News
LCD backlight(CCFL) ----- Update on 2009-10-09
What is Backlighting?
Backlighting is a technique used to make LCD easier to read. A backlit display is illuminated so that the foreground appears sharper in contrast with the background.
There are three common backlight technologies for the LCD:
EL (Electroluminiscent Lamp)
LED (Light Emitting Diode)
CCFL (Cold Cathode Fluorescent Lamp)
What is CCFL (Cold Cathode Fluorescent Lamp)?
A: This type of light source is most common in graphics and color displays. It provides a uniform and bright white light. A common application that would use a CCFL backlight is a Laptop computer. Some other applications that use this type of backlight include, gas pumps, medical instruments, industrial PCs, etc.
The CCFL has a drawback that is similar to the EL backlight it also needs a DC-AC Inverter. Though not the same type as the EL, the CCFL inverter needs to generate more voltage than those used for the EL. A typical EL inverter outputs 120VAC @400Hz, whereas the CCFL Inverter needs to output 1000VAC @ 30kHz~40kHz.
Update on 10/09/2009
Backlighting is a technique used to make LCD easier to read. A backlit display is illuminated so that the foreground appears sharper in contrast with the background.
There are three common backlight technologies for the LCD:
EL (Electroluminiscent Lamp)
LED (Light Emitting Diode)
CCFL (Cold Cathode Fluorescent Lamp)
What is CCFL (Cold Cathode Fluorescent Lamp)?
A: This type of light source is most common in graphics and color displays. It provides a uniform and bright white light. A common application that would use a CCFL backlight is a Laptop computer. Some other applications that use this type of backlight include, gas pumps, medical instruments, industrial PCs, etc.
The CCFL has a drawback that is similar to the EL backlight it also needs a DC-AC Inverter. Though not the same type as the EL, the CCFL inverter needs to generate more voltage than those used for the EL. A typical EL inverter outputs 120VAC @400Hz, whereas the CCFL Inverter needs to output 1000VAC @ 30kHz~40kHz.
Update on 10/09/2009