| 摘要 |
PROBLEM TO BE SOLVED: To stably, efficiently and continuously produce a phase difference sheet capable of highly compensating changes of display characteristic due to visual angle in accordance with double refractivity of a liquid crystal display cell and forming a liquid crystal display device which is excellent in visibility of contrast, etc., in the broad range of visual angle. SOLUTION: In this phase difference sheet, the formula (nx+ny)/2<nz is satisfied, when nx, ny are the main refractive index in a surface and nz is the main refractive index in the thickness direction, and the azimuth of advance phase axis or lagging phase axis which has one side in a vertical or transverse direction as a standard is in the range of 0±5 deg. or 90±5 deg.. Heat shrinkable films are stuck on one side or both sides of a thermoplastic resin film in such a manner that the maximum heat shrinking direction forms a cross angle in the range within of 90±5 deg. with respect to the width direction or the length direction of the thermoplastic film. By subjecting the thermoplastic film to the action of heat shrinkage force more than 0.03 kg/mm2 by means of the heat shrinking film, the thermoplastic film is shrunk and the phase difference sheet is produced. |
