Patent ID: 7570336

Claim:
A display device comprising: a plurality of gate lines and a plurality of data lines crossing each other on a substrate to define a pixel region; a thin film transistor at each crossing portion of the gate lines and data lines; a pixel electrode about a circumference of the pixel region and having an opening at a central portion of the pixel region, the pixel electrode electrically connected to the thin film transistor; a piezoelectric lead lanthanum zirconate titanates (PLZT) layer in the opening of the pixel region, wherein a birefringence characteristic of the PLZT layer varies with a voltage applied to the pixel electrode; a piezoelectric lead zirconate titanates (PZT) layer between the pixel electrode and the PLZT layer, wherein when the voltage applied to the pixel electrode is transmitted to the PZT layer, a physical pressure generates in the PZT layer and transmits to the PLZT layer; and a protective film on a second side of the substrate including a color filter layer and a black matrix layer.