Cold Cathode Fluorescent Lamp (CCFL)--LCD Backlight
The CCFL(Cold Cathode Fluorescent Lamp) is a light source classified as an electronic
component. The CCFL in simplest terms is a gas-discharge light source, which produces its
output from a stimulated phosphor coating inside the glass lamp envelope. A CCFL can be
described as a transducer converting electrical energy into light energy.
Backlight Reflector is sputter-coated Ag on polyester film with outstanding optical,
mechanical and thermal properties. The CCFL Lamp is mount in side a reflector. Each
Reflector can installed 1-3 CCFL Lamps. There usually two reflector are used on TFT Panel (
Note, Most of Notebook screen only used one Reflector with one CCFL Lamps) which
mounted on the top and bottom of TFT Panel Module( See Below Photo)
How to select the LCD Backlight:
Unfortunately, there is no standard length of LCD Backlight (CCFL lamp) on each size of LCD
Panels. For Example, 15 inch panel could use the length of CCFL between 297mm to 325mm,
First, you need to measure your old lamps ( We had provide you three different method to
measure the CCFL lamp below), Then You need to get as close as your can base on your
measurement. There would be no difference if you select the length is about 2-8mm shorter
then your measurement. For Example: your measurement is 320mm, you should select
316mm and it will not affecting LCD panel's Brightness and Contrast at all. Besides, 316mm
will fit in the reflector and if you select longer then 320mm, you will have problem to install
new lamp in side the reflector. Please Visit our CCFL Lamp Cross Reference Table for more
How to Measure the Length of LCD Backlight
Active area Measurement for Laptop Screen:
It is not a good idea to pull your old lamp out from your laptop screen, measure it and wait
for new lamp to arrive. So we had developed a very effective method by measuring the active
area of screen, horizontally as shown on photo below. Then you can do that all at once.
Measure the active area width (View Area) from left to right (Horizontally), Add/Deduct
between 1-3mm bases on our part number:
If your measurement is 278mm for 13.3 inch laptop screen; you should use 275mm (Our
If your measurement is 308mm for 15 inch laptop screen, You should used 305mm ( Our
The rule of thumb would be always select a slightly shorter the your original lamp based on
our part number.
Note: This method is base on CCFL is mounted either on the top or bottom (Horizontally)
which is 99% of laptop screen Backlight lamp are mounted, However, some of 13.3” screen’s
Backlight were mounted vertically, Then you need to measure active area from top to bottom.
This is the best way to get the closed length of lamp possible.
Carefully remove CCFL from Backlight reflector, Slowly pull out rubber cap as show on
photo below. Measure the length of CCFL lamp, Selected the length slightly shorter then
your measurement base on our part number.
For Example: Your old lamp measurement is 320mm, You should use the length of 316mm
LCD Backlight (CCFL Lamps) are hold on inside of Reflector as picture shown at below. There
are Silicone Rubber Cap on both ends of CCFL Lamps. The measurement should be from
glass to glass( Shown on Photo below) plus the length of one of Silicon Rubber Cap.
For Example: The measurement from glass to glass is 310mm, your Rubber Cap
measurement is 5mm (Only Measure one of cap), Then you correct length should be should
plus 4-5mm each end. Let use 5mm for example. So, the correct length should be
315mm+5mm = 320mm. Selected the length slightly shorter then your measurement base on
our part number.
Please click the picture to enlarge
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