LCD contrast is very subjective based on ambient light, viewing angle,
and user-preference. If you are going to provide adjustable contrast why
not just use a pot?

   - Tom

At 08:27 AM 12/9/97 -0500, you wrote:
>Thomas M¿rch wrote:
>> 
>> Or make a PWM to control the contrast, then it's all 'computerized'
>> I have been thinking about making a lcd display i2c compatible with a pic,
>> just for fun and to keep myself occupied with something.. And make the
>> contrast/brightness (i've got some lcd's with backlight) controlable from
>> the i2c....
>> 
>
>
>OK, I give.  
>
>I just ordered a DS1669 (PIC controllable pot) to adjust the contrast on
>an LCD panel under PIC control.  I'm always interested in reducing the
>parts count.  How would I adjust the contrast using PWM?
>
>Jim
>jdolson@iserv.net
>
>