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Author Topic: Picture quality: projectors vs. TVs Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 04-17-2018 07:54 PM                     quote: Mike Blakesley One big drawback of digital cinema is contrast. Part of the problem is, you're projecting white light on a white screen, yet still expecting parts of the picture to look black. Yea, that's light scatter. Also DLP can not do true black because of the limited range the mirrors can move. Mark  |  IP: Logged Peter Castle Expert Film Handler Posts: 220 From: Wollongong University, NSW ,Australia Registered: Oct 2003 posted 04-18-2018 01:03 AM                     I always thought that DLP worked on a frequency basis. Each mirror can point in one of two directions - towards the screen (eventually) or to a dead end. If over the period (say 1/24 of a second)the mirror reflected to the dead end, you got black. So the brightness depended on the proportion of the time light was transmitted. So what's the problem in getting black?  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 04-26-2018 06:55 AM                     Among other issues, that the 'dead end' is not a real 'dead end', but just halfway dead. - Carsten  |  IP: Logged Marcel Birgelen Film God Posts: 3357 From: Maastricht, Limburg, Netherlands Registered: Feb 2012 posted 04-26-2018 07:40 AM                     quote: Peter Castle Each mirror can point in one of two directions - towards the screen (eventually) or to a dead end. If over the period (say 1/24 of a second)the mirror reflected to the dead end, you got black. So the brightness depended on the proportion of the time light was transmitted. So what's the problem in getting black? Most of the light not hitting the screen is hitting a heat sink. This heat sink is originally powder-coated in a dark paint, but after a while, the paint starts to burn off. It's a nice indication of just how much light you try to contain. So, like Carsten already mentioned, the "dead end" isn't really the Dead End, some of the light will reflect back. The same goes for the light that falls between the individual mirrors for example. Also, the light coming from the light source is never perfectly directional, it will contain light that will hit the equipment in the light engine at an odd angle and eventually leak out through the lens and hit the screen.  |  IP: Logged

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