General > General Technical Chat
LCD display failure mode
BurningTantalum:
Just out of interest - what is the failure mode for the LCD display shown in the attached picture?
BT
MathWizard:
Do you know it's history ? Did it just stop working, or did someone sit on it ?
Is it some optical effect after the screen was crushed, and the liquid crystal spreads out like that ?
wraper:
Is it like this when staying not powered for a longer time or it becomes normally blank? This could have nothing to do with LCD itself but the fact its not driven properly.
AVGresponding:
I'd guess it's a burn mark from the CCFL backlight.
Burn is a strong term for this really, it's more a heat-cycling over time, that changes the optical properties of the diffuser/polariser.
ataradov:
This is a very common failure mode for old LCDs. It happens even on devices without backlight or heat exposure, just over time. There was a post on this forum from a few days ago about similar issue with some HP calculator.
I don't know the exact reason for this, but I don't think there are solutions for this. In some cases people made reproduction LCDs (TRS-80 Pocket Computer is one such example).
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