second blind holes are exposed at the second outer surface, the first and second outer surfaces are coplanar, and the first and second inner surfaces are coplanar.

In one embodiment, the first screen includes a first metal layer and a first substrate layer stacked, the first blind hole includes a metal perforated section and a substrate blind hole section, the metal perforated section penetrates through the first metal layer, the substrate blind hole section does not penetrate through the first substrate layer, an aperture value of the metal perforated section is a constant value, an aperture value of the substrate blind hole section is a variable value, and an aperture value of the metal perforated section is smaller than a maximum aperture value of the substrate blind hole section.

In one embodiment, a seam exists between the first curtain and the second curtain, the first bonding area comprises a first bending area and a first flat area, the second bonding area comprises a second bending area and a second flat area, the first bending area and the second bending area are respectively located on two sides of the seam and protrude towards a direction far away from the bonding adhesive tape, the aperture ratio of the first bending area is smaller than that of the first flat area, and the aperture ratio of the second bending area is smaller than that of the second flat area.

In one embodiment, the area of the first sound-transmissive region is greater than the area of the first bonding region, the area of the second sound-transmissive region is greater than the area of the second bonding region, and the area of the first bonding region is equal to the area of the second bonding region; the plurality of first blind holes are regularly arranged in the first bonding area, and the plurality of second blind holes are regularly arranged in the second bonding area; the first through holes are regularly arranged in the first sound-transmitting area, and the second through holes are regularly arranged in the second sound-transmitting area

Compared with the prior art, the utility model provides a projection screen sets up a plurality of second blind holes through set up a plurality of first blind holes, second bonding district in first bonding district, has realized the unanimity of projection screen luminance, promotes projection screen's display effect.

These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.

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 schematic diagram of a splicing of a projection screen provided by an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a projection screen provided in an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of a projection screen provided by an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a projection screen according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a projection screen according to another embodiment of the present invention.

Fig. 6 is a graph showing the correspondence between the hole diameter and the number of holes when the first blind hole ratio is 4% according to an embodiment of the present invention.

Fig. 7 is a schematic diagram of a hole forming manner of the first through hole according to an embodiment of the present invention.

Fig. 8 is a schematic view of another hole forming manner of the first through hole according to an embodiment of the present invention.

Detailed Description

In order to facilitate understanding of the embodiments of the present invention, the embodiments of the present invention will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The inventor of the application finds that in order to achieve sound transmission of the traditional film screen, a porous fiber material is selected, and a good sound transmission effect can be obtained without additional perforation; or the sound-transmitting holes are firstly made on the sheet material by using PVC and other materials with better thermal plasticity, and then the complete screen is manufactured by a thermal welding mode. These screen materials can achieve a good sound transmission effect, but when the screen materials are matched with a polarization type 3D projector, a metal reflection layer needs to be plated on the screen materials, and the polarization maintaining effect is not ideal.

To solve this problem, some materials with higher elastic modulus are used for making movie screens, for example

The microstructure with the size change far larger than the light wavelength is manufactured on the surface of the microstructure made of PET or PC and the like, and then the metal film is plated along with the microstructure, so that the effect of keeping the light deflection is good, and the screen brightness is improved. However, this technique is very dense in material, and even if the material is thin, it has high transmittance to high-frequency soundAnd also, it is not good, and thus it is necessary to process sound-transmitting holes on the screen. As shown in fig. 1, since the sizes of the film screens are relatively large (for example, more than 50 square meters), it is difficult to process sound-transmitting holes on the film screens with full size, so that holes are usually punched on a sheet or a narrow and wide roll, and then the sheet with the sound-transmitting holes is spliced into the full screen.

