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Nigel Goodwin said:Easy answer! - DON'T use a controllerless LCD, it's far too much work for too little gain.
But to get -19V it would be easiest to get it from the transformer if it's a mains project, for a battery project either an inverter and transformer, or inverter and voltage multiplier (assuming current requirements are low).
Depending on the PIC, you may even be able to use it's PWM module to generate a suitable voltage, check how the PICKit1 generates Vpp.