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diff --git a/LCD writing tablet functional principal/index.md b/LCD writing tablet functional principal/index.md new file mode 100644 index 0000000..c127c09 --- /dev/null +++ b/LCD writing tablet functional principal/index.md @@ -0,0 +1,44 @@ +--- +description: "Cholesteric liquid-crystal drawing tablet" +created: 2024-05-19 +--- + + + +## Prelude + +I recently stumbled across drawing tablets seemingly works by the means of magic, +the search term is: `LCD writing tablet` +I have a thing for daylight viewable screens, so the allure was irresistible for me. + +After one quick trip to the local hardware store, and subsequently the local hacker space, +i was able to examine the technology first hand, and for low monetary cost too, i might add. + +## Properties + +The properties are as follows: + +- Daylight viewable +- Passive working principle (only requires power to clear the display) +- Pressure amount sensitivity (light pressure = thin line, hard pressure = thick line) + +## Layers + +The tablet consists of a sandwich of 3 layers: + +- A dark background +- A layer of cholesteric liquid-crystals +- A piece of translucent plastic + +## Functional principal + +The means of function of this device, is merely a property of how the cholesteric liquid-crystal work: + +[*"crystals flow at different rates, depending on the direction of pressure being applied"*](https://new.nsf.gov/news/how-liquid-crystal-displays-work-ewriter#:~:text=crystals%20flow%20at%20different%20rates%2C%20depending%20on%20the%20direction%20of%20pressure%20being%20applied) + +[*"anisotropic flow causes the molecules to order themselves to reflect light in those places where a stylus touches the plastic sheet."*](https://new.nsf.gov/news/how-liquid-crystal-displays-work-ewriter#:~:text=anisotropic%20flow%20causes%20the%20molecules%20to%20order%20themselves%20to%20reflect%20light%20in%20those%20places%20where%20a%20stylus%20touches%20the%20plastic%20sheet.) + +## Sources: +1. [How Liquid Crystal Displays Work in an eWriter - new.nsf.gov](https://new.nsf.gov/news/how-liquid-crystal-displays-work-ewriter#:~:text=The%20liquid%20crystals%20are%20surrounded,that%20they%20are%20less%20reflective.) +2. [Cholesteric liquid crystal - wikipedia.org](https://en.wikipedia.org/wiki/Cholesteric_liquid_crystal) +3. [Anisotropy - wikipedia.org](https://en.wikipedia.org/wiki/Anisotropy) \ No newline at end of file |