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The 3D technology also has disadvantages, as our measurements clearly highlighted: The brightness and the colours suffer, but the contrast and motion clarity barely change. Whereas in normal 2D operation the TV produces a luminance of about 300 candelas per square metre (cd/m2), this value drops to just 45 cd/m2 in 3D mode. This is too low for day-lit rooms, but gives a sufficiently vivid picture in dark rooms.
http://www.televisions.com/tvs/samsung-televisions/samsung-lcd-tvs/Samsung-UE-46-C-7000.phpSo, you might be wondering, where is all the brightness going? We tracked down two causes: first, the glasses themselves; secondly — and more importantly — the way the panel is driven.
Besides purely measuring the flow of light through the glasses, we used a light-to-voltage converter and an oscilloscope to measure how long white is transmitted to one eye while the other eye is set to black. The result: In a period of 50 milliseconds, three white pulses came though one side of the glasses; this corresponds to 60 hertz. In theory, therefore, a white pulse would last 8.33 milliseconds for each eye. In practice, however, the panel only shines for 3.7 milliseconds of this. Combined with the relatively long reaction time to display white, therefore, this explains the pronounced brightness reduction.
Still, the results are better than on PC monitors with Nvidia shutter glasses. These glasses additionally reduce the length of the white pulse, leaving less than 10 percent of the brightness remaining.