Planar LC12 Manuale Utente
Title: Product Specification: LC12 High-Bright Monitor
Page 6 of 24
Document Number: 023-0284-01
Revision: A
2.8 LCD Controller Board
The LCD Controller Board incorporates components necessary to drive the LCD Panel (Section
6.7). Accepting VGA and VESA video standards (Section 1.2), these video signals are digitized and
6.7). Accepting VGA and VESA video standards (Section 1.2), these video signals are digitized and
processed for the LCD Panel. Due to the LCD Panel’s fixed video resolution (800 x 600), the LCD
Controller Board will perform independent horizontal and vertical zoom and shrink scaling of
specified video resolutions less than or greater than the LCD Panel’s video resolution to fully
specified video resolutions less than or greater than the LCD Panel’s video resolution to fully
accommodate the LCD Panel’s capability.
Magnification or reduction of specified video resolutions to match the native LCD Panel’s
resolution incorporates scaling algorithms minimizing aliasing and image distortion. The LCD
Controller Board includes the following characteristics:
Controller Board includes the following characteristics:
•
Per pixel scaleable filters providing text sharpening and graphics smoothing for improved
image quality.
image quality.
•
Color depth enhancement by performing spatial-temporal dithering reducing visual artifacts.
2.9 Grounding
Two (2) types of ground are provided: Chassis and Signal ground.
2.9.1
Chassis Ground
The chassis ground is a conductor that is grounded to the earth within user circuitry.
It is not used for current carrying purposes. It is used only for non-current carrying
It is not used for current carrying purposes. It is used only for non-current carrying
purposes such as electromagnetic compatibility (EMC).
2.9.2
Signal Ground
Signal ground is electrically connected to chassis ground via the LCD Panel.
However, there are no DC currents carried through this interconnect.
However, there are no DC currents carried through this interconnect.
2.10 External And Internal Controls
A single external “Video Gain” control compensates for the white state (full white) video signal
level range specified in Section 4.2.1 in achieving sixty-four (64) shades of gray.
level range specified in Section 4.2.1 in achieving sixty-four (64) shades of gray.
External horizontal and vertical image positioning control(s) are provided to accommodate for
the undefined delay between sync and video data edge referred to as Front Porch / Back Porch in
the undefined delay between sync and video data edge referred to as Front Porch / Back Porch in
Figure 9.