PHASE DIFFERENCE FILM AND MANUFACTURE THEREOF
PROBLEM TO BE SOLVED: To provide a phase difference film of large width having optical performance applicable of a large-sized liquid crystal display device and capable of taking multiple pieces, and to be advantageous in cost. SOLUTION: This phase difference film formed by drawing a thermoplastic r...
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Zusammenfassung: | PROBLEM TO BE SOLVED: To provide a phase difference film of large width having optical performance applicable of a large-sized liquid crystal display device and capable of taking multiple pieces, and to be advantageous in cost. SOLUTION: This phase difference film formed by drawing a thermoplastic resin film has shift of a retardation phase axis to the drawing direction in the cross direction within ±0.7 degree, and/or its dispersion of retardation in the width direction is 10 nm or less and the film width is 700 mm or more. This manufacturing method includes a drawing process of drawing at a temperature set higher than drawing temperature by 2 deg.C or more where the difference between the maximum value and the minimum value of retardation in the width direction of the phase difference film is minimum. |
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