8.4’ DiamondVue User Guide 150.028
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. Although CRTS have dropped in cost
significantly, they 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 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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1.1