The embodiments and various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to fig. 2 and 3, an embodiment of the invention provides a projection screen 1, which includes a first curtain 10, a second curtain 20, and an adhesive tape 30. The first screen cloth 10 comprises a first sound-transmitting area 11 and a first bonding area 12 which are connected, wherein the first sound-transmitting area 11 is provided with a plurality of first through holes 111, and the first bonding area 12 is provided with a plurality of first blind holes 121; the second curtain 20 comprises a second sound-transmitting area 21 and a second bonding area 22 which are connected, the second sound-transmitting area 21 is provided with a plurality of second through holes 211, the second bonding area 22 is provided with a plurality of second blind holes 221, and the second bonding area 22 is adjacent to the first bonding area 12; the adhesive tape 30 is adhered to the second adhesive bonding region 22 and the first adhesive bonding region 12 to join the first curtain 10 and the second curtain 20.

Specifically, the projection screen 1 in this embodiment may be a screen of a movie theater, and may be formed by processing the first curtain 10 and the second curtain 20, and then splicing the first curtain 10 and the second curtain 20, where the splicing manner may be bonding by the adhesive tape 30 in this embodiment. In other embodiments, the projection screen 1 may further include a third curtain, a fourth curtain, or more curtains, and the plurality of curtains may be bonded by the adhesive tape 30. A patchwork 40 exists between the first screen 10 and the second screen 20.

With continued reference to fig. 3, the first curtain 10 includes first and second opposing

outer surfaces

13, 14 and the second curtain 20 includes second and second opposing

inner surfaces

23, 24. Wherein the first outer surface 13 and the second outer surface 23 are both display surfaces of the projection screen 1. The plurality of first blind holes 121 open from 13 to 14, i.e., the plurality of first blind holes 121 are exposed to the first outer surface 13. The plurality 221 is opened from 23 to 24, i.e., the plurality 24 is exposed to the second outer surface 23. In the present embodiment, the first outer surface 13 and the second outer surface 23 are coplanar, and the first inner surface 14 and the second inner surface 24 are coplanar, that is, the first curtain 10 and the second curtain 20 have the same thickness and are flush with each other, so that the phenomena of picture deformation and the like caused by the unevenness of the display surface can be eliminated.

The adhesive tape 30 is adhered to the first inner surface 14 and the second inner surface 24 to connect the first screen 10 and the second screen 20. In the present embodiment, the adhesive tape 30 may be a general scotch tape. In other embodiments, the first curtain 10 and the second curtain 20 may be connected by UV glue, thermosetting glue, or the like.

The projection screen 1 of the present embodiment is configured to improve the transmittance of high frequency sound by making round holes uniformly arranged in the first curtain 10 and the second curtain 20 by using laser, and the transmittance of high frequency sound is related to the aperture ratio. The open cell content is defined as:

in the above equation, η represents the opening ratio, B represents the number of holes, r represents the aperture diameter, and D represents the area of the open pore region.

In the present embodiment, the area of the first sound-transmitting region 11 is greater than the area of the first bonding region 12, the area of the second sound-transmitting region 21 is greater than the area of the second bonding region 22, and the area of the first bonding region 12 is equal to the area of the second bonding region 22. The adhesive tape 30 is adhered between the first curtain 10 and the second curtain 20 and covers the patchwork 40.

The open area ratio of the first bonding region 12 is defined as a first blind area ratio, and the open area ratio of the second bonding region 22 is defined as a second blind area ratio. Wherein the first blind hole rate satisfies:

the second blind hole rate satisfies:

wherein B1 represents the number of first blind holes 121, r₁Is the radius of the first blind hole 121, D_b1Is the area of the first bonding area 12; b2 is the number of second blind holes 221, r₂Is the radius of the second blind hole 221, D_b2Is the area of the second bonding region 22. Specifically, r₁May refer to the average radius at which the plurality of first blind holes 121 are exposed at the first outer surface 13; r is₂May refer to the average radius at which the plurality of second blind holes 221 are exposed at the second outer surface 23.

In this embodiment, the first blind via rate may be substantially equal to the second blind via rate, for example, the first blind via rate may be 95% -105% of the second blind via rate. This makes the first bonding area 12 and the second bonding area 22 have the same brightness, thereby improving the display effect of the projection screen 1. Specifically, in the present embodiment, the first blind via rate and the second blind via rate may be both between 0.1% and 10%.

