What are the sources of LED backlights?
Jul 17, 2018
What are the light sources of the LED backlight? In the planning of the backlight, the choice of the light source used is very important. The light source used determines the photoelectric parameters such as power consumption, brightness, color, etc. of the backlight, and also determines the operating conditions and service life characteristics. The following table shows the light sources that can be used for LCD backlights and their features:
Light source shape Light source type Color Power consumption (W) (Watt) Lifetime (h) (hours) Features
Point light source Lamp (bulb) 2800K or so 1.0 or more 2,000 Simple, small, low price Large size, hot and severe
LED (Light Emitting Diode) Blue ~ Red 430~700nm 0.038 or more 100,000 Long life, low heat, low brightness
Linear light source CCFL (cold cathode fluorescent tube) Red, green, blue and their mixed colors 1.0~10.0 25,000 High brightness and long life The inverter drive voltage is high
HCFL (hot cathode fluorescent tube) 4.0~220 5~7,000
Surface light source VFD (flat fluorescent lamp) 200mW/cm2 or less 5,000 High brightness and uniformity Dual power supply
EL (electroluminescent sheet) 20mW/cm2 or less 5,000 Thin, uniform, short life, low brightness
OELD (Organic Electroluminescent Sheet) 1,000 or more Thin, uniform, high brightness, short life
FED (flat field emission) 10,000 or more Brightness Under development
