Electronics > Projects, Designs, and Technical Stuff
What type of backlight is this?
Eth7an:
I pulled this out of a cheap old monitor. I originally thought it would be easy to use this backlight as a task light, as I am lighting my workshop with a 55" led backlight from an old TV, and its amazing. This backlight is almost certainly high voltage, as I can see the wires going to it are directly connected across the output of two HV transformers on the top side of the power supply. The backlight panel itself is a piece of thick plastic or glass with a grid pattern on one side. This is not connected with any wires, and just sits between the edges of the housing, which is where the wires go.
If anyone knows what type of backlight this is, or more information on it, that would be awesome!
oPossum:
CCFL (Cold Cathode Fluorescent Lamp)
If you remove the diffuser from the frame, there will be 4 CCFL tubes along the edges.
Zero999:
Yes, CCFL backlit displays tend to have better colour rendering, but use more power than LED backlit ones, although more modern LEDs are just as good.
Efficiency wise, a CCFL is not as good a modern fluorescent lamp with a high efficiency electronic ballast.
Eth7an:
Oh, wow. Thanks a lot! What is the easiest way I can drive them? I have connected the power supply to it and it does nothing, presumably because it needs a power on signal. I guess I'm going to have to probe around and see what the power on does. Any ideas what voltage the signal to start up would be?
james_s:
It's probably a logic level signal. You can also buy generic CCFL inverters for a few dollars from China that work fine.
Do be careful, the output can be 1kV or more, it's not likely to kill you but it hurts if you touch it and you can get an RF burn which is particularly painful. The tubes are also very thin and extremely fragile so handle them very carefully if you remove the from the frame.
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