Forehead Thermometer: How Liquid Crystals Work

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Liquid crystals in forehead thermometers change color in response to temperature variations, indicating body heat. These crystals are a chemical mixture that can be prepared at home, as outlined in a provided link. The discussion highlights the use of cholesteryl ester-based liquid crystals, known as "Chiral" liquid crystals, in these devices. Additional resources for understanding liquid crystal terminology and device functionality are also shared. Overall, the conversation focuses on the science behind forehead thermometers and the properties of liquid crystals.
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Yoy guys, I am working on an invention recently which is related to liquid crystals. I want to know how liquid crystals in a forehead thermometer works. Or basically, how a forehead thermometer works! Thx guys!
 
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The device is explained here. Liquid crystal terminology can be found here. The cholesteryl ester based liquid crystals are termed "Chiral" liquid crystals.
 

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