General information about the screens

What is a screen gain ?
The screen gain is defined as the ratio of luminance produced by a projector’s beam of white, falling 360 degrees on to the screen surface, compared with the luminance of reference standard with gain of 1.0 Reflectance (gain 1.0) is measured on a tile of white carbon black. Simply, the gain of white carbon paper is 1 and gain of mirror is 100. Generally, if the gain of the screen gets doubled, the price gets increased 2-4 times.

3D stereoscopic effect
3D stereoscopic effect by the left and right viewing angle difference cannot be expressed on the flat screens. Screen Technics Screen (Lens-type concaved screen) or cylindrical (curved-type) screens are usually used in various types of simulators in order to achieve the vivid stereoscopic image.

Flatness of screen
The screen’s surface has to be flat in order to achieve the uniformity of the brightness and the resolution. After using a roll-up screen for years, the screen’s surface will not have the same flatness and look like it gets curling. 80% of customers in the world use a fixed type screen. The shape and the quality of the screen will not change because surface of Screen Technics screen is made of high quality German Fabric.

Seam of the screens
Generally, the screens with size above 100’’ have visible seam lines. It is important to check the thickness and the negative effect of the seams on the image.

The resolution of the screens
Rough surface of the screen cannot express high resolution even with the HD projector. The particles of screen’s surface are required to be under 20 micron for bigger than 100’’ for HD display.

Viewing angles of the screen
Generally, the half-gain angle of the screens is defined as 50% value off the brightness of the image received in the center of the screen at zero degree viewing angle. However, It should be applied for normal screens. Specially designed Screen Technics screen with German Fabric is very different from normal screens. Viewing area of a Screen Technics screen has to be considered by the width of the screen and maximum viewing distance.

ANSI Lumen of projector
ANSI lumen is a measurement of the overall brightness of a projector. Because the center of the projected image is brighter than the corners, ANSI lumen is calculated by dividing a square meter image into 9 equal rectangles, measuring Lux (or brightness), reading at the center of each rectangle, and averaging these
nine points. ANSI lumen is in general more accurate measurement of the image brightness than other measurement techniques.

The brightness on the larger screen will decrease proportionally
The brightness of the screen can not be resolved by the brighter projector only. Please contact Satguru for get more information to get the vivid, bright image. (sagar@satguruinfocom.com) General information about the screens.