Projection screen size selection
The first thing to consider when buying a home theater is the ratio of the screen. After deciding the ratio, the next issue to consider is the screen size and viewing distance. Although this issue varies from person to person, some of the suggestions here are worthy of reference.
It should be noted that we should sit too close to the curtain. For example, if you sit in the first row and watch the tennis match, then our head will keep turning and the eyes will be very tired. This is definitely a painful experience. And if your screen is too large, it will feel similar. The oversized image will give the audience a shocking feeling during the first thirty minutes of viewing, but watching it for a long time will be a burden. When you choose the projector and the corresponding screen, you can make a practical test, you can mark the desired model on the required wall, then place the seat at a certain distance you like, and experience the scene. The size of the screen marked. You can debug the image size and your viewing position until you feel comfortable.
Another thing to note is that the larger the image projected by the projector, the closer the seat is to the screen, and the more scanlines and artifacts there are. If you look at a two-foot-wide screen two feet away, you'll see a lot of flaws; but if you look at an image of the same size ten feet away, the effect will be much better - this is just a matter of projector scaling.
For XGA and WXGA projectors, viewing is the worst at a viewing distance of 1.5 times the screen width. Even though you can get great images, you will feel tired. And when the distance from the screen is equal to twice or more the width of the screen, you will enjoy very good image effects, and you will be minimized.
In the viewing distance of 1.5 times to 2 times the screen width, the closer to the screen, the clearer the screen, but at the same time there will be more defects. For XGA and WXGA projectors, the viewing distance of twice the screen width is the most suitable viewing location, and the image effects and screen size are just right. But everyone's preferences are always different, you can adjust them according to your preferences.
The above is the main basis for screen selection. Clearly, high-resolution projectors support larger screens and closer viewing distances without affecting image effects; conversely, low-resolution SVGA projectors are suitable for longer viewing distances to eliminate visible image artifacts.
The materials of the projection screen are mainly classified into two categories, namely, elastic curtains and woven curtains.
Glass bead curtain
Elastic screen, mainly including white plastic, gray plastic, special PVC and other materials, is the cloth surface used when tension is needed. The surface coating is smooth and grainless, so the optical imaging is equal to a thin surface, the resolution It is the highest, the sharpness is the best, the image seems to float out of the picture, commonly known as optical coating. This kind of curtain is also used in cinemas. According to different gains, each family has different products, and there are holes to become an optional item for the sound curtain.
The second category is woven curtains. These curtains are mainly made of a layer of woven fabric with different coatings, mainly white curtains, bead curtains and gray curtains. The surface usually affects imaging due to the weave texture, and the image quality is not so good. The disadvantages are that the resolution is not high and the resolution is weak. Stewart and other high-end curtains, these products are not the main force. Of course, there are also good, such as the ultra-fine weaving curtain of Judi, but only a very small number of imported curtains can be done, and the price is expensive.
In addition to the material factor, there are many types of home projection screens depending on the application method. You may choose according to your own needs.1. Electric cable screen
This kind of curtain is the most expensive in the household class. It adds a tension line on both sides of the electric screen to level the screen, while the upper and lower sides add strength by the heavy bottom edge. The benefits are of course flat and can be put away, and the structure of the whole curtain is very strong and very textured. The disadvantage is that it is expensive.
2. Fixed picture frame
Fixing the picture frame is to use a aluminum frame to make a frame similar to the frame, and then spring the curtain on the curtain to make the curtain flat. The advantage is flat, much cheaper than electric pull screens. The disadvantage is that it can not be collected, it is easy to be polluted by dust, and it is easy to oxidize and discolor when exposed to the air for a long time.
3. Hard projection screen
This kind of screen is usually ultra-high gain, the color is very bright and bright, but the angle of view is very small, there are hot spots. If the size is large, the center will be brighter, but the four corners are dark, and the problem of color shift is very serious. The curtain is more suitable for outdoor use in brighter environments, and is not suitable for players with high image quality requirements.
4. Electric screen
This is the most common screen. The advantage is that the price is cheap, the flatness is good, and the maintenance is easy. The curtain is evenly lowered from the two ends of the motor to ensure that the screen is not affected by external force. It has the characteristics of easy lifting and simple installation, and can maintain the curtain for a long time. Flatness, no ripples in long-term use.
5. Manual screen
This is also the most common screen. The advantage is that it is cheap and easy to install. It can be considered when the quality of the curtain is not high. The shortcoming is that during the long-term use, the “V†type ripple will appear due to the central pull-down force and other factors, which will affect the screen. Flatness.
6. White wall surface
Of course, it can be used, but it is recommended not to save this money, otherwise the performance of the projector can not be fully displayed.
The gray screen is often referred to as the “high-contrast screenâ€. Its working principle is that the gray screen can absorb more ambient light than the white screen (the white screen does not have this function), so that the black level on the screen can be maintained and projected. The white color on the screen can still be kept white, while the black color is darkened due to the interference of ambient light, which directly leads to an increase in the contrast between the black and white contrast on the screen, thereby achieving the purpose of improving the contrast.
However, with ambient light fully controllable, white screens are the best choice. However, the meaning of “completely controllable ambient light†does not mean that the lighting in the audio-visual room is turned off. We must also consider the potential impact of the audio-visual room itself. If you want to make your home theater audio-visual room like a cinema, with dark walls, dark ceilings, dark furniture, and even dark carpets, then, no need to say, white screens are the best choice. But the establishment of such an audio-visual room - a classic in fantasy - is just a dream of fans, because in practice few people have such a separate dedicated room.
In reality, the projection system of the home theater is usually located in the living room or multi-purpose entertainment room, and the walls, ceilings or furniture of the room are basically painted with paint that has reflection or other influence on the light, and even some pairs of curtains. Light also reflects... Therefore, even if all the lights in the room are turned off, the light reflected from the projection screen passes through the walls, ceilings, furniture, curtains... and is reflected on the screen. In this case, if it is a white curtain, the screen will have a fog, which will make the image blurred, and the gray screen can eliminate the interference of these lights, so that the screen maintains a darker black level and the contrast is stronger. The picture is more transparent, clearer and higher! (Of course, the gray screen is not likely to eliminate the interference of light 100%, so proper shading will bring you unexpected effects, but the white screen does not have this function.)
In summary, the selection of gray screens for home projection screens is most suitable, and the selection of elastic screen materials is the best, and the selection of electric screens is the most cost-effective. In addition, the picture frame has good flatness and high cost performance, but the shortcomings are also obvious. The comprehensive performance is an alternative to the electric screen.
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