NCR RealPOS 70, User Manual

Page: 38 / 306

1-20 Chapter 1: Product Overview
Operator Display
The motherboard, through the LVDS Adapter Board, supports an
integrated Display Head with an LVDS TFT LCD panel.
LCD Panel
The 7402 provides three operator display options.
•
12.1” Dual bulb LVDS TFT display (Sharp LQ121S1DG41)
•
15” Dual bulb LVDS TFT display (Sharp LQ150X1LGN2H).
•
17” Quad bulb LVDS TFT display (Sharp LM170E01 ‐ A4).
The display head has the following characteristics:
•
LVDS interface used to control the LCD
•
RS ‐ 232 interface used to communicate with the touch screen
controller (located on Retail Daughter Card)
•
The display head draws a maximum of 1.5A from the powered RS ‐
232 interface
LVDS
LVDS (Low Voltage Differential Signaling) is an improvement over the
traditional parallel interface. LCD image data is sent on 4 pairs of wires
rather than on 20 individual data lines. The Intel chipset drives LVDS
directly with no additional logic required. Advantages of LVDS
include:
•
Reduces LCD Cable complexity
•
Dramatically reduces radiated emissions
•
Improves robustness of display signal timing
•
Supports longer cable length up to several feet if required