Organic Light Emitting Diodes (OLEDs) are used to create digital display in many devices. What is/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 codes given below:

The correct answer is C, all three statements. The core concept is that an OLED is self-emissive: each pixel emits its own light from an organic layer between electrodes. An LCD only modulates light passing through liquid crystal cells and needs a backlight. That one difference explains all three advantages.

• Statement 1 is correct. Organic layers are thin and can be deposited on flexible plastic substrates such as PET or polyimide. LCDs need rigid glass for their cell structure, so flexibility is hard to achieve.
• Statement 2 is correct. Flexibility plus thin layers allows rollable and foldable screens, which is the basis of wearable displays.
• Statement 3 is correct. With no backlight and transparent electrodes, an OLED panel can be see-through. Transparent OLEDs are already sold commercially; a conventional LCD cannot be made transparent this way.

Mains link: flexible electronics, display manufacturing under Make in India, and energy efficiency, since black pixels in an OLED consume no power.

Trap: candidates assume that since OLED is the better technology, every claim is true. Check each statement against the physics of self-emission versus backlit transmission.