Display Interface; Display And Keyboard Backlight - Nokia n80 User Manual

RM-91; RM-92
Nokia Customer Care System Module

Display interface

Display module mechanical concept
Figure 97 General diagram of the LCD module
Display features:
• 262,144 colours (18-bit mode)
• partial display function power saving by pausing display process on part of the screen
• no full-image built in RAM, so display accelerator is needed
The display has two different operating modes:
1 normal mode, full screen, 260k colours
2 normal partial mode, 8 colours but only part of the display is active
The interconnection between the LCD module and the UI PWB is implemented with a 40-pin board-to-board
connector.
The display module does not require any tunings in service.

Display and keyboard backlight

The device uses the internal LED driver in N2300 to drive the LEDs in both the keyboards and the display. Each
chain of LEDs consists of 4 LEDs, resulting in 12 LEDs in total.
Current feedback is done through the display LEDs only, with the two keyboard chains being driven from the
display LED voltage through two emitter followers:
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