How gray are gray screens? - AVS Forum
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post #1 of 1 Old 02-14-2013, 05:40 PM - Thread Starter
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So I did my reading about gray vs. white screens, how they (don't) affect contrast ratio, and the trade-off between gain and viewing angle.

1. Here are some assumptions, tell me how accurate they are:
  • The brightness of a screen can be broken down into the amount of black pigment used, and its sheen.
  • The pigment determines "total reflectance" - how much ambient light is reflected, and how gray the screen looks on casual examination.
  • The sheen concentrates frontal light into a narrower viewing angle. "Geometric gain" is the important spec here.
  • The typical marketing-speak "gain" is a combination of the above two.


2. So, what if I want the deepest black levels (and ignore white levels for now) - how do I pick that?

3. How about this formula? Total reflectance = gain / (180°/viewing angle)
No exact units, but should help compare black levels within the product line of one manufacturer?

4. Viewing angle: when a manufacturer writes that the viewing angle is e.g. 50°, is it half-gain at 50°?

5. Does Da-Lite have spec sheets with total reflectance as well as reflectance graphs so I can see the different gain levels at various angles?
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