Moreover, most modern video projectors are not designed to fit sideways – violations of the heat transfer power of projection lamps. Besides the usual form, shaped ‘vertical-overs’, where one can hardly find. Most often, this special promotional or entertainment projects, sometimes – the placards. So, if the screen we just need to play normal video, sd or hd, it remains to choose between 4:3 and 16:9. Usually, in such cases, the recommended 4:3 ratio as the most versatile. ‘On the 4:3 screen is always possible to display a 16:9 image, filling the screen width. And if you have a collapsible screen, you can deploy it so much as needed to play a specific format. ” Arguments are not indisputable. Firstly, if you align the format and the width, the size of individual pixel sd increase by 2.67 times relative to the pixel in hd. In the case of alignment adjustment, the projected increase is only 1.88 times. But the larger the pixel on the screen, the greater the probability of grain images. Second, keep the mobile screen is not deployed until the end – it is necessary try.
If the screen is stationary and easy to take any intermediate position, it would still have to lift the optical axis of the projector in HD-mode. Seems more reasonable solution: to choose the format of the screen basic format of the projector. The very same format is chosen so that it matches your needs: 16:9 – if largely expected to show large-format videos (movies or HDTV) and 4:3 – if the major television will format. Ca. auth. Projection Screen Size is usually chosen so that its breadth was not more than half the distance from the screen to the viewer. If the source is in favor of standard video quality is fears that the pixilated image will be too noticeable, you can use the ‘rule of three diagonal’ – the diagonal of the screen should be three times less than the distance from the screen to the audience. Matte and gloss What type of coverage to prefer? Screens with a matte finish give a uniform diffuse scattering of incident light. The image can be clearly seen from any angle, the screen lit more evenly. These screens are simpler, cheaper and more universal. Glossy screens are mirrored and reverse reflection (reflective). The first act like an ordinary mirror: the angle of incidence equals the angle of its reflection. The projector is placed under the ceiling, and screen image is reflected down to the audience. Reflective coating comprises reflecting microspheres. The reflected beam returns to the same point, where he was sent to the screen – the projector is located on the shelf before audience. Both types of coatings tend to reduce the angles of viewing comfort and an increase in uneven illumination of the screen. Instead we get a more vivid and sharp image, but is what they say about the coefficient light amplification shield.
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