| Projectors that achieve high contrast ratios usually use some kind of MEMs technology (like TI's Digital Light Processing) AFAIK. No, you can't simply stack the LCDs, because each LCD typically has a diffuser for the light source and the LCD drive electronics mounted BEHIND the LCD. Attempting to separate these components in order to shine light THROUGH the LCD (which is what you are talking about doing) would result in destruction of the LCD panel.
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