Organic light-emitting diodes (OLEDs) are used to create a digital display on many devices. What are the advantages of OLED displays over liquid crystal displays (LCDs)?
$1.$ OLED displays can be fabricated on flexible plastic substrates.
$2.$ Roll-up displays embedded in clothing can be made using OLEDs.
$3.$ Transparent displays are possible using OLEDs.

Select the correct answer using the code(s) given below:

Which of the following is not a type of TV?

Consider the following statements:
$1$. The filament of a halogen lamp is made of Wolfram.
$2$. The white coating on a fluorescent lamp is a phosphorus coating.
$3$. The outer bulb in a vapour lamp is filled with a nitrogen/argon mixture to maintain an even lamp temperature.
Which of the statements given above is/are correct? Select the correct answer using the codes below: 

Consider the following statements with respect to light-emitting diode:
1. Light-emitting diode (LED) lamps offer longer service life as compared to Compact Fluorescent Lamps (CFLs).
2. LED lamps are more energy-efficient as compared to the CFLs.
Select the correct answer using the code(s) given below:

Consider the following statements:
$1.$ LED-based lamps do not contain mercury.
$2.$ LED lights never fail abruptly, but there is a gradual decrease in the output.

Which of the statements given above is/are correct?

Organic light-emitting diodes (OLEDs) are used to create a digital display on many devices. What are the advantages of OLED displays over liquid crystal displays (LCDs)?
$1.$ OLED displays can be fabricated on flexible plastic substrates.
$2.$ Roll-up displays embedded in clothing can be made using OLEDs.
$3.$ Transparent displays are possible using OLEDs.

Select the correct answer using the code(s) given below: