Author Topic: Solved - Why LCD's response slower when cold?  (Read 883 times)

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Offline sam1275

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Solved - Why LCD's response slower when cold?
« on: January 19, 2017, 12:59:22 pm »
Hello.
This question is as short as the title, but I tried google hard and no answer. Could anyone explain it?
Thanks.
« Last Edit: January 19, 2017, 03:29:04 pm by sam1275 »
 

Online PA0PBZ

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Re: Why LCD's response slower when cold?
« Reply #1 on: January 19, 2017, 01:07:59 pm »
I think because the C's are less L when cold(er).
Keyboard error: Press F1 to continue.
 

Offline bktemp

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Re: Why LCD's response slower when cold?
« Reply #2 on: January 19, 2017, 01:13:09 pm »
Because the liquid crystals are more viscous when cold.
 

Offline BrianHG

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Re: Why LCD's response slower when cold?
« Reply #3 on: January 19, 2017, 01:14:27 pm »
The liquid crystal is crystals suspended in an oil type fluid.  Remember, when the LCD crystals align and polarize in the fluid, they are mechanically moving and aligning.  As the temperature cools, the viscosity of the oily fluid changes making it difficult for the crystals to move as fast as they can.  Also, since there are so many formulas out there for different voltages and response speeds to allow features like passive scanning display LCDs which wont flutter, the fluid might be designed to be slow and viscus amplifying the cool down slowing effect.

You can clearly see this with LCDs where you push your finger over while operating, smearing around the fluid, disrupting the fluid and crystal alignment effect, with a freezing cold LCD, this fluid will move in a much slower smeary fashion.
« Last Edit: January 19, 2017, 01:16:56 pm by BrianHG »
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Offline sam1275

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Re: Why LCD's response slower when cold?
« Reply #4 on: January 19, 2017, 03:28:31 pm »
Thank you everyone!
 


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