Ask the Expert: HD Upside Down

Q. I'm interested in buying a front projector for ceiling mounting. I realize that when projectors are turned upside down for a ceiling mount, a circuit inverts the image so you don't have to watch the movie standing on your head. I also realize that there's another circuit to reverse the image left-to-right for rear-projection. Is this standard on all projectors, and if not, how do I know if a projector can perform these feats before buying? Also, since almost all circuitry applied to a signal can be detrimental, does Sound & Vision test the quality of this circuitry? Frederick Hart Orlando, FL

A: SEAN GREER, Owner, Experience AV Home Theater, Montrose, CO, says: To the best of my knowledge, there's no digital projector made at this time that doesn't have a facility for selecting ceiling or rear projection. As for the question of image quality, it's a good one, given all the processing and scaling that goes on with video signals these days. S&V editors tell me they don't usually check this function, but fortunately, with a digital projector, there's really no need to "process" the image (in the traditional sense of that word) to change the display orientation. It's really a matter of just rerouting the correct bit of data to the correct point on the screen for the desired orientation. No scaling or alteration of the signal is performed, just a relocation of where the data comes out on the pixel grid of the projector's microdisplay chip, whether it's DLP, LCD, or LCoS.

Read last month's Ask The Expert Back to Homepage What's New on S&V

Share | |

Enter your Sound & Vision username.
Enter the password that accompanies your username.
setting var node_statistics_109196