Organic Light Emitting Diodes (OLEDs) are used to create digital display in many devices. What are the advantages of OLED displays over Liquid Crystal displays?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 given below:

1. A

   1 and 3 only

   Option (a) is 1 and 3 only. OLED on flexible plastic and transparent OLED are real advantages, but roll-up and wearable displays are also a documented OLED possibility. Dropping statement 2 is incomplete. This option is not the key.

2. B

   2 only

   Option (b) is 2 only. It ignores fabrication on plastic and transparency, which are also true. This option is therefore wrong.

3. C

   1, 2 and 3

   OLED pixels emit their own light, so they can be built on flexible plastics, rolled or embedded in textiles, and made transparent. All three stem statements are advantages over rigid, backlight-dependent LCDs. Hence 1, 2 and 3 is the official key.

4. D

   None of the above statements is correct

   Option (d) says none is correct. That contradicts well-known OLED device physics. This option is not the key.

Summary. Official key is (c) 1, 2 and 3. Unlike LCD, OLED needs no separate backlight and can be deposited on flexible or transparent substrates. That enables roll-up and clothing-embedded displays as well as see-through panels. All three listed advantages hold. None of the statements is false.