[In-depth understanding of home theater projection screens and the key points of purchase] Home projection screen purchase common sense
In recent years, projectors have become more and more popular. It has become everyone's consensus that projectors should not be absent when constructing home theaters. However, most people know a lot about projectors, but they don't know much about projection screens. Everyone knows that projectors are divided into home and business. So many users will have this question, whether the projection screen is also divided into home and business, the answer is yes.
From an optical point of view, no matter what the projector, the projected image is formed by the light reflected by the projection screen to the human eye. Since the projection screen is a light-receiving surface, it is passive from a physical point of view. Therefore, different screen materials and viewing angles have different reflection strength, spectrum and transmission methods of light, so that the image reaching our eyes will be Make a difference. Especially for the requirements of home theater, the image must not only be seen clearly, but also have higher requirements in terms of brightness, contrast, color, detail, and noise.
Below we will give you a brief introduction to the projection screen for home use and related key knowledge.
Gain and viewing angle
Gain is an important indicator to consider the amount of light reflected on the screen surface. The gain of a uniformly rough white surface is usually defined as 1. The brightness of the light reflected on the screen surface is compared with it to get the gain value of the screen. When viewing the screen vertically, the larger the gain value, the brighter the image. Of course, the projector and the projection screen still need to be matched, and not any projector will have a good image effect with a projection screen. If a high-brightness projector is equipped with a high-gain projection screen, the projected image may be white, and if a low-brightness projector is equipped with a low-gain screen, the image will be It was dark. Therefore, it is very important to choose a screen with proper gain for the projector. In addition, to understand the gain of different screens, you need to understand the material of the screen.
Different screen materials have different brightness gains. Generally, the screens of home theater screens can be divided into three types: white plastic, glass beads and pearls. The white plastic screen belongs to the diffuse reflection screen, which is characterized by low brightness gain (generally the gain value is about 1.0), wide viewing angle, and uniform light diffusion. It is suitable for more people to watch at the same time, but it needs a projector with a slightly higher brightness. The reflected light of the glass bead screen will be reflected back in the same direction of the incident light, so it has the characteristics of high gain (gain value above 2.0). You can see images with good brightness, contrast, and layering near the front of the screen. . The disadvantage is that the viewing angle of the glass bead screen is small, and the viewing effect of the viewer sitting on the outermost side will be affected to a certain extent when viewed by multiple people. The pearl screen is a reflective screen in which light diverges in the opposite direction of the incident light. Its brightness gain and viewing angle are based on the above two. It is a screen with balanced brightness and field of view, and the projector is most suitable for hanging on the ceiling.
Size and width ratio
After introducing gain and viewing angle, one more consideration for everyone is the choice of screen size. The size of the screen generally refers to the length of its diagonal. The size of the projection screen should be determined according to the size of the theater space. Generally speaking, a room with an area of u200bu200b20 square meters or more can choose a screen of 100 inches or more; a room of 15-20 square meters can choose an 80-100 inch screen; for a room of 10-15 square meters, a 60-80 inch screen can be selected. . Because the best viewing position for the front projection should be at a distance of about 1.5 times the diagonal size of the screen, that is to say, if it is a 100-inch 4:3 aspect ratio screen, the position of the seat from the screen should be About 3.8 meters (100*0.0254*1.5). If the distance is too close or the screen is too large, it will cause the eyes to keep turning when watching the movie because they can't come over, and it will be very tired after a long time.
In contrast, the aspect ratio of the screen is much easier to determine. If you often watch 16:9 format programs such as DVDs, it is more appropriate to choose a 16:9 aspect ratio screen; if you often use a computer and other 4:3 format signal sources, choose a 4:3 ratio screen. It's not impossible.
Placement method and technology level
In addition to the above knowledge needs to be clear, some understanding of how to place it is also needed. The screen can be divided into electric type, manual type, frame type, bracket type and ground pull type according to different setting methods. Electric type and manual type are mostly wall-mounted curtains. Like the frame type, they can be set on the wall and retracted through electric remote control or manual operation. The frame curtain is directly mounted on the wall without being retracted. If you need to move or carry at any time, you can also choose the bracket screen or the floor screen, which can be pulled up and adjusted when setting up a home theater.
The last thing to mention is the level of manufacturing technology of the screen. The difference in the quality of the same screen will directly affect the quality of the image. When we get the screen, we can pay attention to whether there are deformations and curls on both sides of the screen, whether there are inverted characters or wrinkles on the surface of the screen, whether there are stains on the surface of the screen, whether the screen rises and falls smoothly, whether the screen is flat after being supported, etc. . In short, remember that having a good screen will make your projector even more powerful and take you to fully experience the real enjoyment of a home theater.