WO2019153637A1

WO2019153637A1 - Projection screen

Info

Publication number: WO2019153637A1
Application number: PCT/CN2018/094728
Authority: WO
Inventors: 王霖; 张红秀; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2018-02-08
Filing date: 2018-07-06
Publication date: 2019-08-15
Also published as: CN208044292U

Abstract

A projection screen (1), comprising a first region (101), a second region (102), and a third region (103). The first region (101) is located on the left side of the projection screen (1); the third region (103) is located on the right side of the projection screen (1); the second region (102) is located at the middle of the projection screen (1); the first to third regions (101, 102, 103) are all provided with sound transmission holes (H); the number of the sound transmission holes (H) per unit area in the second region (102) is greater than the number of the sound transmission holes (H) per unit area in the first and third regions (101, 103). The problems of non-uniform brightness and poor sound transmission effect of the projection screen (1) are solved, and the brightness uniformity and sound transmission quality of the projection screen (1) are improved.

Description

Projection screen

Technical field

The utility model relates to a screen, in particular to a projection screen.

Background technique

Most of the existing projection screens are wider than the vertical height, and the projectors are mostly stand-alone devices. When the image is projected, it is in the middle of the screen. This will inevitably lead to the brightness of the screen in the middle of the screen being higher than the brightness of the two sides. Moreover, because the sound equipment is usually required after the curtain, the quality of the sound transmission mainly depends on the opening area of the screen. According to the national standard, the sound of the movie screen is required: the sound frequency attenuation at 8 kHz is less than 3 db, and the sound at 12.5 kHz. The attenuation is less than 6db, so the opening area of the existing screen surface is generally selected in the range of 2%-5%, and the opening of these sound-permeable holes will further affect the brightness and sound quality of the projection screen itself, resulting in projection. The problem that the screen picture brightness is uneven and the sound transmission effect is not good.

Utility model content

The utility model mainly provides a projection screen, which aims to solve the problem that the current projection screen brightness is uneven and the sound transmission effect is not good.

In order to solve the above technical problem, the technical solution adopted by the present invention is to provide a projection screen, the projection screen includes a first area, a second area, and a third area, wherein the first area is located on the projection screen. a left side position adjacent to a left edge of the projection screen, the third area being located at a right side of the projection screen and adjacent to a right edge of the projection screen, the second area being located at an intermediate position of the projection screen And located between the first region and the third region, the first to third regions are each provided with a sound-transmitting hole, and the opening ratio of the sound-permeable hole per unit area of the second region is higher than The opening ratio of the sound-permeable holes per unit area of the first and third regions.

The utility model has the beneficial effects that the whole brightness brightness of the projection screen is solved by setting the first to third regions for the projection screen and making the opening ratio of the sound-permeable holes of the second region higher than the first region and the third region. The problem of unevenness and poor sound transmission improves the phenomenon that the brightness of the projection screen in the middle of the projection screen is higher than the brightness on both sides, which improves the brightness uniformity and sound transmission quality of the projection screen.

DRAWINGS

1 is a schematic structural view of a projection screen of the present invention;

2 to 3 are schematic structural views of the horizontal projection of the projection screen of the present invention;

4a-4c are schematic views of the opening ratio of the projection screen of the present invention.

