User Guide

CC Technical Documentation System Module
RM-11
Issue 1 02/2004 ©2004 Nokia Corporation Confidential Page 13
Figure 7: Shared LED driver circuit for LCD and keyboard backlight
LCD Backlight
The LCD backlight consists of two white LEDs, which are integrated with the
LCD module.
Keyboard Illumination
The keyboard light consists of six white LEDs on the UI board. They are placed under the
keyboard for proper illumination of the keypad.
LCD Display
The LCD is a CSTN 130 x 130, full-dot matrix display with 12bit (4096 colors) color reso-
lution and a single pixel border area around the content area, which makes the total
active area 128 x 128 pixels.
Table 5: LCD general specifications
LCD parameter Value
Glass size, width x height x thickness 33.98 mm x 37.95 mm x 1.71 mm
Glass thickness 0.50 mm
Viewing area (width x height) 30.29 mm x 30.29 mm
Active pixel area (width x height) 27.29 mm x 27.29 mm
Number of pixels 130 x 130 pixels
Technology CSTN (color super twisted nematic)
Operating temperature range
-25
o
C to +70
o
C
Main viewing direction 6 o’clock
Illumination mode transflective
Color tone
Background: Neutral/Black
LED Driver
FB
V in
Gnd
Cx
En
Is
Ext
Vovp
Rlcd
R
Schottky
Coil
Cosc
Keyboard Illumination
LCD Illumination
VBAT
DLIGHT
Cout
Cin