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Q74 (IAS/2017) Science & Technology › New Materials, Energy & Environment-linked Tech › Advanced materials and nanotech Official Key

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 :

Result
Your answer: —  ·  Correct: C
Explanation

The correct answer is option C because all three statements are correct advantages of OLED displays over LCDs.

OLED displays can be fabricated on flexible plastic substrates[2], which is a key advantage over traditional LCD technology. This flexibility enables the fabrication of roll-up displays that can be embedded in fabrics or clothing[3], making statement 2 correct as well. For transparent displays, OLED types work well[4], confirming that transparent displays are possible using OLEDs, which validates statement 3. These advantages stem from OLEDs' distinct production techniques compared to LCD technology[2]. Since all three statements correctly identify genuine advantages of OLED displays over LCDs, option C (1, 2 and 3) is the correct answer.

Sources
  1. [1] https://en.wikipedia.org/wiki/OLED
  2. [2] https://www.sciencedirect.com/science/article/abs/pii/S2773012325000305
  3. [3] https://en.wikipedia.org/wiki/OLED
  4. [4] https://www.nature.com/articles/s41377-020-0341-9
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PROVENANCE & STUDY PATTERN
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Don’t just practise – reverse-engineer the question. This panel shows where this PYQ came from (books / web), how the examiner broke it into hidden statements, and which nearby micro-concepts you were supposed to learn from it. Treat it like an autopsy of the question: what might have triggered it, which exact lines in the book matter, and what linked ideas you should carry forward to future questions.
Q. Organic Light Emitting Diodes (OLEDs) are used to create digital display in many devices. What are the advantages of OLED displays over L…
At a glance
Origin: Mostly Current Affairs Fairness: Low / Borderline fairness Books / CA: 0/10 · 10/10
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This is a classic 'Emerging Tech' question. While NCERTs explain the physics of light and LEDs, the specific applications (flexible, transparent) come purely from Science & Tech current affairs. The key is not memorizing every gadget, but understanding the *structural difference* (OLED has no backlight) which enables these features.

How this question is built

This question can be broken into the following sub-statements. Tap a statement sentence to jump into its detailed analysis.

Statement 1
Can OLED displays be fabricated on flexible plastic substrates, enabling flexible displays compared to Liquid Crystal Displays (LCDs)?
Origin: Web / Current Affairs Fairness: CA heavy Web-answerable

Web source
Presence: 5/5
"OLED displays can be fabricated on flexible plastic substrates, leading to the possible fabrication of flexible organic light-emitting diodes for other new applications, such as roll-up displays embedded in fabrics or clothing."
Why this source?
  • Explicitly states OLEDs can be fabricated on flexible plastic substrates.
  • Mentions resulting flexible OLEDs and applications (e.g., roll-up displays in fabrics), implying flexibility not found with typical rigid LCDs.
Web source
Presence: 5/5
"Compared to flat panel displays built with LCD technology, OLEDs have a number of advantages because of their distinct production techniques, such as their lighter weight, flexible plastic substrates, broader viewing angles, increased brightness, faster response times and higher power economy."
Why this source?
  • Directly compares OLEDs to LCDs and lists 'flexible plastic substrates' as one of OLEDs' advantages over LCD technology.
  • Links flexible substrates to other practical benefits (lighter weight), reinforcing the comparative advantage.
Web source
Presence: 4/5
"This evidence suggests that OLEDs can be grown on barrier coated flexible substrates with optical performance that is comparable or superior to similar OLED devices fabricated on conventional glass substrates."
Why this source?
  • Provides experimental/technical evidence that OLEDs can be grown on barrier-coated flexible (plastic) substrates.
  • Notes optical performance on flexible substrates is comparable or superior to devices on glass, supporting practical feasibility of flexible OLED displays.

Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 5: Environmental Pollution > Amendment rules eozz > p. 99
Strength: 5/5
“• R Classification of Plastics: • Category 1: Rigid plastic packaging • Category 2: Flexible plastic packaging of single layer or multilayer (more than one layer with different types of plastic), plastic sheets and covers made of plastic sheet, carry bags, plastic sachet or pouches. • Category 3: Multi-layered plastic packaging (at least one layer of plastic and at least one layer of material other than plastic) and brand owners' for the purpose of protecting and improving the quality of the environment and preventing, controlling and abating environment pollution. • A committee constituted by the CPCB under the chairmanship of CPCB chairman will recommend measures to the environment ministry for effective implementation of EPR, including amendments to Extended Producer Responsibility (EPR) guidelines.”
Why relevant

Defines and distinguishes flexible plastic materials (e.g., flexible plastic sheets, covers, pouches), showing that plastics exist in flexible-sheet form suitable as substrates.

How to extend

A student could combine this with the fact that display substrates are thin sheets to hypothesize that flexible plastic sheets might serve as display substrates and then check materials used in OLED/LCD manufacturing.

Science , class X (NCERT 2025 ed.) > Chapter 9: Light – Reflection and Refraction > 9.3 REFRACTION OF LIGHT > p. 145
Strength: 4/5
“Does a pencil appear to be displaced to the same extent, if instead of water, we use liquids like kerosene or turpentine? Will the letters appear to rise to the same height if we replace a glass slab with a transparent plastic slab? You will find that the extent of the effect is different for different pair of media. These observations indicate that light does not”
Why relevant

Notes that replacing a glass slab with a transparent plastic slab changes optical effects, implying transparent plastics can function similarly to glass in optical devices.

How to extend

Using the basic fact that displays require transparent substrates, a student could infer transparent plastics might substitute for glass in display construction and investigate whether OLEDs can be deposited on such plastics.

Science-Class VII . NCERT(Revised ed 2025) > Chapter 3: Electricity: Circuits and their Components > Activity 3.7: Let us experiment > p. 30
Strength: 3/5
“• Take two electric cells, an LED of any colour, a cell holder that can fi t two cells (Fig. 3.8a), and two lengths of electric wire.• Remove about 1 cm of the plastic covering from both ends of each wire to expose the metal.• Connect the two wires to the cell holder as shown in Fig. 3.10a.”
Why relevant

Describes commonplace use of flexible plastics as insulating coverings on wires, demonstrating plastics can be used reliably in electrical/electronic contexts and in flexible form.

How to extend

A student could extend this to ask whether similar electrical/thermal/chemical properties allow plastic substrates to host thin-film electronic layers used in OLEDs versus LCDs.

Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 19: Ozone Depletion > Effects on materials > p. 272
Strength: 4/5
“• r Synthetic polymers, natural occurring bio-polymers, as well as some other materials of commercial interest are adversely affected by solar radiation. \• r The application of these materials, particularly plastics, in situations which demand routine exposure to sunlight is only possible through the use of light-stabilizers and/or surface treatment to protect them from sunlight.”
Why relevant

States that synthetic polymers (plastics) are affected by solar radiation and often require stabilizers or surface treatments for durability.

How to extend

A student could use this to anticipate durability challenges for plastic-display substrates (e.g., UV stability, treatments) when comparing long-term performance of flexible plastic OLEDs vs glass-based LCDs.

Statement analysis

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Statement analysis

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