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PWM LCD Contrast Adjustment digital interface

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Published on Aug 9, 2011

Link to page: http://pcbheaven.com/circuitpages/PWM...

The HD44780 is a very popular Character LCD Controller very widely used. The backlit of such LCDs is usually implemented with LEDs, so a simple PWM driver can directly adjust the brightness. Unfortunately, the PWM module cannot be directly used to adjust the contrast. So, i made a very simple and small circuit to interface the PWM output of a microcontroller to the contrast adjustment pin of the HD44780 Character LCD.

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