Please don't ask which one is better, LCD or LED screen, because this is not a concept at all!

Here I want to focus on popular science. These are completely two concepts!

For a long time, many people have been asking when buying laptops or monitors: Which is better, LCD screen or LED screen?

Here I want to focus on popular science. These are completely two concepts!

Here I want to focus on popular science. These are completely two concepts!

LCD, full name Liquid Crystal Display, is a general term.

The operating principle of the LCD can be summarized as using an external electric field to change the arrangement of the liquid crystal material in the LCD panel, thereby affecting the amount of light passing through the polarizer and filter to change the actual brightness and color. The light mentioned here is also the interface Let's talk about the backlight module.

LCD panels (TN panels, VA panels, IPS panels, etc.) cannot emit light by themselves, so they need something to illuminate them. This thing is called a backlight.

There are many types of backlights, but the one we see most now is LED backlight. Before 2010, the mainstream of civilian displays was CCFL (Cold cathode fluorescent lamp), which is translated into Chinese as cold electrode fluorescent lamp. fluorescent tube! ! !

LED backlight

The full name of what we usually call "LED screen" is LED-backlit LCD. Do you see the big LCD at the back? Translated into Chinese is LED backlit LCD. What we call LED also refers to its backlight. At present, mainstream civilian-level displays (including notebook displays) basically use LED backlights, and CCFL-backlit displays are almost extinct.

CCFL Backlight

The CCFL displays we used before used fluorescent tubes as backlights. Due to the maturity of LED backlight technology, CCFL backlights, which are larger than LED backlights in terms of power consumption, thickness, weight and heat generation, will gradually be eliminated.

As for the latest OLED, Organic Light-Emitting Diode, the Chinese full name is organic light-emitting diode, which is a new display technology. OLED screens are self-luminous screens and do not require backlighting, which is essentially different from LCD screens.