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P+ driving a recycled junked laptop LCD


alex
  • Alex salvages an old laptop display and manages to use the LVDS output of the Papilio Plus to drive it!

I had a broken laptop that was given to me and after it sat there gathering dust for a long time I decided to take the LCD apart since I had nothing to lose if nothing came of it. Once I exposed the LCD panel, I was pleasantly surprised to find a datasheet online with electrical, timing specs, even a pinout for the LCD panel, a QD15TL02 type which is a 15" panel with 1280x800 pixel native resolution.

The panel requires about 10V (5W) for the CCFL inverter and 3.3V (1.4W) for the logic, you can see below a 3.3V linear regulator I found in my junkbox bolted to a heatsink which I'm using currently do bring up the LCD panel. Additionally the panel is driven with four LVDS differential pairs, three for data and one for clock.

kdnwpc.jpg

Currently I have all the signals soldered to a small perfboard with a header that plugs into wing slots BH and AL. The reason I chose these slots is because I need differential signal pins and no single wing alone provides these.

Eventually I plan to make a small circuit board with a switch mode regulator that will fit in the corner seen in the picture above (the three screw holes). The PCB will have a barrel connector for power, a small pot for adjusting the brightness and a HDMI connector for the signals. Below is an eagle board I submitted to Batchpcb the other day. The LCD panel is not HDMI capable but the HDMI connector is ubiquitous and ideally suited for passing the high frequency data signals required.

29pok0w.jpg

On the right hand side above is a Pap wing with an HDMI connector which I plan to use to connect to the LCD panel but by reprogramming the FPGA to talk TMDS, that wing should be able to be used with any proper HDMI sink. I can't wait to use that wing to try out Mike's Dvid_test on my HDMI monitor.

The ground planes in the picture above have not been rendered for clarity. I've already received the components from Digikey (in less than 2 days no less) but Batchpcb has been having issues for the last few days and I only just today managed to buy my design, now a few weeks waiting for boards to turn up :(

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