Have there been any hobbyist / open designs using the TI DLP? Is the device available in low quantities? I don't find any in the standard distributors or by part number on the web except at the mfgrs and some other non-sales sites. My interest is mostly for low cost Head mounted HUD or Private Eye type application so the issues are A) power consumption... anything with a motor in it is probably not a good solution B) vibrations... anything with a motor in it... C) weight.... anything with a motor in it... Although I've thought about a mavlev'd mirror rotor in a vacuume tube... When I saw the DLP I about creamed my jeans but nothing has reached the little guy that I can find. --- James Newton (PICList Admin #3) mailto:jamesnewton@piclist.com 1-619-652-0593 PIC/PICList FAQ: http://www.piclist.com or .org -----Original Message----- From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Robert Rolf Sent: Tuesday, July 03, 2001 11:00 To: PICLIST@MITVMA.MIT.EDU Subject: Re: [EE]: Displays Mechanical scanning has been around since the very beginning of television. However your horizontal scan mirror would not work with 525 faces since you'd only be in the beam for 360degrees/525 =0.68 degressx2, which is a pretty darned narrow image. Such a system would typically have a polygon mirror with 16 sides, giving a 45D scan angle, and use a galvanometer for the vertical scan (since 120Hz is relatively easy to achieve). Since rotating at 60,000RPM is a bit of a challenge (15734Hz/16), the beam is split into several, which are independently modulated such that you get several lines scanned at once. Essentially the picture gets show 4 or 8 lines at once. Today they would use AOM/AOD (acustoptical modulators/deflector) so there are no moving parts, but the efficiencies of lasers are sooooo poor that AFAIK there is no commercial system using them now. Everyone has moved to DLP (Digital Light Processor, Texas Instuments memory device which uses tiny mirrors deflected by the charge stored in a RAM cell [grossly simplified explanation]) when high brightness is required or LCD's when you're not trying to fill a stadium. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.