An exemplary liquid crystal display device (2) includes: a first substrate (21) and a second substrate (22); a liquid crystal layer (23) having liquid crystal molecules located between the first and second substrates, the liquid crystal molecules are intermingled with chiral dopant, and are in a twist π cell state before the liquid crystal display device is turned on; and a plurality of pixel regions. Each of the pixel regions defines a reflection region and a transmission region, whereby a thickness of the liquid crystal layer in the reflection region is less than a thickness of the liquid crystal layer in the transmission region.