Toshiba T4500 User Manual page 14

1.6 Sidelit Liquid Crystal Display (T4500 & T4600)
The sidelit Liquid Crystal Display (LCD) is composed of an LCD module, a Fluorescent Lamp
(FL), and an FL inverter board.
1.6.1 LCD Module (T4500 & T4600)
The T4500/T4600 sidelit LCD supports 640 x 480 pixels with a High Resolution Graphics Sub-
system (HRGS) and 64 levels of gray. The HRGS includes the functions of the Video Graphics
Array (VGA).
The LCD receives vertical and horizontal synchronizing signals, 8-bit data signals (4-bit upper data
signal and 4-bit lower data signal), and shift clock for data transmission. All signals are CMOS-
level compatible.
The sidelit LCD is shown in Figure 1-9 and its specifications are described in Table 1-3.
Number of Dots (dots)
Dot pitch
Display area
Contrast
FL current
FL frequency
1-14
Figure 1-9 Sidelit LCD
Table 1-3 Sidelit LCD Specifications
Item
(mm)
(mm)
(mA)
(KHz)
Specifications
640 x 480
0.30 (W) x 0.30 (H)
192 (W) x 144 (H)
17:1 (typically)
5.0
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