It's already being done in an undocumented way on cheap DLPs
RLBURNSIDE wrote:There is no chance of low-persistence / BFI on projectors (unless you can do 120hz and BFI manually)
The fact is that other DLP's do it already....
My question is simply for LG ProBeam: Can it do 1080p 120Hz?
Yes, brightness goes down, but only by roughly half (Approximately 4ms strobe length, 50%:50% BFI, 120Hz), depending on projector.Existing Precedent for 120Hz BFI on cheap DLPs
I've been able to do it successfully.http://www.blurbusters.com/gigantic-120 ... projector/http://www.blurbusters.com/benq-w7000-d ... z-at-720p/
120Hz is common on many DLPs because of 3D mode.Requirements for Undocumented Projector 120Hz 2D Support & Undocumented BFI
1. DLP projector supports frame-sequential 3D mode (not checkerboard, not side-by-side)
2. And it supports 120Hz in 3D mode (60fps:60fps frame sequential 3D), at least at 720p resolution.Technique
1. Force 120Hz into the projector, using techniques similar to: True 120Hz from PC to TV
2. THEN enable 3D mode in the projector menus, while continuing to use 2D. (Don't wear the glasses)This enables BFI, used for glasses shutter delay (LightBoost's raison d'etre) but they lower persistence even for 2D use.Result
-- DLP projector is using BFI and 120Hz (in an undocumented way). Caveat: Even for some 1080p projectors, this may only work during 720p mode. Newer projectors may be able to do 1080p@120Hz
It worked on the Optima GT720 and BENQ W7000 series DLP projectors, although only in 720p. Those a cheap sub-$1000 DLPs. Yes, it reduces brightness, but not unusably so. Resulting picture is still brighter than old 100-pound CRT projectors.