Thanks for the prompt reply. I want one of these: http://www.wiredathomeblog.com/blog/laser_dlp/index.html
(Texas Instruments DLP arrays switch in 2uS and the mirrors are still larger than optical wavelengths.) A related question: As the micromirrors shrink to sizes below the wavelength of visible light, we must now do some signal processing to create what is really a hologram rather than just a pixel map. Is that kind of processing done now? Is it feasible in the future? The semiconductor industry already creates "phase masks" that account for the wave properties of light at around 32 nm, so the projected image on the silicon is the precise layout they want, but I guess that takes quite a bit of computer power, not feasible in real time. -----Original Message----- From: Mike Carrell [mailto:[EMAIL PROTECTED] Sent: Saturday, January 06, 2007 7:44 PM To: [email protected] Subject: [Vo]: Re: Optics question The answer is almost certainly no. Decades ago,while at the Sarnoff laboratories of RCA, TI had a study of their DLP optics going, one of several. Because of the small deflection angle of the mirrors, it was very, very tricky to effectively focus the light from the source on the mirror array, without losing a lot of the light. RCA's results were not accepted in the end; I don't know how it is done now in the commercial units. 'Recycling' the dumped light is apt to be very tricky indeed. It is wasteful, and the lifetime of the HID lamps is limited and its replacement is expensive -- so there is an appreciable expense in operating a DLP TV. The intensity of each pixel is controlled by the duty cycle of its mirror, which has to switch very fast indeed between on and off. Laser illumination would solve some problems and might be used for DLP theater projection, which is gaining momentum. Using three DLP arrays might be advantageous there also, avoiding the use of a color wheel. Mike Carrell > > > In a digital light processing (DLP) display, a light source (soon to be a > tri color laser) projects on an array of movable mirrors. The light for > the > dark parts of the image are sent to a beam dump. That seems wasteful. Is > it possible to collect that light and re-introduce it into the primary > source? > > Hoyt Stearns > Scottsdale, Arizona US > http://HoytStearns.com > > > ________________________________________________________________________ > This Email has been scanned for all viruses by Medford Leas I.T. > Department. >
