WO2021233444A1 - Écran de projection - Google Patents

Écran de projection Download PDF

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Publication number
WO2021233444A1
WO2021233444A1 PCT/CN2021/095321 CN2021095321W WO2021233444A1 WO 2021233444 A1 WO2021233444 A1 WO 2021233444A1 CN 2021095321 W CN2021095321 W CN 2021095321W WO 2021233444 A1 WO2021233444 A1 WO 2021233444A1
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WO
WIPO (PCT)
Prior art keywords
area
sound
holes
bonding
bonding area
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Application number
PCT/CN2021/095321
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English (en)
Chinese (zh)
Inventor
李士杰
苏晓磊
王霖
Original Assignee
深圳光峰科技股份有限公司
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Publication of WO2021233444A1 publication Critical patent/WO2021233444A1/fr

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens

Definitions

  • the utility model relates to the field of optical technology, in particular to a projection screen.
  • the purpose of the embodiments of the present invention is to provide a projection screen to solve the above-mentioned problems.
  • the embodiments of the present invention achieve the above-mentioned objects through the following technical solutions.
  • the embodiment of the utility model provides a projection screen, which includes a first curtain, a second curtain and adhesive tape.
  • the first curtain includes a connected first sound-transmitting area and a first bonding area, 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 includes a corresponding The second sound-permeable area is connected to the second bonding area, the second sound-permeable 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 bonded to the first The areas are adjacent; the adhesive tape is attached to the second adhesive area and the first adhesive area to connect the first curtain and the second curtain.
  • the opening ratio of the first bonding area is 95%-105% of the opening ratio of the first sound-transmitting area
  • the opening ratio of the second bonding area is that of the second sound-transmitting area.
  • the porosity is 95%-105%.
  • the opening rates of the first bonding area, the first sound-transmitting area, the second bonding area, and the second sound-transmitting area are all 0.1%-10%.
  • the opening rates of the first bonding area, the first sound-transmitting area, the second bonding area, and the second sound-transmitting area are the same.
  • the aperture of the first blind hole is equal to the aperture of the second blind hole
  • the aperture of the first through hole is equal to the aperture of the second through hole
  • the aperture of the first blind hole is smaller than the aperture of the first through hole
  • the distance between two adjacent first blind holes is equal to the distance between two adjacent second blind holes, and the distance between two adjacent first through holes is equal to the distance between two adjacent first through holes.
  • the distance between the 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 the first blind hole is equal to the depth of the second blind hole.
  • the first curtain includes a first outer surface and a first inner surface opposite to each other
  • the second curtain includes a second outer surface and a second inner surface opposite to each other
  • the adhesive tape is attached to the first inner surface.
  • Surface and second inner surface a plurality of first blind holes are exposed on the first outer surface
  • a plurality of second blind holes are exposed on the second outer surface
  • the first outer surface and the second outer surface are coplanar
  • the first inner surface and The second inner surface is coplanar.
  • the first curtain includes a first metal layer and a first base layer that are stacked, the first blind hole includes a metal perforated section and a base blind hole section, the metal perforated section penetrates the first metal layer, and the base blind hole
  • the hole segment does not penetrate the first substrate layer, the aperture value of the metal perforation segment is a fixed value, the aperture value of the base blind hole segment is a variable value, and the aperture value of the metal perforation segment is smaller than the maximum aperture value of the base blind hole segment.
  • the first bonding zone includes a first bending zone and a first flattening zone
  • the second bonding zone includes a second bending zone and a first flat zone.
  • Two flattening zones, the first bending zone and the second bending zone are located on both sides of the seam, and both protrude away from the adhesive tape.
  • the opening rate of the first bending zone is less than that of the first flattening zone.
