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Advantages of QLED | disadvantages of QLED

This page covers advantages and disadvantages of QLED. It mentions QLED advantages or benefits and QLED disadvantages or drawbacks.

What is QLED?

• QLED stands for Quantum dots Light Emitting Diode.
• QLED is made of Quantum dots which are tiny semiconductor crystals having size from 2 nm to 10 nm.
• Quantum dots emit color light based on their size and energy gap of materials used. Bigger the dimension of it, larger is the wavelength of emitted light.
• Different semiconductor combinations are used in the manufacturing of quantum dots which include CdSe, CdS, PbSe, PbS, InAs, InP etc.

QLED image construction

•  QLEDs do not produce light by themselves. Instead QLEDs use backlight unit for illumination. The light emitted by backlight is passed through series of plates to construct the image.
• The six layers used to construct the color image are backlight panel, reflector, polarising filter, TFT array, colour filter glass, quantum dots colour filter and polarising filter.
• Refer QLED versus OLED >> for comparison between QLED and OLED types.

Benefits or advantages of QLED

Following are the benefits or advantages of QLED:
➨Quantum dots used in the construction of QLED resist moisture better and hence QLED based products will have long life.
➨Due to higher resistance to the moisture, it does not require expensive vacuum evaporation process. Hence cost of the QLED is low.
➨It is available in higher display sizes and hence provide more options for the consumers.
➨It is thin and light in weight.
➨The switching speed (between ON/OFF) is very fast.
➨Brightness is about 50 to 100 times brighter compare to CRT and LCD display types.
➨It has lower power consumption. QLED screens are two times power efficient compare to OLED screens and moreover offer about 30 to 40 % improvement in brightness.
➨QLED based TVs are not susceptible to burn-in unlike OLED TV.

Drawbacks or disadvantages of QLED

Following are the drawbacks or disadvantages of QLED:
➨QLEDs do not produce light by themselves. Instead QLEDs use backlight unit for illumination.
➨QLED based TVs suffer from "light bleed" effect. This effect is visible in certain scenes. It results into slight haze around bright objects which blurs lines which should be usually sharp.
➨With QLED based display screens, best viewing angle is dead center. The quality of picture diminishes in both color as well as contrast when viewer moves side to side or between up and down.
➨Less saturated blue

Comparison between OLED, LED and LCD

Refer OLED vs LED vs LCD>> and LED vs LCD>> which mentions basic comparison between OLED, LED and LCD with respect to their features.

LED, LCD related links

LED vs Laser   Difference between LED and LCD   2D LED vs 3D LED   CoB LED   Active matrix LCD vs Passive Matrix LCD   DLP vs LCD  

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