Lcd Controller; Data Transmission Method - Toshiba 4560 Service Manual

(3) Drive
• LED control: Driven by liquid crystal controls in the panel board
• What character is displayed in what position: Controlled by IC7 (main processor) and IC4 (liquid
crystal controller) in the panel circuit
• Message data, executable programs, and character codes: Stored in the PROM on the panel
board.
• Each character on the liquid crystal is made up of 16 x 16 dots or 16 x 8 dots. The whole panel
consists of 320 x 240 dots.
Graphic data are 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.
AD15
PNL-CPU

Data Transmission Method

FRAME
240
LOAD
FRAME
LOAD
CP
D0-D3
4560/4570 DISPLAY
UD3
AD0 UD0
D7
D0

LCD controller

1/tF
1 2
Display
RAM
Fig. 4.1-3
1 2
240
CP x(320/4) pulses
5 - 8
D3
D0
Display
synchronous
clock
LCD
1/tF
1 2
240
Nov. 1997 © TOSHIBA