Экраны обратной проекции

Gain is the reflection index of a screen.
In the case of Экраны обратной проекции it does not indicate reflection, but the flux of rear-projected light which is visible on the front side, it is also called transmittance.
It indicates the ratio between the light reflected from the screen and that reflected by a standard white surface used as a reference parameter:
a screen with 1.0 gain will reflect the same amount of light, while a screen with 1.5 gain will reflect 50% more light, and a screen with a 0.8 index will reflect 80% of the light.

The gain is measured in the point where the screen is at its brightest, that is watching it from a frontal and perpendicular position.
Moving to the side and watching the screen from an angled position, the brightness of the projection decreases.

''Is high screen gain good?
It is easy, and wrong, to jump to the conclusion that a high gain screen must be preferable to a low gain screen.''

First of all, there is a compromise between gain and viewing angle.
In high-gain screens, the brightness of the projection decreases considerably with the increase of the viewing angle, while in low-gain screens the brightness varies much less perceptibly.

Furthermore, a high-gain screen does not generally reflect evenly red, green and blue and the anomaly varies with the viewing angle.

Lastly, screens with a gain higher than 1.0 have a certain degree of hotspotting which is accentuated with the increase of the gain.
Than means, that looking the screen from a frontal position, the central part of the image appears brighter than in the peripheral areas.
This is not very visible up to a gain of 1.3, but, beyond that limit, hotspotting can seriously disturb vision.

''[ ... ] the videophile looking for the optimum image quality [ ... ] will usually want to opt for a low gain screen.''

Source: Evan Powell, in ProjectorCentral.com

его величина характеризует развернутый угол, в пределах которого яркость экрана падает не более, чем на 50%

для экранов обратной проекции очень важно, чтобы шов был как можно менее заметен; поэтому мы используем высокочастотную сварку полотен встык без нахлеста (Сварки встык), которая позволяет получить шов менее 1 мм толщиной; такой шов на экране обратной проекции незаметен невооруженным глазом уже с расстояния 5 / 6 м

любой формы и без ограничений по размерам

Европейский сертификат EN 13501·1, российский сертификат

Материалы для рир-проекции
Типы отделки изделий из ПВХ
Бэклит-фоны
Бэклит-задники с цифровой печатью

с YPT - Очиститель для виниловых материалов
см. Уход за ПВХ задниками