Liquid crystal material is a fluid and the like many fluids, the viscosity of the fluid changes as a function of temperature. At very low temperatures, the viscosity can be dramatically increased. Like any fluid under the influence of a force, it then moves more slowly. In LCDs, molecules are under the influence of an electric field. When the fluid becomes more viscous, the field has less impact and the result is a slower response. The specification for each display defines the range of temperatures of use and the response speeds. If you need faster response at low temperatures, you may consider keeping the unit warm with an external heating source such as a warm pocket.
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