What is LCD backlight?

LCD liquid crystal backlight refers to a light source added behind the LCD screen to illuminate the screen so that it can display images and text. The LCD screen itself cannot generate light and must rely on the backlight to display images. The backlight usually consists of white LED lights mounted on the edge or back of the LCD screen.

Type of backlight

There are two main types of LCD backlights: CCFL and LED. CCFL is Cold Cathode Fluorescent Lamp, which is a long tubular light bulb that requires a high voltage inverter to convert the low voltage to high voltage to light the bulb. LED backlights use LED chips as light sources. Compared to CCFLs, LED backlights are more energy efficient, last longer, and allow for better control over brightness and color.

How to turn on the backlight

LCD backlighting can be lit in two ways: edge lighting and full array lighting. Edge lighting refers to installing LED lights on the edge of the LCD screen and using a reflector to guide the light to the center of the screen. Full array lighting distributes LED lights evenly behind the entire screen, making the brightness of the entire screen more uniform.

How to control the brightness of the backlight

The brightness of the backlight can be adjusted by controlling the current. In LED backlights, PWM (Pulse Width Modulation) technology is used to control the magnitude of the current, thereby controlling the brightness. PWM is a technology that controls the magnitude of the current by changing the duty cycle of the signal. In a CCFL backlight, an inverter is used to control the magnitude of the current, thereby controlling the brightness.

Summarize

The LCD backlight is an essential part of the LCD screen displaying images and text. Backlights are mainly divided into two types: CCFL and LED. LED backlights are more energy-efficient, have a longer life, and better control of brightness and color. The backlight can be lit by two ways of edge lighting and full array lighting, while controlling the brightness can be realized by PWM technology and inverter.

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