Samsung UA40JU6400 E-Manual page 198

Requirements for Using Motion Recognition
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Be sure to use Motion Control within recommended distances:
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TV Camera (Sold Separately): between 1.5m and 3.5m
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The actual recognition range may differ with the camera angle and other factors.
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For the camera to recognise movement, you must stand out from the background.
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The appropriate ambient brightness is 50 to 500 lux. (100 Lux: Bathroom, 400 Lux: Living Room)
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Avoid direct sunlight when using Motion Control.
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Run the Motion Control Environment Test
Motion Control.
to assess the camera's recognition range before using