How to choose the installation method of curtain wall is introduced and explained in detail.

Choose the best screen size and position.

Choosing the best screen size mainly depends on the area of space used and the number and location of audience seats. The first rule is to choose a screen suitable for the audience-not a screen suitable for the projector, that is, to put the audience's visual experience first.

The following are some references for selecting screen size.

1. The screen height should be such that the audience in each row can clearly see the contents of the projection screen.

2. The distance from the screen to the first row of seats should be more than twice the height of the screen.

3. The distance from the bottom of the screen to the ground is about1.5m. ..

Application of Projection Screen —— How to Choose Projection Screen Correctly

Facing the large screen display system, many users are often worried about the correct choice of projection screen. Improper matching of projector and screen will greatly reduce our display screen. So after we understand the characteristics and applications of screen, this problem should be solved. When determining the projector, the following nine aspects should be considered correctly: 1, front projection and rear projection mode 2, projector brightness 3, projector contrast 4, projector optical characteristics 5, screen size requirement 6, projector lens ratio 7, screen installation mode 8, projection environment characteristics 9, use and function.

The following will explain the importance of the above nine aspects respectively, but please consider them comprehensively when matching. Missing one may affect the perfection of the projection screen.

1, front and back projection mode

The front projection and rear projection modes of large screen projection system are very important for screen selection. Because at present, the international screen has not reached the screen that can be used on both sides. Therefore, we can only choose one of the positive and negative projection methods according to our own usage. Different projection methods determine the different screen choices. Choose a matching projection screen for different projection methods. Because orthographic projection is sensitive to the influence of ambient light, it is suggested to choose the calculated value with slightly higher projector brightness when selecting the projector. At the same time, if it is necessary to build a high-grade conference room, it is recommended to use qualified users and try to adopt the rear projection method, which is not affected by ambient light, and both meeting notes and meeting photography can get good results. If there are no other restrictions on the gain of the screen, it is recommended to choose a screen with a slightly higher gain.

2, the brightness of the projector

The brightness of the projector directly affects the viewing effect of the picture. According to the ambient light, the fatigue degree of people's eyes and the general lighting situation of the conference room, it is generally recommended that the brightness of the screen surface be around 700ansi/ m2, which can also be changed according to the ambient light. Especially in the case of taking pictures, the ambient light is relatively strong, and the brightness of the screen surface needs to be improved appropriately. The brightness L per unit area of the screen surface is calculated as follows: L=B/S, where: b is the normal brightness ANSI of the projector, and s is the square meter of the projected screen area.

3. Contrast of the projector

With the continuous innovation of projection technology, the contrast of projector is also improving. However, in order to better improve the image quality and make up for the problems of the projector itself, we have also improved the screen. Different gray levels on the screen surface will contribute to the contrast and gray level of the projector, thus making the projected picture more colorful. Several internationally renowned projection screen companies have introduced gray screens. The deepening of the color of the rear projection hard screen material is itself improving the contrast. Similarly, the improvement of contrast sacrifices the relative gain. The screen is not as white as possible, the key is according to our needs.

4. Optical characteristics of the projector

The optical characteristics of the projector mainly refer to the projection mode of the projector, and the projected picture refers to two types: on-axis (the position where the projector lens faces the center of the screen and the light is evenly emitted up and down) and off-axis (the position where the projector lens faces the upper or lower edge of the screen). Because the optical screen has a viewing angle and the Fresnel optical screen also has a lens center, the projection mode of all projectors directly affects the quality of the screen picture. Users who use Fresnel screen suggest using an on-axis projector, or choose a diffuse reflection screen with better quality. If the projector is off-axis, it is recommended to use a front projection screen or a diffuse reflection screen, and it is not recommended to use a Fresnel optical lens screen.

5. Projected image size

The size of the projection screen determines whether we choose projection methods such as rear projection and front projection. Projector is also required: the brightness of the projector is required to meet the requirements of image quality. Only when the size is determined can the appropriate screen be selected. Some hard screens are too big. When selecting them, please consider whether the freight channel of screen transportation is smooth. For users who need to display a large screen, it is recommended to choose a soft screen to facilitate transportation and installation. At present, the overall size of the internationally renowned Stewart Screen company's soft screen can reach 27m x 12m, and both the rear projection screen and the front projection screen have very good viewing angle and gain.

