lcd contrast help

Is it possible to control the contrast of an lcd by pwm? I guess it needs a constant voltage which is which a pot is used, but can I put a capacitor of a decent size on the pwm out to create a constant voltage? Any reason why this may be bad?

Is it possible to control the contrast of an lcd by pwm?

The answer is yes, at least as far as my search results indicate. Maybe you should try a different search engine.

My question is 'why would you want to do this'? The contrast voltage is generally a set and forget adjustment until you change displays.

Don

Just thinking about the ability to change contrast on the fly, not much practical use but for the sake of knowing thanks, I tried it and it works, no puffs of smoke either, just wanted to see if it was a bad idea

not much practical use but for the sake of knowing

That's a very good reason. Search around for some ideas, the question has come up before.

Don