LED screens are still LCD screens.

I wish to clarify something regarding LED screens. First, this is how an LCD screen works:

1. White light is produced
2. The light is selectively filtered
3. The remaining light forms the image

The LCD is involved in step 2. Electric signals are used to control how much light is allowed to pass through the LCD.

The difference between conventional LCD screens and LED screens lies in step 1. In traditional LCD screens, the light in step 1 is produced by a cold cathode, just like a fluorescent tube. In LED screens, the light is produced by LEDs instead. LED screens still use the LCD in step 2 - that means LED screens still have LCDs. Sometimes, LED screens are more accurately mentioned as "LED backlit".

The listed advantages of LED lighting are:

• Thinner - if the LEDs are placed at the sides of the display, it can be made even thinner
• Less power needed
• Cooler
• Achieves full brightness instantly
• No mercury
• Lasts longer

I'm waiting for LED lights to be available for homes!
It seems that LED screens are more environmentally friendly, but the liquid crystals used in LCDs are toxic. I wonder if Apple is planning to replace them?

A new type of screen, OLED, is different from these 2. In OLED screens, only the light needed is produced - there is no filtering. OLED screens are even thinner, use less power, have wider viewing angles and better contrast ratios. They can also be made flexible. The reason they're not being used for TVs and monitors yet is their lifetimes are too short.