In this embodiment, the plurality of first blind holes 121 may be regularly arranged at the first bonding region 12, and the plurality of second blind holes 221 may be regularly arranged at the second bonding region 22. The distance between two adjacent first blind holes 121 is equal to the distance between two adjacent second blind holes 221. As an example, the distance between two adjacent first blind holes 121 is 0.22 mm. In one embodiment, the plurality of first blind holes 121 may be disposed in a rectangular array on the first bonding area 12, and the plurality of second blind holes 221 may also be disposed in a rectangular array on the second bonding area 22. In other embodiments, the plurality of first blind holes 121 and the plurality of second blind holes 221 may be regularly arranged in other manners.

Referring to fig. 2, fig. 4 and fig. 5, in other embodiments, the plurality of first blind holes 121 of the first bonding area 12 may also be arranged unevenly, i.e. the density of the plurality of first blind holes 121 is not evenly distributed. Specifically, since the projection screen 1 is formed by splicing, in some splicing situations, the screens of the first bonding region 12 and the second bonding region 22 (splicing positions) may be subjected to bending deformation, and the first bonding region 12 and the second bonding region 22 are at least partially protruded in a direction away from the adhesive tape 30. For example, the main direction of the projected reflected light is changed due to bending deformation caused by mutual pressing between the two curtains, and the viewer who looks like the front view may feel that the brightness of the projection screen 1 is lowered. Therefore, the hole density is appropriately reduced, or the hole diameter is reduced, so that the duty cycle of the first blind hole 121 or the second blind hole 221 is reduced.

Specifically, as shown in fig. 4, in other embodiments, the first bonding region 12 includes a first bending region 123 and a first flat region 125, the second bonding region 22 includes a second bending region 223 and a second flat region 225, and the first bending region 123 and the second bending region 223 are respectively located at both sides of the patchwork 40 and both protrude in a direction away from the adhesive tape 30. At this time, the viewer who looks like the front view may feel that the brightness of the first bending region 123 and the second bending region 223 intersects at other regions lower, and thus, the aperture ratio of the first bending region 123 may be set to be smaller than that of the first leveling region 125, and the aperture ratio of the second bending region 223 may be set to be smaller than that of the second leveling region 225. The first bending region 123 and the second bending region 223 may be regular regions or irregular regions.

As shown in fig. 5, when the whole first bonding area 12 and the whole second bonding area 22 are bent and the bending curvatures at the positions are equal, the included angle between the emergent ray of the first bonding area 12 and the viewing direction of the viewer is defined as θ, and the first blind hole ratio η' needs to satisfy:

where η is the magnitude of the first blind hole ratio when the viewing angle of the user is parallel to the emergent ray, and it can be understood that θ is an acute angle. It can be seen from the above formula that the larger the angle, the larger the first blind via rate. That is, the opening ratio of the first curtain 10 gradually increases in a direction away from the patchwork 40. It will be appreciated that the open area of the second curtain 20 also gradually increases in a direction away from the patchwork 40.

In this embodiment, the aperture of the first blind hole 121 may be equal to the aperture of the second blind hole 221, and the aperture of the first blind hole 121 may beAbout 0.025 mm. As an example, the first blind hole rate is 4%, and the size of the first bonding region 12 is 1m². According to the above formula, when the aperture of the first blind hole 121 is 0.1mm, the number of the first blind holes 121 is about 127 ten thousand. When the diameter of the first blind hole 121 is 0.025mm, the number of the first blind holes 121 is about 2000 ten thousand. That is, the number of holes is inversely proportional to the size of the corresponding hole diameter, as shown in fig. 6. In the present embodiment, the depth of the first blind hole 121 may be equal to the depth of the second blind hole 221. The holes can be drilled by laser, and as an example, a carbon dioxide laser can be used, which is operated in a radio frequency mode (above 100 Hz), has a laser power above 10W, and has an action time set according to practical conditions, generally between 1 microsecond and 100 microseconds. By accurately controlling the spot of the laser beam, the laser can be incident from the display surface of the projection screen 1, removing only the surface layer material, without penetrating the entire screen. This arrangement prevents glue (from the adhesive tape 30) from the first bonding area 12 and the second bonding area 22 from penetrating the display surface, and does not affect the display of the projection screen 1.

