We developed new cross-liker for the PDLC application that includes the bisphenol A and tris(hydroxyphenyl)ethane moieties in the structure with bis- or tris-acrylate at the end of molecules to induce photo-polymerization. Although the cross-linker was added as small as 2% similar to 10% (more ratio) to compare with monomer, the electro-optic properties of PDLCs were found to exhibit significant change with material selection. We found that the more cross-linker added, the droplet size of LC became small which affected the properties of PDLC devices such as response time and driving voltage, directly. We found that tri-functionalized cross-linker synthesized from tris(hydroxyphenyl)ethane moiety could enhance the electro-optic property in PDLC. Also, in the PDLCs containing smaller size of liquid crystal droplets, although the response time and driving voltage were increased, the contrast ratio was enhanced, significantly.