  • the opening rate, the opening rate of the second bending zone is smaller than the opening rate of the second flat zone.
  • the area of the first sound-transmitting zone is larger than the area of the first bonding zone
  • the area of the second sound-transmitting zone is larger than the area of the second bonding zone
  • the area of the first bonding zone is equal to the area of the second bonding zone.
  • the projection screen provided by the present invention realizes the consistent brightness of the projection screen by opening a plurality of first blind holes in the first bonding area and a plurality of second blind holes in the second bonding area. Improve the display effect of the projection screen.
  • Fig. 1 is a schematic view of the 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 by 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 provided by an implementation manner of an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a projection screen provided by another implementation of the embodiment of the present invention.
  • FIG. 6 is a diagram of the corresponding relationship between the hole diameter and the number of holes when the first blind hole rate is 4% according to the embodiment of the present invention.
  • FIG. 7 is a schematic diagram of an opening method of the first through hole provided by the embodiment of the present invention.
  • FIG. 8 is a schematic diagram of another opening method of the first through hole provided by the embodiment of the present invention.
  • the inventor of the present application found that in order to achieve sound transmission in traditional movie screens, some select porous fiber materials to obtain better sound transmission effects without additional perforation; or use PVC and other materials with better thermoplastic properties. First, make a sound hole, and then make a complete screen by heat welding. These screen materials can achieve better sound transmission effects, but when matched with a polarizing 3D projector, a metal reflective layer needs to be plated on the material, and the polarization maintaining effect is not very ideal.
  • some materials with higher elastic modulus are used to make movie screens, such as Selecting materials such as PET or PC, making microstructures on the surface of which the size changes far greater than the wavelength of the light, and then pattern-plating a metal film, so that the effect of maintaining the deflection of the light is good, and it is also beneficial to improve the brightness of the screen.
  • Selecting materials such as PET or PC
  • the material of this technology is very dense, even if the thickness is very thin, the transmittance of high-frequency sound is not good, so it is necessary to process the sound-permeable holes on the screen.
  • an embodiment of the present invention provides a projection screen 1, which includes a first curtain 10, a second curtain 20 and an adhesive tape 30.
  • the first curtain 10 includes a first sound-transmitting area 11 and a first bonding area 12 that are connected.
  • the first sound-transmitting area 11 is provided with a plurality of first through holes 111
  • the first bonding area 12 is provided with a plurality of first blind holes.
  • the second curtain 20 includes a connected second sound-transmitting area 21 and a second bonding area 22, the second sound-transmitting area 21 is provided with a plurality of second through holes 211, and the second bonding area 22 is provided with a plurality of second Blind hole 221, the second bonding area 22 is adjacent to the first bonding area 12; the adhesive tape 30 is attached to the second bonding area 22 and the first bonding area 12 to connect the first curtain 10 and the second Curtain 20.
  • the projection screen 1 in this embodiment can be a movie theater screen, which can be achieved by first processing the first curtain 10 and the second curtain 20, and then splicing the first curtain 10 and the second curtain 20 in a splicing manner. It may be bonded by the adhesive tape 30 in this embodiment. In other embodiments, the projection screen 1 may also include a third curtain, a fourth curtain, or more curtains, and multiple curtains may be bonded by an adhesive tape 30. There is a seam 40 between the first curtain 10 and the second curtain 20.
  • the first curtain 10 includes a first outer surface 13 and a first inner surface 14 opposite to each other
  • the second curtain 20 includes a second outer surface 23 and a second inner surface 24 opposite to each other.
  • 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 are opened in the direction from 13 to 14, that is, the plurality of first blind holes 121 are exposed on the first outer surface 13.
  • the plurality of 221 are opened from the 23 to the 24 direction, that is, the plurality of 24 are exposed on the second outer surface 23.
