Liquid crystal display with two optical compensation units

A liquid crystal display device comprising:

• a drive liquid crystal cell having a pair of substrates disposed to face each other with a predetermined gap therebetween, and a liquid crystal layer disposed between the pair of substrates, wherein each substrate has an electrode on one surface thereof and liquid crystal molecules of the liquid crystal layer are controlled by a voltage applied between the electrodes;
• a pair of polarizers disposed outside of said drive liquid crystal cell;
• and
• an optical compensation unit disposed between said drive liquid crystal cell and one of the pair of polarizers;
• wherein said optical compensation unit comprises a left-twist liquid crystal layer of liquid crystal molecules having a chirality in a left-twist direction and a right-twist liquid crystal layer of liquid crystal molecules having a chirality in a right-twist direction;
• wherein:
• dr/Pr=dl/Pl, where Pr is a chiral patch and dris a thickness, respectively, of the right-twist liquid crystal layer, and Pl, is a chiral pitch and dl is a thickness, respectively, of the left-twist liquid crystal layer;
• wherein Δnh·dh≅Δnr·dr=Δnl, and dr/pr=dl/pl>0.5, where Δnh, Δnl and Δnr are values of refractive index anisotropies, respectively, of said drive liquid crystal cell, said left-twist liquid crystal layer and said right-twist liquid crystal layer, and dh is a thickness of said drive liquid crystal cell.