• Numbers of colours up to 262k
• Partial display function; power saving by pausing display process on part of the screen.
• Built-in RAM capacity 240 columns x 320 rows x 18 bits = 1,382,400 bits
The display has two different operating modes:
• Normal mode, Full screen, 262k colors
• Partial idle mode, 8 colours but only part of the display is active
The interconnection between the LCD module and the Nokia engine is implemented with a 24-pin board-to-
board connector.
The display is controlled via a MeSSi-16 interface with an 8-bit bus by the application processor. All MeSSi-16
signals go through the EMC filtering ASIPs. The display module does not require any tunings in service.
Display and keyboard backlight
The device uses a LED driver in N9002 to drive the LEDs in both the keyboards and the display. The chain of
LEDs on the UI board consists of four LEDs. In addition, there is a separate set of LEDs as part of the UI module.
Current feedback is done through the display LEDs only, with the chains being driven from the display LED
voltage through an emitter follower, controlled by BETTY_GenOut 1 into V6509 0V / 1.8 V LED control.
RM-132; RM-133
System Module
Nokia Customer Care
Issue 1
COMPANY CONFIDENTIAL
Page 9 –17
Copyright © 2006 Nokia. All rights reserved.
