• Partial display function enables power saving by pausing display process on part of the screen. Partial mode
size is 50 lines x 352 pixels and only 8 colors are used.
• S60 ViSSI interface is used between the display module and the engine HW to transfer display data. LoSSI
part of this interface is used to transfer display commands.
• S60 command functions (Display controlling functions and power controlling functions) are available.
• LCD display driver IC is mounted on the display glass panel. Other external components (Power IC, EEPROM
and passive components) on the display module are located on the FPWB of the display module and the
usage of these is depending on the supplier.
• FPWB design is done in such a way that length minimized and thickness minimized display modules can be
done by using the same flex. Flex is just folded differently in these two cases.
The module includes:
• FPWB including connector, discretes and driver circuits necessary
• Display panel (glass)
• Drivers including display controller and 352 x 50 x 3 bits RAM
• Lighting system: light guide, LEDs and necessary optical sheet
• Supporting mechanics
• Metal frame (stainless steel)
• Plastic frame (ABS/ PC)
The interconnection between the LCD module and the Nokia engine is implemented with a 40-pin board-to-
board connector.
K2 Display is controlled via LoSSi and MeSSi-16 interface by Helen3. All LoSSi and MeSSi-16 signals go through
micro coaxial cables to the fold part. On fold part Messi-16 signals go through the EMC filtering ASIPs to Tornado
ASIC where MeSSi is converted to ViSSi-18 interface. ViSSi-18 signals go through the EMC filtering ASIPs to K2.
LoSSi signals go through the EMC filtering ASIPs to K2 display. See the figure below:
Figure 108 LoSSi signals in RM-42
RM-42
System Module
Nokia Customer Care
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Company Confidential
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