Toshiba 3560 Service Manual page 33

(3) Drive
• LCD control: Drive is effected by the LCD controller on the PNL board.
• What character is displayed in what position: IC7 (main CPU) and IC4 (LCD controller) of the panel
circuit control.
• Message data, executable programs, and character codes: Stored in the PROM on the PNL board.
• Each character on the liquid crystal is made up of 16 × 16 dots or 16 × 8 dots. The whole panel
consists of 320 × 240 dots.
Graphic data is written by the main CPU to the liquid crystal controller at the RAM address corre-
sponding to the position at which it is to be displayed. The LCD controller then sends the data to the
LCD.
PNL CPU
3560/70 DISPLAY
AD15 UD3
AD0 UD0
D7
D0
LCD controller
D3
D0
Display
synchronous
clock
Display
RAM
5 - 8
LCD
Nov. 1997 © TOSHIBA