The table compares two display technologies.... | Information and Communication Technology (9-1) 0983 | Paper 1 Mock 21 | Theory

Question 1 Report

The table compares two display technologies.

Feature	LED display	OLED display
Light source	LED backlight behind LCD panel	Each pixel emits its own light
Black level	Dark grey (backlight always on)	True black (pixel turned off)
Thickness	Thicker	Can be very thin/flexible

(a) Using the table, explain the difference between an LED display and an OLED display. [2]

(b) Give two advantages of OLED technology compared to LED technology. [2]

(c) State two devices that commonly use OLED screens. [2]

Answer

Answer Details

(a) The difference between an LED display and an OLED display:

An LED display uses a liquid crystal layer with LED backlighting behind the entire screen to illuminate the pixels. The backlight is always on, which means the screen cannot achieve true black. [1]
An OLED display uses organic compounds that emit their own light when an electric current is applied. Each pixel produces its own light individually, so there is no need for a separate backlight layer. [1]

(b) Two advantages of OLED technology compared to LED:

OLED screens can display true black by completely turning off individual pixels (since there is no backlight bleeding through). This produces higher contrast ratios and more vivid, lifelike colours. [1]
OLED screens can be made thinner and more flexible than LED screens because they do not require a backlight layer, enabling curved or foldable display designs. [1]

(c) Two devices that commonly use OLED screens:

The table compares two display technologies. Feature LED display OLED display Light source LED backlight behind LCD panel Each pixel emits its own light Bla...