A major limitation of acousto-optic (AO) modulator-based holographic displays is their inability to present full-parallax. We propose that full-parallax capabilities can be added to these displays by integrating electro-optic (EO) modulators into the architecture. We validated this concept by rendering computational models and by fabricating and testing EO deflection devices in lithium niobate. Our models suggest that an AO/EO modulator that yields an EO deflection range of 18.2° using less than 5 V can be fabricated given the limitations of standard photolithography and lithium niobate waveguides. Actual deflection ranges were measured from our fabricated devices and were compared to those that were derived from our model. In the worst case, the experimental results differed by about 16% compared to the corresponding theoretical result. In the best case, the error was smaller than our measurement tolerances. The work we have performed sets the stage for the first instance of an integrated electro-optic/acousto-optic modulator for holographic displays.