User Guide

User interface

Display interface

Display module mechanical concept - front

Display features:

The display is an S60 display module CG-Siligon Active matrix color LCD. It is capable of showing 16,777,216

colours. It incorporates a backlight system with 2 +2 LED serial (display leds are connected in two two-led

series).

• Partial display function power saving by pausing display process on part of the screen.

• Built-in RAM capacity 240lines x 320rows x 24bits = 184320bits.

The display has two different operating modes:

1 Normal mode, Full screen, 16M colours

2 Partial 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.

Display is controlled via MeSSi-8 interface by Helen3. All MeSSi-8 signals go through the EMC filtering ASIPs.

The display module does not require any tunings in service.

Display and keyboard backlight

The device has one LED driver (SMPS) that is used to drive 4 display LEDs and 3 S60 keypad LEDs. The display

LEDs are connected in to two LED series.

The TP keyboard backlight is made with Electroluminance. Current adjustment of the driver is done from the

display LED branch, and keyboard and function current also depends on the display brightness. In a typical

use case, keyboard LEDs are turned ON only in dark ambient lighting conditions.

Control signals for LED driver are:

RM-208

Nokia Customer Care System Module

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