  • 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 thickness of the first curtain 10 and the second curtain 20 are the same. , And the two are flush, which can eliminate the picture distortion caused by the unevenness of the display surface.
  • the adhesive tape 30 is attached to the first inner surface 14 and the second inner surface 24 to connect the first curtain 10 and the second curtain 20.
  • the adhesive tape 30 may be a common transparent tape.
  • the first curtain 10 and the second curtain 20 can also be connected by UV glue or thermosetting glue.
  • the projection screen 1 of this embodiment uses lasers to make uniformly arranged circular holes on the first curtain 10 and the second curtain 20 to increase the transmittance of high-frequency sound, and the transmittance and aperture rate of high-frequency sound.
  • the opening rate is defined as:
  • ⁇ represents the open porosity
  • B represents the number of pores
  • r represents the pore diameter
  • D represents the area of the open area
  • the area of the first sound-transmitting zone 11 is larger than the area of the first bonding zone 12
  • the area of the second sound-transmitting zone 21 is larger than the area of the second bonding zone 22
  • the area of the first bonding zone 12 It is equal to the area of the second bonding zone 22.
  • the adhesive tape 30 is bonded between the first curtain 10 and the second curtain 20 and covers the seam 40.
  • the open porosity of the first bonding area 12 is defined as the first blind porosity
  • the open porosity of the second bonding area 22 is defined as the second blind porosity.
  • the first blind hole rate satisfies:
  • the second blind hole rate satisfies:
  • B1 is the number of first blind holes 121
  • r 1 is the radius of the first blind holes 121
  • D b1 is the area of the first bonding zone 12
  • B2 is the number of second blind holes 221
  • r 2 is the second The radius of the blind hole 221, D b2 is the area of the second bonding zone 22.
  • r 1 may refer to the average radius of the plurality of first blind holes 121 exposed on the first outer surface 13
  • r 2 may refer to the average radius of the plurality of second blind holes 221 exposed on the second outer surface 23 .
  • the first blind hole rate may be substantially equivalent to the second blind hole rate, for example, the first blind hole rate may be 95%-105% of the second blind hole rate.
  • both the first blind hole rate and the second blind hole rate may be between 0.1% and 10%.
  • the plurality of first blind holes 121 may be regularly arranged in the first bonding area 12, and the plurality of second blind holes 221 may be regularly arranged in the second bonding area 22.
  • the distance between two adjacent first blind holes 121 is equal to the distance between two adjacent second blind holes 221.
  • the distance between two adjacent first blind holes 121 is 0.22 mm.
  • the plurality of first blind holes 121 may be arranged in the first bonding area 12 in a rectangular array, and the plurality of second blind holes 221 may also be arranged in the second bonding area 22 in a rectangular array.
  • the plurality of first blind holes 121 and the plurality of second blind holes 221 may also be regularly arranged in other ways.
  • the plurality of first blind holes 121 of the first bonding area 12 may also be arranged unevenly, that is, the density of the plurality of first blind holes 121 is not uniform distributed.
  • the screens of the first bonding area 12 and the second bonding area 22 splicing position
  • the first bonding area 12 and The second bonding area 22 at least partially protrudes away from the bonding tape 30.
  • bending and deformation caused by squeezing between two curtains will cause the main direction of the reflected light to be changed.
  • viewers watching the movie from the front will feel that the brightness of the projection screen 1 becomes low. Therefore, the opening density is appropriately reduced, or the opening diameter is reduced, so as to reduce the duty ratio of the first blind hole 121 or the second blind hole 221.
  • the first bonding area 12 includes a first bending area 123 and a first flattening area 125
  • the second bonding area 22 includes a second bending area 223 and a first flattening area 125.
  • the two flattening areas 225, the first bending area 123 and the second bending area 223 are respectively located on both sides of the seam 40, and all protrude in a direction away from the adhesive tape 30.
  • the audience watching the movie from front will feel that the brightness of the first bending area 123 and the second bending area 223 is lower than that of other areas. Therefore, the aperture ratio of the first bending area 123 can be set to be smaller than that of the first bending area 123.