Detailed ways

Please refer to FIG. 1 , which is a schematic structural view of the projection screen of the present invention. As shown in FIG. 1 , the projection screen 1 of the present invention includes a first area 101 , a second area 102 , and a third area 103 , wherein the first area 101 is located at the left side of the projection screen 1 and is close to the left edge of the projection screen 1 . L1, the third area 103 is located at the right side of the projection screen 1 and is close to the right edge R1 of the projection screen 1. The second area 102 is located at an intermediate position of the projection screen 1 and is located between the first area 101 and the third area 103, projection The curtain 1 includes a plurality of sound-permeable holes H. Generally, the projector reflected by the second area 102 has a relatively large amount of light, and the light of the area enters the eyes of the viewer. The light reflected by the first area 101 and the third area 103 is relatively smaller than the second area 102. The light entering the viewer's eyes is relatively small, and thus the brightness of the screen of the projection screen 1 is uneven. Moreover, usually, an audio device is arranged behind the projection screen 1. In order to make the overall brightness of the projection screen 1 uniform and the sound device provided on the back of the projection screen 1 has a good sound transmission effect, it is necessary to provide a sound transmission hole H on the projection screen 1 to When the projection screen 1 receives light, the light will pass through the sound transmission hole H without reflection, thereby reducing the reflectivity of the projection screen 1 to the projection and incident light, and the sound will be transmitted through the sound transmission hole H. Therefore, the sound transmission hole H is The larger the proportion of the area occupied, that is, the larger the opening ratio, the more it affects the brightness of the screen of the projection screen 1, so that it becomes lower than the original brightness, and the sound transmission effect is good; on the contrary, the sound hole H occupies The smaller the area ratio, that is, the smaller the aperture ratio, the less the influence on the screen brightness of the projection screen 1 and the poor sound transmission effect. With this feature, the overall picture brightness of the first area 101, the second area 102, and the third area 103 can be uniform, and the brightness uniformity of the overall projection screen 1 can be improved by increasing the brightness of the first area 101 and the third area 103. And according to the sound field distribution, the sound transmission effect of the audio equipment is better.

The embodiment adopts a method in which the opening ratio of the sound-permeable holes H of the first region 101 and the third region 103 is smaller than the opening ratio of the sound-permeable holes H of the second region 102. Considering that the brightness of the picture is uniformly diffused outwardly, the aperture ratio should also be gradually lowered from the middle to both sides or stepped down to further make the brightness of the picture uniform, that is, the first area 101 The opening ratio near the left edge L1 of the projection screen 1 is smaller than the opening ratio of the first region 101 away from the left edge L1 of the projection screen 1; the opening ratio of the third region 103 near the right edge R1 of the projection screen 1 is smaller than the third region. 103 is away from the opening ratio of the right edge R1 of the projection screen 1. The opening ratio of the second region 102 may not change, or the opening ratio may gradually decrease or stepwise decrease from the middle to both sides in the region.

Please refer to FIG. 2 and FIG. 3 , which are schematic structural diagrams of the horizontal splicing of the projection screen of the present invention. As shown in FIG. 2, when the projection screen 1 is spliced into a projection screen by a plurality of screens, the opening ratio is gradually changed from the middle to the two sides in a gradually changing manner. It is also possible to adopt a stepwise variation in which the opening ratio is gradually reduced from the middle to both sides. For example, the opening ratio of the first sub-region 1011 and the fourth sub-region 1032 is 0.6-1%, the opening ratio of the second sub-region 1012 and the third sub-region 1031 is 0.8-1%, and the opening of the second region 102 is The rate is 0.8-2%. When opening the hole on the projection screen 1, it is necessary to ensure that the opening ratio is reduced stepwise from the middle to both sides. The above is an example of the splicing of five curtain materials. When the size of the projection screen is large, more pieces of the same screen material with the same length and the same length are needed to be spliced into a complete curtain.

As shown in FIG. 3, in the longitudinal splicing, the first region 101 to the third region 103 may each be formed by splicing a plurality of curtain materials, for example, the first region 101 is composed of a first sub-region 1011 and a second sub-region 1012. The three sub-regions 1013 are spliced, the second region 102 is formed by merging the fourth sub-region 1021 and the fifth sub-region 1022, and the third region 103 is composed of a sixth sub-region 1031, a seventh sub-region 1032, and an eighth sub-region 1033. Stitched together. In Fig. 3, only the schematic diagram is shown. The actual number or size of the splicing depends on the width of the curtain material and the size of the projection screen 1. For example, for a projection screen of 8 m x 16 m, the width of a single curtain material is about 1 m. Then, the coil material needs to be cut into 16 blocks of 8 meters long and 1 meter wide, and then formed by lateral splicing. Moreover, FIG. 3 shows the projection screen 1 having a horizontal width greater than the vertical height. If the projection screen 1 is changed to a projection screen having a horizontal width smaller than the vertical height due to actual needs, the splicing manner of the complete curtain will also be changed to vertical splicing, first. The region 101 and the third region 103 will be located at the upper and lower ends of the second region 102.

