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Is it possible? TFT Panel Question.

Hi group,

New to this newsgroup, so I hope I've picked the right place to ask this question! If not, plese spin me around and point me in the right general direction and I'll trundle off that way. :-)

I have a rather odd request. I'm trying to build a driver circuit for a TFT panel I pulled from a laptop, just to see if I can.

The video signal requires 3.3 volts on each channel (R,G,B). No problem. A simple matter of building a l'il circuit to step down from the supply voltage to 3.3 volts. But, the backlight requires 1300 volts, which is meant to be provided by an invertor. Now, my electronics knowledge is very very rusty, but to me, an invertor would be something that flips a signal:

Before:

__|¯¯¯|__

After:

¯¯|___|¯¯

As I don't have the invertor, I need to build something to replace it. The original invertor would've originally been powered by a 11 volt battery, which would obviously be DC, so I don't see how it could "invert".

Anyone got any suggestions?

There's a spec sheet here:

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Cheers, Dave

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Reply to
David Baxter
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Not an inverter that changes state like you described but one that drives CCFT by stepping up to the required voltage. The initial power on is much higher than the steady on voltage. There are some electronic sources that can sell inverter board that can be driven off

12v. 
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Reply to
Impmon

Can't you extract the inverter from the laptop? Sometimes it's a little PCB on it's own.

Reply to
CWatters

The video signal requires 3.3 volts on each channel (R,G,B). No problem.

I don't want to dampen your enthusiasm, but, if the datasheet is for this panel, you do realise that this is a 'Panel Link' sort of panel - the data is sent using multiple differential LVDS channels. You will need to generate signals at (IIRC) 7 times pixel clock, ie 460 MHz. There are chips that do this but a fair bit of work is involved ...

Compared to this, the backlight is easy ! You could always remove the backlight assembly, and put a bright light behind...

Dave

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Reply to
Dave Garnett

TFT panels changed to using LVDS around the 800x600 generation - you can often find 800x600 panels with simpler logic interfaces, or lvds ones with an easily identifiable lvds receiver chip you can either remove or drive with the corresponding transmitter chip.

For an easy,cheap source of CCFL inverters look at PC neon case lights

Reply to
Mike Harrison

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