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High speed LCD backlight modulation and sync
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High speed LCD backlight modulation and sync

by llamero on Wed Oct 02, 2019 4:24 am

To help out anyone else who may need to do high-speed monitor modulation, or sync the backlight of a monitor to a peripheral device, I just tested the Qualia bare driver from Adafruit driving the LG LP097QX1 - iPad 3/4 Retina Display, and it worked exceptionally well:
Driver board: https://www.adafruit.com/product/1716
Monitor: https://www.adafruit.com/product/1751

There are a pair of nice through-holes in the driver board to allow you to attach your own external PWM (see photo - http://bit.ly/2pdsJYp). I then measured the on and off slew rates of the LCD backlight using a photomultiplier tube and found both to be well under a microsecond:
Backlight rise time (ns): http://bit.ly/2ovcgyj
Backlight fall time (ns): http://bit.ly/2onTJnO
Original test scan (25 ns pixels): http://bit.ly/2p7GoQG

If you have any questions, please feel free to ask.

llamero
 
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Please be positive and constructive with your questions and comments.