The opening ratio can be expressed in the following three ways: (1) In the case where the aperture of the sound-permeable hole H per unit area is the same, the density of the sound-permeable hole H is larger, that is, the denser the sound-permeable hole H is arranged, The larger the opening ratio is; conversely, the smaller the density of the sound-permeable holes H is, the thinner the arrangement of the sound-permeable holes H is, and the smaller the opening ratio is; (2) the number of sound-permeable holes H per unit area is the same as the hole spacing In the case where the aperture of the sound-permeable hole H is larger, the aperture ratio is larger; on the contrary, the smaller the aperture of the sound-permeable aperture H is, the smaller the aperture ratio is; (3) the aperture of the sound-permeable aperture H per unit area is the same, In the case where the pitch between adjacent two sound-permeable holes H in each region is the same, the larger the number of sound-permeable holes H, the larger the opening ratio; conversely, the smaller the number of sound-permeable holes H, the higher the opening ratio small.

Please refer to FIG. 4a - FIG. 4c, which are schematic diagrams showing the opening ratio of the projection screen of the present invention. In order to make the opening ratio of the first region 101 and the third region 103 smaller than the opening ratio of the second region 102, it may be set as follows: (1) as shown in FIG. 4a, the first region 101, the second region 102, and the third region In the case where the apertures of the sound-permeable holes H of the region 103 are all the same, the density of the sound-permeable holes H per unit area of the first region 101 and the third region 103 is smaller than the density of the sound-permeable holes H per unit area of the second region 102. (2) as shown in FIG. 4b, in the case where the number of the sound-permeable holes H of the first region 101, the second region 102, and the third region 103 is the same, and the pitch of the two sound-permeable holes H adjacent to each region is the same, Or if the density of the sound-permeable holes H per unit area is the same, the apertures of the sound-permeable holes H of the first region 101 and the third region 103 are smaller than the apertures of the sound-permeable holes H of the second region 102; (3) as shown in FIG. 4c As shown in the first region 101, the second region 102, and the third region 103, the apertures of the sound-permeable holes H are the same, and the apertures of the two sound-permeable holes H adjacent to each region are the same, then the first region 101 and the first region The number of the sound transmission holes H of the three regions 103 is smaller than the number of the sound transmission holes H of the second region 102. In the above three manners, the opening ratio of the first region 101 and the third region 103 is smaller than the opening ratio of the second region 102, wherein the opening ratio of the second region 102 is 0.8-2%, and the first region The opening ratio of the 101 and the third region 103 is 0.6 to 1%.

However, the audio equipment is often placed behind the projection screen 1. In order to save the installation space of the screen, the speaker is placed as close as possible to the back of the screen, and the distance is in the range of 0.5 m to 2 m. The closer the general audio equipment is to the surface of the screen, the greater the effect of the opening ratio of the screen block closest to the audio device on the overall sound transmission effect. In order to balance the sound transmission effect and the uniformity of the brightness of the sound device placed on the projection screen 1 at the same time, it is also necessary to adjust the distribution of the sound transmission hole H of the projection screen 1, and the opening ratio of the projection screen 1 is larger. The better the sound transmission effect of the audio equipment, on the contrary, the smaller the aperture ratio of the projection screen 1, the worse the sound transmission effect of the audio equipment.

If the audio equipment is centrally placed in the middle area of the projection screen 1, in order to enable the rendering effect of the picture and the audio equipment to be optimal, the aperture ratio of the second area 102 can be made 0.8-2%, the first area 101 and The opening ratio of the third region 103 is 0.6-1%. Specifically, the opening ratio of the first sub-region 1011 and the fourth sub-region 1032 is maintained at 0.6-1%, and the second sub-region 1012 and the third sub-region The opening ratio of the region 1031 is maintained at 0.8-1% to balance the screen brightness and acoustic effect between the first region 101, the second region 102, and the third region 103.