6. Projector lens ratio

The lens ratio of the projector directly affects the projection distance, and the relationship is as follows: d=w*f+a, where d is the projection distance, f is the lens focal length of the projector, w is the screen image width, and a is the correction value of the projector. Similarly, in order to avoid the sunlight effect, Fresnel optical screens and rear projection diffuse reflection screens generally recommend using lenses above 1.2: 1. However, with the development of screen technology, there are several manufacturers' screens, whether diffuse reflection or Fresnel optical screen, which can suppress or weaken the sunlight effect well. The lens can be greater than 0.73: 1. Wherein the Fresnel optical rear projection screen has a screen focal length. In today's society, land is precious, so when building a rear projection project, we usually use a short focal length screen to reduce the space of the rear projection room. (Similarly, adding a reflection system can save space for rear projection. Fresnel optical screens below 180 inch generally have three focal lengths. Please consult the manufacturer for specific and accurate parameters. 180 and 200 inches generally have focal lengths. Similarly, the focal length can be customized and the cost is higher. Only when the projection distance d coincides with the focal length of the screen, the quality of the projected picture will achieve better results.

7. Installation method of screen

Different screen installation methods require different screens. Telescopic screen should be made of soft material. There are fixed soft screens and hard screens. The height of the screen installed from the ground is different, which also requires the vertical viewing angle of the screen. The vertical viewing angle of soft rear projection screen and diffuse reflection screen is relatively large. The vertical viewing angle of Fresnel optical screen is only 8- 12 degrees, so please pay attention when installing. It is suggested that the vertical tilt angle of hard screen should be less than 15 degrees. The picture on the right shows how to install several screens.

8. Influence of projected ambient light

Ambient light that needs to install a large screen has different requirements for the screen. Meeting room: Generally, we need to appreciate the contents of the big screen, take notes and take photos at the same time, so we need high projection brightness and high screen gain, so it is best to use it as a rear projection. At the same time, as a whole, the screen is better, and the picture has no sense of fragmentation. The requirements for ambient light in the monitoring room are slightly reduced. What the imaging room needs is a high-quality picture, so we need to choose a screen with good contrast, lower gain and softer picture. Because the ambient light is dim. Like, the cinema didn't turn on the light to watch movies!

9, use and function

The purpose and function of the screen also mainly affect the display and selection of the screen. Mainly divided into: home applications, commercial applications, control room applications, simulation applications and other different use environments and functions. Please select the appropriate screen aspect ratio according to the purpose of the signal source. For example, the home theater uses the projection screen of 16:9 to watch videos, while the control room is mainly used to display high-resolution images, so the screen with higher resolution is selected.

In short, no matter where you use it-from aerospace to art to home theater-the projection screen you choose must meet the most demanding optical and installation requirements and have a perfect display effect. In addition to a wide variety of standard size products, all manufacturers can provide product customization, and in this respect, Stewart Screen Company of the United States is unique in product customization to meet the most special architectural and technical requirements. Finally, projection screen technology and projector technology will continue to develop together, and perfect pictures will continue to innovate and reappear! In order to show the best effect to meet the needs of the audience, the projector should pay attention to choosing different screen materials. For a device with low light output, such as a slide projector, glass bead fabrics with high emissivity (gain) parameters should be selected. For most projectors with high brightness and high resolution, in order to achieve the best projection effect, glass beads with higher reflectivity (gain) than white plastic should also be preferred. . The projection format of each projection device should match the corresponding size mode (scale). For example, the mode with the aspect ratio of 1: 1 is suitable for slide projectors.

For a family or living room of 40-50 square meters, it is recommended that the brightness of the projector should be 1000 lumens and the curtain should be over 60 inches.

For a small conference room or standard classroom of 60- 100 square meters, it is recommended that the brightness of the projector should be above 1500 lumens and the size of the curtain should be above 100 inch.

In medium-sized conference rooms and lecture halls with a square meter of 120-200, it is suggested that the projector should choose products with brightness above 2000 lumens and curtain above 100 inch. It is suggested that the brightness of the projector should be between 2000 and 3000 lumens, and the curtain 120 inch ~ 150 inch.

For a 300-square-meter conference room or auditorium, the projector should be a professional engineering machine with more than 3,000 lumens, and the curtain should be a professional product with more than 200 inches.

Pay attention to when buying new projection curtains, and what are the precautions when choosing curtains:

Black spots-foreign objects stuck on the screen surface that can't be swept away, making the light unable to reflect.

Notch-The protrusion presses on the surface, causing the screen to sink.

Wrinkling-screen wrinkling is caused by careless use of screen in engineering.

Stains-foreign body adhesion and other reasons, resulting in printing on the mesh cloth.

Lines-lines formed by uneven weaving lines.

Dirty-due to carelessness in the project, fingerprints, oil stains and other dirty things are printed on the screen cloth.

Foreign matter-also known as thread-is attached to the screen surface and cannot be removed.

Pinhole-a needle-like hole found on the back of mesh cloth under the irradiation of slide projector.

Scratches-The front and back of the screen are scratched due to careless use of mesh cloth in the project.

Line-the line exposed in the white curtain area.

Bubble-bubble formed by foreign matter mixed in the middle layer of screen.