Interference of light on the projection screen quality

 Degree of interference with the interference of light can be calculated as:

more sources of light interference , mainly from the screening venues and projectors.


one screen showing images of the effects of light interference analysis

1, the interference of light from the screening venues

(1) exit the audience hall, the toilet door is not too bright security lighting light colored glass or colored glass add the color is too light, are on the screen caused by interference of light.

(6) open-air show, the screen facing the moon, and other lighting street light to the screen surface, resulting in interference of light.

interference of light on the projection screen quality

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(3) of reflection of light around the screen to form the interference effect of light. For example: the walls around the screen (especially the back wall), ceiling, stage flooring, light curtain, are able to re-screen reflects the light reflected back to the interference screen.

(2) auditorium doors and windows, side walls block air vents above the exhaust fan lax, is the most harmful interference caused by light.

(1) projection lens. First, the lens surface oil, fingerprints, black paint off the lens barrel caused by reflective surfaces, and then the lens itself has a quality defects, such as spherical aberration, astigmatism, color, etc., for these reasons will cause interference light.

(2) projector film gate near the surface of the metal finish, black cooking process without treatment, can produce a little reflective dot to form a strong interference of light.

(4) the audience hall of smoke and dust in the air too much, causing chaos to the show reflected light conditions, interfere with the formation of diffuse light.

Second, the interference of light source

(3) together into a mirror focus, spot too, after the door after the film, not all projected onto the lens, through the lens projected onto the outer edge of the screen, interfere with light.

(4) showing the window glass and the show is not perpendicular to the optical axis, or the inferior quality of glass formed by interference of light.

[1] [2] Next

Some town cinema, especially the drama and let the movie theater, for various reasons, there is interference with the screen light does not meet the screening requirements of technical regulations, seriously affect the screening of picture quality. To improve the quality of projection screen, made for the implementation of the national rural

2. From the interference of the projector light

(5) show the light through the screening room and viewing fenestrae formation of interference of light hitting the screen. One is the work lights, one is the projection booth with a window during the day when the sun shone show formation.

make the show full screen landscape looks level, image clarity, we must attach importance to reduce the interference of light exposure on the projection screen. Images on the screen is light through the lens and the film frame onto a screen formed. If you have nothing to with the screen light evenly onto a screen, the image is darker part of the lighting, which destroyed the screen image brightness, so that the screen's anti-significantly smaller image gray, clear, see it is very difficult, highly visual fatigue. For example, in the case of no interference of light, do not install video, full screen film gate 30 nits brightness. Equipped with video, showing the brightest part of the screen is 15 nits of brightness, the brightness of the darkest part of the 0.3 nits. The brightest and darkest parts of the brightness ratio of 15:0.3 = 50:1. If the above conditions, 2% screen interference of light, that is 30 �� 2% = 0.6 nits of interference light, the brightness of the brightest part of the 15 +0.6 = 15.6 Bennett, the brightness of the darkest part of the 0.3 +0.6 = 0.9 nits. 15.6:0.9 ratio of brightness between the two = 17:1, apparently, the ratio of light and dark part of the brightness decreased by about two-thirds. If the interference of light is stronger, that the brightness of light and dark part of the decline in the ratio the more the less clear images. According to GB5880 - 86 national standard: every game cleared the cinema, the degree of its interference with the interference of light is 2%, not numbers, free admission to the screening venues, and its interference with the interference of light is 3%. It should seek to minimize the interference of light, controlled by the state's standard range.

addition to the formation of the screen image of the light, but shine the light on the screen of the other (external stray light and stray light show) call screen interference light. Interference of light on the screen showing the impact of the screen, mainly to reduce the contrast of the screen showing. Human visual resolution images on the screen, depending on the contrast between light and shade various parts of the screen, the greater the contrast of the image more clear. If the main part of the screen and the background contrast between the small image to see it is very difficult. With the interference of light movie screen, color screen infiltration into white light white, as if covered with a layer of haze and reduce the color brightness. Black and white black and white contrast levels dropped, turned out to be black into a dark gray, if serious interference of light, the image just a little hint of the shadow, or even obscure, all artistic effects have been destroyed.