-it is passive device. -dynamic light scattering
-power dissipation is in Micro watt.
-Response time is in mili second.
Operating time is 50000+ hrs
-used in display device.
-Material used is liquid crystal that are activated by electric current
-It display of numeric and alphanumeric characters in segmental and dot matrix display.
-It doesn't produce any illumination of it's own. i.e help of external source.
👉LDR(Light Dependent Resister)
-LDR most commonly used photo sensor.
-LDR is a bidirectional resistor .
-Material used for fabrication is CdS;Se.
-Range of resistance 5ohm to 0.75 mega ohm
👉IR Emitters
-convert electrical energy into optical radiations.
-in forward bias emits a beam of rediant flux which strength is almost linearly. - Application _card and paper tape reader;shaft encoder;data transmission;instrusion alarm. -The shaft encoder cam produce 150 micro watt of radiation energy at 1.2 v and 50 mili ampear
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