T3400/T3400CT Maintenance Manual
1.6 Monochrome LCD
The monochrome LCD is composed of an LCD module, a Fluorescent Lamp (FL), and an
FL inverter board.
1.6.1 Monochrome LCD Module
The T3400 monochrome LCD supports 640 x 480 pixels with a video controller and 64
levels of gray. The video controller includes the functions of the VGA and SVGA.
The LCD receives vertical and horizontal synchronizing signals, 8-bit data signals (4-bit
upper block data signal and 4-bit lower block data signal), and shift clock for data transmis-
sion. All signals are CMOS-level compatible.
The sidelit LCD is shown in Figure 1-7 and its specifications are provided in Table 1-3.
Figure 1-7 Monochrome LCD
Table 1-3 Monochrome LCD Specifications
Item Specifications
Number of dots (dots) 640 x 480
Dot pitch (mm) 0.24 (W) x 0.24 (H)
Display area (mm) 176.8 (W) x 132.6 (H)
Contrast 18:1 (typically)
FL current (mA) 4.0 (full-power mode)
FL frequency (KHz) 44
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