Liquid crystal displays
•Smaller, lighter, and … no radiation problems.
•Found on PDAs, portables and notebooks,
… and increasingly on desktop and even for home TV
•also used in dedicted displays:
digital watches, mobile phones, HiFi controls
•How it works …
–Top plate transparent and polarised, bottom plate reflecting.
–Light passes through top plate and crystal, and reflects back to
eye.
–Voltage applied to crystal changes polarisation and hence colour
–N.B. light reflected not emitted => less eye strain
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