  • the opening ratio of the flattening area 125 and the opening ratio of the second bending area 223 are set to be smaller than the opening ratio of the second flattening area 225.
  • the first bending area 123 and the second bending area 223 may be regular areas or irregular areas.
  • ⁇ is the size of the first blind hole ratio when the user's viewing angle is parallel to the emitted light. It can be understood that ⁇ is an acute angle. It can be seen from the above formula that the greater the angle, the greater the first blind hole rate. In other words, along the direction away from the seam 40, the opening rate of the first curtain 10 gradually increases. It can be understood that in the direction away from the seam 40, the opening rate of the second curtain 20 also gradually increases.
  • 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 be about 0.025 mm.
  • the first blind hole rate is 4%
  • the size of the first bonding area 12 is 1 m 2 .
  • the number of the first blind hole 121 is about 1.27 million.
  • the number of the first blind hole 121 is about 20 million. In other words, the number of holes is inversely proportional to the size of the corresponding hole, as shown in Figure 6.
  • the depth of the first blind hole 121 may be equal to the depth of the second blind hole 221.
  • the hole can be opened by laser.
  • a carbon dioxide laser can be used, working in radio frequency mode (above 100Hz), and the laser power is above 10W.
  • the action time is set according to the actual situation, generally between 1 microsecond and 100 microseconds. between.
  • the opening ratio of the first sound-transmitting area 11 is defined as the first through-hole ratio
  • the opening ratio of the second sound-transmitting area 21 is defined as the second through-hole ratio.
  • the first through hole ratio satisfies:
  • the second through hole ratio satisfies:
  • T1 is the number of first through holes 111
  • R 1 is the radius of the first through holes 111
  • D t1 is the area of the first sound-transmitting area 11
  • T2 is the number of second through holes 211
  • R 2 is the second The radius of the through hole 211, D t2 is the area of the second sound-transmitting area 21.
  • R 1 may refer to the average radius of the plurality of first through holes 111 exposed on the first outer surface 13
  • R 2 may refer to the average radius of the plurality of second through holes 211 exposed on the second outer surface 23 .
  • the opening ratio of the first bonding area 12 is 95%-105% of the opening ratio of the first sound-transmitting area 11, and the opening ratio of the second bonding area 22 is It is 95%-105% of the opening rate of the second sound-transmitting zone 21.
  • the values of the first through hole rate, the first blind hole rate, the second through hole rate, and the second blind hole rate are basically equivalent, and the difference is small.
  • 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 are basically the same, and the human eye cannot perceive the obvious difference in brightness, that is, everywhere in the projection screen 1. The brightness is the same, which improves the user’s viewing experience.
  • the opening rates of the first bonding area 12, the first sound-transmitting area 11, the second bonding area 22, and the second sound-transmitting area 21 are all 0.1%-10%.
  • the specific open porosity may be 0.3%-5%.
  • the appropriate opening rate can be selected according to the needs.
  • the opening rates of the first bonding area 12, the first sound-transmitting area 11, the second bonding area 22, and the second sound-transmitting area 21 may be the same.
  • 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.
  • “aperture” refers to the diameter of the hole exposed on the first outer surface 13 and the second outer surface 23.
  • the diameter of the first through hole 111 may be about 0.1 mm, which is approximately 4 times the diameter of the first blind hole 121.
  • the number of first through holes 111 is about 1.27 million, which is roughly the first blind hole 121 1/16 of the number.
  • the first through hole 111 can be opened by a laser, and a carbon dioxide laser or a solid-state laser can be used.
  • the plurality of first through holes 111 may be regularly arranged in the first sound-transmitting area 11, and the plurality of second through holes 211 may be regularly arranged in the second sound-transmitting area 21.
  • the distance between two adjacent first through holes 111 may be equal to the distance between two adjacent second through holes 211.
  • the plurality of first through holes 111 may be arranged in a rectangular array in the first sound-transmitting area 11, and the plurality of second through holes 211 may also be arranged in a rectangular array in the second sound-transmitting area 21.
