What are the light sources of the LED backlight? In the planning of the backlight, the selection of the light source used is very important. The light source used determines the power consumption, brightness, color and other photoelectric parameters of the backlight, as well as its operating conditions and operating life characteristics. The following table is a brief comparison of light sources and their characteristics that can be used for LCD backlights:

Light source shape Light source type Color Power consumption (W) (Watts) Life (h) (hours) Features

Point light source Lamp (bulb) about 2800K 1.0 or more 2,000 Simple, small, low price Large size, severe heat generation

LED (Light Emitting Diode) Blue~Red 430~700nm 0.038 or more 100,000 Long life, low heat generation, slightly lower brightness

Linear light source CCFL (Cold Cathode Fluorescent Tube) Red, Green, Blue and their mixed colors 1.0~10.0 25,000 High brightness, long life, High inverter drive voltage

HCFL (Hot Cathode Fluorescent Tube) 4.0~220 5~7,000 Severe heat generation

Planar light source VFD (flat fluorescent lamp) 200mW/cm2 or less 5,000 High brightness and good uniformity Dual power supply drive

EL (Electroluminescence Sheet) 20mW/cm2 or less 5,000 Thin, good uniformity, short life, low brightness

OELD (Organic Electroluminescence Sheet) 1,000 or more Thin, good uniformity, high brightness, short life

FED (Flat Field Emission) 10,000 or more High brightness Under development