Black screen works in daylight

[SuperZoboo]

Im just copying news from another site here, but Sony has evidently created a black screen that reflects only the white ambient light, while red-green-blue are still reflected back.

This means a great picture in the middle of the day with the windows open, lights on!

How soon can the DIY community reverse-engineer this screen and can it work with our already built DIY projectors?

Here is the link:

Sony Creates Black Projector Screen

[dengez]

that sounds good!

prof from the msn groups... http://groups.msn.com/ditprojectiontv
has created the "ULTIMATE HIGH GAIN SCREEN" his only light source is his tv(he has a 100" tv scam with a good lens..hehe)and he can watch it with excess lights on ! it rejects ambient light terrificly...you may want to look on the site to pics and a downloadable pdf file on how to make the screen...


dengez

[Jestre]

http://groups.msn.com/diyprojectiontv

fixed link

[mindless_fool]

link does not work..at least not for me

[Evidence]

best news ive heard in awhile

[ancorp]

Sony's Black Screens
May Brighten Business

By EVAN RAMSTAD
Staff Reporter of THE WALL STREET JOURNAL
June 17, 2004; Page B10

In TV technology, everything is changing fast. Fat tubes are being replaced by flat screens, square screens by movie-style rectangles and standard pictures by high definition.

And now, white projection screens are being challenged by dark ones.

In apparent defiance of color theory -- that dark surfaces absorb light and white surfaces reflect it -- Sony Corp. has unveiled a black screen that allows a regular digital projector to vividly display TV images and business presentations in a brightly lit room. It continues a trend that began two years ago when Stewart Filmscreen Corp., a leading U.S. maker of screens, began selling a light-gray screen that enhanced the images from projectors using digital chips.

Tokyo-based Sony showed a 160-inch-diagonal version of the screen last week at the Infocomm trade show in Atlanta, after showing 80- and 100-inch versions in a living-room mockup at an industry conference in Seattle three weeks ago. At both events, it made a splash.

"No other technology attracted so many people to stand around and look at it and say 'Wow,' " Richard Doherty of Seaford, N.Y., consultants Envisioneering Group, says of the Seattle demonstration.

Sony hasn't decided when to begin selling the screen, how to price it, where to sell it first or whether to let other manufacturers use the technology. Sony has both commercial and consumer versions of the screen in the works.

<SPACER type="block" width="8" height="1"> NOW YOU SEE IT




See Sony's new technology for projection-TV screens that allows for a more vivid picture in well-lit environments. Adobe Acrobat Required.
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<SPACER type="block" width="252" height="12">
"It is an elegant solution to an irritating problem, which is the need to have a dark room for projectors," says Jean-Pierre Guillou, an engineer at Sony's display-research lab in San Diego, who was involved in the screen's development.

Sony engineers worked from the basic principle that projectors, like all TVs and monitors, form colors by blending three primary hues: red, green and blue. They came up with a filter that allows the screen to reflect only red, green and blue light. The other light in a room, such as white incandescent or fluorescent bulbs, isn't reflected.

In a bright room, the image on the screen is brighter and shows greater contrast than it would on a white screen. There is no difference in a dark room.

The new screen could increase the popularity of video projectors for home use at a time when the TV market is already being shaken up by fast growth in flat-screen liquid-crystal display and plasma models. If it is priced competitively, it could change buying habits, since consumers could get a much bigger image for about the same money.

Sales of projectors for both business and home use are already growing strongly because of the change to digital technology. Microchips have replaced bulky tubes inside projectors in recent years, shrinking the size and weight of the machines. Some weigh less than two pounds and are popular with traveling executives making presentations from laptop computers.

Consumer sales escalated last year when prices for the small projectors fell below $1,000. In the fourth quarter, consumers accounted for 58% of the sales of sub-$1,000 projectors in the U.S., up from 48% in the third quarter, according to a report released this month by market researcher Pacific Media Associates. The company forecasts sales of 3.6 million video projectors world-wide this year, up from 2.5 million last year.

Since Thomas Edison introduced motion-picture projectors more than 100 years ago, movies have been shown on white screens in dark theaters. When projector TVs emerged in the 1970s, optical engineers began working on ideas to maximize the light a screen reflects from a projector and minimize what it reflects from other sources of light in a room. One of the first big-screen projection TVs, developed by U.S. audio-video entrepreneur Henry Kloss, had a parabolic screen to defray ambient light.

Two years ago, Stewart Filmscreen, Torrance, Calif., developed its light-gray screen, GrayHawk, to boost the contrast of digital projectors in home theaters. Several other screen makers followed. Last year, Stewart produced a dark-gray version, FireHawk, that sharply reduces the impact of ambient light. Customer response to the screen "has been overwhelming," says Stewart's Andrew Cox.

The key to the Sony screen's success will be pricing. While basic projector screens for schools and offices are available for as little as $80, those designed for home theaters typically start at around $500 and can rise above $2,000. The retail price of a 100-inch version of Stewart's FireHawk screen is $1,700.

But many consumers won't spend more on a screen than a projector, according to Pacific Media analyst Tom Edwards, who says Sony may try to price its new screen at around $500.

IN MY OPINION, THIS WOULD NOT WORK FOR OUR TYPE OF PROJECTORS. we would have to have a 3 lcd projector, so it would reflect red, green, blue. Our white scenes would not be projected as far as i know, because lcds have single pixels unlike crts that have 3 colors per pixels (maybe im wrong).

[dengez]

if you look on your console tv you will see 3 colors...red, blue, green...everything uses those three colors...i kno my old lcd panel used it...(6.4" clarion)those are the primary colors that make up pixels...there are three portions to a pixel...like in the liliput you have to the divide the number by three because the red, green, and blue make up each individual pixel...



dengez

[ancorp]

thanks, i never noticed that lcds had 3 dotted pixels, always though they were single.....

[KBK]

The original Goo Systems CRT White screen coatings were designed to do similar. We just never told anyone. This was in the first year of the product, so that was a while back.