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I'm no expert, but multiview and Dual play are different things. I expect you could do a side by side or top and bottom multiview display of two images, but your game machines will output full images that you either have to squash or stretch, maintain the aspect ratio with black space around or make the image with half the height or width. As remarked above, you will likely get distortion or loss of resolution. 4 images on a really big screen might work...
Regarding Dual play, LG offers passive 3D displays*. The two images are interlaced, with each line on the screen polarized differently to the next. The polarization matches that of the two lens filters, so each eye sees a slightly different image for a 3D effect. With 'Dual play' the two images are different 2D points of view and each player (having both lenses the same) only sees their own viewpoint. Multiple images tessellated on one screen won't work with this.
My assumption is that a display takes a single input signal and displays it according to a timer. Attempting to use two unsynchronised inputs would likely mess up the system with interference and anyway, how do you persuade the TV to display 2 inputs at once in the same image area? A 3D signal contains two synced images as does a dual play one. It's perfectly possible to sync two sources, but this requires extra circuitry that would add expense to a display intended only to display a pre-formatted input.
It might be possible to synchronise the timing with an old genlock box, but you still need the TV to rapidly switch between the two inputs and / or interlace them - it's still expecting a single input source. So you need another box to to format them as a 3D signal the TV can recognise and deliver that to a single input. My assumption is that with Dual play on a console, it is either a hardware graphics mode or a software thing where perhaps the graphics HW is split to create two images and also combined to the single output. (Presumably, a game could use the same mode to offer a 3D view in a single player game). The point is that the game is combining the images at source, not the TV.
I'm afraid none of this solves your problem as I'm guessing Dual play is a game feature that preformats a signal for a single input. I'm not actually clear how this is different from a 3D signal - it's just different glasses. Maybe something is done with image processing or sound..? As above, technically you could buy various boxes to take two inputs and convert them to a 3D or dual play output if your games don't offer the dual play option.
I revisited this thread because I saw this: MirraViz lets two gamers see different perspectives on the same screen - The Verge
$2000-3000 and you don't even need a TV! Problem solved?
* The other system is 'active' which shows alternate full images at higher frame rates and powered glasses with LCD shutters in sync to show every other image to one eye only.
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