"@Carol, what display technology is best for reliable operation at -40? We design equipment for northern/arctic operation."
Wow that's pretty cold. I don't know the answer, since most specs say down to -40C. I don't know if the tests just stop there or that they actually fail below -40C. You would probably have to test them yourself. I would guess LEDs are fine. OLEDs might be different . I think the starting is the issue. Once they start they would warm up. Since you are right at the edge of the spec, you could pre-heat if that's really an issue.
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Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.