3D Vision Blog

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All 3D Glasses Block a Bit of the Light, but How Much Exactly

January 20th, 2010 · 9 Comments · Other S3D Tech

glasses-lux-meter


Everyone is talking about their 3D glasses not blocking as much light as the competitors or not stopping any light at all etc., but does anyone know how much light gets actually blocked when you wear a certain type of 3D glasses? I did a little quick and dirty test to check just that by placing a light meter at a distance of 20 inch (about 51 centimeters) away from display in a completely dark room with no other light sources. Then on the display (120Hz ViewSonic VX2268WM) was shown a completely white image (jps) displayed on the whole screen and I’ve taken out measurements of the light reaching to the sensor of the light meter directly and through a few different types of glasses. The light was measured in Lux units as this way I could measure the intensity of light that reaches your eye without any glasses and when wearing a certain type of 3D glasses based on different technologies…

And here are the results:
– 22″ ViewSonic white, no glasses – 47.2 lux
– 3D Vision active shutter glasses – 41.3 lux (shutters constantly open)
– 3D Vision active shutter glasses – 5.9 lux (per eye with switching shutters)
– Passive circular polarized glasses – 32.1 lux (the glasses from Acer Aspire 3D)
– Anaglyph anachrome red-cyan glasses – 21.9 lux (for red), 22.3 lux (for cyan)
– And a with pair of plain black sunglasses – 15.4 lux

And a little update with more:
– Plain paper anaglyph glasses red-cyan – 7.4 lux (red), 21.3 lux (cyan)
– 3D Vision Discover (anaglyp red-cyan) – 6.3 lux (red), 17.8 lux (cyan)
– Pulfrich paper glasses (clear-black) – 3.5 lux (black lens)

As you can see there is a significant difference in terms of the amount of light that reaches the eye of a person when using different kind of glasses for viewing 3D content with 3D Vision getting the least amount of light passing through. This is normal because of the switch on/off cycle of the shutters in these type of glasses, this however dos not mean that the technology is bad or something like that… it means that just like with other tech you need to compensate with more brightness of the image coming from the screen. But with a passive polarized glasses like the ones from the Acer Aspire 3D you can get more light to the eyes of the user and this is quite important as usually the screens of the laptops are offering less brightness than their desktop counterparts. The comparison with the plain sunglasses is also important, so that you can get a general idea on how things look through the different types of 3D glasses by just taking a look over through your sunglasses and taking into consideration the numbers above. Another thing to note is the difference between the light passing through both color filters on a normal pair or paper anaglyph glasses compared to plastic anachrome glasses (the later have better color reproduction).

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