NEC NP-V260 User Manual page 85

NOTE:
This function will not work for VIDEO or S-VIDEO source.
This option is available only when [DLP® Link] is selected for [GLASSES].
[L/R INVERT]
Change the setting if you have difficulty seeing 3D images.
NON-INVERT ......................Normal setting.
INVERT ...............................Changes the order of displaying the images for left eye and right eye.
NOTE:
This option is available only when [DLP® Link] is selected for [GLASSES].
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5. Using On-Screen Menu