Inverter ICs for (5v DC -> 5v AC) and (9v DC -> 9v AC)
Liquid crystals take very little power to drive, so you don't need a special power circuit for them.  The output of a ordinary digital CMOS logic gate will be fine.  Some CMOS families can go up to 15 V, so 9 V is doable.  OPAMPS can also do this.

You can even create up to 10 V drive level with two 5 V logic outputs run 180&deg; out of phase.  With a setup like that, it would be possible to smoothly adjust the effective drive level by changing the phase between two square waves.  0&deg; would be no drive, 180&deg; full 10 V drive, and other phase shifts result in in-between levels.