Visual defects (pixel)
Pixel defects can be checked by controlling the
display with Phoenix. Use both colors, black and
white, on a full screen. R, G, B are also helpful.
The display may have some random pixel defects
that are acceptable for this type of display. The
criteria when pixel defects are regarded as a display
failure, resulting in a replacement of the display, are
presented in the following table.
Table 7 Pixel defects
Bright sub-pixels
(sometimes called on-pixels or stuck-on) are
characterized by the appearance of bright/colored
pixels in, for example, black full screen picture.
Dark sub-pixels
(sometimes called off-pixels, stuck-off, or black
pixels) are characterized by the appearance of dark
pixels in white, red, green, or blue full-screen
picture.
Combined sub-pixel
defects are characterized by at least two sub-pixels
defects (bright or dim) being closer than 5 mm to
each other.
Temporal sub-pixels
(sometimes called blinking defects) exhibit
temporal variations not related to any steady-state
video input. Temporal sub-pixel defects may be
intermittent, exhibit a sudden change of state, or
be flickering.
Table 8 Defects table
Item
Bright dot (sub-
pixel) defect
Dark dot (sub-
pixel) defect
Total
1
Defect counts
Not allowed
2
Combined sub-
pixel defect
Not allowed
3
Temporal sub-
pixel defect
Not allowed
Note:
Blinking pixels are not allowed in normal operating temperatures and light conditions.
Introduction to display troubleshooting
The display module used is based on AM OLED technology and supports display format of 360 columns x 640
rows. The dimension of the display module is 53.76 mm x 97.16 mm x 2.21 mm. The module will interface
to the phone via FPC with a 20 pins board to board connector.
The following references on the PWB help in the effective debugging and troubleshooting of the display.
RM-626
BB Troubleshooting and Manual Tuning Guide
Issue 1
COMPANY CONFIDENTIAL
Page 3 – 31
Copyright © 2011 Nokia. All rights reserved.
