I really do expect to see moderately priced DLP 1080p 3D projectors available toward the end of 2010. In the case of DLP the additional cost to add 3D capability is quit modest (basically just upgrading the HDMI and video processing chips plus adding a IR emitter to sync. the shutter glasses and perhaps a higher wattage lamp). Today's mid-level 1080p DLP projectors with a street price in the range of $2.5K might evolve into 3D models with street prices in the $3K range, but some manufacturers may decide to first offer 3D only in their highest-end model(s). As for LCD projectors this year, there certainly could be models offered using dual light engines (but they would be expensive) using existing LCD display chips, but single light engine models that can actually project 3D without right/left crosstalk may still be a year or more away. You do need to remember to using alternating right/left images in combination with shutter glasses reduces the viewed image brightness by 70% to 85% and depending on the screen size and screen gain a much higher wattage bulb may be necessary to keep image brightness to an acceptable level for 3D viewing. For example my Epson 6500UB is considered a fairly bright HT projector, but once calibrated I find it doesn't have very many lumens to spare when projecting onto a 120" 16x9 screen with a gain of 1.1. Such a projector with its current light engine lumens would probably only provide adequate brightness for 3D viewing if used with a screen of less than 80" (and perhaps 60") or substantially higher gain. I suspect many future moderate priced 3D projectors may attempt to support 3D by essentially running the projector in a vivid or dynamic mode where then can produce higher lumens, but not achieve good color accuracy.
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