Egad. It sounds too good to be true. I hear the words "blue" "laser" and "projector" juxtaposed and I think big money. Still, if they used some other light source it could be pretty sweet, especially with the ability to scan different geometries.
(Formerly "ReplayMike", but no longer affiliated with the company; these opinions are mine alone.)
It sounds so much better than DLP and D'ILA (more than 4000:1 contrast ratio, switching speed a thousand times faster than DLP,no screendoor effect, true 1080p res using a fraction the bandwidth of QXGA D'ILA, built-in scaling)there must be some sort of catch...
If I remember correctly, GLV is a scanning technology which is why it requires such a higher switching frequency. Instead of displaying the whole screen at one time (like LCD, LCOS, or DLP) or scanning vertically (like CRT) GLV scans horizontally. I wouldn't be surprised if someone out their claimed artifacts caused by this, I'm imagining some sort of motion artifacts or strobing.
[This message has been edited by PhilB (edited 10-04-2001).]
Believe it's been several years since I saw some threads here when this technology was first unveiled. I'd search the archives, but threads this far back often have vanished.
Recall some knowledgeable-sounding folks expressed doubts about consumer applications, saying the technology would require very powerful lasers that drew huge amounts of power. I've also been puzzled about the mechanical-scanning aspects of the system since it seems to take video back to the very earliest TV systems with spinning wheels.
Not dismissing the hardware...who wouldn't want such display features?! But perhaps someone can bring us up to date about laser requirements and other drawbacks. -- John
[This message has been edited by John Mason (edited 10-05-2001).]
In the future, Sony will continue to research and develop [Grating Light Valve] technology with the aim of introducing this device into the professional projection market and high quality home theatre products within the next two years.
It's Achilles heel is the light source. Only a single column of pixels is illuminated, so the light has to be very finely focused in one dimension. Right now the most practical way is with lasers, which are very expensive.
Re its mechanicalness, it is now more so than a DMD.
This looks very good BUT- it will clearly have the same scan rate flicker characteristics of a CRT, which means that 60 FPS won't be enough. Maybe if they are planning to repaint in reverse as the mirror returns for 120 refreshes/second it would be okay. If they intend to do one varying intensity full-length flash per pixel per frame, this will be even more pronounced. It won't even have the latency of CRT to help it.
The design shows the mirror AFTER the lens, which would make it a pretty macro moving part to control. Of course, I doubt they plan on using a swingy mirror like a barcode scanner. Would a rotating facetted cylinder be better?
Odd how the 70's disco 'technology' of colored wheels and mirror balls is being used in the newest digital projection technology.
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