Patent ID: 7948582

Claim:
A liquid crystal display device comprising: a first panel including a first substrate, a second substrate facing the first substrate, and a first liquid crystal layer driven by a horizontal electric field between the first and second substrates; a first electrode group having a common electrode and a pixel electrode which are parallel and formed on the upper part of the first substrate to selectively apply the horizontal electric field; second panel including a third substrate arranged facing the second substrate and a second liquid crystal layer driven by a vertical electric field between the second and third substrates; and a second electrode group having a first electrode formed on the upper part of the second substrate and a second electrode formed on the lower part of the third substrate to selectively apply the vertical electric field; and wherein the second liquid crystal layer is aligned to have identical direction of alignment direction of the first liquid crystal layer in initial alignment condition, and wherein when the vertical electric field is applied, a tilt angle of the second liquid layer is from 10° to 80°, a driving voltage for generating the vertical electric field is from 1V to 4V, and a cell gap of the second panel is 4 μm such that a phase delay range of the light passing the second layer is from 15 nm to 140 nm or wherein, when the vertical electric field is applied, a tilt angle of the second liquid layer is from 10° to 80°, a driving voltage for generating the vertical electric field is from 1V to 4V, and the cell gap of the second panel is 3.4 μm, such that a phase delay range of the light passing the second layer is from 14 nm to 120 nm.