  • the distance between two adjacent first through holes 111 is greater than the distance between two adjacent first blind holes 121.
  • the distance between two adjacent first through holes 111 is 0.89 mm, which is roughly four times the distance between two adjacent first blind holes 121.
  • the plurality of first through holes 111 and the plurality of second through holes 211 may also be regularly arranged in other ways.
  • the first screen 10 includes a first metal layer 15 and a first base layer 16 that are stacked, and the first metal layer 15 has a first outer surface 13.
  • the first base layer 16 has a first inner surface 14.
  • the material of the first base layer 16 is PET (Polyethylene terephthalate, polyethylene terephthalate), and the elastic modulus of the PET material is relatively high.
  • the first metal layer 15 can be plated by coating. Covering the first base layer 16, by disposing the first metal layer 15 on the first base layer 16, the projection screen 1 has a good effect of maintaining light deflection, and it is also beneficial to improve the brightness of the projection screen 1.
  • the first blind hole 121 and the first through hole 111 may both be formed by laser processing.
  • the first blind hole 121 includes a metal perforated section 1211 and a base blind hole section 1212.
  • the first through hole 111 has The metal through hole section 1113 and the base through hole section 1115, the metal perforated section 1211 and the metal through hole section 1113 all penetrate the first metal layer 15, the base blind hole section 1212 does not penetrate the first base layer 16, the base through hole section 1115 Penetrate the first base layer 16.
  • the aperture value of the metal perforated section 1211 is a fixed value
  • the aperture value of the base blind hole section 1212 is a variable value
  • the aperture value of the metal perforated section 1211 is smaller than the maximum aperture value of the base blind hole section 1212
  • the aperture value of the metal through hole section 1113 is With a constant value
  • the aperture value of the substrate through hole section 1115 is a variable value
  • the aperture value of the substrate through hole section 1115 gradually increases along the direction away from the metal through hole section 1113.
  • the first through hole may also be formed by mechanical drilling
  • the aperture value of the base through hole section 1115 may also be a fixed value
  • the size is equal to the aperture value of the metal through hole section 1113.
  • the change of the aperture value of the second blind hole 221 is consistent with the change of the aperture value of the first blind hole 121
  • the change of the aperture value of the second through hole 211 is consistent with the change of the aperture value of the first through hole 111. No longer describe.
  • r 1 when calculating the aperture ratio, may refer to the average radius of the plurality of first blind holes 121 exposed to 13.
  • the r 1 may also have other statistical methods, such as randomly selecting a 1 cm 2 area on the first bonding area 12, and all the first blind areas in the area
  • the average radius of the hole 121 is taken as r 1 , or the first bonding area 12 is divided into multiple areas, a first blind hole 121 is randomly selected in each area, and then the average radius of the multiple first blind holes 121 is taken as r 1 .
  • the plurality of first blind holes 121 may also have other arrangements, for example, they are arranged in a linear array in the first bonding area 12 in a direction parallel to the seam 40, and are arranged along the In the direction away from the seam 40, the distance between two adjacent first blind holes 121 is smaller.
  • the hole-opening process of the first curtain 10 includes opening a plurality of first blind holes in the first bonding area 12 121. Open a plurality of first through holes 111 in the first sound-transmitting area 11; the hole-opening process of the second curtain 20 includes opening a plurality of second blind holes 221 in the second bonding area 22, and in the second sound-transmitting area 21 A plurality of second through holes 211 are opened.
  • Adhesive tape 30 is pasted on the second inner surface 24 corresponding to 22 to fix the first curtain 10 and the second curtain 20 to complete the production of the projection screen 1.
  • the projection screen 1 provided by the present invention realizes the projection screen 1 by opening a plurality of first blind holes 121 in the first bonding area 12 and a plurality of second blind holes 221 in the second bonding area 22.
  • the consistent brightness improves the display effect of the projection screen 1.

