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Natural Science Forum / Physics / Optics / October 2004LCD Projector
In the latest issue of Wired Magazine Hitachi has a cutaway view of the optics of a liquid crystal projector. Everybody take a look, it's cool. This is interesting to me because I designed the first LCD projectors around 1978 when my colleagues at Hughes Aircraft invented the LCD video display. Of course I can pick out little things in the design that I thought of many years ago, and the projector is interesting because it has what looks like a 7 element field lens. But any optical designer should have fun looking at this. It includes a folding mirror in the middle of a projection lens, which we used to think about. The combiner is covered up, possibly by the third color channel. Anybody know what they mean by "Dual Focus?" . Best regards mark  Signature---------------------------------------------------------------------- Mark W. Lund, PhD ** Battery Chargers CEO ** Bulk Cells and Custom Battery Packs PowerStream Technology ** Custom Power Supplies 140 S. Mountainway Drive ** DC/DC Converters Orem Utah 84058 ** Custom UPS http://www.PowerStream.com ** Engineering, manufacturing, consulting > In the latest issue of Wired Magazine Hitachi has a cutaway view > of the optics of a liquid crystal projector. Everybody take a look, > it's cool. Is this article available on-line? I did a quick search of the Wired site but did not come up with anything :( > This is interesting to me because I designed the first LCD projectors > around 1978 when my colleagues at Hughes Aircraft invented the LCD [quoted text clipped - 12 lines] > Best regards > mark Signature+==================== L. Michael Roberts ======================+ This represents my personal opinion and NOT Company policy Goderich, Ont, Canada. To reply, post a request for my valid E-mail "Life is a sexually transmitted, terminal, condition" +================================================================+ > > In the latest issue of Wired Magazine Hitachi has a cutaway view > > of the optics of a liquid crystal projector. Everybody take a look, > > it's cool. > > Is this article available on-line? I did a quick search of the Wired > site but did not come up with anything :( > > But any optical designer should have fun looking at > > this. It includes a folding mirror in the middle of a projection > > lens, which we used to think about. The combiner is covered up, > > possibly by the third color channel. > > > > Anybody know what they mean by "Dual Focus?" Michael & Mark: I googled for this Hitachi light engine photo because I have seen it recently too, but could not find a photo of it. I found a hard copy photo in my Sept 2004 Sound & Vision Magazine on and insert pg 32. Hitachi is spending some good bucks on print advertising but dosent have this nice photo on their web anywhere easy to find, too bad. The back end from the light source to the x-cube combiner looks like a standard LCD light engine. I think the dual focus might refer to the projection lens assembly. It appears that there might be an intermediate image at the fold mirror so: one image at the fold mirror and one at the rear screen. If this is the case then the bulges or humps in this lens design might be for distortion like in microlitho lenses with bulges. I read the text very carefully a couple of times on their press release and the by the sound and vision photos about the dual focus technology and it is not clear where the innovation is at, one could be lead to believe that the dual focus is in the RPTV screen (but then why show a photo of the light engine) - just not sure. I you want to take a look at some conventional light engines for DLP, LCD, and LCoS spatial light modulators you can find them on my website in three consecutive enewsletters at: http://www.oscintl.com/enewsletter.htm Michael Pate www.oscintl.com It is possible that "focus" is MBA speak. Focus one is on the customer, focus two is on sales, thus "dual focus." >>>In the latest issue of Wired Magazine Hitachi has a cutaway view >>>of the optics of a liquid crystal projector. Everybody take a look, [quoted text clipped - 39 lines] > Michael Pate > www.oscintl.com Signature---------------------------------------------------------------------- Mark W. Lund, PhD ** Battery Chargers CEO ** Bulk Cells and Custom Battery Packs PowerStream Technology ** Custom Power Supplies 140 S. Mountainway Drive ** DC/DC Converters Orem Utah 84058 ** Custom UPS http://www.PowerStream.com ** Engineering, manufacturing, consulting > It is possible that "focus" is MBA speak. Focus one is > on the customer, focus two is on sales, thus "dual focus." [quoted text clipped - 42 lines] >> Michael Pate >> www.oscintl.com Dual focus sounds like the Talbot self-imaging effect...most MBAs have no problems with self-image.... Cheers, Phil Hobbs |
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