Abstract
Access to display pixels for the purpose of identification
of a defect in a sealed display is difficult. Thus, it will be useful to investigate
the physical defects in a passive-matrix organic light-emitting diode (PMOLED)
display, such as electrically open anode or cathode, shorted anode or cathode
or pixel short by driving the display as red, blue, green, white, or black
image and observing the visual defects. In this paper, we associate a black
horizontal line in a display with electrically open row, dark/dim horizontal
line with shorted cathode, dead pixel or bright horizontal line or dark/dim
vertical line with electrically shorted pixels and black vertical line with
either electrically short or open anode. Further, we find a pixel short to
be a complicated defect which manifests itself in a display in several ways
depending on the image displayed. For example, a short in red pixel will result
in bright horizontal line in a blue or green image but not in red image and
its behavior in white or black image will be entirely different. However,
by clearly understanding the cause of appearance of a defect, we also demonstrate
that by a specific driving methodology, it is possible to identify a physical
defect. We have used SPICE simulation to support the physical observations.
© 2012 IEEE
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