LCDs
INTRODUCTION
INTRODUCTION
1
Section
About LCD Monitors
What you gain by using an LCD monitor in your industrial controls
are the future of display technology. CRTs although they have
dropped in cost significantly, do not offer the performance, reliability,
and mounting options available with LCDs. LCD monitors consist
primarily of an LCD, Video Board and a Back Light video. The LCD
determines to a large extent the viewing angle, brightness and contrast. Beyond that it is the
function of the video board which converts the analog RGB (Red, Green, Blue) signals from a
standard video card to a high quality, digital RGB that the LCD can display.
Recently the video card has taken on a new role. It is the responsibility of this device to “scale” a
particular video resolution to the “native” resolution of the LCD. Simply, consider that a computer is
putting out a VGA [640x480] resolution signal, yet the LCD that is connected is an XGA
[1024x768] display. The displayed picture would be in the center 1/3 of the LCD. With the
introduction of the scaling engine. The converter will mathematically recalculate the 640x480 to
1024x768. This may sound simple but it is in fact a complex algorithm that adjusts for different
aspect ratios and pixel alignment, essentially smoothing text and graphics to produce a picture
that is pleasant to the eye.
All Vartech displays from 12.1” (800x600) to 23.1 (1600x1200) incorporate scaling engines in the
converter card.
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