Display Module; Display Features; Display Interface - Nokia RM-333 Service Manual

RM-333; RM-334; RM-335
System Module and User Interface
Figure 72 User interface block diagram
The interface to the UI capacitive sensing controller is at 3.0V, which is provided from the engine by a
dedicated linear regulator, and a dedicated level shifter provides the interface to allow the otherwise 1.8V
logic levels of the engine to be used on the UI.
The capacitive sensors function by sensing changes in the the charge coupled from one electrode to another
when the users finger is placed close to the electrodes patterns. There are further mechanical domes
associated with this sensing arrangement which only allows the scanning of the charge transfer to occur
when the user presses down on the front of the UI module – this is intended to prevent false key-activations.
Due to the construction of the module (it is mostly glued together) service is not possible, and if faultly, must
be replaced. This includes any faults that are found in the internal microphone or the lower of the two IHF
speakers.
For operational reasons, the modules are supplied unlocalised, and the correct localization front-panel needs
to be attached after the 'bare' module has been installed in the handset.

Display module

Display features

• 2.6" AM OLED QVGA display (240 columns x 320 rows) supports up to 16.7M colors
• Ambient Light Sensor to optimize display brightness and power consumption

Display interface

Display interface block diagram below shows how the display related signals are routed. Hurricane
Figure
display HWA controlling is done via LoSSI bus and pixel data is transferred via ViSSI-12 bus. MeSSI-8 is the
interface between Hurricane display HWA and Falcon OLED display.
As Falcon is self-emissive AM OLED display, no LED driver based backlighting is needed. An external DC-DC
convertor TPS65136 is used for the display powering.
Supply voltages for Falcon display:
1 VIO from the baseband SMPS (1.8V )
2 VBAT from Battery(3.7V)
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