The temperature range of any LCD is almost totally dependent on the fluid inside the display. For example, a display built using LXD's #6 LCD fluid, will have an operating temperature range of -40c to +105c when used in a direct drive mode. The storage temperature goes down to -55c. The temperature specifications for all our fluids are available in our section "First Steps in Designing a Custom Display" . In most applications, a temperature range of -40c to +85c is sufficient, however for unusual applications, LXD has fluids available with operational temperature ranges as low as -55C and as high as +122c .

The voltage threshold of a fluid is not linear across its entire temperature range. The result of this non-linearity is that you need to increase the drive voltage slightly at low temperatures for an acceptable response, and you need to lower the voltage at high temperatures to prevent "ghosting". A properly designed temperature compensation circuit should take care of both of these conditions so as to realize the stated temperature range. Voltage Vs Temperature curves are available for all LXD fluids. 

The graph below shows the graph for LXD's #15 LCD fluid.

Call an LXD Applications Engineer (800)786-8710 for assistance (trying to explain it all here would be prohibitive.) An example of a basic temp compensation circuit is shown in our App Notes Section.