Comparison of LED and LCD

Comparison of LED and LCD

S.No	LED	LCD
1.	Consumes more power 10 – 20 mw power per digit	Essentially act as a capacitor and consumes very less power required 10 – 200 µ W power per digit
2.	Because of high power requirement it requires external interface circuitry when driven form IC s	Can be driven directly form IC chips
3.	Good brightness level	Moderate brightness level
4.	Operating temperature range -40o C  to 85o C	Temperature range limited to -20o C to 60o C
5.	LED life is around 1,00,000 hours	Lifetime is limited to 50,000 hours due to chemical degradation
6.	Emits light in red orange, yellow green and white	Invisible in darkness – requires external illumination
7.	Operating voltage range is 1.5 to 5V dc	Operating voltage range is 3 to 20 V dc
8.	Response time is 50 to 500 ns	Has a slow decay time – response time is 50  to 200 ns
9.	Viewing angle 150o	Viewing angle 100o