【 Weak current College 】 cinema-the right choice of projector screen

Install the appropriate type of screen to film shows significant impact experienced and for cinema operators to save money.

Screen for film shows experience produces several implications-the most important thing is the quality of the movie screen: brightness, contrast and color reduction and potential defects of the silver screen distracted. Screen the screen rear speaker system for acoustic performance, especially high-frequency loss affect the brightness level of screen to ideally through references worldwide accepted standard SMPTE. The standard provides that, when viewed from a central location, the altar brightness to achieve 16-foot Lambert (55 candles per square centimeter) square minimum brightness of screen 12-foot Lambert.

The audience can see the screen brightness depends on several factors: show lamp light lights from the mirror, show through the lens and show the window to the screen between optical loss and reflection from the screen to light. Modern cinema projectors use Xenon lamp (relative to the legacy of carbon lamp technology) has a different power, according to screen size of different sizes, the most number of multiplex 2.0 Xenon lamp power kW to 7.0 kW, higher light output light power, but the higher the cost of the Xenon lamp power.

The screen is the optical brightness reflected back to the audience. White plastic curtain makes light scattering, and most of the light reflection to the ceiling and the side wall was lost. Referred to as the "gain" screen will be more light directly back to the audience. Screen gain level and the amount of light reflected back, its measurement in accordance with the reference standards (with light reflectance value 1 carbonation magnesium Board). Commercial white plastic curtain of reflectivity varied, but generally have under reference standard 0.8-1.0 reflectivity. "Gain" screen can have 2 or more gain levels, but for the theater's screen is the size of the screen under yingting usually best 1.4-1.8. More than 11 metres wide screen with a gain of the screen will normally have receipts screen width exceeding 14 m when it is better to use high-gain (1.8) screen. Gain more than 1.8 high gain screen produces "hotspots" (that is, the screen Center looks too bright).

Now some theater are using digital show as a 35 mm slide show options. Latest digital projector can output up to 17000 lumens of brightness. The figures show the light output is likely to reach traditional projector brightness, so the screen width is greater than 10 meters with an income gain of the screen.

White plastic curtain is usually installed on the flat screen so that however of light reflection and yingting parts the best viewing angle, gain screen the best installation in curved screen. Because of the white plastic curtain makes light scattering, if using curved curtain frame will have a contrast ratio of losses is therefore not recommended. Gain screen of ARC ARC depends on many factors, but usually 20: 1 ratio of chord height.