In this work, we have investigated the liquid crystal (LC) aligning capabilities and the electro-optical (EO) characteristics for the photo-aligned twisted nematic (TIN) cell with linearly polarized UV exposure of normal direction on the PMCh (poly (4'-methacryloyloxy chalcone)) surfaces using a new photo-alignment method. Good thermal stabilities of synthesized PMCh were obtained by TGA (Thermogravimetric Analysis) measurement. The excellent voltage transmittance (V-T) curve of the photo-aligned TN-LCD with UV exposure on the PMCh surface for I min using a new photodimerization method was observed. The voltage holding ratio (VHR) of the photo-aligned TN-LCD with photodimerized on the PMCh surface using a new photodimerization method was higher than that of a conventional photo-dimerization method. Consequently, a good LC aligning capabilities using a new photo-alignment method can be achieved.