Before the talk, the author believes that consumers first need to understand the type of projection screen and the screen material, because different kinds of curtains and screen materials of different materials will have different auxiliary effects on the projector. Here, the author simply said. First of all, according to the usage mode, the projection screen has the following classifications: fast folding screen, electric screen, hand-locking screen, bracket screen, cable screen, floor screen, frame screen, etc.; according to the application materials are also varied, glass bead screen Pearl curtains, white screens, gray screens, screens, silver-spherical screens, etc. are all prevalent.
Usually, when choosing a home projection screen, you can consider buying a white plastic screen, a bead curtain or a gray screen. The white plastic screen can display the best image, text and data effects when the surrounding lights are adjustable. The fiber is evenly dispersed and projected into each display area, the color is natural and realistic, the brightness is 1-1.5 times the gain, and the viewing angle is 50°. The effect is excellent when the ambient light (including the reflection of walls and ceilings) is controllable.
The glass bead curtain is treated with five special layers of special materials. The glass beads (glass powder) are evenly distributed on the surface of the screen to increase the reflection brightness. The text, images and data are bright and delicate, and the brightness is up to 2-2.5 times. The viewing angle is 30°, but the increase in brightness will lose a certain contrast; the gray screen is also called “high-contrast screenâ€, and the gray screen can absorb more ambient light than the white screen (the white screen does not have this function). ), this allows the black level on the screen to be maintained, the white color on the projection screen can still remain white, and the black color is reduced 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. In order to achieve the purpose of improving contrast, the gray screen is the mainstream screen of the current home market.
In addition, one of the more important points when choosing a projection screen is to maintain the flatness of the screen for a long time. In this regard, the hard screen is a good choice. Because the hard screen uses the four-sided frame to completely straighten the curtain material, it avoids the crepe caused by the frequent scrolling and thus affects the image performance. However, if you choose a manual screen, you must pay attention to the material used to straighten the projection screen at the bottom of the screen and the screen. The heavier the sill at the bottom of the screen, the more the tension is enough, the screen is straight and the image is heavy. The better the quality is now: in the same way, the materials on both sides of the screen can pull the curtain straighter, and the image reproduction of the projection screen is also ideal. Some of the cheap projection screens have different flexibility due to the lack of elasticity of the curtain material. Inward, this will affect the quality of the image.
For enthusiasts, the choice of projection screen can also be based on the specifications of CSMS (CinemaStandards Measurement System). Foot-lambert is a unit that measures the luminosity of a particular image. The standard picture should have 1 lumen per 1 square foot. The Foot-lambert transition makes it easier to compare the projector's light to the average brightness of the projection screen, as well as to measure the color temperature to pick the projection screen of the appropriate gain. When the brightness of the projector is high, the color temperature and the gain of the projection screen will also increase.
With the SMPTE standard, the minimum brightness is set at 16 foot-lambert, while the home theater color temperature standard is 6500K. One of the measurable foot-lambert instruments is the PhotoResearchSpectraColorimeter. It should be noted that when the size of the projection screen is larger, the coefficient of foot-lambert will be less; the gain of the projection screen is high, the coefficient of foot-lambert will increase; the negative gain projection screen with better dark level Will reduce the coefficient of foot-lambert; the larger the diagonal size, the lighterness will be 1/4 of the smaller size projection screen.
In terms of the choice of screen ratio, it is decided according to the actual needs of users. Ordinary computer monitors and data signals and ordinary TV signals have an aspect ratio of 4:3 or 1.33, and movie and DVD and HDTV have an aspect ratio of 16:9 or 1.78. When the aspect ratio of the input source image is different from the aspect ratio supported by the display device, there are cases where the image is distorted and missing. In other words, if you spend most of your time watching TV, you should choose a 4:3 screen. If you want to watch movies most of the time, it is best to choose 16:9 or even 2.35:1. .
Finally, the choice of screen size. At this point, users should never blindly pursue large sizes, which must be determined according to their own room size. Because the larger the screen size, the farther the viewing distance is, and if your room is smaller and you choose a larger screen, it will not only achieve better visual effects, but also make your eyes feel very tired. Not conducive to the health of the eyes. The shortest viewing distance should be twice the width of the projection screen; the farthest viewing distance is six times the width of the projection screen. The formula for the most ideal viewing distance: the shortest viewing distance /2 and the farthest viewing distance /2.
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