Pietja made two LCD adapters for the Bus Pirate v4:
First a cheap, fast, bi-directional passive adapter. The second adapter is an update on the existing BPv3 adapter with PWM or manual control for the backlight and contrast. On both adapters the BP can sense the contrast voltage, there are solder jumpers to select the supply voltage to the LCD and solder jumpers to swap the backlight pins.
Get your own handy Bus Pirate for $30, including world-wide shipping. Also available from our friendly distributors.