IPS LCD having molecules remained parallel with electric fields applied

A liquid crystal display device with an in-plane switching mode, comprising:

• a first substrate having a first electrode and a second electrode formed thereon, the first electrode being arranged parallel to the second electrode, a first electric field being generated between the first electrode and the second electrode when a voltage is applied to the first and second electrodes;
• a second substrate having a third electrode and a fourth electrode formed thereon and disposed opposite to the first substrate, the third electrode being arranged parallel to the fourth electrode, a second electric field being generated between the third and fourth electrodes when the voltage is applied, the direction of the second electric field being substantially orthogonal to that of the first electric field;
• a polarizer arranged on an outside of the first substrate;
• an analyzer arranged on an outside of the second substrate;
• a first homogenous alignment film applied to the first substrate;
• a second homogeneous alignment film applied to the second substrate;
• and
• a liquid crystal layer having liquid crystal molecules interposed between the first and second substrates such that, in an absence of said first and second electric fields, the liquid crystal molecules are arranged homogeneously with the first and second homogeneous alignment films and, in a presence of the first and second electric fields, major axes of said liquid crystal molecules adjacent to the first and second substrate are parallel to the first and second electric fields, respectively, and wherein said liquid crystal molecules are twisted relative to each other while remaining parallel to said first and second substrates in the presence of said first and second electric fields.

A liquid crystal display device with an in-plane switching mode, comprising:

• a first substrate having a first pixel electrode and a first counter electrode formed thereon, the first pixel electrode being arranged parallel to the first counter electrode, a first electric field being generated between the first pixel and counter electrodes when a voltage is applied to the first pixel and counter electrodes;
• a second substrate having a second pixel electrode and a second counter electrode formed thereon and disposed opposite to the first substrate, the second pixel electrode being arranged parallel to the second counter electrode, a second electric field being generated between the second pixel electrode and the second counter electrode when the voltage is applied to the second pixel and counter electrodes, the direction of the second electric field being substantially orthogonal to that of the first electric field;
• a polarizer arranged on an outside of the first substrate;
• an analyzer on an outside of the second substrate, a polarization axis of the analyzer being substantially orthogonal to a polarization axis of the polarizer;
• a first homogenous alignment film applied to the first substrate, an alignment direction of said first homogenous alignment film substantially coinciding with the polarization axis of said polarizer;
• a second homogeneous alignment film applied to the second substrate, said first and second homogenous alignment films being anti-parallel to each other and being rubbed in a direction of 45° relative to respective electrodes;
• and
• a liquid crystal layer having liquid crystal molecules interposed between the first substrate and the second substrates such that, in an absence of said first and second electric fields, the liquid crystal molecules are arranged homogeneously with the first and second homogeneous alignment films and, in a presence of the first and second electric fields, major axes of said liquid crystal molecules adjacent to the first and second substrates are parallel to the first and second electric fields, respectively, and wherein said liquid crystal molecules are twisted relative to each other while remaining parallel to said first and second substrates in the presence of said first and second electric fields so that the liquid crystal molecules substantially close to the first substrate deviate by an angle of about 45° from the polarization axis of the polarizer and liquid crystal molecules substantially close to the second substrate deviate by an angle of about 45° from the polarization axis of the analyzer.