QLED Technology: Advantages and Disadvantages

This page explores the pros and cons of QLED technology, outlining its benefits and drawbacks.

What is QLED?

Introduction:

• QLED stands for Quantum dot Light Emitting Diode.
• QLEDs are constructed from Quantum dots, which are minuscule semiconductor crystals ranging in size from 2 nm to 10 nm.
• These Quantum dots emit colored light determined by their size and the energy gap of the materials used. Larger dimensions correspond to longer wavelengths of emitted light.
• Various semiconductor combinations, such as CdSe, CdS, PbSe, PbS, InAs, and InP, are employed in the manufacture of quantum dots.

QLED image construction

• QLEDs do not generate light themselves. Instead, they rely on a backlight unit for illumination. The light from the backlight passes through a series of layers to form the image.
• The six layers involved in creating the color image are the backlight panel, reflector, polarizing filter, TFT array, color filter glass, quantum dots color filter, and another polarizing filter.

Benefits or Advantages of QLED

The following are the benefits of using QLED:

• Quantum dots used in QLED construction exhibit better moisture resistance, leading to a longer lifespan for QLED-based products.
• Due to this enhanced moisture resistance, the expensive vacuum evaporation process is not required, resulting in lower production costs for QLEDs.
• QLED displays are available in larger sizes, providing more options for consumers.
• QLED displays are thin and lightweight.
• They boast a very fast switching speed (between ON/OFF states).
• Brightness levels are approximately 50 to 100 times higher compared to CRT and LCD displays.
• QLED technology offers lower power consumption. QLED screens are twice as power-efficient compared to OLED screens and provide about a 30 to 40% improvement in brightness.
• QLED-based TVs are not susceptible to burn-in, a common issue with OLED TVs.

Drawbacks or Disadvantages of QLED

Here are the disadvantages of QLED:

• QLEDs require a backlight unit for illumination, as they do not produce light independently.
• QLED-based TVs can suffer from a “light bleed” effect. This is noticeable in certain scenes, resulting in a slight haze around bright objects, blurring lines that should be sharp.
• The optimal viewing angle for QLED displays is directly in the center. Picture quality, in terms of both color and contrast, diminishes when the viewer moves from side to side or up and down.
• Less saturated blue colors compared to OLED