The open porosity of the first sound-transmitting zone 11 is defined as the first through porosity and the open porosity of the second sound-transmitting zone 21 is defined as the second through porosity. Wherein the first through-hole rate satisfies:

the second porosity satisfies:

wherein T1 is the number of first vias 111, R₁Is the radius of the first through-hole 111, D_t1Is the area of the first sound-transmitting zone 11; t2 is the number of second through holes 211, R₂Is the radius of the second through hole 211, D_t2Is the area of the second sound-transmitting zone 21. In particular, R₁May refer to an average radius of the plurality of first through holes 111 exposed at the first outer surface 13; r₂Can meanIs the average radius at which the plurality of second through holes 211 are exposed at the second outer surface 23.

In this embodiment, the first bonding region 12 has an aperture ratio of 95% to 105% of the aperture ratio of the first sound-transmitting region 11, and the second bonding region 22 has an aperture ratio of 95% to 105% of the aperture ratio of the second sound-transmitting region 21. That is, the first through hole rate, the first blind hole rate, the second through hole rate and the second blind hole rate have substantially the same value, and the difference is small. Therefore, the brightness of the first bonding area 12, the second bonding area 22, the first sound-transmitting area 11 and the second sound-transmitting area 21 is basically consistent, and the human eyes cannot perceive an obvious brightness difference, that is, the brightness of each part of the projection screen 1 is consistent, thereby improving the viewing experience of the user. Specifically, in the present embodiment, the first bonding area 12, the first sound-transmitting area 11, the second bonding area 22 and the second sound-transmitting area 21 each have an aperture ratio of 0.1% to 10%. As an example, the specific open cell content may be 0.3% to 5%. In actual production, the appropriate opening rate can be selected according to requirements. In one embodiment, the first bonding area 12, first sound-transmissive area 11, second bonding area 22, and second sound-transmissive area 21 may have the same open porosity.

In the present embodiment, the aperture of the first through hole 111 is equal to the aperture of the second through hole 211, and the aperture of the first through hole 111 is larger than the aperture of the first blind hole 121. Wherein "pore size" refers to the diameter of the pores exposed at the first outer surface 13 and the second outer surface 23. In this embodiment, the aperture of the first through hole 111 may be about 0.1mm, which is about 4 times the aperture of the first blind hole 121. According to the above formula, at a first through-hole ratio of 4%, the size of the first sound-transmitting region 11 is 1m²The number of the first through holes 111 is about 127 ten thousand, which is about 1/16 of the number of the first blind holes 121. The first through hole 111 may be opened by laser, and a carbon dioxide laser, a solid laser, or the like may be used.

In this embodiment, the plurality of first through holes 111 may be regularly arranged in the first sound-transmitting region 11, and the plurality of second through holes 211 may be regularly arranged in the second sound-transmitting region 21. The interval between two adjacent first through holes 111 may be equal to the interval between two adjacent second through holes 211. In one embodiment, the first through holes 111 may be disposed in the first sound-transmitting region 11 in a rectangular array, and the second through holes 211 may also be disposed in the second sound-transmitting region 21 in a rectangular array. The distance between two adjacent first through holes 111 is greater than the distance between two adjacent first blind holes 121. As an example, the distance between two adjacent first through holes 111 is 0.89mm, which is approximately four times the distance between two adjacent first blind holes 121. In other embodiments, the plurality of first through holes 111 and the plurality of second through holes 211 may be regularly arranged in other manners.