Abstract

L'invention concerne un écran de projection (1), comprenant un premier écran en tissu (10), un deuxième écran en tissu (20), et un ruban adhésif (30). Le premier écran en tissu (10) comprend une première zone transmettrice de son (11) et une première zone de soudage (12) qui sont reliées entre elles ; une pluralité de premiers trous traversants (111) sont réalisés dans la première zone transmettrice de son (11), et une pluralité de premiers trous aveugles (121) sont réalisés dans la première zone de soudage (12) ; le deuxième écran en tissu (20) comprend une deuxième zone transmettrice de son (21) et une deuxième zone de soudage (22) qui sont reliées entre elles ; une pluralité de deuxièmes trous traversants (211) sont réalisés dans la deuxième zone transmettrice de son (21), et une pluralité de deuxièmes trous aveugles (221) sont réalisés dans la deuxième zone de soudage (22) ; la deuxième zone de soudage (22) est adjacente à la première zone de soudage (12) ; et le ruban adhésif (30) est fixé à la deuxième zone adhésive (22) et à la première zone adhésive (12) pour relier le premier écran en tissu (10) et le deuxième écran en tissu (20). La réalisation d'une pluralité de premiers trous aveugles (121) dans la première zone de soudage (12) et d'une pluralité de deuxièmes trous aveugles (221) dans la deuxième zone de soudage (22) de l'écran de projection permet à la luminosité de l'écran de projection (1) d'être constante, améliorant ainsi l'effet d'affichage de l'écran de projection (1).
PCT/CN2021/095321 2020-05-22 2021-05-21 Écran de projection WO2021233444A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202020876290.7 2020-05-22
CN202020876290.7U CN212255999U (zh) 2020-05-22 2020-05-22 投影屏幕

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WO2021233444A1 true WO2021233444A1 (fr) 2021-11-25

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PCT/CN2021/095321 WO2021233444A1 (fr) 2020-05-22 2021-05-21 Écran de projection

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN212255999U (zh) * 2020-05-22 2020-12-29 深圳光峰科技股份有限公司 投影屏幕
CN214067571U (zh) * 2021-01-05 2021-08-27 深圳市时代华影科技股份有限公司 一种拼接式投影银幕

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JP2005326573A (ja) * 2004-05-13 2005-11-24 Ricoh Co Ltd 背面投射型画像表示装置・背面投射スクリーン
CN102692803A (zh) * 2011-03-22 2012-09-26 精工爱普生株式会社 屏幕的制造方法以及部分屏幕
CN202486493U (zh) * 2012-02-07 2012-10-10 天津三多水科技有限公司 一种投影幕布
CN102741744A (zh) * 2009-12-01 2012-10-17 鲁米尼特有限责任公司 用于显示二维和三维电影的投影银幕及其使用方法
CN202938253U (zh) * 2012-11-19 2013-05-15 厦门利德宝电子科技有限公司 Led基板盲孔形式的装配结构
CN110389496A (zh) * 2018-04-20 2019-10-29 深圳光峰科技股份有限公司 透声幕及其制造方法
CN212255999U (zh) * 2020-05-22 2020-12-29 深圳光峰科技股份有限公司 投影屏幕

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005326573A (ja) * 2004-05-13 2005-11-24 Ricoh Co Ltd 背面投射型画像表示装置・背面投射スクリーン
CN102741744A (zh) * 2009-12-01 2012-10-17 鲁米尼特有限责任公司 用于显示二维和三维电影的投影银幕及其使用方法
CN102692803A (zh) * 2011-03-22 2012-09-26 精工爱普生株式会社 屏幕的制造方法以及部分屏幕
CN202486493U (zh) * 2012-02-07 2012-10-10 天津三多水科技有限公司 一种投影幕布
CN202938253U (zh) * 2012-11-19 2013-05-15 厦门利德宝电子科技有限公司 Led基板盲孔形式的装配结构
CN110389496A (zh) * 2018-04-20 2019-10-29 深圳光峰科技股份有限公司 透声幕及其制造方法
CN212255999U (zh) * 2020-05-22 2020-12-29 深圳光峰科技股份有限公司 投影屏幕

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