Moreover, most modern video projectors are not designed for the installation side – being violated modes of heat transfer tubes powerful projectors. Besides the usual video-formed 'vertical frame', 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 regular video, SD or HD, it remains to choose between 4:3 and 16:9. Usually, in such cases recommend 4:3 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. First of all, if even the width of the formats, the size of individual pixel SD increase of 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 easily takes any intermediate position, you will still have to lift the optical axis of the projector in HD-mode. Seems more sensible solution: select the format of the screen basic format of the projector.
The very same format is well 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 principal is a television format. Approx. Auth. Projection screen size is usually chosen so that its width is not more than half the distance from the screen to the viewer. If the source appears as a standard of quality is fears that the pixels are the image will be too noticeable, you can use the 'rule of three diagonal' – diagonal screen size should be three times smaller than the distance from the screen to the audience. Matt and gloss What type of coverage you 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 is lit evenly. These screens are simpler, cheaper and more universal. Glossy screens are mirrored and reflected back (reflective). The first act like an ordinary mirror: the angle of incidence equals the angle of its reflection. The projector is located near the ceiling, and image reflected in the screen down to the audience. Reflective coating comprises a reflective microspheres. The reflected beam returns to the same point, where he was sent to the screen – the projector is on the shelf in front of audience. Both types of coatings tend to reduce the angles of view and increase the comfort of uneven screen illumination. Instead we get a more vivid and sharp image, but is what they say about the coefficient light amplification shield.