Backlight Brightness - Silicon Graphics Presenter Owner's Manual

1024 x 768 full-color, ?at-panel monitor with stereo speakers and overhead projection capability.

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Backlight Brightness

driven all the time. Thus the pixels that are not changing in value look

perfectly stable.

A fourth difference, which actually works in the CRT's favor, is the electrical

phenomenon of crosstalk between the pixels on a ﬂat panel. In a ﬂat panel,

whole columns of pixels are powered from the same electronic source. That

source bus is a very thin line that hides in the space between the pixels. The

result is that with some displayed images, the pixels above or below the

image do not receive enough electrons and thus appear lighter than they

should. In the worst case, you may see faint vertical streaks on the display.

You will probably see them only if you have a solid background and are

using the Presenter as a desktop monitor. The streaks are normal in LCD

technology. If they become so bright as to always detract from the display's

performance, however, contact your service provider about a solution to the

problem.

The resolution of the Indy Presenter is 1024 x 768 pixels. Therefore your

display has 1024 x RGB x 768, or 2,259,296, subpixels — all in an area

equivalent to 2.5 times that of a 6-inch silicon wafer. Current technology is

not capable of producing a 100% defect-free active matrix display at

reasonable costs, although yields are improving steadily. Your Presenter

may exhibit a small number of isolated subpixel dropouts, which have been

individually screened to make certain they are in unobtrusive locations.

The output of a ﬂuorescent lamp strongly depends on the minimum bulb

wall temperature, because this temperature determines the mercury vapor

pressure inside the lamp. The colder the temperature, the more mercury

condenses on the inside of the bulb, resulting in decreased light output. At

C, the light output is at approximately 80% of its optimum temperature,

but at 10

C, the light output could easily degrade to 30% of its maximum.

Therefore it takes about one minute for the lamps to warm up to full

brightness from a cold start.

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