INTRODUCTION
INTRODUCTION
1
Section
1
LCDs
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.
