To answer this question, we first need to understand the difference between LCD and LED. An LCD display consists of two panels separated by a uniform layer of liquid crystal material.
Since liquid crystal material itself does not emit light, a backlight tube is placed beneath the display to act as a light source. Behind the LCD screen is a backlight panel (or light distribution panel) and a reflective film. The backlight panel is composed of fluorescent material and emits light, its main function being to provide a uniform backlight. The light emitted from the backlight enters the liquid crystal layer after passing through the first polarizing filter layer.
When an electric field is generated by the electrodes in the LCD, the liquid crystal molecules twist, causing the light passing through them to be refracted in a regular pattern. This refracted light then passes through the second filter layer and is displayed on the screen.
From the structure and working principle of LCD displays, we can see that LCD displays require a backlight. Currently, there are two types of backlights on the market: one is a CCFL (CC Fluorescent Lamp), and the other is a light-emitting diode (LED). Industry professionals refer to LCD screens with CCFL backlights as LCD displays, and those with LED backlights as LED displays.
So whether it's LCD or LED, they are essentially the same thing, both being liquid crystal displays. The main structural difference between the two is the backlight.