If the audio equipment is placed in the middle position and both sides of the projection screen 1 at the same time, it is necessary to consider a trade-off between the sound transmission effect and the screen brightness. In order to optimize the rendering effect of the picture and the acoustic device, the aperture ratio of the second region 102 can be maintained at 0.8-2%, and the aperture ratio of the first region 101 and the third region 103 is maintained at least 0.6- In the 2% mode, specifically, the opening ratio of the first sub-region 1011 and the fourth sub-region 1032 is maintained at at least 0.6-2%, and the opening ratio of the second sub-region 1012 and the third sub-region 1031 is maintained at 0.8- 1% to evenly balance the picture and acoustic effects between the first area 101, the second area 102, and the third area 103.

In this embodiment, the sound-transmitting holes H are arranged in a rectangular array, a diamond array, and a hexagonal array. The sound-permeable hole H has a pore diameter of 0.1 to 3 mm, and the adjacent two sound-permeable holes H have a pitch of 5 to 50 times the aperture.

The utility model solves the problem that the overall brightness of the projection screen is low and the brightness is uneven by setting the first to third regions for the projection screen and setting the opening ratio of the sound-permeable holes of the first region and the third region to be lower than the second region. The problem of poor problem and sound transmission effect avoids the phenomenon that the brightness of the projection screen is low overall and the brightness of the middle is higher than the brightness of both sides due to the sound hole, which improves the uniformity and sound quality of the brightness of the projection screen.

The above is only the embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. Any equivalent structure or equivalent process transformation made by using the specification and the drawings of the present invention, or directly or indirectly applied to other related The technical field is equally included in the scope of patent protection of the present invention. The above is only the embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. Any equivalent structure or equivalent process transformation made by using the description of the utility model and the drawings, or directly or indirectly applied to other The related technical fields are all included in the scope of patent protection of the present invention.

Claims

A projection screen, wherein the projection screen comprises a first area, a second area, and a third area, wherein the first area is located at a left side of the projection screen and near a left edge of the projection screen The third area is located at a right side of the projection screen and adjacent to a right edge of the projection screen, and the second area is located at an intermediate position of the projection screen and is located at the first area and the third Between the regions, the first to third regions are each provided with a sound-permeable hole, and the opening ratio of the sound-permeable holes per unit area of the second region is higher than the unit area of the first and third regions The opening ratio of the sound hole.
The projection screen according to claim 1, wherein in the case where the apertures of the sound transmission holes are the same, the density of the sound transmission holes of the first region is smaller than the first and third regions in a unit area. The density of the sound hole.
The projection screen according to claim 1, wherein in the case where the pitches of the two adjacent sound-permeable holes in the respective regions are the same and the same number, the sound-permeable holes of the second region in the unit area The aperture is larger than the aperture of the sound-permeable apertures of the first and third regions.
The projection screen according to claim 1, wherein the unit of the second area is the same in the case where the aperture of the sound-transmitting hole and the pitch of two adjacent sound-permeable holes of the respective regions are the same The number of sound-permeable holes in the area is greater than the number of sound-permeable holes per unit area of the first area and the third area.
A projection screen according to claim 1, wherein said second area is provided with an audio device, and said first and third areas are not provided with an audio device.
The projection screen according to claim 5, wherein the second region has an opening ratio of 0.8 to 2%, and the first and third regions have an opening ratio of 0.6 to 1%.
A projection screen according to claim 1, wherein said first to third regions are each provided with a speaker.
The projection screen according to claim 7, wherein the second region has an opening ratio of 0.8 to 2% or more, and the first and third regions have an opening ratio of 0.6 to 2%.
The projection screen of claim 1 wherein said sound permeable apertures are arranged in a rectangular array, a diamond array, and a hexagonal array.
The projection screen according to claim 1, wherein the sound-permeable aperture has a hole diameter of 0.1 to 3 mm, and the adjacent two sound-permeable holes have a pitch of 5 to 50 times the aperture.