found this great 26 page(web pages) article explaining different types of lcds, how contrast is measured, response time etc and why 16.7 million colors doesn't neccessarily mean 24 bits....

http://www.xbitlabs.com/articles/other/dis.../lcd-guide.html

Nice find. Thanks for sharing.

you're welcome .... its amazing what you can find accidentally...found this googling for "high transmittance lcd" .... and found this:

http://www.flatpanels.dk/panels.php

you can look up a number of lcds and find out which panel is actually in them
the first article mentions that s-ips LCDs are best at accurate color reproduction, if you type in "s-ips" into the second link, it will show a list of lcds of s-ips type.... but unfortunately, for the samsungs in the LCD Transmission thread, if you type in 740n or 740b etc, it merely says a generic statement like "17 inch 8ms lcd" which I take to mean basically that samsung throws any panel they want into them...sigh...

and also found accidentally is that many small mono lcds like in commercial projectors are 20% transmittant...

Gotta love THAT number!!! I wish . . .

I could believe 20%. A friend of mine has a commercial projector and recently its lamp died, AU$600 2000hr lamp but only lasted 900. So he came to me and asked if there was any way to modify it to accept a cheap lamp. We used a cheap 10° MR16 halogen lamp in it and I was amazed at how much light passed though the LCDs. The lamp is only 50W but it produced a reasonable image in complete darkness. Of coarse it was a little yellow and the screen size was reduced but for only 50 watts I could only assume the LCD was more efficient that the ones we use.

DJ

I would assume so. Remember, these manufacturers know that their lcds will not need a wide viewing angle or other types of surface treatments. So they can specifically optimize their panels for transmittance. The panels we use are designed for exactly the opposite use. Transmittance is probably a secondary or even tertiary concern. Viewing characteristics are probably the chief concern.

yeah, that figure was off a sony site from about 4-5 years ago...hey....he might try 18wheelers site, his buddy YWH from diyaudio can get all sorts of lamps and even has a replacement pdf that lists which bulbs of his can be retrofitted into commercial pjs heres 18wheelers site:

http://www.diypro.us/

some interesting bulbs

In my quest to verify that the 9" low temp pollysillicon LCD I use is ultra transimitent,
I have found some interesting reading on the subject.

Here's a DLP BIAS link from a study comisioned by the goons at TI,
Still good reading though on LCD types...

http://www.clarityvisual.com/pdfs/technote..._Projection.pdf

And some copied info on pSi LCDs. There still talking about the little guys, but the larger pSi single LCDs must follow these basic principals in comparison to "amorphous silicon", which is not crystalized.


The other type of display engine used in desktop and portable projectors relies on polysilicon LCD panels. The majority of these chips are made by Epson and Sony, and typically measure from 0.9 to 1.5" diagonal.

Projectors rely on three of these panels, one for each of the three primary light colors. Special beam-splitting prisms with dichroic coatings separate the light into red, green, and blue components. These are then passed through the panels, and reflected so that they are recombined into a single image as they pass through the projector's optics for delivery to the screen. This approach creates a problem not faced by single-panel solutions: the three images must be precisely aligned in order to have a perfectly converged image on the screen. Fortunately, most current projector models show well-converged images. The colors displayed by some LCD projectors also tend to look better than some DLP projectors, especially in the The polysilicon term refers to how the panels are fabricated. Large, direct-view active matrix LCD panels - such as those used in notebook computers or desktop monitors - are built on an amorphous silicon layer on a thin glass substrate. The amorphous silicon is not particularly efficient, and requires more space to create the transistors required for the pixel switching.

Projector panels have to be tiny, and designers can't afford to waste any more space than absolutely necessary for transistors, so it pays to use a more efficient design. The silicon is deposited on quartz substrates, which is then heated and cooled so that the silicon layer forms tiny crystals. This layer is more efficient than amorphous silicon, so the transistors can be smaller. Quartz substrates must be used because glass would melt under the high temperatures.

Even with polysilicon LCD technology, there is more space between the pixels. Some images appear to be composed of a grid of tiny squares, which is often called the "screen door" effect, because it resembles what you see when you look through a screen door. This effect is more pronounced with lower resolution projectors.

Polysilicon LCD panels can switch pixels on and off quickly, but not as fast as DLP panels. As a result, some motion images - such as television or movies - may look better on a DLP projector than an LCD.

While I was searching for some LVDS info I came across this site. It has a couple of online seminars by Dick McCartney, the head technical honcho at National semiconductor. This one is about how an LCD operates and this one is about display drivers. Some of it is a bit technical but still very informative. They each run for about an hour. So sit back and enjoy.

DJ

mmm 20% trasmitancy.... but you are forgetting those are monocromes (no color layer). If our LCD's are 6.6% (that's the number I always said and used as AVERAGE) then the 20% sounds right to me for the same LCD without the color filter.

I personally do not belive it is posible to have hi contrasted (by hi I mean 400:1 at least) and more than 9% trasmitance COLOR LCD. I believe this is reduced to a tecnological limit.