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That's because PNP transistor requires different signal than NPN - NPN with zero signal on the base will cut the current and PNP will cut the current with the high setting. That's why LCD was not dimmed but was brightened to the max. To make it work with a PNP transistor you would need to change the code to dimm LCD with the "high" voltage.
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Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
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