Description Of Operation; Dot Matrix Lcd Circuit - Toshiba e-STUDIO200L Service Manual

5.4

Description of Operation

5.4.1

Dot matrix LCD circuit

1) Structure
The LCD panel is an STN blue mode transmissive type LCD with 640x240-dot display capacity. It
consists of a driver LSI, frame, printed circuit board, and lateral type CCFL backlight.
* STN: Super Twisted Nematic
* CCFL: Cold Cathode Fluorescent Lamp
2) Block diagram
XSCL
UD0
UD1
UD2
UD3
WF
LP
LCDEN
VDD
Power
GND
supply
V0
VEE
e-STUDIO200L/202L/203L/230/232/233/280/282/283
CONTROL PANEL
( 640 x 240 )
IC5
120
IC6
120
Fig. 5-4
IC1 IC2
160 160
LCD PANEL
640 x 240 DOTS
Fig. 5-5
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5 - 12
IC3 IC4
160 160