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For one eye, the first pass presents the odd lines of the 1080p image onto the odd line rows of the screen, followed by the even lines, which are also-and unusually-presented on the screen’s odd line rows (not on the even line rows). So how can LG claim 1080p resolution when each eye is forever blocked from seeing half the lines? For each single frame of incoming video, LG refreshes the image to each eye two times. The matching polarization in the glasses then steers the odd lines to one eye and the even lines to the other eye, which means each eye only sees half the 1080-line vertical resolution (1920x540). In 3D mode, these passive TVs essentially divide the display screen-and thus the 3D stereo image-into odd and even lines, each group having a different polarization. That claim goes against our general understanding of the current passive polarization techniques, which typically cut vertical resolution in half. In particular, we wanted to check one of LG’s most unusual claims: That unlike the Vizio set, LG’s passive 3D TVs were capable of displaying true 1080p (1920x1080) resolution to each eye. Both companies’ passive 3D TVs employ a polarizing filter on the TV, enabling viewers to wear lightweight, inexpensive passive 3D glasses rather than the pricier, bulkier active-shutter eyewear required by so-called active 3D sets.
![lg passive 3d settings lg passive 3d settings](https://regmedia.co.uk/2012/02/08/lg_dm2350d_3d_monitor_and_tv_combo_1.jpg)
![lg passive 3d settings lg passive 3d settings](https://images.crutchfieldonline.com/ImageHandler/trim/750/457/products/2013/25/689/g68960L7400-F.jpg)
Ever since we heard that all of LG’s 3D LCD TVs would use “passive” 3D technology, we’ve wanted to get one in the labs and see how it compared to the only other passive 3D set we’ve tested so far, Vizio’s 65XVT3D Theater 3D model.