LCD vs OLED vs QLED
09.27.2023
LCD is now being surpassed by other display technologies, but it is not completely behind in the past. LCDs are gradually being replaced by OLEDs or Organic Light Emitting Diodes.
OLEDs use a single glass or plastic panel, compared to LCDs, which use two. Because OLEDs don't require a backlight like LCDs do, OLED devices like TVs are typically thinner and have deeper blacks because each pixel in an OLED display is lit individually. If the LCD is mostly black but only a small portion needs to be lit, the entire rear panel remains lit, causing light to leak from the front of the display. OLED screens avoid this, while having better contrast and viewing angles and lower power consumption. Using plastic panels, OLED displays can bend and fold on their own and still work. This can be seen in smartphones, such as Galaxy Fold; or in the iPhone X, which bends the bottom of the display over itself so that the display's ribbon cable can reach out to the phone, eliminating the need for bottom border.
However, OLED displays tend to be more expensive and can suffer from burn-in like plasma-based displays.
QLED stands for Quantum Light Emitting Diode and Quantum Dot LED. QLED displays were developed by Samsung and can be found in newer TVs. QLED works most similarly to LCD and can still be considered a type of LCD. QLED adds a thin film of quantum dots to the LCD, which dramatically increases color and brightness compared to other LCDs. Quantum dot films consist of tiny crystalline semiconductor particles. The color output of the crystalline semiconductor grains can be controlled.
When choosing between QLED and OLED displays, QLED has higher brightness and is not affected by burn-in. However, OLED displays still have better contrast and deeper blacks than QLED.