Referring to fig. 7 and 8, when viewed from the thickness direction of the projection screen 1, the first sheet 10 includes a first metal layer 15 and a first substrate layer 16, the first metal layer 15 has a first outer surface 13, and the first substrate layer 16 has a first inner surface 14. In this embodiment, the first substrate layer 16 is made of PET (Polyethylene terephthalate), the elastic modulus of the PET material is high, the first metal layer 15 can be plated on the first substrate layer 16 in a film plating manner, and the first metal layer 15 is disposed on the first substrate layer 16, so that the effect of maintaining the light deflection of the projection screen 1 is good, and the improvement of the brightness of the projection screen 1 is facilitated.

Since the thermal conductivities of the metal and the nonmetal are different, the cross-sectional shape of the hole is different between the case where the laser beam enters from the first outer surface 13 (first metal layer 15) and the case where the laser beam enters from the first inner surface 14 (first base layer 16) during the laser drilling. Due to the difference in thermal conductivity, the first substrate layer 16 is larger than the area of the laser spot and also melts due to the temperature exceeding the glass transition temperature Tg, so the open hole will be larger than the area of the spot. Specifically, in the present embodiment, the first blind via 121 and the first through hole 111 may be formed by laser processing, the first blind via 121 includes a metal through hole section 1211 and a base blind via section 1212, the first through hole 111 has a metal through hole section 1113 and a base through hole section 1115, the metal through hole section 1211 and the metal through hole section 1113 both penetrate through the first metal layer 15, the base blind via section 1212 does not penetrate through the first base layer 16, and the base through hole section 1115 penetrates through the first base layer 16. The aperture value of the metal perforated section 1211 is a fixed value, the aperture value of the substrate blind hole section 1212 is a variable value, and the aperture value of the metal perforated section 1211 is smaller than the maximum aperture value of the substrate blind hole section 1212; the aperture value of the metal via segment 1113 is constant, the aperture value of the substrate via segment 1115 is variable, and the aperture value of the substrate via segment 1115 gradually increases along the direction away from the metal via segment 1113. In other embodiments, the first via may also be formed by mechanical drilling, and the aperture value of the base via segment 1115 may also be constant and equal in size to the aperture value of the metal via segment 1113.

It can be understood by those skilled in the art that the aperture value of the second blind via 221 varies in accordance with the aperture value of the first blind via 121, and the aperture value of the second through via 211 varies in accordance with the aperture value of the first through via 111, and therefore, it will not be described herein.

In one embodiment, r is used in calculating the open cell content₁It may be referred to as the average radius to which the plurality of first blind holes 121 are exposed 13. Of course, those skilled in the art will appreciate that in other embodiments, r is the same as₁Other statistical methods may also be present, such as randomly picking 1cm on the first bonding region 12²Area, the average radius of all first blind holes 121 in the area is taken as r₁Or the first bonding area 12 is divided into a plurality of areas, one first blind hole 121 is randomly selected in each area, and then the average radius of the plurality of first blind holes 121 is taken as r₁。

It will be understood by those skilled in the art that in other embodiments, the plurality of first blind holes 121 may be arranged in other manners, such as being arranged in a linear array in a direction parallel to the seam 40 at the first bonding area 12, and the smaller the distance between two adjacent first blind holes 121 in a direction away from the seam 40.

When the projection curtain 1 of the technical scheme is manufactured, the projection curtain can be manufactured through the following steps:

1. processing the first curtain 10 and the second curtain 20 after surface structure processing, film coating and hole forming processes are carried out, wherein the hole forming process of the first curtain 10 comprises the steps of forming a plurality of first blind holes 121 in the first bonding area 12 and forming a plurality of first through holes 111 in the first sound transmission area 11; the second curtain 20 is perforated by a plurality of second blind holes 221 formed in the second bonding area 22 and a plurality of second through holes 211 formed in the second sound-transmitting area 21.

2. The first bonding area 12 of the first curtain 10 and the second bonding area 22 of the second curtain 20 are aligned with each other, and the adhesive tape 30 is adhered to the first inner surface 14 corresponding to the first bonding area 12 and the second inner surface 24 corresponding to the second bonding area 22, so as to fixedly connect the first curtain 10 and the second curtain 20, thereby completing the production of the projection curtain 1.

