What is LCD screen backlight?

LCD screen 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 produce light and must rely on a backlight to display images. Backlights usually consist of white LED lights that are mounted on the edge or back of the LCD screen.

Type of backlight

LCD backlights are mainly divided into two types: CCFL and LED. CCFL is a cold cathode fluorescent lamp, which is a long tube-shaped light bulb that requires a high-voltage inverter to convert low voltage to high voltage to light the bulb. LED backlights use LED chips as light sources. Compared with CCFL, LED backlights are more energy efficient, have longer life, and can provide better control of brightness and color.

How to light the backlight

LCD backlights can be lit in two ways: edge lighting and full array lighting. Edge lighting refers to installing LED lights on the edges of the LCD screen and using reflectors 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 size of the current and thus the brightness. PWM is a technology that controls the size of the current by changing the duty cycle of the signal. In CCFL backlights, an inverter is used to control the current and thus the brightness.

Summarize

The LCD backlight is an essential component for the LCD screen to display images and text. Backlights are mainly divided into two types: CCFL and LED. LED backlights are more energy-saving, have longer lifespan, and have better brightness and color control. The backlight can be lit in two ways: edge lighting and full array lighting, while brightness control can be achieved through PWM technology and an inverter.

Eurotech is a worldwide supplier and exporter of electronic components, specializing in ICs, LCDs, Memory, Chips, computer parts, networking equipments and other passive components.

Tel: (86) 755 8395 9469

E-mail: info@eurotech-ic.com