A10-OLinuXino-LIME 4.3 LCD backlight PWM control working

Started by pharscape, August 24, 2014, 06:47:29 pm

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pharscape

August 24, 2014, 06:47:29 pm Last Edit: August 25, 2014, 12:40:13 pm by pharscape
Hi,

The LIME is certainly a lot of fun, I'm working on a project that needs backlight control for 4.3" LCD and now have a solution that works reliably. The result is very good with no flickering at low levels ( which is a problem with a cheap tablet I use).


You need the pwm-sunxi driver to be available and possibly you also have to modify the LCD driver to disable its control of the backlight - the driver isn't doing anything with it as far as I can see.

For more details and some analysis of the backlight circuit have a look here:
http://pharscape.org/techblog/olimex-4-3-lcd-a13-lcd43ts-pwm-backlight-control/

Cheers,
Paul