To sum up, the utility model provides a projection screen 1 sets up a plurality of second blind holes 221 through set up a plurality of first blind holes 121, second bonding area 22 at first bonding area 12, has realized the unanimity of projection screen 1 luminance, promotes projection screen 1's display effect.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A projection screen, comprising:

the first curtain cloth comprises a first sound-transmitting area and a first bonding area which are connected, wherein the first sound-transmitting area is provided with a plurality of first through holes, and the first bonding area is provided with a plurality of first blind holes;

the second curtain comprises a second sound-transmitting area and a second bonding area which are connected, wherein the second sound-transmitting area is provided with a plurality of second through holes, the second bonding area is provided with a plurality of second blind holes, and the second bonding area is adjacent to the first bonding area; and

and the adhesive tape is attached to the second bonding area and the first bonding area so as to connect the first curtain and the second curtain.

2. The projection screen of claim 1 wherein the first bonded region has an open area ratio of 95% to 105% of the open area ratio of the first sound-transmissive region and the second bonded region has an open area ratio of 95% to 105% of the open area ratio of the second sound-transmissive region.

3. The projection screen of claim 1 wherein the first bonded region, the first acoustically transparent region, the second bonded region, and the second acoustically transparent region each have an open area ratio of 0.1% to 10%.

4. The projection screen of claim 1 wherein the first bonded region, the first sound-transmissive region, the second bonded region and the second sound-transmissive region have the same open area ratio.

5. The projection screen of claim 1, wherein the first blind hole has an aperture equal to the aperture of the second blind hole, the first through hole has an aperture equal to the aperture of the second through hole, and the first blind hole has an aperture smaller than the aperture of the first through hole.

6. The projection screen of claim 1, wherein the distance between two adjacent first blind holes is equal to the distance between two adjacent second blind holes, the distance between two adjacent first through holes is equal to the distance between two adjacent second through holes, the distance between two adjacent first blind holes is smaller than the distance between two adjacent first through holes, and the depth of each first blind hole is equal to the depth of each second blind hole.

7. The projection screen of claim 1, wherein the first curtain comprises first and second opposing outer surfaces and a first inner surface, the second curtain comprises second and second opposing inner surfaces, the adhesive tape is adhered to the first and second inner surfaces, the plurality of blind holes are exposed at the first outer surface, the plurality of blind holes are exposed at the second outer surface, the first and second outer surfaces are coplanar, and the first and second inner surfaces are coplanar.

8. The projection screen of claim 1 wherein the first veil comprises a first metal layer and a first substrate layer in a stack, the first blind holes comprising a metal perforated section and a substrate blind hole section, the metal perforated section penetrating the first metal layer, the substrate blind hole section not penetrating the first substrate layer, the metal perforated section having a constant aperture value, the substrate blind hole section having a varying aperture value, and the metal perforated section having an aperture value less than a maximum aperture value of the substrate blind hole section.

9. The projection screen of claim 1, wherein a splice exists between the first and second sheets, wherein the first bonding region comprises a first bending region and a first leveling region, wherein the second bonding region comprises a second bending region and a second leveling region, wherein the first bending region and the second bending region are located on either side of the splice and both protrude in a direction away from the bonding tape, wherein the first bending region has an open area ratio that is less than the open area ratio of the first leveling region, and wherein the second bending region has an open area ratio that is less than the open area ratio of the second leveling region.

10. The projection screen of claim 1 wherein the area of the first sound-transmissive region is greater than the area of the first bonding region, the area of the second sound-transmissive region is greater than the area of the second bonding region, the area of the first bonding region is equal to the area of the second bonding region; the plurality of first blind holes are regularly arranged in the first bonding area, and the plurality of second blind holes are regularly arranged in the second bonding area; the first through holes are regularly arranged in the first sound-transmitting area, and the second through holes are regularly arranged in the second sound-transmitting area.